// twister_formatpost.js
// 2013 Miguel Freitas
//
// Format JSON posts and DMs to HTML.


// format "userpost" to html element
// kind = "original"/"ancestor"/"descendant"
function postToElem( post, kind, promoted ) {
    /*
    "userpost" :
    {
            "n" : username,
            "k" : seq number,
            "t" : "post" / "dm" / "rt"
            "msg" : message (post/rt)
            "time" : unix utc
            "height" : best height at user
            "dm" : encrypted message (dm) -opt
            "rt" : original userpost - opt
            "sig_rt" : sig of rt - opt
            "reply" : - opt
            {
                    "n" : reference username
                    "k" : reference k
            }
    }
    "sig_userpost" : signature by userpost.n
    */

    // Obtain data from userpost
    var postJson = $.toJSON(post);
    var userpost = post["userpost"];
    if( "rt" in userpost ) {
        var rt = userpost["rt"];
        var n = rt["n"];
        var k = rt["k"];
        var t = rt["time"];
        var msg = rt["msg"];
        var content_to_rt = $.toJSON(rt);
        var content_to_sigrt = userpost["sig_rt"];
        var retweeted_by = userpost["n"];
    } else {
        var n = userpost["n"];
        var k = userpost["k"];
        var t = userpost["time"];
        var msg = userpost["msg"]
        var content_to_rt = $.toJSON(userpost);
        var content_to_sigrt = post["sig_userpost"];
        var retweeted_by = undefined;
    }

    // Now create the html elements
    var elem = $.MAL.getPostTemplate().clone(true);
    elem.removeAttr('id')
        .addClass(kind)
        .attr('data-time', t)
    ;

    if( post['isNew'] )
        elem.addClass('new');

    var postData = elem.find('.post-data');
    postData.addClass(kind)
        .attr('data-userpost', postJson)
        .attr('data-content_to_rt', content_to_rt)
        .attr('data-content_to_sigrt', content_to_sigrt)
        .attr('data-screen-name', n)
        .attr('data-id', k)
        .attr('data-lastk', userpost["lastk"])
        .attr('data-text', msg)
    ;
    if( 'reply' in userpost ) {
        postData.attr('data-replied-to-screen-name', userpost.reply.n)
            .attr('data-replied-to-id', userpost.reply.k)
            .find('.post-expand').text(polyglot.t('Show conversation'))
        ;
    } else if ( 'rt' in userpost && 'reply' in userpost.rt ) {
        postData.attr('data-replied-to-screen-name', userpost.rt.reply.n)
            .attr('data-replied-to-id', userpost.rt.reply.k)
            .find('.post-expand').text(polyglot.t('Show conversation'))
        ;
    }

    var postInfoName = elem.find('.post-info-name');
    postInfoName.text(n).attr('href', $.MAL.userUrl(n));
    getFullname( n, postInfoName );
    //elem.find('.post-info-tag').text("@" + n);
    getAvatar( n, elem.find('.avatar') );
    elem.find('.post-info-time').text(timeGmtToText(t)).attr('title', timeSincePost(t));

    var mentions = [];
    elem.find('.post-text').html(htmlFormatMsg(msg, mentions));
    postData.attr('data-text-mentions', mentions);

    var replyTo = [];
    if( n !== defaultScreenName )
        replyTo.push(['@', n, ' '].join(''));
    for (var i = 0; i < mentions.length; i++) {
        if (mentions[i] !== n && mentions[i] !== defaultScreenName)
            replyTo.push(['@', mentions[i], ' '].join(''));
    }
    replyTo = replyTo.join('');

    var postTextArea = elem.find('.post-area-new textarea');
    postTextArea.attr('data-reply-to', replyTo);
    if (!defaultScreenName)
        postTextArea.attr('placeholder', polyglot.t('You have to log in to post replies.'));
    else
        postTextArea.attr('placeholder', polyglot.t('reply_to', { fullname: replyTo })+ '...');

    postData.attr('data-reply-to', replyTo);

    if( retweeted_by != undefined ) {
        elem.find('.post-context').show();
        elem.find('.post-retransmited-by')
            .attr('href', $.MAL.userUrl(retweeted_by))
            .text('@' + retweeted_by)
        ;
    }

    if (typeof(promoted) !== 'undefined' && promoted) {
        elem.find('.post-propagate').remove();
    } else {
        if ($.Options.filterLang.val !== 'disable' && $.Options.filterLangSimulate.val) {
            // FIXME it's must be stuff from template actually
            if (typeof(post['langFilter']) !== 'undefined') {
                if (typeof(post['langFilter']['prob'][0]) !== 'undefined')
                    var mlm = '  //  '+polyglot.t('Most possible language: this', {'this': '<em>'+post['langFilter']['prob'][0].toString()+'</em>'});
                else
                    var mlm = '';

