<?php
// vim:set ft=php et sw=4:

//インクルード
require_once 'sys/common/data.php';
require_once 'common/config.inc';
require_once 'common/util.inc';
require_once 'common/http.inc';
require_once 'vendor/twango.inc';
require_once 'sys/common/portal_file.inc';
require_once 'common/database.inc';
require_once 'common/server_info.php';

// 標準のテンプレートファイル名
// 将来的にはエディターで設定したいものです。
$DEFAULT_TEMPLATE_FILE = 'template_v19.html';
$DEFAULT_ADDPART_ARRAY = array(2 => 'count_visitor.php');
$DEFAULT_TAGPART_ARRAY = array();

// 指定されたCP_CODEを持つ広告情報を設定ファイルから読み込む
// @param co_code string 対象のco_code(キャンペーンエディターのcpid)
// データベースは参照していないのでキャンペーンエディターで「再生成」されるまでは
// 反映されないので注意してください。
function load_cp_info($cp_code)
{
    global $DEFAULT_TEMPLATE_FILE, $DEFAULT_ADDPART_ARRAY, $DEFAULT_TAGPART_ARRAY;

    // 個人アフィリエイト対応
    if (strpos($cp_code, 'a_') === 0) {
        $cpid = 'affiliate';
    } else {
        $cpid = $cp_code;
    }

    // Yahoo Premium対応
    if (($pos = strpos($cp_code, ':')) !== false) {
        $data = explode(':', $cp_code);
        $cpid = $data[0];
    }

    $cp_info = array('cp_code' => '');
    $cp_file_data = file(dirname(__FILE__).'/files/campaign_list.txt');
    foreach ($cp_file_data as $data) {
        $param = explode(',', $data);
        if ($cpid == trim($param[0])) {
            $add_part_name = array();
            $add_part_name[1] = trim($param[5]);
            $add_part_name[2] = trim($param[6]);
            $add_part_name[3] = trim($param[7]);
            $add_part_name[4] = trim($param[8]);
            $add_part_name[5] = trim($param[9]);
            $add_part_name[6] = trim($param[10]);

            $tag_part = array();
            $tag_part[1] = trim($param[11]);

            $app_link_ios = trim($param[12]);
            $app_link_android = trim($param[13]);

            $cp_info['cp_code'      ] = $cp_code;
            $cp_info['cp_point'     ] = trim($param[1]);
            $cp_info['cp_name'      ] = trim($param[2]);
            $cp_info['cp_portal'    ] = trim($param[3]);
            $cp_info['template_name'] = trim($param[4]);
            $cp_info['add_part_name'] = $add_part_name;
            $cp_info['tag_part'     ] = $tag_part;
            $cp_info['tp_code'      ] = '';
            $cp_info['extra'        ] = array();

            if ($app_link_ios && $app_link_ios != '') {
                $cp_info['app_link_ios'] = $app_link_ios;
            }
            if ($app_link_android && $app_link_android != '') {
                $cp_info['app_link_android'] = $app_link_android;
            }

            if ($cp_info['template_name'] == '') {
                $cp_info['template_name'] = $DEFAULT_TEMPLATE_FILE;
                $cp_info['add_part_name'] = $DEFAULT_ADDPART_ARRAY;
                $cp_info['tag_part'     ] = $DEFAULT_TAGPART_ARRAY;
            }

            // 特殊テンプレート対応
            $cp_info = load_group_template($cp_info);
            $cp_info = load_dorekiru_template($cp_info);
            $cp_info = load_new_template($cp_info);
            break;
        }
    }

    return $cp_info;
}

// 指定されたCP_CODEと同じグループから広告情報を読み込む
// @param gid string 対象のグループCP_CODE
// グループIDは yahoo_ad23 のような形で指定され、
// 登録されている広告情報一覧から、最後の１文字以外は一致する広告を
// 全てリストアップし、そのリストの中からラウンドロビンで選択された
// 広告の設定情報を返却する。
// 先ほどの例からいうと、yahoo_ad23A, yahoo_ad23B, yahoo_ad23C, yahoo_ad23D
// の４つが登録されていた場合、その４つを閲覧されるたびに順繰りに表示する
function load_cp_info_by_group($gid)
{
    if (strpos($gid, 'tid') === 0) {
        $target = db()->query("select cp_code from gid_group where gid=$1 and enable='t'", $gid);
        if (!$target) {
            return load_cp_info($gid);
        }

        $win = db()->query_value("select win from gid_group_settings where gid=$1", $gid);
        if ($win) {
            return load_cp_info($win);
        }

