function love.load()
	math.randomseed(os.time())
	highscores = {}
	require "load.rpc"
	require "load.graphics"
	require "load.fonts"
	require "load.sounds"
	require "load.bgm"
	require "load.save"
	require "load.bigint"
	require "load.version"
	loadSave()
	require "funcs"
	require "scene"
	
	--config["side_next"] = false
	--config["reverse_rotate"] = true
	--config["das_last_key"] = false
	--config["fullscreen"] = false

    runsystem = {
        drawfps = 0,
        updatefps = 0,
        updatedelta = 0,
        showperformancestatistics = false
    }

	love.window.setMode(love.graphics.getWidth(), love.graphics.getHeight(), {resizable = true});
		
	-- used for screenshots
	GLOBAL_CANVAS = love.graphics.newCanvas()

	-- init config
	initConfig()

	love.window.setFullscreen(config["fullscreen"])
	if config.secret then playSE("welcome") end

	-- import custom modules
	initModules()
end

function initModules()
	game_modes = {}
	mode_list = love.filesystem.getDirectoryItems("tetris/modes")
	for i=1,#mode_list do
		if(mode_list[i] ~= "gamemode.lua" and string.sub(mode_list[i], -4) == ".lua") then
			game_modes[#game_modes+1] = require ("tetris.modes."..string.sub(mode_list[i],1,-5))
		end
	end
	rulesets = {}
	rule_list = love.filesystem.getDirectoryItems("tetris/rulesets")
	for i=1,#rule_list do
		if(rule_list[i] ~= "ruleset.lua" and string.sub(rule_list[i], -4) == ".lua") then
			rulesets[#rulesets+1] = require ("tetris.rulesets."..string.sub(rule_list[i],1,-5))
		end
	end
	--sort mode/rule lists
	local function padnum(d) return ("%03d%s"):format(#d, d) end
	table.sort(game_modes, function(a,b)
	return tostring(a.name):gsub("%d+",padnum) < tostring(b.name):gsub("%d+",padnum) end)
	table.sort(rulesets, function(a,b)
	return tostring(a.name):gsub("%d+",padnum) < tostring(b.name):gsub("%d+",padnum) end)
end

function love.draw()
	love.graphics.setCanvas(GLOBAL_CANVAS)
	love.graphics.clear()

	love.graphics.push()

	-- get offset matrix
	love.graphics.setDefaultFilter("linear", "nearest")
	local width = love.graphics.getWidth()
	local height = love.graphics.getHeight()
	local scale_factor = math.min(width / 640, height / 480)
	love.graphics.translate(
		(width - scale_factor * 640) / 2,
		(height - scale_factor * 480) / 2
	)
	love.graphics.scale(scale_factor)
		
	scene:render()
    
    if runsystem.showperformancestatistics then
        love.graphics.setColor(1, 1, 1, 1)
        love.graphics.print('u='..tostring(runsystem.updatefps)..
                            '\nd='..tostring(runsystem.drawfps)..
                            '\ndel='..tostring(runsystem.updatedelta), 0, 0)
    end

	love.graphics.pop()
		
	love.graphics.setCanvas()
	love.graphics.setColor(1,1,1,1)
	love.graphics.draw(GLOBAL_CANVAS)
end

function love.keypressed(key, scancode)
	-- global hotkeys
	if scancode == "f4" then
		config["fullscreen"] = not config["fullscreen"]
		saveConfig()
		love.window.setFullscreen(config["fullscreen"])
	elseif scancode == "f2" and scene.title ~= "Input Config" and scene.title ~= "Game" then
		scene = InputConfigScene()
		switchBGM(nil)
	-- secret sound playing :eyes:
	elseif scancode == "f8" and scene.title == "Title" then
		config.secret = not config.secret
		saveConfig()
		scene.restart_message = true
		if config.secret then playSE("mode_decide")
		else playSE("erase") end
	-- f12 is reserved for saving screenshots
	elseif scancode == "f12" then
		local ss_name = os.date("ss/%Y-%m-%d_%H-%M-%S.png")
		local info = love.filesystem.getInfo("ss", "directory")
		if not info then
			love.filesystem.remove("ss")
			love.filesystem.createDirectory("ss")
		end
		print("Saving screenshot as "..ss_name)
		GLOBAL_CANVAS:newImageData():encode("png", ss_name)
    -- F9 toggles performance statistics for the new runsystem
    elseif scancode == "f9" then
        runsystem.showperformancestatistics = not runsystem.showperformancestatistics
	-- function keys are reserved
	elseif string.match(scancode, "^f[1-9]$") or string.match(scancode, "^f[1-9][0-9]+$") then
		return	
	-- escape is reserved for menu_back
	elseif scancode == "escape" then
		scene:onInputPress({input="menu_back", type="key", key=key, scancode=scancode})
	-- pass any other key to the scene, with its configured mapping
	else
		local input_pressed = nil
		if config.input and config.input.keys then
			input_pressed = config.input.keys[scancode]
		end
		scene:onInputPress({input=input_pressed, type="key", key=key, scancode=scancode})
	end
end

