<?php
/**
 * Upload REST API Controller for the plugin.
 *
 * This class handles REST API endpoints for file upload operations.
 *
 * @package    QDR_Temporary_Shared_Storage
 * @since      1.0.0
 */
class QDR_TSS_Upload_Controller {

    /**
     * The plugin name.
     *
     * @since    1.0.0
     * @access   private
     * @var      string    $plugin_name    The name of this plugin.
     */
    private $plugin_name;

    /**
     * The plugin version.
     *
     * @since    1.0.0
     * @access   private
     * @var      string    $version    The version of this plugin.
     */
    private $version;

    /**
     * The namespace for the REST API routes.
     *
     * @since    1.0.0
     * @access   private
     * @var      string    $namespace    The namespace for the REST API routes.
     */
    private $namespace = 'qdr-tss/v1';

    /**
     * The database manager instance.
     *
     * @since    1.0.0
     * @access   private
     * @var      QDR_TSS_DB_Manager    $db_manager    The database manager instance.
     */
    private $db_manager;

    /**
     * The file manager instance.
     *
     * @since    1.0.0
     * @access   private
     * @var      QDR_TSS_File_Manager    $file_manager    The file manager instance.
     */
    private $file_manager;

    /**
     * The settings instance.
     *
     * @since    1.0.0
     * @access   private
     * @var      QDR_TSS_Settings    $settings    The settings instance.
     */
    private $settings;

    /**
     * Initialize the class and set its properties.
     *
     * @since    1.0.0
     * @param    string    $plugin_name    The name of this plugin.
     * @param    string    $version        The version of this plugin.
     */
    public function __construct($plugin_name, $version) {
        $this->plugin_name = $plugin_name;
        $this->version = $version;
        $this->db_manager = QDR_TSS_DB_Manager::instance();
        $this->file_manager = QDR_TSS_File_Manager::instance();
        $this->settings = QDR_TSS_Settings::instance();
    }

    /**
     * Register the REST API routes.
     *
     * @since    1.0.0
     */
    public function register_routes() {
        // Chunked upload endpoints
        register_rest_route($this->namespace, '/upload/init', array(
            'methods' => WP_REST_Server::CREATABLE,
            'callback' => array($this, 'init_chunked_upload'),
            'permission_callback' => array($this, 'check_permission'),
        ));
        
        register_rest_route($this->namespace, '/upload/chunk', array(
            'methods' => WP_REST_Server::CREATABLE,
            'callback' => array($this, 'upload_chunk'),
            'permission_callback' => array($this, 'check_permission'),
        ));
        
        register_rest_route($this->namespace, '/upload/finalize', array(
            'methods' => WP_REST_Server::CREATABLE,
            'callback' => array($this, 'finalize_chunked_upload'),
            'permission_callback' => array($this, 'check_permission'),
        ));
    }

    /**
     * Check permission for REST API requests.
     *
     * @since    1.0.0
     * @return   bool    True if authorized, false otherwise.
     */
    public function check_permission() {
        $rest_controller = new QDR_TSS_REST_Controller($this->plugin_name, $this->version);
        return $rest_controller->check_rest_permission();
    }

    /**
     * Initialize chunked upload.
     *
     * @since    1.0.0
     * @param    WP_REST_Request    $request    Full details about the request.
     * @return   WP_REST_Response|WP_Error      Response object on success, or WP_Error object on failure.
     */
    public function init_chunked_upload($request) {
        // Check required parameters
        if (!isset($request['original_file_name']) || !isset($request['file_size'])) {
            return new WP_Error(
                'qdr_tss_missing_params',
                __('Missing required parameters.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        $file_size = (int) $request['file_size'];
        $max_upload_size = $this->settings->get_setting('max_upload_size');
        
        // Check max upload size
        if ($file_size > $max_upload_size) {
            return new WP_Error(
                'qdr_tss_file_too_large',
                __('File exceeds maximum upload size.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        // Check total storage usage
        if ($this->db_manager->would_exceed_storage_limit($file_size, $max_upload_size)) {
            return new WP_Error(
                'qdr_tss_storage_limit',
                __('Storage limit exceeded.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        // Initialize chunked upload
        $upload_id = $this->file_manager->init_chunked_upload();
        
        if (!$upload_id) {
            return new WP_Error(
                'qdr_tss_init_failed',
                __('Failed to initialize upload.', 'qdr-temporary-shared-storage'),
                array('status' => 500)
            );
        }
        
        return new WP_REST_Response(array(
            'upload_id' => $upload_id,
            'status' => 'initialized'
        ), 200);
    }

