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)
{
    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
            {
                Finalize(envelope);
            }
            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 void Finalize(Envelope envelope)
    {
        var envelopeData = GetEnvelopeData(envelope.Id);

        if (envelopeData is null)
        {
            logger.LogWarning("EnvelopeData could not be loaded for Id [{id}]!", envelope.Id);
            throw new ArgumentNullException(nameof(EnvelopeData));
        }

        var burnedDocument = BurnAnnotationsToPdf(envelopeData);
        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)
    {
        var includeAttachment = SendFinalEmailWithAttachment(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)
    {
        var includeAttachment = SendFinalEmailWithAttachment(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 [{0}]", receiver.Receiver?.EmailAddress);
                return false;
            }
        }

        return true;
    }

    private static bool SendFinalEmailWithAttachment(FinalEmailType type)
    {
        return type == FinalEmailType.YesWithAttachment;
    }

    private byte[] BurnAnnotationsToPdf(EnvelopeData envelopeData)
    {
        var envelopeId = envelopeData.EnvelopeId;

        logger?.LogInformation("Burning [{0}] signatures", envelopeData.AnnotationData.Count);
        var annotations = envelopeData.AnnotationData;
        var inputPath = string.Empty;
        if (envelopeData.DocAsByte is null)
        {
            inputPath = envelopeData.DocumentPath;
            logger?.LogInformation("Input path: [{0}]", inputPath);
        }
        else
        {
            inputPath = _config!.DocumentPath;
        }

        if (envelopeData.DocAsByte is null)
        {
            var directorySource = Path.GetDirectoryName(inputPath) ?? string.Empty;
            var split = directorySource.Split('\\');
            _parentFolderUid = split[^1];
        }
        else
        {
            _parentFolderUid = envelopeData.EnvelopeUuid;
        }

        logger?.LogInformation("ParentFolderUID: [{0}]", _parentFolderUid);
        byte[] inputDocumentBuffer;
        if (envelopeData.DocAsByte is not null)
        {
            inputDocumentBuffer = envelopeData.DocAsByte;
        }
        else
        {
            try
            {
                inputDocumentBuffer = File.ReadAllBytes(inputPath);
            }
            catch (Exception ex)
            {
                throw new BurnAnnotationException("Source document could not be read from disk!", ex);
            }
        }

        return pdfBurner!.BurnAnnotsToPDF(inputDocumentBuffer, annotations, envelopeId);
    }

    private EnvelopeData? GetEnvelopeData(int envelopeId)
    {
        var sql = $"SELECT T.GUID, T.ENVELOPE_UUID, T.ENVELOPE_TYPE, T2.FILEPATH, T2.BYTE_DATA FROM [dbo].[TBSIG_ENVELOPE] T\n                JOIN TBSIG_ENVELOPE_DOCUMENT T2 ON T.GUID = T2.ENVELOPE_ID\n                WHERE T.GUID = {envelopeId}";
        var table = _database!.GetDatatable(sql);
        var row = table.Rows.Cast<DataRow>().SingleOrDefault();
        if (row is null)
        {
            return null;
        }

        var annotationData = GetAnnotationData(envelopeId);
        var data = new EnvelopeData
        {
            EnvelopeId = envelopeId,
            DocumentPath = row.ItemEx("FILEPATH", string.Empty),
            AnnotationData = annotationData,
            DocAsByte = row.Field<byte[]?>("BYTE_DATA"),
            EnvelopeUuid = row.ItemEx("ENVELOPE_UUID", string.Empty)
        };

        return data;
    }

    private List<string> GetAnnotationData(int envelopeId)
    {
        var sql = $"SELECT VALUE FROM TBSIG_DOCUMENT_STATUS WHERE ENVELOPE_ID = {envelopeId}";
        var table = _database!.GetDatatable(sql);

        return [.. table.Rows.Cast<DataRow>().Select(r => r.ItemEx("VALUE", string.Empty))];
    }
}