using System.Collections.Generic;
using UnityEngine;
using BaseGames.Core;
using BaseGames.Core.Save;
using BaseGames.Platform;

namespace BaseGames.Progression
{
    /// <summary>
    /// 成就运行时状态（不存档，仅运行时追踪）。
    /// </summary>
    public class AchievementRuntimeState
    {
        public AchievementSO Achievement;
        public bool          IsUnlocked;
        public float         Progress;   // 0-1，用于 UI 进度条
    }

    /// <summary>
    /// 成就管理器（架构 16_SupportingModules §2.3）。
    /// 负责加载所有 AchievementSO、轮询条件、解锁成就并同步到平台服务。
    /// </summary>
    public class AchievementManager : MonoBehaviour, ISaveable, IAchievementService
    {
        [Header("成就资产")]
        [Tooltip("将所有 AchievementSO 拖入此列表")]
        [SerializeField] private AchievementSO[] _achievements;

        [Header("事件频道")]
        [SerializeField] private AchievementEventChannelSO _onAchievementUnlocked;

        [Tooltip("成就授予凹槽时发布；EquipmentManager 订阅后调用 IncreaseNotches(1)。")]
        [SerializeField] private VoidEventChannelSO _onNotchGranted;

        // ── 运行时状态 ─────────────────────────────────────────────────────────
        private readonly Dictionary<string, AchievementRuntimeState> _states = new();


        private void Awake()
        {
            if (ServiceLocator.GetOrDefault<IAchievementService>() != null) { Destroy(gameObject); return; }
            ServiceLocator.Register<IAchievementService>(this);
            InitStates();
        }

        private void OnEnable()  => ServiceLocator.GetOrDefault<ISaveableRegistry>()?.Register(this);
        private void OnDisable() => ServiceLocator.GetOrDefault<ISaveableRegistry>()?.Unregister(this);

        private void OnDestroy()
        {
            ServiceLocator.Unregister<IAchievementService>(this);
        }

        private void InitStates()
        {
            _states.Clear();
            if (_achievements == null) return;
            foreach (var ach in _achievements)
            {
                if (ach == null || string.IsNullOrEmpty(ach.achievementId)) continue;
                _states[ach.achievementId] = new AchievementRuntimeState
                {
                    Achievement = ach,
                    IsUnlocked  = false,
                    Progress    = 0f,
                };
            }
        }

        // ── ISaveable ─────────────────────────────────────────────────────────
        public void OnSave(SaveData saveData)
        {
            if (saveData?.Achievements == null) return;
            saveData.Achievements.Unlocked.Clear();
            saveData.Achievements.Progress.Clear();

            foreach (var kv in _states)
            {
                if (kv.Value.IsUnlocked)
                    saveData.Achievements.Unlocked.Add(kv.Key);
                else if (kv.Value.Progress > 0f)
                    saveData.Achievements.Progress[kv.Key] = new AchievementProgress { Percent = kv.Value.Progress };
            }
        }

        public void OnLoad(SaveData saveData)
        {
            if (saveData?.Achievements == null) return;

            foreach (var id in saveData.Achievements.Unlocked)
            {
                if (_states.TryGetValue(id, out var state))
                    state.IsUnlocked = true;
            }
            foreach (var kv in saveData.Achievements.Progress)
            {
                if (_states.TryGetValue(kv.Key, out var state))
                    state.Progress = kv.Value.Percent;
            }

            // 加载后立即重新评估所有未解锁成就，避免离线满足条件的成就须等到下次游戏事件才触发。
            EvaluateAll(saveData);
        }

        // ── 轮询检查 ──────────────────────────────────────────────────────────
        /// <summary>
        /// 使用最新存档数据检查所有未解锁成就的条件。
        /// 由 SaveManager.AfterLoad 或外部定期调用（例如每次进入房间）。
        /// </summary>
        public void EvaluateAll(SaveData save)
        {
            foreach (var state in _states.Values)
            {
                if (state.IsUnlocked) continue;
                EvaluateSingle(state, save);
            }
        }

        private void EvaluateSingle(AchievementRuntimeState state, SaveData save)
        {
            if (state.Achievement.conditions == null || state.Achievement.conditions.Length == 0) return;

            bool allMet = true;
            float totalProgress = 0f;

            foreach (var cond in state.Achievement.conditions)
            {
                if (cond == null) continue;
                if (!cond.IsMet(save)) { allMet = false; }
                totalProgress += cond.GetProgress(save);
            }

            int condCount = state.Achievement.conditions.Length;
            state.Progress = condCount > 0 ? totalProgress / condCount : 0f;

            if (allMet)
                Unlock(state);
        }

        // ── 主动解锁 ──────────────────────────────────────────────────────────
        /// <summary>直接解锁成就（用于剧情触发等无条件解锁场景）。</summary>
        public void UnlockById(string achievementId)
        {
            if (_states.TryGetValue(achievementId, out var state) && !state.IsUnlocked)
                Unlock(state);
        }

        private void Unlock(AchievementRuntimeState state)
        {
            state.IsUnlocked = true;
            state.Progress   = 1f;
            _onAchievementUnlocked?.Raise(state.Achievement);

#if STEAMWORKS_NET
            ServiceLocator.Get<IPlatformService>()?.UnlockAchievement(state.Achievement.achievementId);
#endif

            // 若成就授予凹槽，通过事件通知 EquipmentManager 更新运行时状态；
            // 不直接写 SaveData，避免与 EquipmentManager.OnSave 的数据竞争。
            if (state.Achievement.grantsNotch)
                _onNotchGranted?.Raise();

            Debug.Log($"[Achievement] 解锁：{state.Achievement.displayName} ({state.Achievement.achievementId})");
        }

        // ── 查询接口 ──────────────────────────────────────────────────────────
        public bool IsUnlocked(string id)
            => _states.TryGetValue(id, out var s) && s.IsUnlocked;

        public float GetProgress(string id)
            => _states.TryGetValue(id, out var s) ? s.Progress : 0f;

        public IEnumerable<AchievementRuntimeState> GetAllStates()
            => _states.Values;
    }
}