using MediatR;
using EnvelopeGenerator.Application.Histories.Commands;
using EnvelopeGenerator.Domain.Constants;
using EnvelopeGenerator.Application.EnvelopeReports;
using EnvelopeGenerator.Application.Exceptions;
using EnvelopeGenerator.Domain.Entities;

namespace EnvelopeGenerator.Application.Pdf.Behaviors;

/// <summary>
/// 
/// </summary>
public class AddReportBehavior : IPipelineBehavior<BurnPdfCommand, byte[]>
{
    private readonly ISender _sender;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="sender"></param>
    public AddReportBehavior(ISender sender)
    {
        _sender = sender;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="next"></param>
    /// <param name="cancel"></param>
    /// <returns></returns>
    public async Task<byte[]> Handle(BurnPdfCommand request, RequestHandlerDelegate<byte[]> next, CancellationToken cancel)
    {
        var docResult = await next(cancel);
        var base64 = Convert.ToBase64String(docResult);

        if (!request.Debug)
            await _sender.Send(new CreateHistoryCommand()
            {
                EnvelopeId = request.EnvelopeId,
                UserReference = "System",
                Status = EnvelopeStatus.EnvelopeReportCreated,
            }, cancel);

        docResult = await CreateReport(request.Envelope!, cancel);

        return docResult;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="envelope"></param>
    /// <param name="cancel"></param>
    /// <returns></returns>
    /// <exception cref="CreateReportException"></exception>
    public async Task<byte[]> CreateReport(Envelope envelope, CancellationToken cancel)
    {
        var oItems = await _sender.ReadEnvelopeReportAsync(envelope.Id, cancel: cancel);

        if (!oItems.Any())
        {
            throw new CreateReportException("No report data found!");
        }

        var oBuffer = DoCreateReport(oItems);

        return oBuffer;
    }
}