        $expects = array();
        foreach ($target as $cp) {
            $expects[] = $cp['cp_code'];
        }
        $func = function($cpid) use (&$expects) {
            foreach ($expects as $expect) {
                if ($expect == $cpid) {
                    return true;
                }
            }
            return false;
        };
    } else {
        $gidlen = strlen($gid) + 1;
        $func = function($cpid) use ($gid, $gidlen) {
            if (preg_match('/'.$gid.'./', $cpid) && ($gidlen == strlen($cpid))) {
                return true;
            }
            return false;
        };
    }

    $default = null;
    $cp_id_table = array();
    $cp_file_data = file(dirname(__FILE__).'/files/campaign_list.txt');
    foreach ($cp_file_data as $data) {
        $param = explode(',', $data);
        $cpid = trim($param[0]);
        if ($func($cpid)) {
            array_push($cp_id_table, $cpid);
        }
    }

    if (($id_num = count($cp_id_table)) == 0) {
        return load_cp_info($gid);
    }

    // main
    $fp_lock = @fopen("./data/counter_$gid.lock", 'r+');
    if (!$fp_lock) {
        $fp_lock = fopen("./data/counter_$gid.lock", 'w');
    }
    flock($fp_lock, LOCK_EX);

    $counter = (int) implode(file("./data/counter_$gid.txt"));
    $target_id = $cp_id_table[$counter % $id_num];
    ++$counter;

    if ($fp = fopen("./data/counter_$gid.txt", w)) {
        flock($fp, LOCK_EX);
        fwrite($fp, $counter);
        flock($fp, LOCK_UN);
        fclose($fp);
    }
    flock($fp_lock, LOCK_UN);

    return load_cp_info($target_id);
}

// gid 指定で LP を利用する際に F5 リロードしても、同一の LP テンプレートを返す関数
function load_cp_info_by_cookie($gid)
{
    global $DEFAULT_TEMPLATE_FILE, $DEFAULT_ADDPART_ARRAY, $DEFAULT_TAGPART_ARRAY;
    global $COOKIE_PREFIX;

    $cp_code = (string)filter_input(INPUT_COOKIE, $COOKIE_PREFIX.'HOTMJ_CAMPAIGN', FILTER_SANITIZE_SPECIAL_CHARS);

    if ($cp_code && strpos($cp_code, $gid) === 0) {
        $cp_file_data = file(dirname(__FILE__).'/files/campaign_list.txt');
        foreach ($cp_file_data as $data) {
            $param = explode(',', $data);
            $cpid = trim($param[0]);
            if ($cpid === $cp_code) {
                return load_cp_info($cp_code);
            }
        }
    }

    return load_cp_info_by_group($gid);
}

// 指定されたキャンペーンコード及びポータルコードをCOOKIEに設定する。
// 設定された各種コードは登録時のreg_from, cp_codeに利用される
// ただし、
function set_mj_campaign_cookie($cp_code, $cp_portal)
{
    global $STATIC_ISP_URL;
    global $COOKIE_PREFIX, $COOKIE_DOMAIN;

    //キャンペーンコード埋め込みクッキーをセット
    $cookie_campaign = $COOKIE_PREFIX.'HOTMJ_CAMPAIGN';
    $limit_campaign = time() + (60 * 60 * 24 * 14);
    $path_campaign = '/';
    setcookie($cookie_campaign, $cp_code, $limit_campaign, $path_campaign, $COOKIE_DOMAIN);

    if (($cp_code != $cp_portal) && array_key_exists($cp_portal, $STATIC_ISP_URL)) {
        $cookie_from = 'HOTMJ_FROM';
        $limit_from = time() + (60 * 60 * 24 * 14);
        $path_from = '/';
        setcookie($cookie_from, $cp_portal, $limit_from, $path_from);
    }

    return true;
}

// アクセストレード広告タグ
// Schedule #63994
function set_accesstrade_cookie($atss_code)
{
    global $STATIC_ISP_URL;
    global $COOKIE_PREFIX, $COOKIE_DOMAIN;

    $cookie_name = $COOKIE_PREFIX .'ACCESSTRADE_ATSS';
    $limit_campaign = time() + (60 * 60 * 24 * 90); // 先方指定 90 日以上
    $path_campaign = '/';

