using Microsoft.Extensions.Configuration;
using System.Net.Http;
using System.IO;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Web;
using Prism.Events;
using YY.Admin.Core;
using YY.Admin.Core.Entity;
using YY.Admin.Core.Events;
using YY.Admin.Core.Services;

namespace YY.Admin.Services.Service.RawMaterialEntry;

public class RawMaterialEntryService : IRawMaterialEntryService, ISingletonDependency
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly IConfiguration _configuration;
    private readonly INetworkMonitor _networkMonitor;
    private readonly IEventAggregator _eventAggregator;
    private readonly ILoggerService _logger;
    private readonly SemaphoreSlim _syncLock = new(1, 1);
    private readonly object _cacheLock = new();
    private readonly string _pendingOpsFilePath;
    private readonly string _cacheFilePath;
    private List<EntryPendingOperation> _pendingOps = new();
    private List<MesXslRawMaterialEntry> _localCache = new();

    private static readonly JsonSerializerOptions _jsonOpts = new()
    {
        PropertyNameCaseInsensitive = true,
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        Converters = { new NullableDateTimeJsonConverter() }
    };

    public RawMaterialEntryService(
        IHttpClientFactory httpClientFactory,
        IConfiguration configuration,
        INetworkMonitor networkMonitor,
        IEventAggregator eventAggregator,
        ILoggerService logger)
    {
        _httpClientFactory = httpClientFactory;
        _configuration = configuration;
        _networkMonitor = networkMonitor;
        _eventAggregator = eventAggregator;
        _logger = logger;

        var appDataDir = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
            "YY.Admin", "sync-cache");
        Directory.CreateDirectory(appDataDir);
        _pendingOpsFilePath = Path.Combine(appDataDir, "mes-xsl-raw-material-entry-pending-ops.json");
        _cacheFilePath = Path.Combine(appDataDir, "mes-xsl-raw-material-entry-cache.json");

        LoadPendingOpsFromDisk();
        LoadCacheFromDisk();
        _logger.Information($"[原料入场] 服务初始化完成，缓存={_localCache.Count}，待上传={_pendingOps.Count}，在线={_networkMonitor.IsOnline}");

        _networkMonitor.StatusChanged += OnNetworkStatusChanged;
        if (_networkMonitor.IsOnline)
        {
            _ = Task.Run(() => SyncAfterReconnectAsync(CancellationToken.None));
        }
    }

    private const int MaxPendingRetries = 5;
    private string BaseUrl => (_configuration.GetValue<string>("JeecgIntegration:BaseUrl") ?? "http://localhost:8080/jeecg-boot").TrimEnd('/');
    private int DefaultTenantId => (int?)_configuration.GetValue<long?>("JeecgIntegration:DefaultTenantId") ?? 1002;

    private HttpClient CreateClient() => _httpClientFactory.CreateClient("JeecgApi");

    public async Task<RawMaterialEntryPageResult> PageAsync(
        int pageNo, int pageSize,
        string? barcode = null, string? batchNo = null, string? billNo = null,
        string? materialName = null, string? supplierName = null,
        CancellationToken ct = default)
    {
        List<MesXslRawMaterialEntry>? source = null;
        if (_networkMonitor.IsOnline)
        {
            try
            {
                source = await FetchRemoteListAsync(ct).ConfigureAwait(false);
                lock (_cacheLock)
                {
                    _localCache = source.Select(Clone).ToList();
                    SaveCacheToDiskUnsafe();
                }
                _logger.Information($"[原料入场列表] 远端拉取成功 count={source.Count}");
            }
            catch (Exception ex)
            {
                source = null;
                _logger.Warning($"[原料入场列表] 远端拉取失败，回退缓存：{ex.Message}");
            }
        }

        lock (_cacheLock)
        {
            source ??= _localCache.Select(Clone).ToList();
            source = ApplyPendingOpsSnapshotUnsafe(source);
        }

