WINDOW_WIDTH = 1280
WINDOW_HEIGHT = 720

VIRTUAL_WIDTH = 432
VIRTUAL_HEIGHT = 243

PADDLE_SPEED = 200
--[[
        define a class and specify objects of that class
        we will tie our paddles together with classes and objects
]]
Class = require 'class' -- from Paddle.lua... require the line    Paddle = Class{}
-- in order to get it to work, you need to import the library in main.lua with class = require 'class'
push = require 'push'

require 'Ball' -- require ball and paddle will have access to the class variable because they are declared first
require 'Paddle'



function love.load()
        math.randomseed(os.time())
        love.graphics.setDefaultFilter('nearest','nearest')

         --[[
                 player1Y = 30
                 player2Y = VIRTUAL_HEIGHT - 50
                 get replaced with paddle objects called paddle1 and paddle2
         ]]

        player1 = Paddle(5, 20, 5, 20) -- instatiate a paddle object. when you use the parentheses in what is called the constructor, init gets called through the class library implicitly
        player2 = Paddle(VIRTUAL_WIDTH - 10, VIRTUAL_HEIGHT - 30, 5, 20)
        ball = Ball(VIRTUAL_WIDTH/2 - 2, VIRTUAL_HEIGHT/2 - 2, 5, 5) -- instatiate the ball .... not balle!

         --[[
        these lines are no longer needed

        ballX = VIRTUAL_WIDTH/2-2
        ballY = VIRTUAL_HEIGHT/2-2

        ballDX = math.random(2) == 1 and -100 or 100
        ballDY = math.random(-50,50)

        ]]


        gameState = 'start'
        smallFont = love.graphics.newFont('04B_30__.ttf',8)
        scoreFont = love.graphics.newFont('TitilliumText22L005-webfont.ttf',14)

        love.graphics.setFont(smallFont)

        push:setupScreen(VIRTUAL_WIDTH,VIRTUAL_HEIGHT, WINDOW_WIDTH, WINDOW_HEIGHT, {
                                                        fullscreen = false,
                                                        vsync = true,
                                                        resizeable = false
                                                        })

        player1Score = 0
        player2Score = 0
end
function love.draw()
        push:apply('start')
        love.graphics.clear(40/255,45/255,52/255,255/255) -- map values to 0-1
        scoreFont = love.graphics.newFont('TitilliumText22L005-webfont.ttf',20)
        love.graphics.setFont(smallFont)
        if gameState == 'start' then
                love.graphics.printf('Hello Start State!', 0,20, VIRTUAL_WIDTH, 'center')
        elseif gameState == 'play' then
                love.graphics.printf('Hello Play State!', 0, 20, VIRTUAL_WIDTH, 'center')
        end
        love.graphics.setFont(scoreFont)
        love.graphics.print(player1Score, VIRTUAL_WIDTH/2  - 50, VIRTUAL_HEIGHT /3)
        love.graphics.print(player2Score, VIRTUAL_WIDTH/2+30, VIRTUAL_HEIGHT/3)
        ball:render()--love.graphics.rectangle('fill', ballX, ballY, 4, 4)
        player1:render() -- paddle1 render() is now a function stored in Paddle.lua
        player2:render()
        --love.graphics.rectangle('fill', 10, player1Y, 5, 20) -- left side
        --love.graphics.rectangle('line', VIRTUAL_WIDTH - 10, player2Y, 5, 20) -- right side

        displayFPS() -- show framerate

        push:apply('end')
end

function love.update(dt)

        if ball:collides(player1) then -- collides() is stored in Ball.lua
                -- deflect the ball to the right
                -- change velocity from -100, to 100
                ball.dx = -ball.dx
        end

        if ball:collides(player2) then
                -- deflect ball to the left
                ball.dx = -ball.dx
        end

        if ball.y <= 0 then -- the top of the screen
                --deflect the ball down
                ball.dy = -ball.dy
                -- reset the ball in the case of it hitting the top of the screen
                ball.y = 0
        end

        if ball.y >= VIRTUAL_HEIGHT - 4 then -- the ball is 4 pixels tall so offset collision by 4 pixels
                ball.dy = -ball.dy
                ball.y = VIRTUAL_HEIGHT - 4
        end
        -- player 1 movement
        if love.keyboard.isDown('w') then
                player1.dy = -PADDLE_SPEED
        elseif love.keyboard.isDown('s') then
                player1.dy = PADDLE_SPEED
        else
                player1.dy = 0 -- if neither is true, the paddle speed is 0
        end
        -- player 2 movement
        if love.keyboard.isDown('up') then
                player2.dy = -PADDLE_SPEED
        elseif love.keyboard.isDown('down') then
                player2.dy = PADDLE_SPEED
        else
                player2.dy = 0
        end
        if gameState == 'play' then
                ball:update(dt)
        end

        player1:update(dt) -- replaces player1Y = math.min(VIRTUAL_HEIGHT - 20, player1Y + PADDLE_SPEED * dt)... now stored in the paddle class and replace player1Y with self.y
        player2:update(dt)
        ball:render()
end
function love.keypressed(key)
        if key == 'escape' then
                love.event.quit()
        elseif key == 'enter' or key == 'return' then
                if gameState == 'start' then
                        gameState = 'play'
                else
                        gameState = 'start'
                        --[[
                                will be copied into ball:reset()
                        ballX = VIRTUAL_WIDTH/2-2
                        ballY = VIRTUAL_HEIGHT/2-2
                        ballDX = math.random(2) == 1 and -100 or 100
                        ballDY = math.random(-50,50)
                        ]]
                        ball:reset()
                end
        end
end

function displayFPS()
        love.graphics.setColor(0,1,0,1) -- toggles color for drawing text... default is white.... RGBT values... could also be 255
        love.graphics.setFont(smallFont)
        love.graphics.print('FPS: ' .. tostring(love.timer.getFPS()), 40, 20) -- .. is the string concatination operator
        -- tostring() will give an integer values which will be incompatible with string
        love.graphics.setColor(1, 1, 1, 1)
end