import { PrismaClient as Prisma } from "@prisma/client";
import { PrismaClient as PrismaLegacy } from "@prisma/client-legacy"

const prisma_legacy = new PrismaLegacy({});
const prisma = new Prisma({});

export const initSupervisor = async () => {
    const list_of_employees = await prisma.employees.findMany();

    for (const employee of list_of_employees) {
        console.log('Start of supervisor checking for employee: ', employee.id);

        //finds in old db employee supervisor's infos 
        const old_employee = await prisma_legacy.employees.findFirst({
            where: {
                company: employee.company_code,
                employee_number: (employee.external_payroll_id).toString(),
            },
        });
        if (!old_employee) {
            console.warn('Old DB employee not found : ', employee.id);
            continue;
        }
        if (!old_employee.supervisor) {
            console.warn('Old DB employee supervisor not found for employee:', old_employee.supervisor);
            continue;
        }
        //trims and split the supervisor name
        const supervisor_full_name = old_employee.supervisor.trim();
        let supervisor_first_name = supervisor_full_name.split(/\s+/)[0];
        let supervisor_last_name = supervisor_full_name.split(/\s+/)[1] || '';

        if (supervisor_first_name === '[default]') {
            await prisma.employees.update({
                where: { id: employee.id },
                data: { supervisor_id: null },
            });
            console.log('employee with [default] found: ', employee.id);
            continue;
        }

        if (supervisor_first_name === '') {
            console.warn('No supervisor name found for employee: ', employee.id)
            continue;
        }

        //finds employee id of supervisors
        const supervisor = await prisma.users.findFirst({
            where: { first_name: supervisor_first_name, last_name: supervisor_last_name },
            select: {
                employee: { select: { id: true } },
            }
        });
        if (!supervisor) {
            console.warn('No supervisor found: ', supervisor_first_name, '', supervisor_last_name)
            continue;
        }
        if (!supervisor.employee) {
            console.warn('No supervisor id found: ', supervisor_first_name, '', supervisor_last_name)
            continue;
        }
        //updates the supervisor id
        await prisma.employees.update({
            where: { id: employee.id },
            data: {
                supervisor_id: supervisor.employee.id,

            }
        });
        await prisma.employees.update({
            where: { id: supervisor.employee.id },
            data: {
                is_supervisor: true,
            }
        })
        console.log('supervisor id : ', supervisor.employee.id);
        console.log('supervisor name : ', supervisor_first_name, '', supervisor_last_name);
    }
}