<?php
/**
 * HVAC Announcements Admin Interface
 *
 * @package HVAC_Community_Events
 * @since 1.0.0
 */

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

/**
 * Class HVAC_Announcements_Admin
 *
 * Handles admin interface for creating and managing announcements
 */
class HVAC_Announcements_Admin {
    
    /**
     * Instance of this class
     *
     * @var HVAC_Announcements_Admin
     */
    private static $instance = null;
    
    /**
     * Get instance of this class
     *
     * @return HVAC_Announcements_Admin
     */
    public static function get_instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    /**
     * Constructor
     */
    private function __construct() {
        $this->init_hooks();
    }
    
    /**
     * Initialize hooks
     */
    private function init_hooks() {
        add_action('wp_enqueue_scripts', array($this, 'enqueue_admin_assets'));
    }
    
    /**
     * Enqueue admin assets on master trainer pages
     */
    public function enqueue_admin_assets() {
        // Only enqueue on master trainer announcement pages
        if ($this->is_master_trainer_announcement_page()) {
            // Ensure jQuery and editor dependencies are loaded in head
            // CRITICAL: Load in head (false) because wp_editor() outputs inline scripts in body
            wp_enqueue_script('jquery');
            wp_enqueue_script('editor');
            wp_enqueue_editor();

            // Enqueue admin JavaScript - MUST load in head to be available for wp_editor inline scripts
            wp_enqueue_script(
                'hvac-announcements-admin',
                plugin_dir_url(dirname(__FILE__)) . 'assets/js/hvac-announcements-admin.js',
                array('jquery', 'editor'),
                defined('HVAC_VERSION') ? HVAC_VERSION : '1.0.0',
                false  // Load in head, not footer, for wp_editor compatibility
            );
            
            // Localize script with AJAX data
            wp_localize_script('hvac-announcements-admin', 'hvac_announcements', array(
                'ajax_url' => admin_url('admin-ajax.php'),
                'nonce' => wp_create_nonce('hvac_announcements_admin_nonce'),
                'strings' => array(
                    'confirm_delete' => __('Are you sure you want to delete this announcement?', 'hvac'),
                    'error_loading' => __('Error loading announcements.', 'hvac'),
                    'error_saving' => __('Error saving announcement.', 'hvac'),
                    'success_deleted' => __('Announcement deleted successfully.', 'hvac'),
                )
            ));
            
            // Enqueue WordPress media uploader
            wp_enqueue_media();
            
            // Enqueue admin CSS
            wp_enqueue_style(
                'hvac-announcements-admin',
                plugin_dir_url(dirname(__FILE__)) . 'assets/css/hvac-announcements-admin.css',
                array(),
                defined('HVAC_VERSION') ? HVAC_VERSION : '1.0.0'
            );
        }
    }
    
    /**
     * Check if current page is master trainer announcement page
     *
     * @return bool
     */
    private function is_master_trainer_announcement_page() {
        global $post;
        
        if (!is_a($post, 'WP_Post')) {
            return false;
        }
        
        // Check if user is master trainer
        if (!HVAC_Announcements_Permissions::is_master_trainer()) {
            return false;
        }
        
        // Check for announcement pages
        $announcement_slugs = array(
            'announcements',              // Primary announcement page
            'master-announcements',
            'master-manage-announcements',
            'manage-announcements'
        );
        
        return in_array($post->post_name, $announcement_slugs);
    }
    
    /**
     * Render admin interface modal HTML
     *
     * @return string Modal HTML
     */
    public function render_admin_interface() {
        // Check permissions
        if (!HVAC_Announcements_Permissions::is_master_trainer()) {
            return '';
        }
        
        ob_start();
        ?>
        
        <!-- Announcements Management Interface -->
        <div class="hvac-announcements-wrapper">
            
            <!-- Controls Section -->
            <div class="announcements-controls">
                <div class="search-controls">
                    <input type="search" id="announcement-search" placeholder="<?php _e('Search announcements...', 'hvac'); ?>" class="regular-text">
                    <button id="search-btn" class="button"><?php _e('Search', 'hvac'); ?></button>
                </div>
                
                <div class="filter-controls">
                    <select id="status-filter">
                        <option value="any"><?php _e('All Statuses', 'hvac'); ?></option>
                        <option value="publish"><?php _e('Published', 'hvac'); ?></option>
                        <option value="draft"><?php _e('Draft', 'hvac'); ?></option>
                        <option value="pending"><?php _e('Pending', 'hvac'); ?></option>
                    </select>
                </div>
            </div>
            
            <!-- Announcements Table -->
            <div class="announcements-table-wrapper">
                <table class="wp-list-table widefat fixed striped announcements">
                    <thead>
                        <tr>
                            <th scope="col" class="manage-column column-title"><?php _e('Title', 'hvac'); ?></th>
                            <th scope="col" class="manage-column column-status"><?php _e('Status', 'hvac'); ?></th>
                            <th scope="col" class="manage-column column-categories"><?php _e('Categories', 'hvac'); ?></th>
                            <th scope="col" class="manage-column column-author"><?php _e('Author', 'hvac'); ?></th>
                            <th scope="col" class="manage-column column-date"><?php _e('Date', 'hvac'); ?></th>
                            <th scope="col" class="manage-column column-actions"><?php _e('Actions', 'hvac'); ?></th>
                        </tr>
                    </thead>
                    <tbody id="announcements-list">
                        <!-- Content loaded via AJAX -->
                    </tbody>
                </table>
            </div>
            
