<?php
/**
 * Admin Class
 * 
 * Handles the admin settings page and meta box for manual exclusion.
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

class WP_To_HTML_Admin {
    
    /**
     * Single instance
     */
    private static $instance = null;
    
    /**
     * Get singleton instance
     */
    public static function get_instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    /**
     * Constructor
     */
    private function __construct() {
        add_action('admin_menu', array($this, 'add_admin_menu'));
        add_action('admin_init', array($this, 'register_settings'));
        add_action('add_meta_boxes', array($this, 'add_meta_box'));
        add_action('save_post', array($this, 'save_meta_box'), 10, 2);
        add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_assets'));
        
        // AJAX endpoint for regeneration status
        add_action('wp_ajax_wp_to_html_get_status', array($this, 'ajax_get_status'));
    }
    
    /**
     * Add admin menu
     */
    public function add_admin_menu() {
        add_options_page(
            __('WP to HTML Settings', 'wp-to-html'),
            __('WP to HTML', 'wp-to-html'),
            'manage_options',
            'wp-to-html',
            array($this, 'render_settings_page')
        );
    }
    
    /**
     * Register settings
     */
    public function register_settings() {
        register_setting('wp_to_html_settings', 'wp_to_html_settings', array($this, 'sanitize_settings'));
        
        // General Settings Section
        add_settings_section(
            'wp_to_html_general',
            __('General Settings', 'wp-to-html'),
            array($this, 'render_general_section'),
            'wp-to-html'
        );
        
        add_settings_field(
            'enabled',
            __('Enable Static HTML Generation', 'wp-to-html'),
            array($this, 'render_enabled_field'),
            'wp-to-html',
            'wp_to_html_general'
        );
        
        // Exclusion Settings Section
        add_settings_section(
            'wp_to_html_exclusions',
            __('Exclusion Settings', 'wp-to-html'),
            array($this, 'render_exclusions_section'),
            'wp-to-html'
        );
        
        add_settings_field(
            'excluded_shortcodes',
            __('Excluded Shortcodes', 'wp-to-html'),
            array($this, 'render_shortcodes_field'),
            'wp-to-html',
            'wp_to_html_exclusions'
        );
        
        add_settings_field(
            'excluded_blocks',
            __('Excluded Blocks', 'wp-to-html'),
            array($this, 'render_blocks_field'),
            'wp-to-html',
            'wp_to_html_exclusions'
        );
        
        // Cron Settings Section
        add_settings_section(
            'wp_to_html_cron',
            __('Scheduled Regeneration', 'wp-to-html'),
            array($this, 'render_cron_section'),
            'wp-to-html'
        );
        
        add_settings_field(
            'cron_interval',
            __('Regeneration Schedule', 'wp-to-html'),
            array($this, 'render_cron_field'),
            'wp-to-html',
            'wp_to_html_cron'
        );
        
        // Performance Settings Section
        add_settings_section(
            'wp_to_html_performance',
            __('Performance Settings', 'wp-to-html'),
            array($this, 'render_performance_section'),
            'wp-to-html'
        );
        
        add_settings_field(
            'bundle_css',
            __('Bundle CSS Files', 'wp-to-html'),
            array($this, 'render_bundle_css_field'),
            'wp-to-html',
            'wp_to_html_performance'
        );
        
        add_settings_field(
            'bundle_js',
            __('Bundle JavaScript Files', 'wp-to-html'),
            array($this, 'render_bundle_js_field'),
            'wp-to-html',
            'wp_to_html_performance'
        );
        
        // Cache Info Section
        add_settings_section(
            'wp_to_html_cache',
            __('Cache Information', 'wp-to-html'),
            array($this, 'render_cache_section'),
            'wp-to-html'
        );
    }
    
    /**
     * Sanitize settings
     */
    public function sanitize_settings($input) {
        $sanitized = array();
        