        var filtered = ApplyFilters(source, barcode, batchNo, billNo, materialName, supplierName);
        var total = filtered.Count;
        var pageRecords = filtered.Skip(Math.Max(0, (pageNo - 1) * pageSize)).Take(pageSize).ToList();
        return new RawMaterialEntryPageResult(pageRecords, total, pageNo, pageSize);
    }

    public async Task<MesXslRawMaterialEntry?> GetByIdAsync(string id, CancellationToken ct = default)
    {
        if (_networkMonitor.IsOnline)
        {
            try
            {
                var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/queryById?id={Uri.EscapeDataString(id)}&tenantId={DefaultTenantId}";
                using var client = CreateClient();
                var resp = await client.GetAsync(url, ct).ConfigureAwait(false);
                if (!resp.IsSuccessStatusCode) return null;
                var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
                using var doc = JsonDocument.Parse(json);
                if (!doc.RootElement.TryGetProperty("result", out var resultEl)) return null;
                return resultEl.Deserialize<MesXslRawMaterialEntry>(_jsonOpts);
            }
            catch (Exception ex)
            {
                _logger.Warning($"[原料入场详情] 远端查询失败，回退缓存 id={id}：{ex.Message}");
            }
        }

        lock (_cacheLock)
        {
            return _localCache.FirstOrDefault(e => string.Equals(e.Id, id, StringComparison.OrdinalIgnoreCase)) is { } found
                ? Clone(found) : null;
        }
    }

    public async Task<bool> AddAsync(MesXslRawMaterialEntry entry, CancellationToken ct = default)
    {
        if (!entry.TenantId.HasValue || entry.TenantId.Value <= 0) entry.TenantId = DefaultTenantId;
        var local = Clone(entry);
        if (string.IsNullOrWhiteSpace(local.Id)) local.Id = $"local-{Guid.NewGuid():N}";

        if (_networkMonitor.IsOnline)
        {
            try
            {
                var ok = await RemoteAddAsync(local, ct).ConfigureAwait(false);
                if (ok) { UpsertLocalCache(local); return true; }
                return false;
            }
            catch (Exception ex)
            {
                _logger.Warning($"[原料入场新增] 远端失败，转离线 id={local.Id}：{ex.Message}");
            }
        }

        EnqueuePendingOperation(new EntryPendingOperation { OpType = EntryOpType.Add, EntryId = local.Id, Entry = local, CreatedAt = DateTime.UtcNow });
        UpsertLocalCache(local);
        return true;
    }

    public async Task<bool> EditAsync(MesXslRawMaterialEntry entry, CancellationToken ct = default)
    {
        if (!entry.TenantId.HasValue || entry.TenantId.Value <= 0) entry.TenantId = DefaultTenantId;
        var local = Clone(entry);

        if (_networkMonitor.IsOnline)
        {
            try
            {
                var (ok, _) = await RemoteEditAsync(local, ct).ConfigureAwait(false);
                if (ok) { UpsertLocalCache(local); return true; }
                return false;
            }
            catch (Exception ex)
            {
                _logger.Warning($"[原料入场修改] 远端失败，转离线 id={local.Id}：{ex.Message}");
            }
        }

        EnqueuePendingOperation(new EntryPendingOperation { OpType = EntryOpType.Edit, EntryId = local.Id, Entry = local, AnchorUpdateTime = local.UpdateTime, CreatedAt = DateTime.UtcNow });
        UpsertLocalCache(local);
        return true;
    }

    public async Task<bool> DeleteAsync(string id, CancellationToken ct = default)
    {
        if (_networkMonitor.IsOnline)
        {
            try
            {
                var ok = await RemoteDeleteAsync(id, ct).ConfigureAwait(false);
                if (ok) { RemoveFromLocalCache(id); return true; }
                return false;
            }
            catch (Exception ex)
            {
                _logger.Warning($"[原料入场删除] 远端失败，转离线 id={id}：{ex.Message}");
            }
        }

