using AI.AgentIntegration;
using DevExpress.XtraBars.Docking2010.Views.Tabbed;
using GeoSigma.UCDraw.Service;
using GeoSigma.UCDraw.UC;
using GeoSigmaDrawLib;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using PcgDrawR.Services;
using Document = DevExpress.XtraBars.Docking2010.Views.Tabbed.Document;

namespace PcgDrawR
{
    /// <summary>
    /// 应用程序控制器的实现类，用于管理应用程序的状态和操作
    /// </summary>
    public class AppController : IAppController, IAppEnvironment
    {
        /// <summary>
        /// 当应用程序状态发生变化时触发的事件
        /// </summary>
        public event EventHandler<AppState> StateChanged;

        private static readonly Lazy<AppController> lazy = new Lazy<AppController>(() =>
            new AppController());

        private readonly AppState state = new AppState();

        private readonly NavigationService navigationService;

        private readonly FileTabService fileTabService;

        private readonly GriddingModuleService griddingModuleService;

        private readonly ImportService importService;

        private UCDrawEdit? ActiveUCDrawEdit => MainForm?.TabbedView1?.ActiveDocument?.Control as UCDrawEdit;

        private GeoSigmaXY? ActivateUCDrawEditGeo => ActiveUCDrawEdit?.DrawerView?.ViewControl?.Geo;

        /// <summary>
        /// 获取全局唯一的 AppController 实例
        /// </summary>
        public static AppController Instance => lazy.Value;

        private AppController()
        {
            navigationService = new NavigationService(this);
            fileTabService = new FileTabService(this);
            griddingModuleService = new GriddingModuleService(this);
            importService = new ImportService(this);

            RegisterHandlers();
        }

        /// <summary>
        /// 获取或设置主窗口引用
        /// </summary>
        public FormMain MainForm { get; set; }

        private readonly Dictionary<AppActionType, Func<AppAction, Task<AppActionResult>>> actionMap =
            new Dictionary<AppActionType, Func<AppAction, Task<AppActionResult>>>();

        /// <summary>
        /// 获取应用程序的当前状态
        /// </summary>
        /// <returns>当前应用程序状态</returns>
        public AppState GetCurrentState()
        {
            RefreshUIState();
            return state;
        }

        private void RegisterHandlers()
        {
            // 扫描当前类所有的方法
            var methods = this.GetType().GetMethods(
                System.Reflection.BindingFlags.Instance |
                System.Reflection.BindingFlags.NonPublic |
                System.Reflection.BindingFlags.Public);

            foreach (var method in methods)
            {
                // 获取方法上的 ActionHandler 特性
                var attr = method.GetCustomAttributes(typeof(ActionHandlerAttribute), false)
                                 .FirstOrDefault() as ActionHandlerAttribute;

                if (attr != null)
                {
                    // 创建强类型委托 (要求方法签名必须匹配)
                    try
                    {
                        var handler = (Func<AppAction, Task<AppActionResult>>)
                            Delegate.CreateDelegate(typeof(Func<AppAction, Task<AppActionResult>>), this, method);

                        // 注册到字典
                        actionMap[attr.ActionType] = handler;
                    }
                    catch (ArgumentException)
                    {
                        // 这里可以加日志，提示方法签名不对 (必须是 Task<AppActionResult> Func(AppAction a))
                    }
                }
            }
        }

        /// <summary>
        /// 执行指定的应用程序操作
        /// </summary>
        /// <param name="action">要执行的操作</param>
        /// <returns>操作执行结果</returns>
        public async Task<AppActionResult> ExecuteAsync(AppAction action)
        {
            if (actionMap.TryGetValue(action.Action, out var handler))
            {
                try
                {
                    var result = await handler(action);
                    return result;
                }
                catch (Exception ex)
                {
                    return AppActionResult.Fail($"执行异常: {ex.Message}");
                }
            }

            return AppActionResult.Fail($"未支持的操作类型: {action.Action}");
        }

        [ActionHandler(AppActionType.SaveFile)]
        protected async Task<AppActionResult> SaveFileAsync(AppAction action)
        {
            var result = await fileTabService.SaveFileAsync(action);
            if (result.Success)
            {
                UpdateState("SaveFile");
            }
            return result;
        }

        [ActionHandler(AppActionType.DescribeState)]
        protected Task<AppActionResult> DescribeStateAsync(AppAction action)
        {
            return navigationService.DescribeStateAsync(action);
        }

        [ActionHandler(AppActionType.SetBusy)]
        protected async Task<AppActionResult> SetBusyAsync(AppAction action)
        {
            var result = await navigationService.SetBusyAsync(action);
            UpdateState("SetBusy");
            return result;
        }

