import {
  OnModuleInit,
  Inject,
  Injectable,
  ForbiddenException,
  UnauthorizedException,
} from '@nestjs/common';
import { ClientGrpc } from '@nestjs/microservices';
import { DadosferaLogger } from '@dadosfera/dadosfera-logs';
import { lastValueFrom } from 'rxjs';

import { ProtoServices } from '@dadosfera/protospack-v2/dist/lib/Duc';
import {
  AuthProtoService as AuthServiceInterface,
  IdentityProviderProtoService,
  UsersProtoService,
} from '@dadosfera/protospack-v2/dist/lib/Duc/interfaces/write-service';
import {
  AuthSnowflakeSignInRequest,
  AuthSignInRequest,
  AuthRefreshAccessTokenRequest,
  AuthEnableTotpMfaRequest,
  AuthDisableTotpMfaRequest,
  AuthDismissTotpMfaRequest,
  AuthVerifyTotpMfaRequest,
  AuthChangePasswordRequest,
  AuthResetPasswordRequest,
  AuthVerifyResetPasswordCodeRequest,
  AuthConfirmResetPasswordRequest,
  AuthSignInResponse,
} from '@dadosfera/protospack-v2/dist/lib/Duc/interfaces/messages';
import { DucClient } from '../duc/client.config';
import { Metadata } from '@grpc/grpc-js';
import { BulkEditResponse, UserDTO } from './dtos/login';
import jwt, { JwtPayload } from 'jsonwebtoken';
import { PackTheMetadata } from 'src/utils/PackTheMetadata';
import { Request, Response } from 'express';

type AuthSession = {
  accessToken?: string;
  refreshToken?: string;
  userId?: string;
};

@Injectable()
export class AuthClientService implements OnModuleInit {
  logger: DadosferaLogger;

  private authService: AuthServiceInterface;
  private userService: UsersProtoService;

  constructor(
    @Inject(DadosferaLogger)
    dadosferaLogger: DadosferaLogger,
    @Inject(DucClient.name) private readonly grpcClient: ClientGrpc,
  ) {
    this.logger = dadosferaLogger.logger;
  }

  onModuleInit() {
    this.authService = this.grpcClient.getService<AuthServiceInterface>(
      ProtoServices.AuthProtoService,
    );

    this.userService = this.grpcClient.getService<UsersProtoService>(
      ProtoServices.UsersProtoService,
    );
  }

  async getPublicKeys() {
    this.logger.info('GetPublicKeys');

    return lastValueFrom(this.authService.AuthGetPublicKeys({}));
  }

  async snowflakeSignIn(input: AuthSnowflakeSignInRequest) {
    this.logger.info('snowflakeSignIn');

    return lastValueFrom(this.authService.AuthSnowflakeSignIn(input));
  }

  checkDedicatedProxy({ customer }: AuthSignInResponse) {
    const DEDICATED_PROXY = process.env.DEDICATED_PROXY || '';
    this.logger.info(
      'SignIn - Setting customer ID for dedicated proxy: ' + DEDICATED_PROXY,
    );
    this.logger.info('Customer ID: ' + customer.id);

    if (DEDICATED_PROXY !== '' && DEDICATED_PROXY !== customer.id) {
      throw new ForbiddenException();
    }

    // Bloquear o customer de acesso o maestro publico
    this.logger.info(
      'Check if customer have network policy: ' + customer.modules,
    );
    const hasNetworkPolicyModule = customer.modules.includes('network-policy');
    if (hasNetworkPolicyModule && DEDICATED_PROXY === '') {
      throw new ForbiddenException();
    }
  }

  async signIn(
    { username, password, totp }: AuthSignInRequest,
    metadata: Metadata,
  ) {
    this.logger.info('SignIn');

    let result: AuthSignInResponse;

    try {
      result = await lastValueFrom(
        this.authService.AuthSignIn({ username, password, totp }, metadata),
      );
    } catch (error) {
      this.logger.error('SignIn - Error during sign-in');
      this.logger.error(error);
      throw error;
    }

    if (result.customer) {
      this.checkDedicatedProxy(result);
    }

    return result;
  }

  async refreshAccessToken(
    { refreshToken, userId }: AuthRefreshAccessTokenRequest,
    metadata: Metadata,
  ) {
    this.logger.info('RefreshAccessToken');

    return lastValueFrom(
      this.authService.AuthRefreshAccessToken(
        { refreshToken, userId },
        metadata,
      ),
    );
  }

  async changePassword({
    accessToken,
    oldPassword,
    newPassword,
  }: AuthChangePasswordRequest) {
    this.logger.info('ChangePassword');