        DateTime? anchor;
        lock (_cacheLock) { anchor = _localCache.FirstOrDefault(e => string.Equals(e.Id, id, StringComparison.OrdinalIgnoreCase))?.UpdateTime; }
        EnqueuePendingOperation(new EntryPendingOperation { OpType = EntryOpType.Delete, EntryId = id, AnchorUpdateTime = anchor, CreatedAt = DateTime.UtcNow });
        RemoveFromLocalCache(id);
        return true;
    }

    public async Task<bool> DeleteBatchAsync(string ids, CancellationToken ct = default)
    {
        var idList = ids.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        var allSuccess = true;
        foreach (var id in idList) allSuccess &= await DeleteAsync(id, ct).ConfigureAwait(false);
        return allSuccess;
    }

    public async Task<string?> GenerateBarcodeAsync(string materialCode, CancellationToken ct = default)
    {
        var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/generateBarcode?materialCode={Uri.EscapeDataString(materialCode ?? "")}";
        try
        {
            using var client = CreateClient();
            var resp = await client.GetAsync(url, ct).ConfigureAwait(false);
            resp.EnsureSuccessStatusCode();
            var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
            using var doc = JsonDocument.Parse(json);
            if (doc.RootElement.TryGetProperty("result", out var el))
                return el.GetString();
        }
        catch (Exception ex)
        {
            _logger.Warning($"[原料入场] 生成条码失败: {ex.Message}");
        }
        return null;
    }

    // ─── Remote ────────────────────────────────────────────────────────────────

    private async Task<List<MesXslRawMaterialEntry>> FetchRemoteListAsync(CancellationToken ct)
    {
        var query = HttpUtility.ParseQueryString(string.Empty);
        query["pageNo"] = "1";
        query["pageSize"] = "10000";
        query["tenantId"] = DefaultTenantId.ToString();
        var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/list?{query}";
        using var client = CreateClient();
        var resp = await client.GetAsync(url, ct).ConfigureAwait(false);
        resp.EnsureSuccessStatusCode();
        var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
        using var doc = JsonDocument.Parse(json);
        var result = doc.RootElement.GetProperty("result");
        return result.GetProperty("records").Deserialize<List<MesXslRawMaterialEntry>>(_jsonOpts) ?? new();
    }

    private async Task<bool> RemoteAddAsync(MesXslRawMaterialEntry entry, CancellationToken ct)
    {
        var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/add?tenantId={DefaultTenantId}";
        var payload = Clone(entry);
        if (IsLocalTempId(payload.Id)) payload.Id = null;
        return await PostJsonAsync(url, payload, ct).ConfigureAwait(false);
    }

    private async Task<(bool Ok, bool IsVersionConflict)> RemoteEditAsync(MesXslRawMaterialEntry entry, CancellationToken ct)
    {
        var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/edit?tenantId={DefaultTenantId}";
        return await PostJsonCheckVersionAsync(url, entry, ct).ConfigureAwait(false);
    }

    private async Task<bool> RemoteDeleteAsync(string id, CancellationToken ct)
    {
        var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/delete?id={Uri.EscapeDataString(id)}&tenantId={DefaultTenantId}";
        using var client = CreateClient();
        var resp = await client.DeleteAsync(url, ct).ConfigureAwait(false);
        return resp.IsSuccessStatusCode && await IsSuccessResultAsync(resp, ct).ConfigureAwait(false);
    }

    private async Task<bool> PostJsonAsync(string url, object body, CancellationToken ct)
    {
        var content = new StringContent(JsonSerializer.Serialize(body, _jsonOpts), Encoding.UTF8, "application/json");
        using var client = CreateClient();
        var resp = await client.PostAsync(url, content, ct).ConfigureAwait(false);
        return resp.IsSuccessStatusCode && await IsSuccessResultAsync(resp, ct).ConfigureAwait(false);
    }