        $sanitized['enabled'] = isset($input['enabled']) ? (bool) $input['enabled'] : false;
        $sanitized['excluded_shortcodes'] = isset($input['excluded_shortcodes']) 
            ? sanitize_text_field($input['excluded_shortcodes']) 
            : '';
        $sanitized['excluded_blocks'] = isset($input['excluded_blocks']) 
            ? sanitize_text_field($input['excluded_blocks']) 
            : '';
        
        // Sanitize cron interval
        $valid_intervals = array('disabled', 'wp_to_html_hourly', 'wp_to_html_twicedaily', 'daily');
        $sanitized['cron_interval'] = isset($input['cron_interval']) && in_array($input['cron_interval'], $valid_intervals)
            ? $input['cron_interval']
            : 'wp_to_html_hourly';
        
        // Sanitize bundling options
        $sanitized['bundle_css'] = isset($input['bundle_css']) ? (bool) $input['bundle_css'] : false;
        $sanitized['bundle_js'] = isset($input['bundle_js']) ? (bool) $input['bundle_js'] : false;
        
        // Reschedule cron if interval changed
        $current_settings = WP_To_HTML::get_settings();
        if (!isset($current_settings['cron_interval']) || $current_settings['cron_interval'] !== $sanitized['cron_interval']) {
            WP_To_HTML_Cron::reschedule_cron($sanitized['cron_interval']);
        }
        
        return $sanitized;
    }
    
    /**
     * Enqueue admin assets
     */
    public function enqueue_admin_assets($hook) {
        if ($hook === 'settings_page_wp-to-html') {
            wp_enqueue_style(
                'wp-to-html-admin',
                WP_TO_HTML_PLUGIN_URL . 'admin/css/admin.css',
                array(),
                WP_TO_HTML_VERSION
            );
            
            wp_enqueue_script(
                'wp-to-html-admin',
                WP_TO_HTML_PLUGIN_URL . 'admin/js/admin.js',
                array('jquery'),
                WP_TO_HTML_VERSION,
                true
            );
            
            wp_localize_script('wp-to-html-admin', 'wpToHtml', array(
                'ajaxUrl' => admin_url('admin-ajax.php'),
                'nonce' => wp_create_nonce('wp_to_html_bulk'),
                'statusNonce' => wp_create_nonce('wp_to_html_status'),
                'strings' => array(
                    'processing' => __('Processing...', 'wp-to-html'),
                    'complete' => __('Complete!', 'wp-to-html'),
                    'error' => __('An error occurred', 'wp-to-html'),
                    'confirmClear' => __('Are you sure you want to clear all cached HTML files?', 'wp-to-html'),
                    'statusIdle' => __('No regeneration in progress', 'wp-to-html'),
                    'statusRunning' => __('Regeneration in progress...', 'wp-to-html'),
                    'statusPending' => __('Waiting to start...', 'wp-to-html'),
                    'statusComplete' => __('Regeneration complete', 'wp-to-html'),
                    'sourceCron' => __('(Scheduled Task)', 'wp-to-html'),
                    'sourceAdminBar' => __('(Admin Bar)', 'wp-to-html'),
                    'sourcePluginUpdate' => __('(Plugin Update)', 'wp-to-html'),
                    'sourceSettingsPage' => __('(Settings Page)', 'wp-to-html'),
                ),
            ));
        }
    }
    
    /**
     * Render settings page
     */
    public function render_settings_page() {
        if (!current_user_can('manage_options')) {
            return;
        }
        
        // Check if cache was just cleared
        if (isset($_GET['cache_cleared']) && $_GET['cache_cleared'] === '1') {
            add_settings_error('wp_to_html', 'cache_cleared', __('Cache cleared successfully.', 'wp-to-html'), 'success');
        }
        
        ?>
        <div class="wrap">
            <h1><?php echo esc_html(get_admin_page_title()); ?></h1>
            
            <?php settings_errors('wp_to_html'); ?>
            
            <div class="wp-to-html-admin-container">
                <div class="wp-to-html-main">
                    <form action="options.php" method="post">
                        <?php
                        settings_fields('wp_to_html_settings');
                        do_settings_sections('wp-to-html');
                        submit_button(__('Save Settings', 'wp-to-html'));
                        ?>
                    </form>
                </div>
                
