import { GetUnitChildDto } from '../dtos/get.unit.dto';
import { SpaceTypeRepository } from '../../../libs/common/src/modules/space-type/repositories/space.type.repository';
import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
import { SpaceRepository } from '@app/common/modules/space/repositories';
import { AddUnitDto } from '../dtos';
import {
  UnitChildInterface,
  UnitParentInterface,
  GetUnitByUuidInterface,
} from '../interface/unit.interface';
import { SpaceEntity } from '@app/common/modules/space/entities';

@Injectable()
export class UnitService {
  constructor(
    private readonly spaceRepository: SpaceRepository,
    private readonly spaceTypeRepository: SpaceTypeRepository,
  ) {}

  async addUnit(addUnitDto: AddUnitDto) {
    try {
      const spaceType = await this.spaceTypeRepository.findOne({
        where: {
          type: 'unit',
        },
      });

      await this.spaceRepository.save({
        spaceName: addUnitDto.unitName,
        parent: { uuid: addUnitDto.floorUuid },
        spaceType: { uuid: spaceType.uuid },
      });
    } catch (err) {
      throw new HttpException(err.message, HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

  async getUnitByUuid(unitUuid: string): Promise<GetUnitByUuidInterface> {
    try {
      const unit = await this.spaceRepository.findOne({
        where: {
          uuid: unitUuid,
          spaceType: {
            type: 'unit',
          },
        },
        relations: ['spaceType'],
      });
      if (!unit) {
        throw new HttpException('Unit not found', HttpStatus.NOT_FOUND);
      }
      return {
        uuid: unit.uuid,
        createdAt: unit.createdAt,
        updatedAt: unit.updatedAt,
        name: unit.spaceName,
        type: unit.spaceType.type,
      };
    } catch (err) {
      throw new HttpException(
        err.message,
        err.status || HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }
  async getUnitChildByUuid(
    unitUuid: string,
    getUnitChildDto: GetUnitChildDto,
  ): Promise<UnitChildInterface> {
    const { includeSubSpaces, page, pageSize } = getUnitChildDto;

    const space = await this.spaceRepository.findOneOrFail({
      where: { uuid: unitUuid },
      relations: ['children', 'spaceType'],
    });

    if (space.spaceType.type !== 'unit') {
      throw new HttpException('Unit not found', HttpStatus.NOT_FOUND);
    }

    const totalCount = await this.spaceRepository.count({
      where: { parent: { uuid: space.uuid } },
    });

    const children = await this.buildHierarchy(
      space,
      includeSubSpaces,
      page,
      pageSize,
    );

    return {
      uuid: space.uuid,
      name: space.spaceName,
      type: space.spaceType.type,
      totalCount,
      children,
    };
  }

  private async buildHierarchy(
    space: SpaceEntity,
    includeSubSpaces: boolean,
    page: number,
    pageSize: number,
  ): Promise<UnitChildInterface[]> {
    const children = await this.spaceRepository.find({
      where: { parent: { uuid: space.uuid } },
      relations: ['spaceType'],
      skip: (page - 1) * pageSize,
      take: pageSize,
    });

    if (!children || children.length === 0 || !includeSubSpaces) {
      return children
        .filter(
          (child) =>
            child.spaceType.type !== 'unit' &&
            child.spaceType.type !== 'floor' &&
            child.spaceType.type !== 'community',
        ) // Filter remaining unit and floor and community types
        .map((child) => ({
          uuid: child.uuid,
          name: child.spaceName,
          type: child.spaceType.type,
        }));
    }

    const childHierarchies = await Promise.all(
      children
        .filter(
          (child) =>
            child.spaceType.type !== 'unit' &&
            child.spaceType.type !== 'floor' &&
            child.spaceType.type !== 'community',
        ) // Filter remaining unit and floor and community types
        .map(async (child) => ({
          uuid: child.uuid,
          name: child.spaceName,
          type: child.spaceType.type,
          children: await this.buildHierarchy(child, true, 1, pageSize),
        })),
    );

    return childHierarchies;
  }

  async getUnitParentByUuid(unitUuid: string): Promise<UnitParentInterface> {
    try {
      const unit = await this.spaceRepository.findOne({
        where: {
          uuid: unitUuid,
          spaceType: {
            type: 'unit',
          },
        },
        relations: ['spaceType', 'parent', 'parent.spaceType'],
      });
      if (!unit) {
        throw new HttpException('Unit not found', HttpStatus.NOT_FOUND);
      }

      return {
        uuid: unit.uuid,
        name: unit.spaceName,
        type: unit.spaceType.type,
        parent: {
          uuid: unit.parent.uuid,
          name: unit.parent.spaceName,
          type: unit.parent.spaceType.type,
        },
      };
    } catch (err) {
      throw new HttpException(
        err.message,
        err.status || HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }
}