import * as THREE from 'three';
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';

// 게임 상수
const GAME_CONSTANTS = {
    MISSION_DURATION: 180,
    MAP_SIZE: 15000,
    MAX_ALTITUDE: 12000,
    MIN_ALTITUDE: 100,
    MAX_SPEED: 800,
    STALL_SPEED: 120,
    GRAVITY: 9.8,
    MOUSE_SENSITIVITY: 0.001,
    MAX_G_FORCE: 12.0,
    ENEMY_COUNT: 4,
    MISSILE_COUNT: 6,
    AMMO_COUNT: 300
};

// 전투기 클래스
class Fighter {
    constructor() {
        this.mesh = null;
        this.isLoaded = false;
        
        // 물리 속성
        this.position = new THREE.Vector3(0, 2000, 0);
        this.velocity = new THREE.Vector3(0, 0, 150);
        this.acceleration = new THREE.Vector3(0, 0, 0);
        this.rotation = new THREE.Euler(0, 0, 0);
        
        // 비행 제어
        this.baseSpeed = 150;
        this.throttle = 0.5;
        this.speed = 150;
        this.altitude = 2000;
        this.gForce = 1.0;
        this.health = 100;
        
        // 조종 입력 시스템
        this.pitchInput = 0;
        this.rollInput = 0;
        this.yawInput = 0;
        
        // 마우스 누적 입력
        this.mousePitch = 0;
        this.mouseRoll = 0;
        
        // 부드러운 회전을 위한 목표값
        this.targetPitch = 0;
        this.targetRoll = 0;
        this.targetYaw = 0;
        
        // 무기
        this.missiles = GAME_CONSTANTS.MISSILE_COUNT;
        this.ammo = GAME_CONSTANTS.AMMO_COUNT;
        this.bullets = [];
        this.lastShootTime = 0;
        
        // 카메라 설정
        this.cameraDistance = 260;
        this.cameraHeight = 45;
        this.cameraLag = 0.1;
    }

    async initialize(scene, loader) {
        try {
            const result = await loader.loadAsync('models/f-15.glb');
            this.mesh = result.scene;
            this.mesh.position.copy(this.position);
            this.mesh.scale.set(2, 2, 2);
            
            // 모델 방향 조정 (45도 회전)
            this.mesh.rotation.y = Math.PI / 4; // 45도 회전
            
            // 그림자 설정
            this.mesh.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                }
            });
            
            scene.add(this.mesh);
            this.isLoaded = true;
            
            console.log('F-15 전투기 로딩 완료');
        } catch (error) {
            console.error('F-15 모델 로딩 실패:', error);
            this.createFallbackModel(scene);
        }
    }

    createFallbackModel(scene) {
        const group = new THREE.Group();
        
        // 동체 - Z축 방향으로 생성하여 앞을 향하게 함
        const fuselageGeometry = new THREE.CylinderGeometry(0.8, 1.5, 12, 8);
        const fuselageMaterial = new THREE.MeshLambertMaterial({ color: 0x606060 });
        const fuselage = new THREE.Mesh(fuselageGeometry, fuselageMaterial);
        fuselage.rotation.x = Math.PI / 2; // X축으로 90도 회전하여 머리가 앞을 향하게 함
        group.add(fuselage);
        
        // 주익
        const wingGeometry = new THREE.BoxGeometry(16, 0.3, 4);
        const wingMaterial = new THREE.MeshLambertMaterial({ color: 0x404040 });
        const wings = new THREE.Mesh(wingGeometry, wingMaterial);
        wings.position.z = -1;
        group.add(wings);
        
        // 수직 안정판
        const tailGeometry = new THREE.BoxGeometry(0.3, 4, 3);
        const tailMaterial = new THREE.MeshLambertMaterial({ color: 0x404040 });
        const tail = new THREE.Mesh(tailGeometry, tailMaterial);
        tail.position.z = -5;
        tail.position.y = 1.5;
        group.add(tail);
        