                <div class="wp-to-html-sidebar">
                    <div class="wp-to-html-card">
                        <h3><?php _e('Bulk Actions', 'wp-to-html'); ?></h3>
                        <p><?php _e('Generate or clear cached HTML files in bulk.', 'wp-to-html'); ?></p>
                        
                        <div class="wp-to-html-bulk-actions">
                            <button type="button" class="button button-primary" id="wp-to-html-convert-all">
                                <?php _e('Convert All Pages & Posts', 'wp-to-html'); ?>
                            </button>
                            
                            <button type="button" class="button button-secondary" id="wp-to-html-clear-cache">
                                <?php _e('Clear All Cache', 'wp-to-html'); ?>
                            </button>
                        </div>
                        
                        <div id="wp-to-html-progress" style="display: none;">
                            <div class="wp-to-html-progress-bar">
                                <div class="wp-to-html-progress-fill"></div>
                            </div>
                            <p class="wp-to-html-progress-text"></p>
                        </div>
                        
                        <div id="wp-to-html-results" style="display: none;"></div>
                    </div>
                    
                    <div class="wp-to-html-card" id="wp-to-html-status-card">
                        <h3><?php _e('Regeneration Status', 'wp-to-html'); ?></h3>
                        <div id="wp-to-html-live-status">
                            <?php 
                            $status = WP_To_HTML_Cron::get_regeneration_status();
                            if ($status && in_array($status['status'], array('running', 'pending'))): 
                            ?>
                            <div class="status-running">
                                <span class="dashicons dashicons-update spin"></span>
                                <span class="status-text">
                                    <?php echo $status['status'] === 'pending' 
                                        ? __('Waiting to start...', 'wp-to-html') 
                                        : __('Regeneration in progress...', 'wp-to-html'); ?>
                                </span>
                                <?php if (isset($status['source'])): ?>
                                <span class="status-source">
                                    <?php 
                                    $sources = array(
                                        'cron' => __('(Scheduled Task)', 'wp-to-html'),
                                        'admin_bar' => __('(Admin Bar)', 'wp-to-html'),
                                        'plugin_update' => __('(Plugin Update)', 'wp-to-html'),
                                        'settings_page' => __('(Settings Page)', 'wp-to-html'),
                                    );
                                    echo isset($sources[$status['source']]) ? $sources[$status['source']] : '';
                                    ?>
                                </span>
                                <?php endif; ?>
                                <?php if (isset($status['total']) && $status['total'] > 0): ?>
                                <div class="status-progress">
                                    <?php printf(__('%d / %d pages processed', 'wp-to-html'), $status['processed'], $status['total']); ?>
                                </div>
                                <?php endif; ?>
                            </div>
                            <?php elseif ($status && $status['status'] === 'complete'): ?>
                            <div class="status-complete">
                                <span class="dashicons dashicons-yes-alt"></span>
                                <span class="status-text"><?php _e('Last regeneration complete', 'wp-to-html'); ?></span>
                                <div class="status-details">
                                    <?php printf(__('%d converted, %d skipped, %d errors', 'wp-to-html'), 
                                        $status['converted'], $status['skipped'], $status['errors']); ?>
                                </div>
                            </div>
                            <?php else: ?>
                            <div class="status-idle">
                                <span class="dashicons dashicons-clock"></span>
                                <span class="status-text"><?php _e('No regeneration in progress', 'wp-to-html'); ?></span>
                            </div>
                            <?php endif; ?>
                        </div>
                    </div>
                    
                    <div class="wp-to-html-card">
                        <h3><?php _e('Server Configuration', 'wp-to-html'); ?></h3>
                        <p><?php _e('For Nginx servers, add this to your server configuration:', 'wp-to-html'); ?></p>
                        <pre class="wp-to-html-code"><?php echo esc_html($this->get_nginx_rules()); ?></pre>
                    </div>
                </div>
            </div>
        </div>
        <?php
    }
    
