#!/usr/bin/env node
// Regenerate setup_sql/schema.generated.sql — a readable snapshot of the current
// pf schema, for reference only. Migrations are the source of truth; this file is
// generated so it cannot drift from the database the way a hand-maintained
// schema file does. Never edit it, and never apply it to create a database.

require('dotenv').config();
const { spawnSync } = require('child_process');
const fs   = require('fs');
const path = require('path');

const out = path.join(__dirname, '..', 'setup_sql', 'schema.generated.sql');

const result = spawnSync('pg_dump', [
    '--schema-only', '--no-owner', '--no-privileges',
    '--schema=pf',
    // per-version forecast tables are created at runtime — including them would
    // make this file churn every time a version is created or dropped
    '--exclude-table=pf.fc_*',
    '-f', out
], {
    stdio: 'inherit',
    env: {
        ...process.env,
        PGHOST:     process.env.DB_HOST,
        PGPORT:     process.env.DB_PORT || '5432',
        PGDATABASE: process.env.DB_NAME,
        PGUSER:     process.env.DB_USER,
        PGPASSWORD: process.env.DB_PASSWORD
    }
});

if (result.error) {
    console.error(`pg_dump failed: ${result.error.message}`);
    process.exit(1);
}
if (result.status !== 0) process.exit(result.status);

// Strip the lines pg_dump varies between runs — a random \restrict token and the
// server/client version banner — so regenerating an unchanged schema produces an
// identical file instead of a spurious diff.
const cleaned = fs.readFileSync(out, 'utf8')
    .split('\n')
    .filter(l => !/^\\(un)?restrict /.test(l))
    .filter(l => !/^-- Dumped (from|by) /.test(l))
    .join('\n')
    .replace(/\n{3,}/g, '\n\n');
fs.writeFileSync(out, cleaned);

console.log(`wrote ${path.relative(process.cwd(), out)} (${cleaned.split('\n').length} lines)`);