-- Forge tutorial 6, "A light gun game":  the kit's clip as the disc, a gun on the pointer, hit
-- boxes drawn on the timeline where the target and the hand are, ammo and a reload off the
-- picture, and a score.  Starts from New game.
TUTORIAL = { number = 6, name = "06-gun", tag = "TUTORIAL6" }
dofile("testScripts/tutorialDrive.singe")

local frames = 0
local stage  = 0
local game   = nil
local fired  = {}
local shot   = false

tutorialBegin(nil)


local function lightType(name)
	local names = {}
	local from, to = 1, 1

	for typeName in pairs(FORGE.game.types) do
		names[#names + 1] = typeName
	end
	table.sort(names)
	for at, typeName in ipairs(names) do
		if typeName == FORGE.typeName then
			from = at
		end
		if typeName == name then
			to = at
		end
	end
	for _ = 1, math.abs(to - from) do
		key((to > from) and SCANCODE.DOWN or SCANCODE.UP)
	end
end


local function ruleGo(index, part)
	local guard = 0

	while ((FORGE.rule ~= index) or (FORGE.part ~= (part or 0))) and (guard < 60) do
		local past = (FORGE.rule > index) or ((FORGE.rule == index) and (FORGE.part > (part or 0)))

		key(past and SCANCODE.UP or SCANCODE.DOWN)
		guard = guard + 1
	end
end


local function place(x, y)
	key(SCANCODE.MAIN_1)
	key(SCANCODE.A)
	local entry = forgeRoom().entities[FORGE.selected]

	forgePress(entry.x, entry.y)
	forgeDrag(x, y)
	forgeRelease()
end


local function rule(note, on, filters)
	key(SCANCODE.N)
	form("note", note)
	key(SCANCODE.E)
	pick(on)
	for _, pair in ipairs(filters or {}) do
		form(pair[1], pair[2])
	end
end


local function part(partKey, name, fields)
	key(partKey)
	pick(name)
	for _, pair in ipairs(fields or {}) do
		form(pair[1], pair[2])
	end
end


-- The cursor to a frame, by the leap and step keys, as a reader would.
local function cursorTo(frame)
	while FORGE.cursor + 10 <= frame do
		key(SCANCODE.RIGHTBRACKET)
	end
	while FORGE.cursor < frame do
		key(SCANCODE.PERIOD)
	end
	while FORGE.cursor > frame do
		key(SCANCODE.COMMA)
	end
end


-- A key on the selected track at a frame, its box typed.
local function keyAt(frame, x, y, w, h)
	cursorTo(frame)
	key(SCANCODE.K)
	form("x", x)
	form("y", y)
	form("w", w)
	form("h", h)
end


local function step()
	if stage == 1 then
		key(SCANCODE.MAIN_1)
		selectEntity("hero")
		key(SCANCODE.DELETE)
		selectEntity("ground")
		key(SCANCODE.DELETE)
		key(SCANCODE.MAIN_2)
		lightType("hero")
		key(SCANCODE.DELETE)
		lightType("ground")
		key(SCANCODE.DELETE)
		key(SCANCODE.MAIN_3)
		ruleGo(1, 0)
		key(SCANCODE.DELETE)
		key(SCANCODE.DELETE)
		key(SCANCODE.DELETE)
		key(SCANCODE.MAIN_1)
		forgeSelect(nil)
		form("title", "Draw")
		form("vars", "score=0, misses=0")
		form("layers", "disc, overlay")
		form("disc.file", "clip.mkv")

	elseif stage == 2 then
		-- The gun, and the two things it can hit.
		key(SCANCODE.MAIN_2)
		key(SCANCODE.A)
		form("name", "gun")
		form("look", "none")
		form("vars", "ammo=6")
		form("behaviours", "gun")
		form("gun.player", 1)
		form("gun.ammo", 6)
		form("gun.reload", "offscreen")
		key(SCANCODE.A)
		form("name", "target")
		form("look", "none")
		form("vars", "health=1")
		form("behaviours", "hitbox, health")
		form("hitbox.track", "target")
		form("health.max", 1)
		key(SCANCODE.A)
		form("name", "hand")
		form("look", "none")
		form("behaviours", "hitbox")
		form("hitbox.track", "hand")
		tutorialShot("types")

