import { Injectable } from "@nestjs/common";
import { Result } from "src/common/errors/result-error.factory";
import { PrismaService } from "prisma/postgres/prisma-postgres.service";

@Injectable()
export class MileageService {

    constructor(private readonly prisma: PrismaService) { }

    public async calculateReimbursement(amount: number, bank_code_id: number): Promise<Result<number, string>> {
        if (amount < 0) return { success: false, error: 'The amount must be higher than 0' };

        //fetch modifier
        const bank_code = await this.prisma.bankCodes.findUnique({
            where: { id: bank_code_id },
            select: { modifier: true, type: true },
        });
        if (!bank_code) return { success: false, error: `bank_code ${bank_code_id} not found` }

        //calculate total amount to reimburs
        const reimboursement = amount * bank_code.modifier;
        const result = parseFloat(reimboursement.toFixed(2));
        return { success: true, data: result };
    }
}