using HandyControl.Controls;
using HandyControl.Tools.Extension;
using Prism.Events;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Windows;
using YY.Admin.Core;
using YY.Admin.Core.Events;
using YY.Admin.Core.Helper;
using YY.Admin.Core.Entity;
using YY.Admin.Core.Services;
using YY.Admin.Views.WarehouseArea;

namespace YY.Admin.ViewModels.WarehouseArea;

public class WarehouseAreaListViewModel : BaseViewModel
{
    private readonly IWarehouseAreaService _warehouseAreaService;
    private readonly IWarehouseService _warehouseService;
    private readonly IDialogService _dialogService;
    private SubscriptionToken? _changedToken;
    private SubscriptionToken? _syncConflictToken;

    private ObservableCollection<MesXslWarehouseArea> _areas = new();
    public ObservableCollection<MesXslWarehouseArea> Areas
    {
        get => _areas;
        set => SetProperty(ref _areas, value);
    }

    private long _total;
    public long Total { get => _total; set => SetProperty(ref _total, value); }

    private int _pageNo = 1;
    public int PageNo { get => _pageNo; set => SetProperty(ref _pageNo, value); }

    private int _pageSize = 20;
    public int PageSize { get => _pageSize; set => SetProperty(ref _pageSize, value); }

    private string? _filterAreaCode;
    public string? FilterAreaCode { get => _filterAreaCode; set => SetProperty(ref _filterAreaCode, value); }

    private string? _filterAreaName;
    public string? FilterAreaName { get => _filterAreaName; set => SetProperty(ref _filterAreaName, value); }

    private string? _filterWarehouseId;
    public string? FilterWarehouseId { get => _filterWarehouseId; set => SetProperty(ref _filterWarehouseId, value); }

    private string? _filterStatus;
    public string? FilterStatus { get => _filterStatus; set => SetProperty(ref _filterStatus, value); }

    public ObservableCollection<KeyValuePair<string, string>> WarehouseOptions { get; } = new();
    public ObservableCollection<KeyValuePair<string, string>> StatusOptions { get; } = new();

    public DelegateCommand SearchCommand { get; }
    public DelegateCommand ResetCommand { get; }
    public DelegateCommand AddCommand { get; }
    public DelegateCommand<MesXslWarehouseArea> EditCommand { get; }
    public DelegateCommand<MesXslWarehouseArea> DeleteCommand { get; }
    public DelegateCommand<MesXslWarehouseArea> ToggleStatusCommand { get; }
    public DelegateCommand PrevPageCommand { get; }
    public DelegateCommand NextPageCommand { get; }

    public WarehouseAreaListViewModel(
        IWarehouseAreaService warehouseAreaService,
        IWarehouseService warehouseService,
        IContainerExtension container,
        IDialogService dialogService,
        IRegionManager regionManager) : base(container, regionManager)
    {
        _warehouseAreaService = warehouseAreaService;
        _warehouseService = warehouseService;
        _dialogService = dialogService;

        SearchCommand = new DelegateCommand(async () => { PageNo = 1; await LoadAsync(); });
        ResetCommand = new DelegateCommand(async () =>
        {
            FilterAreaCode = null;
            FilterAreaName = null;
            FilterWarehouseId = null;
            FilterStatus = null;
            PageNo = 1;
            await LoadAsync();
        });
        AddCommand = new DelegateCommand(async () => await ShowAddDialogAsync());
        EditCommand = new DelegateCommand<MesXslWarehouseArea>(async a => await ShowEditDialogAsync(a));
        DeleteCommand = new DelegateCommand<MesXslWarehouseArea>(async a => await DeleteAsync(a));
        ToggleStatusCommand = new DelegateCommand<MesXslWarehouseArea>(async a => await ToggleStatusAsync(a));
        PrevPageCommand = new DelegateCommand(async () => { if (PageNo > 1) { PageNo--; await LoadAsync(); } });
        NextPageCommand = new DelegateCommand(async () => { if ((long)PageNo * PageSize < Total) { PageNo++; await LoadAsync(); } });

        _changedToken = _eventAggregator
            .GetEvent<WarehouseAreaChangedEvent>()
            .Subscribe(async p => await OnChangedAsync(p), ThreadOption.UIThread);

        _syncConflictToken = _eventAggregator.GetEvent<SyncConflictEvent>()
            .Subscribe(OnSyncConflict, ThreadOption.UIThread);

        _ = InitializeAsync();
    }

    private async Task OnChangedAsync(WarehouseAreaChangedPayload payload)
    {
        if (payload.Action == "edit" && !string.IsNullOrWhiteSpace(payload.WarehouseAreaId))
            await RefreshSingleAsync(payload.WarehouseAreaId!);
        else
            await LoadAsync();
    }

    private async Task RefreshSingleAsync(string id)
    {
        try
        {
            var updated = await _warehouseAreaService.GetByIdAsync(id);
            if (updated == null) return;
            var idx = Areas.ToList().FindIndex(a => string.Equals(a.Id, id, StringComparison.OrdinalIgnoreCase));
            if (idx >= 0) Areas[idx] = updated;
        }
        catch (Exception ex)
        {
            Debug.WriteLine($"[库区] 单条刷新失败: {ex.Message}");
        }
    }

