using Prism.Commands;
using System.Collections.ObjectModel;
using System.IO;
using System.Text.Json;
using YY.Admin.Core.Entity;
using YY.Admin.Core.Services;
using YY.Admin.Services.Service;

namespace YY.Admin.ViewModels.RawMaterialEntry;

/// <summary>
/// 「新增原料入场记录」独立页面：左侧表单逻辑继承编辑 VM，右侧展示当日入场简要列表并支持选中回填模板。
/// </summary>
public class RawMaterialEntryOperationViewModel : RawMaterialEntryEditDialogViewModel
{
    private const int TodayListFetchSize = 5000;
    private readonly IRawMaterialCardService _rawMaterialCardService;

    private static readonly JsonSerializerOptions LayoutJsonOpts = new()
    {
        PropertyNameCaseInsensitive = true,
        WriteIndented = true
    };

    private static string LayoutFilePath => Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
        "YY.Admin",
        "raw-material-entry-add-layout.json");

    private bool _suppressTodaySelectionReaction;

    public ObservableCollection<MesXslRawMaterialEntry> TodayEntries { get; } = new();

    public IReadOnlyList<string> DateRangeOptions { get; } =
        ["今日", "过去24小时", "过去48小时", "过去72小时"];

    private string _selectedDateRange = "今日";
    public string SelectedDateRange
    {
        get => _selectedDateRange;
        set
        {
            if (SetProperty(ref _selectedDateRange, value))
                _ = LoadTodayEntriesAsync();
        }
    }

    private MesXslRawMaterialEntry? _selectedTodayEntry;
    public MesXslRawMaterialEntry? SelectedTodayEntry
    {
        get => _selectedTodayEntry;
        set
        {
            if (!SetProperty(ref _selectedTodayEntry, value)) return;
            if (_suppressTodaySelectionReaction || value == null) return;
            _ = ApplyTodayRowToFormAsync(value);
        }
    }

    private bool _isRightPanelExpanded = true;
    public bool IsRightPanelExpanded
    {
        get => _isRightPanelExpanded;
        set
        {
            if (!SetProperty(ref _isRightPanelExpanded, value)) return;
            SaveLayoutState();
        }
    }

    private double _expandedRightPanelWidth = 280;
    /// <summary>右侧面板展开时的目标宽度（像素），由 GridSplitter 拖拽结束时回写。</summary>
    public double ExpandedRightPanelWidth
    {
        get => _expandedRightPanelWidth;
        private set
        {
            var v = Math.Clamp(value, 200, 560);
            if (SetProperty(ref _expandedRightPanelWidth, v))
                SaveLayoutState();
        }
    }

    /// <summary>
    /// 「生成原材料卡片」按钮可用条件：
    /// 入场记录已保存（有 Id）且至少存在一行「未生成卡片 + 份数>0」的明细。
    /// 已打印态下用户「继续拆码」新增了行，按钮自动重新可用；全部行都已生成卡片时不可用。
    /// </summary>
    public bool CanGenerateCards =>
        !string.IsNullOrWhiteSpace(Entry?.Id)
        && SplitCodeDetails.Any(d => !d.HasCard && (d.Portions ?? 0) > 0);

    public DelegateCommand ToggleRightPanelCommand { get; }
    public DelegateCommand RefreshTodayEntriesCommand { get; }
    public DelegateCommand GenerateRawMaterialCardsCommand { get; }
    /// <summary>「重新拆码」：清除已生成的卡片 + 清空明细，仅在编辑态可用。</summary>
    public DelegateCommand ResplitCommand { get; }

    public RawMaterialEntryOperationViewModel(
        IRawMaterialEntryService entryService,
        IJeecgDictSyncService dictSyncService,
        IMixerMaterialService mixerMaterialService,
        IRawMaterialCardService rawMaterialCardService,
        IContainerExtension container,
        IRegionManager regionManager)
        : base(entryService, dictSyncService, mixerMaterialService, container, regionManager)
    {
        _rawMaterialCardService = rawMaterialCardService;
        LoadLayoutState();
        ToggleRightPanelCommand = new DelegateCommand(() => IsRightPanelExpanded = !IsRightPanelExpanded);
        RefreshTodayEntriesCommand = new DelegateCommand(async () => await LoadTodayEntriesAsync());
        GenerateRawMaterialCardsCommand = new DelegateCommand(async () => await GenerateRawMaterialCardsAsync());
        ResplitCommand = new DelegateCommand(async () => await ResplitAsync(), () => CanResplit)
            .ObservesProperty(() => Entry);
        // 集合变化：批量重订阅 item.PropertyChanged 监听 HasCard/Portions，并同步刷新两个 Can*。
        SplitCodeDetails.CollectionChanged += OnSplitCodeDetailsCollectionChangedForCanFlags;
    }