        // 수평 안정판
        const horizontalTailGeometry = new THREE.BoxGeometry(6, 0.2, 2);
        const horizontalTail = new THREE.Mesh(horizontalTailGeometry, tailMaterial);
        horizontalTail.position.z = -5;
        horizontalTail.position.y = 0.5;
        group.add(horizontalTail);
        
        this.mesh = group;
        this.mesh.position.copy(this.position);
        this.mesh.scale.set(2, 2, 2);
        scene.add(this.mesh);
        this.isLoaded = true;
        
        console.log('Fallback 전투기 모델 생성 완료');
    }

    updateMouseInput(deltaX, deltaY) {
        this.mouseRoll += deltaX * GAME_CONSTANTS.MOUSE_SENSITIVITY;
        this.mousePitch += deltaY * GAME_CONSTANTS.MOUSE_SENSITIVITY;
        
        this.mouseRoll = Math.max(-1, Math.min(1, this.mouseRoll));
        this.mousePitch = Math.max(-1, Math.min(1, this.mousePitch));
    }

    updateControls(keys, deltaTime) {
        if (keys.w) {
            this.throttle = Math.min(1.0, this.throttle + deltaTime * 0.8);
        }
        if (keys.s) {
            this.throttle = Math.max(0.1, this.throttle - deltaTime * 0.8);
        }
        
        this.yawInput = 0;
        if (keys.a) this.yawInput = -0.5;
        if (keys.d) this.yawInput = 0.5;
        
        this.pitchInput = this.mousePitch;
        this.rollInput = this.mouseRoll;
        
        const maxPitchAngle = Math.PI / 6;
        const maxRollAngle = Math.PI / 4;
        
        this.targetPitch = this.pitchInput * maxPitchAngle;
        this.targetRoll = this.rollInput * maxRollAngle;
        this.targetYaw += this.yawInput * deltaTime * 1.5;
        
        this.mouseRoll *= 0.95;
        this.mousePitch *= 0.95;
    }

    updatePhysics(deltaTime) {
        if (!this.mesh) return;
        
        const rotationSpeed = deltaTime * 3.0;
        this.rotation.x = THREE.MathUtils.lerp(this.rotation.x, this.targetPitch, rotationSpeed);
        this.rotation.y = THREE.MathUtils.lerp(this.rotation.y, this.targetYaw, rotationSpeed);
        this.rotation.z = THREE.MathUtils.lerp(this.rotation.z, this.targetRoll, rotationSpeed);
        
        const minSpeed = 100;
        const maxSpeed = 300;
        const targetSpeed = minSpeed + (maxSpeed - minSpeed) * this.throttle;
        
        this.speed = THREE.MathUtils.lerp(this.speed, targetSpeed, deltaTime * 2);
        
        const forward = new THREE.Vector3(0, 0, 1);
        forward.applyEuler(this.rotation);
        
        this.velocity = forward.multiplyScalar(this.speed);
        
        this.position.add(this.velocity.clone().multiplyScalar(deltaTime));
        
        if (this.position.y < GAME_CONSTANTS.MIN_ALTITUDE) {
            this.position.y = GAME_CONSTANTS.MIN_ALTITUDE;
            if (this.velocity.y < 0) this.velocity.y = 0;
        }
        
        if (this.position.y > GAME_CONSTANTS.MAX_ALTITUDE) {
            this.position.y = GAME_CONSTANTS.MAX_ALTITUDE;
            if (this.velocity.y > 0) this.velocity.y = 0;
        }
        
        const mapLimit = GAME_CONSTANTS.MAP_SIZE / 2;
        if (this.position.x > mapLimit) this.position.x = -mapLimit;
        if (this.position.x < -mapLimit) this.position.x = mapLimit;
        if (this.position.z > mapLimit) this.position.z = -mapLimit;
        if (this.position.z < -mapLimit) this.position.z = mapLimit;
        
        // 메시 업데이트 시 물리 회전과 모델 회전을 조합
        this.mesh.position.copy(this.position);
        
        // 모델의 기본 회전(270도)에 물리 회전을 더함
        this.mesh.rotation.x = this.rotation.x;
        this.mesh.rotation.y = this.rotation.y + 3 * Math.PI / 2; // 기본 270도 회전 유지
        this.mesh.rotation.z = this.rotation.z;
        
        this.altitude = this.position.y;
        
        const rotationIntensity = Math.abs(this.targetPitch) + Math.abs(this.targetRoll);
        this.gForce = 1.0 + rotationIntensity * 3;
    }

    shoot(scene) {
        const currentTime = Date.now();
        if (currentTime - this.lastShootTime < 100 || this.ammo <= 0) return;
        
        this.lastShootTime = currentTime;
        this.ammo--;
        
        const bulletGeometry = new THREE.SphereGeometry(0.2);
        const bulletMaterial = new THREE.MeshBasicMaterial({ 
            color: 0xffff00,
            emissive: 0xffff00,
            emissiveIntensity: 0.7
        });
        const bullet = new THREE.Mesh(bulletGeometry, bulletMaterial);
        
