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-- Script API Tests
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-- Test routines for the scripting API
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-- When adding new Lua APIs, tests for them should go here.

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require("logger")
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-- global logger
test_log = nil

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function printf(s,...)
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    test_log:writef(s,...)
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    if not console.visible then
        display.notify_box(s:format(...), 5000)
    end
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end

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function alert()
    display.off()
    beep()
    display.on()
end

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function request_mode(mode, mode_str)
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    if camera.mode ~= mode or not camera.gui.idle then
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        printf("Please switch to %s mode.\n", mode_str, mode)
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        while camera.mode ~= mode or not camera.gui.idle do
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            console.show(); assert(console.visible)
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            if camera.gui.idle then alert() end
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            sleep(1)
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        end
    end
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    sleep(2)
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end

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function round(x)
    -- https://scriptinghelpers.org/questions/4850/how-do-i-round-numbers-in-lua-answered
    return x + 0.5 - (x + 0.5) % 1
end

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function print_table(t)
    test_log:write(string.format("%s = ", t))
    local s,e = xpcall(function()
        test_log:serialize(_G[t])
    end, debug.traceback)
    if s == false then
        test_log:write(e)
    end
end

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-- used for testing Lua 'strict' mode
declared_var = nil

function strict_tests()
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    printf("Strict mode tests...\n")
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    -- this should work
    declared_var = 5
    assert(declared_var == 5)

    -- this should raise error
    local s,e = pcall(function() undeclared_var = 7 end)
    assert(s == false)
    assert(e:find("assign to undeclared variable 'undeclared_var'"))

    -- same here
    local s,e = pcall(function() print(undeclared_var) end)
    assert(s == false)
    assert(e:find("variable 'undeclared_var' is not declared"))

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    printf("Strict mode tests passed.\n")
    printf("\n")
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end

function generic_tests()
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    printf("Generic tests...\n")
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    print_table("arg")
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    print_table("camera")
    print_table("event")
    print_table("console")
    print_table("lv")
    print_table("lens")
    print_table("display")
    print_table("key")
    print_table("menu")
    print_table("movie")
    print_table("dryos")
    print_table("interval")
    print_table("battery")
    print_table("task")
    print_table("property")
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    printf("Generic tests completed.\n")
    printf("\n")
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end

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function stdio_test()
    local s,e
    
    -- these should print to console
    -- fixme: they should output this:
    -- Hello, stderr. Hello, stdout. 
    -- Hello again, stdout.
    -- Hello again, stderr.
    io.write("Hello, stdout. ")
    io.stderr:write("Hello, stderr. ")
    io.write("\n")

    io.write("Hello again, stdout.\n")
    io.stderr:write("Hello again, stderr.\n")

    -- not implemented
    -- I expected error, but...
    local inp = io.read("*line")
    print("From stdin:", inp)
end

function copy_test(src, dst)
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    printf("Copy test: %s -> %s\n", src, dst)
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    -- will this copy without errors? we'll see
    -- read source file
    local fin = io.open(src, "rb")
    local data = fin:read("*all")
    fin:close()

    -- save a copy
    local fout = io.open(dst, "w")
    fout:write(data)
    fout:close()

    -- verify
    fin = io.open(dst, "rb")
    local check = fin:read("*all")
    local size = fin:seek("end", 0)
    fin:close()
    assert(data == check)
    assert(size == #data)
    
    -- delete the copy
    assert(dryos.remove(dst) == true)
    
    -- check if it was deleted
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    assert(io.open(dst, "rb") == nil)
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    -- it should return false this time
    assert(dryos.remove(dst) == false)

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    printf("Copy test OK\n")
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end

function append_test(file)
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    printf("Append test: %s\n", file)
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    local data1 = "Allons enfants de la patrie\n"
    local data2 = "Le jour de gloire est arrivé !\n"
    
    -- make sure the file is not there
    dryos.remove(file)
    
    -- create it
    local fout = io.open(file, "a")
    fout:write(data1)
    fout:close()

    -- verify the contents
    local fin = io.open(file, "r")
    local check = fin:read("*all")
    fin:close()
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    assert(check == data1)
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    -- reopen it to append something
    fout = io.open(file, "a")
    fout:write(data2)
    fout:close()

    -- verify the contents
    fin = io.open(file, "r")
    check = fin:read("*all")
    fin:close()
    assert(check == data1 .. data2)

    -- delete it
    assert(dryos.remove(file) == true)
    
    -- check if it was deleted
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    assert(io.open(file, "rb") == nil)
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    printf("Append test OK\n")
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end

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function rename_test(src, dst)
    printf("Rename test: %s -> %s\n", src, dst)

    local data = "Millions saw the apple fall, " ..
        "but Newton was the one who asked why."
    
