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;
using YY.Admin.Core.Util;

namespace YY.Admin.Services.Service.WeightRecord;

public class WeightRecordService : IWeightRecordService, ISingletonDependency
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly IConfiguration _configuration;
    private readonly INetworkMonitor _networkMonitor;
    private readonly IEventAggregator _eventAggregator;
    private readonly ILoggerService _logger;
    // 用于按 BillNo 实时累计「已入场重量」，从本地入场记录缓存推导，
    // 与后端 IMesXslRawMaterialEntryService.sumEnteredWeightByBillNos 同一口径。
    private readonly IRawMaterialEntryService _rawMaterialEntryService;
    private readonly SemaphoreSlim _syncLock = new(1, 1);
    private readonly object _cacheLock = new();
    private readonly string _pendingOpsFilePath;
    private readonly string _cacheFilePath;
    private List<WeightRecordPendingOperation> _pendingOps = new();
    private List<MesXslWeightRecord> _localCache = new();

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

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

        var appDataDir = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
            "YY.Admin", "sync-cache");
        Directory.CreateDirectory(appDataDir);
        _pendingOpsFilePath = Path.Combine(appDataDir, "weight-record-pending-ops.json");
        _cacheFilePath = Path.Combine(appDataDir, "weight-record-cache.json");

        LoadPendingOpsFromDisk();
        LoadCacheFromDisk();
        _logger.Information($"[磅单同步] 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<WeightRecordPageResult> PageAsync(
        int pageNo, int pageSize,
        string? filterBillNo = null,
        string? filterPlateNumber = null,
        string? filterInoutDirection = null,
        string? filterDriverName = null,
        string? filterMixerMaterialName = null,
        CancellationToken ct = default)
    {
        List<MesXslWeightRecord>? source = null;
        if (_networkMonitor.IsOnline)
        {
            try
            {
                source = await FetchRemoteListAsync(ct).ConfigureAwait(false);
                lock (_cacheLock)
                {
                    _localCache = source.Select(Clone).ToList();
                    SaveCacheToDiskUnsafe();
                }
                _logger.Information($"[磅单列表] 远端拉取成功 count={source.Count}");
            }
            catch (Exception ex)
            {
                source = null;
                _logger.Warning($"[磅单列表] 远端拉取失败，回退本地缓存：{ex.Message}");
            }
        }

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

        var filtered = ApplyFilters(source, filterBillNo, filterPlateNumber, filterInoutDirection, filterDriverName, filterMixerMaterialName);
        var total = filtered.Count;
        var records = filtered.Skip(Math.Max(0, (pageNo - 1) * pageSize)).Take(pageSize).ToList();
        // 当前页结果按本地入场记录缓存，按 BillNo 实时累计「已入场重量」「货物皮重」（与后端口径一致）。
        FillEntryDerivedFieldsFromLocalEntries(records);
        return new WeightRecordPageResult(records, total, pageNo, pageSize);
    }

    /// <summary>
    /// 给一批磅单记录批量填充由原料入场记录衍生的 transient 字段。
    /// </summary>
    private void FillEntryDerivedFieldsFromLocalEntries(List<MesXslWeightRecord> records)
    {
        if (records.Count == 0)
        {
            return;
        }
        var billNos = records
            .Select(r => r.BillNo)
            .Where(s => !string.IsNullOrWhiteSpace(s))
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToList();
        if (billNos.Count == 0)
        {
            foreach (var r in records)
            {
                ApplyRawMaterialWeight(r);
            }
            return;
        }
        var entries = _rawMaterialEntryService.GetCachedSnapshot();
        var enteredMap = EnteredWeightCalculator.SumByBillNos(entries, billNos!);
        var cargoTareMap = CargoTareWeightCalculator.SumByBillNos(entries, billNos!);
        foreach (var r in records)
        {
            if (string.IsNullOrWhiteSpace(r.BillNo))
            {
                r.EnteredWeight = 0d;
                r.CargoTareWeight = 0d;
                ApplyRawMaterialWeight(r);
                continue;
            }
            r.EnteredWeight = enteredMap.TryGetValue(r.BillNo, out var entered) ? entered : 0d;
            r.CargoTareWeight = cargoTareMap.TryGetValue(r.BillNo, out var cargoTare) ? cargoTare : 0d;
            ApplyRawMaterialWeight(r);
        }
    }