        // 총구 위치 계산 (전투기 앞쪽)
        const muzzleOffset = new THREE.Vector3(0, 0, 8);
        muzzleOffset.applyEuler(this.rotation);
        bullet.position.copy(this.position).add(muzzleOffset);
        
        const bulletSpeed = 1000;
        const direction = new THREE.Vector3(0, 0, 1);
        direction.applyEuler(this.rotation);
        bullet.velocity = direction.multiplyScalar(bulletSpeed).add(this.velocity);
        
        scene.add(bullet);
        this.bullets.push(bullet);
        
        // 발사음 (에러 방지)
        try {
            const audio = new Audio('sounds/gunfire.ogg');
            if (audio) {
                audio.volume = 0.3;
                audio.play().catch(e => console.log('Gunfire sound failed to play'));
            }
        } catch (e) {
            // 조용히 무시
        }
    }

    updateBullets(scene, deltaTime) {
        for (let i = this.bullets.length - 1; i >= 0; i--) {
            const bullet = this.bullets[i];
            bullet.position.add(bullet.velocity.clone().multiplyScalar(deltaTime));
            
            if (bullet.position.distanceTo(this.position) > 8000 || 
                bullet.position.y < 0 || 
                bullet.position.y > GAME_CONSTANTS.MAX_ALTITUDE + 500) {
                scene.remove(bullet);
                this.bullets.splice(i, 1);
            }
        }
    }

    takeDamage(damage) {
        this.health -= damage;
        return this.health <= 0;
    }

    // 수정된 카메라 위치 계산 (워썬더 스타일)
    getCameraPosition() {
        // 전투기의 현재 회전을 고려한 뒤쪽 방향 계산
        const backward = new THREE.Vector3(0, 0, -1);
        backward.applyEuler(this.rotation);
        
        // 월드 좌표계의 위쪽 방향 (전투기 회전에 영향받지 않음)
        const worldUp = new THREE.Vector3(0, 1, 0);
        
        // 카메라 위치 = 전투기 위치 + (뒤쪽 방향 * 거리) + (월드 위쪽 * 높이)
        const cameraPos = this.position.clone()
            .add(backward.multiplyScalar(this.cameraDistance))
            .add(worldUp.multiplyScalar(this.cameraHeight));
            
        return cameraPos;
    }

    getCameraTarget() {
        // 전투기가 향하는 방향의 앞쪽을 바라보도록 설정
        const forward = new THREE.Vector3(0, 0, 1);
        forward.applyEuler(this.rotation);
        
        // 전투기 위치에서 앞쪽 방향으로 일정 거리만큼 떨어진 지점을 타겟으로 설정
        return this.position.clone().add(forward.multiplyScalar(100));
    }
}

// 적 전투기 클래스
class EnemyFighter {
    constructor(scene, position) {
        this.mesh = null;
        this.isLoaded = false;
        this.scene = scene;
        this.position = position.clone();
        this.velocity = new THREE.Vector3(0, 0, 120);
        this.rotation = new THREE.Euler(0, 0, 0);
        this.health = 100;
        this.speed = 120;
        this.bullets = [];
        this.lastShootTime = 0;
        
        this.aiState = 'patrol';
        this.targetPosition = position.clone();
        this.patrolCenter = position.clone();
        this.patrolRadius = 2000;
        this.lastStateChange = 0;
    }

    async initialize(loader) {
        try {
            const result = await loader.loadAsync('models/mig-29.glb');
            this.mesh = result.scene;
            this.mesh.position.copy(this.position);
            this.mesh.scale.set(1.5, 1.5, 1.5);
            
            // 적 전투기도 270도 회전
            this.mesh.rotation.y = 3 * Math.PI / 2;
            
            this.mesh.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                }
            });
            
            this.scene.add(this.mesh);
            this.isLoaded = true;
            
            console.log('MiG-29 적기 로딩 완료');
        } catch (error) {
            console.error('MiG-29 모델 로딩 실패:', error);
            this.createFallbackModel();
        }
    }

    createFallbackModel() {
        const group = new THREE.Group();
        
        const fuselageGeometry = new THREE.CylinderGeometry(0.6, 1.0, 8, 8);
        const fuselageMaterial = new THREE.MeshLambertMaterial({ color: 0x800000 });
        const fuselage = new THREE.Mesh(fuselageGeometry, fuselageMaterial);
        fuselage.rotation.x = -Math.PI / 2; // 동일한 방향 조정
        group.add(fuselage);
        