    /**
     * Render general section description
     */
    public function render_general_section() {
        echo '<p>' . __('Configure the main settings for static HTML generation.', 'wp-to-html') . '</p>';
    }
    
    /**
     * Render enabled field
     */
    public function render_enabled_field() {
        $settings = WP_To_HTML::get_settings();
        ?>
        <label>
            <input type="checkbox" name="wp_to_html_settings[enabled]" value="1" 
                   <?php checked($settings['enabled'], true); ?>>
            <?php _e('Enable static HTML generation for pages and posts', 'wp-to-html'); ?>
        </label>
        <p class="description">
            <?php _e('When enabled, pages and posts will be converted to static HTML files for faster loading.', 'wp-to-html'); ?>
        </p>
        <?php
    }
    
    /**
     * Render exclusions section description
     */
    public function render_exclusions_section() {
        echo '<p>' . __('Configure which pages should be excluded from static HTML generation.', 'wp-to-html') . '</p>';
    }
    
    /**
     * Render shortcodes field
     */
    public function render_shortcodes_field() {
        $settings = WP_To_HTML::get_settings();
        ?>
        <input type="text" name="wp_to_html_settings[excluded_shortcodes]" 
               value="<?php echo esc_attr($settings['excluded_shortcodes']); ?>" 
               class="large-text">
        <p class="description">
            <?php _e('Comma-separated list of shortcodes. Pages containing these shortcodes will not be converted to static HTML.', 'wp-to-html'); ?>
            <br>
            <?php _e('Example: contact-form-7, wpforms, gravityform', 'wp-to-html'); ?>
        </p>
        <?php
    }
    
    /**
     * Render blocks field
     */
    public function render_blocks_field() {
        $settings = WP_To_HTML::get_settings();
        ?>
        <input type="text" name="wp_to_html_settings[excluded_blocks]" 
               value="<?php echo esc_attr($settings['excluded_blocks']); ?>" 
               class="large-text">
        <p class="description">
            <?php _e('Comma-separated list of Gutenberg block names or partial names. Pages containing these blocks will not be converted to static HTML.', 'wp-to-html'); ?>
            <br>
            <?php _e('Example: wpforms, gravityforms, contact-form-7, ninja-forms', 'wp-to-html'); ?>
        </p>
        <p class="description">
            <strong><?php _e('Automatic exclusions:', 'wp-to-html'); ?></strong>
            <?php _e('Pages with comments enabled and WooCommerce pages (cart, checkout, my account, products) are automatically excluded.', 'wp-to-html'); ?>
        </p>
        <?php
    }
    
    /**
     * Render cron section description
     */
    public function render_cron_section() {
        echo '<p>' . __('Configure automatic regeneration of stale cached pages.', 'wp-to-html') . '</p>';
    }
    
    /**
     * Render cron interval field
     */
    public function render_cron_field() {
        $settings = WP_To_HTML::get_settings();
        $current_interval = isset($settings['cron_interval']) ? $settings['cron_interval'] : 'wp_to_html_hourly';
        
        $intervals = array(
            'disabled'              => __('Disabled', 'wp-to-html'),
            'wp_to_html_hourly'     => __('Every Hour', 'wp-to-html'),
            'wp_to_html_twicedaily' => __('Twice Daily', 'wp-to-html'),
            'daily'                 => __('Daily', 'wp-to-html'),
        );
        ?>
        <select name="wp_to_html_settings[cron_interval]">
            <?php foreach ($intervals as $value => $label): ?>
                <option value="<?php echo esc_attr($value); ?>" <?php selected($current_interval, $value); ?>>
                    <?php echo esc_html($label); ?>
                </option>
            <?php endforeach; ?>
        </select>
        <p class="description">
            <?php _e('How often to check for and regenerate stale cached pages. Only pages that have been modified since their last cache will be regenerated.', 'wp-to-html'); ?>
        </p>
        <?php
        // Show next scheduled run
        $next_run = WP_To_HTML_Cron::get_next_run();
        $last_run = WP_To_HTML_Cron::get_last_run();
        