    // 先方指定 HttpOnly 属性 Secure 属
    setcookie($cookie_name, $atss_code, $limit_campaign, $path_campaign, $COOKIE_DOMAIN, TRUE, TURE);

    return true;
}

function view_mj_campaign_page($cp_info)
{
    //キャンペーンページの表示
    $cp_code = $cp_info['cp_code'];
    $cp_name = $cp_info['cp_name'];
    $cp_point = $cp_info['cp_point'];
    $tp_code = $cp_info['tp_code'];
    $target_filename = dirname(__FILE__).'/files/'.$cp_info['template_name'];
    $table = $cp_info['extra'];

    // OSによる出し分け
    if (($suffix = user_os_suffix()) != '') {
        $pathext = pathinfo($target_filename, PATHINFO_EXTENSION);
        if ($pathext != '') {
            $pathrc = preg_replace('/\.'.$pathext.'$/', "{$suffix}.{$pathext}", $target_filename);
        } else {
            $pathrc .= $suffix;
        }
        if (is_readable($pathrc)) {
            $target_filename = $pathrc;
        }
    }

    // TAG PART の処理
    $add_part_name = $cp_info['add_part_name'];
    for ($no = 1; $no <= 6; ++$no) {
        $content_part = '';
        if ($add_part_name[$no] != '') {
            /*
             * phpファイルの動的読み込み対応
             * 対象phpファイルで生成物をreturnする
             */
            $part_names = explode('?', $add_part_name[$no]);
            $filename = $part_names[0];
            $ext = pathinfo($filename, PATHINFO_EXTENSION);
            if (isset($part_names[1])) {
                // GET呼び出しへの対応
                $gets = explode('&', $part_names[1]);
                foreach ($gets as $get) {
                    list($get_index, $get_value) = explode('=', $get);
                    $_GET[$get_index] = $get_value;
                }
            }

            if ($ext === 'php') {
                $part_filename = dirname(__FILE__).'/files/'.$filename;
                $part_filename = find_ua_file($part_filename);
                $content_part = require $part_filename;
            } else {

              /*
              // 追加：virtual nanikiru(t + qno) 対応
              if (preg_match('/virtual_nanikiru_t(\d+)_\{(\d+)\}\.html$/', $add_part_name[$no], $m)) {
                  $t = $m[1];
                  $qno = $m[2];

                  $content_part = '<iframe id="js-nanikiru-iframe" '
                      . 'src="//www2.maru-jan.com/sys/campaign/nanikiru/nanikiru.php?qno=' . $qno . '&t=' . $t . '&after=view" '
                      . 'frameborder="0" width="880" height="200" marginwidth="0" marginheight="0" scrolling="no"></iframe>';
              */

              // 追加：virtual nanikiru t15 対応
              if (preg_match('/virtual_nanikiru_t15_\{(\d+)\}\.html$/', $add_part_name[$no], $m)) {
                  $qno = $m[1];
                  $content_part = '<iframe id="js-nanikiru-iframe" '
                      . 'src="//www2.maru-jan.com/sys/campaign/nanikiru/nanikiru.php?qno=' . $qno . '&t=015&after=view" '
                      . 'frameborder="0" width="880" height="200" marginwidth="0" marginheight="0" scrolling="no"></iframe>';
              } else {
                // 拡張子がphp以外の場合は単純ファイル読み込み
                $part_filename = dirname(__FILE__).'/files/'.$add_part_name[$no];
                $part_filename = find_ua_file($part_filename);
                $content_part = file_get_contents($part_filename);
              }

            }
        }
        $table['add_part'.$no] = $content_part;
    }

    // タグパート処理
    $table['tag_part1'] = @$cp_info['tag_part'][1];

    // MJIリンク処理
    $table['app_link_ios'] = isset($cp_info['app_link_ios']) ? $cp_info['app_link_ios'] : 'https://itunes.apple.com/jp/app/id816142637?l=ja&ls=1&mt=8&at=1l3vpsg&ct=mobileindex';
    $table['app_link_android'] = isset($cp_info['app_link_android']) ? $cp_info['app_link_android'] : 'https://play.google.com/store/apps/details?id=com.signaltalk.mji';

