import { _decorator, Component, Node, Vec2, Vec3, find, RigidBody2D, Collider2D, Contact2DType, IPhysics2DContact, instantiate, Prefab, UITransform } from 'cc';
import { WeaponBlockExample } from './WeaponBlockExample';
const { ccclass, property } = _decorator;

/**
 * 子弹控制器 - 安全版本
 * 
 * 设计原则：
 * 1. 在子弹添加到场景之前设置所有物理属性
 * 2. 延迟启用物理组件，避免m_world为null错误
 * 3. 确保物理组件在正确的时机激活
 */
@ccclass('BulletController')
export class BulletController extends Component {
    @property
    public speed: number = 300;

    @property
    public damage: number = 1;

    @property
    public lifetime: number = 5;

    private targetEnemy: Node = null;
    private rigidBody: RigidBody2D = null;
    private lifeTimer: number = 0;
    private direction: Vec3 = null;
    private firePosition: Vec3 = null;
    private isInitialized: boolean = false;
    private needsPhysicsSetup: boolean = false;

    /**
     * 设置子弹的发射位置
     * @param position 发射位置（世界坐标）
     */
    public setFirePosition(position: Vec3) {
        this.firePosition = position.clone();
        this.needsPhysicsSetup = true;
        console.log('🎯 子弹发射位置已设置:', this.firePosition);
    }

    start() {
        console.log('🚀 子弹start()开始...');
        
        // 设置生命周期
        this.lifeTimer = this.lifetime;
        
        // 如果需要设置物理属性，延迟处理
        if (this.needsPhysicsSetup) {
            // 使用更短的延迟，确保物理世界准备好
            this.scheduleOnce(() => {
                this.setupPhysics();
            }, 0.05);
        }
        
        console.log('✅ 子弹start()完成');
    }
    
    /**
     * 设置物理属性
     */
    private setupPhysics() {
        console.log('🔧 开始设置子弹物理属性...');
        
        // 获取物理组件
        this.rigidBody = this.node.getComponent(RigidBody2D);
        const collider = this.node.getComponent(Collider2D);
        
        if (!this.rigidBody) {
            console.error('❌ 子弹预制体缺少RigidBody2D组件');
            return;
        }
        
        if (!collider) {
            console.error('❌ 子弹预制体缺少Collider2D组件');
            return;
        }
        
        console.log('✅ 物理组件获取成功');
        
        // 确保物理组件设置正确
        this.rigidBody.enabledContactListener = true;
        this.rigidBody.gravityScale = 0; // 不受重力影响
        this.rigidBody.linearDamping = 0; // 无阻尼
        this.rigidBody.angularDamping = 0; // 无角阻尼
        
        // 绑定碰撞事件
        collider.on(Contact2DType.BEGIN_CONTACT, this.onBeginContact, this);
        console.log('✅ 碰撞事件已绑定');
        
        // 设置子弹位置
        if (this.firePosition) {
            this.setPositionInGameArea();
        }
        
        // 初始化方向和速度
        this.initializeDirection();
        this.isInitialized = true;
        
        console.log('✅ 子弹物理属性设置完成');
    }
    
    /**
     * 在GameArea中设置子弹位置
     */
    private setPositionInGameArea() {
        const gameArea = find('Canvas/GameLevelUI/GameArea');
        if (gameArea) {
            const gameAreaTransform = gameArea.getComponent(UITransform);
            if (gameAreaTransform) {
                const localPos = gameAreaTransform.convertToNodeSpaceAR(this.firePosition);
                this.node.position = localPos;
                console.log('✅ 子弹位置已设置:', localPos);
            }
        }
    }
    
    /**
     * 初始化子弹方向
     */
    private initializeDirection() {
        console.log('🎯 开始初始化子弹方向...');
        
        // 寻找最近的敌人
        this.findNearestEnemy();
        
        // 设置方向
        if (this.targetEnemy) {
            this.setDirectionToTarget();
        } else {
            // 随机方向
            const randomAngle = Math.random() * Math.PI * 2;
            this.direction = new Vec3(Math.cos(randomAngle), Math.sin(randomAngle), 0);
            console.log('🎲 使用随机方向');
        }
        
        // 应用速度
        this.applyVelocity();
    }

    // 寻找最近的敌人
    private findNearestEnemy() {
        const enemyContainer = find('Canvas/GameLevelUI/enemyContainer');
        if (!enemyContainer) {
            console.log('❌ 未找到敌人容器');
            return;
        }
        
        const enemies = enemyContainer.children.filter(child => 
            child.active && 
            (child.name.toLowerCase().includes('enemy') || 
             child.getComponent('EnemyInstance') !== null)
        );
        
        if (enemies.length === 0) {
            console.log('❌ 没有找到敌人');
            return;
        }
        
        let nearestEnemy: Node = null;
        let nearestDistance = Infinity;
        const bulletPos = this.node.worldPosition;
        
        for (const enemy of enemies) {
            const distance = Vec3.distance(bulletPos, enemy.worldPosition);
            if (distance < nearestDistance) {
                nearestDistance = distance;
                nearestEnemy = enemy;
            }
        }
        
        if (nearestEnemy) {
            this.targetEnemy = nearestEnemy;
            console.log(`🎯 锁定目标: ${nearestEnemy.name}`);
        }
    }

