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

import { scopedDirections } from '../user-trade-access/trade-scope.util';
import { ReportQueryDto } from './dto/report-query.dto';
import { REPORT_QUERIES, ReportFilters, ReportResult } from './report-queries';
import { ReportsRepository } from './reports.repository';
import type { Freight } from '@edr/types';

const DAY_MS = 24 * 60 * 60 * 1000;

const list = (csv?: string): string[] | null => {
  const items = csv?.split(',').map((s) => s.trim()).filter(Boolean) ?? [];
  return items.length ? items : null;
};

@Injectable()
export class ReportsService {
  constructor(private readonly repository: ReportsRepository) {}

  run(
    key: string,
    dto: ReportQueryDto,
    allowedDirections: Freight.ScheduleTradeDirection[] | null,
  ): Promise<ReportResult> {
    if (!(key in REPORT_QUERIES)) {
      throw new NotFoundException(`Unknown report: ${key}`);
    }
    // No default range: absent dates mean all time, so exports cover everything.
    const to = dto.dateTo ? new Date(dto.dateTo) : null;
    const from = dto.dateFrom ? new Date(dto.dateFrom) : null;
    const filters: ReportFilters = {
      dateFrom: from ? from.toISOString() : null,
      // dateTo is inclusive in the API; queries treat the bound as exclusive.
      dateTo: to ? new Date(to.getTime() + DAY_MS).toISOString() : null,
      granularity: dto.granularity ?? 'day',
      companyIds: list(dto.companyIds),
      routeIds: list(dto.routeIds),
      yardIds: list(dto.yardIds),
      cargoTypeIds: list(dto.cargoTypeIds),
      statuses: list(dto.statuses),
      directions: scopedDirections(allowedDirections, dto.direction),
      freightType: dto.freightType ?? null,
    };
    return this.repository.run(key, filters);
  }
}