import { createReadStream } from 'fs';
import { createGunzip } from 'zlib';
import { PrismaClient } from '@prisma/client';
import { parseOaJson } from './oa-json';

const prisma = new PrismaClient();
const DUMP = process.env.OA_DUMP || '/opt/backup/cloud-20260830/oa.sql.gz';
const HR = '/opt/import/prod/oa_hr.json';

function n(v: unknown) {
  if (v == null || v === '') return 0;
  const x = Number(v);
  return Number.isFinite(x) ? x : 0;
}

function parseMysqlTuples(s: string): unknown[][] {
  const rows: unknown[][] = [];
  let i = 0;
  while (i < s.length) {
    while (i < s.length && ' \n\r\t,'.includes(s[i])) i += 1;
    if (i >= s.length) break;
    if (s[i] !== '(') throw new Error(`expected ( at ${i}`);
    i += 1;
    const row: unknown[] = [];
    while (true) {
      while (i < s.length && ' \n\r\t'.includes(s[i])) i += 1;
      if (s.startsWith('NULL', i) && (i + 4 === s.length || ',) \n\r\t'.includes(s[i + 4]))) {
        row.push(null);
        i += 4;
      } else if (s[i] === "'" || s[i] === '"') {
        const q = s[i];
        i += 1;
        let out = '';
        while (i < s.length) {
          const ch = s[i];
          if (ch === '\\') {
            out += s[i + 1];
            i += 2;
            continue;
          }
          if (ch === q) {
            if (s[i + 1] === q) {
              out += q;
              i += 2;
              continue;
            }
            i += 1;
            break;
          }
          out += ch;
          i += 1;
        }
        row.push(out);
      } else {
        const start = i;
        while (i < s.length && s[i] !== ',' && s[i] !== ')') i += 1;
        const raw = s.slice(start, i).trim();
        row.push(raw === '' ? null : /^-?\d+(\.\d+)?$/.test(raw) ? Number(raw) : raw);
      }
      while (i < s.length && ' \n\r\t'.includes(s[i])) i += 1;
      if (s[i] === ',') {
        i += 1;
        continue;
      }
      if (s[i] === ')') {
        i += 1;
        rows.push(row);
        break;
      }
      throw new Error(`bad token at ${i}`);
    }
  }
  return rows;
}

function insertsFor(dump: string, table: string) {
  const rows: unknown[][] = [];
  const needle = `INSERT INTO \`${table}\` VALUES `;
  let from = 0;
  while (true) {
    const start = dump.indexOf(needle, from);
    if (start < 0) break;
    let i = start + needle.length;
    while (i < dump.length) {
      while (i < dump.length && ' \n\r\t'.includes(dump[i])) i += 1;
      if (dump[i] === ';') {
        i += 1;
        break;
      }
      if (dump[i] === ',') {
        i += 1;
        continue;
      }
      if (dump[i] !== '(') break;
      const sliceStart = i;
      let depth = 0;
      let inStr = false;
      let q = '';
      while (i < dump.length) {
        const ch = dump[i];
        if (inStr) {
          if (ch === '\\') {
            i += 2;
            continue;
          }
          if (ch === q) inStr = false;
          i += 1;
          continue;
        }
        if (ch === "'" || ch === '"') {
          inStr = true;
          q = ch;
          i += 1;
          continue;
        }
        if (ch === '(') depth += 1;
        if (ch === ')') {
          depth -= 1;
          if (depth === 0) {
            i += 1;
            break;
          }
        }
        i += 1;
      }
      rows.push(...parseMysqlTuples(dump.slice(sliceStart, i)));
    }
    from = i;
  }
  return rows;
}

async function readDump() {
  return new Promise<string>((resolve, reject) => {
    const chunks: Buffer[] = [];
    createReadStream(DUMP)
      .pipe(createGunzip())
      .on('data', (c: Buffer) => chunks.push(c))
      .on('end', () => resolve(Buffer.concat(chunks).toString('utf8')))
      .on('error', reject);
  });
}

async function main() {
  const dump = await readDump();
  const hr = parseOaJson(HR) as { users?: { id: number; nickName?: string; phone?: string }[] };
  const employees = await prisma.employee.findMany({ select: { id: true, name: true, mobile: true } });
  const byName = new Map(employees.map((e) => [e.name, e]));
  const byMobile = new Map(employees.filter((e) => e.mobile).map((e) => [e.mobile as string, e]));
  const oaUserToEmp = new Map<number, string>();
  for (const u of hr.users || []) {
    const hit = (u.phone && byMobile.get(String(u.phone))) || (u.nickName && byName.get(u.nickName));
    if (hit) oaUserToEmp.set(Number(u.id), hit.id);
  }

  const months = insertsFor(dump, 'oa_salary_month');
  const slips = insertsFor(dump, 'oa_salary_slip');
  const admin = await prisma.user.findFirst({ where: { username: '18115604840' } });

  await prisma.payrollItem.deleteMany();
  await prisma.payrollRun.deleteMany();

  const runByYm = new Map<string, string>();
  for (const row of months) {
    const ym = String(row[1] || '');
    if (!/^\d{4}-\d{2}$/.test(ym)) continue;
    const confirmed = Number(row[2]) === 1;
    const run = await prisma.payrollRun.create({
      data: {
        tenantId: '1',
        yearMonth: ym,
        status: confirmed ? 'CONFIRMED' : 'DRAFT',
        createdById: admin?.id,
        confirmedAt: confirmed ? (row[7] ? new Date(String(row[7])) : new Date()) : null,
      },
    });
    runByYm.set(ym, run.id);
  }

  let ok = 0;
  let skip = 0;
  for (const row of slips) {
    const ym = String(row[2] || '');
    const oaUserId = Number(row[3]);
    const name = String(row[4] || '');
    let empId = oaUserToEmp.get(oaUserId);
    if (!empId && name) empId = byName.get(name)?.id;
    if (!empId || !runByYm.has(ym)) {
      skip += 1;
      continue;
    }
    await prisma.payrollItem.upsert({
      where: { runId_employeeId: { runId: runByYm.get(ym) as string, employeeId: empId } },
      update: {
        basePay: n(row[9]) + n(row[10]),
        performancePay: n(row[18] || row[11]),
        leaveDeduct: n(row[22]),
        sickDeduct: n(row[23]),
        socialPersonal: n(row[27]),
        tax: n(row[28]),
        grossPay: n(row[16]),
        netPay: n(row[30]),
        scheduledDays: n(row[31]),
        prorationFactor: n(row[29]) || 1,
      },
      create: {
        runId: runByYm.get(ym) as string,
        employeeId: empId,
        basePay: n(row[9]) + n(row[10]),
        performancePay: n(row[18] || row[11]),
        leaveDeduct: n(row[22]),
        sickDeduct: n(row[23]),
        socialPersonal: n(row[27]),
        tax: n(row[28]),
        grossPay: n(row[16]),
        netPay: n(row[30]),
        scheduledDays: n(row[31]),
        prorationFactor: n(row[29]) || 1,
      },
    });
    ok += 1;
  }
  console.log(
    JSON.stringify({
      months: runByYm.size,
      slips: slips.length,
      imported: ok,
      skipped: skip,
    }),
  );
}

main()
  .then(async () => prisma.$disconnect())
  .catch(async (e) => {
    console.error(e);
    await prisma.$disconnect();
    process.exit(1);
  });