    /// <summary>原料重量 = 净重 - 货物皮重（不落库）</summary>
    private static void ApplyRawMaterialWeight(MesXslWeightRecord record)
    {
        record.RawMaterialWeight = record.NetWeight.HasValue
            ? record.NetWeight.Value - (record.CargoTareWeight ?? 0d)
            : null;
    }

    public async Task<MesXslWeightRecord?> GetByIdAsync(string id, CancellationToken ct = default)
    {
        MesXslWeightRecord? record = null;
        if (_networkMonitor.IsOnline)
        {
            try
            {
                var url = $"{BaseUrl}/xslmes/mesXslWeightRecord/anon/queryById?id={Uri.EscapeDataString(id)}&tenantId={DefaultTenantId}";
                using var client = CreateClient();
                var resp = await client.GetAsync(url, ct).ConfigureAwait(false);
                if (resp.IsSuccessStatusCode)
                {
                    var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
                    using var doc = JsonDocument.Parse(json);
                    if (doc.RootElement.TryGetProperty("result", out var resultEl))
                    {
                        record = resultEl.Deserialize<MesXslWeightRecord>(_jsonOpts);
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.Warning($"[磅单详情] 远端查询异常 id={id}: {ex.Message}");
            }
        }

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

        if (record != null)
        {
            FillEntryDerivedFieldsFromLocalEntries(new List<MesXslWeightRecord> { record });
        }
        return record;
    }

    public async Task<bool> AddAsync(MesXslWeightRecord entity, CancellationToken ct = default)
    {
        SanitizeWeightsBeforePersist(entity);
        if (!entity.TenantId.HasValue || entity.TenantId.Value <= 0)
            entity.TenantId = DefaultTenantId;
        if (string.IsNullOrWhiteSpace(entity.BillNo))
            entity.BillNo = GenerateBillNo();
        entity.BillType = ResolveBillType(entity);

        var local = Clone(entity);
        if (string.IsNullOrWhiteSpace(local.Id))
            local.Id = $"local-{Guid.NewGuid():N}";

        if (_networkMonitor.IsOnline)
        {
            try
            {
                _logger.Information($"[磅单新增] 尝试远端新增 id={local.Id}");
                var ok = await RemoteAddAsync(local, ct).ConfigureAwait(false);
                if (ok) { UpsertLocalCache(local); return true; }
                _logger.Warning($"[磅单新增] 远端返回失败 id={local.Id}");
                return false;
            }
            catch (Exception ex)
            {
                _logger.Warning($"[磅单新增] 远端异常，转离线入队：{ex.Message}");
            }
        }

        EnqueuePendingOperation(new WeightRecordPendingOperation
        {
            OpType = WeightRecordOperationType.Add,
            WeightRecordId = local.Id,
            Entity = local
        });
        UpsertLocalCache(local);
        return true;
    }

    /// <summary>
    /// 按后端规则生成磅单号：BDH-yyyyMMddHHmmss + 3位随机数
    /// </summary>
    private static string GenerateBillNo()
    {
        var dateStr = DateTime.Now.ToString("yyyyMMddHHmmss");
        var seq = Random.Shared.Next(0, 1000).ToString("D3");
        return $"BDH-{dateStr}{seq}";
    }

    /// <summary>
    /// 根据称重数据推导单据类型：仅毛重=已称毛重；仅皮重=已称皮重；毛重+皮重=称重完成。
    /// 注意：皮重/毛重为 0 时按「未称」处理（避免 NumericUpDown/JSON 占位 0 误判为称重完成）。
    /// </summary>
    private static string? ResolveBillType(MesXslWeightRecord entity)
    {
        var g = HasEffectiveWeighKg(entity.GrossWeight);
        var t = HasEffectiveWeighKg(entity.TareWeight);
        if (g && t) return "2";
        if (g) return "1";
        if (t) return "3";
        return null;
    }

    private static bool HasEffectiveWeighKg(double? kg) => kg.HasValue && kg.Value > 0;

