using Microsoft.Data.SqlClient;
using OrpaonVision.ConfigApp.Infrastructure.Persistence.Options;
using OrpaonVision.Core.Annotation;
using OrpaonVision.Core.Annotation.Contracts;
using OrpaonVision.Core.Abstractions;
using OrpaonVision.Core.Enums;
using OrpaonVision.Core.Results;
using OrpaonVision.Model.Annotation;

namespace OrpaonVision.ConfigApp.Infrastructure.Persistence;

/// <summary>
/// 标注任务仓储（SQL Server 最小实现）。
/// </summary>
public sealed class AnnotationTaskStore : IAnnotationTaskStore
{
    private readonly PersistenceOptions _options;
    private readonly IAppLogger _logger;

    /// <summary>
    /// 构造函数。
    /// </summary>
    public AnnotationTaskStore(PersistenceOptions options, IAppLogger logger)
    {
        _options = options;
        _logger = logger;
    }

    /// <inheritdoc />
    public Result SaveOrUpdate(AnnotationTaskDetailDto detail)
    {
        if (detail.CvatTaskId <= 0)
        {
            return Result.Fail("ANNOTATION_TASK_ID_INVALID", "CVAT 任务 ID 无效。", "必须大于 0。" );
        }

        try
        {
            using var connection = CreateOpenConnection();

            var model = new AnnotationTaskModel
            {
                TaskCode = $"CVAT-{detail.CvatTaskId}",
                TaskName = detail.TaskName,
                PlatformType = (int)AnnotationPlatformEnum.Cvat,
                ExternalTaskId = detail.CvatTaskId.ToString(),
                DatasetId = 0,
                LabelSetId = 0,
                Status = MapTaskStatus(detail.TaskStatus),
                ProgressPercent = null,
                SyncStatus = 2,
                CreatedAt = DateTime.Now,
                UpdatedAt = DateTime.Now,
                CreatedBy = "system",
                UpdatedBy = "system"
            };

            using var upsertCommand = connection.CreateCommand();
            upsertCommand.CommandText = @"
MERGE dbo.mdl_annotation_task AS target
USING (SELECT @external_task_id AS external_task_id) AS source
ON target.external_task_id = source.external_task_id
WHEN MATCHED THEN
    UPDATE SET
        task_name = @task_name,
        status = @status,
        sync_status = @sync_status,
        updated_at = @updated_at,
        updated_by = @updated_by,
        cvat_project_id = @cvat_project_id,
        item_count = @item_count,
        task_status_text = @task_status_text,
        updated_at_utc = @updated_at_utc
WHEN NOT MATCHED THEN
    INSERT
    (
        task_code, task_name, platform_type, external_task_id, dataset_id, label_set_id,
        status, sync_status, created_at, created_by, updated_at, updated_by,
        cvat_project_id, item_count, task_status_text, updated_at_utc
    )
    VALUES
    (
        @task_code, @task_name, @platform_type, @external_task_id, @dataset_id, @label_set_id,
        @status, @sync_status, @created_at, @created_by, @updated_at, @updated_by,
        @cvat_project_id, @item_count, @task_status_text, @updated_at_utc
    );";

            upsertCommand.Parameters.AddWithValue("@task_code", model.TaskCode);
            upsertCommand.Parameters.AddWithValue("@task_name", model.TaskName);
            upsertCommand.Parameters.AddWithValue("@platform_type", model.PlatformType);
            upsertCommand.Parameters.AddWithValue("@external_task_id", model.ExternalTaskId ?? (object)DBNull.Value);
            upsertCommand.Parameters.AddWithValue("@dataset_id", model.DatasetId);
            upsertCommand.Parameters.AddWithValue("@label_set_id", model.LabelSetId);
            upsertCommand.Parameters.AddWithValue("@status", model.Status);
            upsertCommand.Parameters.AddWithValue("@sync_status", model.SyncStatus);
            upsertCommand.Parameters.AddWithValue("@created_at", model.CreatedAt);
            upsertCommand.Parameters.AddWithValue("@created_by", model.CreatedBy ?? (object)DBNull.Value);
            upsertCommand.Parameters.AddWithValue("@updated_at", model.UpdatedAt ?? (object)DBNull.Value);
            upsertCommand.Parameters.AddWithValue("@updated_by", model.UpdatedBy ?? (object)DBNull.Value);
            upsertCommand.Parameters.AddWithValue("@cvat_project_id", detail.CvatProjectId ?? (object)DBNull.Value);
            upsertCommand.Parameters.AddWithValue("@item_count", detail.ItemCount);
            upsertCommand.Parameters.AddWithValue("@task_status_text", detail.TaskStatus);
            upsertCommand.Parameters.AddWithValue("@updated_at_utc", detail.UpdatedAtUtc ?? (object)DBNull.Value);

