using EnvelopeGenerator.Application.Contracts;
using EnvelopeGenerator.Application.Services;
using EnvelopeGenerator.Common;
using EnvelopeGenerator.Web.Services;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;
using Microsoft.AspNetCore.Authorization;
using DigitalData.Core.API;
using EnvelopeGenerator.Application;
using Microsoft.Extensions.Localization;
using DigitalData.Core.DTO;
using EnvelopeGenerator.Application.Resources;
using EnvelopeGenerator.Application.DTOs;
using Microsoft.AspNetCore.Localization;
using System.Text.Encodings.Web;

namespace EnvelopeGenerator.Web.Controllers
{
    public class HomeController : BaseController
    {
        private readonly EnvelopeOldService envelopeOldService;
        private readonly IEnvelopeReceiverService _envRcvService;
        private readonly IEnvelopeHistoryService _historyService;
        private readonly IStringLocalizer<Resource> _localizer;
        private readonly IConfiguration _configuration;
        private readonly UrlEncoder _urlEncoder;

        public HomeController(DatabaseService databaseService, EnvelopeOldService envelopeOldService, ILogger<HomeController> logger, IEnvelopeReceiverService envelopeReceiverService, IEnvelopeHistoryService historyService, IStringLocalizer<Resource> localizer, IConfiguration configuration, UrlEncoder urlEncoder) : base(databaseService, logger)
        {
            this.envelopeOldService = envelopeOldService;
            _envRcvService = envelopeReceiverService;
            _historyService = historyService;
            _localizer = localizer;
            _configuration = configuration;
            _urlEncoder = urlEncoder;
        }
        
        [HttpGet("/EnvelopeKey/{envelopeReceiverId}")]
        public async Task<IActionResult> SendAccessCode([FromRoute] string envelopeReceiverId)
        {
            try
            {
                envelopeReceiverId = _urlEncoder.Encode(envelopeReceiverId);
                ViewData["EnvelopeKey"] = envelopeReceiverId;

                return await _envRcvService.ReadByEnvelopeReceiverIdAsync(envelopeReceiverId: envelopeReceiverId).ThenAsync<EnvelopeReceiverDto, IActionResult>(
                    SuccessAsync: async er =>
                    {
                        EnvelopeResponse response = await envelopeOldService.LoadEnvelope(envelopeReceiverId);

                        bool accessCodeAlreadyRequested = await _historyService.AccessCodeAlreadyRequested(envelopeId: er.Envelope!.Id, userReference: er.Receiver!.EmailAddress);
                        if (!accessCodeAlreadyRequested)
                        {
                            // Send email with password
                            bool actionResult = database.Services.actionService.RequestAccessCode(response.Envelope, response.Receiver);
                            bool result = database.Services.emailService.SendDocumentAccessCodeReceivedEmail(response.Envelope, response.Receiver);
                        }

                        return Redirect($"{envelopeReceiverId}/Locked");
                    },
                    Fail: (messages, notices) =>
                    {
                        _logger.LogNotice(notices);
                        return this.ViewEnvelopeNotFound();
                    });
            }
            catch(Exception ex)
            {
                _logger.LogEnvelopeError(envelopeEeceiverId: envelopeReceiverId, exception:ex, message: _localizer[MessageKey.UnexpectedError]);
                return this.ViewInnerServiceError();
            }
        }

        [HttpGet("EnvelopeKey/{envelopeReceiverId}/Locked")]
        public async Task<IActionResult> EnvelopeLocked([FromRoute] string envelopeReceiverId)
        {
            try
            {
                envelopeReceiverId = _urlEncoder.Encode(envelopeReceiverId);
                ViewData["Languages"] = _configuration.GetSection("Languages").Get<string[]>()!;
                ViewData["UserLanguage"] = UserLanguage;

                return await _envRcvService.IsExisting(envelopeReceiverId: envelopeReceiverId).ThenAsync(
                    Success: isExisting => isExisting ? View().WithData("EnvelopeKey", envelopeReceiverId) : this.ViewEnvelopeNotFound(),
                    Fail: IActionResult (messages,notices) =>
                    {
                        _logger.LogNotice(notices);
                        return this.ViewEnvelopeNotFound();
                    });
            }
            catch(Exception ex)
            {
                _logger.LogEnvelopeError(envelopeEeceiverId: envelopeReceiverId, exception: ex);
                return this.ViewInnerServiceError();
            }
        }

        [HttpPost("/EnvelopeKey/{envelopeReceiverId}/Locked")]
        public async Task<IActionResult> LogInEnvelope([FromRoute] string envelopeReceiverId, [FromForm] string access_code)
        {
            try
            {
                envelopeReceiverId = _urlEncoder.Encode(envelopeReceiverId);
                (string? uuid, string? signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();

                if(uuid is null || signature is null)
                {
                    _logger.LogEnvelopeError(uuid: uuid, signature: signature, message: _localizer[MessageKey.WrongEnvelopeReceiverId]);
                    return BadRequest(_localizer[MessageKey.WrongEnvelopeReceiverId]);
                }

                _logger.LogInformation($"Envelope UUID: [{uuid}]\nReceiver Signature: [{signature}]");

                return await _envRcvService.VerifyAccessCodeAsync(uuid: uuid, signature: signature, accessCode: access_code).ThenAsync(
                    SuccessAsync: async isVerified =>
                    {
                        EnvelopeResponse response = await envelopeOldService.LoadEnvelope(envelopeReceiverId);
                        if (isVerified)
                        {
                            //todo: write using crud-service (mostlikely history-service) to make it async
                            if (envelopeOldService.ReceiverAlreadySigned(response.Envelope, response.Receiver.Id))
                            {
                                return View("EnvelopeSigned");
                            }

