import { Injectable } from '@nestjs/common';
import { InjectEntityManager, InjectRepository } from '@nestjs/typeorm';
import { ContractEntity } from './contract.entity';
import { EntityManager, Like, Not, Repository } from 'typeorm';
import { ContractDto, ContractQueryDto, ContractUpdateDto } from './contract.dto';
import { Pagination } from '~/helper/paginate/pagination';
import { isNumber } from 'lodash';
import { paginate } from '~/helper/paginate';
import { Storage } from '../tools/storage/storage.entity';
import { BusinessException } from '~/common/exceptions/biz.exception';
import { ErrorEnum } from '~/constants/error-code.constant';
import { fieldSearch } from '~/shared/database/field-search';

@Injectable()
export class ContractService {
  constructor(
    @InjectEntityManager() private entityManager: EntityManager,
    @InjectRepository(ContractEntity)
    private contractRepository: Repository<ContractEntity>,
    @InjectRepository(Storage)
    private storageRepository: Repository<Storage>
  ) {}

  /**
   * 查找所有合同
   */
  async findAll({
    page,
    pageSize,
    ...fields
  }: ContractQueryDto): Promise<Pagination<ContractEntity>> {
    const queryBuilder = this.contractRepository
      .createQueryBuilder('contract')
      .leftJoin('contract.files', 'files')
      .addSelect(['files.id', 'files.path'])
      .where(fieldSearch(fields))
      .andWhere('contract.isDelete = 0');

    return paginate<ContractEntity>(queryBuilder, {
      page,
      pageSize
    });
  }

  /**
   * 新增
   */
  async create({ contractNumber, ...ext }: ContractDto): Promise<void> {
    if (await this.checkIsContractNumberExsit(contractNumber)) {
      throw new BusinessException(ErrorEnum.CONTRACT_NUMBER_EXIST);
    }
    await this.contractRepository.insert(
      this.contractRepository.create({ contractNumber, ...ext })
    );
  }

  /**
   * 更新
   */
  async update(
    id: number,
    { fileIds, contractNumber, ...ext }: Partial<ContractUpdateDto>
  ): Promise<void> {
    await this.entityManager.transaction(async manager => {
      if (contractNumber && (await this.checkIsContractNumberExsit(contractNumber, id))) {
        throw new BusinessException(ErrorEnum.CONTRACT_NUMBER_EXIST);
      }
      await manager.update(ContractEntity, id, {
        ...ext,
        contractNumber
      });

      if (fileIds?.length) {
        const count = await this.storageRepository
          .createQueryBuilder('storage')
          .where('storage.id in(:fileIds)', { fileIds })
          .getCount();
        if (count !== fileIds?.length) {
          throw new BusinessException(ErrorEnum.STORAGE_NOT_FOUND);
        }
        // 附件要批量插入
        await manager.createQueryBuilder().relation(ContractEntity, 'files').of(id).add(fileIds);
      }
    });
  }

  /**
   * 是否存在相同编号的合同
   * @param contractNumber 合同编号
   */
  async checkIsContractNumberExsit(contractNumber: string, id?: number): Promise<Boolean> {
    return !!(await this.contractRepository.findOne({
      where: {
        contractNumber: contractNumber,
        id: Not(id)
      }
    }));
  }
  /**
   * 删除
   */
  async delete(id: number): Promise<void> {
    // 合同比较重要，做逻辑删除
    await this.contractRepository.update(id, { isDelete: 1 });
  }

  /**
   * 获取单个合同信息
   */
  async info(id: number) {
    const info = await this.contractRepository
      .createQueryBuilder('contract')
      .where({
        id
      })
      .andWhere('contract.isDelete = 0')
      .getOne();
    return info;
  }

  /**
   * 解除附件关联
   * @param id 合同ID
   * @param fileIds 附件ID
   */
  async unlinkAttachments(id: number, fileIds: number[]) {
    await this.entityManager.transaction(async manager => {
      const contract = await this.contractRepository
        .createQueryBuilder('contract')
        .leftJoinAndSelect('contract.files', 'files')
        .where('contract.id = :id', { id })
        .getOne();
      const linkedFiles = contract.files
        .map(item => item.id)
        .filter(item => !fileIds.includes(item));
      // 附件要批量更新
      await manager
        .createQueryBuilder()
        .relation(ContractEntity, 'files')
        .of(id)
        .addAndRemove(linkedFiles, contract.files);
    });
  }
}