        [ActionHandler(AppActionType.Navigate)]
        protected async Task<AppActionResult> NavigateAsync(AppAction action)
        {
            var result = await navigationService.NavigateAsync(action);
            UpdateState("Navigate");
            return result;
        }

        [ActionHandler(AppActionType.NavigateBack)]
        protected async Task<AppActionResult> NavigateBackAsync(AppAction action)
        {
            var result = await navigationService.NavigateBackAsync(action);
            if (result.Success)
            {
                UpdateState("NavigateBack");
            }
            return result;
        }

        [ActionHandler(AppActionType.NavigateForward)]
        protected async Task<AppActionResult> NavigateForwardAsync(AppAction action)
        {
            var result = await navigationService.NavigateForwardAsync(action);
            UpdateState("NavigateForward");
            return result;
        }

        [ActionHandler(AppActionType.SwitchTab)]
        protected Task<AppActionResult> SwitchTabAsync(AppAction action)
        {
            SwitchTabTo(action);
            UpdateState("SwitchTab");
            return Task.FromResult(Success());
        }

        [ActionHandler(AppActionType.CloseAllFiles)]
        protected async Task<AppActionResult> CloseAllFilesAsync(AppAction action)
        {
            var result = await fileTabService.CloseAllFilesAsync(action);
            if (result.Success)
            {
                UpdateState("CloseAllFiles");
            }
            return result;
        }

        [ActionHandler(AppActionType.GetOpenTabs)]
        protected Task<AppActionResult> GetOpenTabsAsync(AppAction action)
        {
            return navigationService.GetOpenTabsAsync(action);
        }

        [ActionHandler(AppActionType.CloseFile)]
        protected async Task<AppActionResult> CloseFileAsync(AppAction action)
        {
            var result = await fileTabService.CloseFileAsync(action);
            if (result.Success)
            {
                UpdateState("CloseFile");
            }
            return result;
        }

        [ActionHandler(AppActionType.Undo)]
        protected Task<AppActionResult> UndoAsync(AppAction action)
        {
            var edit = ActiveUCDrawEdit;
            if (edit == null)
                return Task.FromResult(Fail("当前没有打开任何图件"));
            MainForm.Invoke(() => edit.DrawerView?.ToolUndo());
            UpdateState("Undo");
            return Task.FromResult(Success());
        }

        [ActionHandler(AppActionType.Redo)]
        protected Task<AppActionResult> RedoAsync(AppAction action)
        {
            var edit = ActiveUCDrawEdit;
            if (edit == null)
                return Task.FromResult(Fail("当前没有打开任何图件"));
            MainForm.Invoke(() => edit.DrawerView?.ToolRedo());
            UpdateState("Redo");
            return Task.FromResult(Success());
        }

        [ActionHandler(AppActionType.Refresh)]
        protected async Task<AppActionResult> RefreshAsync(AppAction action)
        {
            var result = await navigationService.RefreshAsync(action);
            UpdateState("Refresh");
            return result;
        }

        [ActionHandler(AppActionType.Exit)]
        protected Task<AppActionResult> ExitAsync(AppAction action)
        {
            return navigationService.ExitAsync(action);
        }

        [ActionHandler(AppActionType.RenameFile)]
        protected async Task<AppActionResult> RenameFileAsync(AppAction action)
        {
            var result = await fileTabService.RenameFileAsync(action);
            if (result.Success)
            {
                UpdateState("RenameFile");
            }
            return result;
        }

        [ActionHandler(AppActionType.SaveAll)]
        protected Task<AppActionResult> SaveAllAsync(AppAction action)
        {
            return fileTabService.SaveAllAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleGetParameters)]
        protected Task<AppActionResult> GriddingModuleGetParametersAsync(AppAction action)
        {
            return griddingModuleService.GetParametersAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleSetParameters)]
        protected Task<AppActionResult> GriddingModuleSetParametersAsync(AppAction action)
        {
            return griddingModuleService.SetParametersAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleGetColumns)]
        protected Task<AppActionResult> GrddingModuleGetColumns(AppAction action)
        {
            return griddingModuleService.GetColumnsAsync(action);
        }


        /// <summary>
        /// 打开指定路径的文件
        /// </summary>
        /// <param name="action">包含文件路径参数的操作</param>
        /// <returns>操作执行结果</returns>
        [ActionHandler(AppActionType.OpenFile)]
        protected AppActionResult OpenFile(AppAction action)
        {
            var result = fileTabService.OpenFile(action);
            if (result.Success)
            {
                UpdateState("OpenFile");
            }
            return result;
        }

        [ActionHandler(AppActionType.ReloadFile)]
        protected AppActionResult ReloadFile()
        {
            return fileTabService.ReloadFile(new AppAction { Action = AppActionType.ReloadFile });
        }

