<?php
/*
Plugin Name: Advanced Content Copy
Plugin URI: https://wordpress.org/plugins/advanced-content-copy/
Description: Modifies the copied content with customizable text, link, and snippet options when pasted elsewhere.
Version: 1.2
Author: The AV Coach
Author URI: https://theavcoach.com/
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: advanced-content-copy
*/

// Security check
if (!defined('ABSPATH')) {
    exit;
}

// Plugin constants
define('ADVACOCO_VERSION', '1.2');
define('ADVACOCO_PLUGIN_DIR', plugin_dir_path(__FILE__));
define('ADVACOCO_PLUGIN_URL', plugin_dir_url(__FILE__));

if (!class_exists('ADVACOCO_Plugin')) {
    class ADVACOCO_Plugin {
        private $option_group = 'advacoco_settings';
        private $nonce = 'advacoco_nonce';
        private $capability = 'manage_options';

        public function __construct() {
            add_action('admin_menu', [$this, 'register_settings_page']);
            add_action('admin_init', [$this, 'register_settings']);
            add_action('wp_enqueue_scripts', [$this, 'enqueue_frontend_scripts']);
            add_action('admin_enqueue_scripts', [$this, 'enqueue_admin_scripts']);
            register_deactivation_hook(__FILE__, [$this, 'deactivate']);
        }

        public function deactivate() {
            // Clear any saved options if needed
            delete_option('advacoco_enabled');
            delete_option('advacoco_snippet_length');
            delete_option('advacoco_prefix_text');
            delete_option('advacoco_suffix_text');
            delete_option('advacoco_domain_text');
            delete_option('advacoco_exclude_pages');
            delete_option('advacoco_min_chars');
            delete_option('advacoco_ignore_code_blocks');
        }

        public function register_settings_page() {
            add_options_page(
                'Advanced Content Copy Settings',
                'Advanced Copy',
                $this->capability,
                'advanced-copy-settings',
                [$this, 'settings_page_html']
            );
        }

        public function register_settings() {
            register_setting($this->option_group, 'advacoco_enabled', [
                'default' => 1,
                'sanitize_callback' => 'intval'
            ]);
            register_setting($this->option_group, 'advacoco_snippet_length', [
                'default' => 100,
                'sanitize_callback' => [$this, 'sanitize_snippet_length']
            ]);
            register_setting($this->option_group, 'advacoco_prefix_text', [
                'default' => 'This excerpt was copied from',
                'sanitize_callback' => 'sanitize_text_field'
            ]);
            register_setting($this->option_group, 'advacoco_suffix_text', [
                'default' => 'learn more at:',
                'sanitize_callback' => 'sanitize_text_field'
            ]);
            register_setting($this->option_group, 'advacoco_domain_text', [
                'default' => '',
                'sanitize_callback' => 'sanitize_text_field'
            ]);
            register_setting($this->option_group, 'advacoco_exclude_pages', [
                'default' => '',
                'sanitize_callback' => 'sanitize_textarea_field'
            ]);
            register_setting($this->option_group, 'advacoco_min_chars', [
                'default' => 20,
                'sanitize_callback' => [$this, 'sanitize_min_chars']
            ]);
            register_setting($this->option_group, 'advacoco_ignore_code_blocks', [
                'default' => 1,
                'sanitize_callback' => 'intval'
            ]);
        }

        public function sanitize_snippet_length($value) {
            $value = intval($value);
            return max(10, min(500, $value));
        }

        public function sanitize_min_chars($value) {
            $value = intval($value);
            return max(1, min(100, $value));
        }

        public function settings_page_html() {
            if (!current_user_can($this->capability)) {
                wp_die(esc_html__('You do not have sufficient permissions to access this page.', 'advanced-content-copy'));
            }

            ?>
            <div class="wrap advacoco-settings">
                <h1><?php echo esc_html__('Advanced Content Copy Settings', 'advanced-content-copy'); ?></h1>
                <?php if (isset($_GET['settings-updated']) && wp_verify_nonce(sanitize_text_field(wp_unslash($_GET['_wpnonce'] ?? '')), 'update-options')) : ?>
                    <div class="notice notice-success is-dismissible">
                        <p><?php echo esc_html__('Settings saved successfully.', 'advanced-content-copy'); ?></p>
                    </div>
                <?php endif; ?>
                <form method="post" action="options.php">
                    <?php
                    settings_fields($this->option_group);
                    ?>
                    <table class="form-table">
                        <tr>
                            <th><?php echo esc_html__('Enable Copy Modification', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="checkbox" name="advacoco_enabled" value="1" <?php checked(get_option('advacoco_enabled'), 1); ?>>
                                <p class="description"><?php echo esc_html__('Enable/disable the copy modification functionality', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Snippet Length', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="number" name="advacoco_snippet_length" value="<?php echo esc_attr(get_option('advacoco_snippet_length', 100)); ?>" min="10" max="500">
                                <p class="description"><?php echo esc_html__('Number of characters to show before "..." (10-500)', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Prefix Text', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="text" name="advacoco_prefix_text" value="<?php echo esc_attr(get_option('advacoco_prefix_text', 'This excerpt was copied from')); ?>" size="40">
                                <p class="description"><?php echo esc_html__('Text to appear before the domain name', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Suffix Text', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="text" name="advacoco_suffix_text" value="<?php echo esc_attr(get_option('advacoco_suffix_text', 'learn more at:')); ?>" size="40">
                                <p class="description"><?php echo esc_html__('Text to appear before the URL', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Domain Text', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="text" name="advacoco_domain_text" value="<?php echo esc_attr(get_option('advacoco_domain_text', '')); ?>" size="40">
                                <p class="description"><?php echo esc_html__('Custom domain text to display (leave empty for actual domain)', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Minimum Characters', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="number" name="advacoco_min_chars" value="<?php echo esc_attr(get_option('advacoco_min_chars', 20)); ?>" min="1" max="100">
                                <p class="description"><?php echo esc_html__('Minimum number of characters needed to trigger copy modification (1-100)', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Ignore Code Blocks', 'advanced-content-copy'); ?></th>
                            <td>
                                <input type="checkbox" name="advacoco_ignore_code_blocks" value="1" <?php checked(get_option('advacoco_ignore_code_blocks', 1), 1); ?>>
                                <p class="description"><?php echo esc_html__('When enabled, text copied from inside <pre> or <code> elements (code/script blocks) is left untouched, without attribution added, so it can be pasted exactly as written.', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php echo esc_html__('Exclude Pages', 'advanced-content-copy'); ?></th>
                            <td>
                                <textarea name="advacoco_exclude_pages" rows="3" cols="50"><?php echo esc_textarea(get_option('advacoco_exclude_pages', '')); ?></textarea>
                                <p class="description"><?php echo esc_html__('Page IDs or slugs to exclude (comma-separated)', 'advanced-content-copy'); ?></p>
                            </td>
                        </tr>
                    </table>
                    <?php submit_button(__('Save Settings', 'advanced-content-copy')); ?>
                </form>
            </div>
            <?php
        }

