<?php
/**
 * Helper functions for AD Pro Forms
 *
 * @package ADProForms
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * Register a form configuration
 *
 * Example usage:
 * adpf_register_form('contact', array(
 *     'fields' => array(
 *         array('type' => 'text', 'name' => 'name', 'label' => 'Nom', 'required' => true),
 *         array('type' => 'email', 'name' => 'email', 'label' => 'Email', 'required' => true),
 *         array('type' => 'textarea', 'name' => 'message', 'label' => 'Message', 'required' => true),
 *         array('type' => 'submit', 'name' => 'submit', 'label' => 'Send'),
 *     ),
 * ));
 *
 * @param string $form_id Unique form identifier
 * @param array $config Form configuration array
 */
function adpf_register_form($form_id, $config) {
    add_filter('adpf_form_config_' . $form_id, function() use ($config) {
        return $config;
    });
}

/**
 * Get form configuration
 *
 * @param string $form_id Form ID
 * @return array|false Form configuration or false
 */
function adpf_get_form_config($form_id) {
    return apply_filters('adpf_form_config_' . $form_id, false);
}

/**
 * Lighten a hex color by mixing it toward white by the given percentage.
 *
 * @param string $hex     Hex color (with or without leading #).
 * @param int    $percent 0–100. Higher = closer to white.
 * @return string Lightened hex color with leading #.
 */
function adpf_lighten_color($hex, $percent = 20) {
    $hex = ltrim($hex, '#');
    if (strlen($hex) === 3) {
        $hex = str_repeat($hex[0], 2) . str_repeat($hex[1], 2) . str_repeat($hex[2], 2);
    }
    if (strlen($hex) !== 6) {
        return '#' . $hex;
    }
    $r = hexdec(substr($hex, 0, 2));
    $g = hexdec(substr($hex, 2, 2));
    $b = hexdec(substr($hex, 4, 2));
    $r = (int) min(255, round($r + (255 - $r) * $percent / 100));
    $g = (int) min(255, round($g + (255 - $g) * $percent / 100));
    $b = (int) min(255, round($b + (255 - $b) * $percent / 100));
    return sprintf('#%02x%02x%02x', $r, $g, $b);
}

/**
 * Get the upgrade URL for the Pro version
 *
 * @return string URL to the Pro version page
 */
function adpf_get_upgrade_url() {
    if (function_exists('adpf_fs_integration')) {
        $upgrade_url = adpf_fs_integration()->get_upgrade_url();
        if (!empty($upgrade_url)) {
            return $upgrade_url;
        }
    }
    return admin_url('admin.php?page=ad-pro-forms-menu-pricing');
}