const express = require('express');
const router = express.Router();
const fs = require('fs');
const path = require('path');
const { db, logAttivita } = require('../activityDb');
const pool = require('../db');

const baseDir = process.pkg ? path.dirname(process.execPath) : path.resolve(__dirname, '..');
const envPath = fs.existsSync(path.resolve(baseDir, '.env'))
  ? path.resolve(baseDir, '.env')
  : path.resolve(__dirname, '..', '.env');

// Helper to resolve agent name from DB
async function resolveAgentName(agentId) {
  try {
    const r = await pool.query(
      `SELECT first_name, last_name, login FROM users WHERE id = $1`,
      [agentId]
    );
    if (r.rows.length > 0) {
      const u = r.rows[0];
      return (u.first_name || '') + ' ' + (u.last_name || '') || u.login || `Agent #${agentId}`;
    }
  } catch (_) { /* ignore */ }
  return `Agent #${agentId}`;
}

// GET /api/config/env — Read current .env file and history
router.get('/env', async (req, res) => {
  try {
    let content = '';
    if (fs.existsSync(envPath)) {
      content = fs.readFileSync(envPath, 'utf8');
    }

    const history = db.prepare(`
      SELECT * FROM env_history ORDER BY id DESC LIMIT 100
    `).all();

    res.json({ content, history });
  } catch (err) {
    console.error('Error reading env config:', err);
    res.status(500).json({ error: 'Errore durante la lettura del file .env', message: err.message });
  }
});

// POST /api/config/env — Save updated .env content and create snapshot in SQLite
router.post('/env', async (req, res) => {
  try {
    const { content, note } = req.body;
    const operatorId = parseInt(req.headers['x-agent-id'] || '1', 10);
    const agentName = await resolveAgentName(operatorId);

    if (typeof content !== 'string') {
      return res.status(400).json({ error: 'Il contenuto del file .env è obbligatorio' });
    }

    // If history is empty and current .env exists, create an initial baseline snapshot
    const countRow = db.prepare('SELECT COUNT(*) AS count FROM env_history').get();
    if (countRow.count === 0 && fs.existsSync(envPath)) {
      const initialContent = fs.readFileSync(envPath, 'utf8');
      db.prepare(`
        INSERT INTO env_history (agent_id, agent_name, content, note)
        VALUES (?, ?, ?, ?)
      `).run(operatorId, agentName, initialContent, 'Baseline iniziale preesistente');
    }

    // Write updated content to disk
    fs.writeFileSync(envPath, content, 'utf8');
    try { require('dotenv').config({ path: envPath, override: true }); } catch (_) {}

    // Save snapshot in history table
    const info = db.prepare(`
      INSERT INTO env_history (agent_id, agent_name, content, note)
      VALUES (?, ?, ?, ?)
    `).run(operatorId, agentName, content, note || 'Modifica manuale .env');

    logAttivita({
      agente_id: operatorId,
      agente_nome: agentName,
      titolo_azione: 'Modifica .env',
      azione: { note: note || 'Modifica manuale .env', history_id: info.lastInsertRowid },
      esito: 'successo',
    });

    const history = db.prepare(`
      SELECT * FROM env_history ORDER BY id DESC LIMIT 100
    `).all();

    res.json({
      success: true,
      message: 'File .env aggiornato e salvato nello storico locale con successo!',
      history_id: info.lastInsertRowid,
      history,
    });
  } catch (err) {
    console.error('Error saving .env config:', err);
    res.status(500).json({ error: 'Errore durante il salvataggio del file .env', message: err.message });
  }
});

// POST /api/config/env/restore/:history_id — Restore a previous .env snapshot
router.post('/env/restore/:history_id', async (req, res) => {
  try {
    const { history_id } = req.params;
    const operatorId = parseInt(req.headers['x-agent-id'] || '1', 10);
    const agentName = await resolveAgentName(operatorId);

    const record = db.prepare('SELECT * FROM env_history WHERE id = ?').get(history_id);
    if (!record) {
      return res.status(404).json({ error: 'Versione di storico non trovata' });
    }

    // Write snapshot content to disk
    fs.writeFileSync(envPath, record.content, 'utf8');
    try { require('dotenv').config({ path: envPath, override: true }); } catch (_) {}

    // Insert new history record documenting the restore operation
    const restoreNote = `Ripristinato alla versione #${record.id} del ${record.created_at}`;
    const info = db.prepare(`
      INSERT INTO env_history (agent_id, agent_name, content, note)
      VALUES (?, ?, ?, ?)
    `).run(operatorId, agentName, record.content, restoreNote);

    logAttivita({
      agente_id: operatorId,
      agente_nome: agentName,
      titolo_azione: 'Ripristino .env',
      azione: { restored_from_id: record.id, new_history_id: info.lastInsertRowid },
      esito: 'successo',
    });

    const history = db.prepare(`
      SELECT * FROM env_history ORDER BY id DESC LIMIT 100
    `).all();

    res.json({
      success: true,
      message: `Versione #${record.id} ripristinata con successo!`,
      content: record.content,
      history,
    });
  } catch (err) {
    console.error('Error restoring .env version:', err);
    res.status(500).json({ error: 'Errore durante il ripristino della versione .env', message: err.message });
  }
});

// DELETE /api/config/env/history/:id — Delete a specific .env history entry
router.delete('/env/history/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const operatorId = parseInt(req.headers['x-agent-id'] || '1', 10);
    const agentName = await resolveAgentName(operatorId);

    const record = db.prepare('SELECT * FROM env_history WHERE id = ?').get(id);
    if (!record) {
      return res.status(404).json({ error: 'Versione di storico non trovata' });
    }

    db.prepare('DELETE FROM env_history WHERE id = ?').run(id);

    logAttivita({
      agente_id: operatorId,
      agente_nome: agentName,
      titolo_azione: 'Eliminazione Storico .env',
      azione: { deleted_history_id: id },
      esito: 'successo',
    });

    const history = db.prepare(`
      SELECT * FROM env_history ORDER BY id DESC LIMIT 100
    `).all();

    res.json({
      success: true,
      message: `Versione #${id} dello storico eliminata con successo!`,
      history,
    });
  } catch (err) {
    console.error('Error deleting .env history entry:', err);
    res.status(500).json({ error: 'Errore durante l\'eliminazione della versione dello storico', message: err.message });
  }
});

module.exports = router;