using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BaseGames.Core.Events;

namespace BaseGames.UI
{
    /// <summary>
    /// 工具栏 HUD（架构 09_ProgressionModule §7.5）。
    /// 显示 2 个工具槽的图标 + 剩余次数 + 冷却遮罩。
    /// </summary>
    public class ToolHUD : MonoBehaviour
    {
        [SerializeField] private ToolSlotUI[]         _slots;         // 2 个 ToolSlotUI 组件
        [SerializeField] private BaseGames.Equipment.ToolSlotManager  _slotManager;
        [SerializeField] private ToolUsedEventChannelSO               _onToolUsed;

        private readonly CompositeDisposable _subs = new();

        private void OnEnable()
        {
            _onToolUsed?.Subscribe(RefreshSlot).AddTo(_subs);
        }

        private void OnDisable()
        {
            _subs.Clear();
        }

        private void RefreshSlot(ToolUsedPayload payload)
        {
            int i = payload.SlotIndex;
            if (_slots == null || i < 0 || i >= _slots.Length) return;
            _slots[i].Refresh(
                _slotManager.GetTool(i),
                _slotManager.GetRemainingUses(i),
                _slotManager.GetCooldownRatio(i));
        }

        private void Update()
        {
            if (_slots == null || _slotManager == null) return;
            for (int i = 0; i < _slots.Length; i++)
                _slots[i].SetCooldownFill(_slotManager.GetCooldownRatio(i));
        }
    }

    /// <summary>
    /// 单个工具槽 UI：图标 + 剩余次数文本 + 冷却遮罩 Image（FillAmount）。
    /// </summary>
    public class ToolSlotUI : MonoBehaviour
    {
        [SerializeField] private Image    _icon;
        [SerializeField] private TMP_Text _usesText;
        [SerializeField] private Image    _cooldownMask;   // type = Filled, Image Type = Filled

        public void Refresh(BaseGames.Equipment.ToolSO tool, int remainingUses, float cooldownRatio)
        {
            if (_icon != null)
                _icon.sprite = tool != null ? tool.icon : null;

            if (_usesText != null)
                _usesText.text = remainingUses < 0 ? "∞" : remainingUses.ToString();

            SetCooldownFill(cooldownRatio);
        }

        public void SetCooldownFill(float ratio)
        {
            if (_cooldownMask != null)
                _cooldownMask.fillAmount = Mathf.Clamp01(ratio);
        }
    }
}