/**
 * Local test harness for the SCMVAS/SCMHVAS datasheet pipeline extension.
 *
 * Loads samples/vaslog-dat/HVAS-M04.DAT, parses it through the updated
 * multiline parser (no DB), feeds each parsed record through
 * generateSCMVASDatasheet(), and prints the output for visual comparison
 * against samples/corrected-hvas and samples/vaslog-engtxt.
 */

const path = require('path');
const fs = require('fs');

const { parseMultilineFile } = require('./parsers/multiline');
const { generateSCMVASDatasheet, extractSCMVASAccuracy } = require('./templates/datasheet-exact');
const { parseVaslogEngTxt } = require('./parsers/vaslog-engtxt');

const RESEARCH_DIR = path.join(__dirname, '..', 'scmvas-hvas-research');
const DAT_SAMPLE = path.join(RESEARCH_DIR, 'samples', 'vaslog-dat', 'HVAS-M04.DAT');
const ENG_SAMPLE_DIR = path.join(RESEARCH_DIR, 'samples', 'vaslog-engtxt');
const GOLDEN_SAMPLE = path.join(RESEARCH_DIR, 'samples', 'vaslog-engtxt', '166590-110042023104524.txt');

function hr(title) {
    console.log('');
    console.log('='.repeat(78));
    console.log(title);
    console.log('='.repeat(78));
}

function testAccuracyExtraction() {
    hr('[TEST] Accuracy extraction regex');
    const cases = [
        { raw: '"PASS-7.005501E-033"', expect: { passFail: 'PASS', approx: 0.007 } },
        { raw: '"PASS 4.988443E-033"', expect: { passFail: 'PASS', approx: 0.005 } },
        { raw: '"PASS 1.524978E-023"', expect: { passFail: 'PASS', approx: 0.015 } },
        { raw: '"FAIL 2.500000E-013"', expect: { passFail: 'FAIL', approx: 0.25 } },
        { raw: '"PASS-1.254585E-033"', expect: { passFail: 'PASS', approx: 0.001 } },
        // Plain-decimal variants (QB STR$ emits these for values above its
        // scientific-notation threshold). Observed in ~1.6% of historical records.
        { raw: '"PASS .01599373"',     expect: { passFail: 'PASS', approx: 0.016 } },
        { raw: '"PASS .02399053"',     expect: { passFail: 'PASS', approx: 0.024 } },
        { raw: '"PASS-.00499773"',     expect: { passFail: 'PASS', approx: 0.005 } },
        { raw: '"FAIL .05000000"',     expect: { passFail: 'FAIL', approx: 0.050 } },
    ];
    for (const c of cases) {
        const got = extractSCMVASAccuracy(c.raw);
        const ok = got && got.passFail === c.expect.passFail && Math.abs(Math.abs(got.value) - c.expect.approx) < 0.001;
        console.log(`  ${ok ? '[OK]  ' : '[FAIL]'} ${c.raw.padEnd(28)} -> ${JSON.stringify(got)}`);
    }
}

function testDatParsingAndGeneration() {
    hr(`[TEST] Parse ${path.basename(DAT_SAMPLE)} + generate datasheets`);

    if (!fs.existsSync(DAT_SAMPLE)) {
        console.log(`[FAIL] sample not found: ${DAT_SAMPLE}`);
        return;
    }

    const records = parseMultilineFile(DAT_SAMPLE, 'VASLOG', 'TS-3R');
    console.log(`[INFO] parsed ${records.length} records`);

    records.forEach((r, idx) => {
        console.log('');
        console.log('-'.repeat(78));
        console.log(`[REC ${idx + 1}] model=${r.model_number} sn=${r.serial_number} date=${r.test_date} result=${r.overall_result}`);
        console.log('-'.repeat(78));
        const txt = generateSCMVASDatasheet(r);
        if (!txt) {
            console.log('[WARN] datasheet generation returned null');
            return;
        }
        console.log(txt);
    });
}

function testEngTxtPassthrough() {
    hr('[TEST] Engineering-Tested .txt parser');

    if (!fs.existsSync(ENG_SAMPLE_DIR)) {
        console.log(`[FAIL] sample dir not found: ${ENG_SAMPLE_DIR}`);
        return;
    }

    const files = fs.readdirSync(ENG_SAMPLE_DIR)
        .filter(n => n.toLowerCase().endsWith('.txt'))
        .slice(0, 3)
        .map(n => path.join(ENG_SAMPLE_DIR, n));

    for (const f of files) {
        const recs = parseVaslogEngTxt(f, 'TS-3R');
        console.log('');
        console.log(`[INFO] ${path.basename(f)} -> ${recs.length} record(s)`);
        for (const r of recs) {
            console.log(`  log_type=${r.log_type} model=${r.model_number} sn=${r.serial_number} date=${r.test_date} result=${r.overall_result}`);
            console.log(`  raw_data bytes=${r.raw_data.length}`);
        }
    }
}

function testGoldenComparison() {
    hr('[TEST] Golden comparison (mock a record that matches 166590-1)');

    if (!fs.existsSync(GOLDEN_SAMPLE)) {
        console.log(`[FAIL] golden not found: ${GOLDEN_SAMPLE}`);
        return;
    }

    // Build a synthetic record with the same fields the VASLOG import would
    // produce if 166590-1 had been logged through the production pipeline.
    const mock = {
        log_type: 'VASLOG',
        model_number: 'SCMHVAS-M0200',
        serial_number: '166590-1',
        test_date: '2023-10-04',
        overall_result: 'PASS',
        raw_data: [
            '"SCMHVAS-M0200 "',
            '0,0,0,0,""',
            '0,0,0,0,""',
            '0,0,0,0,""',
            '0,0,0,0,""',
            '0,0,0,0,""',
            '0',
            '"","","",""',
            '"","","",""',
            '"PASS-7.005501E-033","","",""',
            '"","","",""',
            '"166590-1","10-04-2023"',
        ].join('\n'),
    };

    const generated = generateSCMVASDatasheet(mock);
    const golden = fs.readFileSync(GOLDEN_SAMPLE, 'utf8');

    console.log('');
    console.log('--- GENERATED ---');
    console.log(generated);
    console.log('');
    console.log('--- GOLDEN ---');
    console.log(golden);

    const genLines = generated.split(/\r?\n/);
    const goldLines = golden.split(/\r?\n/);
    console.log('');
    console.log(`[INFO] generated lines=${genLines.length}  golden lines=${goldLines.length}`);
    const max = Math.max(genLines.length, goldLines.length);
    let diffs = 0;
    for (let i = 0; i < max; i++) {
        const g = genLines[i] || '';
        const d = goldLines[i] || '';
        if (g !== d) {
            diffs++;
            if (diffs <= 8) {
                console.log(`[DIFF] line ${i + 1}:`);
                console.log(`  gen: [${g}] (len ${g.length})`);
                console.log(`  gld: [${d}] (len ${d.length})`);
            }
        }
    }
    console.log(`[INFO] total differing lines: ${diffs}`);
}

testAccuracyExtraction();
testDatParsingAndGeneration();
testEngTxtPassthrough();
testGoldenComparison();