using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using AOT.Machine;
using AOT.Event;
using YooAsset;

namespace AOT
{
    public class PatchOperation : GameAsyncOperation
    {
        private enum ESteps
        {
            None,
            Update,
            Done,
        }

        private readonly AOT.Event.EventGroup _eventGroup = new AOT.Event.EventGroup();
        private readonly StateMachine _machine;
        private ESteps _steps = ESteps.None;

        public PatchOperation(string packageName, int version, bool isBuildinFileSystem, EPlayMode playMode)
        {
            // 注册监听事件
            _eventGroup.AddListener<UserEventDefine.UserTryInitialize>(OnHandleEventMessage);
            _eventGroup.AddListener<UserEventDefine.UserBeginDownloadWebFiles>(OnHandleEventMessage);
            _eventGroup.AddListener<UserEventDefine.UserTryUpdatePackageVersion>(OnHandleEventMessage);
            _eventGroup.AddListener<UserEventDefine.UserTryUpdatePatchManifest>(OnHandleEventMessage);
            _eventGroup.AddListener<UserEventDefine.UserTryDownloadWebFiles>(OnHandleEventMessage);

            // 创建状态机
            _machine = new StateMachine(this);
            _machine.AddNode<FsmInitializePackage>();
            _machine.AddNode<FsmUpdatePackageVersion>();
            _machine.AddNode<FsmUpdatePackageManifest>();
            _machine.AddNode<FsmCreatePackageDownloader>();
            _machine.AddNode<FsmDownloadPackageFiles>();
            _machine.AddNode<FsmDownloadPackageOver>();
            _machine.AddNode<FsmClearCacheBundle>();
            _machine.AddNode<FsmUpdaterDone>();

            _machine.SetBlackboardValue("PackageName", packageName);
            _machine.SetBlackboardValue("PlayMode", playMode);
            _machine.SetBlackboardValue("Version", version);
            _machine.SetBlackboardValue("isBuildinFileSystem", isBuildinFileSystem);
        }
        protected override void OnStart()
        {
            Debug.Log("Patch - OnStart()");
            _steps = ESteps.Update;
            _machine.Run<FsmInitializePackage>();
        }
        protected override void OnUpdate()
        {
            if (_steps == ESteps.None || _steps == ESteps.Done)
                return;

            if (_steps == ESteps.Update)
            {
                _machine.Update();
                if (_machine.CurrentNode == typeof(FsmUpdaterDone).FullName)
                {
                    _eventGroup.RemoveAllListener();
                    Status = EOperationStatus.Succeed;
                    _steps = ESteps.Done;
                }
            }
        }
        protected override void OnAbort()
        {
        }

        /// <summary>
        /// 接收事件
        /// </summary>
        private void OnHandleEventMessage(AOT.Event.IEventMessage message)
        {
            if (message is UserEventDefine.UserTryInitialize)
            {
                _machine.ChangeState<FsmInitializePackage>();
            }
            else if (message is UserEventDefine.UserBeginDownloadWebFiles)
            {
                _machine.ChangeState<FsmDownloadPackageFiles>();
            }
            else if (message is UserEventDefine.UserTryUpdatePackageVersion)
            {
                _machine.ChangeState<FsmUpdatePackageVersion>();
            }
            else if (message is UserEventDefine.UserTryUpdatePatchManifest)
            {
                _machine.ChangeState<FsmUpdatePackageManifest>();
            }
            else if (message is UserEventDefine.UserTryDownloadWebFiles)
            {
                _machine.ChangeState<FsmCreatePackageDownloader>();
            }
            else
            {
                throw new System.NotImplementedException($"{message.GetType()}");
            }
        }
    }
}