import { Injectable, NotFoundException } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';

import { v4 } from 'uuid';
import { Repository } from 'typeorm';

import { TypeORMService } from 'src/database/typeorm/typeorm.service';
import { CreateRemoteServerInput } from 'src/engine/metadata-modules/remote-server/dtos/create-remote-server.input';
import {
  RemoteServerEntity,
  RemoteServerType,
} from 'src/engine/metadata-modules/remote-server/remote-server.entity';
import { EnvironmentService } from 'src/engine/integrations/environment/environment.service';
import { encryptText } from 'src/engine/core-modules/auth/auth.util';
import {
  validateObject,
  validateString,
} from 'src/engine/metadata-modules/remote-server/utils/validate-remote-server-input';
import { ForeignDataWrapperQueryFactory } from 'src/engine/api/graphql/workspace-query-builder/factories/foreign-data-wrapper-query.factory';

@Injectable()
export class RemoteServerService<T extends RemoteServerType> {
  constructor(
    @InjectRepository(RemoteServerEntity, 'metadata')
    private readonly remoteServerRepository: Repository<
      RemoteServerEntity<RemoteServerType>
    >,
    private readonly typeORMService: TypeORMService,
    private readonly environmentService: EnvironmentService,
    private readonly foreignDataWrapperQueryFactory: ForeignDataWrapperQueryFactory,
  ) {}

  async createOneRemoteServer(
    remoteServerInput: CreateRemoteServerInput<T>,
    workspaceId: string,
  ): Promise<RemoteServerEntity<RemoteServerType>> {
    validateObject(remoteServerInput.foreignDataWrapperOptions);

    if (remoteServerInput.userMappingOptions) {
      validateObject(remoteServerInput.userMappingOptions);
    }

    const mainDatasource = this.typeORMService.getMainDataSource();
    const foreignDataWrapperId = v4();

    let remoteServerToCreate = {
      ...remoteServerInput,
      workspaceId,
      foreignDataWrapperId,
    };

    if (remoteServerInput.userMappingOptions) {
      const key = this.environmentService.get('LOGIN_TOKEN_SECRET');
      const encryptedPassword = await encryptText(
        remoteServerInput.userMappingOptions.password,
        key,
        // TODO: check if we should use a separated IV
        key,
      );

      remoteServerToCreate = {
        ...remoteServerToCreate,
        userMappingOptions: {
          ...remoteServerInput.userMappingOptions,
          password: encryptedPassword,
        },
      };
    }

    const createdRemoteServer =
      await this.remoteServerRepository.create(remoteServerToCreate);

    const foreignDataWrapperQuery =
      this.foreignDataWrapperQueryFactory.createForeignDataWrapper(
        createdRemoteServer.foreignDataWrapperId,
        remoteServerInput.foreignDataWrapperType,
        remoteServerInput.foreignDataWrapperOptions,
      );

    await mainDatasource.query(foreignDataWrapperQuery);

    if (remoteServerInput.userMappingOptions) {
      const userMappingQuery =
        this.foreignDataWrapperQueryFactory.createUserMapping(
          createdRemoteServer.foreignDataWrapperId,
          remoteServerInput.userMappingOptions,
        );

      await mainDatasource.query(userMappingQuery);
    }

    await this.remoteServerRepository.save(createdRemoteServer);

    return createdRemoteServer;
  }

  async deleteOneRemoteServer(
    id: string,
    workspaceId: string,
  ): Promise<RemoteServerEntity<RemoteServerType>> {
    validateString(id);

    const remoteServer = await this.remoteServerRepository.findOne({
      where: {
        id,
        workspaceId,
      },
    });

    if (!remoteServer) {
      throw new NotFoundException('Object does not exist');
    }

    const mainDatasource = this.typeORMService.getMainDataSource();

    await mainDatasource.query(
      `DROP SERVER "${remoteServer.foreignDataWrapperId}" CASCADE`,
    );
    await this.remoteServerRepository.delete(id);

    return remoteServer;
  }

  public async findOneByIdWithinWorkspace(id: string, workspaceId: string) {
    return this.remoteServerRepository.findOne({
      where: {
        id,
        workspaceId,
      },
    });
  }

  public async findManyByTypeWithinWorkspace<T extends RemoteServerType>(
    foreignDataWrapperType: T,
    workspaceId: string,
  ) {
    return this.remoteServerRepository.find({
      where: {
        foreignDataWrapperType,
        workspaceId,
      },
    });
  }
}