    -- create the source file
    local fout = io.open(src, "w")
    fout:write(data)
    fout:close()

    -- verify the contents
    local fin = io.open(src, "r")
    local check = fin:read("*all")
    fin:close()
    assert(check == data)

    -- rename it
    assert(dryos.rename(src, dst) == true)

    -- verify the contents
    fin = io.open(dst, "r")
    check = fin:read("*all")
    fin:close()
    assert(check == data)
    
    -- check if the source file was deleted
    assert(io.open(src, "rb") == nil)

    -- cleanup: delete the renamed file
    assert(dryos.remove(dst) == true)
    
    -- check if it was deleted
    assert(io.open(dst, "rb") == nil)

    printf("Rename test OK\n")
end

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function test_io()
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    printf("Testing file I/O...\n")
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    stdio_test()
    copy_test("autoexec.bin", "tmp.bin")
    append_test("tmp.txt")
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    rename_test("apple.txt", "banana.txt")
    rename_test("apple.txt", "ML/banana.txt")
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    printf("File I/O tests completed.\n")
    printf("\n")
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end

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function test_camera_gui()
    printf("Testing Canon GUI functions...\n")

    camera.gui.play = true
    assert(camera.gui.play == true)
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    assert(camera.gui.mode == 1)
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    -- half-shutter should exit playback mode
    key.press(KEY.HALFSHUTTER)
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    sleep(1)
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    assert(camera.gui.play == false)
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    assert(camera.gui.mode == 0)
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    key.press(KEY.UNPRESS_HALFSHUTTER)

    -- randomly switch between PLAY, MENU and IDLE (with or without LiveView)
    for i = 1,100 do
        -- we can request MENU or PLAY mode from anywhere
        -- we can only exit these modes if we are already there
        if math.random(1,2) == 1 then
            if math.random(1,2) == 1 then
                printf("Enter PLAY mode...\n");
                camera.gui.play = true
                assert(camera.gui.play == true)
                assert(camera.gui.menu == false)
                assert(camera.gui.idle == false)
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                assert(camera.gui.mode == 1)
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            elseif camera.gui.play then
                printf("Exit PLAY mode...\n");
                camera.gui.play = false
                assert(camera.gui.play == false)
                assert(camera.gui.menu == false)
                assert(camera.gui.idle == true)
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                assert(camera.gui.mode == 0)
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            end
        else
            if math.random(1,2) == 1 then
                printf("Enter MENU mode...\n");
                camera.gui.menu = true
                assert(camera.gui.menu == true)
                assert(camera.gui.play == false)
                assert(camera.gui.idle == false)
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                assert(camera.gui.mode == 2)
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            elseif camera.gui.menu then
                printf("Exit MENU mode...\n");
                camera.gui.menu = false
                assert(camera.gui.menu == false)
                assert(camera.gui.play == false)
                assert(camera.gui.idle == true)
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                assert(camera.gui.mode == 0)
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            end
        end

        -- also play around with LiveView
        if camera.gui.menu == false and camera.gui.play == false then
            if math.random(1,2) == 1 then
                -- do something with LiveView, but not as often as switching MENU/PLAY
                if not lv.enabled then
                    printf("Start LiveView...\n");
                    lv.start()
                elseif lv.paused then
                    printf("Resume LiveView...\n");
                    lv.resume()
                elseif math.random(1,10) < 9 then
                    -- this gets taken less often than the next one, why?
                    -- fixme: biased random?
                    printf("Pause LiveView...\n");
                    lv.pause()
                else
                    printf("Stop LiveView...\n");
                    lv.stop()
                end
            end
        end
    end

    lv.stop()
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    assert(not lv.enabled)
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    printf("Canon GUI tests completed.\n")
    printf("\n")
end

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function test_menu()
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    printf("Testing ML menu API...\n")
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    menu.open()
    assert(menu.select("Expo", "ISO"))

    -- menu values should be set-able as string (displayed value)
    -- or as integer (internal value)
    assert(menu.set("Expo", "ISO", "200"))
    assert(camera.iso.value == 200)
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    sleep(1)
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    -- int should be promoted to string because of custom logic in Expo->ISO menu
    assert(menu.set("Expo", "ISO", 1600))
    assert(camera.iso.value == 1600)
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    sleep(1)
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    -- move selection (not required for set to work; just for user interface)
    assert(menu.select("Expo", "Picture Style"))

    -- picture styles should be set-able as string
    -- numeric works too, as it sets the internal index
    assert(menu.set("Expo", "Picture Style", "Portrait"))
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    assert(menu.get("Expo", "Picture Style") == "Portrait")
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    sleep(1)
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    assert(menu.set("Expo", "Picture Style", 5)) -- OK, selects Neutral
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    -- skip string test, as other camera models may use different indices
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    sleep(1)
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    assert(menu.set("Expo", "Picture Style", "Landscape"))
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    assert(menu.get("Expo", "Picture Style") == "Landscape")
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    sleep(1)
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    assert(menu.set("Expo", "Picture Style", 1234) == false) -- should fail, out of range
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    assert(menu.get("Expo", "Picture Style") == "Landscape") -- old selection should not change
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    sleep(1)
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    assert(menu.select("Overlay"))
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    assert(menu.select("Movie"))

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    -- perform the next test in LiveView
    menu.close()
    lv.start()
    assert(lv.enabled)
    assert(lv.running)
    menu.open()

