using DigitalData.Core.Abstraction.Application.Repository;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.Configuration.Queries;
using EnvelopeGenerator.Application.Envelopes.Queries;
using EnvelopeGenerator.Domain.Constants;
using EnvelopeGenerator.Domain.Entities;
using EnvelopeGenerator.ServiceHost.Exceptions;
using EnvelopeGenerator.ServiceHost.Extensions;
using EnvelopeGenerator.ServiceHost.Jobs.FinalizeDocument;
using GdPicture14;
using MediatR;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using System.Data;

namespace EnvelopeGenerator.ServiceHost.Jobs;

[Obsolete("ActionService is a placeholder service added by copilot. Migrate the actual logic from CommonServices.Jobs")]
public class FinalizeDocumentJob(IOptions<WorkerOptions> options, ILogger<FinalizeDocumentJob> logger, TempFiles tempFiles, ActionService actionService, PDFBurner pdfBurner, PDFMerger pdfMerger, ReportCreator reportCreator, GdViewer? _gdViewer, LicenseManager licenseManager, IMediator mediator, IRepository<Envelope> envRepo, IRepository<Domain.Entities.DocumentStatus> docStatusRepo)
{
    private readonly WorkerOptions _options = options.Value;

    private ConfigDto? _config;
    
    private const int CompleteWaitTime = 1;
    private string _parentFolderUid = string.Empty;

    private sealed class EnvelopeData
    {
        public int EnvelopeId { get; set; }
        public string EnvelopeUuid { get; set; } = string.Empty;
        public string DocumentPath { get; set; } = string.Empty;
        public List<string> AnnotationData { get; set; } = new();
        public byte[]? DocAsByte { get; set; }
    }

    public bool RethrowOnError { get; set; } = true;

    public async Task ExecuteAsync(IEnumerable<EnvelopeDto> envelopes, CancellationToken cancel = default)
    {
        var gdPictureKey = _options.GdPictureLicenseKey;
        tempFiles.Create();
        var jobId = typeof(FinalizeDocumentJob).FullName;

        _config = await mediator.Send(new ReadDefaultConfigQuery(), cancel);

        foreach (var envelope in envelopes)
        {
            try
            {
                await Finalize(envelope, cancel);
            }
            catch (Exception ex)
            {
                logger.LogWarning(ex, "An unexpected exception was ignored while processing the envelope with ID [{id}].", envelope.Id);

                if(RethrowOnError)
                    throw;
            }
        }
    }

    public async Task ExecuteAsync(CancellationToken cancel = default)
    {
        var envelopes = await mediator.Send(new ReadEnvelopeQuery()
        {
            Status = new () { Include = [EnvelopeStatus.EnvelopeCompletelySigned] },
            MinMinutesSinceLastChange = CompleteWaitTime,
        }, cancel);

        await ExecuteAsync(envelopes, cancel);
    }

    private async Task Finalize(EnvelopeDto envelope, CancellationToken cancel)
    {
        var annotations = await docStatusRepo.Where(s => s.EnvelopeId == envelope.Id).Select(s => s.Value).ToListAsync(cancel);
        var burnedDocument = pdfBurner!.BurnAnnotsToPDF(envelope.Documents?.FirstOrDefault()?.ByteData!, annotations, envelope.Id)
            ?? throw new ApplicationException("Document could not be finalized");

        actionService.CreateReport(envelope, cancel);

        var report = await reportCreator!.CreateReportAsync(envelope, cancel);

        var mergedDocument = pdfMerger!.MergeDocuments(burnedDocument, report);

        var outputDirectoryPath = Path.Combine(_config!.ExportPath, _parentFolderUid);

        if (!Directory.Exists(outputDirectoryPath))
            Directory.CreateDirectory(outputDirectoryPath);

        var outputFilePath = Path.Combine(outputDirectoryPath, $"{envelope.Uuid}.pdf");

        try
        {
            File.WriteAllBytes(outputFilePath, mergedDocument);
        }
        catch (Exception ex)
        {
            throw new ExportDocumentException("Could not export final document to disk. Envelope Id is " + envelope.Id, ex);
        }

        var outputFile = await File.ReadAllBytesAsync(outputFilePath, cancel);
        await envRepo.UpdateAsync(e => e.DocResult = outputFile, e => e.Id == envelope.Id, cancel);

        SendFinalEmails(envelope);

        actionService.FinalizeEnvelope(envelope, cancel);
    }

    private bool SendFinalEmails(EnvelopeDto envelope)
    {
        var mailToCreator = (FinalEmailType)(envelope.FinalEmailToCreator ?? 0);
        var mailToReceivers = (FinalEmailType)(envelope.FinalEmailToReceivers ?? 0);

        if (mailToCreator != FinalEmailType.No)
            SendFinalEmailToCreator(envelope, mailToCreator);
        else
            logger?.LogWarning("No SendFinalEmailToCreator - oMailToCreator [{mailToCreator}] <> [{noFinalEmailType}] ", mailToCreator, FinalEmailType.No);

        if (mailToReceivers != FinalEmailType.No)
        {
            SendFinalEmailToReceivers(envelope, mailToReceivers);
        }
        else
        {
            logger?.LogWarning("No SendFinalEmailToReceivers - oMailToCreator [{mailToReceivers}] <> [{noFinalEmailType}] ", mailToReceivers, FinalEmailType.No);
        }

        return true;
    }

    private bool SendFinalEmailToCreator(EnvelopeDto envelope, FinalEmailType mailToCreator)
    {
        if (actionService.CompleteEnvelope(envelope) == false)
        {
            logger?.LogError(new Exception("CompleteEnvelope failed"), "Envelope could not be completed for receiver [{email}]", envelope.User?.Email);
            return false;
        }

        return true;
    }

    private bool SendFinalEmailToReceivers(EnvelopeDto envelope, FinalEmailType mailToReceivers)
    {
        foreach (var receiver in envelope.EnvelopeReceivers ?? [])
        {
            if (!actionService.CompleteEnvelope(envelope, receiver.Receiver!))
                return false;
        }

        return true;
    }
}