            <!-- Pagination -->
            <div class="tablenav bottom">
                <div class="tablenav-pages">
                    <span class="displaying-num">
                        <span id="current-page">1</span> of <span id="total-pages">1</span>
                    </span>
                    <span class="pagination-links">
                        <button id="prev-page" class="button"><?php _e('Previous', 'hvac'); ?></button>
                        <button id="next-page" class="button"><?php _e('Next', 'hvac'); ?></button>
                    </span>
                </div>
            </div>
        </div>
        
        <!-- Announcement Modal -->
        <div id="announcement-modal" class="hvac-modal">
            <div class="modal-content">
                <div class="modal-header">
                    <h2 id="modal-title"><?php _e('Add New Announcement', 'hvac'); ?></h2>
                    <span class="modal-close">&times;</span>
                </div>
                
                <div class="modal-body">
                    <form id="announcement-form">
                        <?php wp_nonce_field('hvac_announcement_form', 'announcement_nonce'); ?>
                        <input type="hidden" id="announcement-id" name="announcement_id" value="">
                        
                        <!-- Title Field -->
                        <div class="form-field">
                            <label for="announcement-title"><?php _e('Title', 'hvac'); ?> <span class="required">*</span></label>
                            <input type="text" id="announcement-title" name="announcement_title" class="widefat" required>
                        </div>
                        
                        <!-- Content Field -->
                        <div class="form-field">
                            <label for="announcement-content"><?php _e('Content', 'hvac'); ?> <span class="required">*</span></label>
                            <?php
                            wp_editor('', 'announcement-content', array(
                                'textarea_name' => 'announcement_content',
                                'media_buttons' => true,
                                'textarea_rows' => 10,
                                'teeny' => false,
                                'dfw' => false,
                                'tinymce' => array(
                                    'resize' => false,
                                    'wordpress_adv_hidden' => false,
                                    'add_unload_trigger' => false,
                                    'statusbar' => false,
                                    'wp_autoresize_on' => false,
                                    'height' => 300
                                ),
                                'quicktags' => true
                            ));
                            ?>
                        </div>
                        
                        <!-- Excerpt Field -->
                        <div class="form-field">
                            <label for="announcement-excerpt"><?php _e('Excerpt', 'hvac'); ?></label>
                            <textarea id="announcement-excerpt" name="announcement_excerpt" rows="3" class="widefat"></textarea>
                            <p class="description"><?php _e('Brief summary for timeline view (optional).', 'hvac'); ?></p>
                        </div>
                        
                        <!-- Status Field -->
                        <div class="form-field">
                            <label for="announcement-status"><?php _e('Status', 'hvac'); ?></label>
                            <select id="announcement-status" name="announcement_status" class="widefat">
                                <option value="draft"><?php _e('Draft', 'hvac'); ?></option>
                                <option value="publish"><?php _e('Published', 'hvac'); ?></option>
                                <option value="pending"><?php _e('Pending Review', 'hvac'); ?></option>
                            </select>
                        </div>
                        
                        <!-- Publish Date Field -->
                        <div class="form-field">
                            <label for="announcement-date"><?php _e('Publish Date', 'hvac'); ?></label>
                            <input type="datetime-local" id="announcement-date" name="announcement_date" class="widefat">
                            <p class="description"><?php _e('Leave empty to publish immediately.', 'hvac'); ?></p>
                        </div>
                        
                        <!-- Categories Field -->
                        <div class="form-field">
                            <label><?php _e('Categories', 'hvac'); ?></label>
                            <div id="categories-container" class="checkbox-container">
                                <!-- Categories loaded via AJAX -->
                            </div>
                        </div>
                        
                        <!-- Tags Field -->
                        <div class="form-field">
                            <label for="announcement-tags"><?php _e('Tags', 'hvac'); ?></label>
                            <input type="text" id="announcement-tags" name="announcement_tags" class="widefat">
                            <p class="description"><?php _e('Comma-separated tags.', 'hvac'); ?></p>
                        </div>
                        
                        <!-- Featured Image Field -->
                        <div class="form-field">
                            <label><?php _e('Featured Image', 'hvac'); ?></label>
                            <div class="featured-image-section">
                                <input type="hidden" id="featured-image-id" name="featured_image_id" value="">
                                <div id="featured-image-preview"></div>
                                <div class="featured-image-buttons">
                                    <button type="button" id="select-featured-image" class="button"><?php _e('Select Image', 'hvac'); ?></button>
                                    <button type="button" id="remove-featured-image" class="button" style="display: none;"><?php _e('Remove Image', 'hvac'); ?></button>
                                </div>
                            </div>
                        </div>
                        
                        <!-- Form Actions -->
                        <div class="form-actions">
                            <button type="submit" class="button button-primary"><?php _e('Save Announcement', 'hvac'); ?></button>
                            <button type="button" class="button modal-cancel"><?php _e('Cancel', 'hvac'); ?></button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
        
        <?php
        return ob_get_clean();
    }
}