    assert(menu.select("Movie", "FPS override"))
    assert(menu.set("Movie", "FPS override", "OFF"))            -- "OFF" and "ON" are boolean matches for zero/nonzero internal state
    assert(menu.get("Movie", "FPS override") == "OFF")
    assert(menu.set("FPS override", "Desired FPS", "23.976"))   -- this menu entry will print "23.976 (from 25)" or something like that
    assert(menu.get("FPS override", "Desired FPS"):sub(1,13) == "23.976 (from ")
    assert(menu.set("FPS override", "Desired FPS", "5"))        -- this menu entry will print "5 (from 30)" or something like that
    assert(menu.get("FPS override", "Desired FPS"):sub(1,8) == "5 (from ")
    assert(menu.set("FPS override", "Desired FPS", "10"))       -- this menu entry will print "10 (from 25)" or something like that
    assert(menu.get("FPS override", "Desired FPS"):sub(1,9) == "10 (from ")
    assert(menu.set("FPS override", "Optimize for", "Exact FPS")) -- nothing fancy here, just request exact frame rate
    assert(menu.get("FPS override", "Optimize for") == "Exact FPS")
    assert(menu.set("Movie", "FPS override", "ON"))             -- enable FPS override
    assert(menu.get("Movie", "FPS override") ~= "ON")           -- the menu entry will print something else
    sleep(2)                                                    -- switching the frame rate takes a while
    assert(menu.get("Movie", "FPS override") == "10.000")       -- it should eventually settle to our requested value
    assert(menu.get("FPS override", "Actual FPS") == "10.000")  -- current FPS value can be read from here
    assert(menu.set("Movie", "FPS override", "OFF"))            -- that was it
    assert(menu.get("Movie", "FPS override") == "OFF")          -- make sure it's turned off

    -- LiveView test completed
    menu.close()
    lv.stop()
    assert(not lv.running)
    assert(not lv.enabled)
    menu.open()

    assert(menu.select("Shoot"))
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    assert(menu.select("Shoot", "Advanced Bracket"))

    -- boolean items should be set-able as int (0 or 1)
    assert(menu.set("Shoot", "Advanced Bracket", 1))
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    assert(menu.get("Shoot", "Advanced Bracket", 0) == 1)
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    sleep(1)
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    -- or as string (if the user interface displays "ON" or "OFF")
    -- here, actual string will be "ON, 10s" or similar (also accepted)
    assert(menu.set("Shoot", "Intervalometer", "ON"))
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    assert(menu.get("Shoot", "Intervalometer", 0) == 1)
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    sleep(1)
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    -- turning off should be straightforward
    assert(menu.set("Shoot", "Advanced Bracket", "OFF"))
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    assert(menu.get("Shoot", "Advanced Bracket", 0) == 0)
    assert(menu.get("Shoot", "Advanced Bracket") == "OFF")
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    sleep(1)
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    -- "ON" and "OFF" are interpreted as booleans,
    -- even if the menu entry doesn't display exactly this string
    assert(menu.set("Shoot", "Advanced Bracket", "ON"))
    assert(menu.get("Shoot", "Advanced Bracket") ~= "ON")
    assert(menu.get("Shoot", "Advanced Bracket") ~= "OFF")
    assert(menu.set("Shoot", "Advanced Bracket", "OFF"))
    assert(menu.get("Shoot", "Advanced Bracket") == "OFF")

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    assert(menu.set("Shoot", "Intervalometer", 0))
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    assert(menu.get("Shoot", "Intervalometer", 0) == 0)
    assert(menu.get("Shoot", "Intervalometer") == "OFF")
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    sleep(1)
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    -- move to Intervalometer menu
    assert(menu.select("Shoot", "Intervalometer"))
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    sleep(1)
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    -- enter the submenu
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    assert(menu.select("Intervalometer", "Take a pic every"))
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    sleep(1)
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    -- note: setting menu by string works by brute force
    -- that is, trying every possible value and comparing the string
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    assert(menu.set("Intervalometer", "Take a pic every", "1m10s"))
    assert(menu.get("Intervalometer", "Take a pic every", 0) == 70)
    assert(menu.get("Intervalometer", "Take a pic every") == "1m10s")