        const wingGeometry = new THREE.BoxGeometry(12, 0.3, 3);
        const wingMaterial = new THREE.MeshLambertMaterial({ color: 0x600000 });
        const wings = new THREE.Mesh(wingGeometry, wingMaterial);
        wings.position.z = -0.5;
        group.add(wings);
        
        this.mesh = group;
        this.mesh.position.copy(this.position);
        this.mesh.scale.set(1.5, 1.5, 1.5);
        this.scene.add(this.mesh);
        this.isLoaded = true;
        
        console.log('Fallback 적기 모델 생성 완료');
    }

    update(playerPosition, deltaTime) {
        if (!this.mesh || !this.isLoaded) return;
        
        const currentTime = Date.now();
        const distanceToPlayer = this.position.distanceTo(playerPosition);
        
        if (distanceToPlayer < 5000) {
            const direction = new THREE.Vector3()
                .subVectors(playerPosition, this.position)
                .normalize();
            
            this.velocity = direction.multiplyScalar(this.speed);
            this.rotation.y = Math.atan2(direction.x, direction.z);
            
            if (distanceToPlayer < 2000 && currentTime - this.lastShootTime > 1500) {
                this.shoot();
            }
        } else {
            if (this.position.distanceTo(this.targetPosition) < 300) {
                const angle = Math.random() * Math.PI * 2;
                this.targetPosition = this.patrolCenter.clone().add(
                    new THREE.Vector3(
                        Math.cos(angle) * this.patrolRadius,
                        (Math.random() - 0.5) * 1000,
                        Math.sin(angle) * this.patrolRadius
                    )
                );
            }
            
            const direction = new THREE.Vector3()
                .subVectors(this.targetPosition, this.position)
                .normalize();
            
            this.velocity = direction.multiplyScalar(this.speed * 0.7);
            this.rotation.y = Math.atan2(direction.x, direction.z);
        }
        
        this.position.add(this.velocity.clone().multiplyScalar(deltaTime));
        
        if (this.position.y < GAME_CONSTANTS.MIN_ALTITUDE) {
            this.position.y = GAME_CONSTANTS.MIN_ALTITUDE;
        }
        if (this.position.y > GAME_CONSTANTS.MAX_ALTITUDE) {
            this.position.y = GAME_CONSTANTS.MAX_ALTITUDE;
        }
        
        const mapLimit = GAME_CONSTANTS.MAP_SIZE / 2;
        if (this.position.x > mapLimit) this.position.x = -mapLimit;
        if (this.position.x < -mapLimit) this.position.x = mapLimit;
        if (this.position.z > mapLimit) this.position.z = -mapLimit;
        if (this.position.z < -mapLimit) this.position.z = mapLimit;
        
        // 적 전투기 메시 업데이트 시에도 방향 조정
        this.mesh.position.copy(this.position);
        this.mesh.rotation.x = this.rotation.x;
        this.mesh.rotation.y = this.rotation.y + 3 * Math.PI / 2; // 기본 270도 회전 유지
        this.mesh.rotation.z = this.rotation.z;
        
        this.updateBullets(deltaTime);
    }

    shoot() {
        this.lastShootTime = Date.now();
        
        const bulletGeometry = new THREE.SphereGeometry(0.15);
        const bulletMaterial = new THREE.MeshBasicMaterial({ 
            color: 0xff0000,
            emissive: 0xff0000,
            emissiveIntensity: 0.5
        });
        const bullet = new THREE.Mesh(bulletGeometry, bulletMaterial);
        
        const muzzleOffset = new THREE.Vector3(0, 0, 6);
        muzzleOffset.applyEuler(this.rotation);
        bullet.position.copy(this.position).add(muzzleOffset);
        
        const direction = new THREE.Vector3(0, 0, 1);
        direction.applyEuler(this.rotation);
        bullet.velocity = direction.multiplyScalar(800);
        
        this.scene.add(bullet);
        this.bullets.push(bullet);
    }

    updateBullets(deltaTime) {
        for (let i = this.bullets.length - 1; i >= 0; i--) {
            const bullet = this.bullets[i];
            bullet.position.add(bullet.velocity.clone().multiplyScalar(deltaTime));
            
            if (bullet.position.distanceTo(this.position) > 5000 || 
                bullet.position.y < 0) {
                this.scene.remove(bullet);
                this.bullets.splice(i, 1);
            }
        }
    }

    takeDamage(damage) {
        this.health -= damage;
        return this.health <= 0;
    }

    destroy() {
        if (this.mesh) {
            this.scene.remove(this.mesh);
            this.bullets.forEach(bullet => this.scene.remove(bullet));
            this.bullets = [];
            this.isLoaded = false;
        }
    }
}