    /// <summary>
    /// 将 ≤0 的重量视为未录入并清空净重，防止上传 payload 带 0 误判。
    /// </summary>
    private static void SanitizeWeightsBeforePersist(MesXslWeightRecord entity)
    {
        if (entity.GrossWeight.HasValue && entity.GrossWeight.Value <= 0)
            entity.GrossWeight = null;
        if (entity.TareWeight.HasValue && entity.TareWeight.Value <= 0)
            entity.TareWeight = null;
        if (HasEffectiveWeighKg(entity.GrossWeight) && HasEffectiveWeighKg(entity.TareWeight))
            entity.NetWeight = Math.Round(entity.GrossWeight!.Value - entity.TareWeight!.Value, 2);
        else
            entity.NetWeight = null;
    }

    public async Task<bool> EditAsync(MesXslWeightRecord entity, CancellationToken ct = default)
    {
        SanitizeWeightsBeforePersist(entity);
        if (!entity.TenantId.HasValue || entity.TenantId.Value <= 0)
            entity.TenantId = DefaultTenantId;
        entity.BillType = ResolveBillType(entity);

        var local = Clone(entity);
        if (IsLocalTempId(local.Id))
        {
            // 本地临时ID表示该记录尚未上云：将“二次称重编辑”合并到同一条待上传新增，避免重连后产生冲突。
            if (TryMergeIntoPendingAdd(local))
            {
                UpsertLocalCache(local);
                return true;
            }

            // 兜底：若找不到待上传新增，则按新增入队，确保本地修改不丢失。
            EnqueuePendingOperation(new WeightRecordPendingOperation
            {
                OpType = WeightRecordOperationType.Add,
                WeightRecordId = local.Id,
                Entity = local
            });
            UpsertLocalCache(local);
            return true;
        }

        if (_networkMonitor.IsOnline)
        {
            try
            {
                _logger.Information($"[磅单修改] 尝试远端修改 id={local.Id}");
                var (ok, _) = await RemoteEditAsync(local, ct).ConfigureAwait(false);
                if (ok) { UpsertLocalCache(local); return true; }
                _logger.Warning($"[磅单修改] 远端返回失败 id={local.Id}");
                return false;
            }
            catch (Exception ex)
            {
                _logger.Warning($"[磅单修改] 远端异常，转离线入队：{ex.Message}");
            }
        }

        EnqueuePendingOperation(new WeightRecordPendingOperation
        {
            OpType = WeightRecordOperationType.Edit,
            WeightRecordId = local.Id,
            Entity = local,
            AnchorUpdateTime = local.UpdateTime
        });
        UpsertLocalCache(local);
        return true;
    }

    private bool TryMergeIntoPendingAdd(MesXslWeightRecord local)
    {
        if (string.IsNullOrWhiteSpace(local.Id)) return false;
        lock (_cacheLock)
        {
            var pendingAdd = _pendingOps
                .Where(x => x.OpType == WeightRecordOperationType.Add)
                .OrderByDescending(x => x.CreatedAt)
                .FirstOrDefault(x =>
                    string.Equals(x.WeightRecordId, local.Id, StringComparison.OrdinalIgnoreCase) ||
                    string.Equals(x.Entity?.Id, local.Id, StringComparison.OrdinalIgnoreCase));
            if (pendingAdd == null) return false;

            pendingAdd.Entity = Clone(local);
            pendingAdd.WeightRecordId = local.Id;
            SavePendingOpsToDiskUnsafe();
            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($"[磅单删除] 远端异常，转离线入队：{ex.Message}");
            }
        }

        DateTime? anchor;
        lock (_cacheLock)
            anchor = _localCache.FirstOrDefault(v => string.Equals(v.Id, id, StringComparison.OrdinalIgnoreCase))?.UpdateTime;

        EnqueuePendingOperation(new WeightRecordPendingOperation
        {
            OpType = WeightRecordOperationType.Delete,
            WeightRecordId = id,
            AnchorUpdateTime = anchor
        });
        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;
    }

    // ─────────────────── 远端 HTTP ───────────────────

    private async Task<List<MesXslWeightRecord>> FetchRemoteListAsync(CancellationToken ct)
    {
        var query = HttpUtility.ParseQueryString(string.Empty);
        query["pageNo"] = "1";
        query["pageSize"] = "10000";
        query["tenantId"] = DefaultTenantId.ToString();
        var url = $"{BaseUrl}/xslmes/mesXslWeightRecord/anon/list?{query}";
        using var client = CreateClient();
        _logger.Information($"[磅单远端] GET {url}");
        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<MesXslWeightRecord>>(_jsonOpts) ?? new();
    }

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

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

    private async Task<bool> RemoteDeleteAsync(string id, CancellationToken ct)
    {
        var url = $"{BaseUrl}/xslmes/mesXslWeightRecord/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) && (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; }
    }

