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

// 게임 상수
const GAME_DURATION = 180;
const MAP_SIZE = 2000;
const TANK_HEIGHT = 0.5;  // 포탑 높이 조정
const ENEMY_GROUND_HEIGHT = 0;
const ENEMY_SCALE = 10;
const MAX_HEALTH = 1000;
const ENEMY_MOVE_SPEED = 0.1;
const ENEMY_COUNT_MAX = 5;
const PARTICLE_COUNT = 15;
const OBSTACLE_COUNT = 50;
const ENEMY_CONFIG = {
    ATTACK_RANGE: 100,
    ATTACK_INTERVAL: 2000,
    BULLET_SPEED: 2
};


// TankPlayer 클래스 수정
class TankPlayer {
    constructor() {
        this.body = null;
        this.turret = null;
        this.position = new THREE.Vector3(0, 0, 0);
        this.rotation = new THREE.Euler(0, 0, 0);
        this.turretRotation = 0;
        this.moveSpeed = 0.5;
        this.turnSpeed = 0.03;
        this.turretGroup = new THREE.Group();
        this.health = MAX_HEALTH;
    }

    async initialize(scene, loader) {
        try {
            const bodyResult = await loader.loadAsync('/models/abramsBody.glb');
            this.body = bodyResult.scene;
            this.body.position.copy(this.position);
            
            const turretResult = await loader.loadAsync('/models/abramsTurret.glb');
            this.turret = turretResult.scene;
            
            // 포탑 위치 조정
            this.turretGroup.position.y = 0.2; // 포탑 높이 조정
            this.turretGroup.add(this.turret);
            this.body.add(this.turretGroup);
            
            this.body.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                }
            });
            
            this.turret.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                }
            });

            scene.add(this.body);
            
        } catch (error) {
            console.error('Error loading tank models:', error);
        }
    }

    update(mouseX, mouseY) {
        if (!this.body || !this.turretGroup) return;
        
        const targetAngle = Math.atan2(mouseX, mouseY);
        const currentRotation = this.turretGroup.rotation.y;
        const rotationDiff = targetAngle - currentRotation;
        
        // 포탑 회전 각도 정규화
        let normalizedDiff = rotationDiff;
        while (normalizedDiff > Math.PI) normalizedDiff -= Math.PI * 2;
        while (normalizedDiff < -Math.PI) normalizedDiff += Math.PI * 2;
        
        this.turretGroup.rotation.y += normalizedDiff * 0.1;
    }

    move(direction) {
        if (!this.body) return;
        
        const moveVector = new THREE.Vector3();
        moveVector.x = direction.x * this.moveSpeed;
        moveVector.z = direction.z * this.moveSpeed;
        
        moveVector.applyEuler(this.body.rotation);
        this.body.position.add(moveVector);
    }

    rotate(angle) {
        if (!this.body) return;
        this.body.rotation.y += angle * this.turnSpeed;
    }

    getPosition() {
        return this.body ? this.body.position : new THREE.Vector3();
    }

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

// Enemy 클래스 정의
class Enemy {
    constructor(scene, position) {
        this.scene = scene;
        this.position = position;
        this.mesh = null;
        this.health = 100;
        this.lastAttackTime = 0;
        this.bullets = [];
    }

    async initialize(loader) {
        try {
            const result = await loader.loadAsync('/models/enemy1.glb');
            this.mesh = result.scene;
            this.mesh.position.copy(this.position);
            this.mesh.scale.set(ENEMY_SCALE, ENEMY_SCALE, ENEMY_SCALE);
            
            this.mesh.traverse((child) => {
                if (child.isMesh) {
                    child.castShadow = true;
                    child.receiveShadow = true;
                }
            });
            
            this.scene.add(this.mesh);
        } catch (error) {
            console.error('Error loading enemy model:', error);
        }
    }

    update(playerPosition) {
        if (!this.mesh) return;

        // 플레이어 방향으로 회전
        const direction = new THREE.Vector3()
            .subVectors(playerPosition, this.mesh.position)
            .normalize();
        
        this.mesh.lookAt(playerPosition);

        // 플레이어 방향으로 이동
        this.mesh.position.add(direction.multiplyScalar(ENEMY_MOVE_SPEED));

        // 총알 업데이트
        for (let i = this.bullets.length - 1; i >= 0; i--) {
            const bullet = this.bullets[i];
            bullet.position.add(bullet.velocity);