                elem.append('<div class="langFilterSimData">'+polyglot.t('This post is treated by language filter', {'treated': '<em>'+((post['langFilter']['pass']) ? polyglot.t('passed') : polyglot.t('blocked'))+'</em>'})+'</div>')
                    .append('<div class="langFilterSimData">'+polyglot.t('Reason: this', {'this': '<em>'+post['langFilter']['reason']+'</em>'})+mlm+'</div>')
                ;
            } else {
                elem.append('<div class="langFilterSimData">'+polyglot.t('This post is treated by language filter', {'treated': '<em>'+polyglot.t('not analyzed')+'</em>'})+'</div>');
            }
        }
    }

    return elem;
}

// format dmdata (returned by getdirectmsgs) to display in "snippet" per user list
function dmDataToSnippetItem(dmData, remoteUser) {
    var dmItem = $("#dm-snippet-template").clone(true);
    dmItem.removeAttr('id');
    dmItem.attr("data-dm-screen-name",remoteUser);
    dmItem.attr("data-last_id", dmData.id);
    dmItem.attr("data-time", dmData.time);

    dmItem.find(".post-info-tag").text("@" + remoteUser);
    dmItem.find("a.post-info-name").attr("href", $.MAL.userUrl(remoteUser));
    dmItem.find("a.dm-chat-link").attr("href", $.MAL.dmchatUrl(remoteUser));
    getAvatar( remoteUser, dmItem.find(".post-photo").find("img") );
    if( remoteUser.length && remoteUser[0] === '*' )
        getGroupChatName( remoteUser, dmItem.find("a.post-info-name") );
    else
        getFullname( remoteUser, dmItem.find("a.post-info-name") );
    dmItem.find(".post-text").html(escapeHtmlEntities(dmData.text));
    dmItem.find(".post-info-time").text(timeGmtToText(dmData.time)).attr("title",timeSincePost(dmData.time));

    return dmItem;
}

// format dmdata (returned by getdirectmsgs) to display in conversation thread
function dmDataToConversationItem(dmData, localUser, remoteUser) {
    var classDm = dmData.fromMe ? "sent" : "received";
    var dmItem = $("#dm-chat-template").clone(true);
    dmItem.removeAttr('id');
    dmItem.addClass(classDm);
    getAvatar(dmData.fromMe ? localUser : remoteUser, dmItem.find(".post-photo").find("img") );
    dmItem.find(".post-info-time").text(timeGmtToText(dmData.time)).attr("title",timeSincePost(dmData.time));
    var mentions = [];
    dmItem.find('.post-text').html(htmlFormatMsg(dmData.text, mentions));

    return dmItem;
}

// convert message text to html, featuring @users and links formating.
function htmlFormatMsg(msg, mentions) {
    function htmlMention(str, pre) {
        str = str.replace(new RegExp(['^', pre, '@'].join('')), '').toLowerCase();

        mentions.push(str);  // FIXME feel the pain of the scope chain

        // FIXME we're trying to not interact with DOM, coz' we want to run really fast [to hell of RegExps]
        // FIXME actually we should avoid it by dropping a template idea and construct html right here
        html.push($('#msg-user-link-template')[0].outerHTML
            .replace(/\bid\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('id')
            //.replace(/\bhref\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('href')
            .replace(/<a\s+(?=[^>]*?\bclass\s*=\s*"(?=[^"]*?\bopen-profile-modal\b))/ig, ['<a href="', $.MAL.userUrl(str), '" '].join(''))  // $().closest('a.open-profile-modal').attr('href', $.MAL.userUrl(username))
            .replace(/(<a\s+(?=[^>]*?\bclass\s*=\s*"(?=[^"]*?\bopen-profile-modal\b))[^]*?>)[^]*?(<\/a>)/ig, [pre, '$1@', str, '$2'].join(''))  // $().closest('a.open-profile-modal').text('@'+username)
        );

        return ['>', html.length - 1, '<'].join('');
    }

    function htmlHashtag(str, pre) {
        str = str.replace(new RegExp(['^', pre, '#'].join('')), '');

