<?php

if ( !defined( 'ABSPATH' ) ) {
    die;
}
/*
 * Declaring Class
 */
class AEH_Main
{
    public  $settings ;
    public  $external_settings ;
    public function __construct()
    {
        $this->settings = AEH_Settings::get_instance();
        $this->external_settings = get_option( 'aeh_expires_headers_external_cache_settings' );
    }
    
    public function activate_plugin_settings()
    {
        
        if ( $this->external_settings ) {
            $this->external_settings['enable_cache'] = true;
            update_option( 'aeh_expires_headers_external_cache_settings', $this->external_settings );
        }
    
    }
    
    public function remove_settings()
    {
        $this->delete_from_htaccess();
        if ( get_option( 'aeh_scanned_urls' ) ) {
            delete_option( 'aeh_scanned_urls' );
        }
        if ( get_option( 'aeh_extracted_urls' ) ) {
            delete_option( 'aeh_extracted_urls' );
        }
        if ( get_option( 'aeh_expires_headers_external_cache_settings' ) ) {
            delete_option( 'aeh_expires_headers_external_cache_settings' );
        }
        if ( get_option( 'aeh_expires_headers_advance_settings' ) ) {
            delete_option( 'aeh_expires_headers_advance_settings' );
        }
        if ( get_option( 'aeh_expires_headers_settings' ) ) {
            delete_option( 'aeh_expires_headers_settings' );
        }
        // Folder path to be flushed
        $files = glob( AEH_DIR . 'cached-scripts/*' );
        if ( $files ) {
            foreach ( $files as $file ) {
                if ( is_file( $file ) ) {
                    unlink( $file );
                }
            }
        }
    }
    
    /*checking for mod_expires module on server */
    public function aeh_is_mod_not_loaded( $mod, $default = false )
    {
        global  $is_apache ;
        
        if ( $is_apache ) {
            
            if ( function_exists( 'apache_get_modules' ) ) {
                $mods = apache_get_modules();
                
                if ( in_array( $mod, $mods ) ) {
                    return false;
                } else {
                    return 'Add Expires Headers requires the apache mod_expires module to be enabled on the server.';
                }
            
            } elseif ( function_exists( 'phpinfo' ) && false === strpos( ini_get( 'disable_functions' ), 'phpinfo' ) ) {
                ob_start();
                phpinfo( 8 );
                $phpinfo = ob_get_clean();
                
                if ( false !== strpos( $phpinfo, $mod ) ) {
                    return false;
                } else {
                    return 'Add Expires Headers requires the apache mod_expires module to be enabled on the server.';
                }
            
            }
        
        } else {
            return false;
        }
    
    }
    
    /* main function which updates lines to .htaccess file according to plugin settings */
    public function write_to_htaccess()
    {
        /* clean up all old plugin lines in htaccess file */
        
        if ( $this->delete_from_htaccess() == -1 ) {
            return -1;
            //unable to write to the file
        }
        
        $htaccess = ABSPATH . '.htaccess';
        /*get the subdirectory if it is installed in one*/
        $siteurl = explode( '/', get_option( 'siteurl' ) );
        
        if ( isset( $siteurl[3] ) ) {
            $dir = '/' . $siteurl[3] . '/';
        } else {
            $dir = '/';
        }
        
        
        if ( !($f = @fopen( $htaccess, 'a+' )) ) {
            @chmod( $htaccess, 0644 );
            if ( !($f = @fopen( $htaccess, 'a+' )) ) {
                return -1;
            }
        }
        
        @ini_set( 'auto_detect_line_endings', true );
        $ht = explode( PHP_EOL, implode( '', file( $htaccess ) ) );
        //parse each line of file into array
        $rules = $this->getrules();
        if ( $rules == -1 ) {
            return -1;
        }
        $rulesarray = explode( PHP_EOL, $rules );
        $contents = array_merge( $rulesarray, $ht );
        
        if ( !($f = @fopen( $htaccess, 'w+' )) ) {
            return -1;
            //we can't write to the file
        }
        
        $blank = false;
        //write each line to file
        foreach ( $contents as $insertline ) {
            
            if ( trim( $insertline ) == '' ) {
                if ( $blank == false ) {
                    fwrite( $f, PHP_EOL . trim( $insertline ) );
                }
                $blank = true;
            } else {
                $blank = false;
                fwrite( $f, PHP_EOL . trim( $insertline ) );
            }
        
