using System;
using TMPro;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UI;
using BaseGames.Input;
using BaseGames.Localization;

namespace BaseGames.UI.Settings
{
    /// <summary>
    /// 单行按键重绑定 UI（架构 04_InputModule §6）。
    /// 显示 Action 名称 + 当前绑定路径；点击按钮触发交互式重绑定。
    /// 由 RebindPanel.Initialize() 批量配置；不直接加载任何资产。
    /// </summary>
    public class RebindActionRow : MonoBehaviour
    {
        [Tooltip("对应 Input Action 的名称（与 InputActions 资产中 Gameplay Map 内的名称一致）")]
        [SerializeField] private string   _actionName;
        [Tooltip("绑定索引：0 = 主绑定，1 = 副绑定（视 Action 定义而定）")]
        [SerializeField] private int      _bindingIndex;

        [Header("UI 引用")]
        [SerializeField] private TMP_Text _actionLabel;         // 显示 Action 可读名（固定）
        [SerializeField] private TMP_Text _currentBindingText;  // 显示当前绑定路径
        [SerializeField] private Button   _bindButton;          // 点击启动重绑定

        private InputReaderSO    _inputReader;
        private ConflictDetector _conflictDetector;
        private Action<RebindActionRow> _onRebindRequested;

        // ── 初始化（由 RebindPanel 调用）──────────────────────────────────

        public void Initialize(
            InputReaderSO reader,
            ConflictDetector detector,
            Action<RebindActionRow> onRequest)
        {
            _inputReader       = reader;
            _conflictDetector  = detector;
            _onRebindRequested = onRequest;

            if (_actionLabel != null)
                _actionLabel.text = _actionName;

            _bindButton.onClick.AddListener(() => _onRebindRequested?.Invoke(this));
            RefreshDisplay();
        }

        // ── 重绑定流程 ────────────────────────────────────────────────────

        /// <summary>启动交互式重绑定；完成或取消后调用 onFinished。</summary>
        public void StartRebind(Action onFinished)
        {
            _currentBindingText.text = LocalizationManager.Get("REBIND_WAITING_PROMPT", LocalizationTable.UI);
            _inputReader.StartRebinding(
                _actionName,
                _bindingIndex,
                onComplete: () =>
                {
                    RefreshDisplay();
                    RefreshConflicts();
                    onFinished?.Invoke();
                },
                onCancel: () =>
                {
                    RefreshDisplay();
                    onFinished?.Invoke();
                });
        }

        // ── 显示刷新 ──────────────────────────────────────────────────────

        /// <summary>从 InputReaderSO 读取当前绑定路径并更新文字。</summary>
        public void RefreshDisplay()
        {
            if (_inputReader == null) return;
            var action = _inputReader.FindAction(_actionName);
            if (action == null || _bindingIndex >= action.bindings.Count)
            {
                _currentBindingText.text = "—";
                return;
            }
            var path = action.bindings[_bindingIndex].effectivePath;
            _currentBindingText.text = string.IsNullOrEmpty(path)
                ? "—"
                : InputControlPath.ToHumanReadableString(
                    path,
                    InputControlPath.HumanReadableStringOptions.OmitDevice);
        }

        /// <summary>冲突状态着色：红色 = 与其他 Action 路径冲突，白色 = 正常。</summary>
        public void SetConflictHighlight(bool conflict)
            => _currentBindingText.color = conflict ? Color.red : Color.white;

        /// <summary>是否允许用户点击此行的绑定按钮。</summary>
        public void SetInteractable(bool interactable)
            => _bindButton.interactable = interactable;

        // ── 内部 ──────────────────────────────────────────────────────────

        /// <summary>重绑定完成后扫描 Panel 内所有行，更新冲突高亮。</summary>
        private void RefreshConflicts()
        {
            if (_conflictDetector == null || _inputReader == null) return;
            var conflicts = _conflictDetector.FindConflicts(_inputReader.GetAllActionMap());
            foreach (var row in GetComponentsInParent<RebindPanel>(includeInactive: true)
                         [0]?.GetRows() ?? Array.Empty<RebindActionRow>())
            {
                row.SetConflictHighlight(conflicts.Contains(row._actionName));
            }
        }
    }
}