using System;
using System.Collections.Generic;
using System.Linq;
using Cielonos.MainGame.Rewards;
using Sirenix.OdinInspector;
using SLSUtilities.General;
using UnityEngine;
using UnityEngine.AI;

namespace Cielonos.MainGame.Map
{
    public partial class ZoneManager : Singleton<ZoneManager>
    {
        [Title("Editor Tools")]
        [Button("Rebuild Spawn Points"), PropertyOrder(-100)]
        public void RebuildMapData()
        {
            if(spawnPointContainer == null) 
            {
                Debug.LogWarning("[ZoneManager] Spawn Point Container is not assigned.");
                return;
            }
            
            spawnPoints.Clear();

            // 1. 查找场景中所有生成点
            SpawnPoint[] allPoints = spawnPointContainer.GetComponentsInChildren<SpawnPoint>(true);
            
            // 2. 按 groupName 分组，并按 Hierarchy 顺序排序 (保证 Index 确定性)
            var grouped = allPoints
                .GroupBy(p => p.groupName)
                .OrderBy(g => g.Key);

            foreach (var group in grouped)
            {
                // 按在 Hierarchy 中的顺序排序列表
                var list = group.OrderBy(p => p.transform.GetSiblingIndex()).ToList();
                spawnPoints[group.Key] = list;

                // 3. 将计算好的 Index 写入到具体物体上（持久化）
                for (int i = 0; i < list.Count; i++)
                {
                    list[i].SetData(i); // 调用子物体的方法设置数据
                }
            }
            
            //Debug.Log($"[ZoneManager] Rebuilt map: Found {allPoints.Length} points in {spawnPoints.Count} groups.");
        }
    }
    
    // 继承 Singleton 保持运行时单例特性
    public partial class ZoneManager 
    {
        // 运行时查找用的字典
        [Title("Runtime Data")]
        [Required]
        public GameObject spawnPointContainer;
        public Dictionary<string, List<SpawnPoint>> spawnPoints = new Dictionary<string, List<SpawnPoint>>();
        
        protected override void Awake()
        {
            base.Awake();
            RebuildMapData();
        }

        public void SetupZone(ZoneData data)
        {
            // 生成敌人
            if (data.enemySpawns != null)
            {
                foreach (KeyValuePair<ZoneData.SpawnPointKey, string> enemySpawn in data.enemySpawns)
                {
                    string group = enemySpawn.Key.group;
                    int index = enemySpawn.Key.index;

                    if (spawnPoints.TryGetValue(group, out List<SpawnPoint> points))
                    {
                        SpawnPoint point = points[index];
                        point.GetTransform(out Vector3 position, out Quaternion rotation);
                        GameObject enemyPrefab = MapBaseCollection.Enemies[enemySpawn.Value];
                        Instantiate(enemyPrefab, position, rotation);
                    }
                }
            }

            // 生成交互物体
            SpawnInteractables(data);
        }

        /// <summary>
        /// 仅生成交互物体，跳过敌人生成。用于重入已完成的战斗节点。
        /// </summary>
        public void SetupZoneWithoutEnemies(ZoneData data)
        {
            SpawnInteractables(data);
        }

        /// <summary>
        /// 根据 ZoneData 中配置的 interactableSpawns 动态生成所有配置的交互物体。
        /// </summary>
        private void SpawnInteractables(ZoneData data)
        {
            if (data.interactableSpawns == null) return;

            // 遍历关卡数据中配置的每一种交互物定义
            foreach (var def in data.interactableSpawns)
            {
                // 从全局配置合集查找对应的交互物预制体
                if (!MapBaseCollection.Interactables.TryGetValue(def.interactableId, out GameObject prefab))
                {
                    Debug.LogWarning($"[ZoneManager] 交互物体 '{def.interactableId}' 在 MapBaseCollection.Interactables 中未找到。");
                    continue;
                }

                // 遍历该类型交互物在场景里的所有生成点，逐个进行实例化
                foreach (ZoneData.SpawnPointKey key in def.spawnPoints)
                {
                    if (spawnPoints.TryGetValue(key.group, out List<SpawnPoint> points) && key.index < points.Count)
                    {
                        SpawnPoint point = points[key.index];
                        point.GetTransform(out Vector3 position, out Quaternion rotation);
                        Instantiate(prefab, position, rotation);
                    }
                    else
                    {
                        Debug.LogWarning($"[ZoneManager] 生成点 '{key.group}_{key.index}' 不存在，跳过 '{def.interactableId}' 的生成。");
                    }
                }
            }
        }

        public bool TrySpawnInteractable(string interactableId, out GameObject instance)
        {
            return TrySpawnInteractable(interactableId, interactableId, out instance);
        }

        public bool TrySpawnInteractable(string interactableId, string spawnGroup, out GameObject instance)
        {
            instance = null;
            if (string.IsNullOrWhiteSpace(interactableId))
            {
                return false;
            }

            if (string.IsNullOrWhiteSpace(spawnGroup))
            {
                spawnGroup = interactableId;
            }

            if (!MapBaseCollection.Interactables.TryGetValue(interactableId, out GameObject prefab) || prefab == null)
            {
                Debug.LogWarning($"[ZoneManager] 交互物体 '{interactableId}' 在 MapBaseCollection.Interactables 中未找到。");
                return false;
            }

            if (!spawnPoints.TryGetValue(spawnGroup, out List<SpawnPoint> points) || points == null || points.Count == 0)
            {
                Debug.LogWarning($"[ZoneManager] 交互物体 '{interactableId}' 没有可用生成点 group '{spawnGroup}'。");
                return false;
            }

