using System.Security.Authentication;
using System.Text.RegularExpressions;
using YandexMusic.API.Models.Account;
using YandexMusic.API.Requests.Account;

namespace YandexMusic.API;

/// <summary>API для работы с пользователем и авторизации.</summary>
public class YUserAPI : YCommonAPI
{
    public YUserAPI(YandexMusicApi api) : base(api) { }

    private async Task<bool> GetCsrfTokenAsync()
    {
        using var response = await new YGetAuthMethodsBuilder(Api).ExecuteRawAsync(null!);
        if (response == null || !response.IsSuccessStatusCode)
            throw new HttpRequestException("Не удалось получить CSRF-токен");

        var content = await response.Content.ReadAsStringAsync();
        var csrfMatch = Regex.Match(content, @"window\.__CSRF__\s*=\s*""([^""]+)""");
        var processMatch = Regex.Match(content, @"'process_uuid'\s*:\s*'([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})'");

        if (!csrfMatch.Success || !processMatch.Success)
            return false;

        Api.Storage.HeaderToken = new YAuthToken
        {
            CsfrToken = csrfMatch.Groups[1].Value,
            ProcessUuid = processMatch.Groups[1].Value
        };

        await new YPostAuthStats(Api).ExecuteAsync(null!);
        return true;
    }

    private async Task<bool> LoginByCookiesAsync()
    {
        if (Api.Storage.AuthToken == null)
            throw new AuthenticationException("Сессия входа не инициализирована");

        var accessToken = await new YGetAuthCookiesBuilder(Api).ExecuteAsync(null!);
        if (accessToken == null || string.IsNullOrEmpty(accessToken.AccessToken))
            return false;

        Api.Storage.AccessToken = accessToken;
        Api.Storage.Token = accessToken.AccessToken;

        await AuthorizeByPassportAsync(accessToken.AccessToken);

        return true;
    }

    public async Task AuthorizeAsync(string token)
    {
        if (string.IsNullOrEmpty(token))
            throw new Exception("Токен не может быть пустым");

        Api.Storage.Token = token;
        var authInfo = await new YGetAuthInfoBuilder(Api).ExecuteAsync(null!);
        if (authInfo?.Account?.Uid == null)
            throw new Exception("Пользователь не авторизован");

        Api.Storage.SetAuthorized(authInfo.Account, token);
    }

    public async Task AuthorizeByPassportAsync(string token)
    {
        if (string.IsNullOrEmpty(token))
            throw new Exception("Токен не может быть пустым");

        Api.Storage.Token = token;
        await GetAccessTokenAsync();
        await AuthorizeAsync(Api.Storage.Token);
    }

    public Task<YAccountResult?> GetUserAuthAsync()
        => new YGetAuthInfoBuilder(Api).ExecuteAsync(null!);

    public async Task<YAuthTypes?> CreateAuthSessionAsync(string userName)
    {
        if (!await GetCsrfTokenAsync())
            throw new Exception("Не удалось инициализировать сессию");

        var result = await new YGetAuthLoginUserBuilder(Api).ExecuteAsync((Api.Storage.AuthToken.CsfrToken, userName));
        if (result?.TrackId != null)
            Api.Storage.AuthToken.TrackId = result.TrackId;
        return result;
    }

    public async Task<string?> GetAuthQRLinkAsync()
    {
        if (!await GetCsrfTokenAsync())
            throw new Exception("Не удалось инициализировать сессию");

        var qr = await new YGetAuthQRBuilder(Api).ExecuteAsync(null!);
        if (qr?.Status != YAuthStatus.Ok || string.IsNullOrEmpty(qr.TrackId))
            return null;

        Api.Storage.AuthToken = new YAuthToken
        {
            TrackId = qr.TrackId,
            CsfrToken = qr.CsrfToken
        };
        return $"https://passport.yandex.ru/auth/magic/code/?track_id={qr.TrackId}";
    }

    public async Task<YAuthQRStatus?> CheckQRStatusAsync()
    {
        if (Api.Storage.AuthToken == null)
            throw new Exception("Сессия не инициализирована");

        var status = await new YPostQrStatus(Api).ExecuteAsync(null!);

        if (!string.IsNullOrWhiteSpace(status?.TrackId))
        {
            Api.Storage.AuthToken.SessionTrackId = status.TrackId;
        }

        return status;
    }

    public async Task<YAuthQRSession?> AuthorizeByQRAsync()
    {
        if (Api.Storage.AuthToken == null)
            throw new Exception("Сессия не инициализирована");

        if (string.IsNullOrWhiteSpace(Api.Storage.AuthToken.SessionTrackId))
            throw new Exception("Токен сессии не инициализирован");

        var status = await new YGetAuthLoginQRBuilder(Api).ExecuteAsync(null!);
        if (status != null && status.DefaultUid != 0 && await LoginByCookiesAsync())
            return status;
        throw new AuthenticationException("Ошибка авторизации по QR");
    }

    public Task<YAuthCaptcha?> GetCaptchaAsync()
    {
        if (Api.Storage.AuthToken == null)
            throw new AuthenticationException("Выполните CreateAuthSessionAsync перед использованием");
        return new YGetAuthCaptchaBuilder(Api).ExecuteAsync(null!);
    }

    public Task<YAuthBase?> AuthorizeByCaptchaAsync(string captchaValue)
    {
        if (Api.Storage.AuthToken == null)
            throw new AuthenticationException("Выполните CreateAuthSessionAsync перед использованием");
        return new YGetAuthLoginCaptchaBuilder(Api).ExecuteAsync(captchaValue);
    }

    public Task<YAuthLetter?> GetAuthLetterAsync()
        => new YGetAuthLetterBuilder(Api).ExecuteAsync(null!);

    public async Task<bool> AuthorizeByLetterAsync()
    {
        var status = await new YGetAuthLoginLetterBuilder(Api).ExecuteAsync(null!);
        if (status?.Status != YAuthStatus.Ok || !status.MagicLinkConfirmed)
            throw new Exception("Письмо не подтверждено");
        return await LoginByCookiesAsync();
    }

    public async Task<YAuthBase?> AuthorizeByAppPasswordAsync(string password)
    {
        if (Api.Storage.AuthToken == null)
            throw new AuthenticationException("Выполните CreateAuthSessionAsync перед использованием");

        var result = await new YGetAuthAppPasswordBuilder(Api).ExecuteAsync(password);
        if (result?.Status == YAuthStatus.Ok && await LoginByCookiesAsync())
            return result;
        throw new AuthenticationException("Ошибка авторизации по паролю");
    }

    public async Task<YAccessToken?> GetAccessTokenAsync()
    {
        if (Api.Storage.AuthToken == null)
            throw new Exception("Сессия не инициализована");

        var token = await new YGetMusicTokenBuilder(Api).ExecuteAsync(null!);
        if (token?.AccessToken != null)
            Api.Storage.Token = token.AccessToken;
        return token;
    }

    public Task<YLoginInfo?> GetLoginInfoAsync()
        => new YGetLoginInfoBuilder(Api).ExecuteAsync(null!);
}