function love.keyreleased(key, scancode)
	-- escape is reserved for menu_back
	if scancode == "escape" then
		scene:onInputRelease({input="menu_back", type="key", key=key, scancode=scancode})
	-- function keys are reserved
	elseif string.match(scancode, "^f[1-9]$") or string.match(scancode, "^f[1-9][0-9]+$") then
		return	
	-- handle all other keys; tab is reserved, but the input config scene keeps it from getting configured as a game input, so pass tab to the scene here
	else
		local input_released = nil
		if config.input and config.input.keys then
			input_released = config.input.keys[scancode]
		end
		scene:onInputRelease({input=input_released, type="key", key=key, scancode=scancode})
	end
end

function love.joystickpressed(joystick, button)
	local input_pressed = nil
	if
		config.input and
		config.input.joysticks and
		config.input.joysticks[joystick:getName()] and
		config.input.joysticks[joystick:getName()].buttons
	then
		input_pressed = config.input.joysticks[joystick:getName()].buttons[button]
	end
	scene:onInputPress({input=input_pressed, type="joybutton", name=joystick:getName(), button=button})
end

function love.joystickreleased(joystick, button)
	local input_released = nil
	if
		config.input and
		config.input.joysticks and
		config.input.joysticks[joystick:getName()] and
		config.input.joysticks[joystick:getName()].buttons
	then
		input_released = config.input.joysticks[joystick:getName()].buttons[button]
	end
	scene:onInputRelease({input=input_released, type="joybutton", name=joystick:getName(), button=button})
end

function love.joystickaxis(joystick, axis, value)
	local input_pressed = nil
	local positive_released = nil
	local negative_released = nil
	if
		config.input and
		config.input.joysticks and
		config.input.joysticks[joystick:getName()] and
		config.input.joysticks[joystick:getName()].axes and
		config.input.joysticks[joystick:getName()].axes[axis] 
	then
		if math.abs(value) >= 1 then
			input_pressed = config.input.joysticks[joystick:getName()].axes[axis][value >= 1 and "positive" or "negative"]
		end
		positive_released = config.input.joysticks[joystick:getName()].axes[axis].positive
		negative_released = config.input.joysticks[joystick:getName()].axes[axis].negative
	end
	if math.abs(value) >= 1 then
		scene:onInputPress({input=input_pressed, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
	else
		scene:onInputRelease({input=positive_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
		scene:onInputRelease({input=negative_released, type="joyaxis", name=joystick:getName(), axis=axis, value=value})
	end
end

local last_hat_direction = ""
local directions = {
	["u"] = "up",
	["d"] = "down",
	["l"] = "left",
	["r"] = "right",
}