    /// <summary>
    /// 「重新拆码」按钮可用条件：入场记录已保存 + 至少有一行已生成卡片。
    /// 全是新增未生成的行时，用户直接点「删除」即可，无需走「清空卡片」流程。
    /// </summary>
    public bool CanResplit =>
        !string.IsNullOrWhiteSpace(Entry?.Id)
        && SplitCodeDetails.Any(d => d.HasCard);

    /// <summary>
    /// 集合变化时：对新增/移除的 item 维护 PropertyChanged 订阅，并刷新两个 Can* 属性。
    /// HasCard / Portions 变化会让「生成原材料卡片」和「重新拆码」按钮可用性同步刷新。
    /// </summary>
    private void OnSplitCodeDetailsCollectionChangedForCanFlags(
        object? sender,
        System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
    {
        if (e.OldItems != null)
        {
            foreach (RawMaterialSplitDetailItem o in e.OldItems)
                o.PropertyChanged -= OnSplitDetailHasCardChanged;
        }
        if (e.NewItems != null)
        {
            foreach (RawMaterialSplitDetailItem n in e.NewItems)
                n.PropertyChanged += OnSplitDetailHasCardChanged;
        }
        RaisePropertyChanged(nameof(CanGenerateCards));
        RaisePropertyChanged(nameof(CanResplit));
        ResplitCommand.RaiseCanExecuteChanged();
    }

    private void OnSplitDetailHasCardChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
    {
        if (e.PropertyName is nameof(RawMaterialSplitDetailItem.HasCard)
            or nameof(RawMaterialSplitDetailItem.Portions))
        {
            RaisePropertyChanged(nameof(CanGenerateCards));
            RaisePropertyChanged(nameof(CanResplit));
            ResplitCommand.RaiseCanExecuteChanged();
        }
    }

    public override void InitializeForAdd()
    {
        _suppressTodaySelectionReaction = true;
        _selectedTodayEntry = null;
        RaisePropertyChanged(nameof(SelectedTodayEntry));
        _suppressTodaySelectionReaction = false;
        base.InitializeForAdd();
        RaisePropertyChanged(nameof(CanGenerateCards));
    }

    /// <summary>页面首次加载时拉取「今日」列表（由 View Loaded 调用）。</summary>
    public async Task LoadTodayEntriesOnFirstShowAsync() => await LoadTodayEntriesAsync();

    /// <summary>用户在拖拽结束 GridSplitter 后提交实际列宽。</summary>
    public void CommitRightPanelWidthFromView(double actualWidth)
    {
        if (!IsRightPanelExpanded || actualWidth < 1) return;
        ExpandedRightPanelWidth = actualWidth;
    }

    private async Task LoadTodayEntriesAsync()
    {
        try
        {
            IsLoading = true;
            var result = await EntryService.PageAsync(1, TodayListFetchSize);
            DateTime? threshold = _selectedDateRange switch
            {
                "过去24小时" => DateTime.Now.AddHours(-24),
                "过去48小时" => DateTime.Now.AddHours(-48),
                "过去72小时" => DateTime.Now.AddHours(-72),
                _            => null   // "今日"：按自然日过滤
            };
            var rows = result.Records
                .Where(e => IsInRange(e, threshold))
                .OrderByDescending(e => e.EntryTime ?? e.CreateTime ?? DateTime.MinValue)
                .ToList();
            TodayEntries.Clear();
            foreach (var r in rows)
                TodayEntries.Add(r);
        }
        catch
        {
            // 列表失败不阻断左侧新增（与物料加载策略一致）
        }
        finally
        {
            IsLoading = false;
        }
    }

    private static bool IsInRange(MesXslRawMaterialEntry e, DateTime? threshold)
    {
        if (threshold == null)
        {
            var today = DateTime.Today;
            return (e.EntryTime?.Date == today) || (e.CreateTime?.Date == today);
        }
        return (e.EntryTime >= threshold) || (e.CreateTime >= threshold);
    }

