Class = require 'class'
push = require 'push'

require 'Paddle'
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()) -- we want to decide on a velocity for the ball. math.random() will help. we must first seed the random number generator and we need to give it a value to actually seed. we give it os.time()
    -- is tied to use of math.random()
    love.graphics.setDefaultFilter('nearest', 'nearest')
    love.window.setTitle('Pong')
    smallFont= love.graphics.newFont('Retro Gaming.ttf', 8) -- creates a font object

    scoreFont = love.graphics.newFont('Retro Gaming.ttf', 12)
    victoryFont = love.graphics.newFont('Retro Gaming.ttf', 30)

    fpsFont = love.graphics.newFont()

    player1Score = 0
    player2Score = 0

    servingPlayer = math.random() == 1 and 1 or 2 -- a coin flip that will return 1 or 2

    winningPlayer = 0


    love.graphics.setFont(smallFont)

    sounds = { -- a table with 3 audio objects
        ['paddle_hit'] = love.audio.newSource('Paddle_Hit.wav', 'static'),
        ['point_scored'] = love.audio.newSource('Point_scored.wav', 'static'),
        ['wall_hit'] = love.audio.newSource('Wall_Hit.wav', 'static'),
    }

    push:setupScreen(VIRUTAL_WIDTH, VIRTUAL_HEIGHT, WINDOW_WIDTH, WINDOW_HEIGHT, {
        fullscreen = false,
        resizeable = true,
        vsync = true
         -- resizeable must now be true in order for the window to be able to resize
        --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)

    if servingPlayer == 1 then
        ball.dx = 100
    else
        ball.dx = -100
    end



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




end

function love.resize(w, h)
    push:resize(w, h) -- you can pass in arguments to resize with arguments w, and h
end

function love.update(dt)
    if gameState == 'play' then

        if ball.x < 0 then
            player2Score = player2Score + 1
            servingPlayer = 1
            sounds['point_scored']:play()

            if player2Score >= 3 then
                gameState = 'victory'
                winningPlayer = 2 -- winning player isn't displayed
            else
                gameState = 'serve'
                ball:reset()
            end

        end

        if ball.x >= VIRUTAL_WIDTH - 4 then
            player1Score = player1Score + 1
            servingPlayer = 2

            sounds['point_scored']:play()
            if player1Score >= 3 then
                gameState = 'victory'
                winningPlayer = 1 -- winning player message isn't displayed
            else
                gameState = 'serve'
                ball:reset()
            end


        end

        if ball:collides(player1) then

            ball.dx = -ball.dx * 1.03
            ball.x = player1.x + 5

            sounds['paddle_hit']:play() -- colon is important because it's an object
            if ball.dy < 0 then
                ball.dy = -math.random(10, 150)
            else
                ball.dy = math.random(10, 150)
            end
        end

        if ball:collides(player2) then

            ball.dx = -ball.dx

            sounds['paddle_hit']:play()
        end


        if ball.y <= 0 then
            ball.dy = -ball.dy -- deflect the ball down
            ball.y = 0 -- we want to reset the ball into the playfield in the case that it hit the top of the screen

            sounds['wall_hit']:play()
        end

        if ball.y >= VIRTUAL_HEIGHT - 4 then
            ball.dy = -ball.dy
            ball.y = VIRTUAL_HEIGHT - 4 -- in the case that it hits the bottom of the screen
            sounds['wall_hit']:play()
        end



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


        else
            player1.dy = 0
        end


        player2.y = ball.y -10000000000*dt*player2.dy -- i'm trying to make my opponent less impossible to beat

        if gameState == 'play' then
            ball:update(dt)
            --ballX = ballX + ballDX * dt
            --ballY = ballY + ballDY * dt
        end
        player1:update(dt)
        player2:update(dt)
    end
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'
            gameState = 'serve'
        elseif gameState == 'victory' then
            gameState = 'start'
            player2Score = 0
            player1Score = 0
        elseif gameState == 'serve' then
            gameState = 'play'
        end
    end
end

function love.draw()
    push:apply('start')
    love.graphics.clear(40/255, 45/255, 52/255, 255/255)
    love.graphics.setFont(smallFont)
    love.graphics.setFont(scoreFont)
    if gameState == 'start' then
        love.graphics.printf("Welcome to Pong!", 0, 20, VIRUTAL_WIDTH, 'center')
        love.graphics.printf("press enter to play", 0, 32, VIRUTAL_WIDTH, 'center')
    elseif gameState == 'serve' then
        --love.graphics.setFont(smallFont)
        love.graphics.printf("Player " .. tostring(servingPlayer) .. "'s serve!", 0, 20, VIRUTAL_WIDTH, 'center') -- neither will happen during play state
        love.graphics.printf("Press enter to serve", 0, 32, VIRUTAL_WIDTH, 'center')
    elseif gamestate == 'victory' then
        -- draw a victory message
        love.graphics.setFont(victoryFont)
        love.graphics.printf("Player " .. tostring(winningPlayer) .. " Wins!", 0, 10, VIRUTAL_WIDTH, 'center')
        love.graphics.printf("Press enter to serve", 0, 42, VIRUTAL_WIDTH, 'center')
        love.graphics.setFont(smallFont)
    elseif gameState == 'play' then
        -- no UI messages to display in play
    end

    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

-- resize application
--[[
    love.resize(width, height)
        LÖVE will pass width and height to push -- this doesn't work... but worry about it later

        your assignment is to create a basic ai to play against the first player
        make it as easy or difficult as you wish
        make sure the tracking movement is smooth and not instantaneous
]]