Class = require 'class'
push = require 'push' -- push is a library that will allow us to draw our game at a virtual resolution. in order to get it to work you need to import the library

require 'Paddle' -- because of the order that we are declaring the variables, require ball and paddle will have access to the class variable. if you don't specify local it will be accessible anywhere in the app
require 'Ball'

WINDOW_WIDTH = 1280
WINDOW_HEIGHT = 720

VIRUTAL_WIDTH = 432
VIRTUAL_HEIGHT = 243

PADDLE_SPEED = 200


push = require 'push'

function love.load()
    math.randomseed(os.time())
    love.graphics.setDefaultFilter('nearest', 'nearest')
    smallFont= love.graphics.newFont('Retro Gaming.ttf', 8) -- creates a font object

    scoreFont = love.graphics.newFont('Retro Gaming.ttf', 12)

    fpsFont = love.graphics.newFont()

    player1Score = 0
    player2Score = 0

    love.graphics.setFont(smallFont)
    push:setupScreen(VIRUTAL_WIDTH, VIRTUAL_HEIGHT, WINDOW_WIDTH, WINDOW_HEIGHT, {
        fullscreen = false,
        vsync = true,
        resizeable = false
    })

    player1 = Paddle(5, 20, 5, 20) -- construct a new paddle... it will call the init method implicitly
    player2 = Paddle(VIRUTAL_WIDTH - 10, VIRTUAL_HEIGHT - 30, 5, 20)
    ball = Ball(VIRUTAL_WIDTH/2-2, VIRTUAL_HEIGHT/2-2, 5, 5)

    gameState = 'play' -- should gamestate be start or play? try both




end

function love.update(dt)
    if ball:collides(player1) then
        --deflect to the right
        ball.dx = -ball.dx -- only dx needs to be flipped
    end

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


    if ball.y <= 0 then
        ball.dy = -ball.dy
        ball.y = 0
    end

    if ball.y >= VIRTUAL_HEIGHT - 4 then
        ball.dy = -ball.dy
        ball.y = VIRTUAL_HEIGHT
    end



    if love.keyboard.isDown('w') then
        player1.dy = -PADDLE_SPEED
    elseif love.keyboard.isDown('s') then
        player2.dy = PADDLE_SPEED


    else
        player1.dy = 0
    end
    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)
    player2:update(dt)
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'
            ball:reset()
        end
    end
end

function love.draw()
    push:apply('start')
    love.graphics.clear(40/255, 45/255, 52/255, 255/255)
    love.graphics.setFont(smallFont)

    if gameState == 'start' then
        love.graphics.printf("Hello Start State!", 0, 20, VIRUTAL_WIDTH, 'center')
    elseif gameState == 'play' then
        love.graphics.printf('Hello Play State!', 0, 20 , VIRUTAL_WIDTH, 'center')
    end
    love.graphics.setFont(scoreFont)
    love.graphics.print(player1Score, VIRUTAL_WIDTH/2-50, VIRTUAL_HEIGHT/3)
    love.graphics.print(player2Score, VIRUTAL_WIDTH/2 + 30, VIRTUAL_HEIGHT/3)


    --love.graphics.rectangle('fill', ballX, ballY, 5, 5) -- ball
    player1:render()
    player2:render()

    ball:render()

    displayFPS()
    push:apply('end')

end

function displayFPS()
    love.graphics.setColor(0,255,0)
    love.graphics.setFont(fpsFont, 10)
    love.graphics.print('fps:' .. tostring(love.timer.getFPS()), 40, 20) -- the tostring() method will give an ineger value. .. is the string concatination operator in lua
    love.graphics.setColor(1, 1, 1, 1) -- set everything back to white as the default color for whenever it draws anything else like the badle or ball
end