// 메인 게임 클래스
class Game {
    constructor() {
        this.scene = new THREE.Scene();
        this.camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 50000);
        this.renderer = new THREE.WebGLRenderer({ antialias: true });
        this.renderer.setSize(window.innerWidth, window.innerHeight);
        this.renderer.shadowMap.enabled = true;
        this.renderer.shadowMap.type = THREE.PCFSoftShadowMap;
        this.renderer.setClearColor(0x87CEEB);
        this.renderer.setPixelRatio(window.devicePixelRatio);
        
        document.getElementById('gameContainer').appendChild(this.renderer.domElement);
        
        this.loader = new GLTFLoader();
        this.fighter = new Fighter();
        this.enemies = [];
        this.isLoaded = false;
        this.isBGMReady = false;
        this.isGameOver = false;
        this.gameTime = GAME_CONSTANTS.MISSION_DURATION;
        this.score = 0;
        this.lastTime = performance.now();
        this.gameTimer = null;
        this.animationFrameId = null;
        
        this.bgm = null;
        this.bgmPlaying = false;
        
        this.keys = { w: false, a: false, s: false, d: false };
        this.isStarted = false;
        
        this.setupScene();
        this.setupEventListeners();
        this.preloadGame();
    }

    async preloadGame() {
        try {
            console.log('게임 리소스 사전 로딩 중...');
            
            await this.fighter.initialize(this.scene, this.loader);
            
            if (!this.fighter.isLoaded) {
                throw new Error('전투기 로딩 실패');
            }
            
            await this.preloadEnemies();
            
            this.isLoaded = true;
            console.log('게임 리소스 로딩 완료');
            
            // BGM 사전 로딩
            await this.preloadBGM();
            
            // 모든 리소스 로딩 완료 후 UI 업데이트
            this.showStartScreen();
            
            this.animate();
            
        } catch (error) {
            console.error('게임 사전 로딩 실패:', error);
            document.getElementById('loading').innerHTML = 
                '<div class="loading-text" style="color: red;">로딩 실패. 페이지를 새로고침해주세요.</div>';
        }
    }

    showStartScreen() {
        if (this.isLoaded && this.isBGMReady) {
            // 로딩 화면 숨기기
            const loadingElement = document.getElementById('loading');
            if (loadingElement) {
                loadingElement.style.display = 'none';
            }
            
            // Start Game 화면 표시
            const startScreen = document.getElementById('startScreen');
            if (startScreen) {
                startScreen.style.display = 'flex';
            }
            
            console.log('모든 리소스 준비 완료 - Start Game 버튼 표시');
        }
    }

    async preloadBGM() {
        console.log('BGM 사전 로딩...');
        
        return new Promise((resolve) => {
            try {
                this.bgm = new Audio('sounds/main.ogg');
                this.bgm.volume = 0.5;
                this.bgm.loop = true;
                
                // BGM 로딩 완료 이벤트
                this.bgm.addEventListener('canplaythrough', () => {
                    console.log('BGM 재생 준비 완료');
                    this.isBGMReady = true;
                    resolve();
                });
                
                this.bgm.addEventListener('error', (e) => {
                    console.log('BGM 에러:', e);
                    this.isBGMReady = true; // 에러가 나더라도 게임은 시작할 수 있게
                    resolve();
                });
                
                // 파일 사전 로딩
                this.bgm.load();
                
                // 타임아웃 설정 (3초 후에도 로딩이 안되면 강제로 완료)
                setTimeout(() => {
                    if (!this.isBGMReady) {
                        console.log('BGM 로딩 타임아웃 - 게임 진행');
                        this.isBGMReady = true;
                        resolve();
                    }
                }, 3000);
                
