#!/usr/bin/env node
/*
 * Validates the public in-browser engine (assets/js/engine-public.js), which
 * only receives the folded model of engine_client_model(), against the values
 * recalculated by Microsoft Excel (tests/excel-fixtures.json). Only the fields
 * a visitor sees are compared (no deposito, income or spread).
 *
 *   node tests/validate_public.js
 */
'use strict';
const fs = require('fs');
const path = require('path');
const { execFileSync } = require('child_process');
const Engine = require('../assets/js/engine-public.js');

const root = path.join(__dirname, '..');
const fixtures = JSON.parse(fs.readFileSync(path.join(__dirname, 'excel-fixtures.json'), 'utf8').replace(/^\uFEFF/, ''));
const php = process.env.PHP_BIN || 'C:/laragon/bin/php/php-8.1.10-Win32-vs16-x64/php.exe';
const model = JSON.parse(execFileSync(php, ['-d', 'display_startup_errors=0', path.join(root, 'database/migrate.php'), '--dump-public-model'], { encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'] }));

// What a visitor receives must not contain the internal parameters.
const leaked = ['gwm', 'kas', 'porsi_puab', 'porsi_kredit', 'puab', 'kredit', 'ohc', 'depositoRates', 'settings'].filter(k => JSON.stringify(model).includes('"' + k + '"'));
if (leaked.length) { console.log('Model memuat parameter internal:', leaked.join(', ')); process.exit(1); }

const close = (a, b, kind) => kind === 'rate' ? Math.abs(a - b) < 1e-9 : Math.round(a) === Math.round(b) && Math.abs(a - b) < 0.01;
const RATE_FIELDS = new Set(['equiv', 'rateGiro', 'rateSimanja', 'rateSimpeda', 'totalRateGiro', 'totalRateSimanja', 'totalRateSimpeda', 'shareNasabah']);

function view(r) {
  const by = Object.fromEntries(r.comparison.map(c => [c.key, c]));
  const ok = r.eligible;
  return {
    cashbackGross: ok ? r.cashback.gross : null, cashbackNet: ok ? r.cashback.net : null,
    giroNet: by.giro.bungaNet, simanjaNet: by.simanja.bungaNet, simpedaNet: by.simpeda.bungaNet,
    totalGiro: ok ? by.giro.total : null, totalSimanja: ok ? by.simanja.total : null, totalSimpeda: ok ? by.simpeda.total : null,
    rateGiro: by.giro.rate, rateSimanja: by.simanja.rate, rateSimpeda: by.simpeda.rate,
    equiv: ok ? r.cashback.equiv : null,
    totalRateGiro: ok ? by.giro.totalRate : null, totalRateSimanja: ok ? by.simanja.totalRate : null, totalRateSimpeda: ok ? by.simpeda.totalRate : null,
    penaltyRefund: ok ? r.penalty.refund : null, penaltyTax: ok ? r.penalty.tax : null, penaltyFee: ok ? r.penalty.fee : null, penaltyTotal: ok ? r.penalty.total : null,
    shareNasabah: ok ? r.share : null
  };
}

let checks = 0; const failures = [];
for (const c of fixtures.cases) {
  const got = view(Engine.calculate(model, { nominal: c.nominal, tenor: c.tenor, customerType: 'perorangan' }));
  for (const [field, expected] of Object.entries(c)) {
    if (!(field in got)) continue;
    checks++;
    const actual = got[field];
    const pass = expected === null ? actual === null : actual !== null && close(actual, expected, RATE_FIELDS.has(field) ? 'rate' : 'idr');
    if (!pass) failures.push({ nominal: c.nominal, tenor: c.tenor, field, excel: expected, app: actual });
  }
}
console.log(`Public engine (model koefisien): ${checks - failures.length}/${checks} checks match Excel over ${fixtures.cases.length} cases`);
failures.slice(0, 20).forEach(f => console.log('  FAIL', JSON.stringify(f)));
process.exit(failures.length ? 1 : 0);