// Node.js 22+. Keep this file and proposal-data.json in the same folder.
const { readFile, writeFile } = require('node:fs/promises');
const path = require('node:path');

async function main() {
    const apiToken = process.env.TMPLVISION_API_TOKEN;
    const templateId = process.env.TMPLVISION_TEMPLATE_ID;
    const region = process.env.TMPLVISION_REGION || 'eu';
    if (!apiToken || !templateId) {
        throw new Error('Set TMPLVISION_API_TOKEN and TMPLVISION_TEMPLATE_ID first.');
    }
    if (!['eu', 'us'].includes(region)) throw new Error('TMPLVISION_REGION must be eu or us.');
    const input = process.argv[2] || path.join(__dirname, 'proposal-data.json');
    const variables = JSON.parse(await readFile(input, 'utf8'));
    const form = new FormData();
    form.append('data', JSON.stringify({ templateId, variables }));
    const response = await fetch(`https://${region}.api.tmplvision.io/v1/generation/pdf`, {
        method: 'POST',
        headers: { 'x-apitoken': apiToken },
        body: form,
        signal: AbortSignal.timeout(120000),
    });
    if (response.status !== 201) {
        throw new Error(`HTTP ${response.status}: ${await response.text()}`);
    }
    const pdf = Buffer.from(await response.arrayBuffer());
    if (pdf.subarray(0, 5).toString() !== '%PDF-') throw new Error('The API did not return a PDF.');
    await writeFile('proposal.pdf', pdf);
    console.log('Saved proposal.pdf');
}
main().catch(error => {
    console.error(error.message);
    process.exitCode = 1;
});