            SpawnPoint point = points[0];
            point.GetTransform(out Vector3 position, out Quaternion rotation);
            instance = Instantiate(prefab, position, rotation);
            return instance != null;
        }

        public bool TrySpawnInteractable(string interactableId, CombatRewardSpawnRequest request,
            out GameObject instance)
        {
            instance = null;
            if (string.IsNullOrWhiteSpace(interactableId))
            {
                return false;
            }

            if (!MapBaseCollection.Interactables.TryGetValue(interactableId, out GameObject prefab) || prefab == null)
            {
                Debug.LogWarning($"[ZoneManager] 交互物体 '{interactableId}' 在 MapBaseCollection.Interactables 中未找到。");
                return false;
            }

            ResolveRewardSpawnPose(request, out Vector3 position, out Quaternion rotation);
            instance = Instantiate(prefab, position, rotation);
            return instance != null;
        }

        private void ResolveRewardSpawnPose(CombatRewardSpawnRequest request, out Vector3 position,
            out Quaternion rotation)
        {
            string spawnGroup = string.IsNullOrWhiteSpace(request.spawnGroup) ? "CombatReward" : request.spawnGroup;
            float spacing = Mathf.Max(0.25f, request.spacing);
            IReadOnlyList<Vector3> occupiedPositions = request.occupiedPositions;

            if (spawnPoints.TryGetValue(spawnGroup, out List<SpawnPoint> points) && points != null && points.Count > 0)
            {
                int clampedIndex = Mathf.Clamp(request.spawnIndex, 0, points.Count - 1);
                SpawnPoint point = points[clampedIndex];
                point.GetTransform(out position, out rotation);

                if (request.spawnIndex < points.Count && !IsNearOccupiedPosition(position, occupiedPositions, spacing))
                {
                    position = SampleNavMesh(position);
                    return;
                }

                point = points[0];
                point.GetTransform(out Vector3 center, out rotation);
                position = FindOffsetRewardPosition(center, request.spawnIndex - points.Count + 1,
                    spacing, occupiedPositions);
                return;
            }

            Transform playerTransform = MainGameManager.Player != null ? MainGameManager.Player.transform : transform;
            position = request.spawnIndex <= 0
                ? playerTransform.position
                : FindOffsetRewardPosition(playerTransform.position, request.spawnIndex, spacing, occupiedPositions);
            rotation = playerTransform.rotation;
            Debug.LogWarning($"[ZoneManager] 未找到奖励生成点 group '{spawnGroup}'，使用玩家坐标作为 Combat 奖励兜底生成位置。");
        }

        private static Vector3 FindOffsetRewardPosition(Vector3 center, int offsetIndex, float spacing,
            IReadOnlyList<Vector3> occupiedPositions)
        {
            int startIndex = Mathf.Max(0, offsetIndex);
            for (int attempt = 0; attempt < 24; attempt++)
            {
                int candidateIndex = startIndex + attempt;
                int ring = candidateIndex / 8 + 1;
                float angle = candidateIndex * 137.50777f * Mathf.Deg2Rad;
                Vector3 offset = new Vector3(Mathf.Cos(angle), 0f, Mathf.Sin(angle)) * spacing * ring;
                Vector3 candidate = SampleNavMesh(center + offset);
                if (!IsNearOccupiedPosition(candidate, occupiedPositions, spacing))
                {
                    return candidate;
                }
            }

            return SampleNavMesh(center + Vector3.right * spacing * (startIndex + 1));
        }

        private static bool IsNearOccupiedPosition(Vector3 position, IReadOnlyList<Vector3> occupiedPositions,
            float spacing)
        {
            if (occupiedPositions == null)
            {
                return false;
            }

            float minSqrDistance = spacing * spacing;
            for (int i = 0; i < occupiedPositions.Count; i++)
            {
                if ((occupiedPositions[i] - position).sqrMagnitude < minSqrDistance)
                {
                    return true;
                }
            }

            return false;
        }

        private static Vector3 SampleNavMesh(Vector3 position)
        {
            return NavMesh.SamplePosition(position, out NavMeshHit hit, 1.5f, NavMesh.AllAreas)
                ? hit.position
                : position;
        }
    }
}