    /// <summary>
    /// 点击右侧今日记录：直接以「编辑模式」加载源记录到左侧表单（保留 Id/条码/批次号），
    /// 不再走「新增模板」逻辑，避免重新生成条码、覆盖原数据。
    /// </summary>
    private async Task ApplyTodayRowToFormAsync(MesXslRawMaterialEntry src)
    {
        // 复用基类 InitializeForEdit：保留 Id/Barcode/BatchNo/状态等所有字段，标题自动切到「编辑原料入场记录」
        base.InitializeForEdit(src);
        RaisePropertyChanged(nameof(CanGenerateCards));

        // 若物料列表此前未加载导致选中项未回填，则补一次拉取（与编辑弹窗逻辑一致）
        if (_pendingMaterialId != null)
            await LoadMaterialOptionsAsync();
    }

    /// <summary>
    /// 保存成功后：无论新增还是编辑，都立即刷新右侧「今日入场」列表。
    /// 编辑成功额外把表单切回「新增态」，避免用户连续误改同一条；新增成功后由基类负责清空表单。
    /// </summary>
    protected override async Task SaveAsync()
    {
        var wasEdit = !IsAddMode;
        await base.SaveAsync();
        RaisePropertyChanged(nameof(CanGenerateCards));

        if (!Result || CloseAction != null)
        {
            return;
        }

        await LoadTodayEntriesAsync();

        if (wasEdit)
        {
            HandyControl.Controls.MessageBox.Success("编辑成功！");
            InitializeForAdd();
        }
    }

    /// <summary>
    /// 「重新拆码」：弹窗预提示「将清除 N 张原材料卡片」→ 确认 → 后端按 splitDetailId IN 批删
    /// → 清空 SplitCodeDetails → Entry.PrintFlag=0 → EditAsync(Entry) 持久化新状态 → 刷新今日列表。
    /// 流程对应「清空卡片重新生成」的业务诉求；用户可立即重新维护明细并再次「生成原材料卡片」。
    /// </summary>
    private async Task ResplitAsync()
    {
        if (Entry == null || string.IsNullOrWhiteSpace(Entry.Id))
        {
            HandyControl.Controls.MessageBox.Warning("请先选中一条已保存的入场记录后再「重新拆码」。");
            return;
        }
        var detailIds = SplitCodeDetails
            .Select(d => d.Id)
            .Where(id => !string.IsNullOrWhiteSpace(id))
            .Distinct()
            .ToList();

        try
        {
            IsLoading = true;

            // dryRun 预查：统计当前明细行已生成的卡片数量
            var cardCount = detailIds.Count > 0
                ? await _rawMaterialCardService.DeleteBySplitDetailIdsAsync(detailIds, dryRun: true)
                : 0;
            if (cardCount < 0)
            {
                HandyControl.Controls.MessageBox.Error("无法连接服务器，重新拆码已取消。");
                return;
            }

            var confirm = HandyControl.Controls.MessageBox.Show(
                $"当前入场记录已生成 {cardCount} 条原材料卡片，是否清空卡片重新生成？",
                "重新拆码",
                System.Windows.MessageBoxButton.OKCancel,
                System.Windows.MessageBoxImage.Question);
            if (confirm != System.Windows.MessageBoxResult.OK)
            {
                return;
            }

            // 真正执行批删（即使 cardCount=0 也调用一次，结果幂等）
            if (cardCount > 0)
            {
                var deleted = await _rawMaterialCardService.DeleteBySplitDetailIdsAsync(detailIds, dryRun: false);
                if (deleted < 0)
                {
                    HandyControl.Controls.MessageBox.Error("清除已生成的原材料卡片失败，重新拆码已中止。");
                    return;
                }
            }

            // 清空明细 + 重置打印标记，并把变更持久化到后端入场记录
            SplitCodeDetails.Clear();
            Entry.PrintFlag = "0";
            ApplySplitDetailsToEntry(); // 同步把 PortionDetailIds 等清空到 Entry 上
            var ok = await EntryService.EditAsync(Entry);
            if (!ok)
            {
                HandyControl.Controls.MessageBox.Error("保存重新拆码后的入场记录失败，请刷新后重试。");
                return;
            }

            RaisePropertyChanged(nameof(Entry));
            RaisePropertyChanged(nameof(IsPrinted));
            RaisePropertyChanged(nameof(IsTotalWeightEditable));
            AddSplitDetailCommand.RaiseCanExecuteChanged();
            RaisePropertyChanged(nameof(CanGenerateCards));
            RaisePropertyChanged(nameof(CanResplit));
            HandyControl.Controls.MessageBox.Success($"已清除 {cardCount} 条原材料卡片，请重新维护拆码明细。");
            await LoadTodayEntriesAsync();
        }
        catch (Exception ex)
        {
            HandyControl.Controls.MessageBox.Error($"重新拆码失败：{ex.Message}");
        }
        finally
        {
            IsLoading = false;
        }
    }