    -- going from 1m10s to 1m30s should be easy
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    assert(menu.set("Intervalometer", "Take a pic every", "1m30s"))
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    assert(menu.get("Intervalometer", "Take a pic every", 0) == 90)
    assert(menu.get("Intervalometer", "Take a pic every") == "1m30s")
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    -- going back to 1m10s would have to go through LOTS of intermediate values
    assert(menu.set("Intervalometer", "Take a pic every", "1m10s"))
    assert(menu.get("Intervalometer", "Take a pic every", 0) == 70)
    assert(menu.get("Intervalometer", "Take a pic every") == "1m10s")
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    sleep(1)
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    -- actual string will be 10s
    assert(menu.set("Intervalometer", "Take a pic every", "10"))
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    assert(menu.get("Intervalometer", "Take a pic every", 0) == 10)
    assert(menu.get("Intervalometer", "Take a pic every") == "10s")
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    sleep(1)
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    -- integer should work as well, as long as the internal state variable matches the menu value
    -- on other menus, where internal state is some index, integer argument may not be the best choice
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    assert(menu.set("Intervalometer", "Take a pic every", 70))
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    assert(menu.get("Intervalometer", "Take a pic every", 0) == 70)
    assert(menu.get("Intervalometer", "Take a pic every") == "1m10s")
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    sleep(1)
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    -- out of range, should fail
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    assert(menu.set("Intervalometer", "Take a pic every", 7000000) == false)
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    assert(menu.get("Intervalometer", "Take a pic every", 0) == 70)
    assert(menu.get("Intervalometer", "Take a pic every") == "1m10s")
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    sleep(1)
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    -- exit submenu
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    assert(menu.select("Shoot", "Intervalometer"))
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    sleep(1)
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    -- let's try some more submenus
    -- todo: more multi-level submenus
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    assert(menu.select("Advanced Bracket", "Frames")); sleep(1)
    assert(menu.select("Advanced Bracket", "Sequence")); sleep(1)
    assert(menu.select("Advanced Bracket", "ISO shifting")); sleep(1)
    assert(menu.select("Bulb Timer", "Exposure duration")); sleep(1)
    assert(menu.select("Shoot Preferences", "Snap Simulation")); sleep(1)
    assert(menu.select("Misc key settings", "Sticky HalfShutter")); sleep(1)
    assert(menu.select("Play mode actions", "Trigger key(s)")); sleep(1)
    assert(menu.select("LiveView zoom tweaks", "Zoom on HalfShutter")); sleep(1)
    assert(menu.select("Lens info", "Lens ID")); sleep(1)
    assert(menu.select("Shoot", "Intervalometer")); sleep(1)
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    -- selection in the Modified menu
    -- note: we have already modified "Take a pic every"
    -- so at least this setting should appear there
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    assert(menu.set("Shoot", "Intervalometer", "ON")); sleep(1)
    assert(menu.select("Modified", "Intervalometer")); sleep(1)             -- we should find Intervalometer in the Modified menu
    assert(menu.select("Modified", "Take a pic every")); sleep(1)           -- same for "Take pic every" (smaller font)
    assert(menu.select("Modified", "Intervalometer")); sleep(1)             -- scroll back to intervalometer
    assert(menu.set("Shoot", "Intervalometer", "OFF")); sleep(1)            -- turn it off
    assert(menu.select("Modified", "Take a pic every") == false); sleep(1)  -- now "Take a pic every" should disappear (submenus are only expanded when the main entry is on)
    assert(menu.set("Shoot", "Intervalometer", "ON")); sleep(1)             -- re-enable intervalometer
    assert(menu.select("Modified", "Take a pic every")); sleep(1)           -- now "Take a pic every" should re-appear
    assert(menu.set("Intervalometer", "Take a pic every", 10)); sleep(1)    -- set "Take a pic every" back to default
    assert(menu.select("Modified", "Intervalometer")); sleep(1)             -- scroll back to intervalometer
    assert(menu.set("Shoot", "Intervalometer", "OFF")); sleep(1)            -- turn it off
    assert(menu.select("Modified", "Take a pic every") == false); sleep(1)  -- now "Take a pic every" should disappear
    assert(menu.select("Shoot", "Intervalometer")); sleep(1)                -- move back to Shoot -> Intervalometer
    assert(menu.select("Intervalometer", "Take a pic every")); sleep(1)     -- set other intervalometer settings to default (just in case)
    assert(menu.select("Intervalometer", "Start trigger")); sleep(1)        -- the menu.select calls are just for visual effect
    assert(menu.set("Intervalometer", "Start trigger", "Leave Menu")); sleep(0.5);
    assert(menu.select("Intervalometer", "Start after")); sleep(0.5)
    assert(menu.set("Intervalometer", "Start after", "3s")); sleep(0.5);
    assert(menu.select("Intervalometer", "Stop after")); sleep(0.5)
    assert(menu.set("Intervalometer", "Stop after", "Disabled")); sleep(0.5);
    assert(menu.select("Shoot", "Intervalometer")); sleep(1)
    assert(menu.select("Modified", "Intervalometer") == false); sleep(1)    -- now Modified -> Intervalometer should disappear
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    -- non-existent menus; should fail
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    assert(menu.select("Dinosaur") == false)
    assert(menu.select("Shoot", "Crocodile") == false)

    -- menu.get/set return nil if the menu was not found
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    assert(menu.get("Shoot", "Introvolometer", 0) == nil)
    assert(menu.get("Shoot", "Brack") == nil)
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    assert(menu.set("Shoot", "Introvolometer", 1) == nil)
    assert(menu.set("Shoot", "Introvolometer", "OFF") == nil)
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    menu.close()

    -- exercise the menu backend a bit
    for i = 1,5 do
        menu.open()
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        assert(camera.gui.idle == false)
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        menu.close()
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        assert(camera.gui.idle == true)
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    end

    printf("Menu tests completed.\n")
    printf("\n")
end

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function taskA()
    printf("Task A started.\n")
    local i
    for i = 1,100 do
        printf("Task A: %d\n", i)
        task.yield(math.random(10,50))
    end
end

function taskB()
    printf("Task B started.\n")
    local i
    for i = 1,100 do
        printf("Task B: %d\n", i)
        task.yield(math.random(10,50))
    end
end

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function taskC()
    printf("Task C started.\n")
    msleep(math.random(10,50))
    printf("Task C finished.\n")
end

function taskD()
    io.write("Task D started.\n")
    msleep(math.random(10,50))
    io.write("Task D finished.\n")
end

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function test_multitasking()
    printf("Testing multitasking...\n")

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    -- FIXME: this fails
    --task.create(taskA)
    --task.create(taskB)
    --task.yield(5000)
    
    printf("Only one task allowed to interrupt...\n")

    -- small test with logging to file
    for i = 1,10 do
        task.create(taskC)
        printf("Main task yielding.\n")
        task.yield(math.random(10,50))
        printf("Main task back.\n")
    end

    -- larger test with logging to console only
    for i = 1,1000 do
        task.create(taskD)
        io.write("Main task yielding.\n")
        task.yield(math.random(10,50))
        io.write("Main task back.\n")
    end

    task.yield(500)
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    printf("Multitasking tests completed.\n")
    printf("\n")
end

