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.Services.Service;
using YY.Admin.Services.Service.Customer;
using YY.Admin.Views.Customer;

namespace YY.Admin.ViewModels.Customer;

public class CustomerListViewModel : BaseViewModel
{
    private readonly ICustomerService _customerService;
    private readonly IJeecgDictSyncService _dictSyncService;
    private readonly IDialogService _dialogService;
    private SubscriptionToken? _customerChangedToken;
    private SubscriptionToken? _syncConflictToken;

    private ObservableCollection<MesXslCustomer> _customers = new();
    public ObservableCollection<MesXslCustomer> Customers
    {
        get => _customers;
        set => SetProperty(ref _customers, 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? _filterCustomerCode;
    public string? FilterCustomerCode { get => _filterCustomerCode; set => SetProperty(ref _filterCustomerCode, value); }

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

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

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

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

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

    public CustomerListViewModel(
        ICustomerService customerService,
        IJeecgDictSyncService dictSyncService,
        IContainerExtension container,
        IDialogService dialogService,
        IRegionManager regionManager) : base(container, regionManager)
    {
        _customerService = customerService;
        _dictSyncService = dictSyncService;
        _dialogService = dialogService;

        SearchCommand = new DelegateCommand(async () => { PageNo = 1; await LoadAsync(); });
        ResetCommand = new DelegateCommand(async () =>
        {
            FilterCustomerCode = null; FilterCustomerName = null;
            FilterStatus = null; FilterCustomerRegion = null;
            PageNo = 1; await LoadAsync();
        });
        AddCommand = new DelegateCommand(async () => await ShowAddDialogAsync());
        EditCommand = new DelegateCommand<MesXslCustomer>(async c => await ShowEditDialogAsync(c));
        DeleteCommand = new DelegateCommand<MesXslCustomer>(async c => await DeleteAsync(c));
        ToggleStatusCommand = new DelegateCommand<MesXslCustomer>(async c => await ToggleStatusAsync(c));
        PrevPageCommand = new DelegateCommand(async () => { if (PageNo > 1) { PageNo--; await LoadAsync(); } });
        NextPageCommand = new DelegateCommand(async () => { if ((long)PageNo * PageSize < Total) { PageNo++; await LoadAsync(); } });

        _customerChangedToken = _eventAggregator.GetEvent<CustomerChangedEvent>()
            .Subscribe(async p => await OnCustomerChangedAsync(p), ThreadOption.UIThread);

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

        _ = InitializeAsync();
    }

    private async Task OnCustomerChangedAsync(CustomerChangedPayload payload)
    {
        if (payload.Action == "edit" && !string.IsNullOrWhiteSpace(payload.CustomerId))
        {
            await RefreshSingleAsync(payload.CustomerId!);
        }
        else
        {
            await LoadAsync();
        }
    }

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

    private void OnSyncConflict(SyncConflictPayload payload)
    {
        if (!string.Equals(payload.EntityName, "客户", 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
        {
            await LoadDictOptionsAsync();
            await UIHelper.WaitForRenderAsync();
            await LoadAsync();
        }
        catch (Exception ex)
        {
            Debug.WriteLine($"客户列表初始化失败: {ex.Message}");
        }
    }

    private async Task LoadDictOptionsAsync()
    {
        try
        {
            var statusOpts = await _dictSyncService.GetDictOptionsAsync("xslmes_customer_status", includeAll: true);
            var regionOpts = await _dictSyncService.GetDictOptionsAsync("xslmes_customer_region", includeAll: true);

            StatusOptions.Clear();
            foreach (var item in statusOpts) StatusOptions.Add(item);
            CustomerRegionOptions.Clear();
            foreach (var item in regionOpts) CustomerRegionOptions.Add(item);

            if (StatusOptions.Count == 0)
            {
                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"));
            }
            if (CustomerRegionOptions.Count == 0)
                CustomerRegionOptions.Add(new KeyValuePair<string, string>("全部", ""));
        }
        catch
        {
            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"));
            CustomerRegionOptions.Clear();
            CustomerRegionOptions.Add(new KeyValuePair<string, string>("全部", ""));
        }
    }

    public async Task LoadAsync()
    {
        try
        {
            IsLoading = true;
            var result = await _customerService.PageAsync(PageNo, PageSize,
                FilterCustomerCode, FilterCustomerName, FilterStatus, FilterCustomerRegion);
            Customers = new ObservableCollection<MesXslCustomer>(result.Records);
            Total = result.Total;
        }
        catch (Exception ex)
        {
            Growl.Error($"加载客户列表失败：{ex.Message}");
        }
        finally
        {
            IsLoading = false;
        }
    }

    private async Task ShowAddDialogAsync()
    {
        try
        {
            var result = await HandyControl.Controls.Dialog.Show<CustomerEditDialogView>()
                .Initialize<CustomerEditDialogViewModel>(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(MesXslCustomer customer)
    {
        if (customer == null) return;
        try
        {
            var result = await HandyControl.Controls.Dialog.Show<CustomerEditDialogView>()
                .Initialize<CustomerEditDialogViewModel>(vm => vm.InitializeForEdit(customer))
                .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(MesXslCustomer customer)
    {
        if (customer?.Id == null) return;
        var confirm = System.Windows.MessageBox.Show(
            $"确定删除客户【{customer.CustomerName}】？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 _customerService.DeleteAsync(customer.Id);
        if (ok) { Growl.Success("删除成功！"); await LoadAsync(); }
        else Growl.Error("删除失败！");
    }

    private async Task ToggleStatusAsync(MesXslCustomer customer)
    {
        if (customer?.Id == null) return;
        var newStatus = customer.Status == "1" ? "0" : "1";
        var ok = await _customerService.UpdateStatusAsync(customer.Id, newStatus);
        if (ok)
        {
            // 客户列表离线场景下只改行对象字段，DataGrid 对计算列(StatusText)可能不会立即重绘。
            // 这里统一重载一次列表，确保状态、筛选结果和分页统计立即一致。
            await LoadAsync();
        }
        else Growl.Error("状态切换失败！");
    }

    protected override void CleanUp()
    {
        base.CleanUp();
        if (_customerChangedToken != null)
        {
            _eventAggregator.GetEvent<CustomerChangedEvent>().Unsubscribe(_customerChangedToken);
            _customerChangedToken = null;
        }

        if (_syncConflictToken != null)
        {
            _eventAggregator.GetEvent<SyncConflictEvent>().Unsubscribe(_syncConflictToken);
            _syncConflictToken = null;
        }
    }
}