/*
Copyright 2011 Ville Rantanen

 This program is free software: you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published
 by the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
var maxThumb=10;
var uagent = navigator.userAgent.toLowerCase();
var pathlist=[];
var pathimage=[];
var imagelist=[];
var filelist=[];
var imagedesc=[];
var imagetime=[];
var marklist=[]
var currentimage=-1;
var currentlist=-1;
var originals=false;

function setup() {
    // Setup run at the load of page.
    if (notsupported()) {
        return;
    }
    hidethumbs();
    document.onkeydown=keypressed;
    var req=request();
    if (req!=-1) {
        showimage(req);
    } else {
        thumblist(0,-1);
        subfolderbiglist();
    }
    return;
}

function showimage(i) {
    // Main function to show a single image
    if (i>imagelist.length-1 || i<0) { return; }
    thumblist(i,i);
    showbigimage(i);
    preload(i);
    subfoldersmalllist();
    currentimage=i;
    return;
}

function showbigimage(i) {
    // The medium version of image in the big image container
    if (i==-1) { return; }
    ob=document.getElementById('imagecontainer');
    width=document.body.clientWidth-30;
    height=document.body.clientHeight-225;
    if (originals) { mediumstr=encodeURIComponent(imagelist[i]);  }
    else { mediumstr='_med/med_'+encodeURIComponent(imagelist[i])+'.jpg'; }
    ob.innerHTML='<div class="imagebig"><a href="'+encodeURIComponent(imagelist[i])+'" target="_blank"><img id="imagesingle" src="'+mediumstr+'"></a></div>';
    document.getElementById('imagesingle').style.maxWidth=width;
    ob.style.height=height;
    document.getElementById('imagesingle').style.maxHeight=height;
    dc=document.getElementById('desccontainer');
    dc.innerHTML=currentlink(i)+imagedesc[i];
    dc.style.display='block';
    return;
}

function currentlink(i) {
    // gets the search term for this image
    index = location.href.split("?");
    s='<a title="Link to this page" href="'+index[0]+'?q='+escape(imagelist[i])+'">['+String(i+1)+']</a> ';
    return s;
}

function preload(i) {
    // preloads left and right images
    if (imagelist.length==0) { return; }
    ob=document.getElementById('preloadcontainer');
    right=Math.max(0,i+1);
    right=Math.min(right,imagelist.length-1);
    left=Math.max(0,i-1);
    left=Math.min(left,imagelist.length-1);
    if (originals) { 
        prestr='<img src="'+encodeURIComponent(imagelist[left])+'" />';
        prestr+='<img src="'+encodeURIComponent(imagelist[right])+'" />'; 
    } else { 
        prestr='<img src="_med/med_'+encodeURIComponent(imagelist[left])+'.jpg" />';
        prestr+='<img src="_med/med_'+encodeURIComponent(imagelist[right])+'.jpg" />'; 
    }
    ob.innerHTML=prestr;
    return;
}

