// BootScene – runs once at startup to generate all shared textures, then hands
// off to MenuScene.  Textures live in Phaser's global TextureManager so every
// subsequent scene can use them without re-creating them.

export default class BootScene extends Phaser.Scene {
    constructor() {
        super({ key: 'BootScene' });
    }

    create() {
        this._createTextures();
        this.scene.start('MenuScene');
    }

    // ─── Texture Generation ───────────────────────────────────────────────────

    _createTextures() {
        // Player ship – 64×32, nose points right (angle 0)
        let g = this.make.graphics({ add: false });
        g.lineStyle(2, 0x00ff44, 1);
        g.strokeTriangle(56, 16, 12, 4, 12, 28);
        g.generateTexture('player', 64, 32);
        g.destroy();

        // Player ship with thruster flame
        g = this.make.graphics({ add: false });
        g.lineStyle(2, 0x00ff44, 1);
        g.strokeTriangle(56, 16, 12, 4, 12, 28);
        g.lineStyle(2, 0xff6600, 1);
        g.strokeTriangle(12, 11, 12, 21, 0, 16);
        g.generateTexture('player_thrust', 64, 32);
        g.destroy();

        // Large asteroid – 120×120, radius 50, 12-sided
        g = this.make.graphics({ add: false });
        g.lineStyle(2, 0xcccccc, 1);
        g.strokePoints(this._asteroidPoints(60, 60, 50, 12,
            [1.0, 0.82, 1.08, 0.88, 1.0, 0.78, 1.1, 0.9, 0.94, 1.0, 0.84, 1.06]
        ), true);
        g.generateTexture('asteroid_large', 120, 120);
        g.destroy();

        // Medium asteroid – 64×64, radius 26, 10-sided
        g = this.make.graphics({ add: false });
        g.lineStyle(2, 0xcccccc, 1);
        g.strokePoints(this._asteroidPoints(32, 32, 26, 10,
            [1.0, 0.78, 1.1, 0.88, 1.0, 0.82, 1.0, 0.92, 1.06, 0.80]
        ), true);
        g.generateTexture('asteroid_medium', 64, 64);
        g.destroy();

        // Small asteroid – 32×32, radius 12, 8-sided
        g = this.make.graphics({ add: false });
        g.lineStyle(2, 0xcccccc, 1);
        g.strokePoints(this._asteroidPoints(16, 16, 12, 8,
            [1.0, 0.78, 1.12, 0.84, 1.0, 0.9, 0.80, 1.04]
        ), true);
        g.generateTexture('asteroid_small', 32, 32);
        g.destroy();

        // Alien saucer – 64×48
        g = this.make.graphics({ add: false });
        g.lineStyle(2, 0x00ffff, 1);
        g.strokeEllipse(32, 30, 52, 20);
        g.strokeEllipse(32, 22, 30, 18);
        g.generateTexture('alien', 64, 48);
        g.destroy();

        // Player bullet – 8×8 yellow circle
        g = this.make.graphics({ add: false });
        g.fillStyle(0xffff00, 1);
        g.fillCircle(4, 4, 4);
        g.generateTexture('bullet', 8, 8);
        g.destroy();

        // Alien bullet – 8×8 red circle
        g = this.make.graphics({ add: false });
        g.fillStyle(0xff4444, 1);
        g.fillCircle(4, 4, 4);
        g.generateTexture('alien_bullet', 8, 8);
        g.destroy();
    }

    _asteroidPoints(cx, cy, radius, numPoints, offsets) {
        return offsets.map((scale, i) => {
            const angle = (i / numPoints) * Math.PI * 2;
            return {
                x: cx + Math.cos(angle) * radius * scale,
                y: cy + Math.sin(angle) * radius * scale
            };
        });
    }
}