/**
 * routes/accounts.mjs — Chart of Accounts endpoints
 */

export default function registerAccounts(app, pool, buildCtx, writeAudit, hermes) {
  // GET /api/ledger/accounts — hämta kontoplan
  app.get('/api/ledger/accounts', async (req, res) => {
    const tenant_id   = req.headers['x-tenant-id'] || 'wavult-group';
    const coa_standard = req.query.standard || null;
    try {
      const { rows } = await pool.query(
        `SELECT * FROM ledger_accounts
         WHERE tenant_id = $1 AND ($2::text IS NULL OR LOWER(coa_standard) = LOWER($2)) AND is_active = TRUE
         ORDER BY account_number`,
        [tenant_id, coa_standard]
      );
      res.json({ ok: true, accounts: rows, count: rows.length });
    } catch (e) {
      res.status(500).json({ ok: false, error: e.message });
    }
  });

  // POST /api/ledger/accounts — lägg till konto
  app.post('/api/ledger/accounts', async (req, res) => {
    const ctx = buildCtx(req, 'account');
    const { account_number, name, account_type, normal_balance,
            coa_standard = 'BAS', parent_account, vat_code, metadata = {} } = req.body;

    if (!account_number || !name || !account_type || !normal_balance) {
      return res.status(400).json({ ok: false, error: 'account_number, name, account_type, normal_balance krävs' });
    }
    if (!['asset','liability','equity','revenue','expense'].includes(account_type)) {
      return res.status(400).json({ ok: false, error: 'Ogiltigt account_type' });
    }

    try {
      const { rows } = await pool.query(
        `INSERT INTO ledger_accounts
           (tenant_id, account_number, name, account_type, normal_balance,
            coa_standard, parent_account, vat_code, metadata)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)
         ON CONFLICT (tenant_id, account_number, coa_standard) DO UPDATE
           SET name=EXCLUDED.name, account_type=EXCLUDED.account_type,
               updated_at=NOW()
         RETURNING *`,
        [ctx.tenant_id, account_number, name, account_type, normal_balance,
         coa_standard, parent_account, vat_code, JSON.stringify(metadata)]
      );
      const account = rows[0];
      ctx.entity_id = account.id;
      await writeAudit(ctx, 'created', null, account);
      await hermes.emit('finance.account.created', ctx, { account_number, name, coa_standard });
      res.status(201).json({ ok: true, account });
    } catch (e) {
      res.status(500).json({ ok: false, error: e.message });
    }
  });
}