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<?php
/**
 * WP Google Maps Pro Import / Export API: Import abstract class
 *
 * @package WPGMapsPro\ImportExport
 * @since 7.0.0
 */

namespace WPGMZA;

/**
 * Importer for WP Google Maps Pro
 *
 * This handles importing of files.
 *
 * @since 7.0.0
 */
abstract class Import {

    /**
     * Absolute path to file.
     *
     * @var string $file Absolute path to file.
     */
    protected $file = '';

    /**
     * URL to file.
     *
     * @var string $file URL to file.
     */
    protected $file_url = '';

    /**
     * Decoded file data.
     *
     * @var mixed $file_data Decoded file data.
     */
    protected $file_data = null;

    /**
     * Import options.
     *
     * @var array $options Import options.
     */
    protected $options = array();

    /**
     * Database insertion defaults.
     *
     * @var array $db_defaults Array of object types with key value pairs of default data.
     */
    protected $db_defaults = array();
    
    private $recorded_start_time;
    
    /**
     * Import constructor.
     *
     * @throws \Exception If unable to load file.
     *
     * @param string $file     Optional. Absolute path to file.
     * @param string $file_url Optional. URL to file.
     * @param array  $options  Optional. Import options.
     */
    public function __construct( $file = '', $file_url = '', $options = array() ) {

        $this->options = $options;
        if ( file_exists( $file ) ) {

            $this->file = $file;

        }

        if ( strpos( $file_url, 'http' ) === 0 ) {

            $this->file_url = $file_url;

        }

        $this->load_file();
        $this->parse_file();
        
        if ( empty( $this->file_data ) ) {

            throw new \Exception( __( 'Error: Unable to load file.', 'wp-google-maps' ) );

        }

        $this->options = $options;
        $this->check_options();
        
        $this->record_start_time();
        $this->attempt_set_time_limit();
    }

    /**
     * Sanitize options.
     */
    abstract protected function check_options();

    /**
     * Check ids.
     *
     * @throws \Exception On bad id.
     *
     * @param array $ids Integer array of ids.
     * @return array Integer array of ids.
     */
    protected function check_ids( $ids ) {

        $id_count = count( $ids );

        for ( $i = 0; $i < $id_count; $i++ ) {

            if ( ! is_numeric( $ids[ $i ] ) ) {

                throw new \Exception( __( 'Error: Malformed options. Bad id.', 'wp-google-maps' ) );

            }

            $ids[ $i ] = absint( $ids[ $i ] );

            if ( $ids[ $i ] < 1 ) {

                throw new \Exception( __( 'Error: Malformed options. Bad id.', 'wp-google-maps' ) );

            }
        }

        return $ids;

    }

    /**
     * Load file data from file.
     */
    protected function load_file() {

        if ( ! empty( $this->file ) ) {

            $file_contents = file_get_contents( $this->file );

            if ( ! empty( $file_contents ) ) {

                $this->file_data = $file_contents;

            }
            
        }

        if ( empty( $file_contents ) && ! empty( $this->file_url ) ) {

            $file_contents = wp_remote_get( $this->file_url );
            
            if ( ! is_wp_error( $file_contents ) ) {

                $this->file_data = wp_remote_retrieve_body( $file_contents );

            }
        }
    }
    
    protected function attempt_set_time_limit()
    {
        $desired_time_limit = 60 * 15;
        
        if(function_exists('set_time_limit'))
            set_time_limit($desired_time_limit);
        
        if(function_exists('get_time_limit'))
            ini_set('max_execution_time', $desired_time_limit);
    }
    
    protected function record_start_time()
    {
        $this->recorded_start_time = time();
    }
    
    protected function get_time_limit()
    {
        if(function_exists('ini_get'))
            return (int)ini_get('max_execution_time');
        
        return 30; // PHP default
    }
    
    protected function get_remaining_time()
    {
        $now = time();
        $elapsed = (int)$now - (int)$this->recorded_start_time;
        $limit = $this->get_time_limit();
        
        return $limit - $elapsed;
    }
    
    protected function bail_if_near_time_limit()
    {
        $remaining = $this->get_remaining_time();
        $threshold = 5;
        
        if($remaining < $threshold)
            throw new \Exception(__('Time limit threshold reached. Please speak to your host to increase your PHP execution time limit, or break your data into smaller parts', 'wp-google-maps'));
    }

    /**
     * Parse file data.
     */
    abstract protected function parse_file();

    /**
     * Output admin import options.
     *
     * @return string Options html.
     */
    abstract public function admin_options();

    /**
     * Import the file.
     */
    abstract public function import();
    
    public function onImportComplete()
    {
        global $wpdb;
        global $wpgmza_tblname_maps;
        
        // TODO: Use global settings module
        $settings = get_option('WPGMZA_OTHER_SETTINGS');
        
        if(!empty($settings['wpgmza_settings_marker_pull']) && $settings['wpgmza_settings_marker_pull'] == '1') // TODO: Replace with constant
        {
            $map_ids = $wpdb->get_col("SELECT id FROM $wpgmza_tblname_maps");
            
            foreach($map_ids as $map_id)
                wpgmaps_update_xml_file($map_id);
        }
        
        do_action('wpgmza_import_complete');
    }

    /**
     * Sets the import progress for this session.
     *
     * @param float $value A number between 0 and 1 representing the progress.
     */
    public function set_progress( $value ) {

        @session_start();

        $_SESSION['wpgmza_import_progress_' . $_POST['wpgmaps_security']] = $value;

        session_write_close();

    }

    /**
     * Returns HTML for the admin notices.
     *
     * @return string
     */
    public function get_admin_notices() {

        return '';

    }

    /**
     * Geocode.
     *
     * @param string $location Either an address or latitude, longitude coordinates.
     * @param string $type     Optional. 'address' to geocode, 'latlng' to reverse geocode. Default 'address'.
     * @return string|array|bool Address or array of latitude and longitude, false on failure or no results.
     */
    protected function geocode( $location, $type = 'address' ) {

        $api_key = get_option( 'wpgmza_google_maps_api_key' );

        if ( empty( $api_key ) || empty( $location ) || ( 'address' !== $type && 'latlng' !== $type ) ) {

            return false;

        }

        $url = add_query_arg( array(
            $type => rawurlencode( $location ),
            'key' => $api_key,
        ), 'https://maps.googleapis.com/maps/api/geocode/json' );

        $start_time = microtime( true );

        $response = wp_remote_get( $url );

        if ( is_wp_error( $response ) ) {

            return false;

        }

        $response = wp_remote_retrieve_body( $response );
        $response = json_decode( $response );

        $this->geocode_response = $response;

        $result = false;

        switch ( $type ) {

            case 'address':

                if ( isset( $response->results[0]->geometry->location->lat, $response->results[0]->geometry->location->lng ) ) {

                    $result = array( $response->results[0]->geometry->location->lat, $response->results[0]->geometry->location->lng );

                }
                break;

            case 'latlng':

                if ( isset( $response->results[0]->formatted_address ) ) {

                    $result = $response->results[0]->formatted_address;

                }
                break;

        }

        $end_time = microtime( true );
        $delta_time = $end_time - $start_time;
        $min_time_between_requests = 1000000 / 10;

        if ( $delta_time < $min_time_between_requests ) {

            $delay = $min_time_between_requests - $delta_time;
            usleep( $delay );

        }

        return $result;

    }
}