    // norton_safeweb_site_verification Ref: #72019
    $cp_code_norton_code_list = array(
      'tenpai_g_dvd_ad01'     => 'ERQYVH2KTMA7DIZJT25OW0QFQK073HNIF8SLTA4WJTN99W-K2KKM5SNX3E-A-NW2SGSKHP1ST0QVK2WUL78LH8YI-BP1XG3A2KDUHNO3XF1139QZE5YR8PTJHOPJ-LX4', // 088
      'line_manga_ad01'       => 'QGJ6EYDUX9TY3XQ5L9WCUTFGNT4FXFTIQYA08MNL26EGWF8GTQV97WFHSK9F3FKYCJCMK1V-FJ3NL5KHR4HSXFGOH4I9C9IRS5JCIFKPMAR3T9NS7OID99FBS1IZ0SCE', // 099
      'gendai_nmc_pr01'       => '8O2O8WAGXOG2UC249FQAA7OOIWOUOW8GC2255AES230Q32TY216PM4LVNMPD4V1A-FW7VCHT525-YVIF377U237G7VJ6NSYYZTKNFBTAUJ73CUVLT5OPYYR3FV1NF3P5', // 111
      'tvasahi_ch_ad01'       => 'IMVKCK8BQ6QGYS998SV7KBHE3B1OL-DE4CPCQLCN9Z61RW4XE0D3FAV9OOQAGP00BRPMDGE5OMDLCY67UR6V6MTZ6UW69JYLT58FBK4WV3QFZT3MT8K0ONSCM5VBXP1U', // 123
      'nishinihon_news_ad01a' => 'X0O3C36MDB8D123APT9G9KWM1ZS5JLODBRR6YB4PGLPSQMOU6BANP3HIM7SQ4ISKP--F6NBJEAM432PZ0IEKQE74N8M4426BN2F5E8SOP7-9200F7NZYGLUPVKBJF36G', // 222
      'nishinihon_news_ad01b' => 'Y8HFJ586BOVN11NIOO26C09I6A8Q2-HJUCPQ038E9NL9BRQ7JIR8ULH9TRPK7FE4AZD3PL4Z5GXCTY8W44N9GHCI-9ZIBPL0XHWJ385Q4UADU21UAQL6KJM19JMKMCQD', // 333
      'goraku_nmc_ad09'       => 'UZ275RWM-HGWLHB1IKNJMDYYLMFDF459TN692XYU3MQWMKZ2GW4U3YMP4HVR4IUVK0X3TWQDDJ1WWOT74V54C4H575WOA9R9DKG3TVM4PTQTQKTCG6FQWCIYJ5HA1K0K', // 555
      'gendai_ad02'           => 'KEMETWFE-T8JEW724GL6S-VA9LXJQURMXBUP14VI339SVZLSZ9XOZOAOY52GSWJ-8IJ3BIV6G36ZXQID36WUWVZHVFJXDLEMRIF06EG69HRLF1DF70Z30-39-N9Q-6VJ', // 777
      'abema_tv_ad06'         => 'F8NAO-8-9E651S7JW3OQXW2XD9XM8SIVQILHHP9B6OKTGW7P2TV8PHWFSPPFWVAI55WZ6CUTAMXZRSRPQ4XF4K8QLQ524MZG2NN691--SCWWOLHMZMQO4PUF8OHWQLX7', // 888
      'mj_adcard'             => 'AQALXYIN8OKRD5PSE53GN84K8VVQBU4KZBCICVK7L6PJTEDMXB6PQ1448GBGVE5P3GIVJ6SI1I8JYWZGLT7GL8NLIEB1R8NNXJXR1WW627PO0AMICXOXMEWVFUHECL3H', // 999
    );

    $table['norton_safeweb_site_verification'] = '';
    foreach ($cp_code_norton_code_list as $norton_key => $norton_value) {
      if ($table['norton_safeweb_site_verification'] === '') {
        $table['norton_safeweb_site_verification'] = $cp_code === $norton_key ? $norton_value : '';
      }
    }

    $cp_image = "/image/cplogo_{$cp_code}.jpg";
    if (is_readable(dirname(__FILE__).$cp_image)) {
        $self_path = '/'.str_replace(PUBLIC_HOME, '', dirname(__FILE__));
        $cp_name = '<img src="'.$self_path.$cp_image.'" border="0">';
    }

    global $AD_SERVER_ADDR;
    $table['cp_code'] = $cp_code;
    $table['cp_point'] = $cp_point;
    $table['cp_name'] = $cp_name;
    $table['tp_code'] = $tp_code;
    $table['ad_server_url'] = 'http://'.$AD_SERVER_ADDR;
    $table['signaltalk_url'] = $GLOBALS['SIGNALTALK_URL'];
    $table['raw_mode'] = true;
    if (empty($table['from'])) {
        $from = get_session_portal();
        if ($from == 'ios' || $from == 'android') {
            $table['from'] = $from;
        }
    }
    $table['ua'] = Http::analyze_ua();
    $target_filename = find_ua_file($target_filename);
    $contents = twango_str($target_filename, $table);
    $contents = preg_replace('#([\'"\(])//www\.#', '$1https://ssl-www.', $contents);
    print $contents;
}