        public function enqueue_admin_scripts($hook) {
            if ($hook != 'settings_page_advanced-copy-settings') {
                return;
            }

            wp_enqueue_style('advacoco-admin', ADVACOCO_PLUGIN_URL . 'assets/css/admin.css', [], ADVACOCO_VERSION);
        }

        public function enqueue_frontend_scripts() {
            // Check if copy modification is enabled
            if (!get_option('advacoco_enabled', 1)) {
                return;
            }

            // Check if current page should be excluded
            if ($this->should_exclude_page()) {
                return;
            }

            // Register and enqueue the main script
            wp_register_script(
                'advacoco-frontend',
                ADVACOCO_PLUGIN_URL . 'assets/js/advanced-content-copy.js',
                [],
                ADVACOCO_VERSION,
                true
            );

            // Prepare settings for JavaScript
            $settings = [
                'snippetLength' => intval(get_option('advacoco_snippet_length', 100)),
                'minChars' => intval(get_option('advacoco_min_chars', 20)),
                'prefix' => get_option('advacoco_prefix_text', 'This excerpt was copied from'),
                'suffix' => get_option('advacoco_suffix_text', 'learn more at:'),
                'domain' => get_option('advacoco_domain_text', '') ?: get_bloginfo('name'),
                'postUrl' => $this->get_appropriate_url(),
                'ignoreCodeBlocks' => intval(get_option('advacoco_ignore_code_blocks', 1)),
                'bypassSelectors' => $this->get_bypass_selectors()
            ];

            // Localize the script with settings
            wp_localize_script('advacoco-frontend', 'advacocoSettings', $settings);

            // Enqueue the script
            wp_enqueue_script('advacoco-frontend');
        }

        public function should_exclude_page() {
            $exclude_pages = trim(get_option('advacoco_exclude_pages', ''));
            if (empty($exclude_pages)) {
                return false;
            }

            $current_id = get_the_ID();
            $current_slug = get_post_field('post_name', $current_id);
            
            $excluded = array_map('trim', explode(',', $exclude_pages));
            
            return in_array($current_id, $excluded) || in_array($current_slug, $excluded);
        }

        /**
         * Get the list of CSS selectors whose content should bypass copy
         * modification entirely (e.g. code and script blocks).
         *
         * Only applied when the "Ignore Code Blocks" setting is enabled.
         * Developers can add, remove, or override selectors with:
         *
         *   add_filter('advacoco_bypass_selectors', function($selectors) {
         *       $selectors[] = '.my-custom-code-class';
         *       return $selectors;
         *   });
         *
         * @return array Array of CSS selector strings.
         */
        public function get_bypass_selectors() {
            $selectors = ['pre', 'code'];

            /**
             * Filters the CSS selectors exempted from copy modification.
             *
             * @param array $selectors Default: ['pre', 'code'].
             */
            return apply_filters('advacoco_bypass_selectors', $selectors);
        }

        /**
         * Get the appropriate URL based on the current page type
         * 
         * @return string The URL to use for attribution
         */
        public function get_appropriate_url() {
            // Check if we're on a single post/page
            if (is_singular()) {
                return get_permalink();
            }
            
            // Check if we're on a category page
            if (is_category()) {
                $category = get_queried_object();
                return get_category_link($category->term_id);
            }
            
            // Check if we're on a tag page
            if (is_tag()) {
                $tag = get_queried_object();
                return get_tag_link($tag->term_id);
            }
            
            // Check if we're on a custom taxonomy archive
            if (is_tax()) {
                $term = get_queried_object();
                return get_term_link($term);
            }
            
            // Check if we're on an author page
            if (is_author()) {
                $author_id = get_queried_object_id();
                return get_author_posts_url($author_id);
            }
            
            // Check if we're on a date archive
            if (is_date()) {
                if (is_year()) {
                    return get_year_link(get_query_var('year'));
                } elseif (is_month()) {
                    return get_month_link(get_query_var('year'), get_query_var('monthnum'));
                } elseif (is_day()) {
                    return get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day'));
                }
            }
            
            // Check if we're on the blog posts page
            if (is_home() && !is_front_page()) {
                return get_permalink(get_option('page_for_posts'));
            }
            
            // Check if we're on a search results page
            if (is_search()) {
                return home_url('/?s=' . urlencode(get_search_query()));
            }
            
            // Fallback to current page URL
            return home_url(add_query_arg(null, null));
        }
    }
}

new ADVACOCO_Plugin();