        if ($next_run): ?>
        <p class="description">
            <strong><?php _e('Next scheduled run:', 'wp-to-html'); ?></strong>
            <?php echo esc_html(date_i18n(get_option('date_format') . ' ' . get_option('time_format'), $next_run)); ?>
        </p>
        <?php endif;
        
        if ($last_run): ?>
        <p class="description">
            <strong><?php _e('Last run:', 'wp-to-html'); ?></strong>
            <?php echo esc_html($last_run['time']); ?> 
            (<?php printf(__('%d pages regenerated', 'wp-to-html'), $last_run['regenerated']); ?>)
        </p>
        <?php endif;
    }
    
    /**
     * Render performance section description
     */
    public function render_performance_section() {
        echo '<p>' . __('Configure performance optimizations for static HTML files.', 'wp-to-html') . '</p>';
    }
    
    /**
     * Render bundle CSS field
     */
    public function render_bundle_css_field() {
        $settings = WP_To_HTML::get_settings();
        ?>
        <label>
            <input type="checkbox" name="wp_to_html_settings[bundle_css]" value="1" 
                   <?php checked(!empty($settings['bundle_css']), true); ?>>
            <?php _e('Combine all CSS files into a single bundled file', 'wp-to-html'); ?>
        </label>
        <p class="description">
            <?php _e('When enabled, all CSS stylesheets will be downloaded and combined into a single file for faster page loading.', 'wp-to-html'); ?>
        </p>
        <?php
    }
    
    /**
     * Render bundle JS field
     */
    public function render_bundle_js_field() {
        $settings = WP_To_HTML::get_settings();
        ?>
        <label>
            <input type="checkbox" name="wp_to_html_settings[bundle_js]" value="1" 
                   <?php checked(!empty($settings['bundle_js']), true); ?>>
            <?php _e('Combine all JavaScript files into a single bundled file', 'wp-to-html'); ?>
        </label>
        <p class="description">
            <?php _e('When enabled, all JavaScript files will be downloaded and combined into a single file for faster page loading.', 'wp-to-html'); ?>
        </p>
        <?php
    }
    
    /**
     * Render cache section
     */
    public function render_cache_section() {
        $generator = WP_To_HTML_Generator::get_instance();
        $stats = $generator->get_cache_stats();
        
        ?>
        <table class="wp-to-html-stats">
            <tr>
                <th><?php _e('Cache Directory:', 'wp-to-html'); ?></th>
                <td><code><?php echo esc_html(WP_TO_HTML_CACHE_DIR); ?></code></td>
            </tr>
            <tr>
                <th><?php _e('Cached Files:', 'wp-to-html'); ?></th>
                <td><?php echo esc_html($stats['total_files']); ?></td>
            </tr>
            <tr>
                <th><?php _e('Total Size:', 'wp-to-html'); ?></th>
                <td><?php echo esc_html(size_format($stats['total_size'])); ?></td>
            </tr>
            <?php if ($stats['oldest_file']): ?>
            <tr>
                <th><?php _e('Oldest Cache:', 'wp-to-html'); ?></th>
                <td><?php echo esc_html(date_i18n(get_option('date_format') . ' ' . get_option('time_format'), $stats['oldest_file'])); ?></td>
            </tr>
            <?php endif; ?>
            <?php if ($stats['newest_file']): ?>
            <tr>
                <th><?php _e('Newest Cache:', 'wp-to-html'); ?></th>
                <td><?php echo esc_html(date_i18n(get_option('date_format') . ' ' . get_option('time_format'), $stats['newest_file'])); ?></td>
            </tr>
            <?php endif; ?>
        </table>
        <?php
    }
    
    /**
     * Add meta box to post/page editor
     */
    public function add_meta_box() {
        $post_types = get_post_types(array('public' => true), 'names');
        $excluded = array('attachment', 'product', 'product_variation');
        $post_types = array_diff($post_types, $excluded);
        
        foreach ($post_types as $post_type) {
            add_meta_box(
                'wp_to_html_exclude',
                __('WP to HTML', 'wp-to-html'),
                array($this, 'render_meta_box'),
                $post_type,
                'side',
                'default'
            );
        }
    }
    