            } catch (error) {
                console.log('BGM 사전 로딩 실패:', error);
                this.isBGMReady = true; // 에러가 나더라도 게임은 시작할 수 있게
                resolve();
            }
        });
    }

    async preloadEnemies() {
        for (let i = 0; i < GAME_CONSTANTS.ENEMY_COUNT; i++) {
            const angle = (i / GAME_CONSTANTS.ENEMY_COUNT) * Math.PI * 2;
            const distance = 6000 + Math.random() * 3000;
            
            const position = new THREE.Vector3(
                Math.cos(angle) * distance,
                2500 + Math.random() * 2000,
                Math.sin(angle) * distance
            );
            
            const enemy = new EnemyFighter(this.scene, position);
            await enemy.initialize(this.loader);
            this.enemies.push(enemy);
        }
    }

    setupScene() {
        this.scene.background = new THREE.Color(0x87CEEB);
        this.scene.fog = new THREE.Fog(0x87CEEB, 1000, 30000);
        
        const ambientLight = new THREE.AmbientLight(0xffffff, 0.6);
        this.scene.add(ambientLight);
        
        const directionalLight = new THREE.DirectionalLight(0xffffff, 1.0);
        directionalLight.position.set(8000, 10000, 8000);
        directionalLight.castShadow = true;
        directionalLight.shadow.mapSize.width = 2048;
        directionalLight.shadow.mapSize.height = 2048;
        directionalLight.shadow.camera.near = 0.5;
        directionalLight.shadow.camera.far = 20000;
        directionalLight.shadow.camera.left = -10000;
        directionalLight.shadow.camera.right = 10000;
        directionalLight.shadow.camera.top = 10000;
        directionalLight.shadow.camera.bottom = -10000;
        this.scene.add(directionalLight);
        
        const groundGeometry = new THREE.PlaneGeometry(GAME_CONSTANTS.MAP_SIZE, GAME_CONSTANTS.MAP_SIZE);
        const groundMaterial = new THREE.MeshLambertMaterial({ 
            color: 0x8FBC8F,
            transparent: true,
            opacity: 0.8
        });
        const ground = new THREE.Mesh(groundGeometry, groundMaterial);
        ground.rotation.x = -Math.PI / 2;
        ground.receiveShadow = true;
        this.scene.add(ground);
        
        this.addClouds();
    }

    addClouds() {
        const cloudGeometry = new THREE.SphereGeometry(100, 8, 6);
        const cloudMaterial = new THREE.MeshLambertMaterial({ 
            color: 0xffffff, 
            transparent: true, 
            opacity: 0.5 
        });
        
        for (let i = 0; i < 100; i++) {
            const cloud = new THREE.Mesh(cloudGeometry, cloudMaterial);
            cloud.position.set(
                (Math.random() - 0.5) * GAME_CONSTANTS.MAP_SIZE,
                Math.random() * 4000 + 1000,
                (Math.random() - 0.5) * GAME_CONSTANTS.MAP_SIZE
            );
            cloud.scale.set(
                Math.random() * 3 + 1,
                Math.random() * 2 + 0.5,
                Math.random() * 3 + 1
            );
            this.scene.add(cloud);
        }
    }

    setupEventListeners() {
        document.addEventListener('keydown', (event) => {
            if (this.isGameOver) return;
            
            switch(event.code) {
                case 'KeyW': this.keys.w = true; break;
                case 'KeyA': this.keys.a = true; break;
                case 'KeyS': this.keys.s = true; break;
                case 'KeyD': this.keys.d = true; break;
            }
        });

        document.addEventListener('keyup', (event) => {
            if (this.isGameOver) return;
            
            switch(event.code) {
                case 'KeyW': this.keys.w = false; break;
                case 'KeyA': this.keys.a = false; break;
                case 'KeyS': this.keys.s = false; break;
                case 'KeyD': this.keys.d = false; break;
            }
        });

        document.addEventListener('mousemove', (event) => {
            if (!document.pointerLockElement || this.isGameOver) return;
            
            const deltaX = event.movementX || 0;
            const deltaY = event.movementY || 0;
            
            this.fighter.updateMouseInput(deltaX, deltaY);
        });

        document.addEventListener('click', () => {
            if (!document.pointerLockElement) {
                document.body.requestPointerLock();
            } else if (!this.isGameOver && this.fighter.isLoaded && this.isStarted) {
                this.fighter.shoot(this.scene);
            }
        });

        window.addEventListener('resize', () => {
            this.camera.aspect = window.innerWidth / window.innerHeight;
            this.camera.updateProjectionMatrix();
            this.renderer.setSize(window.innerWidth, window.innerHeight);
        });
    }

    startGame() {
        if (!this.isLoaded) {
            console.log('게임이 아직 로딩 중입니다...');
            return;
        }
        
        this.isStarted = true;
        this.startGameTimer();
        
        console.log('게임 시작!');
    }

    startBGM() {
        if (this.bgmPlaying || !this.bgm) return;
        
        console.log('BGM 재생 시도...');
        