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function test_keys()
    printf("Testing half-shutter...\n")
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    for i = 1,10 do
        -- open Canon menu
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        camera.gui.menu = true
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        sleep(1)
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        assert(camera.gui.menu == true)
        assert(camera.gui.idle == false)
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        key.press(KEY.HALFSHUTTER)
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        sleep(0.2)
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        if key.last ~= KEY.HALFSHUTTER then
            printf("warning: last key not half-shutter, but %d\n", key.last)
        end
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        sleep(1)
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        -- half-shutter should close Canon menu
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        assert(camera.gui.menu == false)
        assert(camera.gui.idle == true)
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        key.press(KEY.UNPRESS_HALFSHUTTER)
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        sleep(0.2)
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        if key.last ~= KEY.UNPRESS_HALFSHUTTER then
            printf("warning: last key not unpress half-shutter, but %d\n", key.last)
        end
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    end
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    printf("Half-shutter test OK.\n")
    
    -- todo: test other key codes? press/unpress events?
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    printf("\n")
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end

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function test_camera_exposure()
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    printf("Testing exposure settings...\n")
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    printf("Camera    : %s (%s) %s\n", camera.model, camera.model_short, camera.firmware)
    printf("Lens      : %s\n", lens.name)
    printf("Shoot mode: %s\n", camera.mode)
    printf("Shutter   : %s (raw %s, %ss, %sms, apex %s)\n", camera.shutter, camera.shutter.raw, camera.shutter.value, camera.shutter.ms, camera.shutter.apex)
    printf("Aperture  : %s (raw %s, f/%s, apex %s)\n", camera.aperture, camera.aperture.raw, camera.aperture.value, camera.aperture.apex)
    printf("Av range  : %s..%s (raw %s..%s, f/%s..f/%s, apex %s..%s)\n",
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        camera.aperture.min, camera.aperture.max,
        camera.aperture.min.raw, camera.aperture.max.raw,
        camera.aperture.min.value, camera.aperture.max.value,
        camera.aperture.min.apex, camera.aperture.max.apex
    )
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    printf("ISO       : %s (raw %s, %s, apex %s)\n", camera.iso, camera.iso.raw, camera.iso.value, camera.iso.apex)
    printf("EC        : %s (raw %s, %s EV)\n", camera.ec, camera.ec.raw, camera.ec.value)
    printf("Flash EC  : %s (raw %s, %s EV)\n", camera.flash_ec, camera.flash_ec.raw, camera.flash_ec.value)
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    request_mode(MODE.M, "M")
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    local old_value = camera.shutter.raw
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    printf("Setting shutter to random values...\n")
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    for k = 1,100 do
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        local method = math.random(1,4)
        local d = nil
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        if method == 1 then
            local s = math.random(1,30)
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            if math.random(1,2) == 1 then
                camera.shutter.value = s
            else
                camera.shutter = s
            end
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            d = math.abs(math.log(camera.shutter.value,2) - math.log(s,2))
        elseif method == 2 then
            local ms = math.random(1,30000)
            camera.shutter.ms = ms
            d = math.abs(math.log(camera.shutter.ms,2) - math.log(ms,2))
        elseif method == 3 then
            local apex = math.random(-5*100,12*100)/100
            camera.shutter.apex = apex
            d = math.abs(camera.shutter.apex - apex)
        elseif method == 4 then
            local raw = math.random(16,152)
            camera.shutter.raw = raw
            d = math.abs(camera.shutter.raw - raw) / 8
        end

        -- difference between requested and actual shutter speed should be max 1.5/8 EV
        -- (most cameras accept 0, 3/8, 4/8, 5/8, 1 EV, the largest gap being 3/8 EV,
        --  and you should always get the nearest valid shutter speed)
        if d > 1.5/8 + 1e-3 then
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            printf("Error: shutter delta %s EV\n", d)
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        end

        -- seconds and ms fields should be consistent
        if math.abs(camera.shutter.value - camera.shutter.ms/1000) > 1e-3 then
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            printf("Error: shutter %ss != %sms\n", camera.shutter.value, camera.shutter.ms)
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        end
        
        -- seconds and apex should be consistent
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        -- see http://dougkerr.net/Pumpkin/articles/APEX.pdf
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        local expected_apex = math.log(1/camera.shutter.value,2)
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        if math.abs(expected_apex - camera.shutter.apex) > 0.01 then
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            printf("Error: shutter %ss != Tv%s, expected %s\n", camera.shutter.value, camera.shutter.apex, expected_apex)
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        end
        
        -- setting shutter to the same value, using any method (s,ms,apex,raw)
        -- should not change anything
        for i,field in pairs{"value","ms","apex","raw"} do
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            local current = {}
            current.apex  = camera.shutter.apex
            current.value = camera.shutter.value
            current.ms    = camera.shutter.ms
            current.raw   = camera.shutter.raw
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            -- ms is integer, so tests at very low values will fail because of roundoff errors
            -- however, if we have set the shutter in ms from the beginning, it will work fine
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            if field == "ms" and current.ms < 10 and method ~= 2 then
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                -- how do you write "continue" in Lua?!
                field = "value"
            end
            
