// services/sales/db.js
// Thin helpers over the portal's own app DB (services/appSqlPool.js) for the
// Sales Order module (replacement for the old msale/MySQL portal). Every
// Sales table lives in the APP database (ZSO_* prefix) — never the SAP DB.
'use strict';
const sql = require('mssql');
const { getPool } = require('../appSqlPool');

// Bind `?` placeholders positionally (same convention as appSqlPool.query),
// but with explicit types for numbers so decimals don't round-trip as FLOAT
// surprises and big ints don't overflow INT.
function bind(req, text, params) {
  let i = 0;
  return text.replace(/\?/g, () => {
    const name = `p${i}`;
    const v = params[i];
    if (v === undefined || v === null) req.input(name, sql.NVarChar, null);
    else if (typeof v === 'number') req.input(name, Number.isInteger(v) && Math.abs(v) < 2147483647 ? sql.Int : sql.Decimal(19, 4), v);
    else if (typeof v === 'boolean') req.input(name, sql.Bit, v ? 1 : 0);
    else if (v instanceof Date) req.input(name, sql.DateTime2, v);
    else req.input(name, sql.NVarChar(sql.MAX), String(v));
    i++;
    return `@${name}`;
  });
}

async function query(text, params = [], runner = null) {
  const r = runner ? runner.request() : (await getPool()).request();
  const res = await r.query(bind(r, text, params));
  return res.recordset || [];
}

async function one(text, params = [], runner = null) {
  const rows = await query(text, params, runner);
  return rows[0] || null;
}

// Run fn(tx) inside a SQL transaction; fn receives a runner usable as the
// 3rd arg of query()/one(). Rolls back on any throw.
async function tx(fn) {
  const pool = await getPool();
  const t = new sql.Transaction(pool);
  await t.begin();
  try {
    const out = await fn(t);
    await t.commit();
    return out;
  } catch (e) {
    try { await t.rollback(); } catch (_e) {}
    throw e;
  }
}

function json(v, fb) { if (v == null || v === '') return fb; try { return JSON.parse(v); } catch (_e) { return fb; } }
function csv(v) { return String(v || '').split(',').map(s => s.trim()).filter(Boolean); }
function round2(n) { return Math.round((Number(n) || 0) * 100) / 100; }

module.exports = { query, one, tx, json, csv, round2, sql };