LÖVE

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push = require 'push'

WINDOW_WIDTH = 1280
WINDOW_HEIGHT = 720

VIRTUAL_WIDTH = 1280
VIRTUAL_HEIGHT = 720

function love.load()
    Object = require "Classic"
    require 'player'
    require 'enemy'
    require 'bullet'

    player = Player()
    enemy = Enemy()
    listofBullets = {}


    love.graphics.setDefaultFilter('nearest', 'nearest')

    title = love.graphics.newFont('fonts/Stars Fighters.ttf', 45)
    start = love.graphics.newFont('fonts/robo.ttf', 30)
    menu = love.graphics.newFont('fonts/robo.ttf', 40)

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

    love.window.setTitle('Titania')

    background = love.graphics.newImage('graphics/space.png')

    gameState = 'start'

    game_paused = false
end

function love.resize(w, h)
    push:resize(w, h)
end

function love.update(dt)
    if game_paused == false then
        player:update(dt)

        for i,v in ipairs(listofBullets) do
            v:update(dt)

            v:checkCollision(enemy)

            if v.dead then
                table.remove(listofBullets, i)
            end
        end
    end

    if gameState == 'play' then
        enemy:update(dt)
    end
end

function love.keypressed(key)
    if key == 'escape' then
        love.event.quit()
    end

    if key == 'enter' or key == 'return' and gameState == 'start' then
        gameState = 'menu'
    end

    if key == 's' and gameState == 'menu' then
        gameState = 'play'
    elseif key == 'h' and gameState == 'menu' then
        gameState = 'help'
    elseif key == 'e' or key == 'escape' and gameState == 'menu' then
        love.event.quit()
    end

    if key == 'backspace' and gameState == 'help' then
        gameState = 'menu'
    end

    if key == 'p' and gameState == 'play' then
        game_paused = true
        gameState = 'pause'
    elseif key == 'p' and gameState == 'pause' then
        game_paused = false
        gameState = 'play'
    end

    player:keypressed(key)
end

function love.draw()
    push:apply('start')

    -- supposed to keep the background scroling??????
    for i = 0, love.graphics.getWidth() / background:getWidth() do
        for j = 0, love.graphics.getHeight() / background:getHeight() do
            love.graphics.draw(background, i * background:getWidth(), j * background:getHeight())
        end
    end

    if gameState == 'start' then
        love.graphics.setFont(title)
        love.graphics.printf('Titania', 0, 30, VIRTUAL_WIDTH, 'center')
        love.graphics.setFont(start)
        love.graphics.printf("Press Enter", 0, 500, VIRTUAL_WIDTH, 'center')
    elseif gameState == 'menu' then
        love.graphics.setFont(title)
        love.graphics.printf('Titania', 0, 30, VIRTUAL_WIDTH, 'center')
        love.graphics.setFont(menu)
        love.graphics.printf("[S]TART    [H]ELP    [E]XIT", 0, 500, VIRTUAL_WIDTH, 'center')
    elseif gameState == 'help' then
        -- draw the player
        player:draw()
        love.graphics.setFont(title)
        love.graphics.printf('Titania', 0, 30, VIRTUAL_WIDTH, 'center')
        love.graphics.setFont(menu)
        love.graphics.printf("Use the ARROW keys or WASD to move and SPACE to shoot", 0, 500, VIRTUAL_WIDTH, 'center')
    elseif gameState == 'play' then
        -- draw the player
        player:draw()
        -- draw the enemy
        enemy:draw()
        -- text
        love.graphics.setFont(title)
        love.graphics.printf('TEST WAVE 1', 0, 30, VIRTUAL_WIDTH, 'center')
    elseif gameState == 'pause' then
        player:draw()
        enemy:draw()
        love.graphics.setFont(title)
        love.graphics.printf('PAUSE', 0, 250, VIRTUAL_WIDTH, 'center')
    end

    for i,v in ipairs(listofBullets) do
        v:draw()
    end

    push:apply('end')
end

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Enemy = Object:extend()

function Enemy:new()
    self.image = love.graphics.newImage('graphics/blueship.png')