function thumblist(n,curr) {
    // creates the short thumbnail list
    maxThumb=getmaxthumbs();
    if (imagelist.length==0) { return; }
    ob=document.getElementById('thumbcontainer');
    ob.style.width=document.body.clientWidth-30;
    startI=Math.max(0,n+1-Math.round((maxThumb/2)));
    startI=Math.min(startI,imagelist.length-maxThumb);
    startI=Math.max(0,startI);
    endI=Math.min(startI+maxThumb,imagelist.length);
    currentlist=endI;
    nright=endI-Math.round((maxThumb/2))+maxThumb-1;
    nleft=nright-maxThumb-maxThumb;
    if (maxThumb%2==1) { nright+=1; nleft+=1; }
    leftstr='<span title="[shift left arrow]" id="arrowleft" class="thumbbox" onclick="thumblist('+String(nleft)+','+String(curr)+')">&larr; <div class="arrowtext">('+startI+')</div></span>';
    rightstr='<span title="[shift right arrow]" id="arrowright" class="thumbbox" onclick="thumblist('+String(nright)+','+String(curr)+')">&rarr; <div class="arrowtext">('+(imagelist.length-endI)+')</div></span>';
    menustr='<span id="thumbmenu" class="thumbmenu"><span id="allthumbs" class="menuitem" onclick="allthumbs()" title="show all thumbs">all thumbnails</span>'+
           '<span>Order:</span><span class="menuitem" id="sortalpha" onclick="sortlist(\'alpha\')">name</span>/'+
           '<span class="menuitem" id="sorttime" onclick="sortlist(\'time\')">time</span>/'+
           '<span class="menuitem" id="sortrev" onclick="sortlist(\'rev\')">reverse</span>'+
           '<span>Original:</span><span class="menuitem" id="originals" onclick="fliporiginals()">'+String(originals)+'</span></span>';
    thumbstr='<div><span class="headsmall">Images</span>'+menustr+'</div><div id="thumbrow">'+leftstr;
    for (i=startI; i<endI; i++) {
        thumbstr+='<span id="n'+i+'" class="imagebox thumbbox"><img class="thumbimage" title="'+titlestring(imagedesc[i])+'" onclick="showimage('+String(i)+')" src="_tn/tn_'+encodeURIComponent(imagelist[i])+'.jpg"><br/><a href="'+encodeURIComponent(imagelist[i])+'" target="_blank">'+nicestring((imagelist[i]))+'</a></span>';
    }
    thumbstr+=rightstr+'</div>';
    ob.innerHTML=thumbstr;
    if (curr>-1) {
        c=document.getElementById('n'+curr);
        if (c) {c.className="imagebox thumbbox rounded"; }
    }
    if (marklist.length>0) {
        for (m in marklist) {
            var mth=document.getElementById('n'+marklist[m])
            if (mth!=null) {
                mth.className+=" marked";
            }
        }
    }
    return;
}

function allthumbs() {
    // Shows all the thumbnails in the current folder
    ob=document.getElementById('thumbcontainer');
    thumbstr='<h2>Images</h2><div id="thumbrow">';
    for (i=0; i<imagelist.length; i++) {
        thumbstr+='<span id="n'+i+'" class="imagebox thumbbox"><img title="'+titlestring(imagedesc[i])+'" onclick="showimage('+String(i)+')" src="_tn/tn_'+(encodeURIComponent(imagelist[i]))+'.jpg"><br/><a href="'+(encodeURIComponent(imagelist[i]))+'" target="_blank">'+nicestring(imagelist[i])+'</a></span>';
    }
    thumbstr+='</div>';
    ob.innerHTML=thumbstr;
    ic=document.getElementById('imagecontainer');
    ic.innerHTML='';
    ic.style.height=0;
    dc=document.getElementById('desccontainer');
    dc.style.display='none';
    currentimage=-1;
    return;
}