    /// <summary>
    /// 「生成原材料卡片」：仅处理 HasCard==false 的明细行（「继续拆码」流程的核心）。
    /// 条码续号 = 已有卡片总数（Σ HasCard==true 行的 Portions）+ 1，避免与已生成卡片的条码冲突。
    /// 成功生成的行置 HasCard=true，Entry.PrintFlag=1（整票级标记）。
    /// </summary>
    private async Task GenerateRawMaterialCardsAsync()
    {
        if (Entry == null || string.IsNullOrWhiteSpace(Entry.Id))
        {
            HandyControl.Controls.MessageBox.Warning("请先保存入场记录再生成原材料卡片！");
            return;
        }

        // 只处理未生成卡片的行 + 份数>0；已生成行直接跳过，避免重复加卡和条码冲突
        var pendingRows = SplitCodeDetails
            .Where(d => !d.HasCard && (d.Portions ?? 0) > 0)
            .ToList();
        if (pendingRows.Count == 0)
        {
            HandyControl.Controls.MessageBox.Warning("当前没有待生成卡片的拆码明细（已生成的行不会重复处理）。请先「新增明细」再生成。");
            return;
        }

        // 库位必填仅校验本批待生成行；行号取在原集合的真实索引，避免编号偏移误导
        foreach (var row in pendingRows)
        {
            if (string.IsNullOrWhiteSpace(row.WarehouseLocation))
            {
                var realIndex = SplitCodeDetails.IndexOf(row);
                HandyControl.Controls.MessageBox.Warning($"拆码明细第 {realIndex + 1} 行的「库位」未填写，请点击该行库位选择库区后再生成原材料卡片。");
                return;
            }
        }

        // 总重核对：拆码明细合计 vs 基础资料总重
        {
            var splitTotal = SplitCodeDetails.Sum(d => (d.PortionWeight ?? 0d) * (d.Portions ?? 0));
            var basicTotal = Entry.TotalWeight ?? 0d;
            if (Math.Abs(splitTotal - basicTotal) > 0.01d)
            {
                string hint;
                if (splitTotal > basicTotal)
                    hint = $"本次打印拆码总重 {splitTotal:0.##}，超出基础资料总重 {basicTotal:0.##}，超出部分是否需要核对？";
                else
                    hint = $"本次打印拆码总重 {splitTotal:0.##}，少于基础资料总重 {basicTotal:0.##}，剩余部分将无法继续拆码，是否继续？";
                var confirm = System.Windows.MessageBox.Show(
                    hint,
                    "总重核对",
                    System.Windows.MessageBoxButton.OKCancel,
                    System.Windows.MessageBoxImage.Warning);
                if (confirm != System.Windows.MessageBoxResult.OK) return;
            }
        }

        try
        {
            IsLoading = true;
            // 续号起点：已有卡片数 = Σ HasCard==true 行的 Portions；新增卡片从其后续编
            var alreadyGenerated = SplitCodeDetails
                .Where(d => d.HasCard)
                .Sum(d => d.Portions ?? 0);
            var globalIndex = alreadyGenerated + 1;
            var baseBarcode = Entry.Barcode ?? "";
            var failCount = 0;
            var newCardCount = 0;
            // 按行收集成功标记：只要该行所有份都加卡成功，行 HasCard=true；
            // 中途任一份失败则保留 HasCard=false，下次再点「生成」时会重试该行
            var rowSuccessMap = new Dictionary<RawMaterialSplitDetailItem, bool>();