    // 设置朝向目标的方向
    private setDirectionToTarget() {
        if (!this.targetEnemy) return;
        
        const targetPos = this.targetEnemy.worldPosition;
        const currentPos = this.node.worldPosition;
        
        this.direction = targetPos.clone().subtract(currentPos).normalize();
        console.log('🎯 方向已设置，朝向目标敌人');
    }

    // 应用速度
    private applyVelocity() {
        if (!this.rigidBody || !this.direction) {
            console.error('❌ 无法应用速度：缺少刚体或方向');
            return;
        }
        
        // 覆盖速度值（全局控制）
        const weaponGlobal = WeaponBlockExample.getInstance && WeaponBlockExample.getInstance();
        if (weaponGlobal) {
            this.speed = weaponGlobal.getCurrentBulletSpeed();
        }
        
        const velocity = new Vec2(
            this.direction.x * this.speed,
            this.direction.y * this.speed
        );
        
        this.rigidBody.linearVelocity = velocity;
        console.log('✅ 子弹速度已应用:', velocity);
    }

    // 碰撞检测
    onBeginContact(selfCollider: Collider2D, otherCollider: Collider2D, contact: IPhysics2DContact | null) {
        const otherNode = otherCollider.node;
        console.log('💥 子弹碰撞:', otherNode.name);
        
        // 检查是否击中敌人
        if (this.isEnemyNode(otherNode)) {
            console.log('🎯 击中敌人:', otherNode.name);
            this.damageEnemy(otherNode);
            this.node.destroy();
        } else if (otherNode.name.toLowerCase().includes('wall')) {
            console.log('🧱 击中墙体，销毁子弹');
            this.node.destroy();
        }
    }
    
    // 判断是否为敌人节点
    private isEnemyNode(node: Node): boolean {
        const name = node.name.toLowerCase();
        return name.includes('enemy') || 
               name.includes('敌人') ||
               node.getComponent('EnemyInstance') !== null ||
               node.getComponent('EnemyComponent') !== null;
    }
    
    // 对敌人造成伤害
    private damageEnemy(enemyNode: Node) {
        console.log('⚔️ 对敌人造成伤害:', this.damage);
        
        // 尝试调用敌人的受伤方法
        const enemyInstance = enemyNode.getComponent('EnemyInstance') as any;
        if (enemyInstance) {
            if (typeof enemyInstance.takeDamage === 'function') {
                enemyInstance.takeDamage(this.damage);
                return;
            }
            if (typeof enemyInstance.health === 'number') {
                enemyInstance.health -= this.damage;
                if (enemyInstance.health <= 0) {
                    enemyNode.destroy();
                }
                return;
            }
        }
        
        // 备用方案：通过EnemyController
        const enemyController = find('Canvas/GameLevelUI/EnemyController')?.getComponent('EnemyController') as any;
        if (enemyController && typeof enemyController.damageEnemy === 'function') {
            enemyController.damageEnemy(enemyNode, this.damage);
        }
    }

    update(dt: number) {
        // 只有在初始化完成后才进行更新
        if (!this.isInitialized) return;
        
        // 生命周期倒计时
        this.lifeTimer -= dt;
        if (this.lifeTimer <= 0) {
            this.node.destroy();
        }

        // 检查是否飞出游戏区域
        this.checkOutOfBounds();
    }

    /**
     * 如果子弹飞出 GameArea 边界（留有一定安全距离）则自动销毁
     */
    private checkOutOfBounds() {
        // 使用整个屏幕（Canvas）范围判定，而不是 GameArea
        const canvas = find('Canvas');
        if (!canvas || !this.node || !this.node.isValid) return;

        const uiTransform = canvas.getComponent(UITransform);
        if (!uiTransform) return;

        const halfWidth = uiTransform.width / 2;
        const halfHeight = uiTransform.height / 2;
        const center = canvas.worldPosition;

        const left = center.x - halfWidth;
        const right = center.x + halfWidth;
        const bottom = center.y - halfHeight;
        const top = center.y + halfHeight;

        // 允许子弹稍微超出边界后再销毁，避免边缘误差
        const margin = 100;

        const pos = this.node.worldPosition;
        if (pos.x < left - margin || pos.x > right + margin || pos.y < bottom - margin || pos.y > top + margin) {
            this.node.destroy();
        }
    }
}