/**
 * Generate PDF datasheets for specific serial numbers
 * For Quatronix customer request - 70 datasheets needed urgently
 */

const fs = require('fs');
const path = require('path');
const Database = require('better-sqlite3');
const PDFDocument = require('pdfkit');

const { loadAllSpecs, getSpecs } = require('../parsers/spec-reader');
const { generateExactDatasheet } = require('../templates/datasheet-exact');

const DB_PATH = path.join(__dirname, 'testdata.db');
const OUTPUT_DIR = process.argv[2] || path.join(process.env.USERPROFILE, 'Desktop', 'Quatronix-Datasheets');

// Build the list of needed serial numbers
const needed = [
    // SCM5B34-03: 177368-6~15
    ...Array.from({length:10}, (_,i) => '177368-' + (i+6)),
    // SCM5B35-02: 177625-6~10
    ...Array.from({length:5}, (_,i) => '177625-' + (i+6)),
    // SCM5B38-05: 177963-6
    '177963-6',
    // SCM5B392-11: 177199-13
    '177199-13',
    // SCM5B40-03: 178444-1
    '178444-1',
    // SCM5B41-02: 178362-1
    '178362-1',
    // SCM5B42-02: 177299-4, 177299-5
    '177299-4', '177299-5',
    // SCM5B45-02D: 178607-1
    '178607-1',
    // SCM5B45-04: 178385-4~8
    ...Array.from({length:5}, (_,i) => '178385-' + (i+4)),
    // SCM5B48-01: 177593-1
    '177593-1',
    // SCM5B49-05: 177000-15
    '177000-15',
    // DSCA30-05C: 176566-2
    '176566-2',
    // DSCA38-19C: 178001-22, 178001-23
    '178001-22', '178001-23',
    // DSCA41-02: 178135-2
    '178135-2',
    // DSCA38-1468: 178595-1
    '178595-1',
    // SCM5B41-02: 177012-1~30
    ...Array.from({length:30}, (_,i) => '177012-' + (i+1)),
    // SCM5B47S-10: 178768-8
    '178768-8',
    // SCM5B45-04D: 177207-4~7
    ...Array.from({length:4}, (_,i) => '177207-' + (i+4)),
    // 8B51-12: 178601-6~9
    ...Array.from({length:4}, (_,i) => '178601-' + (i+6)),
];

async function generatePdf(txt, outputPath) {
    return new Promise((resolve, reject) => {
        const doc = new PDFDocument({
            size: 'LETTER',
            margins: { top: 36, bottom: 36, left: 36, right: 36 }
        });
        const stream = fs.createWriteStream(outputPath);
        stream.on('finish', resolve);
        stream.on('error', reject);
        doc.pipe(stream);
        doc.font('Courier').fontSize(9.5);
        const lines = txt.split(/\r?\n/);
        for (const line of lines) {
            doc.text(line, { lineGap: 1 });
        }
        doc.end();
    });
}

async function run() {
    console.log('========================================');
    console.log('Generate Customer PDFs');
    console.log('========================================');
    console.log(`Output: ${OUTPUT_DIR}`);
    console.log(`Serial numbers: ${needed.length}`);

    if (!fs.existsSync(OUTPUT_DIR)) {
        fs.mkdirSync(OUTPUT_DIR, { recursive: true });
    }

    const specMap = loadAllSpecs();
    const db = new Database(DB_PATH, { readonly: true });

    let generated = 0;
    let notFound = [];
    let noSpecs = [];
    let errors = [];

    for (const sn of needed) {
        const record = db.prepare(
            "SELECT * FROM test_records WHERE serial_number = ? AND overall_result = 'PASS' LIMIT 1"
        ).get(sn);

        if (!record) {
            notFound.push(sn);
            continue;
        }

        const specs = getSpecs(specMap, record.model_number);
        if (!specs) {
            noSpecs.push(sn + ' (' + record.model_number + ')');
            continue;
        }

        const txt = generateExactDatasheet(record, specs);
        if (!txt) {
            errors.push(sn + ' (format failed)');
            continue;
        }

        // Write TXT
        fs.writeFileSync(path.join(OUTPUT_DIR, sn + '.TXT'), txt, 'utf8');

        // Write PDF
        try {
            await generatePdf(txt, path.join(OUTPUT_DIR, sn + '.pdf'));
            generated++;
            process.stdout.write(`\rGenerated: ${generated}`);
        } catch (err) {
            errors.push(sn + ' (PDF: ' + err.message + ')');
        }
    }

    db.close();

    console.log('\n\n========================================');
    console.log('Results');
    console.log('========================================');
    console.log(`Generated: ${generated} (TXT + PDF)`);
    if (notFound.length > 0) {
        console.log(`\nNot in database (${notFound.length}):`);
        notFound.forEach(s => console.log('  ' + s));
    }
    if (noSpecs.length > 0) {
        console.log(`\nNo spec data (${noSpecs.length}):`);
        noSpecs.forEach(s => console.log('  ' + s));
    }
    if (errors.length > 0) {
        console.log(`\nErrors (${errors.length}):`);
        errors.forEach(s => console.log('  ' + s));
    }
}

run().catch(console.error);