    /**
     * Upload a chunk.
     *
     * @since    1.0.0
     * @param    WP_REST_Request    $request    Full details about the request.
     * @return   WP_REST_Response|WP_Error      Response object on success, or WP_Error object on failure.
     */
    public function upload_chunk($request) {
        // Check required parameters
        if (!isset($request['upload_id']) || !isset($request['chunk_index']) || !isset($request['total_chunks'])) {
            return new WP_Error(
                'qdr_tss_missing_params',
                __('Missing required parameters.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        $upload_id = $request['upload_id'];
        $chunk_index = (int) $request['chunk_index'];
        $total_chunks = (int) $request['total_chunks'];
        
        // Handle file upload
        $files = $request->get_file_params();
        
        if (empty($files) || !isset($files['chunk'])) {
            return new WP_Error(
                'qdr_tss_no_file',
                __('No file uploaded.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        $chunk_file = $files['chunk'];
        
        // Store chunk
        $result = $this->file_manager->store_chunk($upload_id, $chunk_index, $chunk_file);
        
        if (!$result) {
            return new WP_Error(
                'qdr_tss_chunk_failed',
                __('Failed to upload chunk.', 'qdr-temporary-shared-storage'),
                array('status' => 500)
            );
        }
        
        return new WP_REST_Response(array(
            'upload_id' => $upload_id,
            'chunk_index' => $chunk_index,
            'status' => 'chunk_uploaded'
        ), 200);
    }

    /**
     * Finalize chunked upload.
     *
     * @since    1.0.0
     * @param    WP_REST_Request    $request    Full details about the request.
     * @return   WP_REST_Response|WP_Error      Response object on success, or WP_Error object on failure.
     */
    public function finalize_chunked_upload($request) {
        // Check required parameters
        if (!isset($request['upload_id']) || !isset($request['total_chunks'])) {
            return new WP_Error(
                'qdr_tss_missing_params',
                __('Missing required parameters.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        $upload_id = $request['upload_id'];
        $total_chunks = (int) $request['total_chunks'];
        
        // Check for required file metadata
        $required_fields = array('original_file_name', 'description', 'password');
        foreach ($required_fields as $field) {
            if (!isset($request[$field]) || empty($request[$field])) {
                return new WP_Error(
                    'qdr_tss_missing_field',
                    sprintf(__('Missing required field: %s', 'qdr-temporary-shared-storage'), $field),
                    array('status' => 400)
                );
            }
        }
        
        // Check that all chunks are present
        if (!$this->file_manager->check_all_chunks($upload_id, $total_chunks)) {
            return new WP_Error(
                'qdr_tss_missing_chunks',
                __('Not all chunks have been uploaded.', 'qdr-temporary-shared-storage'),
                array('status' => 400)
            );
        }
        
        // Finalize upload
        $result = $this->file_manager->finalize_chunked_upload(
            $upload_id,
            $total_chunks,
            $request['original_file_name']
        );
        
        if (!$result) {
            return new WP_Error(
                'qdr_tss_finalize_failed',
                __('Failed to finalize upload.', 'qdr-temporary-shared-storage'),
                array('status' => 500)
            );
        }
        
        $file_path = $result['file_path'];
        $file_size = $result['file_size'];
        
        // Set dates
        $active_from = !empty($request['active_from']) ? $request['active_from'] : current_time('mysql');
        $active_to = !empty($request['active_to']) ? $request['active_to'] : date('Y-m-d H:i:s', strtotime('+30 days'));
        
        // Generate a unique media ID
        $media_id = time() . rand(1000, 9999);
        
        // Insert into database
        $data = array(
            'media_id' => $media_id,
            'original_file_name' => sanitize_file_name($request['original_file_name']),
            'description' => sanitize_textarea_field($request['description']),
            'message' => isset($request['message']) ? sanitize_textarea_field($request['message']) : '',
            'active_from' => $active_from,
            'active_to' => $active_to,
            'password' => wp_hash_password($request['password']),
            'reference' => isset($request['reference']) ? sanitize_text_field($request['reference']) : '',
            'upload_date' => current_time('mysql'),
            'file_path' => $file_path,
            'file_size' => $file_size
        );
        
        $item_id = $this->db_manager->insert_item($data);
        
        if (!$item_id) {
            // Delete file if database insert fails
            $this->file_manager->delete_file($file_path);
            
            return new WP_Error(
                'qdr_tss_db_failed',
                __('Failed to save file information.', 'qdr-temporary-shared-storage'),
                array('status' => 500)
            );
        }
        
        $download_url = site_url('shared-file-download/' . $media_id);
        $shortcode = '[qdr_tss_download id="' . $media_id . '"]';
        
        return new WP_REST_Response(array(
            'media_id' => $media_id,
            'permalink' => $download_url,
            'shortcode' => $shortcode
        ), 201);
    }
}