// import { Injectable, NotFoundException } from "@nestjs/common";
// import { PrismaService } from "src/prisma/prisma.service";
// import { NotificationsService } from "src/modules/notifications/services/notifications.service";
// import { computeHours } from "src/common/utils/date-utils";
// import { OverviewRow } from "../types-and-interfaces/shifts-overview-row.interface";

// // const DAILY_LIMIT_HOURS = Number(process.env.DAILY_LIMIT_HOURS ?? 12);

// @Injectable()
// export class ShiftsQueryService {
//     constructor(
//         private readonly prisma: PrismaService,
//         private readonly notifs: NotificationsService,
//     ) {}

//     async getSummary(period_id: number): Promise<OverviewRow[]> {
//         //fetch pay-period to display
//         const period = await this.prisma.payPeriods.findFirst({
//             where: { pay_period_no: period_id }, 
//         });
//         if(!period) {
//             throw new NotFoundException(`pay-period ${period_id} not found`);
//         }
//         const { period_start, period_end } = period;

//         //prepare shifts and expenses for display 
//         const shifts = await this.prisma.shifts.findMany({
//             where: { date: { gte: period_start, lte: period_end } },
//             include: { 
//                 bank_code: true,
//                 timesheet: { include: { 
//                                 employee: { include: { 
//                                                 user:true,
//                                                 supervisor: { include: { user: true } },
//                                 } },
//                 } },
//             },
//         });

//         const expenses = await this.prisma.expenses.findMany({
//             where: { date: { gte: period_start, lte: period_end } },
//             include: { 
//                 bank_code: true,
//                 timesheet: { include: { employee: {
//                                             include: { user:true,
//                                                         supervisor: { include: { user:true } },
//                                         } }, 
//                 } },
//             },
//         });

//         const mapRow = new Map<string, OverviewRow>();

//         for(const shift of shifts) {
//             const employeeId = shift.timesheet.employee.user_id;
//             const user = shift.timesheet.employee.user;
//             const sup = shift.timesheet.employee.supervisor?.user;

//             let row = mapRow.get(employeeId);
//             if(!row) {
//                 row = {
//                     full_name: `${user.first_name} ${user.last_name}`,
//                     supervisor: sup? `${sup.first_name} ${sup.last_name }` : '',
//                     total_regular_hrs: 0,
//                     total_evening_hrs: 0,
//                     total_overtime_hrs: 0,
//                     total_expenses: 0,
//                     total_mileage: 0,
//                     is_approved: false,
//                 };
//             }
//             const hours = computeHours(shift.start_time, shift.end_time);

//             switch(shift.bank_code.type) {
//                 case 'regular' : row.total_regular_hrs += hours;
//                     break;
//                 case 'evening' : row.total_evening_hrs += hours;
//                     break;
//                 case 'overtime' : row.total_overtime_hrs += hours;
//                     break;
//                 default: row.total_regular_hrs += hours;
//             }
//             mapRow.set(employeeId, row);
//         }

//         for(const exp of expenses) {
//             const employee_id = exp.timesheet.employee.user_id;
//             const user = exp.timesheet.employee.user;
//             const sup = exp.timesheet.employee.supervisor?.user;

//             let row = mapRow.get(employee_id);
//             if(!row) {
//                 row = {
//                     full_name: `${user.first_name} ${user.last_name}`,
//                     supervisor: sup? `${sup.first_name} ${sup.last_name }` : '',
//                     total_regular_hrs: 0,
//                     total_evening_hrs: 0,
//                     total_overtime_hrs: 0,
//                     total_expenses: 0,
//                     total_mileage: 0,
//                     is_approved: false,
//                 };
//             }
//             const amount = Number(exp.amount);
//             row.total_expenses += amount;
//             if(exp.bank_code.type === 'mileage') {
//                 row.total_mileage += amount;
//             }
//             mapRow.set(employee_id, row);
//         }
//         //return by default the list of employee in ascending alphabetical order
//         return Array.from(mapRow.values()).sort((a,b) => a.full_name.localeCompare(b.full_name));
//     }
// }