    // ─────────────────── 重连同步 ───────────────────

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

    private async Task SyncAfterReconnectAsync(CancellationToken ct)
    {
        _logger.Information("[磅单重连] 开始重连同步");
        var pushResult = await PushPendingOnReconnectAsync(ct).ConfigureAwait(false);
        if (!_networkMonitor.IsOnline) return;
        try
        {
            var remote = await FetchRemoteListAsync(ct).ConfigureAwait(false);
            lock (_cacheLock) { _localCache = remote.Select(Clone).ToList(); SaveCacheToDiskUnsafe(); }
            _eventAggregator.GetEvent<MesXslWeightRecordChangedEvent>().Publish(new MesXslWeightRecordChangedPayload { Action = "pull" });
            _logger.Information($"[磅单重连] 全量回拉成功 count={remote.Count}");
        }
        catch (Exception ex) { _logger.Warning($"[磅单重连] 全量回拉失败：{ex.Message}"); }

        var hasActivity = pushResult.PushedCount > 0 || pushResult.ConflictCount > 0 || pushResult.NewRecordsPushed > 0;
        if (hasActivity)
            _eventAggregator.GetEvent<SyncConflictEvent>().Publish(new SyncConflictPayload
            {
                EntityName = "磅单",
                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 ct)
    {
        if (!await _syncLock.WaitAsync(0, ct).ConfigureAwait(false)) return new PushPendingResult(0, 0, 0);
        try
        {
            List<WeightRecordPendingOperation> snapshot;
            lock (_cacheLock) { snapshot = _pendingOps.OrderBy(x => x.CreatedAt).ToList(); }
            _logger.Information($"[磅单推送] 开始推送 pending={snapshot.Count}");

            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, ct).ConfigureAwait(false);
                if (!result.Ok)
                {
                    lock (_cacheLock)
                    {
                        op.RetryCount++;
                        if (op.RetryCount >= MaxPendingRetries)
                        {
                            _pendingOps.RemoveAll(x => x.Id == op.Id);
                            SavePendingOpsToDiskUnsafe();
                            continue;
                        }
                        SavePendingOpsToDiskUnsafe();
                    }
                    break;
                }
                if (result.IsConflict)
                {
                    conflicts++;
                    if (!string.IsNullOrWhiteSpace(result.EntityId)) RemovePendingOpsByEntityId(result.EntityId!);
                    continue;
                }
                lock (_cacheLock)
                {
                    if (op.OpType == WeightRecordOperationType.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(WeightRecordPendingOperation op, CancellationToken ct)
    {
        try
        {
            switch (op.OpType)
            {
                case WeightRecordOperationType.Add:
                {
                    var ok = op.Entity != null && await RemoteAddAsync(op.Entity, ct).ConfigureAwait(false);
                    return ok ? new PendingReplayResult(true, false, op.WeightRecordId) : new PendingReplayResult(false, false, null);
                }
                case WeightRecordOperationType.Edit:
                {
                    if (op.Entity?.Id == null) return new PendingReplayResult(false, false, null);
                    var remote = await GetByIdAsync(op.Entity.Id, ct).ConfigureAwait(false);
                    if (remote != null && op.AnchorUpdateTime != null && remote.UpdateTime != op.AnchorUpdateTime)
                    {
                        UpsertLocalCache(remote);
                        return new PendingReplayResult(true, true, op.Entity.Id);
                    }
                    var (ok, isConflict) = await RemoteEditAsync(op.Entity, ct).ConfigureAwait(false);
                    if (isConflict)
                    {
                        var fresh = await GetByIdAsync(op.Entity.Id, ct).ConfigureAwait(false);
                        if (fresh != null) UpsertLocalCache(fresh);
                        return new PendingReplayResult(true, true, op.Entity.Id);
                    }
                    return ok ? new PendingReplayResult(true, false, op.Entity.Id) : new PendingReplayResult(false, false, null);
                }
                case WeightRecordOperationType.Delete:
                {
                    if (string.IsNullOrWhiteSpace(op.WeightRecordId)) return new PendingReplayResult(false, false, null);
                    var id = op.WeightRecordId!;
                    var remote = await GetByIdAsync(id, ct).ConfigureAwait(false);
                    if (remote == null) return new PendingReplayResult(true, false, id);
                    if (op.AnchorUpdateTime != null && remote.UpdateTime != op.AnchorUpdateTime)
                    {
                        UpsertLocalCache(remote);
                        return new PendingReplayResult(true, true, id);
                    }
                    var ok = await RemoteDeleteAsync(id, ct).ConfigureAwait(false);
                    return ok ? new PendingReplayResult(true, false, id) : new PendingReplayResult(false, false, null);
                }
                default: return new PendingReplayResult(true, false, null);
            }
        }
        catch (Exception ex)
        {
            _logger.Warning($"[磅单推送] 执行异常 op={op.OpType}: {ex.Message}");
            return new PendingReplayResult(false, false, null);
        }
    }

