/* ============================================================
   SNAKE PROTOCOL — Snake, spaceport energy theme
   ============================================================ */
(function () {
  'use strict';
  const { Game, STATE } = window.DSP;
  const S = window.DSP_SPRITES;

  const W = 800, H = 600;
  const CELL = 20, COLS = 36, ROWS = 24;
  const OX = (W - COLS * CELL) / 2, OY = (H - ROWS * CELL) / 2;

  class SnakeProtocol extends Game {
    constructor(canvas) {
      super({ name: 'snake', title: 'SNAKE PROTOCOL', width: W, height: H, canvas,
        loadSteps: ['BOOTING GRID', 'CHARGING CELLS', 'SYNCING SERPENT', 'SYNCING GRID'] });
      this.grid = null;
      this.snake = [];
      this.dir = { x: 1, y: 0 };
      this.nextDir = { x: 1, y: 0 };
      this.food = null;
      this.special = null;
      this.tickRate = 8;
      this.tickAcc = 0;
      this.grow = 0;
      this.slowTimer = 0;
      this.ghostTimer = 0;
      this.stars = Array.from({ length: 50 }, () => ({ x: Math.random() * W, y: Math.random() * H, s: Math.random() < 0.2 ? 2 : 1 }));
    }
    reset() {
      this.snake = [{ x: 8, y: 12 }, { x: 7, y: 12 }, { x: 6, y: 12 }];
      this.dir = { x: 1, y: 0 };
      this.nextDir = { x: 1, y: 0 };
      this.grow = 0;
      this.slowTimer = 0;
      this.ghostTimer = 0;
      this.tickRate = 8;
      this.placeFood();
      this.special = null;
    }
    placeFood() {
      let p;
      do {
        p = { x: Math.floor(Math.random() * COLS), y: Math.floor(Math.random() * ROWS) };
      } while (this.snake.some(s => s.x === p.x && s.y === p.y));
      this.food = p;
    }
    placeSpecial() {
      let p;
      do {
        p = { x: Math.floor(Math.random() * COLS), y: Math.floor(Math.random() * ROWS) };
      } while (this.snake.some(s => s.x === p.x && s.y === p.y) || (this.food && this.food.x === p.x && this.food.y === p.y));
      this.special = { ...p, kind: Math.random() < 0.5 ? 'bonus' : 'ghost', life: 480 };
    }
    update() {
      const i = this.input;
      if (i.wasPressed('ArrowUp', 'KeyW') && this.dir.y === 0) this.nextDir = { x: 0, y: -1 };
      else if (i.wasPressed('ArrowDown', 'KeyS') && this.dir.y === 0) this.nextDir = { x: 0, y: 1 };
      else if (i.wasPressed('ArrowLeft', 'KeyA') && this.dir.x === 0) this.nextDir = { x: -1, y: 0 };
      else if (i.wasPressed('ArrowRight', 'KeyD') && this.dir.x === 0) this.nextDir = { x: 1, y: 0 };

      if (this.slowTimer > 0) this.slowTimer--;
      if (this.ghostTimer > 0) this.ghostTimer--;
      if (this.special) {
        this.special.life--;
        if (this.special.life <= 0) this.special = null;
      }

      const rate = this.slowTimer > 0 ? this.tickRate + 4 : this.tickRate;
      this.tickAcc++;
      if (this.tickAcc < rate) return;
      this.tickAcc = 0;

      this.dir = this.nextDir;
      const head = { x: this.snake[0].x + this.dir.x, y: this.snake[0].y + this.dir.y };

      if (head.x < 0 || head.x >= COLS || head.y < 0 || head.y >= ROWS) {
        window.DSP_AUDIO.sfx('bigboom');
        this.particles.burst(OX + head.x * CELL + CELL / 2, OY + head.y * CELL + CELL / 2, '#ff4d6d', 20, 3, 30);
        this.shake.trigger(6, 20);
        this.lives--;
        if (this.lives <= 0) { this.gameOver(); return; }
        this.reset();
        return;
      }
      if (this.ghostTimer <= 0 && this.snake.some(s => s.x === head.x && s.y === head.y)) {
        window.DSP_AUDIO.sfx('bigboom');
        this.particles.burst(OX + head.x * CELL + CELL / 2, OY + head.y * CELL + CELL / 2, '#ff4d6d', 20, 3, 30);
        this.shake.trigger(6, 20);
        this.lives--;
        if (this.lives <= 0) { this.gameOver(); return; }
        this.reset();
        return;
      }

      this.snake.unshift(head);