function love.joystickhat(joystick, hat, direction)
	local input_pressed = nil
	local has_hat = false
	if
		config.input and
		config.input.joysticks and
		config.input.joysticks[joystick:getName()] and
		config.input.joysticks[joystick:getName()].hats and
		config.input.joysticks[joystick:getName()].hats[hat]
	then
		if direction ~= "c" then
			input_pressed = config.input.joysticks[joystick:getName()].hats[hat][direction]
		end
		has_hat = true
	end
	if input_pressed then
		for i = 1, #direction do
			local char = direction:sub(i, i)
			local _, count = last_hat_direction:gsub(char, char)
			if count == 0 then
				scene:onInputPress({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
			end
		end
		for i = 1, #last_hat_direction do
			local char = last_hat_direction:sub(i, i)
			local _, count = direction:gsub(char, char)
			if count == 0 then
				scene:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
			end
		end
		last_hat_direction = direction
	elseif has_hat then
		for i, direction in ipairs{"d", "l", "ld", "lu", "r", "rd", "ru", "u"} do
			scene:onInputRelease({input=config.input.joysticks[joystick:getName()].hats[hat][direction], type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
		end
		last_hat_direction = ""
	elseif direction ~= "c" then
		for i = 1, #direction do
			local char = direction:sub(i, i)
			local _, count = last_hat_direction:gsub(char, char)
			if count == 0 then
				scene:onInputPress({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
			end
		end
		for i = 1, #last_hat_direction do
			local char = last_hat_direction:sub(i, i)
			local _, count = direction:gsub(char, char)
			if count == 0 then
				scene:onInputRelease({input=directions[char], type="joyhat", name=joystick:getName(), hat=hat, direction=char})
			end
		end
		last_hat_direction = direction
	else
		for i, direction in ipairs{"d", "l", "ld", "lu", "r", "rd", "ru", "u"} do
			scene:onInputRelease({input=nil, type="joyhat", name=joystick:getName(), hat=hat, direction=direction})
		end
		last_hat_direction = ""
	end
end

function love.focus(f)
	if f and (scene.title ~= "Game" or not scene.paused) then
		resumeBGM()
	else
		pauseBGM()
	end
end

function love.resize(w, h)
		GLOBAL_CANVAS:release()
		GLOBAL_CANVAS = love.graphics.newCanvas(w, h)
end

local TARGET_FPS = 60

--[[
-- OLD RUN CODE BELOW
function love.run()
	if love.load then love.load(love.arg.parseGameArguments(arg), arg) end

	if love.timer then love.timer.step() end

	local dt = 0

	local last_time = love.timer.getTime()
	local time_accumulator = 0
	return function()
		if love.event then
			love.event.pump()
			for name, a,b,c,d,e,f in love.event.poll() do
				if name == "quit" then
					if not love.quit or not love.quit() then
						return a or 0
					end
				end
				love.handlers[name](a,b,c,d,e,f)
			end
		end

		if love.timer then
			processBGMFadeout(love.timer.step())
		end
		
		if scene and scene.update and love.timer then
			scene:update()
			
			local frame_duration = 1.0 / TARGET_FPS
			if time_accumulator < frame_duration then
				if love.graphics and love.graphics.isActive() and love.draw then
					love.graphics.origin()
					love.graphics.clear(love.graphics.getBackgroundColor())
					love.draw()
					love.graphics.present()
				end
				local end_time = last_time + frame_duration
				local time = love.timer.getTime()
				while time < end_time do
					love.timer.sleep(0.001)
					time = love.timer.getTime()
				end
				time_accumulator = time_accumulator + time - last_time
			end
			time_accumulator = time_accumulator - frame_duration
		end
		last_time = love.timer.getTime()
	end
end
]]

function love.run()
    -- New Run system
    -- by rin
    -- aims to speedup the responsiveness of the game by
    -- only updating 60 times per second, but letting
    -- it poll as fast as it wants

    if not love.timer then
        error('new run system requires love.timer to function.')
    end

    if love.load then love.load(love.arg.parseGameArguments(arg), arg) end

	if love.timer then love.timer.step() end

    local tacc = 0
    local start_time = love.timer.getTime()

    return function()
        if love.event then
            love.event.pump()
            for n, a, b, c, d, e, f in love.event.poll() do
                if n == 'quit' then
                    if not love.quit or not love.quit() then
                        return a or 0
                    end
                end
                love.handlers[n](a, b, c, d, e, f)
            end
        end

        if love.timer then
			processBGMFadeout(love.timer.step())
		end

        local ut = love.timer.getTime() 
        runsystem.updatedelta = ut - start_time
        runsystem.updatefps = 1 / (ut - start_time)

        if scene and scene.update and love.timer then
            local delta = ut - start_time
            start_time = ut
            tacc = tacc + delta
        
            if tacc >= 1 / TARGET_FPS then
                runsystem.drawfps = 1 / tacc
                tacc = 0

                scene:update()

				if love.graphics and love.graphics.isActive() and love.draw then                    
					love.graphics.origin()
					love.graphics.clear(love.graphics.getBackgroundColor())
					love.draw()
					love.graphics.present()
				end
            end
        end
    end
end