        html.push($('#hashtag-link-template')[0].outerHTML
            .replace(/\bid\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('id')
            //.replace(/\bhref\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('href')
            .replace(/<a\s+(?=[^>]*?\bclass\s*=\s*"(?=[^"]*?\bopen-hashtag-modal\b))/ig, ['<a href="', $.MAL.hashtagUrl(str.toLowerCase()), '" '].join(''))  // $().closest('a.open-profile-modal').attr('href', $.MAL.hashtagUrl(hashtag))
            .replace(/(<a\s+(?=[^>]*?\bclass\s*=\s*"(?=[^"]*?\bopen-hashtag-modal\b))[^]*?>)[^]*?(<\/a>)/ig, [pre, '$1#', str, '$2'].join(''))  // $().closest('a.open-profile-modal').text('#'+hashtag)
        );

        return ['>', html.length - 1, '<'].join('');
    }

    function htmlHttp(str) {
        html.push($('#external-page-link-template')[0].outerHTML
            .replace(/\bid\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('id')
            //.replace(/\bhref\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('href')
            .replace(/<a\s+/ig, ['<a href="', proxyURL(str), '" '].join(''))  // $().closest('a').attr('href', proxyURL(url))
            .replace(/(<a\s+[^]*?>)[^]*?(<\/a>)/ig, ['$1', str, '$2'].join(''))  // $().closest('a').text(url)
        );

        return ['>', html.length - 1, '<'].join('');
    }

    function htmlEmail(str, pre) {
        str = str.replace(new RegExp(['^', pre].join('')), '');

        html.push($('#external-page-link-template')[0].outerHTML
            .replace(/\bid\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('id')
            //.replace(/\bhref\s*=\s*"[^]*?"+/ig, '')  // $().removeAttr('href')
            .replace(/<a\s+/ig, ['<a href="mailto:', str.toLowerCase(), '" '].join(''))  // $().closest('a').attr('href', 'mailto:'+url)
            .replace(/(<a\s+[^]*?>)[^]*?(<\/a>)/ig, [pre, '$1', str, '$2'].join(''))  // $().closest('a').text(url)
        );

        return ['>', html.length - 1, '<'].join('');
    }

    function htmlSplitCounter(str) {
        html.push(['<span class="splited-post-counter">', str, '</span>'].join(''));

        return ['>', html.length - 1, '<'].join('');
    }

    var html = [];

    return _formatText(escapeHtmlEntities(msg)
        .replace(/(^|[^\/]\B(?!\S*:\/\/\S*@))@\w+\b/g, htmlMention)
        .replace(/(^|[^<\/]\B(?!\S*:\/\/\S*#))#[^#\\\/\.,:;\?\!\*\[\]\(\)\{\}\^\|%'"\u201C\u201D\u2026\u2014\u4E00\u3002\uFF0C\uFF1A\uFF1F\uFF01\u3010\u3011>\s]+/g, htmlHashtag)  // unicode escaped stuff is '“”…—一。，：？！【】' for our chinese friends
        .replace(/\bhttps?:\/\/\S[^>\s]+/ig, htmlHttp)
        .replace(/([^<\/])\b(?!\S*:\/\/\S*@)\S+@\S+\.\S[^>\s]+/g, htmlEmail)
        .replace(/\(\d{1,2}\/\d{1,2}\)$/, htmlSplitCounter)
        .replace(/>(\d+)</g, function(candy, core) {return html[core]})
    );
}

function proxyURL(url) {
    var proxyOpt = $.Options.useProxy.val;
    if (proxyOpt !== 'disable' && !$.Options.useProxyForImgOnly.val) {
        // proxy alternatives may be added to options page
        if (proxyOpt === 'ssl-proxy-my-addr') {
            url = ['https://ssl-proxy.my-addr.org/myaddrproxy.php/',
                url.substring(0, url.indexOf(':')), url.substr(url.indexOf('/') + 1)].join('');
        } else if (proxyOpt === 'anonymouse')
            url = ['http://anonymouse.org/cgi-bin/anon-www.cgi/', url].join('');
    }

    return url;
}

// internal function for htmlFormatMsg
    // TODO: add options for emotions; msg = $.emotions(msg);
    // TODO: add at least basic markdown (optional) like *text* -> bold text and _text_ -> italic text
function _formatText(msg) {
    if ($.Options.displayLineFeeds.val === 'enable')
        msg = msg.replace(/\n/g, '<br />');

    return msg;
}

function escapeHtmlEntities(str) {
    return str
                .replace(/&/g, '&amp;')
                .replace(/</g, '&lt;')
                .replace(/>/g, '&gt;')
                .replace(/"/g, '&quot;')
                .replace(/'/g, '&apos;');
}

function reverseHtmlEntities(str) {
    return str
                .replace(/&lt;/g, '<')
                .replace(/&gt;/g, '>')
                .replace(/&quot;/g, '"')
                .replace(/&apos;/g, "'")
                .replace(/&amp;/g, '&');
}