            // 총알이 맵 밖으로 나가면 제거
            if (Math.abs(bullet.position.x) > MAP_SIZE || 
                Math.abs(bullet.position.z) > MAP_SIZE) {
                this.scene.remove(bullet);
                this.bullets.splice(i, 1);
            }
        }
    }

    shoot(playerPosition) {
        const currentTime = Date.now();
        if (currentTime - this.lastAttackTime < ENEMY_CONFIG.ATTACK_INTERVAL) return;

        const bulletGeometry = new THREE.SphereGeometry(0.2);
        const bulletMaterial = new THREE.MeshBasicMaterial({ color: 0xff0000 });
        const bullet = new THREE.Mesh(bulletGeometry, bulletMaterial);

        bullet.position.copy(this.mesh.position);
        
        const direction = new THREE.Vector3()
            .subVectors(playerPosition, this.mesh.position)
            .normalize();
        
        bullet.velocity = direction.multiplyScalar(ENEMY_CONFIG.BULLET_SPEED);
        
        this.scene.add(bullet);
        this.bullets.push(bullet);
        this.lastAttackTime = currentTime;
    }

    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 = [];
        }
    }
}

// Particle 클래스 정의
class Particle {
    constructor(scene, position) {
        const geometry = new THREE.SphereGeometry(0.1);
        const material = new THREE.MeshBasicMaterial({ color: 0xff0000 });
        this.mesh = new THREE.Mesh(geometry, material);
        this.mesh.position.copy(position);
        
        this.velocity = new THREE.Vector3(
            (Math.random() - 0.5) * 0.3,
            Math.random() * 0.2,
            (Math.random() - 0.5) * 0.3
        );
        
        this.gravity = -0.01;
        this.lifetime = 60;
        this.age = 0;
        
        scene.add(this.mesh);
    }

    update() {
        this.velocity.y += this.gravity;
        this.mesh.position.add(this.velocity);
        this.age++;
        return this.age < this.lifetime;
    }

    destroy(scene) {
        scene.remove(this.mesh);
    }
}
// Game 클래스 정의
class Game {
    constructor() {
        // 기본 Three.js 설정
        this.scene = new THREE.Scene();
        this.camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
        this.renderer = new THREE.WebGLRenderer({ antialias: true });
        this.renderer.setSize(window.innerWidth, window.innerHeight);
        this.renderer.shadowMap.enabled = true;
        document.body.appendChild(this.renderer.domElement);

        // 게임 요소 초기화
        this.tank = new TankPlayer();
        this.enemies = [];
        this.particles = [];
        this.obstacles = [];
        this.loader = new GLTFLoader();
        this.controls = null;
        this.gameTime = GAME_DURATION;
        this.score = 0;
        this.isGameOver = false;

        // 마우스 상태
        this.mouse = {
            x: 0,
            y: 0
        };

        // 키보드 상태
        this.keys = {
            forward: false,
            backward: false,
            left: false,
            right: false
        };

        // 이벤트 리스너 설정
        this.setupEventListeners();
        
        // 게임 초기화
        this.initialize();
    }

    async initialize() {
        // 조명 설정
        const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
        this.scene.add(ambientLight);

        const directionalLight = new THREE.DirectionalLight(0xffffff, 0.8);
        directionalLight.position.set(50, 50, 50);
        directionalLight.castShadow = true;
        this.scene.add(directionalLight);

        // 바닥 생성
        const groundGeometry = new THREE.PlaneGeometry(MAP_SIZE, MAP_SIZE);
        const groundMaterial = new THREE.MeshStandardMaterial({ 
            color: 0x808080,
            roughness: 0.8,
            metalness: 0.2
        });
        const ground = new THREE.Mesh(groundGeometry, groundMaterial);
        ground.rotation.x = -Math.PI / 2;
        ground.receiveShadow = true;
        this.scene.add(ground);

        // 탱크 초기화
        await this.tank.initialize(this.scene, this.loader);

        // 장애물 생성
        this.createObstacles();

        // 카메라 위치 설정
        this.camera.position.set(0, 10, -10);
        this.camera.lookAt(0, 0, 0);

        // 포인터 락 컨트롤 설정
        this.controls = new PointerLockControls(this.camera, document.body);

