using FATrace.Model;
using FATrace.WPLApp.Core;
using FATrace.WPLApp.Services;
using FreeSql;
using Prism.Commands;
using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using System.Windows;

namespace FATrace.WPLApp.ViewModels
{
    /// <summary>
    /// 文件导入日志 查询 VM（展示 FileImportLog）
    /// </summary>
    public class FileImportLogViewModel : NavigationViewModel
    {
        private readonly IFreeSql _fsql;
        private readonly ILogService _log;

        public FileImportLogViewModel(IFreeSql fsql, ILogService log)
        {
            _fsql = fsql;
            _log = log;

            Items = new ObservableCollection<FileImportLog>();

            SearchCommand = new DelegateCommand(async () => await SearchAsync(), () => !IsBusy)
                .ObservesProperty(() => IsBusy);
            ClearCommand = new DelegateCommand(ClearFilters, () => !IsBusy)
                .ObservesProperty(() => IsBusy);

            FirstPageCommand = new DelegateCommand(async () => { if (PageIndex == 1) return; PageIndex = 1; await SearchAsync(); }, () => !IsBusy && PageIndex > 1)
                .ObservesProperty(() => IsBusy)
                .ObservesProperty(() => PageIndex);
            PrevPageCommand = new DelegateCommand(async () => { if (PageIndex <= 1) return; PageIndex -= 1; await SearchAsync(); }, () => !IsBusy && PageIndex > 1)
                .ObservesProperty(() => IsBusy)
                .ObservesProperty(() => PageIndex);
            NextPageCommand = new DelegateCommand(async () => { if (PageIndex >= TotalPages) return; PageIndex += 1; await SearchAsync(); }, () => !IsBusy && PageIndex < TotalPages)
                .ObservesProperty(() => IsBusy)
                .ObservesProperty(() => PageIndex)
                .ObservesProperty(() => TotalPages);
            LastPageCommand = new DelegateCommand(async () => { if (TotalPages <= 0 || PageIndex == TotalPages) return; PageIndex = TotalPages; await SearchAsync(); }, () => !IsBusy && PageIndex < TotalPages)
                .ObservesProperty(() => IsBusy)
                .ObservesProperty(() => PageIndex)
                .ObservesProperty(() => TotalPages);
        }

        #region 查询条件
        private string? _fileName;
        /// <summary>
        /// 文件名（模糊匹配）
        /// </summary>
        public string? FileName
        {
            get => _fileName;
            set { _fileName = value; RaisePropertyChanged(); }
        }

        private string? _status;
        /// <summary>
        /// 状态（模糊匹配，例如 Success/Failed）
        /// </summary>
        public string? Status
        {
            get => _status;
            set { _status = value; RaisePropertyChanged(); }
        }

        private string? _keyword;
        /// <summary>
        /// 关键字（匹配 SourcePath/ArchivePath/Message/SheetRowStats）
        /// </summary>
        public string? Keyword
        {
            get => _keyword;
            set { _keyword = value; RaisePropertyChanged(); }
        }

        private DateTime? _startDate;
        /// <summary>
        /// 导入开始日期起（基于 StartTime）
        /// </summary>
        public DateTime? StartDate
        {
            get => _startDate;
            set { _startDate = value; RaisePropertyChanged(); }
        }

        private DateTime? _endDate;
        /// <summary>
        /// 导入开始日期止（基于 StartTime，包含当天）
        /// </summary>
        public DateTime? EndDate
        {
            get => _endDate;
            set { _endDate = value; RaisePropertyChanged(); }
        }
        #endregion