    -- table function??? 
    enemy = {}

    --[[
        this will likely be changed from "timer" to "wave" when I find the 
        proper way to implement the idea
    ]]

    self.timer = 0
    self.timerLim = 2 --math.random(1, 3)
    self.amount = 4 --math.random(2, 5)
    self.side = math.random(1, 4)


    self.x = 300
    self.y = 20
    self.speed = 300
    self.width = self.image:getWidth()
    self.height = self.image:getHeight()
    self.xvel = 0
    self.yvel = 0
    self.friction = 10
    self.health = 1

end

function Enemy:update(dt)
    --self.x = self.x + self.speed * dt -- you commented this out to test stuff
    local window_width = love.graphics.getWidth()
    local window_height = love.graphics.getHeight()

    --[[
        this should assist with generating multiple enemies on the screen.
        hopefully we'll be able to make them "fly in" from the top of the screen...

        for now, they spawn from all over the place
    ]]
    self.timer = self.timer + dt
    if self.timer > self.timerLim then
        --spawn the enemy
        for i = 1,self.amount do
            if self.side == 1 then -- LEFT
                enemy:spawn(-self.height, window_height / 2 - (self.height / 2))
            end
            if self.side == 2 then -- TOP
                enemy:spawn(window_width / 2 - (self.width / 2), -self.height)
            end
            if self.side == 3 then -- RIGHT
                enemy:spawn(window_width, window_height / 2 - (self.height / 2))
            end
            if self.side == 4 then -- BOTTOM
                enemy:spawn(window_width / 2 - (self.width / 2), window_height)
            end
            self.side = math.random(1, 4)
        end
        self.timerLim = 2 --math.random(1, 3)
        self.timer = 0
        self.amount = 4 --math.random(2, 5)
    end
    --[[
        this whole setup here establishes the enemy tracking the player
        currently the enemy follows the player pretty aggressively
        we'll fix that later... 
    ]]
    for i,v in ipairs(enemy) do
        self.x = self.x + self.xvel * dt
        self.y = self.y + self.yvel * dt
        self.xvel = self.xvel * (1 - math.min(dt * self.friction, 1))
        self.yvel = self.yvel * (1 - math.min(dt * self.friction, 1))
    end

    for i,v in ipairs(enemy) do
        -- TRACK X AXIS
        if player.x + player.width / 2 < self.x + self.width / 2 then
            if self.xvel > -self.speed then
                self.xvel = self.xvel - self.speed * dt
            end
        elseif player.x + player.width / 2 > self.x + self.width / 2 then
            if self.xvel < self.speed then
                self.xvel = self.xvel + self.speed * dt
            end
        end
        -- TRACK THE Y AXIS
        if player.y + player.height / 2 < self.y + self.height / 2 then
            if self.yvel > -self.speed then
                self.yvel = self.yvel - self.speed * dt
            end
        elseif player.y + player.height / 2 > self.y + self.height / 2 then
            if self.yvel < self.speed then
                self.yvel = self.yvel + self.speed * dt
            end
        end
    end
end

function Enemy:spawn(x, y)
    table.insert(enemy, {x = x, y = y, self.xvel, self.yvel, self.health})
end

function Enemy:draw()
    for i,v in ipairs(enemy) do
        love.graphics.draw(self.image, self.x, self.y)
    end
end

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function love.load()
  listOfEnemies = {}
  -- ...rest
end  

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table.insert(listOfEnemies, Enemy())

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function Enemy:new(x,y)
  -- ...
  self.x = x or 300 -- the 'or' here will make self.x become 300 if nothing is passed to the constructor, the value of x otherwise
  self.y = y or 20
  -- ...
end

Enemy(10,0) -- spawns an enemy at x:10, y:0
Enemy() -- spawns an enemy at x:300, y:20

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local waveTimer = 0
function love.update()
  waveTimer = waveTimer + 1
  if waveTimer == 300 then
    -- for this wave spawn ten enemies spaced ten pixels apart both horizontall and vertically
    for i = 1, 10 do
      table.insert(listOfEnemies, Enemy(10+i*10, 20-i*10))
    end
  end
end