function redirect_page($cp_info) {
    $url = '/sys/campaign/set.php?id=err_redirect';
    if ($cp_info['template_name'] == 'redirect:store') {
        $os = get_user_os();
        if (strpos($os,'Android') !== false) {
            $url = isset($cp_info['app_link_android']) ? $cp_info['app_link_android'] : 'https://play.google.com/store/apps/details?id=com.signaltalk.mji';
        } else if ($os == 'iOS' || $os == 'Mac') {
            $url = isset($cp_info['app_link_ios']) ? $cp_info['app_link_ios'] : 'https://itunes.apple.com/jp/app/id816142637?l=ja&ls=1&mt=8&at=1l3vpsg&ct=mobileindex';
        }
    } else {
        $url = substr($cp_info['template_name'], strlen('redirect:'));
    }

    \Http::redirect($url);
}

function execute_last_cpcode_record($cp_code)
{
    // ここからラストキャンペーン計測
    global $my_cookie_pass;
    $value_pass = '';
    // クッキーの確認
    if (isset($_COOKIE['HOTMJ_PASS'])) {
        $value_pass = $_COOKIE['HOTMJ_PASS'];
    } elseif (isset($_COOKIE[$my_cookie_pass])) {
        $value_pass = $_COOKIE[$my_cookie_pass];
    }
    if ($value_pass != '') {
        $val = explode(' ', $value_pass);
        $ck_login_id = $val[0];
        if ($ck_login_id != '') {
            $FILENAME_LASTCP_LOCK = ROOT_PATH.'log/last_cpcode_record.lock';
            $FILENAME_LASTCP_OUTPUT = ROOT_PATH.'data/statistics/last_cpcode_record.csv';

            //ロック
            $fp_lock = @fopen($FILENAME_LASTCP_LOCK, 'r+');
            if (!$fp_lock) {
                $fp_lock = fopen($FILENAME_LASTCP_LOCK, 'w');
            }
            flock($fp_lock, LOCK_EX);
            {
                // 出力は、時刻とパラメータの実データ
                $output = date('Y-m-d G:i:s').','.$_SERVER['REMOTE_ADDR'].','.$cp_code.','.$ck_login_id.','.$_SERVER['HTTP_USER_AGENT']."\n";

                // ファイルに追記
                $handle = fopen($FILENAME_LASTCP_OUTPUT, 'a');
                if ($handle) {
                    fwrite($handle, $output);
                    fclose($handle);
                }
            }

            flock($fp_lock, LOCK_UN);
            fclose($fp_lock);
        }
    }
}

//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////   utility   ///////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
function load_group_template($cp_info)
{
    if (isset($cp_info['template_name']) == false) {
        return $cp_info;
    }
    if (strpos($cp_info['template_name'], 'group_template_') === false) {
        return $cp_info;
    }

    // オートテンプレート
    $cp_code = $cp_info['cp_code'];
    $template_name = $cp_info['template_name'];
    $template_table = @file(dirname(__FILE__)."/files/{$template_name}");
    $template_num = count($template_table);

    // カウンターで順番に出す→キャンペーンコード毎
    $work_path = dirname(__FILE__).'/group_template/';
    $work_base = "{$work_path}/{$template_name}_{$cp_code}";

    //ロック
    $fp_lock = @fopen("{$work_base}.lock", 'r+');
    if (!$fp_lock) {
        $fp_lock = fopen("{$work_base}.lock", 'w');
    }
    flock($fp_lock, LOCK_EX);

    $counter = (int) file_get_contents("{$work_base}_counter.txt");

    $target_template_data = explode(',', $template_table[($counter % $template_num)]);

    $tp_code = trim($target_template_data[0]);
    $target_template_name = trim($target_template_data[1]);
    ++$counter;

    if ($fp = fopen("{$work_base}_counter.txt", w)) {
        fwrite($fp, $counter);
        fclose($fp);
    }

    // ロック終わり
    flock($fp_lock, LOCK_UN);

    $cp_info['tp_code'      ] = $tp_code;
    $cp_info['template_name'] = $target_template_name;

    return $cp_info;
}

function load_dorekiru_template($cp_info)
{
    if (isset($cp_info['template_name']) == false) {
        return $cp_info;
    }
    if (strpos($cp_info['template_name'], 'dorekiru_template_') === false) {
        return $cp_info;
    }

