using UnityEngine;
using System.Collections.Generic;

/// <summary>
/// 增益系统管理器（单例）
/// 管理全局增益效果的应用
/// </summary>
public class BuffSystem : MonoBehaviour
{
    private static BuffSystem instance;
    public static BuffSystem Instance
    {
        get
        {
            if (instance == null)
            {
                var go = new GameObject("BuffSystem");
                instance = go.AddComponent<BuffSystem>();
                DontDestroyOnLoad(go);
            }
            return instance;
        }
    }

    private void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }
        instance = this;
    }

    /// <summary>
    /// 应用群体治疗增益
    /// </summary>
    public void ApplyGroupHeal(float healAmount)
    {
        var allies = FindObjectsOfType<UnitBase>();
        int healedCount = 0;

        foreach (var unit in allies)
        {
            var team = unit.GetComponent<UnitTeam>();
            if (team != null && team.teamId == 0) // 友方
            {
                var healthBar = unit.GetComponent<WorldHealthBar>();
                if (healthBar != null)
                {
                    healthBar.Heal(healAmount);
                    healedCount++;
                }
            }
        }

        Debug.Log($"群体治疗：治疗了 {healedCount} 个友方单位，每个恢复 {healAmount} 生命");
    }

    /// <summary>
    /// 应用全局攻速增益
    /// </summary>
    public void ApplyGlobalAttackSpeedBuff(float speedMultiplier)
    {
        var allies = FindObjectsOfType<UnitBase>();
        int buffedCount = 0;

        foreach (var unit in allies)
        {
            var team = unit.GetComponent<UnitTeam>();
            if (team != null && team.teamId == 0) // 友方
            {
                // 使用 UnitBase 的攻速倍增系统
                unit.MultiplyAttackSpeed(speedMultiplier, 3f); // 最高3倍攻速
                buffedCount++;
            }
        }

        Debug.Log($"全局攻速增益：{buffedCount} 个友方单位攻速提升 {(speedMultiplier - 1) * 100}%");
    }

    /// <summary>
    /// 应用全局攻击力增益
    /// </summary>
    public void ApplyGlobalAttackBuff(float attackMultiplier)
    {
        var allies = FindObjectsOfType<UnitBase>();
        int buffedCount = 0;

        foreach (var unit in allies)
        {
            var team = unit.GetComponent<UnitTeam>();
            if (team != null && team.teamId == 0) // 友方
            {
                unit.attackPower *= attackMultiplier;
                buffedCount++;
            }
        }

        Debug.Log($"全局攻击增益：{buffedCount} 个友方单位攻击力提升 {(attackMultiplier - 1) * 100}%");
    }

    /// <summary>
    /// 应用全局生命增益
    /// </summary>
    public void ApplyGlobalHealthBuff(float healthMultiplier)
    {
        var allies = FindObjectsOfType<UnitBase>();
        int buffedCount = 0;

        foreach (var unit in allies)
        {
            var team = unit.GetComponent<UnitTeam>();
            if (team != null && team.teamId == 0) // 友方
            {
                var healthBar = unit.GetComponent<WorldHealthBar>();
                if (healthBar != null)
                {
                    healthBar.maxHealth *= healthMultiplier;
                    healthBar.currentHealth *= healthMultiplier;
                    buffedCount++;
                }
            }
        }

        Debug.Log($"全局生命增益：{buffedCount} 个友方单位生命值提升 {(healthMultiplier - 1) * 100}%");
    }
}