<?php
/**
 * Helper Functions
 * 
 * @package AffNotice_Core
 */

if (!defined('ABSPATH')) {
    exit;
}

class affnotice_Pro_Helpers
{

    /**
     * Get all gradient presets
     * 
     * @return array
     */
    public static function get_gradients()
    {
        return array(
            1 => array(
                'name' => 'Hyperion (Sunset)',
                'css' => 'linear-gradient(to right, #FF512F, #DD2476)',
                'text_mode' => 'light',
            ),
            2 => array(
                'name' => 'Azure (Trust)',
                'css' => 'linear-gradient(to right, #2193b0, #6dd5ed)',
                'text_mode' => 'light',
            ),
            3 => array(
                'name' => 'Emerald (Growth)',
                'css' => 'linear-gradient(to right, #11998e, #38ef7d)',
                'text_mode' => 'light',
            ),
            4 => array(
                'name' => 'Amethyst (Tech)',
                'css' => 'linear-gradient(to right, #8E2DE2, #4A00E0)',
                'text_mode' => 'light',
            ),
            5 => array(
                'name' => 'Carbon (Neutral)',
                'css' => 'linear-gradient(to right, #232526, #414345)',
                'text_mode' => 'light',
            ),
            6 => array(
                'name' => 'Citrine (Caution)',
                'css' => 'linear-gradient(to right, #F2994A, #F2C94C)',
                'text_mode' => 'dark',
            ),
            7 => array(
                'name' => 'Prism (Light Rainbow)',
                'css' => 'linear-gradient(to right, #ff9a9e, #fecfef, #a18cd1)',
                'text_mode' => 'dark',
            ),
            8 => array(
                'name' => 'Cotton Candy (Pastel)',
                'css' => 'linear-gradient(120deg, #e0c3fc 0%, #8ec5fc 100%)',
                'text_mode' => 'dark',
            ),
            // New Pastel & Modern Gradients
            9 => array(
                'name' => 'Morning Mist (Pastel Cyan)',
                'css' => 'linear-gradient(to right, #a8edea, #fed6e3)',
                'text_mode' => 'dark',
            ),
            10 => array(
                'name' => 'Gentle Glow (Warm)',
                'css' => 'linear-gradient(to right, #ff9a9e, #fad0c4)',
                'text_mode' => 'dark',
            ),
            11 => array(
                'name' => 'Lavender Dream (Purple)',
                'css' => 'linear-gradient(to right, #e6dee9, #afc9e6)',
                'text_mode' => 'dark',
            ),
            12 => array(
                'name' => 'Soft Grass (Nature)',
                'css' => 'linear-gradient(to right, #deecdd, #c1dfc4)',
                'text_mode' => 'dark',
            ),
            13 => array(
                'name' => 'Sunny Morning (Cheerful)',
                'css' => 'linear-gradient(120deg, #f6d365 0%, #fda085 100%)',
                'text_mode' => 'dark',
            ),
            14 => array(
                'name' => 'Rare Wind (Elegant)',
                'css' => 'linear-gradient(to top, #a18cd1 0%, #fbc2eb 100%)',
                'text_mode' => 'dark',
            ),
            15 => array(
                'name' => 'Near Moon (Cool)',
                'css' => 'linear-gradient(to top, #5ee7df 0%, #b490ca 100%)',
                'text_mode' => 'dark',
            ),
            16 => array(
                'name' => 'Wild Apple (Fresh)',
                'css' => 'linear-gradient(to top, #d299c2 0%, #fef9d7 100%)',
                'text_mode' => 'dark',
            ),
            17 => array(
                'name' => 'Saint Petersburg (Classy)',
                'css' => 'linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%)',
                'text_mode' => 'dark',
            ),
            18 => array(
                'name' => 'Plum Plate (Deep)',
                'css' => 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
                'text_mode' => 'light',
            ),
            99 => array(
                'name' => 'Pro: Custom Gradient Configuration',
                'css' => 'linear-gradient(90deg, #cccccc, #999999)',
                'text_mode' => 'light', // Handled dynamically in preview but defaults to light
            ),
        );
    }

    /**
     * Get CSS for a specific gradient ID or Custom
     * 
     * @param int    $id
     * @param string $custom_start
     * @param string $custom_end
     * @return string
     */
    public static function get_gradient_css($id, $custom_start = '', $custom_end = '')
    {
        $gradients = self::get_gradients();

        if (99 === (int) $id) {
            // Pro Feature: Custom Gradient
            // Sanitize hex colors to be safe using internal helper to avoid undefined function errors in REST API
            $start = self::sanitize_hex($custom_start);
            $end = self::sanitize_hex($custom_end);

            // Fallback defaults if empty
            if (!$start)
                $start = '#cccccc';
            if (!$end)
                $end = '#999999';

            return "linear-gradient(90deg, {$start}, {$end})";
        }

        if (isset($gradients[$id])) {
            return $gradients[$id]['css'];
        }

        // Default to preset 1 if not found
        return $gradients[1]['css'];
    }

    /**
     * Sanitizes a hex color.
     * 
     * @param string $color
     * @return string|null
     */
    public static function sanitize_hex($color)
    {
        $color = ltrim($color, '#');
        if (preg_match('/^([A-Fa-f0-9]{3}){1,2}$/', $color)) {
            return '#' . $color;
        }
        return null; // Invalid
    }

    /**
     * Determine text color class based on preset
     * 
     * @param int $id
     * @param string $custom_mode 'auto', 'light', 'dark'
     * @return string
     */
    public static function get_text_color_class($id, $custom_mode = 'auto')
    {
        if (99 === (int) $id) {
            if ('light' === $custom_mode) {
                return 'affnotice-text-light';
            } elseif ('dark' === $custom_mode) {
                return 'affnotice-text-dark';
            }
            // Fallback/Auto for custom could be complex, let's default to dark for safety or make it a setting?
            // PRD says "User Selects" for custom. So we rely on custom_mode.
            return 'affnotice-text-dark';
        }

        $gradients = self::get_gradients();
        if (isset($gradients[$id])) {
            return 'affnotice-text-' . $gradients[$id]['text_mode'];
        }

        return 'affnotice-text-light';
    }
    /**
     * Check if user is premium
     * 
     * @return bool
     */
    public static function is_premium()
    {
        if (function_exists('affnotice_fs')) {
            return affnotice_fs()->is_paying();
        }
        return false;
    }
}