        }
        @fclose( $f );
        return 1;
        //success
    }
    
    /* getting lines to be added in .htaccess files base on settings */
    private function getrules()
    {
        @ini_set( 'auto_detect_line_endings', true );
        //figure out what server they're using
        
        if ( strstr( strtolower( filter_var( $_SERVER['SERVER_SOFTWARE'], FILTER_SANITIZE_STRING ) ), 'apache' ) ) {
            $aiowps_server = 'apache';
        } else {
            
            if ( strstr( strtolower( filter_var( $_SERVER['SERVER_SOFTWARE'], FILTER_SANITIZE_STRING ) ), 'nginx' ) ) {
                $aiowps_server = 'nginx';
            } else {
                
                if ( strstr( strtolower( filter_var( $_SERVER['SERVER_SOFTWARE'], FILTER_SANITIZE_STRING ) ), 'litespeed' ) ) {
                    $aiowps_server = 'litespeed';
                } else {
                    //unsupported server
                    return -1;
                }
            
            }
        
        }
        
        $rules = '';
        //$aeh_main_setting = get_option('aeh_main_setting');
        $aeh_expires_headers_settings = get_option( 'aeh_expires_headers_settings' );
        $rules .= '<IfModule mod_expires.c>' . PHP_EOL;
        $rules .= 'ExpiresActive on' . PHP_EOL;
        //Working on Image Type File formats
        $general_settings = $this->settings->expires_headers_general_settings;
        foreach ( $general_settings as $key => $value ) {
            $rules .= "#" . $key . PHP_EOL;
            
            if ( isset( $aeh_expires_headers_settings['general'][$key] ) ) {
                //&& ($aeh_expires_headers_settings[$key] == '1')){
                $type_key = 'expires_headers_' . $key . '_types';
                foreach ( $aeh_expires_headers_settings[$key] as $key1 => $value1 ) {
                    
                    if ( isset( $aeh_expires_headers_settings[$key][$key1] ) ) {
                        //&& ($aeh_expires_headers_settings[$key][$key1] == '1')){
                        $expiryDays = ( isset( $aeh_expires_headers_settings['expires_days'][$key] ) && !empty($aeh_expires_headers_settings['expires_days'][$key]) ? $aeh_expires_headers_settings['expires_days'][$key] : 30 );
                        $rules .= 'ExpiresByType ' . $key . '/' . $key1 . ' "access plus ' . $expiryDays . ' days"' . PHP_EOL;
                    }
                
                }
            }
        
        }
        $rules .= '</IfModule>' . PHP_EOL;
        //}
        //Add outer markers if we have rules
        if ( $rules != '' ) {
            $rules = "# BEGIN Add Expires Headers Plugin" . PHP_EOL . $rules . "# END Add Expires Headers Plugin" . PHP_EOL;
        }
        return $rules;
    }
    
    /* delete previous plugin lines from file */
    private function delete_from_htaccess( $section = 'Add Expires Headers Plugin' )
    {
        $htaccess = ABSPATH . '.htaccess';
        @ini_set( 'auto_detect_line_endings', true );
        
        if ( !file_exists( $htaccess ) ) {
            $ht = @fopen( $htaccess, 'a+' );
            @fclose( $ht );
        }
        
        $ht_contents = explode( PHP_EOL, implode( '', file( $htaccess ) ) );
        //parse each line of file into array
        
        if ( $ht_contents ) {
            //as long as there are lines in the file
            $state = true;
            
            if ( !($f = @fopen( $htaccess, 'w+' )) ) {
                @chmod( $htaccess, 0644 );
                if ( !($f = @fopen( $htaccess, 'w+' )) ) {
                    return -1;
                }
            }
            
            foreach ( $ht_contents as $n => $markerline ) {
                //for each line in the file
                if ( strpos( $markerline, '# BEGIN ' . $section ) !== false ) {
                    //if we're at the beginning of the section
                    $state = false;
                }
                if ( $state == true ) {
                    //as long as we're not in the section keep writing
                    fwrite( $f, trim( $markerline ) . PHP_EOL );
                }
                if ( strpos( $markerline, '# END ' . $section ) !== false ) {
                    //see if we're at the end of the section
                    $state = true;
                }
            }
            @fclose( $f );
            return 1;
        }
        
        return 1;
    }

}