"use strict";
FW_version["svg.js"] = "$Id$";

var svgCallback={};
if(!svgNS) {
  var svgNS = "http://www.w3.org/2000/svg";
  var svg_initialized={}, lastHidden;
  var svg_db, svg_dbtbl = "SVG_KEYVALUE", svg_pastedata, svgCounter=0;
}

function
svg_initDb(nextFn)
{
  if(window.indexedDB == undefined)
    return;
  var dbreq = indexedDB.open("FHEM", 1);
  dbreq.onsuccess = function(op) { svg_db = op.target.result; nextFn() }
  dbreq.onerror   = function(op) {
    var oldfn = window.onerror;
    window.onerror = undefined; // stupid FireFox private mode (Forum #64541)
    log("indexedDB.open Error: " + op.message);
    setTimeout(function(){window.onerror = oldfn;}, 100);
  }
  dbreq.onupgradeneeded = function(op) {
    svg_db = op.target.result;
    svg_db.createObjectStore(svg_dbtbl, { keyPath:"key" });
  };
}

function
svg_save(key, value)
{
  if(!svg_db)
    return;
  var os = svg_db.transaction([svg_dbtbl],"readwrite")
                 .objectStore(svg_dbtbl);
  os.put({key:key, val:value});
}

function
svg_load(key, nextFn)
{
  if(!svg_db)
    return;
  var req = svg_db.transaction([svg_dbtbl],"readonly")
                 .objectStore(svg_dbtbl)
                 .get(key);
  req.onsuccess = function(e) { if(req.result) nextFn(req.result.val); }
}


function
svg_prepareHash(el)
{
  var obj = { y_mul:0,y_h:0,y_min:0, decimals:0,
              t_mul:0,x_off:0,x_min:0, x_mul:0, scale:"" };
  for(var name in obj) {
    var n = $(el).attr(name);
    if(name == "scale" && n)
      obj[name] = n;
    else if(n)
      obj[name] = parseFloat(n);
  }
  return obj;
}

// Called directly from the SVG.pm generated SVG.
function
svg_click(evt)
{
  var t = evt.target;
  var o = svg_prepareHash(t);

  var svg=$(t).closest("svg"), x=evt.clientX, y=evt.clientY;
  if($(svg).parent().length) { // isEmbed=0
    var off = $(svg).offset();
    x -= off.left;
    y -= off.top;
  }

  var y_org = (((o.y_h-y)/o.y_mul)+o.y_min);
  if(o.scale == "log")
    y_org = Math.pow(10,y_org);
  else
    y_org = y_org.toFixed(o.decimals);

  var d = new Date((((x-o.x_min)/o.t_mul)+o.x_off) * 1000);
  var ts = (d.getHours() < 10 ? '0' : '') + d.getHours() + ":"+
           (d.getMinutes() < 10 ? '0' : '') + d.getMinutes();

  var tl = $(t).closest("svg").find("#svg_title");
  $(tl).html($(t).attr("title")+": "+y_org+" ("+ts+")");
}

function
sv_menu(evt, embed)
{
  var label = evt.target;
  var svg = $(label).closest("svg");
  var svgNode = $(svg).get(0);
  var lid = $(label).attr("line_id");
  var sel = $(svg).find("#"+lid);
  var selNode = $(sel).get(0);

  // horizintalLine* consists of a list of lines, too much work do handle
  // it.
  if(!selNode)
    return;

  var tl = $(svg).find("#svg_title");
  var par = svgNode.par;

  var lines = $(svg).find("[line_id]");
  var hidden = $(svg).find(".hidden");

  function
  myPathSegList(node)     // chrome 48+ removed the pathSegList interface
  {
    this.arr = $(node).attr("d").split(/  */);
    this.arr.splice(0,1); // remove M
    this.arr.splice(1,1); // remove L/Q/etc
    this.numberOfItems = this.arr.length;
    this.getItem = function(pos)
    {
      var xy = this.arr[pos].split(",");
      return { x:parseFloat(xy[0]), y:parseFloat(xy[1]) };
    }
  }
  
  var embedOffsetY = 0;
  if(embed) {
    var name = $(evt.target).parent("svg").attr("id").substr(8);
    embedOffsetY = $("div.SVGplot.SVG_"+name).offset().top;
  }

