using AutoMapper;
using DigitalData.Core.Abstraction.Application.DTO;
using EnvelopeGenerator.Application.Interfaces.Services;
using EnvelopeGenerator.Application.Interfaces.SQLExecutor;
using EnvelopeGenerator.Application.Dto.Receiver;
using EnvelopeGenerator.Application.EnvelopeReceivers.Commands;
using EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
using EnvelopeGenerator.Application.Envelopes.Queries;
using EnvelopeGenerator.Application.SQL;
using EnvelopeGenerator.Domain.Entities;
using EnvelopeGenerator.GeneratorAPI.Models;
using MediatR;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Data.SqlClient;
using Microsoft.Extensions.Options;
using System.Data;
using System.Reflection.Metadata;
using EnvelopeGenerator.Domain;

namespace EnvelopeGenerator.GeneratorAPI.Controllers;

/// <summary>
/// Controller für die Verwaltung von Umschlagempfängern.
/// </summary>
/// <remarks>
/// Dieser Controller bietet Endpunkte für das Abrufen und Verwalten von Umschlagempfängerdaten.
/// </remarks>
[Route("api/[controller]")]
[Authorize]
[ApiController]
public class EnvelopeReceiverController : ControllerBase
{
    private readonly ILogger<EnvelopeReceiverController> _logger;

    [Obsolete("Use MediatR")]
    private readonly IEnvelopeReceiverService _erService;

    private readonly IMediator _mediator;

    private readonly IMapper _mapper;

    private readonly IEnvelopeExecutor _envelopeExecutor;

    private readonly IEnvelopeReceiverExecutor _erExecutor;

    private readonly IDocumentExecutor _documentExecutor;

    private readonly string _cnnStr;

    /// <summary>
    /// Konstruktor für den EnvelopeReceiverController.
    /// </summary>
    /// <param name="logger">Logger-Instanz zur Protokollierung von Informationen und Fehlern.</param>
    /// <param name="envelopeReceiverService">Service zur Verwaltung von Umschlagempfängern.</param>
    /// <param name="mediator">Mediator-Instanz zur Verarbeitung von Befehlen und Abfragen.</param>
    /// <param name="mapper"></param>
    /// <param name="envelopeExecutor"></param>
    /// <param name="erExecutor"></param>
    /// <param name="documentExecutor"></param>
    /// <param name="csOpt"></param>
    [Obsolete("Use MediatR")]
    public EnvelopeReceiverController(ILogger<EnvelopeReceiverController> logger, IEnvelopeReceiverService envelopeReceiverService, IMediator mediator, IMapper mapper, IEnvelopeExecutor envelopeExecutor, IEnvelopeReceiverExecutor erExecutor, IDocumentExecutor documentExecutor, IOptions<ConnectionString> csOpt)
    {
        _logger = logger;
        _erService = envelopeReceiverService;
        _mediator = mediator;
        _mapper = mapper;
        _envelopeExecutor = envelopeExecutor;
        _erExecutor = erExecutor;
        _documentExecutor = documentExecutor;
        _cnnStr = csOpt.Value.Value;
    }

    /// <summary>
    /// Ruft eine Liste von Umschlagempfängern basierend auf den angegebenen Abfrageparametern ab.
    /// </summary>
    /// <param name="envelopeReceiver">Die Abfrageparameter für die Filterung von Umschlagempfängern.</param>
    /// <returns>Eine HTTP-Antwort mit der Liste der gefundenen Umschlagempfänger oder einem Fehlerstatus.</returns>
    /// <remarks>
    /// Dieser Endpunkt ermöglicht es, Umschlagempfänger basierend auf dem Benutzernamen und optionalen Statusfiltern abzurufen.
    /// Wenn der Benutzername nicht ermittelt werden kann, wird ein Serverfehler zurückgegeben.
    /// </remarks>
    /// <response code="200">Die Liste der Umschlagempfänger wurde erfolgreich abgerufen.</response>
    /// <response code="401">Wenn kein autorisierter Token vorhanden ist</response>
    /// <response code="500">Ein unerwarteter Fehler ist aufgetreten.</response>
    [Authorize]
    [HttpGet]
    [Obsolete("Use MediatR")]
    public async Task<IActionResult> GetEnvelopeReceiver([FromQuery] ReadEnvelopeReceiverQuery envelopeReceiver)
    {
        var username = User.GetUsernameOrDefault();