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            camera.shutter[field] = current[field]
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            if camera.shutter.value ~= current.value then
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                printf("Error: shutter set to %s=%s, got %ss, expected %ss\n", field, current[field], camera.shutter.value, current.value)
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            end
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            if camera.shutter.ms ~= current.ms then
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                printf("Error: shutter set to %s=%s, got %sms, expected %sms\n", field, current[field], camera.shutter.ms, current.ms)
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            end
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            if camera.shutter.apex ~= current.apex then
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                printf("Error: shutter set to %s=%s, got Tv%s, expected Tv%s\n", field, current[field], camera.shutter.apex, current.apex)
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            end
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            if camera.shutter.raw ~= current.raw then
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                printf("Error: shutter set to %s=%s, got %s, expected %s (raw)\n", field, current[field], camera.shutter.raw, current.raw)
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            end
        end
    end
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    camera.shutter.raw = old_value
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    request_mode(MODE.M, "M")
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    old_value = camera.iso.raw
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    printf("Setting ISO to random values...\n")
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    for k = 1,100 do
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        local method = math.random(1,3)
        local d = nil
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        if method == 1 then
            local iso = math.random(100, 6400)
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            if math.random(1,2) == 1 then
                camera.iso.value = iso
            else
                camera.iso = iso
            end
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            d = math.abs(math.log(camera.iso.value,2) - math.log(iso,2))
        elseif method == 2 then
            local apex = math.random(5*100,11*100)/100
            camera.iso.apex = apex
            d = math.abs(camera.iso.apex - apex)
        elseif method == 3 then
            local raw = math.random(72, 120)
            camera.iso.raw = raw
            d = math.abs(camera.iso.raw - raw) / 8
        end

        -- difference between requested and actual ISO should be max 1/3 EV
        if d > 1/3 then
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            printf("Error: ISO delta %s EV\n", d)
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        end

        -- ISO and Sv (APEX) should be consistent
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        local expected_apex = math.log(camera.iso.value/3.125, 2)
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        if math.abs(expected_apex - camera.iso.apex) > 0.2 then
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            printf("Error: ISO %s != Sv%s, expected %s\n", camera.iso.value, camera.iso.apex, expected_apex)
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        end

        -- setting ISO to the same value, using any method (value,apex,raw)
        -- should not change anything
        for i,field in pairs{"value","apex","raw"} do
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            local current = {}
            current.apex  = camera.iso.apex
            current.value = camera.iso.value
            current.raw   = camera.iso.raw
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            camera.iso[field] = current[field]
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            if camera.iso.value ~= current.value then
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                printf("Error: ISO set to %s=%s, got %s, expected %s\n", field, current[field], camera.iso.value, current.value)
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            end
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            if camera.iso.apex ~= current.apex then
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                printf("Error: ISO set to %s=%s, got Sv%s, expected Sv%s\n", field, current[field], camera.iso.apex, current.apex)
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            end
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            if camera.iso.raw ~= current.raw then
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                printf("Error: ISO set to %s=%s, got %s, expected %s (raw)\n", field, current[field], camera.iso.raw, current.raw)
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            end
        end
    end
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    camera.iso.raw = old_value
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    if camera.aperture.min.raw == camera.aperture.max.raw then
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        printf("This lens does not have variable aperture (skipping test).\n")
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    else
        request_mode(MODE.M, "M")
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        old_value = camera.aperture.raw
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        printf("Setting aperture to random values...\n")
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        for k = 1,100 do
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            local method = math.random(1,3)
            local d = nil
            local extra_tol = 0
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            if method == 1 then
                local av = math.random(round(camera.aperture.min.value*10), round(camera.aperture.max.value*10)) / 10
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                if math.random(1,2) == 1 then
                    camera.aperture.value = av
                else
                    camera.aperture = av
                end
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                d = math.abs(math.log(camera.aperture.value,2) - math.log(av,2)) * 2
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                -- when checking the result, allow a larger difference (0.1 units) - see note below
                extra_tol = math.abs(math.log(av,2) - math.log(av-0.1,2)) * 2
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            elseif method == 2 then
                local apex = math.random(round(camera.aperture.min.apex*100), round(camera.aperture.max.apex*100)) / 100
                camera.aperture.apex = apex
                d = math.abs(camera.aperture.apex - apex)
            elseif method == 3 then
                local raw = math.random(camera.aperture.min.raw, camera.aperture.max.raw)
                camera.aperture.raw = raw
                d = math.abs(camera.aperture.raw - raw) / 8
            end

            -- difference between requested and actual aperture should be max 1.5/8 EV
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            -- note: when using F-numbers, the difference may be larger, because of the rounding done
            -- to match Canon values (e.g. raw 48 would be f/5.66 (f/5.7), instead of Canon's f/5.6)
            if (d > 1.5/8 + extra_tol) then
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                printf("Error: aperture delta %s EV (expected < %s, %s, method=%d)\n", d, 1.5/8 + extra_tol, camera.aperture, method)
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            end

            -- aperture and Av (APEX) should be consistent
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            local expected_apex = math.log(camera.aperture.value, 2) * 2
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            if math.abs(expected_apex - camera.aperture.apex) > 0.2 then
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                printf("Error: aperture %s != Av%s, expected %s\n", camera.aperture.value, camera.aperture.apex, expected_apex)
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            end

            -- setting aperture to the same value, using any method (value,apex,raw)
            -- should not change anything
            for i,field in pairs{"value","apex","raw"} do
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                local current = {}
                current.apex  = camera.aperture.apex
                current.value = camera.aperture.value
                current.raw   = camera.aperture.raw
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                camera.aperture[field] = current[field]
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                if camera.aperture.value ~= current.value then
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                    printf("Error: aperture set to %s=%s, got %s, expected %s\n", field, current[field], camera.aperture.value, current.value)
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                end
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                if camera.aperture.apex ~= current.apex then
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                    printf("Error: aperture set to %s=%s, got Sv%s, expected Sv%s\n", field, current[field], camera.aperture.apex, current.apex)
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                end
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                if camera.aperture.raw ~= current.raw then
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                    printf("Error: aperture set to %s=%s, got %s, expected %s (raw)\n", field, current[field], camera.aperture.raw, current.raw)
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                end
            end
        end
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        camera.aperture.raw = old_value
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    end

