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

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, IConfiguration config, ILogger<FinalizeDocumentJob> logger, TempFiles tempFiles, ActionService actionService, PDFBurner pdfBurner, PDFMerger pdfMerger, ReportCreator reportCreator, ReportModel _reportModel, MSSQLServer _database, 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(CancellationToken cancel = default)
    {
        var gdPictureKey = _options.GdPictureLicenseKey;
        tempFiles.Create();
        var jobId = typeof(FinalizeDocumentJob).FullName;

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

        var envelopes = await envRepo
            .Where(e => e.Status == EnvelopeStatus.EnvelopeCompletelySigned
                && e.ChangedWhen.HasValue
                && EF.Functions.DateDiffMinute(e.ChangedWhen.Value, DateTime.Now) >= CompleteWaitTime)
            .OrderBy(e => e.Id)
            .ToListAsync(cancel);

        if (envelopes.Count > 0)
            logger.LogInformation("Found [{count}] completed envelopes.", envelopes.Count);

        foreach (var envelope in envelopes)
        {
            try
            {
                await Finalize(envelope, cancel);
            }
            catch (Exception ex)
            {
                logger.LogError(ex, "Unhandled exception while working envelope [{id}]", envelope.Id);

                if(RethrowOnError)
                    throw;
            }

            logger.LogInformation("Envelope [{id}] finalized!", envelope.Id);
        }
    }

    private async Task Finalize(Envelope envelope, CancellationToken cancel)
    {
        var annotations = await docStatusRepo.Where(s => s.EnvelopeId == envelope.Id).Select(s => s.Value).ToListAsync(cancel);
        var burnedDocument = pdfBurner!.BurnAnnotsToPDF(envelope.DefaultDocument.ByteData!, annotations, envelope.Id);

        if (burnedDocument is null)
        {
            logger.LogWarning("Document could not be finalized!");
            throw new ApplicationException("Document could not be finalized");
        }

        if (actionService?.CreateReport(envelope) == false)
        {
            logger.LogWarning("Document Report could not be created!");
            throw new ApplicationException("Document Report could not be created");
        }

        var report = reportCreator!.CreateReport(envelope);

        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");
        logger.LogInformation("Output path is [{outputFilePath}]", outputFilePath);

        try
        {
            File.WriteAllBytes(outputFilePath, mergedDocument);
        }
        catch (Exception ex)
        {
            logger.LogWarning("Could not export final document to disk!");
            throw new ExportDocumentException("Could not export final document to disk!", ex);
        }

        UpdateFileDb(outputFilePath, envelope.Id);

        if (!SendFinalEmails(envelope))
            throw new ApplicationException("Final emails could not be sent!");

        logger.LogInformation("Report-mails successfully sent!");

        if (actionService?.FinalizeEnvelope(envelope) == false)
        {
            logger.LogWarning("Envelope could not be finalized!");
            throw new ApplicationException("Envelope could not be finalized");
        }
    }

    private void UpdateFileDb(string filePath, long envelopeId)
    {
        try
        {
            var imageData = ReadFile(filePath);
            if (imageData is null)
            {
                return;
            }

            var query = $"UPDATE TBSIG_ENVELOPE SET DOC_RESULT = @ImageData WHERE GUID = {envelopeId}";
            using var command = new SqlCommand(query, _database!.GetConnection);
            command.Parameters.Add(new SqlParameter("@ImageData", imageData));
            command.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            logger?.LogError(ex);
        }
    }

    private static byte[]? ReadFile(string path)
    {
        var fileInfo = new FileInfo(path);
        var numBytes = fileInfo.Length;
        using var stream = new FileStream(path, FileMode.Open, FileAccess.Read);
        using var reader = new BinaryReader(stream);
        return reader.ReadBytes((int)numBytes);
    }

    private bool SendFinalEmails(Envelope 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(Envelope 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(Envelope envelope, FinalEmailType mailToReceivers)
    {
        foreach (var receiver in envelope.EnvelopeReceivers ?? Enumerable.Empty<EnvelopeReceiver>())
        {
            if (actionService?.CompleteEnvelope(envelope, receiver.Receiver) == false)
            {
                logger?.LogError(new Exception("CompleteEnvelope failed"), "Envelope could not be completed for receiver [{email}]", receiver.Receiver?.EmailAddress);
                return false;
            }
        }

        return true;
    }
}