  function
  showValOff() {
    $(svg).find("[id]").each(function(){delete($(this).get(0).showVal)});
    $(svg).off("mousemove");
    $(svg).off("mousedown");

    if(par && par.circle) {
      $(par.circle).remove();
      $(par.div).remove();
    }
  }

  var sn = selNode.nodeName,
      pn = (sn=="path" ? "d" : "points"),
      arrName = (sn=="path" ? "pathSegList" : "points");
  var textArr =
    ["Copy", "Paste",
      selNode.isHidden ? "Show line" : "Hide line",
      "Hide other lines",
      "Show all lines",
      selNode.showVal ? "Stop displaying values" : "Display plot values" ];
   if(!selNode.showVal &&
      $(selNode).attr("title").indexOf("/hr")> 0) // e.g. l/hr
     textArr.push("Integrate");

  FW_menu(evt, label, textArr,
    [undefined, svg_pastedata == undefined,
      !selNode.isHidden && (lines.length - hidden.length) == 1,
      !selNode.isHidden && (lines.length - hidden.length) == 1,
      hidden.length==0,
      selNode.isHidden || (sn!="polyline" && sn!="path"),
      selNode.isHidden || (sn!="polyline" && sn!="path") ],
    function(arg) {

      //////////////////////////////////// copy
      if(arg == 0) {
        svg_pastedata = {
          key:"svg_pastedata",
          tag:sn, attr:pn,
          y_min:$(sel).attr("y_min"),
          y_mul:$(sel).attr("y_mul"),
          datapoints:$(sel).attr(pn)
        };
        svg_save("svg_pastedata", svg_pastedata);
      }

      //////////////////////////////////// paste
      if(arg == 1) {
        var doc = $(svg).get(0).ownerDocument;
        var o=doc.createElementNS(svgNS, svg_pastedata.tag);
        o.setAttribute("class", "SVGplot pasted");
        o.setAttribute(svg_pastedata.attr, svg_pastedata.datapoints);

        var h  = parseFloat($(sel).attr("y_h"));
        var ny_mul = parseFloat(svg_pastedata.y_mul);
        var ny_min = parseInt(svg_pastedata.y_min);
        var y_mul  = parseFloat($(sel).attr("y_mul"));
        var y_min  = parseInt($(sel).attr("y_min"));
        var tr = 
            "translate(0,"+ (h/y_mul+y_min-h/ny_mul-ny_min)*y_mul +") "+
            "scale(1, "+ (y_mul/ny_mul) +") ";
        o.setAttribute("transform", tr);
        svgNode.appendChild(o);
      }

      //show/hide
      if(arg == 2) {
        setVisibility(lid, selNode.isHidden?1:0);
        $(label).attr("opacity", selNode.isHidden?0.4:1);
      }

      //hide other
      if(arg == 3) {
        $(svg).find("[id]").each(function(){
          var id = $(this).attr("id");
          if(id.indexOf("line_") != 0 )
            return;
          var label = $(svg).find('[line_id="'+id+'"]');
          if( !label.length ) // ignore lines with label none
            return;
          var sel = $(svg).find("#"+id);
          var selNode = $(sel).get(0);
          if( (selNode.isHidden?false:true) != (id == lid) )
            setVisibility(id, id == lid);
          label.attr("opacity", id == lid?1:0.4);
        } );
      }

      //show all
      if(arg == 4) {
        $(svg).find("[line_id]").attr("opacity",1);
        $(svg).find("[id]").each(function(){
          var id = $(this).attr("id");
          if(id.indexOf("line_") != 0 )
            return;
          var sel = $(svg).find("#"+id);
          var selNode = $(sel).get(0);
          if( !selNode.isHidden )
            return;
          setVisibility(id, 1);
          //$(svg).find('[line_id="'+id+'"]').attr("opacity",1);
        } );
      }