    return lastValueFrom(
      this.authService.AuthChangePassword({
        accessToken,
        oldPassword,
        newPassword,
      }),
    );
  }

  async resetPassword(
    { username }: AuthResetPasswordRequest,
    metadata: Metadata,
  ) {
    this.logger.info('resetPassword');

    return lastValueFrom(
      this.authService.AuthResetPassword({ username }, metadata),
    );
  }

  async verifyResetPasswordCode({
    username,
    code,
  }: AuthVerifyResetPasswordCodeRequest) {
    this.logger.info('verifyResetPasswordCode');

    return lastValueFrom(
      this.authService.AuthVerifyResetPasswordCode({ username, code }),
    );
  }

  async confirmResetPassword(
    { username, code, newPassword }: AuthConfirmResetPasswordRequest,
    metadata: Metadata,
  ) {
    this.logger.info('confirmResetPassword');

    return lastValueFrom(
      this.authService.AuthConfirmResetPassword(
        {
          username,
          code,
          newPassword,
        },
        metadata,
      ),
    );
  }

  async enableTotpMFA({ accessToken, password }: AuthEnableTotpMfaRequest) {
    this.logger.info('enableTotpMFA');

    return lastValueFrom(
      this.authService.AuthEnableTotpMfa({ accessToken, password }),
    );
  }

  async disableTotpMFA({ accessToken, password }: AuthDisableTotpMfaRequest) {
    this.logger.info('disableTotpMFA');

    return lastValueFrom(
      this.authService.AuthDisableTotpMfa({ accessToken, password }),
    );
  }

  async dismissTotpMFA({ accessToken }: AuthDismissTotpMfaRequest) {
    this.logger.info('dismissTotpMFA');

    return lastValueFrom(this.authService.AuthDismissTotpMfa({ accessToken }));
  }

  async verifyTotp({ accessToken, totp }: AuthVerifyTotpMfaRequest) {
    this.logger.info('disableTotpMFA');

    return lastValueFrom(
      this.authService.AuthVerifyTotpMfa({ accessToken, totp }),
    );
  }

  async getSession(session: string) {
    return lastValueFrom(this.authService.AuthGetSession({ session }));
  }

  async oauthSignIn(data: { username: string; token: string }) {
    const { username, token } = data;
    return lastValueFrom(
      this.authService.AuthOauthSignIn({ token, username, refreshToken: '' }),
    );
  }

  async blockUsers(
    users: string[],
    metadata: Metadata,
  ): Promise<BulkEditResponse> {
    this.logger.info('blockUsers - Service starting');

    try {
      this.logger.debug('Calling BlockUser gRPC method', {
        metadata: {
          access_token: metadata.get('access_token'),
          language: metadata.get('language'),
        },
      });

      const response = await lastValueFrom<BulkEditResponse>(
        this.authService.BlockUser({ users }, metadata),
      );

      this.logger.info('blockUsers - Service success', { response });
      return response;
    } catch (error) {
      this.logger.error('blockUsers - Service error', {
        error: error.message,
        stack: error.stack,
      });
      throw error;
    }
  }

  async unblockUsers(
    users: string[],
    metadata: Metadata,
  ): Promise<BulkEditResponse> {
    this.logger.info('unblockUsers');
    return await lastValueFrom(
      this.authService.UnblockUser({ users }, metadata),
    );
  }

  async resetUsers(
    users: string[],
    metadata: Metadata,
  ): Promise<BulkEditResponse> {
    this.logger.info('resetUsers');

    try {
      this.logger.debug('Calling ResetUser gRPC method', {
        metadata: {
          access_token: metadata.get('access_token'),
          language: metadata.get('language'),
        },
      });

      const response = await lastValueFrom<BulkEditResponse>(
        this.authService.ResetUser({ users }, metadata),
      );

      this.logger.info('resetUsers - Success', { response });
      return response;
    } catch (error) {
      this.logger.error('resetUsers - Error', {
        error: error.message,
        stack: error.stack,
      });
      throw error;
    }
  }

  public async validateUserSession(accessToken: any, originHeader: string) {
    const payload = await this.validateJwtToken(accessToken);

    const userDto = await this.getUserfromPayload(payload);

    this.validateResourceAccess(originHeader, userDto);
    return userDto;
  }

  public async refreshUserSession(
    refreshToken: string,
    userId: string,
    originHeader: string,
  ): Promise<{
    user: UserDTO;
    authSession: AuthSession;
  }> {
    const metadata = PackTheMetadata({});

