#!/usr/bin/env node
/**
 * DSS Postinstall Script
 *
 * Sets up Python virtual environment and installs dependencies
 * after npm install.
 */

import { spawn, execSync } from 'child_process';
import { existsSync, mkdirSync } from 'fs';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const pythonDir = join(__dirname, '..', 'python');
const venvDir = join(pythonDir, 'venv');
const apiDir = join(pythonDir, 'api');

console.log('[DSS] Setting up Python environment...');

// Check if Python 3 is available
function getPythonCmd() {
  const commands = ['python3', 'python'];
  for (const cmd of commands) {
    try {
      execSync(`${cmd} --version`, { stdio: 'ignore' });
      return cmd;
    } catch {
      continue;
    }
  }
  return null;
}

const python = getPythonCmd();

if (!python) {
  console.error('[DSS] Error: Python 3 is required but not found.');
  console.error('[DSS] Please install Python 3.8+ and try again.');
  process.exit(1);
}

console.log(`[DSS] Using ${python}`);

// Create virtual environment if needed
if (!existsSync(venvDir)) {
  console.log('[DSS] Creating virtual environment...');
  try {
    execSync(`${python} -m venv ${venvDir}`, { stdio: 'inherit' });
  } catch (error) {
    console.error('[DSS] Failed to create virtual environment');
    console.error('[DSS] Try: pip install virtualenv');
    process.exit(1);
  }
}

// Install requirements
const pip = join(venvDir, 'bin', 'pip');
const requirements = join(apiDir, 'requirements.txt');

if (existsSync(requirements)) {
  console.log('[DSS] Installing Python dependencies...');
  try {
    execSync(`${pip} install -q -r ${requirements}`, { stdio: 'inherit' });
    console.log('[DSS] Python environment ready!');
  } catch (error) {
    console.error('[DSS] Failed to install Python dependencies');
    process.exit(1);
  }
} else {
  console.log('[DSS] No requirements.txt found, skipping dependency install');
}

console.log('[DSS] Setup complete!');