import { BadRequestException, Injectable } from "@nestjs/common";
import { PrismaService } from "src/prisma/prisma.service";
import { LeaveTypes } from "@prisma/client";
// import { toDateOnly, toStringFromDate } from "src/time-and-attendance/modules/shared/helpers/date-time.helpers";
import { UpsertAction } from "src/time-and-attendance/modules/shared/types/upsert-actions.types";
import { toDateFromString, toStringFromDate } from "src/time-and-attendance/utils/date-time.utils";
// import { ShiftsUpsertService } from "src/time-and-attendance/modules/time-tracker/shifts/services/shifts-upsert.service";

@Injectable()
export class LeaveRequestsUtils {
    constructor(
        private readonly prisma: PrismaService,
        // private readonly shiftsService: ShiftsUpsertService,
    ){}

    async syncShift(
        email:       string,
        employee_id: number,
        date:        string,
        hours:       number,
        type:        LeaveTypes,
        comment?:    string,
    ) {
        if (hours <= 0) return;

        const duration_minutes = Math.round(hours * 60);
        if (duration_minutes > 8 * 60) {
            throw new BadRequestException("Amount of hours cannot exceed 8 hours per day.");
        }
        const date_only = toDateFromString(date);
        const yyyy_mm_dd = toStringFromDate(date_only);



        const start_minutes = 8 * 60;
        const end_minutes = start_minutes + duration_minutes;
        const toHHmm = (total: number) =>
            `${String(Math.floor(total / 60)).padStart(2, "0")}:${String(total % 60).padStart(2, "0")}`;

        const existing = await this.prisma.shifts.findFirst({
            where: {
                date: date_only,
                bank_code: { type },
                timesheet: { employee_id: employee_id },
            },
            include: { bank_code: true },
        });

        const action: UpsertAction = existing ? 'update' : 'create';

        // await this.shiftsService.upsertShifts(email, action, {
        //     old_shift: existing
        //         ? {
        //             date: yyyy_mm_dd,
        //             start_time: existing.start_time.toISOString().slice(11, 16),
        //             end_time:   existing.end_time.toISOString().slice(11, 16),
        //             type:       existing.bank_code?.type ?? type,
        //             is_remote:  existing.is_remote,
        //             is_approved:existing.is_approved,
        //             comment:    existing.comment ?? undefined,
        //         }
        //         : undefined,
        //     new_shift: {
        //         date: yyyy_mm_dd,
        //         start_time: toHHmm(start_minutes),
        //         end_time:   toHHmm(end_minutes),
        //         is_remote:  existing?.is_remote ?? false,
        //         is_approved:existing?.is_approved ?? false,
        //         comment:    comment ?? existing?.comment ?? "",
        //         type:       type,
        //     },
        // });
    }

    async removeShift(
        email: string,
        employee_id: number,
        iso_date: string,
        type: LeaveTypes,
    ) {
        const date_only = toDateFromString(iso_date);
        const yyyy_mm_dd = toStringFromDate(date_only);
        const existing = await this.prisma.shifts.findFirst({
            where: {
                date: date_only,
                bank_code: { type },
                timesheet: { employee_id: employee_id },
            },
            include: { bank_code: true },
        });
        if (!existing) return;

        // await this.shiftsService.upsertShifts(email, 'delete', {
        //     old_shift: {
        //         date: yyyy_mm_dd,
        //         start_time: hhmmFromLocal(existing.start_time),
        //         end_time:   hhmmFromLocal(existing.end_time),
        //         type:       existing.bank_code?.type ?? type,
        //         is_remote:  existing.is_remote,
        //         is_approved:existing.is_approved,
        //         comment:    existing.comment ?? undefined,
        //     },
        // });
    }

}