    this.logger.info('Call Refresh Token');
    const refreshCredentials = await this.refreshAccessToken(
      { refreshToken, userId },
      metadata,
    );
    this.logger.info('Finish Refresh Token');

    const userDto = await this.validateUserSession(
      refreshCredentials.accessToken,
      originHeader,
    );
    return {
      user: userDto,
      authSession: {
        accessToken: refreshCredentials.accessToken,
        refreshToken: refreshCredentials.refreshToken,
        userId,
      },
    };
  }

  public writeAuthSession(res: Response, data: AuthSession) {
    let exp = 1000 * 60 * 5; // 5 minutes

    if (data.accessToken) {
      const { exp: expiration } = jwt.decode(data.accessToken) as JwtPayload;
      exp = (expiration - 30) * 1000; // exp em segundos, maxAge em ms

      this.logger.info('Set Cookie ddf-auth');
      res.cookie('ddf-auth', data.accessToken, {
        domain: '.dadosfera.ai',
        maxAge: exp,
        httpOnly: true,
        secure: true,
        sameSite: 'none', // Necessário para cookies em requisições cross-site
      });
    }

    if (data.refreshToken) {
      this.logger.info('Set Cookie ddf-refresh-auth');
      res.cookie('ddf-refresh-auth', data.refreshToken, {
        domain: '.dadosfera.ai',
        maxAge: exp,
        httpOnly: true,
        secure: true,
        sameSite: 'none', // Necessário para cookies em requisições cross-site
      });
    }

    if (data.userId) {
      this.logger.info('Set Cookie ddf-refresh-auth');
      res.cookie('ddf-user-id', data.userId, {
        domain: '.dadosfera.ai',
        maxAge: exp,
        httpOnly: true,
        secure: true,
        sameSite: 'none', // Necessário para cookies em requisições cross-site
      });
    }
  }

  public cleanUpAuthSession(res: Response) {
    const exp = 1000 * 60 * 3;

    res.cookie('ddf-auth', '', {
      domain: 'dadosfera.ai',
      maxAge: Date.now() - exp,
      expires: new Date(),
      httpOnly: true,
      secure: true,
      sameSite: 'none', // Necessário para cookies em requisições cross-site
    });

    res.cookie('ddf-refresh-auth', '', {
      domain: 'dadosfera.ai',
      maxAge: Date.now() - exp,
      expires: new Date(),
      httpOnly: true,
      secure: true,
      sameSite: 'none', // Necessário para cookies em requisições cross-site
    });

    this.logger.info('Clean cookie sessions');
  }

  private async validateJwtToken(token: string) {
    const decoded: any = token && jwt.decode(token, { complete: true });
    if (!decoded) throw new Error('Invalid token');

    const { kid } = decoded.header;
    // Busca a chave pública
    const { keys } = await this.getPublicKeys();
    const pemValue = keys.find((k) => k.kid === kid)?.pem;
    if (!pemValue) throw new Error('Public key not found');
    jwt.verify(token, pemValue);

    return decoded.payload;
  }

  private async getUserfromPayload(payload: JwtPayload): Promise<UserDTO> {
    this.logger.info('getUser');

    const metadata = PackTheMetadata({
      customer_id: payload.customer_id,
    });

    const { user } = await lastValueFrom(
      this.userService.UserFindOneById({ id: payload.user_id }, metadata),
    );

    const userDto: UserDTO = {
      id: user.id,
      name: user.username,
      jobTitle: user?.jobTitle || null,
      department: user?.department || null,
      hierarchy: user?.hierarchy || null,
      customer: {
        id: payload.customer_id,
        name: payload.customer_name,
        tier: payload.customer_tier,
      },
    };

    return userDto;
  }

  private validateResourceAccess(host: string, user: UserDTO) {
    this.logger.info(
      "Validate whether the source URL is a resource belonging to the user's client",
    );
    this.logger.info('Host: ' + host);
    this.logger.info('Customer: ' + user.customer.name);

    const hostParts = host.split('.');
    const domain = hostParts[0];
    const isResouceStg = hostParts[1] === 'stg';

    const domainParts = domain.split('-');
    const customerInDomain = domainParts[domainParts.length - 1];

    if (isResouceStg && process.env.ENV !== 'stg') {
      throw new ForbiddenException(
        `Customer ${user.customer.name} cannot access ${origin}`,
      );
    }

    if (customerInDomain != user.customer.name) {
      throw new ForbiddenException(
        `Customer ${user.customer.name} cannot access ${origin}`,
      );
    }

    return;
  }
}