      //////////////////////////////////
      if(arg == 5 ||   // value display
         arg == 6) {   // Integrate. Only for "per hour", title must contain /hr

        selNode.isInt = (arg == 6 ? true : false);
        var hadShowVal = selNode.showVal;
        showValOff();

        if(!hadShowVal) {
          selNode.showVal = true;
          $(svg).mousemove(mousemove);
          if(arg == 6) {
            selNode.clicked = false;
            $(svg).mousedown(function(e) {
              selNode.clicked = !selNode.clicked; 
              selNode.clickedOffset = 0;
              mousemove(e)
            });
          }
          svgNode.par = par = svg_prepareHash(selNode);

          par.circle =
                $(svg).get(0).ownerDocument.createElementNS(svgNS, "circle");
          $(par.circle).attr("id", "svgmarker").attr("r", "8");
          $(svg).append(par.circle);

          par.div = $('<div id="svgmarker">');
          var parent = (embed ? $(embed).parent() : $(svg).parent()); 
          $(parent).append(par.div);

          var pl = selNode[arrName];
          if(!pl)
            selNode[arrName] = pl = new myPathSegList(selNode);
          if(pl.numberOfItems > 2)
            mousemove({pageX:pl.getItem(pl.numberOfItems-2).x});
        }
      }


      if( arg >= 2 && arg <= 4 ) {
        var hidden = $(svg).find(".hidden");
        if( lines.length - hidden.length == 1 ) {
            $(tl).attr("hiddentitle", $(tl).text());
            if($(sel).attr(pn) != null)
              $(tl).text($(label).attr("title"));

        } else if( $(tl).attr("hiddentitle") ) {
            $(tl).text($(tl).attr("hiddentitle"));
            $(tl).removeAttr("hiddentitle")

        }
      }

    }, embed);

  function pad0(v) { return (v < 10 ? '0'+v  :v); }

  function
  mousemove(e)
  {
    var xRaw = e.pageX, pl = selNode[arrName], l = pl.numberOfItems, i1;
    if(!embed)
      xRaw -= $(svg).offset().left;
    for(i1=0; i1<l; i1++)
      if(pl.getItem(i1).x > xRaw)
        break;
    if(i1==l || i1==0)
      return;

    var pp=pl.getItem(i1-1), pn=pl.getItem(i1);
    var xR = (xRaw-pp.x)/(pn.x-pp.x);   // Compute interim values
    var yRaw = pp.y+xR*(pn.y-pp.y); 

    var y = (((par.y_h-yRaw)/par.y_mul)+par.y_min);

    if(par.scale == "log")
      y = Math.pow(10,y);
    else
      y = y.toFixed(par.decimals);

    if(selNode.isInt) {
      if(selNode.clicked) {
        if(!selNode.clickedOffset)
          selNode.clickedOffset = i1-1;
        var sum = 0;
        var pn = pl.getItem(selNode.clickedOffset);
        var oy = ((par.y_h-pn.y)/par.y_mul)+par.y_min;
        var ox = (pn.x-par.x_min)/par.t_mul;
        for(var i2=selNode.clickedOffset+1; i2<i1; i2++) {
          pn = pl.getItem(i2);
          var ny = ((par.y_h-pn.y)/par.y_mul)+par.y_min;
          var nx = (pn.x-par.x_min)/par.t_mul;
          sum += (ny+oy)/2 * (nx-ox)/3600;
          oy = ny; ox = nx;
        }
        y = "Sum:"+sum.toFixed(par.decimals);
      } else {
        y = 'Click to start';
      }
    }

    var ts;
    if( par.x_mul ) {
      ts = (((xRaw-par.x_min)/par.x_mul)+par.x_off).toFixed(par.decimals);

    } else {
      var d = new Date((((xRaw-par.x_min)/par.t_mul)+par.x_off) * 1000);
      if(par.t_mul < 0.0001) {           // Year
        ts =(pad0(d.getMonth()+1))+"."+pad0(d.getDate()+"."+(d.getYear()+1900));
      } else if(par.t_mul < 0.001) {     // Month
        ts = (pad0(d.getMonth()+1))+"."+pad0(d.getDate())+
                ". "+pad0(d.getHours())+":"+pad0(d.getMinutes());
      } else {
        ts = pad0(d.getHours())+":"+pad0(d.getMinutes());
      }
    }

    $(par.circle).attr("cx", xRaw).attr("cy", yRaw);
    var yd = Math.floor(yRaw / 20)*20 - 50;