    $template_name = $cp_info['template_name'];

    //どれ切るテンプレート対応
    $template_table = @file(dirname(__FILE__)."/files/{$template_name}");
    $answer_no = @$_GET['answer'];
    if (($answer_no == '') || !(preg_match('/[0-9]/', $answer_no))) {
        $answer_no = 0;
    }
    $target_template_data = explode(',', $template_table[$answer_no]);

    $target_template_name = trim($target_template_data[1]);
    $target_answer_name = trim($target_template_data[2]);

    $cp_info['extra']['answer_html'] = file_get_contents(dirname(__FILE__).'/files/'.$target_answer_name);
    $cp_info['template_name'] = $target_template_name;

    return $cp_info;
}

function load_new_template($cp_info)
{
    global $my_cookie_pass;
    if (isset($cp_info['template_name']) == false) {
        return $cp_info;
    }
    if (strpos($cp_info['template_name'], 'template_new_') === false) {
        return $cp_info;
    }

    // 既存会員出し分け
    // ここからラストキャンペーン計測
    $value_pass = '';

    // クッキーの確認
    if (isset($_COOKIE['HOTMJ_PASS'])) {
        $value_pass = $_COOKIE['HOTMJ_PASS'];
    } elseif (isset($_COOKIE[$my_cookie_pass])) {
        $value_pass = $_COOKIE[$my_cookie_pass];
    }

    if ($value_pass != '') {
        $val = explode(' ', $value_pass);
        $ck_login_id = $val[0];
        if ($ck_login_id != '') {
            // ここにきたら出し分ける
            $cp_info['template_name'] = str_replace('template_new_', 'template_mem_', $cp_info['template_name']);
        }
    }

    return $cp_info;
}

if (!function_exists('get_user_os')) {
    function get_user_os()
    {
        global $SERVERMODE;
        if (get('os') != '' && ($SERVERMODE != 'SERVICE' || (get('magic') == 'segadna' || (isset($_COOKIE['magic']) && $_COOKIE['magic'] == 'segadna')))) {
            $os = get('os');
            $omit = array('xp' => 'WindowsXP', 'XP' => 'WindowsXP', 'vista' => 'WindowsVista', '7' => 'Windows7', '8' => 'Windows8', 'ios' => 'iOS', 'android' => 'Android', 'mac' => 'Mac');

            return array_key_exists($os, $omit) ? $omit[$os] : $os;
        }

        $agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;
        if (strpos($agent, 'Windows Phone') !== false) {
            $os = 'WindowsPhone';
        } elseif (strpos($agent, 'BlackBerry') !== false) {
            $os = 'BlackBerry';
        } elseif (strpos($agent, 'Windows NT 6.2') !== false) {
            $os = 'Windows8';
        } elseif (strpos($agent, 'Windows NT 6.1') !== false) {
            $os = 'Windows7';
        } elseif (strpos($agent, 'Windows NT 6.0') !== false) {
            $os = 'WindowsVista';
        } elseif (strpos($agent, 'Windows NT 5.1')  !== false || strpos($agent, 'Windows NT 5.2') !== false) {
            $os = 'WindowsXP';
        } elseif (strpos($agent, 'iPhone') !== false || strpos($agent, 'iPad') !== false) {
            $os = 'iOS';
        } elseif (strpos($agent, 'Android') !== false) {
            $suffix = (preg_match('/Android\s(\d+)/', $agent, $m)) ? $m[1] : '';
            $os = 'Android'.$suffix;
        } elseif (strpos($agent, 'Mac') !== false) {
            $os = 'Mac';
        } else {
            $os = null;
        }

        return $os;
    }
}

function user_os_suffix($os = null)
{
    if ($os === null || $os === false) {
        $os = get_user_os();
    }
    switch ($os) {
    case 'WindowsPhone':
        return '_wp';
    case 'BlackBerry':
        return '_bb';
    case 'Windows8':
        return '_8';
    case 'Windows7':
        return '_7';
    case 'WindowsVista':
        return '_vista';
    case 'WindowsXP':
        return '_XP';
    case 'iOS':
        return '_ios';
    case 'Android':
        return '_android';
    case 'Mac':
        return '_mac';
    }

    return '';
}

function find_ua_file($filename)
{
    $ua = Http::analyze_ua();
    if ($ua) {
        $fn = preg_replace('{\.([^/]+)$}', "_$ua.$1", $filename);
        if (is_file($fn)) {
            $filename = $fn;
        }
    }

    return $filename;
}