    private async Task<(bool Ok, bool IsVersionConflict)> PostJsonCheckVersionAsync(string url, object body, CancellationToken ct)
    {
        var content = new StringContent(JsonSerializer.Serialize(body, _jsonOpts), Encoding.UTF8, "application/json");
        using var client = CreateClient();
        var resp = await client.PostAsync(url, content, ct).ConfigureAwait(false);
        if (!resp.IsSuccessStatusCode) return (false, false);
        try
        {
            var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
            using var doc = JsonDocument.Parse(json);
            int code = 200;
            if (doc.RootElement.TryGetProperty("code", out var codeEl)) code = codeEl.GetInt32();
            if (code == 200) return (true, false);
            if (doc.RootElement.TryGetProperty("message", out var msgEl))
                if ((msgEl.GetString() ?? "").Contains("已被他人修改")) return (false, true);
            return (false, false);
        }
        catch { return (true, false); }
    }

    private static async Task<bool> IsSuccessResultAsync(HttpResponseMessage resp, CancellationToken ct)
    {
        try
        {
            var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
            using var doc = JsonDocument.Parse(json);
            if (doc.RootElement.TryGetProperty("code", out var code)) return code.GetInt32() == 200;
            if (doc.RootElement.TryGetProperty("success", out var success)) return success.GetBoolean();
            return true;
        }
        catch { return true; }
    }

    // ─── Network / Reconnect ───────────────────────────────────────────────────

    private void OnNetworkStatusChanged(bool isOnline)
    {
        if (!isOnline) return;
        _ = Task.Run(() => SyncAfterReconnectAsync(CancellationToken.None));
    }

    private async Task SyncAfterReconnectAsync(CancellationToken cancellationToken)
    {
        var pushResult = await PushPendingOnReconnectAsync(cancellationToken).ConfigureAwait(false);
        if (!_networkMonitor.IsOnline) return;
        try
        {
            var remote = await FetchRemoteListAsync(cancellationToken).ConfigureAwait(false);
            lock (_cacheLock) { _localCache = remote.Select(Clone).ToList(); SaveCacheToDiskUnsafe(); }
            _eventAggregator.GetEvent<RawMaterialEntryChangedEvent>().Publish(new RawMaterialEntryChangedPayload { Action = "pull" });
            _logger.Information($"[原料入场重连] 全量回拉成功 count={remote.Count}");
        }
        catch (Exception ex) { _logger.Warning($"[原料入场重连] 全量回拉失败：{ex.Message}"); }

        if (pushResult.PushedCount > 0 || pushResult.ConflictCount > 0 || pushResult.NewRecordsPushed > 0)
        {
            _eventAggregator.GetEvent<SyncConflictEvent>().Publish(new SyncConflictPayload
            {
                EntityName = "原料入场",
                PushedCount = pushResult.PushedCount,
                ConflictCount = pushResult.ConflictCount,
                NewRecordsPushed = pushResult.NewRecordsPushed
            });
        }
    }

    private sealed record PendingReplayResult(bool Ok, bool IsConflict, string? EntityId);

    private async Task<PushPendingResult> PushPendingOnReconnectAsync(CancellationToken cancellationToken)
    {
        if (!await _syncLock.WaitAsync(0, cancellationToken).ConfigureAwait(false))
            return new PushPendingResult(0, 0, 0);
        try
        {
            List<EntryPendingOperation> snapshot;
            lock (_cacheLock) { snapshot = _pendingOps.OrderBy(x => x.CreatedAt).ToList(); }

            int pushed = 0, conflicts = 0, newPushed = 0;
            foreach (var op in snapshot)
            {
                if (!_networkMonitor.IsOnline) break;
                lock (_cacheLock) { if (!_pendingOps.Any(x => x.Id == op.Id)) continue; }