        // 즉시 재생 시도
        const playPromise = this.bgm.play();
        
        if (playPromise !== undefined) {
            playPromise.then(() => {
                this.bgmPlaying = true;
                console.log('BGM 재생 시작 성공!');
            }).catch(error => {
                console.log('자동 재생이 차단됨:', error);
                console.log('클릭 후 재생 시도 대기 중...');
                
                // 사용자 상호작용 후 재생 재시도
                const tryPlayOnInteraction = () => {
                    if (!this.bgmPlaying && this.bgm) {
                        console.log('사용자 상호작용으로 BGM 재생 시도...');
                        this.bgm.play().then(() => {
                            this.bgmPlaying = true;
                            console.log('BGM 재생 시작 성공 (클릭 후)!');
                            // 이벤트 리스너 제거
                            document.removeEventListener('click', tryPlayOnInteraction);
                            document.removeEventListener('keydown', tryPlayOnInteraction);
                        }).catch(e => console.log('BGM 재생 실패:', e));
                    }
                };
                
                // 클릭이나 키보드 입력 시 재생 시도
                document.addEventListener('click', tryPlayOnInteraction);
                document.addEventListener('keydown', tryPlayOnInteraction);
            });
        }
    }

    startGameTimer() {
        this.gameTimer = setInterval(() => {
            if (!this.isGameOver) {
                this.gameTime--;
                
                if (this.gameTime <= 0) {
                    this.endGame(true);
                }
            }
        }, 1000);
    }

    updateUI() {
        if (this.fighter.isLoaded) {
            const speedKnots = Math.round(this.fighter.speed * 1.94384);
            const altitudeFeet = Math.round(this.fighter.altitude * 3.28084);
            
            // 안전한 DOM 요소 업데이트
            const scoreElement = document.getElementById('score');
            const timeElement = document.getElementById('time');
            const healthElement = document.getElementById('health');
            const ammoElement = document.getElementById('ammoDisplay');
            const gameStatsElement = document.getElementById('gameStats');
            
            if (scoreElement) scoreElement.textContent = `Score: ${this.score}`;
            if (timeElement) timeElement.textContent = `Time: ${this.gameTime}s`;
            if (healthElement) healthElement.style.width = `${this.fighter.health}%`;
            if (ammoElement) ammoElement.textContent = `AMMO: ${this.fighter.ammo}`;
            
            if (gameStatsElement) {
                gameStatsElement.innerHTML = `
                    <div>Score: ${this.score}</div>
                    <div>Time: ${this.gameTime}s</div>
                    <div>Speed: ${speedKnots} KT</div>
                    <div>Alt: ${altitudeFeet} FT</div>
                    <div>Throttle: ${Math.round(this.fighter.throttle * 100)}%</div>
                    <div>G-Force: ${this.fighter.gForce.toFixed(1)}</div>
                    <div>Targets: ${this.enemies.length}</div>
                `;
            }
        }
    }

    updateRadar() {
        const radar = document.getElementById('radar');
        if (!radar) return;
        
        const oldDots = radar.getElementsByClassName('enemy-dot');
        while (oldDots[0]) {
            oldDots[0].remove();
        }
        
        const radarCenter = { x: 100, y: 100 };
        const radarRange = 10000;
        
        this.enemies.forEach(enemy => {
            if (!enemy.mesh || !enemy.isLoaded) return;
            
            const distance = this.fighter.position.distanceTo(enemy.position);
            if (distance <= radarRange) {
                const relativePos = enemy.position.clone().sub(this.fighter.position);
                const angle = Math.atan2(relativePos.x, relativePos.z);
                const relativeDistance = distance / radarRange;
                
                const dotX = radarCenter.x + Math.sin(angle) * (radarCenter.x * relativeDistance);
                const dotY = radarCenter.y + Math.cos(angle) * (radarCenter.y * relativeDistance);
                
                const dot = document.createElement('div');
                dot.className = 'enemy-dot';
                dot.style.left = `${dotX}px`;
                dot.style.top = `${dotY}px`;
                radar.appendChild(dot);
            }
        });
    }

    checkCollisions() {
        for (let i = this.fighter.bullets.length - 1; i >= 0; i--) {
            const bullet = this.fighter.bullets[i];
            
            for (let j = this.enemies.length - 1; j >= 0; j--) {
                const enemy = this.enemies[j];
                if (!enemy.mesh || !enemy.isLoaded) continue;
                
