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<?php

namespace VSP\Modules;

defined( 'ABSPATH' ) || exit;

use VSP\Base;

/**
 * Class VSP_System_Logs
 *
 * @author Varun Sridharan <varunsridharan23@gmail.com>
 */
class System_Logs extends Base {
    /**
     * @var bool
     */
    protected $current = false;

    /**
     * @var null
     */
    protected $custom_path = null;

    /**
     * Reads System Log.
     *
     * @param      $filepath
     * @param int  $lines
     * @param bool $adaptive
     *
     * @return bool|string
     */
    public function read_file( $filepath, $lines = 200, $adaptive = true ) {
        $f = @fopen( $filepath, 'rb' );
        if ( false === $f ) {
            return false;
        }

        if ( ! $adaptive ) {
            $buffer = 4096;
        } else {
            $buffer = ( $lines < 2 ? 64 : ( $lines < 10 ? 512 : 4096 ) );
        }

        fseek( $f, -1, SEEK_END );

        if ( fread( $f, 1 ) !== "\n" ) {
            $lines -= 1;
        }

        $output = '';
        while ( ftell( $f ) > 0 && $lines >= 0 ) {
            $seek = min( ftell( $f ), $buffer );
            fseek( $f, -$seek, SEEK_CUR );
            $chunk  = fread( $f, $seek );
            $output = $chunk . $output;
            fseek( $f, -mb_strlen( $chunk, '8bit' ), SEEK_CUR );
            $lines -= substr_count( $chunk, "\n" );
        }

        while ( $lines++ < 0 ) {
            $output = substr( $output, strpos( $output, "\n" ) + 1 );
        }
        fclose( $f );
        return trim( $output );
    }

    /**
     * Outputs HTML.
     *
     * @param bool $custom_path
     */
    public function render( $custom_path = false ) {
        $this->current     = ( isset( $_REQUEST['vsp-log-file'] ) ) ? $_REQUEST['vsp-log-file'] : false;
        $this->custom_path = $custom_path;

        if ( isset( $_REQUEST['delete-handle'] ) && ! empty( $_REQUEST['delete-handle'] ) ) {
            $this->remove_log();
        }

        include( VSP_PATH . 'views/log-viewer.php' );
    }

    /**
     * Deletes A File.
     */
    public function remove_log() {
        if ( isset( $_REQUEST['delete-handle'] ) && isset( $_REQUEST['_wpnonce'] ) ) {
            if ( ! wp_verify_nonce( wp_unslash( $_REQUEST['_wpnonce'] ), 'remove_log' ) ) { // WPCS: input var ok, sanitization ok.
                wp_die( esc_html__( 'Action failed. Please refresh the page and retry.', 'vsp-framework' ) );
            }

            $file     = $_REQUEST['delete-handle'];
            $ff_regx  = '/\.([^.]+)$/';
            $ff_types = array( 'log', 'txt' );
            if ( preg_match( $ff_regx, $file, $m ) && in_array( $m[1], $ff_types, true ) ) {
                $files = vsp_list_log_files();
                foreach ( $files as $f ) {
                    if ( preg_match( $ff_regx, $f, $m2 ) && in_array( $m2[1], $ff_types, true ) ) {
                        if ( $f === $file && file_exists( VSP_LOG_DIR . $f ) ) {
                            unlink( VSP_LOG_DIR . $f );
                        }
                    }
                }
            }
            wp_safe_redirect( esc_url_raw( remove_query_arg( array( 'delete-handle', '_wpnonce' ) ) ) );
            exit();
        } else {
            wp_die( esc_html__( 'Invalid wpnonce or log file not found!.', 'vsp-framework' ) );
        }
    }
}