using System;
using System.Linq;
using System.Threading.Tasks;
using AI.AgentIntegration;
using DevExpress.XtraBars.Docking2010.Views.Tabbed;

namespace PcgDrawR.Services
{
    /// <summary>
    /// 负责文件和标签页相关的具体操作。
    /// </summary>
    public class FileTabService
    {
        private readonly IAppEnvironment env;

        public FileTabService(IAppEnvironment env)
        {
            this.env = env ?? throw new ArgumentNullException(nameof(env));
        }

        public Task<AppActionResult> SaveFileAsync(AppAction action)
        {
            var edit = env.ActiveUCDrawEdit;
            if (edit == null)
            {
                return Task.FromResult(Fail("当前没有打开任何图件"));
            }

            bool result = env.MainForm.Invoke(() => edit.SaveFile());
            if (result)
            {
                env.State.File.HasUnsavedChanges = false;
                return Task.FromResult(Success());
            }

            return Task.FromResult(Fail("保存失败"));
        }

        public Task<AppActionResult> CloseAllFilesAsync(AppAction action)
        {
            env.MainForm.Invoke(() =>
            {
                foreach (Document doc in env.MainForm.TabbedView1.Documents.Cast<Document>().ToList())
                {
                    env.MainForm.TabbedView1.Controller.Close(doc);
                }
            });

            env.State.File.HasUnsavedChanges = false;
            env.State.File.ActiveFilePath = string.Empty;
            return Task.FromResult(Success());
        }

        public Task<AppActionResult> CloseFileAsync(AppAction action)
        {
            env.MainForm.Invoke(() =>
            {
                var doc = env.MainForm.TabbedView1?.ActiveDocument;
                if (doc != null)
                {
                    env.MainForm.TabbedView1.Controller.Close(doc);
                }
            });

            env.State.File.HasUnsavedChanges = false;
            env.State.File.ActiveFilePath = string.Empty;
            return Task.FromResult(Success());
        }

        public Task<AppActionResult> SaveAllAsync(AppAction action)
        {
            env.MainForm.Invoke(() => env.MainForm.SaveAll());
            return Task.FromResult(Success());
        }

        public AppActionResult OpenFile(AppAction action)
        {
            if (!action.Parameters.TryGetValue("path", out var pathObj))
            {
                return Fail("缺少 'path' 参数");
            }

            var path = pathObj.ToString();

            bool result = env.MainForm.Invoke(() => env.MainForm.OpenFile(path));
            if (!result)
            {
                return Fail("打开图件失败");
            }

            env.State.File.ActiveFilePath = path;
            env.State.File.FileType = System.IO.Path.GetExtension(path).TrimStart('.');
            env.State.File.HasUnsavedChanges = false;

            return Success();
        }

        public AppActionResult ReloadFile(AppAction action)
        {
            env.MainForm.Invoke(() => env.MainForm.ReloadFile());
            return Success();
        }

        public Task<AppActionResult> RenameFileAsync(AppAction action)
        {
            if (!action.Parameters.TryGetValue("newName", out var nameObj))
            {
                return Task.FromResult(Fail("缺少 'newName' 参数"));
            }

            string newName = nameObj.ToString();
            env.State.File.ActiveFilePath = newName;

            return Task.FromResult(Success($"已重命名为 {newName}"));
        }

        private AppActionResult Success(object data = null)
        {
            return new AppActionResult { Success = true, Data = data };
        }

        private AppActionResult Fail(string message)
        {
            return new AppActionResult { Success = false, Message = message };
        }
    }
}