function subfoldersmalllist() {
    // Shows a small subfolder list
    ob=document.getElementById('pathcontainer');
    pathstr='<span id="pathsmalllink">Subfolders: ';
    for (p=0; p<pathlist.length; p++) {
        pathstr+='<a href="'+encodeURI(pathlist[p][0])+'/index.html">'+nicestring(pathlist[p][0])+'</a>('+String(pathlist[p][1])+')/ ';
    }
    pathstr+='</span>';
    if (pathlist.length==0) {
        ob.innerHTML='';
    } else { ob.innerHTML=pathstr; }
    return;
}
function subfolderbiglist() {
    // Shows a subfolder list with thumbnails
    ob=document.getElementById('pathcontainer');
    pathstr='<h2>Subfolders:</h2>';
    for (p=0; p<pathlist.length; p++) {
        if (pathimage[p].length>0) {
            imgstr='<span class="pathbox" id="p'+p+'" style="background-image:url(\''+encodeURI(pathimage[p])+'\');">';
        } else { imgstr='<span class="pathbox" id="p'+p+'">'; }
        pathstr+='<a title="'+pathlist[p][0]+'" href="'+encodeURI(pathlist[p][0])+'/index.html">'+imgstr+'<span class="pathlink"><span class="pathlinktext">'+nicestring(pathlist[p][0])+' ('+String(pathlist[p][1])+')</span></span></span></a>';
    }
    if (pathlist.length==0) {
        ob.innerHTML='';
    } else { ob.innerHTML=pathstr; }
    return;
}
function sortlist(property) {
    // sorts the image list based on time or name, or reverse sort
    var templist=[]
    var tempmark=[]
    var tempcurrent=imagelist[currentimage];
    for (i in imagelist) {
        templist.push({name:imagelist[i], time:imagetime[i], desc:imagedesc[i]});
    }
    for (i in marklist) {
        tempmark.push(imagelist[marklist[i]]);
    }
    if (property=='time') {
        templist.sort(function(a,b) {
            return a.time-b.time
        })
    }
    if (property=='alpha') {
        templist.sort(function(a, b){
            if (a.name < b.name) 
                return -1 
            if (a.name > b.name)
                return 1
            return 0
        })
    }
    if (property=='rev') {
        templist.reverse();
    }
    for (i in imagelist) {
        imagelist[i]=templist[i].name;
        imagetime[i]=templist[i].time;
        imagedesc[i]=templist[i].desc;
        if (imagelist[i] == tempcurrent) {
            currentimage=i;
        }
    }
    var markidx=0;
    marklist=[];
    for (i in tempmark) {
        markidx=imagelist.indexOf(tempmark[i]);
        if (markidx!=-1) {
            marklist.push(markidx);
        }
    }
    thumblist(currentimage,currentimage);
    return;
}

function request() {
    // Fetch ?q=search request and present first match.
    var query = location.search.substr(1).split("=");
    if ((query[0]=="q") && query.length>1 && query[1].length>0) {
        for (imname in imagelist) {
            if (imagelist[imname].indexOf(unescape(query[1])) != -1) {
                return parseInt(imname);
                break;
            }
        }
    }
    // Fetch ?p=position request and return the integer
    if ((query[0]=="p") && query.length>1 && query[1].length>0) {
        var retval=parseInt(query[1]);
        if (isNaN(retval)) { return -1; }
        retval=Math.max(1,retval);
        retval=Math.min(retval,imagelist.length);
        return retval-1;
    }

    return -1;
}

function markitem(i) {
    // Adds an item in a list of selected images
    if (imagelist.length==0) { return; }
    if (i==-1) { return; }
    var lel=document.getElementById('listcontainer');
    if (lel.innerHTML.length<4) { 
        lel.innerHTML='<div><div id="markmenu" class="thumbmenu"><span>Marked:</span>'+
                '<span class="menuitem" id="markeditbutton" onclick="marklisteditor();">edit</span>'+
                '<span class="menuitem" id="marktablebutton" onclick="marklisttable();">copy</span>'+
                '</div><div id="marklist"></div></div>';
    }
    var existidx=marklist.indexOf(i);
    if (existidx==-1) {
        marklist.push(i);
    } else {
        marklist.splice(existidx,1);
    }
    marklisteditor();
    showimage(i);
    return;
}

function unmarkitem(i) {
    // remove an item from selection list
    marklist.splice(i,1);
    marklisteditor();
    showimage(currentimage);
    return;
}

function marklisteditor() {
    // print out an editor view of the selection list
    var mel=document.getElementById('marklist');
    var liststr='';
    var dlstr='<a href="data:text/csv,File%0A';
    for (i in marklist) {
        liststr+='<div><span class="menuitem thumbmenu" onclick="unmarkitem('+i+');">X</span>'+
                 '<span class="thumbmenu markedtext" onclick="showimage('+marklist[i]+');">'+imagelist[marklist[i]]+'</span></div>';
        dlstr+=imagelist[marklist[i]]+'%0A';
    }
    dlstr+='">Download as file</a>';
    liststr+='<div class="thumbmenu">'+
                '<span class="menuitem" id="markdeletebutton" onclick="deletemarklist();">delete list</span>'+
                '<span class="menuitem"></span>'+
                '<span class="menuitem" id="markdownloadbutton">'+dlstr+'</span>'+
                '</div>';
    
