using System.Security.Cryptography;
using System.Text.Json;
using Admin.NET.Plugin.AiDOP.DataPlatform.Executors;
using Admin.NET.Plugin.AiDOP.Entity.DataPlatform;
using Microsoft.AspNetCore.Http;
using MiniExcelLibs;

namespace Admin.NET.Plugin.AiDOP.DataPlatform.FileImport;

public sealed class MdpExcelImportService : ITransient
{
    private readonly ISqlSugarClient _db;
    private readonly UserManager _userManager;
    private readonly MdpStagingWriter _writer;
    private readonly MdpExcelTemplateService _template;
    private readonly IEnumerable<IMdpFileImportConsumer> _consumers;

    public MdpExcelImportService(
        ISqlSugarClient db,
        UserManager userManager,
        MdpStagingWriter writer,
        MdpExcelTemplateService template,
        IEnumerable<IMdpFileImportConsumer> consumers)
    {
        _db = db;
        _userManager = userManager;
        _writer = writer;
        _template = template;
        _consumers = consumers;
    }

    private long TenantId => AidopTenantScope.ResolveOrThrow(_userManager);

    public async Task<object> ListEntitiesAsync(CancellationToken ct)
    {
        var tenantId = TenantId;
        var sources = await _db.Queryable<MdpSource>()
            .Where(s => s.SourceType == "FILE_EXCEL" && s.Status == 1)
            .ToListAsync(ct);
        var sourceIds = sources.Select(s => s.Id).ToList();
        var entities = await _db.Queryable<MdpEntity>()
            .Where(e => sourceIds.Contains(e.SourceId) && e.Status == 1 && (e.TenantId == tenantId || e.IsPublicTemplate == 1))
            .ToListAsync(ct);
        return new
        {
            list = entities.Select(e =>
            {
                var s = sources.First(x => x.Id == e.SourceId);
                return new
                {
                    e.Id,
                    e.EntityCode,
                    e.EntityName,
                    s.SourceCode,
                    e.TargetTableName,
                    e.BizKeyExpr,
                    e.IsPublicTemplate
                };
            })
        };
    }

    public async Task<IActionResult> TemplateAsync(string entityCode, CancellationToken ct)
    {
        var (entity, _, mappings) = await LoadEntityAsync(entityCode, ct);
        return await _template.BuildAsync(entity, mappings);
    }

    public async Task<object> ValidateAsync(IFormFile file, string entityCode, long factoryId, CancellationToken ct)
    {
        var tenantId = TenantId;
        var (entity, source, mappings) = await LoadEntityAsync(entityCode, ct);
        if (file == null || file.Length == 0)
            throw Oops.Oh("请上传 Excel 文件");
        await using var stream = file.OpenReadStream();
        MdpFileImportSecurity.EnsureXlsx(file.FileName, file.Length, stream);
        var sha = await ShaAsync(stream, ct);
        stream.Position = 0;
        var dup = await _db.Queryable<MdpFileImportBatch>()
            .Where(x => x.TenantId == tenantId && x.FileSha256 == sha && x.Status == "SUCCESS")
            .CountAsync(ct);
        if (dup > 0)
            throw Oops.Oh("相同文件已成功导入");

        var sheet = MdpExcelTemplateService.ReadSheet(entity);
        var rows = MiniExcel.Query(stream, useHeaderRow: true, sheetName: sheet).Cast<IDictionary<string, object>>().ToList();
        if (rows.Count > MdpFileImportSecurity.MaxRows)
            throw Oops.Oh($"超过最大行数 {MdpFileImportSecurity.MaxRows}");

        var now = DateTime.Now;
        var batch = new MdpFileImportBatch
        {
            BatchNo = $"MDP_FILE_{now:yyyyMMddHHmmss}_{Random.Shared.Next(1000, 9999)}",
            TenantId = tenantId,
            FactoryId = factoryId,
            SourceId = source.Id,
            EntityId = entity.Id,
            EntityCode = entity.EntityCode,
            FileName = file.FileName,
            FileSha256 = sha,
            FileSize = file.Length,
            SheetName = sheet,
            ImportMode = "UPSERT",
            Status = "VALIDATING",
            CreatedBy = _userManager.RealName ?? _userManager.Account,
            CreateTime = now
        };
        batch.Id = await _db.Insertable(batch).ExecuteReturnIdentityAsync();