        #region 列表与分页
        public ObservableCollection<FileImportLog> Items { get; }

        private bool _isBusy;
        public bool IsBusy
        {
            get => _isBusy;
            set { _isBusy = value; RaisePropertyChanged(); }
        }

        private int _totalCount;
        public int TotalCount
        {
            get => _totalCount;
            set { _totalCount = value; RaisePropertyChanged(); }
        }

        private int _pageIndex = 1;
        public int PageIndex
        {
            get => _pageIndex;
            set { _pageIndex = value < 1 ? 1 : value; RaisePropertyChanged(); }
        }

        private int _pageSize = 20;
        public int PageSize
        {
            get => _pageSize;
            set
            {
                var v = value <= 0 ? 20 : value;
                if (_pageSize != v)
                {
                    _pageSize = v;
                    RaisePropertyChanged();
                    PageIndex = 1;
                    if (!IsBusy) _ = SearchAsync();
                }
            }
        }

        private int _totalPages;
        public int TotalPages
        {
            get => _totalPages;
            set { _totalPages = value; RaisePropertyChanged(); }
        }
        #endregion

        #region 命令
        public DelegateCommand SearchCommand { get; }
        public DelegateCommand ClearCommand { get; }
        public DelegateCommand FirstPageCommand { get; }
        public DelegateCommand PrevPageCommand { get; }
        public DelegateCommand NextPageCommand { get; }
        public DelegateCommand LastPageCommand { get; }
        #endregion

        private void ClearFilters()
        {
            FileName = string.Empty;
            Status = string.Empty;
            Keyword = string.Empty;
            StartDate = null;
            EndDate = null;
        }

        private async Task SearchAsync()
        {
            if (IsBusy) return;
            try
            {
                IsBusy = true;
                _log.Info("FileImportLog 查询开始");

                var data = await Task.Run(() =>
                {
                    var q = _fsql.Select<FileImportLog>();

                    if (!string.IsNullOrWhiteSpace(FileName))
                        q = q.Where(a => a.FileName != null && a.FileName.Contains(FileName));
                    if (!string.IsNullOrWhiteSpace(Status))
                        q = q.Where(a => a.Status != null && a.Status.Contains(Status));

                    if (!string.IsNullOrWhiteSpace(Keyword))
                    {
                        var kw = Keyword;
                        q = q.Where(a =>
                            (a.SourcePath != null && a.SourcePath.Contains(kw))
                            || (a.ArchivePath != null && a.ArchivePath.Contains(kw))
                            || (a.Message != null && a.Message.Contains(kw))
                            || (a.SheetRowStats != null && a.SheetRowStats.Contains(kw))
                        );
                    }

                    DateTime? start = StartDate;
                    DateTime? end = EndDate;
                    if (start.HasValue)
                    {
                        var s = start.Value.Date;
                        q = q.Where(a => a.StartTime >= s);
                    }
                    if (end.HasValue)
                    {
                        var e = end.Value.Date.AddDays(1).AddTicks(-1);
                        q = q.Where(a => a.StartTime <= e);
                    }

                    q = q.OrderByDescending(a => a.Id);

                    var page = PageIndex < 1 ? 1 : PageIndex;
                    var size = PageSize <= 0 ? 20 : PageSize;

                    var list = q.Count(out var total)
                        .Page(page, size)
                        .ToList();

                    var pages = total <= 0 || size <= 0 ? 0 : (int)Math.Ceiling(total * 1.0 / size);
                    if (pages > 0 && page > pages)
                    {
                        page = pages;
                        list = q.Page(page, size).ToList();
                    }

                    return (items: list, total: (int)total, normalizedPage: page, totalPages: pages);
                });

                Application.Current.Dispatcher.Invoke(() =>
                {
                    Items.Clear();
                    foreach (var it in data.items) Items.Add(it);
                    TotalCount = data.total;
                    TotalPages = data.totalPages;
                    PageIndex = data.normalizedPage == 0 ? 1 : data.normalizedPage;
                });

                _log.Info($"FileImportLog 查询完成，记录数: {TotalCount}");
            }
            catch (Exception ex)
            {
                _log.Error($"FileImportLog 查询失败: {ex}");
                MessageBox.Show($"查询失败: {ex.Message}", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                IsBusy = false;
            }
        }

        public override async void OnNavigatedTo(Prism.Regions.NavigationContext navigationContext)
        {
            await SearchAsync();
        }
    }
}