    $(par.div).html(ts+" "+y)
              .css({ left:xRaw-20, top:yd });
  }

  function
  setVisibility(id,visible)
  {
    var sel = $(svg).find("#"+id);
    var selNode = $(sel).get(0);
    var currval = visible?1:0;
    var h = parseFloat(sel.attr("y_h"));
    //sel.attr("transform", "translate(0,"+h*(1-currval)+") "
    //+ "scale(1,"+currval+")");

    if( !visible
        && selNode.showVal )
      showValOff();

    animateVisibility(sel,visible?0:1, visible?1:0);

    if( visible ) {
      delete(selNode.isHidden);
      sel.attr("class", sel.attr("class").replace(/ hidden/, "" ) );
    } else {
      selNode.isHidden = true;
      sel.attr("class", sel.attr("class") + " hidden" );
    }
  }

  function
  animateVisibility(sel, currval, maxval)
  {
    var h = parseFloat(sel.attr("y_h"));
    sel.attr("transform", "translate(0,"+h*(1-currval)+") "+
                                "scale(1,"+currval+")");

    if(currval != maxval) {
      currval += (currval<maxval ? 0.02 : -0.02);
      currval = Math.round(currval*100)/100;
      setTimeout(function(){ animateVisibility(sel,currval,maxval) }, 10);
    }
  }

}

function
svg_init_one(embed, svg)
{
  var sid = $(svg).attr("id");
  if(svg_initialized[sid])
    return;
  svg_initialized[sid] = true;
  $("text.legend", svg).click(function(e){sv_menu(e, embed)});
  for(var i in svgCallback) {
    if(!svg.getAttribute) svg.getAttribute = function(){ return true }; // fix for flex.js crash
    svgCallback[i](svg);
  }
}

function
svg_init(par)    // also called directly from perl, in race condition
{
  $("embed").each(function(){
    var e = this;
    var src = $(e).attr("src");
    var ed = FW_getSVG(e);
    if(!src || src.indexOf("SVG_showLog") < 0 || !ed)
      return;
    var sTag = $("svg", ed)[0]; // "not well-formed" warning in FireFox
    if((par && $(sTag).attr("id") != par))
      return;
    svg_init_one(e, sTag);
  });

  if(par)
    return;

  $("svg.plotembed_2[data-src]").each(function(){
    var svgThis = this;
    var src = $(this).attr("data-src");
    var dev = FW_escapeSelector($(this).attr("data-dev"));
    FW_cmd(src, function(data){
      $(svgThis).replaceWith(data.substr(data.indexOf('<svg')));
      svg_init_one(undefined, $("svg#SVGPLOT_"+dev));
   });
  });
}

$(document).ready(function(){
  if(svgCounter++ > 0)  // if svg.js is included twice, e.g. by Dashboard
    return;
  svg_init();                          // <embed><svg>
  svg_initDb(function(){
    svg_load("svg_pastedata", function(val) {svg_pastedata = val} );
  });
  $("svg[id]").each(function(){        // <svg> (direct)
    if($(this).parent().parent('td').length)    // needed in groups
      $(this).parent().css( "position", "relative" );
    if($(this).attr("id").indexOf("SVGPLOT") == 0)
      svg_init_one(undefined, this);
  });
});

// longpollSVG code below
function
FW_svgUpdateDevs(devs)
{
  // if matches, refresh the SVG by removing and readding the embed tag
  var embArr = document.getElementsByTagName("embed");
  for(var i = 0; i < embArr.length; i++) {
    var svg = FW_getSVG(embArr[i]);
    if(!svg || !svg.firstChild || !svg.firstChild.nextSibling)
      continue;
    if(svg.contentType != "image/svg+xml" &&
       typeof embArr[i].getSVGDocument != "function")
      continue;
    svg = svg.firstChild.nextSibling;
    var flog = svg.getAttribute("flog");
    if(!flog)
      continue;
    flog = flog.replace(/\\x3a/g, ".");
    log("longpollSVG filter:"+flog);
    for(var j=0; j < devs.length; j++) {
      var d = devs[j];
      var ev = d[0]+":"+d[1];
      if(ev.match(flog)) {
        log("longpollSVG: reload SVG");
        delete(svg_initialized[$(svg).attr("id")]);
        var e = embArr[i];
        var newE = document.createElement("embed");
        for(var k=0; k<e.attributes.length; k++)
          newE.setAttribute(e.attributes[k].name, e.attributes[k].value);
        e.parentNode.insertBefore(newE, e);
        e.parentNode.removeChild(e);
        break;
      }
    }
  }
}

FW_widgets.SVG = { updateDevs:FW_svgUpdateDevs };