local CAM_SPEED = 10

camera = {}
camera.target = 0
camera.offset = { x = 0, y = 0 }
local fullscreen = false

local altPressed, enterPressed = false, false
function camera.keypressed(key, _)
	if key == "return" then enterPressed = true end
	if key == "lalt" then altPressed = true end
	if key == "f11" 
	   or (altPressed and key == "return")
	   or (enterPressed and key == "lalt") then
		fullscreen = not fullscreen
		love.window.setFullscreen(fullscreen, "desktop")
	end
end


function camera.keyreleased(key, _)
	if key == "u" then error("You pressed the U key!") end
	if key == "lalt" then
		altPressed = false
	end
	if key == "return" then
		enterPressed = false
	end
	local change = false
	if key == "-" or key == "kp-" or key == "pagedown" then
		if scale > 1 then
			ui.update_scale(scale - 1)
		else
			ui.update_scale(scale * 0.5)
		end
		change = true
	end
	if key == "+" or key == "kp+" or key == "pageup" then
		if scale >= 1 then
			ui.update_scale(scale + 1)
		else
			ui.update_scale(scale * 2)
		end
		change = true
	end
	if key == "kp0" then
		scale = 1
		change = true
	end
	if scale < 0.125 then ui.update_scale(0.125) change = false end
	if scale > 8 then ui.update_scale(8) change = false end
	if change then camera.setplayer() end
end


function camera.input(dt)
	-- TODO: rewrite for scale, so player always remains in view at max distance
	-- direct view control
	if love.keyboard.isDown("left") then
		camera.offset.x = camera.offset.x + dt * 300
	end
	if love.keyboard.isDown("right") then
		camera.offset.x = camera.offset.x - dt * 300
	end
	if love.keyboard.isDown("up") then
		camera.offset.y = camera.offset.y + dt * 300
	end
	if love.keyboard.isDown("down") then
		camera.offset.y = camera.offset.y - dt * 300
	end
	camera.offsetclamp()
end


function camera.resize()
		camera.setplayer()
end


function camera.offsetclamp()
	if camera.offset.x > (window.x/2) / scale then
		camera.offset.x = (window.x/2) / scale
	end
	if camera.offset.x < -(window.x/2) / scale then
		camera.offset.x = -(window.x/2) / scale
	end
	if camera.offset.y > (window.y/2) / scale then
		camera.offset.y = (window.y/2) / scale
	end
	if camera.offset.y < -(window.y/2) / scale then
		camera.offset.y = -(window.y/2) / scale
	end
end


function camera.setplayer()
	if camera.target == 0 then return end
	player = participants[camera.target]
	camera.offsetclamp()
	local perfectx = math.floor(player.x * -1) + ((window.x -300)/2 -((player.avatar:getWidth() /2) / scale)) / scale + camera.offset.x
	local perfecty = math.floor(player.y * -1) + (window.y/2 -((player.avatar:getHeight() /2) / scale)) / scale + camera.offset.y

	view.x = perfectx
	view.y = perfecty
end


function camera.update()
	if camera.target == 0 then return end
	player = participants[camera.target]
	--[[ Update camera to track player ]]--
	local perfectx = math.floor(player.x * -1)  + ((window.x -300)/2 -(player.avatar:getWidth() /2)) / scale + camera.offset.x
	local perfecty = math.floor(player.y * -1)  + (window.y/2 -(player.avatar:getHeight() /2)) / scale + camera.offset.y

	local deltax = (perfectx - view.x) / scale
	local deltay = (perfecty - view.y) / scale
	view.x = view.x + (deltax /(CAM_SPEED / (scale * scale)))
	view.y = view.y + (deltay /(CAM_SPEED / (scale * scale)))
end