-- load 3d engine
g3d = require("g3d")



function love.load()
	-- GRAPHICS
		-- GOOD PIXEL
	love.graphics.setDefaultFilter("nearest")
		-- FONTS
	DefaultFont = love.graphics.newImageFont("assets/default_font.png",
   " abcdefghijklmnopqrstuvwxyz" ..
   "ABCDEFGHIJKLMNOPQRSTUVWXYZ0" ..
	 "123456789.,!?-+/():;%&`'*#=[]\"")
	love.graphics.setFont(DefaultFont)


	--fps_count
	fps_count = 0
	fps_second = 0
	fps_draw = 0
	fps_total = 0

	-- camera
	g3d.camera.pivot = { 0, 0, 0 }
	g3d.camera.position = { 0, 0, 0 } 
	g3d.camera.pitch = 0
	g3d.camera.zoom = 10
	speed = 0

	-- debug
	scroll = 0
	debug = false

	-- player
	player = {
		id = 1
	}
	-- enums
	require "scripts/enums"

	-- functions
	require "scripts/drawing_UI"

	--objects
	require "scripts/objects"
	require "scripts/units"

	-- levels
	require "scripts/levels"
	current_level = levels.main_menu

end

function love.update(dt)

	-- count frames per seconds
	if fps_second >= 1 then
		fps_second = fps_second - 1
		fps_draw = fps_count
		fps_count = 0
		fps_total = fps_total + 1
	end
	fps_second = fps_second + dt
	fps_dt = dt
	fps_count = fps_count + 1

	-- camera: slow, fast, medium?
	speed = 8

	-- do camera
	if not game_pause then
		g3d.camera.strategyViewMovement(dt,speed,is_scrolling)

		local center = -500
		local pos = {g3d.camera.position[1],g3d.camera.position[2]+center,g3d.camera.position[3]}
		current_level.skybox:setTransform(pos)
		-- movement: w,a,s,d,
		-- rotate: q,e
		-- move by screen: 20 px: sides, forward, backwards
		-- mouse scroll: zoom
	end

	-- select troops
	if love.mouse.isDown(1) == true then
		if selecting_troops == false then
			sel_pos_x = love.mouse.getX()
			sel_pos_y = love.mouse.getY()
			has_troops_selected = false
		end
		selecting_troops = true
	else
		if selecting_troops == true then
			-- somehow select entities in area
			has_troops_selected = true
		end
		selecting_troops = false
	end

	if has_troops_selected then

	end
end

function love.wheelmoved(_, y)
	if debug then
		scroll = scroll+15*y
	else
	-- get scroll to do zoom, and call camera update
	g3d.camera.zoom = math.min(math.max(3,g3d.camera.zoom-y/1.5),30)
	is_scrolling = true
	end
end

function love.keypressed(key)
	-- pause the game
	if key == "escape" then
		if game_pause then
			game_pause = false
		else
			game_pause = true
		end
	end

	-- select all units button
	if key == "f2" then
		if has_troops_selected then
			has_troops_selected = false
		else
			has_troops_selected = true
		end

		for _, u in pairs(current_level.units) do	for _, entity in pairs(current_level.entities) do
			if entity.unit ~= nil and entity.unit == u.id then
				if has_troops_selected then
					entity.is_selected = false
					entity.selected_model = nil
				else
					entity.is_selected = true
					entity.selected_model = g3d.newModel("assets/objects/horizontal_plane.obj",img.effects.is_selected,{entity.pos[1],entity.pos[2]+0.5,entity.pos[3]},{0,0,0},{16,16,16})
				end
			end
		end end
	end

	if key == "f1" then
		if debug then debug = false else debug = true end
	end
end

function love.draw()
-- get drawing globals
	game_width = love.graphics.getWidth()
	game_height = love.graphics.getHeight()

-- LAYER 1: THE WORLD
	draw_entity(current_level.skybox)

	-- draw every model in entities
	local ent_count = 0
	for _, entity in pairs(current_level.entities) do
		if entity.unit == nil then draw_entity(entity) end
	end

