using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using GB5Shared.ScanIdentifier;
using WiBLL.ScanIdentifier;
using static GB5Shared.GB5Constant.Constant;

namespace WiSL.EndPoints.ScanIdentifier;

// Print facility's batch action — renders one PDF (one page per selected row, sized to the
// chosen label's real dimensions) and marks every row printed. Mirrors GenerateScanCode.cs's
// BaseEndpoint + HttpContext.Response.SendStreamAsync + return null! pattern for streaming a
// generated file back, rather than a JSON envelope.
public class PrintBatch : BaseEndpoint<PrintBatch.Parameters, ResponseStandardDTO<object>>
{
    private readonly IWiScanIdentifierBLL _bll;

    public PrintBatch(IWiScanIdentifierBLL bll) => _bll = bll;

    public override void Configure()
    {
        Post("/ScanIdentifier/PrintBatch");
        AllowAnonymous();
    }

    public record Parameters(
        [property: FromHeader] string             Login,
        [property: FromBody]   PrintBatchRequestDTO Request
    );

    protected override string? GetCacheKey(Parameters req, LoginDTO login) => null;

    protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(Parameters req, LoginDTO login, CancellationToken ct)
    {
        try
        {
            var pdfBytes = await _bll.PrintBatchAsync(req.Request, login, ct).ConfigureAwait(false);

            using var ms = new MemoryStream(pdfBytes);
            await HttpContext.Response.SendStreamAsync(ms, "scan-labels.pdf", ms.Length, "application/pdf", cancellation: ct);

            return null!;
        }
        catch (InvalidOperationException ex)
        {
            return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 400);
        }
        catch (Exception ex)
        {
            return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500);
        }
    }
}