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    request_mode(MODE.AV, "Av")
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    old_value = camera.ec.raw
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    printf("Setting EC to random values...\n")
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    for k = 1,100 do
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        local method = math.random(1,2)
        local d = nil
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        if method == 1 then
            local ec = math.random(-2*100, 2*100) / 100
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            if math.random(1,2) == 1 then
                camera.ec.value = ec
            else
                camera.ec = ec
            end
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            d = math.abs(camera.ec.value - ec,2)
        elseif method == 2 then
            local raw = math.random(-16, 16)
            camera.ec.raw = raw
            d = math.abs(camera.ec.raw - raw) / 8
        end

        -- difference between requested and actual EC should be max 1.5/8 EV
        if d > 1.5/8 then
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            printf("Error: EC delta %s EV\n", d)
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        end

        -- EC and raw should be consistent
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        local expected_ec = camera.ec.raw / 8
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        if math.abs(expected_ec - camera.ec.value) > 0.001 then
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            printf("Error: EC raw %s != %s EV, expected %s EV\n", camera.ec.raw, camera.ec.value, expected_ec)
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        end

        -- setting EC to the same value, using any method (value,raw)
        -- should not change anything
        for i,field in pairs{"value","raw"} do
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            local current = {}
            current.value = camera.ec.value
            current.raw   = camera.ec.raw
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            camera.ec[field] = current[field]
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            if camera.ec.value ~= current.value then
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                printf("Error: EC set to %s=%s, got %s, expected %s EV\n", field, current[field], camera.ec.value, current.value)
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            end
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            if camera.ec.raw ~= current.raw then
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                printf("Error: EC set to %s=%s, got %s, expected %s (raw)\n", field, current[field], camera.ec.raw, current.raw)
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            end
        end
    end
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    camera.ec.raw = old_value
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    -- copy/paste & replace from EC (those two should behave in the same way)
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    old_value = camera.flash_ec.raw
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    printf("Setting Flash EC to random values...\n")
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    for k = 1,100 do
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        local method = math.random(1,2)
        local d = nil
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        if method == 1 then
            local fec = math.random(-2*100, 2*100) / 100
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            if math.random(1,2) == 1 then
                camera.flash_ec.value = fec
            else
                camera.flash_ec = fec
            end
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            d = math.abs(camera.flash_ec.value - fec,2)
        elseif method == 2 then
            local raw = math.random(-16, 16)
            camera.flash_ec.raw = raw
            d = math.abs(camera.flash_ec.raw - raw) / 8
        end

        -- difference between requested and actual EC should be max 1.5/8 EV
        if d > 1.5/8 then
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            printf("Error: FEC delta %s EV\n", d)
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        end

        -- EC and raw should be consistent
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        local expected_fec = camera.flash_ec.raw / 8
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        if math.abs(expected_fec - camera.flash_ec.value) > 0.001 then
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            printf("Error: FEC raw %s != %s EV, expected %s EV\n", camera.flash_ec.raw, camera.flash_ec.value, current.expected_fec)
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        end

        -- setting EC to the same value, using any method (value,raw)
        -- should not change anything
        for i,field in pairs{"value","raw"} do
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            local current = {}
            current.value = camera.flash_ec.value
            current.raw   = camera.flash_ec.raw
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            camera.flash_ec[field] = current[field]
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            if camera.flash_ec.value ~= current.value then
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                printf("Error: FEC set to %s=%s, got %s, expected %s EV\n", field, current[field], camera.flash_ec.value, current.value)
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            end
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            if camera.flash_ec.raw ~= current.raw then
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                printf("Error: FEC set to %s=%s, got %s, expected %s (raw)\n", field, current[field], camera.flash_ec.raw, current.raw)
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            end
        end
    end
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    camera.flash_ec.raw = old_value
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    printf("Exposure tests completed.\n")
    printf("\n")
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end

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function print_file_size(filename)
    local f = io.open(filename, "rb")
    if f then
        local size = f:seek("end", 0)
        f:close()
        printf("%s: %s\n", filename, size);
        return size
    else
        printf("%s not found.\n", filename);
    end
end

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function test_camera_take_pics()
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    printf("Testing picture taking functions...\n")
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    local initial_file_num

    request_mode(MODE.M, "M")
    camera.shutter = 1/50
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    sleep(2)
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    printf("Snap simulation test...\n")
    assert(menu.set("Shoot Preferences", "Snap Simulation", 1))
    initial_file_num = dryos.shooting_card.file_number
    camera.shoot()
    assert(dryos.shooting_card.file_number == initial_file_num)
    assert(menu.set("Shoot Preferences", "Snap Simulation", 0))

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    sleep(2)
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    printf("Single picture...\n")
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    -- let's also check if we can find the image file
    -- fixme: a way to check these routines when the image number wraps around at 10000
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    initial_file_num = dryos.shooting_card.file_number
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    local image_path = dryos.dcim_dir.path ..  dryos.image_prefix .. string.format("%04d", (initial_file_num + 1) % 10000)
    local image_path_cr2 = image_path .. ".CR2"
    local image_path_jpg = image_path .. ".JPG"
    -- the image file(s) should not be present before taking the picture :)
    assert(io.open(image_path_cr2, "rb") == nil)
    assert(io.open(image_path_jpg, "rb") == nil)