                
    mel.innerHTML=liststr;
    return;
}

function marklisttable() {
    // print out a copy-pastable text box of the selection list
    var mel=document.getElementById('marklist');
    mel.innerHTML='<form><textarea id="marktable" readonly name="selection">"File"\r\n</textarea></form>';
    var cel=document.getElementById('marktable');
    cel.onclick=marklistselect;
    cel.onblur=marklistblur;
    cel.cols=80;
    cel.hasfocus=false;
    for (i in marklist) {
        cel.value=cel.value+'"'+imagelist[marklist[i]]+'"\r\n';
    }
    var rows=cel.value.split(/\r?\n|\r/).length + 1;
    cel.rows=rows;
    marklistselect();
    return;
}

function deletemarklist() {
    // delete the selection list
    var answer = confirm("Delete your selection list?")
    if (answer) {
        var lel=document.getElementById('listcontainer');
        lel.innerHTML='';
        marklist=[];
        showimage(currentimage);
    }
    return
}

function marklistselect() {
    // set focus to selection list text area
    var cel=document.getElementById('marktable');
    cel.hasfocus=true;
    cel.select();
}

function marklistblur() {
    // set blur to selection list text area
    var cel=document.getElementById('marktable');
    cel.hasfocus=false;
}

function nicestring(s) {
    // Return a nice version of a string
    s=String(s);
    if (s.length<20) {
        return s;
    }
    s=s.replace(/_/g,' ');
    s=s.replace(/-/g,' ');
    if (s.length>30) {
      s=s.substring(0,26)+'..'+s.substring(s.length-4);  
    }
    return s;
}

function titlestring(s) {
    // Return a nice version of a string for title attribute
    s=s.replace(/"/g,"&quot;");
    s=s.replace(/<\/?[^>]+(>|$)/g, "");
    return s;
}

function fliporiginals() {
    // Use original images / medium size jpegs
    if (originals)
        { originals=false; }
    else 
        { originals=true; }
    showimage(currentimage);
}

function getmaxthumbs() {
    return Math.floor((document.body.clientWidth-30)/100)-2;
}

function hidethumbs() {
    // hide all thumbnails
    if (notsupported()) {
        return;
    }
    for (n=0; n<imagelist.length; n++) {
        document.getElementById('n'+n).style.display="none";
    }
    return;
}

function keypressed(e) {
    //if (currentimage==-1) { return; }
    if (document.getElementById('marklist')!=null) {
        if (document.getElementById('marklist').hasfocus) { return; } }
    var evtobj=window.event? event : e; //distinguish between IE's explicit event object (window.event) and Firefox's implicit.
    var unicode=evtobj.charCode? evtobj.charCode : evtobj.keyCode;
    maxThumb=getmaxthumbs();
    var shift=evtobj.shiftKey;
    if (unicode==35 && shift==1) { 
        currentimage=imagelist.length-1; 
        showimage(currentimage);
    }
    if (unicode==36 && shift==1) {
        currentimage=0; 
        showimage(currentimage);
    }
    if (unicode==37 && shift==0) { 
        currentimage-=1;
        if (currentimage<0) { currentimage=imagelist.length-1; }
        showimage(currentimage);
    }
    if (unicode==37 && shift==1) {
        currentimage-=maxThumb;
        if (currentimage<0) { currentimage=imagelist.length-1; }
        showimage(currentimage);
    }
    if (unicode==39 && shift==0) {
        currentimage+=1;
        if (currentimage>(imagelist.length-1)) { currentimage=0; }
        showimage(currentimage);
    }
    if (unicode==39 && shift==1) {
        currentimage+=maxThumb;
        if (currentimage>(imagelist.length-1)) { currentimage=0; }
        showimage(currentimage);
    }
    if (unicode==88) {
        markitem(currentimage);   
    }        
    //Debug:
    //alert(unicode);
    
    return;
}

function notsupported() {
    // not supported devices (i.e. the javascript doesnt work properly )
    if (uagent.search('series60')>-1) {
        return true;
    }
    if (uagent.search('opera mobi')>-1) {
        return true;
    }
    return false;
}