// title:   MorsePit
// author:  He4eT@oddsquat.org
// desc:    Defeat endless waves of enemies using Morse code.
// site:    https://github.com/He4eT/MorsePit
// license: MIT License
// version: 0.1
// script:  js

// api:     https://github.com/nesbox/TIC-80/wiki/API

function TIC() {
  gameStages[currentStage]()
}

// Stages

const gameStages = {
  mainMenu,
  gameover,
  gameplay,
}

let currentStage = 'mainMenu'

// State

let arena = {
  // Screen position
  x: 7,
  y: 7,
  // Bounds
  top: 0,
  right: 225,
  bottom: 89,
  left: 0,
  // Sprite size
  spriteSize: 7,
  spriteHalfSize: 3,
}

let player = {
  sprite: 64,
  speed: 1,
  x: 0,
  y: 0,
}

let enemies = []

// Main Menu

function mainMenu() {
  if ([BTN_A, BTN_B, BTN_X, BTN_Y].map(btn).some(Boolean)) {
    currentStage = 'gameplay'
  }

  cls(0)

  const title = 'Morse Pit'
  print(title, 12, 12, 3, false, 2)

  const instruction = 'Press any key to start'
  print(instruction, 12, 30, 4)
}

// Gameover

function gameover() {
  cls(0)

  drawEnemies()
  drawPlayer()

  const title = 'Game Over'
  print(title, 12, 12, 10, false, 2)
}

// Gameplay

function gameplay() {
  checkColisions()

  handleMoves()
  handleMorse()

  spawn()
  // moveEnemies()

  drawInterface()
  drawArena()
  // drawFX()
  drawEnemies()
  drawPlayer()
}

function handleMoves() {
  player.speed = btn(BTN_A) ? 2 : 1

  let dx = 0
  if (btn(BTN_L)) dx -= 1
  if (btn(BTN_R)) dx += 1

  let dy = 0
  if (btn(BTN_U)) dy -= 1
  if (btn(BTN_D)) dy += 1

  const norm = player.speed / ([dx, dy].every((d) => d !== 0) ? Math.SQRT2 : 1)

  player.x = Math.max(arena.left, Math.min(arena.right, player.x + dx * norm))
  player.y = Math.max(arena.top, Math.min(arena.bottom, player.y + dy * norm))
}

function handleMorse() {
  player.sprite = btn(BTN_B) ? 65 : 64
}

// Enemies

function spawn() {
  if (enemies.length === 0) {
    enemies = [
      {
        x: [100],
        y: [50],
        type: 'zombie',
        dangerZone: 8,
      },
    ]
  }
}

function checkColisions() {
  if (
    enemies
      .map((enemy) => [
        enemy,
        Math.hypot(player.x - enemy.x[0], player.y - enemy.y[0]),
      ])
      .some(([enemy, distance]) => distance < enemy.dangerZone)
  ) {
    currentStage = 'gameover'
  }
}

// Draw

function drawSprite(spriteIndex, x, y) {
  const colorkey = 0
  spr(
    spriteIndex,
    arena.x + x - arena.spriteHalfSize,
    arena.y + y - arena.spriteHalfSize,
    colorkey,
  )
}

function drawInterface() {
  cls(0)
}

function drawArena() {
  map(0, 0, 30, 15)
}

function drawEnemies() {
  enemies
    .map((enemy) => [80, enemy.x[0], enemy.y[0]])
    .forEach((spriteData) => drawSprite(...spriteData))
}

function drawPlayer() {
  drawSprite(player.sprite, player.x, player.y)
}

// Constants

// Buttons
const [BTN_U, BTN_D, BTN_L, BTN_R, BTN_A, BTN_B, BTN_X, BTN_Y] = [
  ...Array(8).keys(),
]

// <TILES>
// 001:1111110012222100123321001233210012222100111111000000000000000000
// 002:1111111112222221123333211233332112222221111111110000000000000000
// 016:0000000000000000000000000000000000000000000001110000012200000123
// 017:0000000000000000000000000000000000000000111111112222222233333333
// 018:0000000000000000000000000000000000000000111000002210000032100000
// 032:0000012300000123000001230000012300000123000001230000012300000123
// 033:2111111111111111111111111111111111111111111111111111111111111111
// 034:3210000032100000321000003210000032100000321000003210000032100000
// 048:0000012300000122000001110000000000000000000000000000000000000000
// 049:3333333322222222111111110000000000000000000000000000000000000000
// 050:3210000022100000111000000000000000000000000000000000000000000000
// 064:8800088080000080008880000088800000888000800000808800088000000000
// 065:0000000008808800080008000008000008000800088088000000000000000000
// 080:aaaaaaa0aaaaaaa0aa000aa0aa000aa0aa000aa0aaaaaaa0aaaaaaa000000000
// </TILES>

// <MAP>
// 000:011111111111111111111111111111111111111111111111111111111121000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 001:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 002:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 003:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 004:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 005:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 006:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 007:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 008:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 009:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 010:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 011:021212121212121212121212121212121212121212121212121212121222000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 012:031313131313131313131313131313131313131313131313131313131323000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// </MAP>

// <WAVES>
// 000:00000000ffffffff00000000ffffffff
// 001:0123456789abcdeffedcba9876543210
// 002:0123456789abcdef0123456789abcdef
// </WAVES>

// <SFX>
// 000:000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000304000000000
// </SFX>

// <TRACKS>
// 000:100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// </TRACKS>

// <PALETTE>
// 000:000000002b36073642586e75657b8383949693a1a1eee8d5b58900cb4b16dc322fd336826c71c4268bd22aa198859900
// </PALETTE>