        if (username is null)
        {
            _logger.LogError(@"Envelope Receiver dto cannot be sent because username claim is null. Potential authentication and authorization error. The value of other claims are [id: {id}], [username: {username}], [name: {name}], [prename: {prename}], [email: {email}].",
                User.GetId(), User.GetUsernameOrDefault(), User.GetNameOrDefault(), User.GetPrenameOrDefault(), User.GetEmailOrDefault());
            return StatusCode(StatusCodes.Status500InternalServerError);
        }

        return await _erService.ReadByUsernameAsync(
            username: username,
            min_status: envelopeReceiver.Envelope.Status?.Min,
            max_status: envelopeReceiver.Envelope.Status?.Max,
            envelopeQuery: envelopeReceiver.Envelope,
            receiverQuery: envelopeReceiver.Receiver,
            ignore_statuses: envelopeReceiver.Envelope.Status?.Ignore ?? Array.Empty<Constants.EnvelopeStatus>())
            .ThenAsync(
                Success: Ok,
                Fail: IActionResult (msg, ntc) =>
                {
                    _logger.LogNotice(ntc);
                    return StatusCode(StatusCodes.Status500InternalServerError, msg);
                });
    }

    /// <summary>
    /// Ruft den Namen des zuletzt verwendeten Empfängers basierend auf der angegebenen E-Mail-Adresse ab.
    /// </summary>
    /// <param name="receiver">Abfrage, bei der nur eine der Angaben ID, Signatur oder E-Mail-Adresse des Empfängers eingegeben werden muss.</param>
    /// <returns>Eine HTTP-Antwort mit dem Namen des Empfängers oder einem Fehlerstatus.</returns>
    /// <remarks>
    /// Dieser Endpunkt ermöglicht es, den Namen des zuletzt verwendeten Empfängers basierend auf der E-Mail-Adresse abzurufen.
    /// </remarks>
    /// <response code="200">Der Name des Empfängers wurde erfolgreich abgerufen.</response>
    /// <response code="401">Wenn kein autorisierter Token vorhanden ist</response>
    /// <response code="404">Kein Empfänger gefunden.</response>
    /// <response code="500">Ein unerwarteter Fehler ist aufgetreten.</response>
    [Authorize]
    [HttpGet("salute")]
    [Obsolete("Use MediatR")]
    public async Task<IActionResult> GetReceiverName([FromQuery] ReadReceiverNameQuery receiver)
    {
        return await _erService.ReadLastUsedReceiverNameByMailAsync(receiver.EmailAddress, receiver.Id, receiver.Signature).ThenAsync(
                        Success: res => res is null ? NotFound() : Ok(res),
                        Fail: IActionResult (msg, ntc) =>
                        {
                            if (ntc.HasFlag(Flag.NotFound))
                                return NotFound();

                            _logger.LogNotice(ntc);
                            return StatusCode(StatusCodes.Status500InternalServerError);
                        });
    }

    /// <summary>
    /// Datenübertragungsobjekt mit Informationen zu Umschlägen, Empfängern und Unterschriften.
    /// </summary>
    /// <param name="request"></param>
    /// <returns>HTTP-Antwort</returns>
    /// <remarks>
    /// Sample request:
    ///
    ///     POST /api/envelope
    ///     {
    ///        "title": "Vertragsdokument",
    ///        "message": "Bitte unterschreiben Sie dieses Dokument.",
    ///        "document": {
    ///            "dataAsBase64": "dGVzdC1iYXNlNjQtZGF0YQ=="  
    ///        },
    ///        "receivers": [
    ///            {
    ///                "emailAddress": "example@example.com",
    ///                "signatures": [
    ///                    {
    ///                        "x": 100,
    ///                        "y": 200,
    ///                        "page": 1
    ///                    }
    ///                ],
    ///                "name": "Max Mustermann",
    ///                "phoneNumber": "+49123456789"
    ///            }
    ///        ],
    ///        "tfaEnabled": false
    ///     }
    ///
    /// </remarks>
    /// <response code="202">Envelope-Erstellung und Sendeprozessbefehl erfolgreich</response>
    /// <response code="400">Wenn ein Fehler im HTTP-Body auftritt</response>
    /// <response code="401">Wenn kein autorisierter Token vorhanden ist</response>
    /// <response code="500">Es handelt sich um einen unerwarteten Fehler. Die Protokolle sollten überprüft werden.</response>
    [Authorize]
    [HttpPost]
    public async Task<IActionResult> CreateAsync([FromBody] CreateEnvelopeReceiverCommand request)
    {
        CancellationToken cancel = default;
        int userId = User.GetId();