    private void OnSyncConflict(SyncConflictPayload payload)
    {
        if (!string.Equals(payload.EntityName, "库区", StringComparison.OrdinalIgnoreCase)) return;

        var parts = new List<string>();
        if (payload.PushedCount > 0) parts.Add($"已同步 {payload.PushedCount} 条本地改动到服务器");
        if (payload.NewRecordsPushed > 0) parts.Add($"已上传 {payload.NewRecordsPushed} 条本地新增记录");
        if (payload.ConflictCount > 0) parts.Add($"{payload.ConflictCount} 条记录与服务器版本冲突，已保留服务器版本");

        if (parts.Count == 0) return;
        var message = string.Join("\n", parts);
        if (payload.ConflictCount > 0) Growl.Warning(message);
        else Growl.Success(message);
    }

    private async Task InitializeAsync()
    {
        try
        {
            StatusOptions.Clear();
            StatusOptions.Add(new KeyValuePair<string, string>("全部", ""));
            StatusOptions.Add(new KeyValuePair<string, string>("启用", "0"));
            StatusOptions.Add(new KeyValuePair<string, string>("停用", "1"));

            await LoadWarehouseOptionsAsync();
            await UIHelper.WaitForRenderAsync();
            await LoadAsync();
        }
        catch (Exception ex)
        {
            Debug.WriteLine($"库区列表初始化失败: {ex.Message}");
        }
    }

    private async Task LoadWarehouseOptionsAsync()
    {
        try
        {
            var warehouses = await _warehouseService.GetAllAsync();
            WarehouseOptions.Clear();
            WarehouseOptions.Add(new KeyValuePair<string, string>("全部", ""));
            foreach (var w in warehouses.Where(w => !string.IsNullOrWhiteSpace(w.Id)))
                WarehouseOptions.Add(new KeyValuePair<string, string>(w.WarehouseName ?? w.Id!, w.Id!));
        }
        catch (Exception ex)
        {
            Debug.WriteLine($"[库区] 加载仓库选项失败: {ex.Message}");
            if (WarehouseOptions.Count == 0)
                WarehouseOptions.Add(new KeyValuePair<string, string>("全部", ""));
        }
    }

    public async Task LoadAsync()
    {
        try
        {
            IsLoading = true;
            var result = await _warehouseAreaService.PageAsync(PageNo, PageSize, FilterAreaCode, FilterAreaName, FilterWarehouseId, FilterStatus);
            Areas = new ObservableCollection<MesXslWarehouseArea>(result.Records);
            Total = result.Total;
        }
        catch (Exception ex)
        {
            Growl.Error($"加载库区列表失败：{ex.Message}");
        }
        finally
        {
            IsLoading = false;
        }
    }

    private async Task ShowAddDialogAsync()
    {
        try
        {
            var result = await HandyControl.Controls.Dialog.Show<WarehouseAreaEditDialogView>()
                .Initialize<WarehouseAreaEditDialogViewModel>(vm => vm.InitializeForAdd())
                .GetResultAsync<bool>();
            if (result) await LoadAsync();
        }
        catch (Exception ex)
        {
            Growl.Error($"打开新增对话框失败：{ex.Message}");
        }
    }

    private async Task ShowEditDialogAsync(MesXslWarehouseArea area)
    {
        if (area == null) return;
        try
        {
            var result = await HandyControl.Controls.Dialog.Show<WarehouseAreaEditDialogView>()
                .Initialize<WarehouseAreaEditDialogViewModel>(vm => vm.InitializeForEdit(area))
                .GetResultAsync<bool>();
            if (result) await LoadAsync();
        }
        catch (Exception ex)
        {
            Growl.Error($"打开编辑对话框失败：{ex.Message}");
        }
    }

    private async Task DeleteAsync(MesXslWarehouseArea area)
    {
        if (area?.Id == null) return;
        var confirm = System.Windows.MessageBox.Show($"确定删除库区「{area.AreaCode}」？此操作不可恢复！", "确认删除",
            MessageBoxButton.OKCancel, MessageBoxImage.Question);
        if (confirm != System.Windows.MessageBoxResult.OK) return;

        var ok = await _warehouseAreaService.DeleteAsync(area.Id);
        if (ok) { Growl.Success("删除成功！"); await LoadAsync(); }
        else Growl.Error("删除失败！");
    }

    private async Task ToggleStatusAsync(MesXslWarehouseArea area)
    {
        if (area?.Id == null) return;
        var newStatus = area.Status == "1" ? "0" : "1";
        var ok = await _warehouseAreaService.UpdateStatusAsync(area.Id, newStatus);
        if (ok) { area.Status = newStatus; RaisePropertyChanged(nameof(Areas)); }
        else Growl.Error("状态切换失败！");
    }

    protected override void CleanUp()
    {
        base.CleanUp();
        if (_changedToken != null)
        {
            _eventAggregator.GetEvent<WarehouseAreaChangedEvent>().Unsubscribe(_changedToken);
            _changedToken = null;
        }
        if (_syncConflictToken != null)
        {
            _eventAggregator.GetEvent<SyncConflictEvent>().Unsubscribe(_syncConflictToken);
            _syncConflictToken = null;
        }
    }
}