	-- draw every unit's troops
	for _, u in pairs(current_level.units) do	for _, entity in pairs(current_level.entities) do
		if entity.unit ~= nil and entity.unit == u.id then draw_entity(entity) end
	end end

-- LAYER 2: THE USER INTERFACE

	if game_pause then
		draw_pause_menu(30,30)
	else
		draw_combat_ui()
	end

-- LAYER 3: INPUT & DEBUG

	-- draw selection area
	if selecting_troops == true then
		love.graphics.rectangle("line",sel_pos_x,sel_pos_y, love.mouse.getX() - sel_pos_x, love.mouse.getY() - sel_pos_y)
	end

	-- debug
	if debug then draw_debug() end

end

------ DEBUG ------
function draw_debug()
	-- draw game data
	love.graphics.print("time: "..fps_total..", fps: "..fps_draw..", frametime: "..math.floor(fps_dt* 1000).."ms, x: "..math.floor(g3d.camera.position[1])..", y: "..math.floor(g3d.camera.position[2])..", z: "..math.floor(g3d.camera.position[3]), x, y)

	-- draw selected entities data (scrolleable?!)
	uc = 0
	for _, u in pairs(current_level.units) do	for _, entity in pairs(current_level.entities) do
		if entity.unit ~= nil and entity.unit == u.id then
			uc = uc + 1
			if entity.model ~= nil then
				if entity.is_animated and entity.is_selected == true then
					love.graphics.setColor(0,0,0,0.3)
					love.graphics.rectangle("fill",15,-85+80*uc+scroll,game_width-30,70)

					love.graphics.setColor(1,1,1)
					love.graphics.print("["..u.name..", model: "..entity.name.." (id: "..entity.num..")] (level id: "..entity.tnum..")",20,-80+80*uc+scroll)
					love.graphics.print("frame: "..entity.anim_frame.."/"..entity.anim_frames..", rm: \""..entity.rotate_mode.."\"",40,-60+80*uc+scroll)
					love.graphics.print("animation: "..entity.anim_path,40,-40+80*uc+scroll)
				end
			end
		end
	end end
end


function draw_pause_menu(w,h)
		love.graphics.setColor(1,1,1,0.3)
			love.graphics.rectangle("fill", w, h, game_width-2*w, game_height-2*h)
		love.graphics.setColor(1,1,1,1)
end
--------------------


------ MODELS ------
function draw_entity(entity)
	if entity.model ~= nil then
		-- do animated models if animated, if anim_path and if game playing
		if entity.is_animated == true and entity.anim_path ~= nil and game_pause ~= true then
			-- try to animate
			entity.anim_subframe = entity.anim_subframe + 30*fps_dt
			if entity.anim_subframe >= entity.anim_speed then
				entity.anim_frame = entity.anim_frame + 1
				entity.anim_subframe = entity.anim_subframe - entity.anim_speed
			end
			-- cycle
			if entity.anim_frame >= entity.anim_frames+1 then entity.anim_frame = entity.anim_frame - entity.anim_frames end
			-- change
			entity.model.mesh:setTexture(entity.anim_imgs[entity.anim_frame])
		end

		-- do rotating models if animated, if has to rotate and if game playing
		if entity.rotate_mode ~= nil and entity.rotate_mode ~= "none" and game_pause ~= true then
			local rm = entity.rotate_mode

			if rm == "cam_xz" then

				local sin = g3d.camera.position[1]-entity.model.translation[1]
				local cos = g3d.camera.position[3]-entity.model.translation[3]

				local angle = math.atan2(sin,cos)-math.rad(180)

				entity.model:setRotation(0,angle,0)
			end
		end

		if entity.shadow ~= nil then
			entity.shadow:draw()
		end

		if entity.is_selected ~= nil and entity.is_selected ~= false and entity.selected_model ~= nil then
			entity.selected_model:draw()
		end

		entity.model:draw()
	else -- simple loaded entities dont require so much fuss
		entity:draw()
	end
end
--------------------