feat(business-logic): holiday implementation for leave Requests

src/business-logic/holiday.service.ts

@@ -0,0 +1,56 @@
+import { Injectable, Logger } from "@nestjs/common";
+import { PrismaService } from "src/prisma/prisma.service";
+
+@Injectable()
+export class HolidayService {
+    private readonly logger = new Logger(HolidayService.name);
+
+    constructor(private readonly prisma: PrismaService) {}
+
+    //return the sunday of the current week that includes the holiday
+    private getWeekStart(date: Date): Date {
+        const day = new Date(date);
+        const offset = day.getDay();
+        day.setDate(day.getDate() - offset);
+        day.setHours(0,0,0,0);
+        return day;
+    }
+
+    //rounds minutes to 5s
+    private computeHours(start: Date, end: Date): number {
+        const durationMS = end.getTime() - start.getTime();
+        const totalMinutes = durationMS / 60000;
+        const rounded = Math.round(totalMinutes / 5) * 5;
+        return rounded / 60;
+    }
+
+    private async computeHoursPrevious4Weeks(employeeId: number, holidayDate: Date): Promise<number> {
+        //sets the end of the window to 1ms before the week with the holiday
+        const holidayWeekStart = this.getWeekStart(holidayDate);
+        const windowEnd = new Date(holidayWeekStart.getTime() - 1);
+        //sets the start of the window to 28 days ( 4 completed weeks ) before the week with the holiday
+        const windowStart = new Date(windowEnd.getTime() - 28 * 24 * 60 * 60000 + 1 )
+
+        const validCodes = ['G1', 'G45', 'G56', 'G104', 'G105', 'G700'];
+        //fetches all shift of the employee in said window ( 4 completed weeks )
+        const shifts = await this.prisma.shifts.findMany({
+            where: { timesheet: { employee_id: employeeId } ,
+            date:  { gte: windowStart, lte: windowEnd },
+            bank_code: { bank_code: { in: validCodes } },
+            },
+            select: { date: true, start_time: true, end_time: true },
+        });
+
+        const totalHours = shifts.map(s => this.computeHours(s.start_time, s.end_time)).reduce((sum, h)=> sum + h, 0);
+        const dailyHours = totalHours / 20;
+
+        return dailyHours;
+    }
+
+    async calculateHolidayPay( employeeId: number, holidayDate: Date, modifier: number): Promise<number> {
+        const hours = await this. computeHoursPrevious4Weeks(employeeId, holidayDate);
+        const dailyRate = Math.min(hours, 8);
+        this.logger.debug(`Holiday pay calculation: hours=${hours.toFixed(2)}`);
+        return dailyRate * modifier;
+    }
+}

src/modules/leave-requests/leave-requests.module.ts

@@ -2,10 +2,15 @@ import { PrismaService } from "src/prisma/prisma.service";
 import { LeaveRequestController } from "./controllers/leave-requests.controller";
 import { LeaveRequestsService } from "./services/leave-requests.service";
 import { Module } from "@nestjs/common";
+import { HolidayService } from "src/business-logic/holiday.service";
 
 @Module({
     controllers: [LeaveRequestController],
-    providers: [ LeaveRequestsService, PrismaService],
+    providers: [ 
+        LeaveRequestsService,
+        PrismaService,
+        HolidayService,
+    ],
     exports: [ LeaveRequestsService],
 })
 

src/modules/leave-requests/services/leave-requests.service.ts

@@ -3,87 +3,78 @@ import { PrismaService } from "src/prisma/prisma.service";
 import { CreateLeaveRequestsDto } from "../dtos/create-leave-requests.dto";
 import { LeaveRequests, LeaveRequestsArchive } from "@prisma/client";
 import { UpdateLeaveRequestsDto } from "../dtos/update-leave-requests.dto";
+import { HolidayService } from "src/business-logic/holiday.service";
 
 @Injectable()
 export class LeaveRequestsService {
-    constructor(private readonly prisma: PrismaService) {}
+    constructor(
+        private readonly prisma: PrismaService,
+        private readonly holidayService: HolidayService,
+    ) {}
 
     async create(dto: CreateLeaveRequestsDto): Promise<LeaveRequests> {
-        const {
-            employee_id,
-            bank_code_id,
-            leave_type,
-            start_date_time,
-            end_date_time,
-            comment,
-            approval_status,
-        } = dto;
+        const { employee_id, bank_code_id, leave_type, start_date_time,
+            end_date_time, comment, approval_status } = dto;
 
         return this.prisma.leaveRequests.create({
-            data: {
-                employee_id,
-                bank_code_id,
-                leave_type,
-                start_date_time,
-                end_date_time,
-                comment,
-                approval_status: approval_status ?? undefined,
-            },
-            include: {
-                employee: {
-                    include: {
-                        user: true
-                    },
-                },
+            data: { employee_id, bank_code_id, leave_type, start_date_time,
+                end_date_time, comment, approval_status: approval_status ?? undefined
             },
+            include: { employee: { include: { user: true } } },
         });
     }
 
-    findAll(): Promise<LeaveRequests[]> {
-        return this.prisma.leaveRequests.findMany({
-            include: {
-                employee: {
-                    include: {
-                        user: true
-                    },
-                },
+    async findAll(): Promise<any[]> {
+        const list = await this.prisma.leaveRequests.findMany({
+            include: { employee: { include: { user: true } },
                        bank_code: true,
             },
         });
+
+        return Promise.all(
+            list.map(async request => {
+                if(request.bank_code?.type === 'holiday') {
+                    const cost = await this.holidayService.calculateHolidayPay(
+                        request.employee_id,
+                        request.start_date_time,
+                        request.bank_code.modifier
+                    );
+                return { ...request, cost };
+                }
+            return request;
+            }),
+        );
     }
 
-    async findOne(id:number): Promise<LeaveRequests> {
-        const req = await this.prisma.leaveRequests.findUnique({
+    async findOne(id:number): Promise<any> {
+        const request = await this.prisma.leaveRequests.findUnique({
         where: { id },
-            include: {
-                employee: {
-                    include: {
-                        user: true
-                    },
-                },
+            include: { employee: { include: { user: true } },
                        bank_code: true,
             }, 
         });
-        if(!req) {
+        if(!request) {
             throw new NotFoundException(`LeaveRequest #${id} not found`);
         }
-        return req;
-    }
 
+        //search for leave type. if holiday
+        if (request.bank_code?.type === 'holiday') {
+            const cost = await this.holidayService.calculateHolidayPay(
+                request.employee_id,
+                request.start_date_time,
+                request.bank_code.modifier,
+            );
+            return { ...request, cost };
+        }
+        return request;
+    }
 
     async update(
         id: number,
         dto: UpdateLeaveRequestsDto,
     ): Promise<LeaveRequests> {
         await this.findOne(id);
-        const {
-            employee_id,
-            leave_type,
-            start_date_time,
-            end_date_time,
-            comment,
-            approval_status,
-        } = dto;
+        const { employee_id, leave_type, start_date_time, end_date_time, comment, approval_status } = dto;
         return this.prisma.leaveRequests.update({
             where: { id },
             data: {
@@ -94,13 +85,7 @@ export class LeaveRequestsService {
                 ...(comment !== undefined && { comment }),
                 ...(approval_status == undefined && { approval_status }),
             },
-            include: {
-                employee: {
-                    include: {
-                        user:true
-                    },
-                },
-            },
+            include: { employee: { include: { user:true } } },
         });
     }