using System.Text;
using System.Text.Json;
using JOBot.Backend.DAL.Context;
using JOBot.Backend.DTOs.HeadHunterHook;
using JOBot.Backend.Infrastructure.Config;
using JOBot.Infrastructure.Config;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using RabbitMQ.Client;

namespace JOBot.Backend.Services;

public class HeadHunterService(
    IChannel channel,
    ILogger<HeadHunterService> logger,
    IOptions<HeadHunterConfig> config,
    IWebHostEnvironment env,
    AppDbContext dbContext)
{
    public enum Status
    {
        UserAuthRejectedError,
        HeadHunterAuthRejectedError,
        UserNotFoundError,
        HeadHunterResponseDeserializationFailedError,
        Success
    }

    private readonly HeadHunterConfig _config = config.Value;

    /// <summary>
    ///     Generate HeadHunter oauth authorization link
    /// </summary>
    /// <param name="userId">Telegram UserId</param>
    /// <returns>Link for auth</returns>
    public string GenerateAuthLink(long userId)
    {
        return string.Format(_config.Links.AuthLink, [_config.ClientId, GetRedirectUrl(userId)]);
    }

    public async Task<Status> AuthUser(int userId, string authorizationCode, string? error) //TODO: Разбить этот метод
    {
        logger.LogInformation($"Authorization for user {userId} in process...");

        if (!string.IsNullOrEmpty(error))
        {
            logger.LogWarning($"User {userId} auth completed with error {error}");
            return Status.UserAuthRejectedError;
        }

        HeadHunterTokenResponseDto? responseDto;
        if (!env.IsDevelopment()) //Production server
        {
            using var client = new HttpClient();
            var form = new Dictionary<string, string>
            {
                { "client_id", _config.ClientId },
                { "client_secret", _config.Secret },
                { "code", authorizationCode },
                { "grant_type", "authorization_code" },
                { "redirect_uri", GetRedirectUrl(userId) }
            };
            client.BaseAddress = new UriBuilder(_config.Links.HeadHunterApiDomain)
            {
                Port = -1,
                Scheme = "https"
            }.Uri;
            client.DefaultRequestHeaders.UserAgent.ParseAdd("Jobot BackEnd Service");

            using var res = await client.SendAsync(
                new HttpRequestMessage(
                    HttpMethod.Post,
                    _config.Links.HeadHunterTokenRoute)
                {
                    Content = new FormUrlEncodedContent(form)
                });

            if (!res.IsSuccessStatusCode)
            {
                logger.LogWarning($"Response of HttpRequest {_config.Links.HeadHunterApiDomain}" +
                                  $"{_config.Links.HeadHunterTokenRoute} has unsuccessful status code {res.StatusCode}");
                logger.LogWarning($"{res.Content.ReadAsStringAsync().Result}");
                return Status.HeadHunterAuthRejectedError;
            }

            responseDto =
                JsonSerializer.Deserialize<HeadHunterTokenResponseDto>(await res.Content.ReadAsStringAsync());

            if (responseDto == null)
            {
                logger.LogWarning($"User {userId} auth completed with error " +
                                  $"{nameof(Status.HeadHunterResponseDeserializationFailedError)}");
                return Status.HeadHunterResponseDeserializationFailedError;
            }
        }
        else
        {
            responseDto = new HeadHunterTokenResponseDto("testtoken", 0, "testtoken", "--");
        }

        var user = await dbContext.Users.FirstOrDefaultAsync(x => x.UserId == userId);

        if (user == null)
        {
            logger.LogWarning($"User {userId} search completed with error {nameof(Status.UserNotFoundError)}");
            return Status.UserNotFoundError;
        }

        user.AccessToken = responseDto.AccessToken;
        user.RefreshToken = responseDto.RefreshToken;

        await dbContext.SaveChangesAsync();

        logger.LogInformation($"User {userId} auth completed!");

        await channel.BasicPublishAsync(
            string.Empty,
            RabbitQueues.AuthQueue,
            Encoding.UTF8.GetBytes(userId.ToString()));

        logger.LogInformation("RabbitMQ event was created");

        return Status.Success;
    }

    private string GetRedirectUrl(long userId)
    {
        return new UriBuilder(_config.Links.HookDomain)
        {
            Port = -1,
            Scheme = "https",
            Path = _config.Links.HookRoute,
            Query = $"?userId={userId}"
        }.ToString();
    }
}