            upsertCommand.ExecuteNonQuery();
            return Result.Success("ANNOTATION_TASK_STORE_OK", "标注任务快照已保存。" );
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError("保存标注任务快照失败。", ex, traceId);
            return Result.FromException(ex, "ANNOTATION_TASK_STORE_FAILED", "保存标注任务快照失败。", traceId);
        }
    }

    /// <inheritdoc />
    public Result<AnnotationTaskDetailDto?> GetByCvatTaskId(long cvatTaskId)
    {
        if (cvatTaskId <= 0)
        {
            return Result<AnnotationTaskDetailDto?>.Fail("ANNOTATION_TASK_ID_INVALID", "CVAT 任务 ID 无效。", "必须大于 0。" );
        }

        try
        {
            using var connection = CreateOpenConnection();
            using var command = connection.CreateCommand();
            command.CommandText = @"
SELECT TOP(1)
    external_task_id,
    task_name,
    cvat_project_id,
    task_status_text,
    item_count,
    updated_at_utc
FROM dbo.mdl_annotation_task
WHERE external_task_id = @external_task_id";
            command.Parameters.AddWithValue("@external_task_id", cvatTaskId.ToString());

            using var reader = command.ExecuteReader();
            if (!reader.Read())
            {
                return Result<AnnotationTaskDetailDto?>.Success(null, message: "未找到对应的任务快照。" );
            }

            var detail = new AnnotationTaskDetailDto
            {
                Platform = AnnotationPlatformEnum.Cvat,
                CvatTaskId = long.TryParse(reader["external_task_id"]?.ToString(), out var taskId) ? taskId : cvatTaskId,
                TaskName = reader["task_name"]?.ToString() ?? string.Empty,
                CvatProjectId = reader["cvat_project_id"] is DBNull ? null : Convert.ToInt64(reader["cvat_project_id"]),
                TaskStatus = reader["task_status_text"]?.ToString() ?? string.Empty,
                ItemCount = reader["item_count"] is DBNull ? 0 : Convert.ToInt32(reader["item_count"]),
                UpdatedAtUtc = reader["updated_at_utc"] is DBNull ? null : Convert.ToDateTime(reader["updated_at_utc"]).ToUniversalTime()
            };

            return Result<AnnotationTaskDetailDto?>.Success(detail, message: "读取任务快照成功。" );
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError("读取标注任务快照失败。", ex, traceId);
            var failure = Result.FromException(ex, "ANNOTATION_TASK_QUERY_FAILED", "读取标注任务快照失败。", traceId);
            return Result<AnnotationTaskDetailDto?>.FailWithTrace(failure.Code, failure.Message, failure.TraceId ?? traceId, [.. failure.Errors]);
        }
    }

    private SqlConnection CreateOpenConnection()
    {
        if (string.IsNullOrWhiteSpace(_options.ConnectionString))
        {
            throw new InvalidOperationException("数据库连接字符串未配置。请设置 Persistence:ConnectionString。");
        }

        var connection = new SqlConnection(_options.ConnectionString);
        connection.Open();
        return connection;
    }

    private static int MapTaskStatus(string taskStatus)
    {
        return taskStatus.Trim().ToLowerInvariant() switch
        {
            "annotation" => 1,
            "in_progress" => 1,
            "completed" => 2,
            _ => 0
        };
    }
}