	elseif stage == 3 then
		lightType("gun")
		place(30, 450)
		key(SCANCODE.MAIN_2)
		lightType("target")
		place(450, 210)
		key(SCANCODE.MAIN_2)
		lightType("hand")
		place(600, 210)

	elseif stage == 4 then
		-- The tracks:  where the target is, frame by frame, and where the hand is.
		key(SCANCODE.MAIN_4)
		key(SCANCODE.N)
		form("name", "target")
		keyAt(150, 405, 165, 90, 90)
		tutorialShot("firstKey")

	elseif stage == 5 then
		keyAt(210, 405, 165, 90, 90)
		key(SCANCODE.N)
		form("name", "hand")
		keyAt(220, 480, 157, 240, 105)
		keyAt(260, 480, 157, 240, 105)
		cursorTo(180)
		tutorialShot("tracks")

	elseif stage == 6 then
		key(SCANCODE.MAIN_3)
		rule("The target is hit", "hit", { { "type", "target" } })
		part(SCANCODE.T, "addScore", { { "amount", 100 } })
		part(SCANCODE.T, "damage", { { "amount", 1 } })
		part(SCANCODE.T, "playSound", { { "file", "hit.wav" } })
		rule("The hand is hit", "hit", { { "type", "hand" } })
		part(SCANCODE.T, "addScore", { { "amount", -200 } })
		part(SCANCODE.T, "flash", { { "r", 255 }, { "g", 40 }, { "b", 40 }, { "seconds", 0.3 } })
		rule("A shot at nothing", "miss", {})
		part(SCANCODE.C, "test", { { "expr", "not event.offscreen" } })
		part(SCANCODE.T, "addVar", { { "name", "misses" }, { "amount", 1 } })
		clear("entity")
		part(SCANCODE.T, "playSound", { { "file", "shot.wav" } })
		rule("Draw!", "frameReached", { { "frame", 150 } })
		part(SCANCODE.T, "say", { { "text", '"DRAW!"' }, { "seconds", 1 } })
		ruleGo(1, 1)
		form("text", '"score " .. score .. "  ammo " .. gun.ammo .. "  misses " .. misses')
		tutorialShot("rules")

	elseif stage == 7 then
		key(SCANCODE.S)
		local built = tutorialEnd()
		local mine  = onOverlayUpdate

		dofile(built)
		game            = onOverlayUpdate
		onOverlayUpdate = mine
	end
end


-- A shot from the pointer at a frame of the disc, once.
local function fireAt(frame, x, y, now)
	if (now >= frame) and not fired[frame] then
		fired[frame] = true
		authorSetPointer(1, x, y)
		authorSwitchDown(SWITCH_BUTTON3)
		authorSwitchUp(SWITCH_BUTTON3)
	end
end


function onOverlayUpdate()
	frames = frames + 1
	if frames % 12 == 0 and stage < 7 then
		stage = stage + 1
		step()
	end
	if game ~= nil then
		local frame = discGetFrame()

		fireAt(170, 450, 210, frame)   -- the target
		fireAt(190, 100, 100, frame)   -- the wall
		fireAt(240, 620, 210, frame)   -- the hand
		if (frame >= 175) and not shot then
			shot = true
			tutorialShot("playing")
		end
		if frame >= 270 then
			debugPrint(string.format("%s at frame %d:  score %s, misses %s, ammo %s", TUTORIAL.tag, frame, tostring(AUTHOR_VARS.score), tostring(AUTHOR_VARS.misses), tostring(authorEntity("gun").vars.ammo)))
			if (AUTHOR_VARS.score ~= -100) or (AUTHOR_VARS.misses ~= 1) then
				debugPrint(TUTORIAL.tag .. " FAIL a hit on the target, a miss on the wall, and a hit on the hand should score -100 with one miss")
			end
			debugPrint(TUTORIAL.tag .. " RESULT done")
			singeQuit()
		end
		return game()
	end
	forgeDraw(nil, nil)

	return OVERLAY_UPDATED
end