            foreach (var detail in pendingRows)
            {
                var portions = detail.Portions ?? 0;
                var rowAllOk = true;
                for (var i = 0; i < portions; i++)
                {
                    var card = new MesXslRawMaterialCard
                    {
                        // 关联到当前拆码明细行 — 便于「重新拆码」按此 ID 批删
                        SplitDetailId = detail.Id,
                        Barcode = baseBarcode + globalIndex.ToString("D3"),
                        BatchNo = Entry.BatchNo,
                        EntryDate = Entry.EntryTime?.Date ?? DateTime.Today,
                        MaterialId = Entry.MaterialId,
                        MaterialName = Entry.MaterialName,
                        SupplierId = Entry.SupplierId,
                        SupplierName = Entry.SupplierName,
                        ManufacturerMaterialName = Entry.ManufacturerMaterialName,
                        ShelfLife = Entry.ShelfLife,
                        TotalWeight = detail.PortionWeight.HasValue ? (decimal?)detail.PortionWeight.Value : null,
                        RemainingWeight = detail.PortionWeight.HasValue ? (decimal?)detail.PortionWeight.Value : null,
                        RemainingQuantity = detail.PortionPackages,
                        WarehouseArea = detail.WarehouseLocation,
                        UnloadOperator = Entry.UnloadOperator,
                        Status = "1",
                        TestResult = "0",
                        PriorityPickup = "0",
                        TenantId = Entry.TenantId
                    };
                    var ok = await _rawMaterialCardService.AddAsync(card);
                    if (ok) newCardCount++;
                    else { failCount++; rowAllOk = false; }
                    globalIndex++;
                }
                rowSuccessMap[detail] = rowAllOk;
            }

            // 把整行加卡都成功的标记 HasCard=true（触发该行 UI 自动锁定 + 删除按钮隐藏 + 打印列显示「已打印」）
            foreach (var kv in rowSuccessMap)
            {
                if (kv.Value) kv.Key.HasCard = true;
            }

            // 整票级 PrintFlag：只要本批至少有一张卡片成功即置 1（与原行为兼容）。
            // 关键：必须先 ApplySplitDetailsToEntry()，把刚被设为 true 的 HasCard 序列化到 PortionCardFlags，
            // 否则下次重新打开时该行会回退为 false（PortionCardFlags 旧值未更新），从而被「继续拆码」流程误纳入待生成。
            if (newCardCount > 0)
            {
                Entry.PrintFlag = "1";
                ApplySplitDetailsToEntry();
                await EntryService.EditAsync(Entry);
                RaisePropertyChanged(nameof(Entry));
                RaisePropertyChanged(nameof(IsPrinted));
                RaisePropertyChanged(nameof(IsTotalWeightEditable));
                AddSplitDetailCommand.RaiseCanExecuteChanged();
            }
            RaisePropertyChanged(nameof(CanGenerateCards));
            RaisePropertyChanged(nameof(CanResplit));

            if (failCount == 0)
                HandyControl.Controls.MessageBox.Success($"已生成 {newCardCount} 张原材料卡片（累计 {alreadyGenerated + newCardCount} 张），打印状态已更新为「已打印」！");
            else
                HandyControl.Controls.MessageBox.Warning($"本次共尝试生成 {newCardCount + failCount} 张，成功 {newCardCount} 张，失败 {failCount} 张。失败的行未标记为「已打印」，可检查网络后再次点击「生成原材料卡片」重试。");
        }
        catch (Exception ex)
        {
            HandyControl.Controls.MessageBox.Error($"生成原材料卡片失败：{ex.Message}");
        }
        finally
        {
            IsLoading = false;
        }
    }

    private void LoadLayoutState()
    {
        try
        {
            if (!File.Exists(LayoutFilePath)) return;
            var json = File.ReadAllText(LayoutFilePath);
            var dto = JsonSerializer.Deserialize<AddPageLayoutDto>(json, LayoutJsonOpts);
            if (dto == null) return;
            if (dto.ExpandedWidth is > 0 and < 2000)
                _expandedRightPanelWidth = Math.Clamp(dto.ExpandedWidth.Value, 200, 560);
            if (dto.IsExpanded.HasValue)
                _isRightPanelExpanded = dto.IsExpanded.Value;
            RaisePropertyChanged(nameof(ExpandedRightPanelWidth));
            RaisePropertyChanged(nameof(IsRightPanelExpanded));
        }
        catch { /* 布局文件损坏时忽略 */ }
    }

    private void SaveLayoutState()
    {
        try
        {
            var dir = Path.GetDirectoryName(LayoutFilePath);
            if (!string.IsNullOrEmpty(dir))
                Directory.CreateDirectory(dir);
            var dto = new AddPageLayoutDto
            {
                ExpandedWidth = _expandedRightPanelWidth,
                IsExpanded = _isRightPanelExpanded
            };
            File.WriteAllText(LayoutFilePath, JsonSerializer.Serialize(dto, LayoutJsonOpts));
        }
        catch { /* 写本地失败时不影响业务 */ }
    }

    private sealed class AddPageLayoutDto
    {
        public double? ExpandedWidth { get; set; }
        public bool? IsExpanded { get; set; }
    }
}