import pool, { run } from '../db/index.js';

const MAX_NAME_LENGTH = 100;

function parseDesign(row) {
  if (!row) return null;
  try {
    return { ...row, config: JSON.parse(row.config) };
  } catch {
    return { ...row, config: null };
  }
}

export async function getSavedDesigns(req, res) {
  try {
    const { rows } = await pool.query(
      `SELECT id, name, config, created_at, updated_at
       FROM saved_designs
       ORDER BY updated_at DESC, id DESC`
    );
    res.json(rows.map(parseDesign));
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

export async function createSavedDesign(req, res) {
  try {
    const name = String(req.body?.name || '').trim();
    const config = req.body?.config;

    if (!name) return res.status(400).json({ error: 'Le nom est requis.' });
    if (name.length > MAX_NAME_LENGTH) {
      return res.status(400).json({ error: `Le nom ne peut pas dépasser ${MAX_NAME_LENGTH} caractères.` });
    }
    if (!config || typeof config !== 'object' || Array.isArray(config)) {
      return res.status(400).json({ error: 'Configuration invalide.' });
    }

    await run(
      `INSERT INTO saved_designs (name, config)
       VALUES ($1, $2)`,
      [name, JSON.stringify(config)]
    );
    const { rows } = await pool.query(
      `SELECT id, name, config, created_at, updated_at
       FROM saved_designs
       ORDER BY id DESC
       LIMIT 1`
    );
    res.status(201).json(parseDesign(rows[0]));
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

export async function updateSavedDesign(req, res) {
  try {
    const id = Number(req.params.id);
    const name = String(req.body?.name || '').trim();
    const config = req.body?.config;

    if (!Number.isInteger(id) || id < 1) {
      return res.status(400).json({ error: 'Identifiant invalide.' });
    }
    if (!name) return res.status(400).json({ error: 'Le nom est requis.' });
    if (name.length > MAX_NAME_LENGTH) {
      return res.status(400).json({ error: `Le nom ne peut pas dépasser ${MAX_NAME_LENGTH} caractères.` });
    }
    if (!config || typeof config !== 'object' || Array.isArray(config)) {
      return res.status(400).json({ error: 'Configuration invalide.' });
    }

    const { rows } = await pool.query('SELECT id FROM saved_designs WHERE id = $1 LIMIT 1', [id]);
    if (rows.length === 0) return res.status(404).json({ error: 'Armoire sauvegardée introuvable.' });

    await run(
      `UPDATE saved_designs
       SET name = $1, config = $2, updated_at = datetime('now')
       WHERE id = $3`,
      [name, JSON.stringify(config), id]
    );
    const { rows: updatedRows } = await pool.query(
      `SELECT id, name, config, created_at, updated_at
       FROM saved_designs
       WHERE id = $1
       LIMIT 1`,
      [id]
    );
    res.json(parseDesign(updatedRows[0]));
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

export async function deleteSavedDesign(req, res) {
  try {
    const id = Number(req.params.id);
    if (!Number.isInteger(id) || id < 1) {
      return res.status(400).json({ error: 'Identifiant invalide.' });
    }

    const { rows } = await pool.query('SELECT id FROM saved_designs WHERE id = $1 LIMIT 1', [id]);
    if (rows.length === 0) return res.status(404).json({ error: 'Armoire sauvegardée introuvable.' });

    await run('DELETE FROM saved_designs WHERE id = $1', [id]);
    res.status(204).end();
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}