backend/src/occupancy/services/occupancy.service.ts

import { HttpException, HttpStatus, Injectable } from '@nestjs/common';
import { GetOccupancyHeatMapBySpaceDto } from '../dto/get-occupancy.dto';
import { SuccessResponseDto } from '@app/common/dto/success.response.dto';
import { SpaceParamsDto } from '../dto/occupancy-params.dto';
import { SqlLoaderService } from '@app/common/helper/services/sql-loader.service';
import { DataSource } from 'typeorm';
import { SQL_PROCEDURES_PATH } from '@app/common/constants/sql-query-path';
import { BaseResponseDto } from '@app/common/dto/base.response.dto';

@Injectable()
export class OccupancyService {
  constructor(
    private readonly sqlLoader: SqlLoaderService,
    private readonly dataSource: DataSource,
  ) {}

  async getOccupancyHeatMapDataBySpace(
    params: SpaceParamsDto,
    query: GetOccupancyHeatMapBySpaceDto,
  ): Promise<BaseResponseDto> {
    const { year } = query;
    const { spaceUuid } = params;

    try {
      const data = await this.executeProcedure(
        'proceduce_select_fact_space_occupancy',
        [spaceUuid, year],
      );
      const formattedData = data.map((item) => ({
        ...item,
        event_date: new Date(item.event_date).toLocaleDateString('en-CA'), // YYYY-MM-DD
      }));
      return this.buildResponse(
        `Occupancy heat map data fetched successfully for ${spaceUuid ? 'space' : 'community'}`,
        formattedData,
      );
    } catch (error) {
      console.error('Failed to fetch occupancy heat map data', {
        error,
        spaceUuid,
      });
      throw new HttpException(
        error.response?.message || 'Failed to fetch occupancy heat map data',
        error.status || HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }

  private buildResponse(message: string, data: any[]) {
    return new SuccessResponseDto({
      message,
      data,
      statusCode: HttpStatus.OK,
    });
  }
  private async executeProcedure(
    procedureFileName: string,
    params: (string | number | null)[],
  ): Promise<any[]> {
    const query = this.loadQuery(
      'fact_space_occupancy_count',
      procedureFileName,
    );
    return await this.dataSource.query(query, params);
  }
  private loadQuery(folderName: string, fileName: string): string {
    return this.sqlLoader.loadQuery(folderName, fileName, SQL_PROCEDURES_PATH);
  }
}