using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using Serilog;
using Newtonsoft.Json;
using LCU.Library.Internal.ApiResponse.Models;
using LCU.Library.Internal.FileOperationsModels.Models.NameSettings;
using LCU.Library.Internal.FileOperationsModels.Models;
using LCU.Api.Internal.ArchiverApi.Configuration;
using LCU.Api.Internal.MaidBotLib.Models;
using LCU.Library.Internal.ApiResponse.Services;
using LCU.Library.Internal.ArchiverApiModel.Models;
using LCU.Library.Internal.LcuMassTransitModels;

namespace LCU.Api.Internal.ArchiverApi.Services;

public class ArchiverService : IArchiverService
{
    private readonly ArchiverApiConfig _ArchiverApiConfig;
    private readonly IReportService _reportService;
    private readonly IFileOperationsService _fileOperationsService;
    private readonly ConnectionConfiguration _connectionConfiguration;
    private readonly ReceiveEndpointConfiguration _receiveEndpointsConfiguration;   

    private const string NameRegexStartTag = "{Regex0}";
    private const string NameRegexStart = "^(" + RegexStartCaseInsenstive;
    private const string NameRegexEndTag = "{Regex1}";
    private const string NameRegexEnd = RegexStopCaseInsenstive + ")";
    private const string AnyWordAndPeriodRegexTag = "{Regex2}";
    private const string AnyWordAndPeriodRegex = "\\w*\\.";
    private const string ExtensionRegexTag = "{Regex3}";
    private const string ExtensionRegexStart = "(";
    private const string ExtensionRegexEnd = ")$";
    private const string RegexPipe = "|";
    private const string RegexStartCaseInsenstive = "(?i)";
    private const string RegexStopCaseInsenstive = "(?-i)";

    public ArchiverService(ArchiverApiConfig ArchiverApiConfig,
                           IReportService reportService,
                           IFileOperationsService fileOperationsService,
                           ConnectionConfiguration connectionConfiguration,
                           ReceiveEndpointConfigurations receiveEndpointsConfiguration)
    {
        _ArchiverApiConfig = ArchiverApiConfig;
        _reportService = reportService;
        _fileOperationsService = fileOperationsService;
        _connectionConfiguration = connectionConfiguration;
        _receiveEndpointsConfiguration = receiveEndpointsConfiguration.ResponseReceiveEndpoint;
    }

    public void ExecuteRequest(ArchiveRequest archiveRequest)
    {
        try
        {
            var archiveResult = HandleArchiveRequest(archiveRequest);
            if (!archiveResult.archiveRequestResponse.IsSuccessful)
            {
                var errorMessage = String.Join("; ", archiveResult.archiveRequestResponse.MessageStack.ToArray());
                Log.Error($"Archive Request was not successful. MessaggeStack:{errorMessage}");                
            }

            //Happy path we queue return response later in ArchivecompletionService after the BulkOperations has been preformed.
            if (archiveResult.queueReturnResponse)
            {
                QueueReturnResponse.QueueResponse(archiveRequest, 
                                                  archiveResult.archiveRequestResponse.IsSuccessful, 
                                                  archiveResult.archiveRequestResponse.MessageStack);
            }
        }
        catch (Exception exception)
        {
            Log.ForContext(nameof(PropertyEnum.Group),
                           nameof(GroupEnum.ITDevelopment))
               .Error(exception, $"Error while archiving reports. Look into failed ArchiveRequest. " +
                          $"ArchiveRequest: {JsonConvert.SerializeObject(archiveRequest)}");
        }
    }

    public (ArchiveRequestResponse archiveRequestResponse, bool queueReturnResponse) HandleArchiveRequest(ArchiveRequest archiveRequest)
    {
        var archiveRequestResponse = new ArchiveRequestResponse();
        try
        {
            var reports = _reportService.GetReportsToArchiveAsync(archiveRequest).Result;
            if (!reports.Any())
            {
                Log.Information("No reports to bulk move.");
                archiveRequestResponse.MessageStack.Add("No application histories retrieved from DNA database to move.");
                archiveRequestResponse.IsSuccessful = archiveRequest.SucceedIfEmpty;
                return (archiveRequestResponse, true);
            }