        /// <summary>
        /// 切换到指定标签页
        /// </summary>
        /// <param name="action">包含标签页标识符参数的操作</param>
        /// <returns>操作执行结果</returns>
        protected AppActionResult SwitchTabTo(AppAction action)
        {
            if (!action.Parameters.TryGetValue("tab", out var tabObj))
            {
                return Fail("缺少 'tab' 参数");
            }

            var tab = tabObj.ToString();

            MainForm.Invoke(() => MainForm.ActivateTab = tab);
            UpdateState("OpenFile");
            return Success();
        }

        [ActionHandler(AppActionType.AddScaleBar)]
        protected Task<AppActionResult> AddScaleBar(AppAction action)
        {
            return griddingModuleService.AddScaleBarAsync(action);
        }

        [ActionHandler(AppActionType.AddBorder)]
        protected Task<AppActionResult> AddBorder(AppAction action)
        {
            return Task.FromResult(Fail("添加失败: 当前没有打开任何图件"));
        }

        [ActionHandler(AppActionType.AddLegend)]
        protected Task<AppActionResult> AddLegend(AppAction action)
        {
            return griddingModuleService.AddLegendAsync(action);
        }

        /// <summary>
        /// 更新应用程序状态
        /// </summary>
        /// <param name="lastCommand">最后执行的命令名称</param>
        private void UpdateState(string lastCommand)
        {
            state.Agent.LastCommand = lastCommand;
            state.Agent.LastResult = "success";
            state.System.LastActionTimeUtc = DateTime.UtcNow;
            StateChanged?.Invoke(this, state);
        }

        /// <summary>
        /// 刷新用户界面状态
        /// </summary>
        private void RefreshUIState()
        {
            state.UI.OpenTabs = MainForm.OpenTabs;
            state.UI.ActiveTab = MainForm.ActivateTab;
        }

        [ActionHandler(AppActionType.GriddingModuleLoadXyz)]
        protected async Task<AppActionResult> GriddingModuleLoadXyzAsync(AppAction action)
        {
            return await griddingModuleService.LoadXyzAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleMatchColumns)]
        protected Task<AppActionResult> GriddingModuleMatchColumnsAsync(AppAction action)
        {
            return griddingModuleService.MatchColumnsAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleImport)]
        protected async Task<AppActionResult> GriddingModuleImportAsync(AppAction action)
        {
            return await griddingModuleService.ImportAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModuleRun)]
        protected async Task<AppActionResult> GriddingModuleRunAsync(AppAction action)
        {
            return await griddingModuleService.RunAsync(action);
        }

        [ActionHandler(AppActionType.GriddingModulePreviewData)]
        protected Task<AppActionResult> GriddingPreviewData(AppAction action)
        {
            return griddingModuleService.PreviewDataAsync(action);
        }

        [ActionHandler(AppActionType.WellModuleImportWellPoints)]
        protected Task<AppActionResult> WellModuleImportWellPointsAsync(AppAction action)
        {
            return importService.ImportWellPointsAsync(action);
        }

        [ActionHandler(AppActionType.WellModuleImportCurves)]
        protected Task<AppActionResult> WellModuleImportCurvesAsync(AppAction action)
        {
            return importService.ImportWellCurvesAsync(action);
        }

        /// <summary>
        /// 创建一个表示成功操作结果的对象
        /// </summary>
        /// <param name="data">操作返回的数据</param>
        /// <returns>表示成功操作结果的对象</returns>
        private AppActionResult Success(object data = null)
        {
            return new AppActionResult { Success = true, Data = data };
        }

        /// <summary>
        /// 创建一个表示失败操作结果的对象
        /// </summary>
        /// <param name="message">失败消息</param>
        /// <returns>表示失败操作结果的对象</returns>
        private AppActionResult Fail(string message)
        {
            return new AppActionResult { Success = false, Message = message };
        }

        private PanelGraph GetActivePanelGraph()
        {
            if (ActiveUCDrawEdit == null)
            {
                throw new InvalidOperationException("当前界面不存在或不是平面图，无法获取成图面板，请新建图件或者打开");
            }

            if (ActiveUCDrawEdit.GraphControl == null)
            {
                throw new InvalidOperationException("成图面板不存在，无法成图");
            }

            return ActiveUCDrawEdit.GraphControl;
        }

        FormMain IAppEnvironment.MainForm => MainForm;

        AppState IAppEnvironment.State => state;

        UCDrawEdit? IAppEnvironment.ActiveUCDrawEdit => ActiveUCDrawEdit;

        GeoSigmaXY? IAppEnvironment.ActiveGeo => ActivateUCDrawEditGeo;
    }
}