                const distance = bullet.position.distanceTo(enemy.position);
                if (distance < 25) {
                    this.scene.remove(bullet);
                    this.fighter.bullets.splice(i, 1);
                    
                    if (enemy.takeDamage(30)) {
                        enemy.destroy();
                        this.enemies.splice(j, 1);
                        this.score += 100;
                    }
                    break;
                }
            }
        }
        
        this.enemies.forEach(enemy => {
            enemy.bullets.forEach((bullet, index) => {
                const distance = bullet.position.distanceTo(this.fighter.position);
                if (distance < 30) {
                    this.scene.remove(bullet);
                    enemy.bullets.splice(index, 1);
                    
                    if (this.fighter.takeDamage(20)) {
                        this.endGame(false);
                    }
                }
            });
        });
    }

    animate() {
        if (this.isGameOver) return;
        
        this.animationFrameId = requestAnimationFrame(() => this.animate());
        
        const currentTime = performance.now();
        const deltaTime = Math.min((currentTime - this.lastTime) / 1000, 0.1);
        this.lastTime = currentTime;
        
        if (this.isLoaded && this.fighter.isLoaded) {
            this.fighter.updateControls(this.keys, deltaTime);
            this.fighter.updatePhysics(deltaTime);
            this.fighter.updateBullets(this.scene, deltaTime);
            
            if (this.isStarted) {
                this.enemies.forEach(enemy => {
                    enemy.update(this.fighter.position, deltaTime);
                });
                
                this.checkCollisions();
                
                this.updateUI();
                this.updateRadar();
                
                if (this.enemies.length === 0) {
                    this.endGame(true);
                }
            }
            
            // 카메라 업데이트
            const targetCameraPos = this.fighter.getCameraPosition();
            const targetCameraTarget = this.fighter.getCameraTarget();
            
            this.camera.position.lerp(targetCameraPos, this.fighter.cameraLag);
            this.camera.lookAt(targetCameraTarget);
        } else {
            if (this.fighter.isLoaded) {
                const initialCameraPos = this.fighter.getCameraPosition();
                const initialTarget = this.fighter.getCameraTarget();
                this.camera.position.copy(initialCameraPos);
                this.camera.lookAt(initialTarget);
            }
        }
        
        this.renderer.render(this.scene, this.camera);
    }

    endGame(victory = false) {
        this.isGameOver = true;
        
        if (this.bgm) {
            this.bgm.pause();
            this.bgm = null;
            this.bgmPlaying = false;
        }
        
        if (this.gameTimer) {
            clearInterval(this.gameTimer);
        }
        
        document.exitPointerLock();
        
        const gameOverDiv = document.createElement('div');
        gameOverDiv.className = 'start-screen';
        gameOverDiv.innerHTML = `
            <h1 style="color: ${victory ? '#0f0' : '#f00'}; font-size: 48px;">
                ${victory ? 'MISSION ACCOMPLISHED!' : 'SHOT DOWN!'}
            </h1>
            <div style="color: #0f0; font-size: 24px; margin: 20px 0;">
                Final Score: ${this.score}<br>
                Enemies Destroyed: ${GAME_CONSTANTS.ENEMY_COUNT - this.enemies.length}<br>
                Mission Time: ${GAME_CONSTANTS.MISSION_DURATION - this.gameTime}s
            </div>
            <button class="start-button" onclick="location.reload()">
                New Mission
            </button>
        `;
        
        document.body.appendChild(gameOverDiv);
    }
}

// 게임 인스턴스
let gameInstance = null;

// 전역 함수
window.startGame = function() {
    // 게임과 BGM이 모두 준비되었는지 확인
    if (!gameInstance || !gameInstance.isLoaded || !gameInstance.isBGMReady) {
        console.log('게임이 아직 준비되지 않았습니다...');
        console.log('게임 로딩:', gameInstance?.isLoaded ? '완료' : '진행중');
        console.log('BGM 준비:', gameInstance?.isBGMReady ? '완료' : '진행중');
        return;
    }
    
    document.getElementById('startScreen').style.display = 'none';
    document.body.requestPointerLock();
    
    // 즉시 BGM 재생 시도 (사용자 클릭 시점)
    gameInstance.startBGM();
    gameInstance.startGame();
};

// 게임 초기화
document.addEventListener('DOMContentLoaded', () => {
    console.log('전투기 시뮬레이터 초기화 중...');
    gameInstance = new Game();
});