            var bulkOperationRequest = BuildBulkOperationRequest(reports, archiveRequest);
            if (!bulkOperationRequest.OperationRequests.Any())
            {
                Log.Information("There are no files to bulk move.");
                archiveRequestResponse.MessageStack.Add("There are no files to bulk move.");
                archiveRequestResponse.IsSuccessful = archiveRequest.SucceedIfEmpty;
                return (archiveRequestResponse, true);
            }

            bulkOperationRequest = SetUpResponse(bulkOperationRequest, archiveRequest, archiveRequestResponse);
            _fileOperationsService.SendBulkOperationsAsync(bulkOperationRequest);
        }
        catch (Exception exception)
        {
            archiveRequestResponse.IsSuccessful = false;
            var anyIdentifiers = archiveRequest.ArchiveIdentifiers != null && archiveRequest.ArchiveIdentifiers.Any();
            var identifiers = anyIdentifiers ? String.Join(", ", archiveRequest.ArchiveIdentifiers.ToArray()) : "";
            archiveRequestResponse.MessageStack.Add($"Failure to execute archive request. " +
                                                    $"EffectiveDate: [{archiveRequest.EffectiveDate}], " +
                                                    $"DaysFromDate: [{archiveRequest.DaysFromDate}], " +
                                                    $"ArchiveDestinationBase: [{archiveRequest.ArchiveDestinationBase}], " +
                                                    $"Identifiers: [{identifiers}], " +
                                                    $"Exception: {exception} ");
        }

        return (archiveRequestResponse, !archiveRequestResponse.IsSuccessful);
    }

    public BulkOperationRequest<MoveFileRequest> BuildBulkOperationRequest(IEnumerable<Report> reports, ArchiveRequest archiveRequest)
    {
        try
        {
            var bulkOperationRequest = new BulkOperationRequest<MoveFileRequest>();
            bulkOperationRequest.OperationRequests = new List<MoveFileRequest>();
            var extensionRegex = new RegexSetting()
            {
                Tag = ExtensionRegexTag,
                Regex = BuildExtensionRegexString(archiveRequest)
            };
            var anyWordAndPeriodRegex = new RegexSetting()
            {
                Tag = AnyWordAndPeriodRegexTag,
                Regex = AnyWordAndPeriodRegex
            };

            foreach (var report in reports)
            {
                var nameSettings = SetUpNameSettings(report);

                nameSettings.RegexSettings.Add(anyWordAndPeriodRegex);
                nameSettings.RegexSettings.Add(extensionRegex);
                var dynamicallyNamedRequests = CreateOperationRequests(report, nameSettings, archiveRequest);
                bulkOperationRequest.OperationRequests.AddRange(dynamicallyNamedRequests);
            }

            return bulkOperationRequest;
        }
        catch (AggregateException exception)
        {
            throw new AggregateException($"Error while attempting to build bulk operation request. " +
                                $"Exception Message: {exception.Message}");
        }
        catch (Exception exception)
        {
            throw new Exception($"Error while attempting to build bulk operation request. " +
                                $"Exception Message: {exception.Message}");
        }
    }

    public string BuildExtensionRegexString(ArchiveRequest archiveRequest)
    {
        var regexStringBuilder = new StringBuilder();
        regexStringBuilder.Append(ExtensionRegexStart);

        for (int index = 0; index < archiveRequest.AllowedExensions.Count; ++index)
        {
            var pipe = index == archiveRequest.AllowedExensions.Count ? "" : RegexPipe;
            regexStringBuilder.Append(RegexStartCaseInsenstive +
                                      archiveRequest.AllowedExensions[index] +
                                      RegexStopCaseInsenstive +
                                      pipe);
        }

        regexStringBuilder.Append(ExtensionRegexEnd);
        return regexStringBuilder.ToString();
    }

    public List<MoveFileRequest> CreateOperationRequests(Report report, DynamicNameSetting nameSettings, ArchiveRequest archiveRequest)
    {
        var fileName = report.HasRegexMapping ? report.DisplayReportName : report.FinalReportName;
        
