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-- Colors

local COLOR_PLAYER_1 = {200/255, 255/255, 200/255}
local COLOR_PLAYER_2 = {200/255, 200/255, 255/255}
local COLOR_WHITE = {255/255,255/255,255/255}
local COLOR_LOWER = {230/255, 230/255, 255/255}
local COLOR_BG = {26/255,26/255,26/255}


--------------------------------------------------------------------------------


WINDOW_WIDTH, WINDOW_HEIGTH  =  800, 600

local SOMEBODY_ONCE = false
local SOMEBODY_MUSC = love.audio.newSource('/All_Star_NoIntro.mp3', 'stream')
      SOMEBODY_MUSC:setLooping(true)
      SOMEBODY_MUSC:play()
local SOMEBODIES    = {}

local plat = require "plat"
local color = require "color_tools"
local FONT = love.graphics.newFont('star_font.ttf', 60)
love.graphics.setFont(FONT)

local system, player_1, player_2, reset_timer

-- Stars

local Stars = {}

function Stars:generate (nr_stars)
    for i = 1, 200 do
        self[#self+1] = math.random() * WINDOW_WIDTH
        self[#self+1] = math.random() ^ 2 * WINDOW_HEIGTH
    end
end

function Stars:update (dt, scores)
    local star_speed = dt * (scores[2] - scores[1])
    if star_speed == 0 then  return  end
    for i = 1, #self, 2 do
        self[i] = (self[i] + star_speed * self[i+1]/WINDOW_HEIGTH) % WINDOW_WIDTH
    end
end

function Stars:draw ()
    love.graphics.points(self)
end

-- Scores

local SCORES = { 0, 0 }

local function draw_scores ()
    love.graphics.printf(SCORES[1], 50, 600 - 80, 700, 'left')
    love.graphics.printf(SCORES[2], 50, 600 - 80, 700, 'right')
end

function reset_game ()
    system = plat.PlatformSystem.new()
    system:addPlatform(50, 400, 100, 50)
    system:addPlatform(800-50-100, 400, 100, 50)
    system:addPlatform(300, 200, 200, 50)
    local lower = system:addPlatform(300, 550, 200, 50)
          lower.resistance = -0.4
          lower.color = COLOR_LOWER

    player_1 = system:addPlayer(100, 50, 50, 50, {jump = 'w', left = 'a', right = 'd'})
    player_1.start_t   = 0
    player_1.controller.last_dir = 1

    player_2 = system:addPlayer(800 - 100 - 50, 50, 50, 50, {jump = 'up', left = 'left', right = 'right'})
    player_2.start_t   = 0
    player_2.controller.last_dir = -1

    reset_timer = nil

    if SOMEBODY_ONCE then
        local somb = SOMEBODY_MUSC:clone()
              somb:play()
              somb:setLooping(true)
        SOMEBODIES[#SOMEBODIES+1] = somb
    end
end

local function is_player_outside_bounds (player)
    return player.x + player.w < -100 or 900 < player.x or player.y > 700
end

--------------------------------------------------------------------------------

function love.load ()
    math.randomseed(os.time())
    Stars:generate(1000)
    reset_game()
end

local PLAYER_1_SHOOT = 's'
local PLAYER_2_SHOOT = 'down'

function love.update (dt)
    Stars:update(dt, SCORES)
    system:update(dt)

    -- Update color
    player_1.color = color.interpolate_rgb(COLOR_PLAYER_1, COLOR_WHITE, love.keyboard.isDown(PLAYER_1_SHOOT) and math.max(0, math.min(1, love.timer.getTime() - player_1.start_t)) or 0)
    player_2.color = color.interpolate_rgb(COLOR_PLAYER_2, COLOR_WHITE, love.keyboard.isDown(PLAYER_2_SHOOT) and math.max(0, math.min(1, love.timer.getTime() - player_2.start_t)) or 0)

    if reset_timer then
        reset_timer = reset_timer - dt
        if reset_timer < 0 then
            reset_game()
        end
    end
    if is_player_outside_bounds(player_1) and player_1.movable then
        SCORES[2] = SCORES[2] + 1
        player_1.movable = false
        reset_timer = 1
    end
    if is_player_outside_bounds(player_2) and player_2.movable then
        SCORES[1] = SCORES[1] + 1
        player_2.movable = false
        reset_timer = reset_timer or 1
    end
end

local function shoot_bullet_at_player (player)
    -- TODO: Add Timeout when shooting bullets shorter than 0.2
    local time = love.timer.getTime() - player.start_t
    local size = math.max(math.min( 1, time ), 0.2)
    local dx = player.controller.last_dir * (1.2 - size) * 600 + player.dx
    if dx ~= 0 then
        local bw, bh  =  math.floor(40*size + 0.5), math.floor(20*size + 0.5)
        local bx, by  =  player.x + player.w/2 - bw/2, player.y + player.h/2 - bh/2
        system:addBullet(bx, by, bw, bh, dx, player)
    end
end

function love.keyreleased (key)
    if key == PLAYER_1_SHOOT then  shoot_bullet_at_player(player_1)  end
    if key == PLAYER_2_SHOOT then  shoot_bullet_at_player(player_2)  end
end

function love.keypressed (key)
    if key == 'escape' then
        love.event.quit()
    end
    if key == 's' and player_1.start_t < love.timer.getTime() then
        player_1.start_t = love.timer.getTime()
    end
    if key == 'down' and player_2.start_t < love.timer.getTime() then
        player_2.start_t = love.timer.getTime()
    end
    if key == 'f2' then
        SOMEBODY_MUSC:stop()
    end
    if key == 'f1' then
        SOMEBODY_ONCE = not SOMEBODY_ONCE
    	if not SOMEBODY_ONCE then
    		for _, track in ipairs(SOMEBODIES) do
    			track:stop()
    		end
    		SOMEBODIES = {}
    	end
    end
end

function love.draw ()
    love.graphics.setBackgroundColor(COLOR_BG)
    love.graphics.setColor(COLOR_WHITE)

    -- Draw score
    draw_scores()

    -- Draw Stars
    Stars:draw()

    -- Draw System
	system:draw()

    if is_player_outside_bounds(player_1) then
        love.graphics.setColor(COLOR_PLAYER_1)
        love.graphics.rectangle('fill', player_1.x-4000, player_1.y, 8000, 50)
        love.graphics.rectangle('fill', player_1.x, player_1.y-4000, 50, 8000)
    end
    if is_player_outside_bounds(player_2) then
        love.graphics.setColor(COLOR_PLAYER_2)
        love.graphics.rectangle('fill', player_2.x-4000, player_2.y, 8000, 50)
        love.graphics.rectangle('fill', player_2.x, player_2.y-4000, 50, 8000)
    end

end