                            database.Services.actionService.EnterCorrectAccessCode(response.Envelope, response.Receiver);   //for history
                            ViewData["EnvelopeKey"] = envelopeReceiverId;
                            ViewData["EnvelopeResponse"] = response;

                            return await _envRcvService.ReadByUuidSignatureAsync(uuid: uuid, signature: signature).ThenAsync<EnvelopeReceiverDto, IActionResult>(
                                    SuccessAsync: async er =>
                                    {
                                        if (response.Envelope.Documents.Count() > 0)
                                        {
                                            var document = await envelopeOldService.GetDocument(response.Envelope.Documents[0].Id, envelopeReceiverId);
                                            byte[] bytes = await envelopeOldService.GetDocumentContents(document);
                                            ViewData["DocumentBytes"] = bytes;
                                        }
                                        else
                                        {
                                            return this.ViewDocumentNotFound();
                                        }

                                        var claims = new List<Claim> { new(ClaimTypes.NameIdentifier, uuid), new(ClaimTypes.Hash, signature) };

                                        var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
                                        var authProperties = new AuthenticationProperties { };

                                        await HttpContext.SignInAsync(
                                            CookieAuthenticationDefaults.AuthenticationScheme,
                                            new ClaimsPrincipal(claimsIdentity),
                                            authProperties);

                                        //add PSPDFKit licence key
                                        ViewData["PSPDFKitLicenseKey"] = _configuration["PSPDFKitLicenseKey"];

                                        return View("ShowEnvelope", er);
                                    },
                                    Fail: (messages, notices) =>
                                    {
                                        _logger.LogNotice(notices);
                                        return this.ViewEnvelopeNotFound();
                                    }
                                );
                        }
                        else
                        {
                            database.Services.actionService.EnterIncorrectAccessCode(response.Envelope, response.Receiver); //for history
                            return Unauthorized();

                        }
                    },
                    Fail: (messages, notices) =>
                    {
                        _logger.LogNotice(notices);
                        return notices.HasFlag(Flag.SecurityBreach) ? Forbid() : StatusCode(StatusCodes.Status500InternalServerError, messages.Join());
                    });
            }
            catch(Exception ex)
            {
                _logger.LogEnvelopeError(envelopeEeceiverId: envelopeReceiverId, exception: ex);
                return this.ViewInnerServiceError();
            }
        }

        [HttpGet("/EnvelopeKey/{envelopeReceiverId}/Success")]
        public async Task<IActionResult> EnvelopeSigned(string envelopeReceiverId)
        {
            try
            {
                envelopeReceiverId = _urlEncoder.Encode(envelopeReceiverId);
                return await _envRcvService.IsExisting(envelopeReceiverId: envelopeReceiverId).ThenAsync(
                    SuccessAsync: async isExisting =>
                    {
                        if(!isExisting)
                            return this.ViewEnvelopeNotFound();

                        EnvelopeResponse response = await envelopeOldService.LoadEnvelope(envelopeReceiverId);
                        if (!envelopeOldService.ReceiverAlreadySigned(response.Envelope, response.Receiver.Id))
                            return Redirect($"/EnvelopeKey/{envelopeReceiverId}/Locked");

                        await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
                        ViewData["EnvelopeKey"] = envelopeReceiverId;
                        return View();
                    },
                    Fail: IActionResult (messages, notices) =>
                    {
                        _logger.LogNotice(notices);
                        return this.ViewEnvelopeNotFound();
                    });
            }
            catch (Exception ex)
            {
                _logger.LogEnvelopeError(envelopeEeceiverId: envelopeReceiverId, exception: ex);
                return this.ViewInnerServiceError();
            }
        }

        [Authorize]
        [HttpGet("IsAuthenticated")]
        public IActionResult IsAuthenticated()
        {
            var envelopeUuid = User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
            var receiverSignature = User.FindFirst(ClaimTypes.Hash)?.Value;
            return Ok(new { EnvelopeUuid = envelopeUuid, ReceiverSignature = receiverSignature });
        }

        [HttpGet("lang")]
        public IActionResult GetLanguage() => Ok(UserLanguage);

        [HttpPost("lang")]
        public IActionResult SetLanguage([FromForm] string language)
        {
            try
            {
                language = _urlEncoder.Encode(language);
                var cookieOptions = new CookieOptions()
                {
                    Expires = DateTimeOffset.UtcNow.AddYears(1),
                    Secure = false,
                    Path = "/",
                    SameSite = SameSiteMode.Strict,
                    HttpOnly = true
                };

                Response.Cookies.Append(
                    CookieRequestCultureProvider.DefaultCookieName,
                    CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(language)),
                    cookieOptions);

                return Redirect(Request.Headers["Referer"].ToString());
            }
            catch(Exception ex)
            {
                _logger.LogError(ex, ex.Message);
                return this.ViewEnvelopeNotFound();
            }
        }

        private string UserLanguage
        {
            get
            {
                return Request.Cookies[CookieRequestCultureProvider.DefaultCookieName] ?? _configuration.GetSection("Languages").Get<string[]>()![0];
            }
            set
            {
                Response.Cookies.Append(CookieRequestCultureProvider.DefaultCookieName, CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(value)), new CookieOptions()
                {
                    Expires = DateTimeOffset.UtcNow.AddYears(1),
                });
            }
        }

        public IActionResult Error404() => this.ViewError404();
    }
}