        var errors = new List<MdpFileImportError>();
        var hashes = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        var valid = 0;
        for (var i = 0; i < rows.Count; i++)
        {
            var rowNo = i + 2;
            try
            {
                var raw = rows[i].ToDictionary(x => StripStar(x.Key), x => x.Value, StringComparer.OrdinalIgnoreCase);
                MdpFileImportSecurity.StripClientTenant(raw!);
                var mapped = MdpExcelValidation.MapRow(raw!, mappings);
                mapped["factory_id"] = factoryId;
                var biz = MdpExcelValidation.BusinessKey(entity.BizKeyExpr, mapped);
                var hash = MdpExcelValidation.RowHash(mapped);
                var writeStatus = hashes.Add(hash) ? "PENDING" : "DUPLICATE";
                if (writeStatus == "DUPLICATE")
                    errors.Add(Err(batch.Id, rowNo, "ROW_HASH", "DUPLICATE_HASH", "相同内容重复"));
                else
                    valid++;
                await _db.Insertable(new MdpFileImportRow
                {
                    BatchId = batch.Id,
                    RowNo = rowNo,
                    BusinessKey = biz,
                    RowHash = hash,
                    RawJson = JsonSerializer.Serialize(raw),
                    MappedJson = JsonSerializer.Serialize(mapped),
                    ValidationStatus = writeStatus == "PENDING" ? "OK" : "ERROR",
                    WriteStatus = writeStatus,
                    ErrorCount = writeStatus == "PENDING" ? 0 : 1
                }).ExecuteCommandAsync();
            }
            catch (Exception ex)
            {
                errors.Add(Err(batch.Id, rowNo, null, "ROW_INVALID", ex.Message));
                await _db.Insertable(new MdpFileImportRow
                {
                    BatchId = batch.Id,
                    RowNo = rowNo,
                    ValidationStatus = "ERROR",
                    WriteStatus = "REJECTED",
                    ErrorCount = 1,
                    RawJson = JsonSerializer.Serialize(rows[i])
                }).ExecuteCommandAsync();
            }
        }

        if (errors.Count > 0)
            await _db.Insertable(errors).ExecuteCommandAsync();

        batch.TotalRows = rows.Count;
        batch.ValidRows = valid;
        batch.ErrorRows = errors.Count;
        batch.Status = errors.Count == 0 && valid > 0 ? "READY" : "VALIDATION_FAILED";
        await _db.Updateable(batch).ExecuteCommandAsync();
        return new { batchNo = batch.BatchNo, batch.Status, batch.TotalRows, batch.ValidRows, batch.ErrorRows };
    }

    public async Task<object> GetAsync(string batchNo, CancellationToken ct)
    {
        var tenantId = TenantId;
        var batch = await _db.Queryable<MdpFileImportBatch>().FirstAsync(x => x.TenantId == tenantId && x.BatchNo == batchNo, ct)
            ?? throw Oops.Oh("批次不存在");
        return batch;
    }

    public async Task<IActionResult> ErrorsAsync(string batchNo, CancellationToken ct)
    {
        var tenantId = TenantId;
        var batch = await _db.Queryable<MdpFileImportBatch>().FirstAsync(x => x.TenantId == tenantId && x.BatchNo == batchNo, ct)
            ?? throw Oops.Oh("批次不存在");
        var errors = await _db.Queryable<MdpFileImportError>().Where(x => x.BatchId == batch.Id).ToListAsync(ct);
        var memory = new MemoryStream();
        await memory.SaveAsAsync(errors, sheetName: "错误");
        memory.Seek(0, SeekOrigin.Begin);
        return new FileStreamResult(memory, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
        {
            FileDownloadName = $"{batch.BatchNo}-errors.xlsx"
        };
    }

    public async Task<object> CommitAsync(string batchNo, CancellationToken ct)
    {
        var tenantId = TenantId;
        var batch = await _db.Queryable<MdpFileImportBatch>().FirstAsync(x => x.TenantId == tenantId && x.BatchNo == batchNo, ct)
            ?? throw Oops.Oh("批次不存在");
        if (batch.Status == "SUCCESS")
            throw Oops.Oh("该批次已导入");
        if (batch.Status != "READY")
            throw Oops.Oh("只有预检通过的批次可以确认导入");

        var (entity, source, _) = await LoadEntityAsync(batch.EntityCode, ct);
        if (string.IsNullOrWhiteSpace(entity.TargetTableName) || !System.Text.RegularExpressions.Regex.IsMatch(entity.TargetTableName, @"^[A-Za-z0-9_]+$"))
            throw Oops.Oh("实体目标表非法");

        batch.Status = "IMPORTING";
        await _db.Updateable(batch).UpdateColumns(x => new { x.Status }).ExecuteCommandAsync();

        var rows = await _db.Queryable<MdpFileImportRow>()
            .Where(x => x.BatchId == batch.Id && x.ValidationStatus == "OK")
            .ToListAsync(ct);
        var ctx = new MdpPullContext { TenantId = tenantId, BatchId = batch.BatchNo };
        var written = 0;
        foreach (var row in rows)
        {
            var mapped = JsonSerializer.Deserialize<Dictionary<string, object?>>(row.MappedJson ?? "{}")
                         ?? new Dictionary<string, object?>();
            MdpFileImportSecurity.StripClientTenant(mapped);
            mapped["factory_id"] = batch.FactoryId;
            var n = await _writer.UpsertAsync(
                source, entity, entity.EntityCode, mapped, row.RawJson ?? "{}",
                $"{batch.BatchNo}:{row.RowNo}", ctx);
            written += n;
            row.WriteStatus = n > 0 ? "WRITTEN" : "SKIPPED";
            await _db.Updateable(row).UpdateColumns(x => new { x.WriteStatus }).ExecuteCommandAsync();
        }

