-- Lesson 19:  Text That Looks Good.  The finished script, exactly as the lesson ends.
dofile("Singe/Framework.singe")

overlaySetResolution(discGetWidth(), discGetHeight())

local MARGIN  = 24
local TITLE_Y = 60
local SCORE_Y = 170
local LABEL_Y = 186
local HINT_Y  = 300
local CLOCK_Y = 430

local score      = 0
local titleFont  = nil
local scoreFont  = nil
local smallFont  = nil
local titleImage = nil
local hintImage  = nil
local scoreImage = nil
local scoreShown = nil


local function centred(image)
    return (overlayGetWidth() - spriteGetWidth(image)) / 2
end


local function renderScore()
    if scoreImage ~= nil then
        spriteUnload(scoreImage)
    end
    fontSelect(scoreFont)
    colorForeground(255, 255, 255)
    scoreImage = fontToSprite(string.format("%06d", score))
    scoreShown = score
end


fontQuality(FONT_QUALITY_BLENDED)

titleFont = fontLoad("Singe/FreeSansBold.ttf", 48)
scoreFont = fontLoad("Singe/FreeSansBold.ttf", 36)
smallFont = fontLoad("Singe/FreeSansBold.ttf", 18)

fontSelect(titleFont)
colorForeground(255, 211, 90)
titleImage = fontToSprite("ASTEROID PATROL")

fontSelect(smallFont)
colorForeground(140, 200, 255)
hintImage = fontToSprite("Press the fire button to score")

renderScore()


function onInputPressed(what)
    if what == SWITCH_BUTTON1 then
        score = score + 125
    end
end


function onOverlayUpdate()
    overlayClear()

    spriteDraw(titleImage, centred(titleImage), TITLE_Y)

    if score ~= scoreShown then
        renderScore()
    end
    spriteDraw(scoreImage, overlayGetWidth() - MARGIN - spriteGetWidth(scoreImage), SCORE_Y)

    fontSelect(smallFont)
    colorForeground(160, 160, 160)
    fontPrint(MARGIN, LABEL_Y, "SCORE")
    fontPrint(MARGIN, CLOCK_Y, "Running for " .. (singeGetTicks() // 1000) .. " seconds")

    if (singeGetTicks() // 500) % 2 == 0 then
        spriteDraw(hintImage, centred(hintImage), HINT_Y)
    end

    return OVERLAY_UPDATED
end


function onShutdown()
    spriteUnload(titleImage)
    spriteUnload(hintImage)
    if scoreImage ~= nil then
        spriteUnload(scoreImage)
    end
    fontUnload(titleFont)
    fontUnload(scoreFont)
    fontUnload(smallFont)
end