using Dapper;
using FastEndpoints;
using Modules.WMS.Picking.Shared;
using Npgsql;
using Shared.Problems;

namespace Modules.WMS.Picking.Exceptions;

public sealed record Request(
    Guid? LineId,
    string Type,
    string? Memo,
    string IdempotencyKey,
    long ExpectedVersion);

public sealed class Endpoint(NpgsqlDataSource dataSource)
    : Endpoint<Request, PickingTaskDto>
{
    public override void Configure()
    {
        Post("/api/wms/picking/tasks/{taskId:guid}/exceptions");
        Permissions("wms.picking.execute");
    }

    public override async Task HandleAsync(Request req, CancellationToken ct)
    {
        var taskId = Route<Guid>("taskId");
        var allowed = new[] { "no-stock", "short-quantity", "wrong-location", "damaged-item", "barcode-issue", "other" };
        if (!allowed.Contains(req.Type))
        {
            await Send.ResponseAsync(KbxValidationProblem.Create(
                new KbxValidationError("type", null, "EXCEPTION_TYPE_INVALID", "문제 유형을 확인하세요.")), 400, cancellation: ct);
            return;
        }

        await using var connection = await dataSource.OpenConnectionAsync(ct);
        await using var tx = await connection.BeginTransactionAsync(ct);

        var currentVersion = await connection.QuerySingleOrDefaultAsync<long?>(new CommandDefinition(
            "select version from wms.picking_tasks where id=@TaskId for update",
            new { TaskId = taskId }, tx, cancellationToken: ct));

        if (currentVersion is null)
        {
            await tx.RollbackAsync(ct);
            await SendNotFoundAsync(ct);
            return;
        }

        var duplicate = await connection.ExecuteScalarAsync<bool>(new CommandDefinition(
            "select exists(select 1 from wms.picking_exceptions where task_id=@TaskId and idempotency_key=@Key)",
            new { TaskId = taskId, Key = req.IdempotencyKey }, tx, cancellationToken: ct));
        if (duplicate)
        {
            await tx.RollbackAsync(ct);
            var existing = await PickingTaskQueries.GetAsync(connection, null, taskId, ct);
            await Send.OkAsync(existing!, ct);
            return;
        }

        if (currentVersion != req.ExpectedVersion)
        {
            await tx.RollbackAsync(ct);
            await Send.ResponseAsync(KbxConflictProblem.Version(currentVersion), 409, cancellation: ct);
            return;
        }

        await connection.ExecuteAsync(new CommandDefinition("""
            insert into wms.picking_exceptions(
                id, task_id, line_id, exception_type, memo, status, reported_at, reported_by, idempotency_key)
            values (@Id, @TaskId, @LineId, @Type, @Memo, 'OPEN', now(), @Actor, @Key)
            on conflict (task_id, idempotency_key) do nothing;

            update wms.picking_tasks
               set status='BLOCKED', version=version+1, updated_at=now()
             where id=@TaskId;

            insert into audit.entries(id, aggregate_type, aggregate_id, action, actor, occurred_at, data)
            values (@AuditId, 'WmsPickingTask', @TaskId, 'PickingExceptionReported', @Actor, now(),
                    jsonb_build_object('type', @Type, 'lineId', @LineId, 'memo', @Memo));

            insert into integration.outbox(id,event_type,aggregate_id,payload,occurred_at,status)
            values (@EventId,'WmsPickingExceptionReported',@TaskId,
                    jsonb_build_object('taskId',@TaskId,'lineId',@LineId,'type',@Type),now(),'PENDING');
            """, new {
                Id = Guid.NewGuid(),
                AuditId = Guid.NewGuid(),
                EventId = Guid.NewGuid(),
                TaskId = taskId,
                req.LineId,
                req.Type,
                req.Memo,
                Key = req.IdempotencyKey,
                Actor = User.Identity?.Name ?? "unknown",
            }, tx, cancellationToken: ct));

        await tx.CommitAsync(ct);
        var task = await PickingTaskQueries.GetAsync(connection, null, taskId, ct);
        await SendOkAsync(task! with { Message = "문제를 등록했습니다. 관리자 확인이 필요합니다." }, ct);
    }
}