                var result = await ExecutePendingOperationAsync(op, cancellationToken).ConfigureAwait(false);
                if (!result.Ok)
                {
                    lock (_cacheLock)
                    {
                        op.RetryCount++;
                        if (op.RetryCount >= MaxPendingRetries) _pendingOps.RemoveAll(x => x.Id == op.Id);
                        SavePendingOpsToDiskUnsafe();
                    }
                    break;
                }
                if (result.IsConflict)
                {
                    conflicts++;
                    if (!string.IsNullOrWhiteSpace(result.EntityId)) RemovePendingOpsByEntryId(result.EntityId!);
                    continue;
                }
                lock (_cacheLock)
                {
                    if (op.OpType == EntryOpType.Add) newPushed++; else pushed++;
                    _pendingOps.RemoveAll(x => x.Id == op.Id);
                    SavePendingOpsToDiskUnsafe();
                }
            }
            return new PushPendingResult(pushed, conflicts, newPushed);
        }
        finally { _syncLock.Release(); }
    }

    private async Task<PendingReplayResult> ExecutePendingOperationAsync(EntryPendingOperation op, CancellationToken ct)
    {
        try
        {
            switch (op.OpType)
            {
                case EntryOpType.Add:
                    var ok = op.Entry != null && await RemoteAddAsync(op.Entry, ct).ConfigureAwait(false);
                    return ok ? new PendingReplayResult(true, false, op.EntryId) : new PendingReplayResult(false, false, null);

                case EntryOpType.Edit:
                    if (op.Entry == null || string.IsNullOrWhiteSpace(op.Entry.Id))
                        return new PendingReplayResult(false, false, null);
                    var id = op.Entry.Id;
                    var remote = await FetchRemoteSingleAsync(id, ct).ConfigureAwait(false);
                    if (remote != null && op.AnchorUpdateTime != null && remote.UpdateTime != op.AnchorUpdateTime)
                    {
                        UpsertLocalCache(remote);
                        return new PendingReplayResult(true, true, id);
                    }
                    var (editOk, isConflict) = await RemoteEditAsync(op.Entry, ct).ConfigureAwait(false);
                    if (isConflict) { var fresh = await FetchRemoteSingleAsync(id, ct).ConfigureAwait(false); if (fresh != null) UpsertLocalCache(fresh); return new PendingReplayResult(true, true, id); }
                    return editOk ? new PendingReplayResult(true, false, id) : new PendingReplayResult(false, false, null);

                case EntryOpType.Delete:
                    if (string.IsNullOrWhiteSpace(op.EntryId)) return new PendingReplayResult(false, false, null);
                    var delId = op.EntryId!;
                    var delRemote = await FetchRemoteSingleAsync(delId, ct).ConfigureAwait(false);
                    if (delRemote == null) return new PendingReplayResult(true, false, delId);
                    if (op.AnchorUpdateTime != null && delRemote.UpdateTime != op.AnchorUpdateTime) { UpsertLocalCache(delRemote); return new PendingReplayResult(true, true, delId); }
                    var delOk = await RemoteDeleteAsync(delId, ct).ConfigureAwait(false);
                    return delOk ? new PendingReplayResult(true, false, delId) : new PendingReplayResult(false, false, null);

                default:
                    return new PendingReplayResult(true, false, null);
            }
        }
        catch (Exception ex)
        {
            _logger.Warning($"[原料入场推送] 执行异常 op={op.OpType}，entryId={op.EntryId}：{ex.Message}");
            return new PendingReplayResult(false, false, null);
        }
    }

    private async Task<MesXslRawMaterialEntry?> FetchRemoteSingleAsync(string id, CancellationToken ct)
    {
        try
        {
            var url = $"{BaseUrl}/xslmes/mesXslRawMaterialEntry/anon/queryById?id={Uri.EscapeDataString(id)}&tenantId={DefaultTenantId}";
            using var client = CreateClient();
            var resp = await client.GetAsync(url, ct).ConfigureAwait(false);
            if (!resp.IsSuccessStatusCode) return null;
            var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
            using var doc = JsonDocument.Parse(json);
            if (doc.RootElement.TryGetProperty("result", out var resultEl))
                return resultEl.Deserialize<MesXslRawMaterialEntry>(_jsonOpts);
            return null;
        }
        catch { return null; }
    }

