/**
 * DOOM 3D - Master Game Manager & Application Entry Point
 * Orchestrates loop, state transitions, settings, audio sync, and rendering.
 */

class DoomGame {
    constructor() {
        this.container = document.getElementById('game-container');
        this.state = 'start'; // 'start', 'playing', 'paused', 'gameover'
        
        this.sound = new SoundSystem();
        this.engine = new DoomEngine(this.container);
        this.map = new DoomMap(this.engine, this.sound);
        this.player = new DoomPlayer(this.engine, this.sound);
        this.weapons = new DoomWeapons(this.engine, this.player, this.sound);
        this.enemies = new DoomEnemies(this.engine, this.player, this.sound, this.map);
        this.items = new DoomItems(this.engine, this.player, this.sound, this.map);
        this.hud = new DoomHUD(this.player);
        this.mobile = new DoomMobileControls(this.player);

        this.lastTime = performance.now();
        this.crtFilterEnabled = true;

        this.setupUI();
        this.loop = this.loop.bind(this);
        requestAnimationFrame(this.loop);
    }

    setupUI() {
        // Start Game Button
        const startBtn = document.getElementById('btn-start-game');
        if (startBtn) {
            startBtn.addEventListener('click', () => {
                this.startGame();
            });
        }

        // Restart Game Button
        const restartBtn = document.getElementById('btn-restart');
        if (restartBtn) {
            restartBtn.addEventListener('click', () => {
                this.restartGame();
            });
        }

        // Pause Menu Resume Button
        const resumeBtn = document.getElementById('btn-resume');
        if (resumeBtn) {
            resumeBtn.addEventListener('click', () => {
                this.resumeGame();
            });
        }

        // Settings Modal Open/Close
        const settingsBtn = document.getElementById('btn-settings');
        const settingsModal = document.getElementById('settings-modal');
        const closeSettingsBtn = document.getElementById('btn-close-settings');

        if (settingsBtn && settingsModal) {
            settingsBtn.addEventListener('click', () => {
                settingsModal.classList.remove('hidden');
            });
        }
        if (closeSettingsBtn && settingsModal) {
            closeSettingsBtn.addEventListener('click', () => {
                settingsModal.classList.add('hidden');
            });
        }

        // Settings Sliders
        const sfxSlider = document.getElementById('slider-sfx');
        const musicSlider = document.getElementById('slider-music');
        const sensSlider = document.getElementById('slider-sens');
        const crtCheck = document.getElementById('toggle-crt');

        if (sfxSlider) {
            sfxSlider.addEventListener('input', (e) => {
                this.sound.setSfxVolume(parseFloat(e.target.value));
            });
        }
        if (musicSlider) {
            musicSlider.addEventListener('input', (e) => {
                this.sound.setMusicVolume(parseFloat(e.target.value));
            });
        }
        if (sensSlider) {
            sensSlider.addEventListener('input', (e) => {
                this.player.mouseSensitivity = parseFloat(e.target.value) * 0.002;
            });
        }
        if (crtCheck) {
            crtCheck.addEventListener('change', (e) => {
                this.toggleCRTFilter(e.target.checked);
            });
        }

        // ESC key to toggle pause
        window.addEventListener('keydown', (e) => {
            if (e.code === 'Escape') {
                if (this.state === 'playing') {
                    this.pauseGame();
                } else if (this.state === 'paused') {
                    this.resumeGame();
                }
            }
        });
    }

    startGame() {
        this.state = 'playing';
        const startOverlay = document.getElementById('start-screen');
        if (startOverlay) startOverlay.classList.add('hidden');

        this.sound.init();
        this.player.requestPointerLock();
        this.hud.showNotification('ENTER THE TECH BASE. RIP AND TEAR!');
    }

    pauseGame() {
        this.state = 'paused';
        this.player.exitPointerLock();
        const pauseOverlay = document.getElementById('pause-menu');
        if (pauseOverlay) pauseOverlay.classList.remove('hidden');
    }

    resumeGame() {
        this.state = 'playing';
        const pauseOverlay = document.getElementById('pause-menu');
        if (pauseOverlay) pauseOverlay.classList.add('hidden');
        this.player.requestPointerLock();
    }

    restartGame() {
        this.hud.hideGameOver();
        this.player.respawn(this.map.spawns.player);
        this.state = 'playing';
        this.player.requestPointerLock();
        this.hud.showNotification('RESPAWNED! GET READY TO FIGHT.');
    }

    toggleCRTFilter(enabled) {
        this.crtFilterEnabled = enabled;
        const scanlineElem = document.getElementById('crt-scanlines');
        if (scanlineElem) {
            if (enabled) scanlineElem.classList.remove('hidden');
            else scanlineElem.classList.add('hidden');
        }
    }

    // ----------------------------------------------------
    // MAIN GAME LOOP
    // ----------------------------------------------------

    loop(currentTime) {
        requestAnimationFrame(this.loop);

        const delta = Math.min(0.1, (currentTime - this.lastTime) / 1000.0);
        this.lastTime = currentTime;

        if (this.state === 'playing') {
            // Update all game subsystems
            this.player.update(delta);
            this.map.update(delta);
            this.weapons.update(delta);
            this.enemies.update(delta);
            this.items.update(delta);
            this.engine.update(delta);
            this.hud.update(delta);
        }

        // Always render 3D Scene
        this.engine.render();
    }
}

// Global bootstrap
window.addEventListener('DOMContentLoaded', () => {
    window.game = new DoomGame();
});