      if (this.food && head.x === this.food.x && head.y === this.food.y) {
        this.addScore(10);
        window.DSP_AUDIO.sfx('eat');
        this.grow += 2;
        this.placeFood();
        if (this.tickRate > 4 && this.score % 50 === 0) {
          this.tickRate--;
          this.level = Math.floor(this.score / 100) + 1;
          window.DSP_AUDIO.sfx('levelup');
        }
        if (Math.random() < 0.25 && !this.special) this.placeSpecial();
      }
      if (this.special && head.x === this.special.x && head.y === this.special.y) {
        if (this.special.kind === 'bonus') {
          this.addScore(50);
          window.DSP_AUDIO.sfx('bonus');
          this.particles.burst(OX + head.x * CELL + CELL / 2, OY + head.y * CELL + CELL / 2, '#ff9d2d', 16, 3, 30);
        } else {
          this.ghostTimer = 300;
          window.DSP_AUDIO.sfx('powerup');
        }
        this.special = null;
      }

      if (this.grow > 0) this.grow--;
      else this.snake.pop();
    }
    render() {
      const ctx = this.ctx;
      ctx.fillStyle = '#05010d';
      ctx.fillRect(0, 0, W, H);
      for (const s of this.stars) {
        ctx.fillStyle = s.s > 1 ? '#7df9ff' : '#2a2145';
        ctx.fillRect(s.x, s.y, s.s, s.s);
      }
      ctx.strokeStyle = '#3a2f5b';
      ctx.lineWidth = 2;
      ctx.strokeRect(OX - 2, OY - 2, COLS * CELL + 4, ROWS * CELL + 4);
      ctx.strokeStyle = 'rgba(58,47,91,0.25)';
      ctx.lineWidth = 1;
      for (let x = 0; x <= COLS; x++) {
        ctx.beginPath(); ctx.moveTo(OX + x * CELL, OY); ctx.lineTo(OX + x * CELL, OY + ROWS * CELL); ctx.stroke();
      }
      for (let y = 0; y <= ROWS; y++) {
        ctx.beginPath(); ctx.moveTo(OX, OY + y * CELL); ctx.lineTo(OX + COLS * CELL, OY + y * CELL); ctx.stroke();
      }
      if (this.food) {
        const fx = OX + this.food.x * CELL, fy = OY + this.food.y * CELL;
        const pulse = 1 + Math.sin(this.time * 0.15) * 0.15;
        ctx.fillStyle = '#ffe14d';
        ctx.fillRect(fx + CELL / 2 - 5 * pulse, fy + CELL / 2 - 5 * pulse, 10 * pulse, 10 * pulse);
      }
      if (this.special) {
        const sx = OX + this.special.x * CELL, sy = OY + this.special.y * CELL;
        const blink = this.special.life < 120 && Math.floor(this.time / 6) % 2 === 0;
        if (!blink) {
          ctx.fillStyle = this.special.kind === 'bonus' ? '#ff9d2d' : '#7df9ff';
          ctx.fillRect(sx + 3, sy + 3, CELL - 6, CELL - 6);
          ctx.fillStyle = '#05010d';
          ctx.font = '10px "Press Start 2P", monospace';
          ctx.textAlign = 'center';
          ctx.fillText(this.special.kind === 'bonus' ? 'B' : 'G', sx + CELL / 2, sy + CELL / 2 + 3);
        }
      }
      const ghost = this.ghostTimer > 0;
      for (let i = this.snake.length - 1; i >= 0; i--) {
        const s = this.snake[i];
        const x = OX + s.x * CELL, y = OY + s.y * CELL;
        if (i === 0) {
          ctx.fillStyle = ghost ? 'rgba(125,249,255,0.5)' : '#7dff5e';
          ctx.fillRect(x + 1, y + 1, CELL - 2, CELL - 2);
          ctx.fillStyle = '#05010d';
          const ex = this.dir.x !== 0 ? (this.dir.x > 0 ? 12 : 4) : 6;
          const ey = this.dir.y !== 0 ? (this.dir.y > 0 ? 12 : 4) : 6;
          ctx.fillRect(x + ex, y + ey, 3, 3);
          ctx.fillRect(x + (CELL - 6 - ex), y + ey, 3, 3);
        } else {
          const t = i / this.snake.length;
          ctx.fillStyle = ghost ? `rgba(125,249,255,${0.5 - t * 0.3})` : `rgba(125,255,94,${1 - t * 0.5})`;
          ctx.fillRect(x + 2, y + 2, CELL - 4, CELL - 4);
        }
      }
    }
  }

  window.DSP_ACTIVE_GAME = new SnakeProtocol(document.getElementById('game'));
  window.DSP_AUDIO.playMusic('snake');
})();