<?php

namespace App\Models;

use App\Core\Security;

/**
 * WhatsAppSession Model
 * Handles the whatsapp_sessions table with encryption for phone and QR code.
 */
class WhatsAppSession extends BaseModel
{
    protected string $table = 'whatsapp_sessions';

    /**
     * Get the session for a specific company
     */
    public function findByCompany(int $companyId)
    {
        $session = $this->db->query(
            "SELECT * FROM {$this->table} WHERE company_id = ? LIMIT 1",
            [$companyId]
        )->fetch();

        if ($session) {
            $session['phone'] = $session['phone'] ? Security::decrypt($session['phone']) : null;
            $session['qr_code'] = $session['qr_code'] ? Security::decrypt($session['qr_code']) : null;
        }

        return $session;
    }

    /**
     * Get a session by session_key (used by webhooks)
     */
    public function findBySessionKey(string $sessionKey)
    {
        $session = $this->db->query(
            "SELECT * FROM {$this->table} WHERE session_key = ? LIMIT 1",
            [$sessionKey]
        )->fetch();

        if ($session) {
            $session['phone'] = $session['phone'] ? Security::decrypt($session['phone']) : null;
            $session['qr_code'] = $session['qr_code'] ? Security::decrypt($session['qr_code']) : null;
        }

        return $session;
    }

    /**
     * Create or retrieve a new session for a company
     */
    public function findOrCreate(int $companyId, string $name = 'Main WhatsApp')
    {
        $session = $this->findByCompany($companyId);
        if ($session) {
            return $session;
        }

        $sessionKey = 'cmp_' . $companyId . '_' . bin2hex(random_bytes(4));

        $id = $this->create([
            'company_id' => $companyId,
            'name' => $name,
            'session_key' => $sessionKey,
            'status' => 'disconnected'
        ]);

        return $this->findByCompany($companyId);
    }

    /**
     * Update session state securely
     */
    public function updateState(int $id, array $data)
    {
        if (isset($data['phone'])) {
            $data['phone_hash'] = Security::blindIndex($data['phone']);
            $data['phone'] = Security::encrypt($data['phone']);
        }

        if (isset($data['qr_code'])) {
            $data['qr_code'] = Security::encrypt($data['qr_code']);
        }

        return $this->update($id, $data);
    }
}