    // ─────────────────── 过滤 / 缓存辅助 ───────────────────

    private static List<MesXslWeightRecord> ApplyFilters(
        List<MesXslWeightRecord> source,
        string? billNo, string? plateNumber, string? inoutDirection, string? driverName,
        string? mixerMaterialName = null)
    {
        IEnumerable<MesXslWeightRecord> q = source;
        if (!string.IsNullOrWhiteSpace(billNo))
            q = q.Where(v => (v.BillNo ?? "").Contains(billNo, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(plateNumber))
            q = q.Where(v => (v.PlateNumber ?? "").Contains(plateNumber, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(inoutDirection))
            q = q.Where(v => string.Equals(v.InoutDirection, inoutDirection, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(driverName))
            q = q.Where(v => (v.DriverName ?? "").Contains(driverName, StringComparison.OrdinalIgnoreCase));
        if (!string.IsNullOrWhiteSpace(mixerMaterialName))
            q = q.Where(v => (v.MixerMaterialNames ?? "").Contains(mixerMaterialName, StringComparison.OrdinalIgnoreCase));
        return q.OrderByDescending(v => v.CreateTime ?? DateTime.MinValue).ToList();
    }

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

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

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

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

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

    private void RemovePendingOpsByEntityId(string id)
    {
        lock (_cacheLock)
        {
            _pendingOps.RemoveAll(x =>
                (!string.IsNullOrWhiteSpace(x.WeightRecordId) && string.Equals(x.WeightRecordId, id, StringComparison.OrdinalIgnoreCase)) ||
                (x.Entity?.Id != null && string.Equals(x.Entity.Id, id, StringComparison.OrdinalIgnoreCase)));
            SavePendingOpsToDiskUnsafe();
        }
    }

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

    private void LoadCacheFromDisk()
    {
        try
        {
            if (!File.Exists(_cacheFilePath)) return;
            var data = JsonSerializer.Deserialize<List<MesXslWeightRecord>>(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 MesXslWeightRecord Clone(MesXslWeightRecord input) => new()
    {
        Id = input.Id,
        BillNo = input.BillNo,
        WeighDate = input.WeighDate,
        InoutDirection = input.InoutDirection,
        VehicleId = input.VehicleId,
        PlateNumber = input.PlateNumber,
        SenderUnit = input.SenderUnit,
        ReceiverUnit = input.ReceiverUnit,
        MixerMaterialIds = input.MixerMaterialIds,
        MixerMaterialNames = input.MixerMaterialNames,
        MaterialType = input.MaterialType,
        GrossWeight = input.GrossWeight,
        TareWeight = input.TareWeight,
        NetWeight = input.NetWeight,
        // transient 聚合字段：Clone 原样传递，避免本地缓存 / Pending 重放后被抹掉
        EnteredWeight = input.EnteredWeight,
        CargoTareWeight = input.CargoTareWeight,
        RawMaterialWeight = input.RawMaterialWeight,
        DriverName = input.DriverName,
        DriverPhone = input.DriverPhone,
        BillType = input.BillType,
        TenantId = input.TenantId,
        CreateBy = input.CreateBy,
        CreateTime = input.CreateTime,
        UpdateBy = input.UpdateBy,
        UpdateTime = input.UpdateTime,
        SysOrgCode = input.SysOrgCode,
        InoutDirectionText = input.InoutDirectionText,
        BillTypeText = input.BillTypeText,
        MaterialTypeText = input.MaterialTypeText
    };

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

    // ─────────────────── 内部数据结构 ───────────────────

    private sealed class WeightRecordPendingOperation
    {
        public string Id { get; set; } = Guid.NewGuid().ToString("N");
        public WeightRecordOperationType OpType { get; set; }
        public string? WeightRecordId { get; set; }
        public MesXslWeightRecord? Entity { get; set; }
        public DateTime? AnchorUpdateTime { get; set; }
        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
        public int RetryCount { get; set; } = 0;
    }

    private enum WeightRecordOperationType { 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",
            "yyyy-MM-dd"
        ];

        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"));
            else writer.WriteNullValue();
        }
    }
}