        #region Create Envelope
        var envelope = await _envelopeExecutor.CreateEnvelopeAsync(userId, request.Title, request.Message, request.TFAEnabled, cancel);
        #endregion

        #region Add receivers
        List<EnvelopeReceiver> sentReceivers = new();
        List<ReceiverGetOrCreateCommand> unsentReceivers = new();

        foreach (var receiver in request.Receivers)
        {
            var envelopeReceiver = await _erExecutor.AddEnvelopeReceiverAsync(envelope.Uuid, receiver.EmailAddress, receiver.Salution, receiver.PhoneNumber, cancel);

            if (envelopeReceiver is null)
                unsentReceivers.Add(receiver);
            else
                sentReceivers.Add(envelopeReceiver);
        }

        var res = _mapper.Map<CreateEnvelopeReceiverResponse>(envelope);
        res.UnsentReceivers = unsentReceivers;
        res.SentReceiver = _mapper.Map<List<ReceiverReadDto>>(sentReceivers.Select(er => er.Receiver));
        #endregion

        #region Add document
        var document = await _documentExecutor.CreateDocumentAsync(request.Document.DataAsBase64, envelope.Uuid, cancel);

        if (document is null)
            return StatusCode(StatusCodes.Status500InternalServerError, "Document creation is failed.");
        #endregion

        #region Add document element
        // @DOC_ID, @RECEIVER_ID, @POSITION_X, @POSITION_Y, @PAGE
        string sql = @"
                DECLARE @OUT_SUCCESS bit;

                EXEC [dbo].[PRSIG_API_ADD_DOC_RECEIVER_ELEM]
                    {0},
                    {1},
                    {2},
                    {3},
                    {4},
                    @OUT_SUCCESS OUTPUT;

                SELECT @OUT_SUCCESS as [@OUT_SUCCESS];";

        foreach (var rcv in res.SentReceiver)
            foreach (var sign in request.Receivers.Where(r => r.EmailAddress == rcv.EmailAddress).FirstOrDefault()?.Signatures ?? Array.Empty<Signature>())
            {
                using (SqlConnection conn = new(_cnnStr))
                {
                    conn.Open();

                    var formattedSQL = string.Format(sql, document.Id.ToSqlParam(), rcv.Id.ToSqlParam(), sign.X.ToSqlParam(), sign.Y.ToSqlParam(), sign.Page.ToSqlParam());

                    using SqlCommand cmd = new SqlCommand(formattedSQL, conn);
                    cmd.CommandType = CommandType.Text;

                    using SqlDataReader reader = cmd.ExecuteReader();
                    if (reader.Read())
                    {
                        bool outSuccess = reader.GetBoolean(0);
                    }
                }
            }
        #endregion

        #region Create history
        // ENV_UID, STATUS_ID, USER_ID,
        string sql_hist = @"
                USE [DD_ECM]

                DECLARE @OUT_SUCCESS bit;

                EXEC [dbo].[PRSIG_API_ADD_HISTORY_STATE]
                    {0},
                    {1},
                    {2},
                    @OUT_SUCCESS OUTPUT;

                SELECT @OUT_SUCCESS as [@OUT_SUCCESS];";

        using (SqlConnection conn = new(_cnnStr))
        {
            conn.Open();
            var formattedSQL_hist = string.Format(sql_hist, envelope.Uuid.ToSqlParam(), 1003.ToSqlParam(), userId.ToSqlParam());
            using (SqlCommand cmd = new SqlCommand(formattedSQL_hist, conn))
            {
                cmd.CommandType = CommandType.Text;

                using (SqlDataReader reader = cmd.ExecuteReader())
                {
                    if (reader.Read())
                    {
                        bool outSuccess = reader.GetBoolean(0);
                    }
                }
            }
        }
        #endregion

        return Ok(res);
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static bool IsBase64String(string input)
    {
        if (string.IsNullOrWhiteSpace(input))
            return false;

        try
        {
            Convert.FromBase64String(input);
            return true;
        }
        catch (FormatException)
        {
            return false;
        }
    }

}