<?php
/**
 * Base Class for Additional Checkout Fields
 */

if (!defined('ABSPATH')) {
    exit;
}

abstract class EnspirePlugins_ACFW_Base {
    
    protected $custom_fields = array();
    
    /**
     * Load custom fields settings
     */
    protected function load_settings() {
        $settings = get_option('enspireplugins_acfw_settings', array());
        $this->custom_fields = isset($settings['custom_fields']) ? $settings['custom_fields'] : array();
    }
    
    /**
     * Get active fields
     */
    protected function get_active_fields() {
        return array_filter($this->custom_fields, function($field) {
            return isset($field['active']) && $field['active'] === 'yes';
        });
    }
    
    /**
     * Process options for select/radio fields (common logic)
     */
    protected function process_field_options($field) {
        $options = array();
        
        if (isset($field['options']) && !empty($field['options'])) {
            if (is_array($field['options'])) {
                foreach ($field['options'] as $option) {
                    if (is_array($option)) {
                        $value = isset($option['value']) ? $option['value'] : (isset($option['label']) ? $option['label'] : '');
                        $label = isset($option['label']) ? $option['label'] : (isset($option['value']) ? $option['value'] : '');
                    } else {
                        $value = $label = $option;
                    }
                    if (!empty($value)) {
                        $options[$value] = $label;
                    }
                }
            } elseif (is_string($field['options'])) {
                $decoded_options = json_decode($field['options'], true);
                if (json_last_error() === JSON_ERROR_NONE && is_array($decoded_options)) {
                    foreach ($decoded_options as $option) {
                        if (is_array($option)) {
                            $value = isset($option['value']) ? $option['value'] : (isset($option['label']) ? $option['label'] : '');
                            $label = isset($option['label']) ? $option['label'] : (isset($option['value']) ? $option['value'] : '');
                        } else {
                            $value = $label = $option;
                        }
                        if (!empty($value)) {
                            $options[$value] = $label;
                        }
                    }
                } else {
                    $string_options = preg_split('/[\r\n,]+/', $field['options']);
                    foreach ($string_options as $option) {
                        $option = trim($option);
                        if (!empty($option)) {
                            $options[$option] = $option;
                        }
                    }
                }
            }
        }
        
        return $options;
    }
    
    /**
     * Sanitize POST value for a field
     */
    protected function get_sanitized_post_value($value, $type) {
        if (is_array($value)) {
            return array_map('sanitize_text_field', array_map('wp_unslash', $value));
        } else {
            return sanitize_text_field(wp_unslash($value));
        }
    }
    
    /**
     * Sanitize field value based on its type
     */
    protected function sanitize_field_value($value, $type) {
        switch ($type) {
            case 'email':
                return sanitize_email($value);
            
            case 'url':
                return esc_url_raw($value);
            
            case 'number':
                return is_numeric($value) ? floatval($value) : '';
            
            case 'textarea':
                return sanitize_textarea_field($value);
            
            case 'checkbox':
                return $value ? 'yes' : 'no';
            
            case 'select':
            case 'radio':
                return sanitize_text_field($value);
            
            default:
                return sanitize_text_field($value);
        }
    }
    
    /**
     * Validate field value based on its type
     */
    protected function validate_field_value($value, $type) {
        switch ($type) {
            case 'email':
                return empty($value) || is_email($value);
            
            case 'url':
                return empty($value) || filter_var($value, FILTER_VALIDATE_URL);
            
            case 'number':
                return empty($value) || is_numeric($value);
            
            case 'checkbox':
                return in_array($value, array('yes', 'no', '1', '0', 1, 0, true, false), true);
            
            default:
                return true;
        }
    }
    
    /**
     * Format value for display
     */
    protected function format_field_value_for_display($value, $type) {
        switch ($type) {
            case 'checkbox':
                return ($value === 'yes' || $value === '1') ? 
                    esc_html__('Yes', 'additional-checkout-fields-for-woo') : 
                    esc_html__('No', 'additional-checkout-fields-for-woo');
            
            case 'url':
                return '<a href="' . esc_url($value) . '" target="_blank">' . esc_html($value) . '</a>';
            
            default:
                return esc_html($value);
        }
    }
    
    /**
     * Save custom fields to order meta
     */
    protected function save_fields_to_order($order, $data_source = 'POST') {
        if (empty($this->custom_fields)) {
            return;
        }
        
        if (!$order) {
            return;
        }
        
        try {
            $saved_count = 0;
            foreach ($this->custom_fields as $field) {
                if (isset($field['active']) && $field['active'] === 'yes' && $field['type'] !== 'heading') {
                    $field_id = 'enspireplugins_acfw_' . $field['id'];
                    $raw_value = null;
                    
                    // Get value based on data source
                    if ($data_source === 'POST' && isset($_POST[$field_id])) { // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verification is handled by WooCommerce checkout process
                        $raw_value = $this->get_sanitized_post_value(
                            sanitize_text_field(wp_unslash($_POST[$field_id])), // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verification is handled by WooCommerce checkout process
                            $field['type']
                        );
                    } elseif (is_array($data_source) && isset($data_source[$field_id])) {
                        $raw_value = $data_source[$field_id];
                    }
                    
                    if ($raw_value !== null && (!empty($raw_value) || $field['type'] === 'checkbox')) {
                        $field_value = $this->sanitize_field_value($raw_value, $field['type']);
                        
                        if ($this->validate_field_value($field_value, $field['type'])) {
                            // Save ONLY with field_id as in the classic version
                            $order->update_meta_data($field_id, $field_value);
                            $saved_count++;
                        }
                    }
                }
            }
            
            if ($saved_count > 0) {
                $order->save();
            }
            
        } catch (Exception $e) {
            // Silent error handling
        }
    }
    
    /**
     * Get active fields for editor/frontend
     */
    protected function get_active_fields_for_editor() {
        $active_fields = $this->get_active_fields();
        $editor_fields = array();
        
        foreach ($active_fields as $field) {
            $editor_fields[] = array(
                'id' => isset($field['id']) ? $field['id'] : '',
                'label' => isset($field['label']) ? $field['label'] : '',
                'type' => isset($field['type']) ? $field['type'] : 'text',
                'required' => isset($field['required']) && $field['required'] === 'yes',
                'placeholder' => isset($field['placeholder']) ? $field['placeholder'] : '',
                'options' => isset($field['options']) ? $field['options'] : array(),
            );
        }
        
        return $editor_fields;
    }
    
    /**
     * Render a heading field (common logic)
     */
    protected function render_heading_field($field) {
        echo '<div class="enspireplugins_acfw-heading-field">';
        echo '<h3 class="enspireplugins_acfw-field-heading">' . esc_html($field['label']) . '</h3>';
        echo '</div>';
    }
}