        DateTime effectiveDate = archiveRequest.EffectiveDate == null ? DateTime.MinValue : (DateTime)archiveRequest.EffectiveDate;
        var reportPath = $"{_ArchiverApiConfig.DnaBasePath}\\" +
                         $"{effectiveDate.ToString(_ArchiverApiConfig.ReportPathDateFormat)}\\" +
                         $"{report.QueueNumber}";
        var sourceFile = $"{NameRegexStartTag}{fileName}{NameRegexEndTag}{AnyWordAndPeriodRegexTag}{ExtensionRegexTag}";
        var files = _fileOperationsService.BuildDynamicFileListAsync(reportPath, sourceFile, nameSettings).Result;
        var dynamicallyNamedRequests = new List<MoveFileRequest>();

        foreach (var file in files)
        {
            var request = new MoveFileRequest()
            {
                SourcePath = reportPath,
                SourceFile = file,
                DestinationPath = archiveRequest.ArchiveDestinationBase,
                FileNameSetting = nameSettings
            };
            SetDestinationName(report, request, archiveRequest);
            dynamicallyNamedRequests.Add(request);
        }

        return dynamicallyNamedRequests;
    }

    public void SetDestinationName(Report report, MoveFileRequest request, ArchiveRequest archiveRequest)
    {
        var extention = archiveRequest.AllowedExensions
                             .FirstOrDefault(fe => request.SourceFile.Contains($".{fe}", StringComparison.OrdinalIgnoreCase));
        if (extention != null)
        {
            request.DestinationName = report.BuildDestinationName(request.FinalSourceFile, extention);
        }
    }

    public DynamicNameSetting SetUpNameSettings(Report report) {
        var nameSettings = new DynamicNameSetting();
        nameSettings.RegexSettings = new List<RegexSetting>()
        {
            new RegexSetting()
            {
                Tag = NameRegexStartTag,
                Regex = NameRegexStart
            },
            new RegexSetting()
            {
                Tag = NameRegexEndTag,
                Regex = NameRegexEnd
            }
        };

        if (report.ApplicationMapping == null)
        {
            return nameSettings;
        };
            
        foreach (var regex in report.ApplicationMapping.RegexMappings)
        {
            nameSettings.RegexSettings.Add(new RegexSetting()
            {
                Tag = regex.Tag,
                Regex = regex.Regex,
            });
        }
        return nameSettings;
    }

    public BulkOperationRequest<MoveFileRequest> SetUpResponse(BulkOperationRequest<MoveFileRequest> bulkOperationRequest,
                                                               ArchiveRequest archiveRequest,
                                                               ArchiveRequestResponse archiveRequestResponse)
    {
        var archiveResponsePayload = new ArchiveResponsePayload()
        {
            ArchiveRequest = archiveRequest,
            BulkOperationRequest = bulkOperationRequest,
            ArchiveRequestResponse = archiveRequestResponse
        };

        var responseItem = new ResponseItem
        {
            ReturnQueueConsumerConfig = new QueueConsumerConfig()
            {
                ExchangeName = _receiveEndpointsConfiguration.ReceiveEndpoint
            },
            ReturnQueueConnectionConfig = new QueueConnectionConfig()
            {
                Url = _connectionConfiguration.HostUrl,
                Username = _connectionConfiguration.UserName,
                Password = _connectionConfiguration.Password
            },
            ResponsePayload = JsonConvert.SerializeObject(archiveResponsePayload)
        };

        bulkOperationRequest.ResponseItems = new List<ResponseItem>()
        {
            responseItem
        };

        return bulkOperationRequest;
    }
}