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    camera.shoot()
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    -- but either CR2 or JPG should be there afterwards (or maybe both)
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    assert((dryos.shooting_card.file_number - initial_file_num) % 10000 == 1)
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    camera.wait()
    local size_cr2 = print_file_size(image_path_cr2)
    local size_jpg = print_file_size(image_path_jpg)
    assert(size_cr2 or size_jpg)

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    -- let's review it
    assert(camera.gui.qr or camera.gui.idle)
    camera.gui.play = true
    assert(camera.gui.play == true)
    assert(camera.gui.play_photo == true)
    assert(camera.gui.play_movie == false)

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    sleep(2)
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    printf("Two burst pictures...\n")
    printf("Ideally, the camera should be in some continuous shooting mode (not checked).\n")
    initial_file_num = dryos.shooting_card.file_number
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    -- we should also be able to change the file prefix
    local old_prefix = dryos.image_prefix
    dryos.image_prefix = "ABC_"
    assert(dryos.image_prefix == "ABC_")
    local image1_path = dryos.dcim_dir.path ..  dryos.image_prefix .. string.format("%04d", (initial_file_num + 1) % 10000)
    local image1_path_cr2 = image1_path .. ".CR2"
    local image1_path_jpg = image1_path .. ".JPG"
    local image2_path = dryos.dcim_dir.path ..  dryos.image_prefix .. string.format("%04d", (initial_file_num + 2) % 10000)
    local image2_path_cr2 = image2_path .. ".CR2"
    local image2_path_jpg = image2_path .. ".JPG"
    assert(io.open(image1_path_cr2, "rb") == nil)
    assert(io.open(image1_path_jpg, "rb") == nil)
    assert(io.open(image2_path_cr2, "rb") == nil)
    assert(io.open(image2_path_jpg, "rb") == nil)

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    camera.burst(2)
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    assert((dryos.shooting_card.file_number - initial_file_num) % 10000 == 2)
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    camera.wait()
    local size1_cr2 = print_file_size(image1_path_cr2)
    local size1_jpg = print_file_size(image1_path_jpg)
    local size2_cr2 = print_file_size(image2_path_cr2)
    local size2_jpg = print_file_size(image2_path_jpg)
    assert(size1_cr2 or size1_jpg)
    assert(size2_cr2 or size2_jpg)
    dryos.image_prefix = ""     -- empty string restores the old prefix
    assert(dryos.image_prefix == old_prefix)

    -- let's try some more
    dryos.image_prefix = "XYZ_"
    assert(dryos.image_prefix == "XYZ_")
    dryos.image_prefix = "1234"
    assert(dryos.image_prefix == "1234")
    dryos.image_prefix = "$#@!"
    assert(dryos.image_prefix == "$#@!")
    dryos.image_prefix = ""
    assert(dryos.image_prefix == old_prefix)

    printf("Bracketed pictures...\n")
    initial_file_num = dryos.shooting_card.file_number
    camera.shutter.value = 1/500
    camera.shoot()
    camera.shutter.value = 1/50
    camera.shoot()
    camera.shutter.value = 1/5
    camera.shoot()
    assert((dryos.shooting_card.file_number - initial_file_num) % 10000 == 3)
    camera.wait()
    -- fixme: how to check metadata in the files?
    for i = dryos.shooting_card.file_number - 2, dryos.shooting_card.file_number do
        image_path = dryos.dcim_dir.path ..  dryos.image_prefix .. string.format("%04d", i % 10000)
        image_path_cr2 = image_path .. ".CR2"
        image_path_jpg = image_path .. ".JPG"
        local size_cr2 = print_file_size(image_path_cr2)
        local size_jpg = print_file_size(image_path_jpg)
        assert(size_cr2 or size_jpg)
    end
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    sleep(2)
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    printf("Bulb picture...\n")
    local t0 = dryos.ms_clock
    initial_file_num = dryos.shooting_card.file_number
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    image_path = dryos.dcim_dir.path ..  dryos.image_prefix .. string.format("%04d", (initial_file_num + 1) % 10000)
    image_path_cr2 = image_path .. ".CR2"
    image_path_jpg = image_path .. ".JPG"
    assert(io.open(image_path_cr2, "rb") == nil)
    assert(io.open(image_path_jpg, "rb") == nil)

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    camera.bulb(10)
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    local t1 = dryos.ms_clock
    local elapsed = t1 - t0
    printf("Elapsed time: %s\n", elapsed)
    -- we can't measure this time accurately, so we only do a very rough check
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    -- slow cards may be an issue, so let's allow a wide error margin
    assert(elapsed > 9900 and elapsed < 30000)
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    assert((dryos.shooting_card.file_number - initial_file_num) % 10000 == 1)
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    camera.wait()
    local size_cr2 = print_file_size(image_path_cr2)
    local size_jpg = print_file_size(image_path_jpg)
    assert(size_cr2 or size_jpg)
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    printf("Picture taking tests completed.\n")
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    printf("\n")
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    sleep(5)
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end

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function test_lv()
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    request_mode(MODE.M, "M")

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    printf("Testing module 'lv'...\n")
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    if lv.enabled then
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        printf("LiveView is running; stopping...\n")
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        lv.stop()
        assert(not lv.enabled, "LiveView did not stop")
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        sleep(2)