        var consumer = _consumers.FirstOrDefault(c => c.CanConsume(entity.EntityCode));
        if (consumer != null)
        {
            await consumer.ConsumeAsync(entity.EntityCode, tenantId, batch.FactoryId, batch.BatchNo, ct);
            batch.TransformStatus = "SUCCESS";
            batch.TransformTime = DateTime.Now;
        }

        batch.WrittenRows = written;
        batch.Status = "SUCCESS";
        batch.CommitTime = DateTime.Now;
        await _db.Updateable(batch).ExecuteCommandAsync();
        return new { batch.BatchNo, batch.Status, batch.WrittenRows, batch.TransformStatus };
    }

    public async Task<object> VoidAsync(string batchNo, CancellationToken ct)
    {
        var tenantId = TenantId;
        var batch = await _db.Queryable<MdpFileImportBatch>().FirstAsync(x => x.TenantId == tenantId && x.BatchNo == batchNo, ct)
            ?? throw Oops.Oh("批次不存在");
        if (batch.Status is "SUCCESS" or "IMPORTING")
            throw Oops.Oh("已提交批次请使用回滚");
        batch.Status = "VOIDED";
        await _db.Updateable(batch).UpdateColumns(x => new { x.Status }).ExecuteCommandAsync();
        return new { ok = true };
    }

    public async Task<object> RollbackAsync(string batchNo, CancellationToken ct)
    {
        var tenantId = TenantId;
        var batch = await _db.Queryable<MdpFileImportBatch>().FirstAsync(x => x.TenantId == tenantId && x.BatchNo == batchNo, ct)
            ?? throw Oops.Oh("批次不存在");
        if (batch.Status != "SUCCESS")
            throw Oops.Oh("仅成功批次可回滚");
        var entity = await _db.Queryable<MdpEntity>().FirstAsync(x => x.Id == batch.EntityId, ct)
            ?? throw Oops.Oh("实体不存在");
        var rebuildable = entity.FileConfigJson?.Contains("\"rebuildable\":true", StringComparison.OrdinalIgnoreCase) == true;
        if (!string.IsNullOrWhiteSpace(batch.TransformStatus) && batch.TransformStatus != "PENDING" && !rebuildable)
            throw Oops.Oh("已 Transform 且实体不可重建，请业务冲销");

        if (string.IsNullOrWhiteSpace(entity.TargetTableName) || !System.Text.RegularExpressions.Regex.IsMatch(entity.TargetTableName, @"^[A-Za-z0-9_]+$"))
            throw Oops.Oh("实体目标表非法");
        await _db.Ado.ExecuteCommandAsync(
            $"DELETE FROM `{entity.TargetTableName}` WHERE tenant_id=@TenantId AND sync_batch_id=@Batch",
            new SugarParameter("@TenantId", tenantId),
            new SugarParameter("@Batch", batch.BatchNo));
        batch.Status = "ROLLED_BACK";
        await _db.Updateable(batch).UpdateColumns(x => new { x.Status }).ExecuteCommandAsync();
        return new { ok = true };
    }

    private async Task<(MdpEntity entity, MdpSource source, List<MdpFieldMapping> mappings)> LoadEntityAsync(string entityCode, CancellationToken ct)
    {
        var tenantId = TenantId;
        var entity = await _db.Queryable<MdpEntity>()
            .Where(x => x.EntityCode == entityCode && x.Status == 1 && (x.TenantId == tenantId || x.IsPublicTemplate == 1))
            .FirstAsync(ct)
            ?? throw Oops.Oh("FILE 实体不存在或无权访问");
        var source = await _db.Queryable<MdpSource>().FirstAsync(x => x.Id == entity.SourceId, ct)
            ?? throw Oops.Oh("数据源不存在");
        if (!string.Equals(source.SourceType, "FILE_EXCEL", StringComparison.OrdinalIgnoreCase))
            throw Oops.Oh("该实体不是 FILE_EXCEL");
        var mappings = await _db.Queryable<MdpFieldMapping>().Where(x => x.EntityId == entity.Id).OrderBy(x => x.SortOrder).ToListAsync(ct);
        return (entity, source, mappings);
    }

    private static string StripStar(string name) => name.Replace(" ★", string.Empty).Trim();

    private static MdpFileImportError Err(long batchId, int rowNo, string? field, string code, string message) => new()
    {
        BatchId = batchId,
        RowNo = rowNo,
        FieldName = field,
        ErrorCode = code,
        ErrorMessage = message
    };

    private static async Task<string> ShaAsync(Stream stream, CancellationToken ct)
    {
        using var sha = SHA256.Create();
        var hash = await sha.ComputeHashAsync(stream, ct);
        return Convert.ToHexString(hash).ToLowerInvariant();
    }
}

public interface IMdpFileImportConsumer
{
    bool CanConsume(string entityCode);
    Task ConsumeAsync(string entityCode, long tenantId, long factoryId, string batchNo, CancellationToken ct);
}