using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Button))]
public class SummonCardButton : MonoBehaviour
{
    [Header("角色数据")]
    public CharacterData characterData;

    [Header("卡槽配置")]
    [Min(1)]
    public int summonSlot = 1;

    [Header("UI 引用")]
    public Image cooldownMask;
    public Text cooldownText;
    public Image cardIcon;
    public Text characterNameText;
    public Text manaCostText;
    public Image costNumberImage; // 费用数字图片

    [Header("费用数字精灵")]
    public Sprite[] costNumberSprites; // 数字_0 到 数字_8，对应费用 1-9

    private Button button;
    private MainCharacterCombat combat;
    private float cooldownTimer;
    private bool isOnCooldown;

    private void Awake()
    {
        button = GetComponent<Button>();
        combat = FindObjectOfType<MainCharacterCombat>();
        button.onClick.AddListener(OnClick);
        
        isOnCooldown = false;
        cooldownTimer = 0f;
        
        UpdateCardUI();
        UpdateCooldownUI();
    }

    private void OnDestroy()
    {
        if (button != null)
        {
            button.onClick.RemoveListener(OnClick);
        }
    }

    private void Update()
    {
        if (isOnCooldown)
        {
            cooldownTimer -= Time.deltaTime;
            if (cooldownTimer <= 0f)
            {
                isOnCooldown = false;
                cooldownTimer = 0f;
            }

            UpdateCooldownUI();
        }

        UpdateButtonState();
    }

    public void OnClick()
    {
        if (characterData == null)
        {
            return;
        }

        // 决战模式：有布阵管理器时走选兵逻辑，不消耗金币。
        if (BattleSetupManager.Instance != null)
        {
            BattleSetupManager.Instance.SelectCharacter(characterData);
            return;
        }

        // 建筑模式：检查建筑费用是否足够
        if (GoldSystem.Instance == null || GoldSystem.Instance.CurrentGold < characterData.buildingCost)
        {
            Debug.Log($"金币不足，需要{characterData.buildingCost}");
            return;
        }

        // 触发建筑放置模式
        if (BuildingPlacementManager.Instance != null)
        {
            BuildingPlacementManager.Instance.StartPlacingBuilding(characterData);
        }
        else
        {
            Debug.LogError("找不到 BuildingPlacementManager");
        }
    }

    private void StartCooldown()
    {
        if (characterData != null)
        {
            isOnCooldown = true;
            cooldownTimer = characterData.cooldownTime;
            UpdateCooldownUI();
        }
    }

    private void UpdateCooldownUI()
    {
        bool canAfford = CanAfford();
        
        if (cooldownMask != null)
        {
            // CD中显示CD进度，能量不足时显示满遮罩
            if (isOnCooldown)
            {
                cooldownMask.fillAmount = cooldownTimer / GetCooldownTime();
                cooldownMask.enabled = true;
            }
            else if (!canAfford)
            {
                // 能量不足：显示满遮罩
                cooldownMask.fillAmount = 1f;
                cooldownMask.enabled = true;
            }
            else
            {
                // 可用状态：隐藏遮罩
                cooldownMask.fillAmount = 0f;
                cooldownMask.enabled = false;
            }
        }

        if (cooldownText != null)
        {
            cooldownText.text = isOnCooldown ? Mathf.CeilToInt(cooldownTimer).ToString() : "";
            cooldownText.enabled = isOnCooldown;
        }
    }

    private void UpdateButtonState()
    {
        if (button == null)
        {
            return;
        }

        button.interactable = !isOnCooldown && CanAfford();
    }

    private bool CanAfford()
    {
        if (characterData == null)
        {
            return false;
        }

        // 决战模式按人口判断。
        if (BattleSetupManager.Instance != null)
        {
            return BattleSetupManager.Instance.CanAfford(characterData);
        }

        // 建筑模式按金币判断。
        if (GoldSystem.Instance == null)
        {
            return false;
        }

        return GoldSystem.Instance.CurrentGold >= characterData.buildingCost;
    }

    private float GetCooldownTime()
    {
        return characterData != null ? characterData.cooldownTime : 5f;
    }

    private void UpdateCardUI()
    {
        if (characterData == null)
        {
            return;
        }

        if (cardIcon != null && characterData.cardIcon != null)
        {
            cardIcon.sprite = characterData.cardIcon;
        }

        if (characterNameText != null)
        {
            characterNameText.text = characterData.characterName;
        }

        if (manaCostText != null)
        {
            manaCostText.text = characterData.manaCost.ToString();
        }

        // 更新费用数字精灵
        UpdateCostNumberSprite();
    }

    private void UpdateCostNumberSprite()
    {
        if (costNumberImage == null || characterData == null)
        {
            return;
        }

        int cost = characterData.manaCost;
        
        // 费用范围 1-9，对应精灵索引 0-8
        if (cost >= 1 && cost <= 9 && costNumberSprites != null && costNumberSprites.Length >= cost)
        {
            costNumberImage.sprite = costNumberSprites[cost - 1];
            costNumberImage.enabled = true;
        }
        else
        {
            // 超出范围或未配置精灵数组，隐藏图片
            costNumberImage.enabled = false;
        }
    }
}