        // 게임 시작
        this.animate();
        this.spawnEnemies();
        this.startGameTimer();
    }

    createObstacles() {
        for (let i = 0; i < OBSTACLE_COUNT; i++) {
            const geometry = new THREE.BoxGeometry(2, 2, 2);
            const material = new THREE.MeshStandardMaterial({ color: 0x808080 });
            const obstacle = new THREE.Mesh(geometry, material);
            
            obstacle.position.x = (Math.random() - 0.5) * MAP_SIZE;
            obstacle.position.z = (Math.random() - 0.5) * MAP_SIZE;
            obstacle.position.y = 1;
            
            obstacle.castShadow = true;
            obstacle.receiveShadow = true;
            
            this.obstacles.push(obstacle);
            this.scene.add(obstacle);
        }
    }

    spawnEnemies() {
        const spawnEnemy = () => {
            if (this.enemies.length < ENEMY_COUNT_MAX && !this.isGameOver) {
                const position = new THREE.Vector3(
                    (Math.random() - 0.5) * MAP_SIZE,
                    ENEMY_GROUND_HEIGHT,
                    (Math.random() - 0.5) * MAP_SIZE
                );
                
                const enemy = new Enemy(this.scene, position);
                enemy.initialize(this.loader);
                this.enemies.push(enemy);
            }
            setTimeout(spawnEnemy, 3000);
        };
        
        spawnEnemy();
    }

    startGameTimer() {
        const timer = setInterval(() => {
            this.gameTime--;
            if (this.gameTime <= 0 || this.isGameOver) {
                clearInterval(timer);
                this.endGame();
            }
        }, 1000);
    }

    setupEventListeners() {
        // 키보드 이벤트
        document.addEventListener('keydown', (event) => {
            switch(event.code) {
                case 'KeyW': this.keys.forward = true; break;
                case 'KeyS': this.keys.backward = true; break;
                case 'KeyA': this.keys.left = true; break;
                case 'KeyD': this.keys.right = true; break;
            }
        });

        document.addEventListener('keyup', (event) => {
            switch(event.code) {
                case 'KeyW': this.keys.forward = false; break;
                case 'KeyS': this.keys.backward = false; break;
                case 'KeyA': this.keys.left = false; break;
                case 'KeyD': this.keys.right = false; break;
            }
        });

        // 마우스 이벤트
        document.addEventListener('mousemove', (event) => {
            this.mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
            this.mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
        });

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

    handleMovement() {
        const direction = new THREE.Vector3();
        
        if (this.keys.forward) direction.z += 1;
        if (this.keys.backward) direction.z -= 1;
        if (this.keys.left) this.tank.rotate(-1);
        if (this.keys.right) this.tank.rotate(1);
        
        if (direction.length() > 0) {
            direction.normalize();
            this.tank.move(direction);
        }
    }

    updateParticles() {
        for (let i = this.particles.length - 1; i >= 0; i--) {
            const particle = this.particles[i];
            if (!particle.update()) {
                particle.destroy(this.scene);
                this.particles.splice(i, 1);
            }
        }
    }

    createExplosion(position) {
        for (let i = 0; i < PARTICLE_COUNT; i++) {
            this.particles.push(new Particle(this.scene, position));
        }
    }

    checkCollisions() {
        const tankPosition = this.tank.getPosition();

        // 적과의 충돌 체크
        this.enemies.forEach(enemy => {
            if (!enemy.mesh) return;

            enemy.bullets.forEach(bullet => {
                const distance = bullet.position.distanceTo(tankPosition);
                if (distance < 1) {
                    if (this.tank.takeDamage(10)) {
                        this.endGame();
                    }
                    this.scene.remove(bullet);
                    enemy.bullets = enemy.bullets.filter(b => b !== bullet);
                }
            });
        });
    }

    endGame() {
        this.isGameOver = true;
        // 게임 오버 UI 표시
        const gameOverDiv = document.createElement('div');
        gameOverDiv.style.position = 'absolute';
        gameOverDiv.style.top = '50%';
        gameOverDiv.style.left = '50%';
        gameOverDiv.style.transform = 'translate(-50%, -50%)';
        gameOverDiv.style.color = 'white';
        gameOverDiv.style.fontSize = '48px';
        gameOverDiv.innerHTML = `Game Over<br>Score: ${this.score}`;
        document.body.appendChild(gameOverDiv);
    }

    animate() {
        if (this.isGameOver) return;

        requestAnimationFrame(() => this.animate());

        // 탱크 업데이트
        this.tank.update(this.mouse.x, this.mouse.y);
        this.handleMovement();

        // 적 업데이트
        const tankPosition = this.tank.getPosition();
        this.enemies.forEach(enemy => {
            enemy.update(tankPosition);
            const distance = enemy.mesh?.position.distanceTo(tankPosition) || Infinity;
            if (distance < ENEMY_CONFIG.ATTACK_RANGE) {
                enemy.shoot(tankPosition);
            }
        });

        // 파티클 업데이트
        this.updateParticles();

        // 충돌 체크
        this.checkCollisions();

        // 렌더링
        this.renderer.render(this.scene, this.camera);
    }
}

// 게임 시작
const game = new Game();