WINDOW_WIDTH = 1280
WINDOW_HEIGHT = 720

VIRTUAL_WIDTH = 432
VIRTUAL_HEIGHT = 243

PADDLE_SPEED = 200

Class = require 'class' -- from Paddle.lua... require the line    Paddle = Class{}


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')


         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!


         gameState = 'start'
         smallFont = love.graphics.newFont('TitilliumText22L005-webfont.ttf',10)
         scoreFont = love.graphics.newFont('04B_30__.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

        servingPlayer = math.random(2) == 1 and 1 or 2 -- a coin flip between 1 and 2 which 1 is true and which is false

        winningPlayer = 0

        if servingPlayer == 1 then
                ball.dx = 100
        else
                ball.dx = -100
        end
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('lsansd.ttf',20)
        love.graphics.setFont(smallFont)

        displayScore()

        if gamestate == 'start' then
                love.graphics.printf("Welcome to Pong!", 0, 20, VIRTUAL_WIDTH, 'center') -- it starts at the left edge, and the column size is virualwidth with center text
                love.graphics.printf("Press Enter to Play!", 0, 32, VIRTUAL_WIDTH, 'center')
        elseif gameState == 'serve' then
                love.graphics.printf("Player" .. tostring(servingPlayer) .. "'s turn!", 0, 30, VIRTUAL_WIDTH, 'center') -- always says serving player 2... why?
                love.graphics.printf("Press Enter to Serve", 0, 20, VIRTUAL_WIDTH, 'center')
        elseif gameState == 'victory' then
                love.graphics.setFont(victoryFont)
                love.graphics.printf("Player" .. tostring(winningPlayer) .. " wins!", 0, 30, VIRTUAL_WIDTH, 'center') -- always says serving player 2... why?
                love.graphics.printf('', 0, 42, VIRTUAL_WIDTH, 'center')
        elseif gameState == 'play' then

        end


        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()

        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

        if ball.x < 0 then
                player2Score = player2Score + 1
                serveringPlayer = 1 -- serving player isn't displayed correctly ... ask reddit!
                ball:reset() -- randomizes the balls dx. we want to set that based on who scored
                if player2Score >= 10 then
                        gameState = 'victory'
                        winningPlayer = 2
                else
                        gameState = 'serve'
                end
                -- if player2's score got incremented... player1 should serve
                -- ball.dx = 100 -- it will go towards player 2 put it back maybe...
                --gameState = 'serve'
        end

        if ball.x > VIRTUAL_WIDTH then
                player1Score = player1Score + 1 -- serving player not working... always says serving player 2
                servingPlayer = 2
                ball:reset()
                --ball.dx = -100
                --gameState = 'serve'
                if player1Score >= 3 then
                        gameState = 'victory'
                        winningPlayer = 1
                else
                        gameState = 'serve'
        end

        -- player 1 movement
        if love.keyboard.isDown('w') then
                player1.dy = -PADDLE_SPEED -- negative is up
        elseif love.keyboard.isDown('s') then
                player1.dy = PADDLE_SPEED -- replaces math.min(VIRTUAL_HEIGHT - 2-,PLAYER1Y + PADDLE_SPEED * dt)
        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)
                --ballX = ballX + ballDX * dt   these will instead be done with update
                --ballY = ballY + ballDY * 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()
        --end
        elseif key == 'enter' or key == 'return' then
                if gameState == 'start' then
                        gameState = 'serve'
                elseif gameState == 'victory' then
                        gameState == 'start'
                elseif gameState == 'serve' then
                        gameState = 'play'
                        --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