using UnityEngine;

/// <summary>
/// AI 召唤师控制器：自动召唤单位攻击玩家
/// </summary>
public class AISummoner : MonoBehaviour
{
    [Header("AI 配置")]
    [Tooltip("召唤间隔（秒）")]
    [Min(1f)]
    public float summonInterval = 3f;

    [Tooltip("随机偏移范围（秒），避免太规律")]
    [Min(0f)]
    public float summonRandomOffset = 1f;

    [Tooltip("AI 难度：召唤CD缩放（越小越快）")]
    [Range(0.5f, 2f)]
    public float difficultyScale = 1f;

    [Header("能量管理")]
    [Tooltip("AI 初始能量")]
    [Min(0)]
    public int startingMana = 150;

    [Tooltip("AI 是否使用无限能量")]
    public bool unlimitedMana = false;

    private MainCharacterCombat combat;
    private ManaSystem manaSystem;
    private float summonCooldown;
    private bool isActive;

    private void Start()
    {
        combat = GetComponent<MainCharacterCombat>();
        if (combat == null)
        {
            Debug.LogError($"[AISummoner] {name} 缺少 MainCharacterCombat 组件！");
            enabled = false;
            return;
        }

        manaSystem = FindObjectOfType<ManaSystem>();
        if (manaSystem == null)
        {
            Debug.LogWarning($"[AISummoner] 场景中没有 ManaSystem，AI 将无法检查能量");
        }

        // 初始延迟，避免开局立刻召唤
        summonCooldown = summonInterval * difficultyScale;
        isActive = true;

        Debug.Log($"[AISummoner] {name} AI 初始化完成，召唤间隔: {summonInterval}s");
    }

    private void Update()
    {
        if (!isActive) return;

        // AI 被眩晕时停止召唤
        if (combat.IsStunned) return;

        summonCooldown -= Time.deltaTime;
        if (summonCooldown <= 0f)
        {
            TrySummon();
            ResetCooldown();
        }
    }

    private void TrySummon()
    {
        // 随机选择一个可召唤的角色槽位（1-5）
        var characters = combat.summonableCharacters;
        if (characters == null || characters.Length == 0)
        {
            Debug.LogWarning($"[AISummoner] {name} 没有可召唤的角色");
            return;
        }

        // 过滤出有效的角色数据
        int[] validSlots = new int[characters.Length];
        int validCount = 0;
        
        for (int i = 0; i < characters.Length; i++)
        {
            if (characters[i] != null && characters[i].unitPrefab != null)
            {
                validSlots[validCount++] = i + 1;
            }
        }

        if (validCount == 0)
        {
            // 没有可召唤的角色（能量不足或没有有效角色）
            return;
        }

        // 随机选择一个有效槽位
        int randomIndex = Random.Range(0, validCount);
        int selectedSlot = validSlots[randomIndex];

        // 执行召唤（使用 MainCharacterCombat.RequestSummon）
        bool success = combat.RequestSummon(selectedSlot);
        
        if (success)
        {
            var selectedCharacter = characters[selectedSlot - 1];
            Debug.Log($"[AISummoner] {name} 召唤了 {selectedCharacter.characterName} (槽位: {selectedSlot})");
        }
    }

    private void ResetCooldown()
    {
        float randomOffset = Random.Range(-summonRandomOffset, summonRandomOffset);
        summonCooldown = summonInterval * difficultyScale + randomOffset;
    }

    /// <summary>
    /// 启用/禁用 AI
    /// </summary>
    public void SetActive(bool active)
    {
        isActive = active;
        Debug.Log($"[AISummoner] {name} AI {(active ? "启用" : "禁用")}");
    }

    /// <summary>
    /// 调整难度（实时修改召唤速度）
    /// </summary>
    public void SetDifficulty(float scale)
    {
        difficultyScale = Mathf.Clamp(scale, 0.5f, 2f);
        Debug.Log($"[AISummoner] {name} 难度调整为 {difficultyScale}");
    }
}