    // ─── Local cache helpers ───────────────────────────────────────────────────

    private static List<MesXslRawMaterialEntry> ApplyFilters(
        List<MesXslRawMaterialEntry> source,
        string? barcode, string? batchNo, string? billNo,
        string? materialName, string? supplierName)
    {
        IEnumerable<MesXslRawMaterialEntry> q = source;
        if (!string.IsNullOrWhiteSpace(barcode))
            q = q.Where(e => (e.Barcode ?? "").Contains(barcode, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(batchNo))
            q = q.Where(e => (e.BatchNo ?? "").Contains(batchNo, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(billNo))
            q = q.Where(e => (e.BillNo ?? "").Contains(billNo, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(materialName))
            q = q.Where(e => (e.MaterialName ?? "").Contains(materialName, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(supplierName))
            q = q.Where(e => (e.SupplierName ?? "").Contains(supplierName, StringComparison.OrdinalIgnoreCase));
        return q.OrderByDescending(e => e.EntryTime ?? e.CreateTime ?? DateTime.MinValue).ToList();
    }

    private List<MesXslRawMaterialEntry> ApplyPendingOpsSnapshotUnsafe(List<MesXslRawMaterialEntry> source)
    {
        var map = source.Where(e => !string.IsNullOrWhiteSpace(e.Id))
            .ToDictionary(e => e.Id!, Clone, StringComparer.OrdinalIgnoreCase);

        foreach (var op in _pendingOps.OrderBy(x => x.CreatedAt))
        {
            switch (op.OpType)
            {
                case EntryOpType.Add:
                case EntryOpType.Edit:
                    if (op.Entry != null && !string.IsNullOrWhiteSpace(op.Entry.Id))
                        map[op.Entry.Id] = Clone(op.Entry);
                    break;
                case EntryOpType.Delete:
                    if (!string.IsNullOrWhiteSpace(op.EntryId))
                        map.Remove(op.EntryId);
                    break;
            }
        }
        return map.Values.ToList();
    }

    private void EnqueuePendingOperation(EntryPendingOperation op)
    {
        lock (_cacheLock) { _pendingOps.Add(op); SavePendingOpsToDiskUnsafe(); }
    }

    private void UpsertLocalCache(MesXslRawMaterialEntry entry)
    {
        lock (_cacheLock)
        {
            var idx = _localCache.FindIndex(e => string.Equals(e.Id, entry.Id, StringComparison.OrdinalIgnoreCase));
            if (idx >= 0) _localCache[idx] = Clone(entry);
            else _localCache.Insert(0, Clone(entry));
            SaveCacheToDiskUnsafe();
        }
    }

    private void RemoveFromLocalCache(string id)
    {
        lock (_cacheLock) { _localCache.RemoveAll(e => string.Equals(e.Id, id, StringComparison.OrdinalIgnoreCase)); SaveCacheToDiskUnsafe(); }
    }

    private void RemovePendingOpsByEntryId(string entryId)
    {
        lock (_cacheLock)
        {
            _pendingOps.RemoveAll(x =>
                (!string.IsNullOrWhiteSpace(x.EntryId) && string.Equals(x.EntryId, entryId, StringComparison.OrdinalIgnoreCase)) ||
                (x.Entry?.Id != null && string.Equals(x.Entry.Id, entryId, StringComparison.OrdinalIgnoreCase)));
            SavePendingOpsToDiskUnsafe();
        }
    }

    private void LoadPendingOpsFromDisk()
    {
        try
        {
            if (!File.Exists(_pendingOpsFilePath)) return;
            var data = JsonSerializer.Deserialize<List<EntryPendingOperation>>(File.ReadAllText(_pendingOpsFilePath), _jsonOpts);
            _pendingOps = data ?? new();
        }
        catch { _pendingOps = new(); }
    }

    private void LoadCacheFromDisk()
    {
        try
        {
            if (!File.Exists(_cacheFilePath)) return;
            var data = JsonSerializer.Deserialize<List<MesXslRawMaterialEntry>>(File.ReadAllText(_cacheFilePath), _jsonOpts);
            _localCache = data ?? new();
        }
        catch { _localCache = new(); }
    }