    /**
     * Render meta box content
     */
    public function render_meta_box($post) {
        wp_nonce_field('wp_to_html_meta_box', 'wp_to_html_meta_box_nonce');
        
        $exclude = get_post_meta($post->ID, '_wp_to_html_exclude', true);
        $generator = WP_To_HTML_Generator::get_instance();
        $has_cache = $generator->has_cache($post->ID);
        $exclusion_reason = $generator->should_exclude($post);
        
        ?>
        <div class="wp-to-html-meta-box">
            <p>
                <label>
                    <input type="checkbox" name="wp_to_html_exclude" value="1" 
                           <?php checked($exclude, '1'); ?>>
                    <?php _e('Keep as dynamic PHP', 'wp-to-html'); ?>
                </label>
            </p>
            <p class="description">
                <?php _e('Check this to prevent this page from being converted to static HTML.', 'wp-to-html'); ?>
            </p>
            
            <hr>
            
            <p class="wp-to-html-status">
                <strong><?php _e('Status:', 'wp-to-html'); ?></strong><br>
                <?php if ($exclusion_reason && $exclude !== '1'): ?>
                    <span class="dashicons dashicons-warning" style="color: #dba617;"></span>
                    <?php echo esc_html($exclusion_reason); ?>
                <?php elseif ($exclude === '1'): ?>
                    <span class="dashicons dashicons-lock" style="color: #72777c;"></span>
                    <?php _e('Manually excluded', 'wp-to-html'); ?>
                <?php elseif ($has_cache): ?>
                    <span class="dashicons dashicons-yes-alt" style="color: #00a32a;"></span>
                    <?php _e('Cached as static HTML', 'wp-to-html'); ?>
                <?php else: ?>
                    <span class="dashicons dashicons-clock" style="color: #72777c;"></span>
                    <?php _e('Not yet cached', 'wp-to-html'); ?>
                <?php endif; ?>
            </p>
        </div>
        <?php
    }
    
    /**
     * Save meta box data
     */
    public function save_meta_box($post_id, $post) {
        // Verify nonce
        if (!isset($_POST['wp_to_html_meta_box_nonce']) || 
            !wp_verify_nonce($_POST['wp_to_html_meta_box_nonce'], 'wp_to_html_meta_box')) {
            return;
        }
        
        // Check permissions
        if (!current_user_can('edit_post', $post_id)) {
            return;
        }
        
        // Don't save for autosaves
        if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
            return;
        }
        
        // Save the exclusion setting
        $exclude = isset($_POST['wp_to_html_exclude']) ? '1' : '';
        update_post_meta($post_id, '_wp_to_html_exclude', $exclude);
    }
    
    /**
     * Get Nginx configuration rules
     */
    private function get_nginx_rules() {
        $cache_path = str_replace(ABSPATH, '/', WP_TO_HTML_CACHE_DIR);
        
        return "# WP-to-HTML Static Serving
location / {
    # Skip for logged-in users
    if (\$http_cookie ~* \"wordpress_logged_in\") {
        set \$skip_cache 1;
    }
    
    # Skip for POST requests
    if (\$request_method = POST) {
        set \$skip_cache 1;
    }
    
    # Try to serve cached file
    set \$cache_file \$document_root{$cache_path}\$uri/index.html;
    if (-f \$cache_file) {
        rewrite ^(.*)\$ {$cache_path}\$uri/index.html break;
    }
}";
    }
    
    /**
     * AJAX handler to get regeneration status
     */
    public function ajax_get_status() {
        check_ajax_referer('wp_to_html_status', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(__('Permission denied', 'wp-to-html'));
        }
        
        $status = WP_To_HTML_Cron::get_regeneration_status();
        
        if (!$status) {
            wp_send_json_success(array(
                'status' => 'idle',
            ));
        }
        
        wp_send_json_success($status);
    }
}