using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using Sog;

namespace Game
{
    //玩家server patch 机制,
    //使用场景：老玩家的一些数据随着版本迭代已经不符合当下的需求，或者一些业务存在bug，导致玩家数据不正确，需要修复
    //对应的数据，但是不想把修复代码参合再现有的逻辑中、补丁方式修复，所以建议采用patch 机制，玩家只需要执行一次修复，
    //后续将不用再维护相关的修复逻辑。

    public static class PatchSvc
    {
        private class PatchModel
        {
            public int Id;
            public Func<PlayerOnGame, int> Patch;
        }

        private static readonly ReaderWriterLockSlim Locker = new();

        private static int _maxPatch;

        private static readonly Dictionary<int, PatchModel> AllPatchMethods = new();

        public static void RegisterAll()
        {
            try
            {
                Locker.EnterUpgradeableReadLock();
                try
                {
                    //写锁线程只有一个
                    Locker.EnterWriteLock();
                    
                    AllPatchMethods.Clear();
                    Register(PatchCode.PATCH_CODE_FIX_TEST, FixTest);
                }
                catch (Exception e)
                {
                    TraceLog.Error("Patch.Register register method failed,e={0}", e.Message);
                }
                finally
                {
                    Locker.ExitWriteLock();
                }
            }
            catch (Exception e)
            {
                TraceLog.Error("Patch.Register register method failed,e={0}", e.Message);
            }
            finally
            {
                Locker.ExitUpgradeableReadLock();
            }
        }

        private static void Register(int id, Func<PlayerOnGame, int> method)

        {
            if (method == null)
            {
                return;
            }

            TraceLog.Trace("PatchSvc.Register register method,id={0},name={1}", id, method.Method.Name);
            AllPatchMethods[id] = new PatchModel() { Id = id, Patch = method };
            _maxPatch = Math.Max(_maxPatch, id);
        }

        public static void PatchAll(PlayerOnGame player)
        {
            _Patch(player);
            player.MakeDirty();
        }

        private static void _Patch(PlayerOnGame player)
        {
            try
            {
                Locker.EnterReadLock();
                int position = player.RoleData.ExtData.Patch;
                if (position == _maxPatch)
                {
                    return;
                }

                if (AllPatchMethods.Count == 0)
                {
                    return;
                }

                foreach (var patch in AllPatchMethods.Where(patch => patch.Key > position))
                {
                    try
                    {
                        patch.Value.Patch(player);
                    }
                    catch (Exception e)
                    {
                        TraceLog.Trace("PatchSvc.PatchAll patch failed. id={0},name={1},error info={2}", patch.Key,
                            patch.Value.Patch.Method.Name, e.Message);
                        break;
                    }

                    position = Math.Max(patch.Key, position);
                }

                player.RoleData.ExtData.Patch = position;
            }
            catch (Exception e)
            {
                TraceLog.Trace("PatchSvc.PatchAll patch failed,e={0}", e.Message);
            }
            finally
            {
                Locker.ExitReadLock();
            }
        }

        public static void OnPlayerBorn(PlayerOnGame player)
        {
            int position = 0;
            try
            {
                Locker.EnterReadLock();
                position = _maxPatch;

            }
            catch (Exception e)
            {
               TraceLog.Error("PatchSvc.OnPlayerBorn error: {0}", e.Message);
            }
            finally
            {
                Locker.ExitReadLock();
            }
            player.RoleData.ExtData.Patch = position;
        }

        //---------------------------------------------------------------- 需要修复的逻辑

        public static int FixTest(PlayerOnGame player)
        {
            TraceLog.Trace("test fix data player uid={0}", player.UserID);

            return 0;
        }
    }
}