    private void SavePendingOpsToDiskUnsafe() =>
        File.WriteAllText(_pendingOpsFilePath, JsonSerializer.Serialize(_pendingOps, _jsonOpts));

    private void SaveCacheToDiskUnsafe() =>
        File.WriteAllText(_cacheFilePath, JsonSerializer.Serialize(_localCache, _jsonOpts));

    private static MesXslRawMaterialEntry Clone(MesXslRawMaterialEntry e) => new()
    {
        Id = e.Id, Barcode = e.Barcode, BatchNo = e.BatchNo, EntryTime = e.EntryTime,
        WeightRecordId = e.WeightRecordId, BillNo = e.BillNo, MaterialId = e.MaterialId,
        MaterialName = e.MaterialName, SupplyCustomer = e.SupplyCustomer, SupplierId = e.SupplierId,
        SupplierName = e.SupplierName, ManufacturerMaterialName = e.ManufacturerMaterialName,
        ShelfLife = e.ShelfLife, TotalWeight = e.TotalWeight, TotalPortions = e.TotalPortions,
        PortionWeight = e.PortionWeight, PortionPackages = e.PortionPackages,
        TestResult = e.TestResult, TestStatus = e.TestStatus, PrintFlag = e.PrintFlag,
        StockBalance = e.StockBalance, WarehouseLocation = e.WarehouseLocation,
        UnloadOperator = e.UnloadOperator, IsSpecialAdoption = e.IsSpecialAdoption,
        SpecialAdoptionOperator = e.SpecialAdoptionOperator, SpecialAdoptionTime = e.SpecialAdoptionTime,
        SpecialAdoptionReason = e.SpecialAdoptionReason, Status = e.Status, Remark = e.Remark,
        CreateBy = e.CreateBy, CreateTime = e.CreateTime, UpdateBy = e.UpdateBy,
        UpdateTime = e.UpdateTime, TenantId = e.TenantId
    };

    private static bool IsLocalTempId(string? id) =>
        !string.IsNullOrWhiteSpace(id) && id.StartsWith("local-", StringComparison.OrdinalIgnoreCase);

    private sealed class EntryPendingOperation
    {
        public string Id { get; set; } = Guid.NewGuid().ToString("N");
        public EntryOpType OpType { get; set; }
        public string? EntryId { get; set; }
        public MesXslRawMaterialEntry? Entry { get; set; }
        public DateTime? AnchorUpdateTime { get; set; }
        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
        public int RetryCount { get; set; } = 0;
    }

    private enum EntryOpType { Add = 1, Edit = 2, Delete = 3 }

    private sealed class NullableDateTimeJsonConverter : JsonConverter<DateTime?>
    {
        private static readonly string[] SupportedFormats =
        [
            "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm:ss.fff",
            "yyyy-MM-ddTHH:mm:ss", "yyyy-MM-ddTHH:mm:ss.fff",
            "yyyy-MM-ddTHH:mm:ssZ", "yyyy-MM-ddTHH:mm:ss.fffZ"
        ];

        public override DateTime? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.Null) return null;
            if (reader.TokenType == JsonTokenType.String)
            {
                var raw = reader.GetString();
                if (string.IsNullOrWhiteSpace(raw)) return null;
                if (DateTime.TryParseExact(raw, SupportedFormats, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AssumeLocal, out var exact)) return exact;
                if (DateTime.TryParse(raw, out var fallback)) return fallback;
            }
            throw new JsonException($"无法将 JSON 值转换为 DateTime?，token={reader.TokenType}");
        }

        public override void Write(Utf8JsonWriter writer, DateTime? value, JsonSerializerOptions options)
        {
            if (value.HasValue) writer.WriteStringValue(value.Value.ToString("yyyy-MM-dd HH:mm:ss"));
            else writer.WriteNullValue();
        }
    }
}