/*
**  InkWeb - Inkscape's Javscript features for the open vector web
**
**  Copyright (C) 2009 Aurelio A. Heckert, aurium (a) gmail dot com
**
**  ********* Bugs and New Fetures *************************************
**   If you found any bug on this script or if you want to propose a
**   new feature, please report it in the inkscape bug traker
**   https://bugs.launchpad.net/inkscape/+filebug
**   and assign that to Aurium.
**  ********************************************************************
**
**  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 InkWeb = {

  version: 0.04,

  NS: {
    svg:      "http://www.w3.org/2000/svg",
    sodipodi: "http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd",
    inkscape: "http://www.inkscape.org/namespaces/inkscape",
    cc:       "http://creativecommons.org/ns#",
    dc:       "http://purl.org/dc/elements/1.1/",
    rdf:      "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    xlink:    "http://www.w3.org/1999/xlink",
    xml:      "http://www.w3.org/XML/1998/namespace"
  }

};

InkWeb.el = function (tag, attributes) {
  // A helper to create SVG elements
  var element = document.createElementNS( this.NS.svg, tag );
  for ( var att in attributes ) {
    switch ( att ) {
      case "parent":
        attributes.parent.appendChild( element );
        break;
      case "text":
        element.appendChild( document.createTextNode( attributes.text ) );
        break;
      default:
        element.setAttribute( att, attributes[att] );
    }
  }
  return element;
}

InkWeb.reGetStyleAttVal = function (att) {
  return new RegExp( "(^|.*;)[ ]*"+ att +":([^;]*)(;.*|$)" )
}

InkWeb.getStyle = function (el, att) {
  // This method is needed because el.style is only working
  // to HTML style in the Firefox 3.0
  if ( typeof(el) == "string" )
    el = document.getElementById(el);
  var style = el.getAttribute("style");
  var match = this.reGetStyleAttVal(att).exec(style);
  if ( match ) {
    return match[2];
  } else {
    return false;
  }
}

InkWeb.setStyle = function (el, att, val) {
  if ( typeof(el) == "string" )
    el = document.getElementById(el);
  var style = el.getAttribute("style");
  re = this.reGetStyleAttVal(att);
  if ( re.test(style) ) {
    style = style.replace( re, "$1"+ att +":"+ val +"$3" );
  } else {
    style += ";"+ att +":"+ val;
  }
  el.setAttribute( "style", style );
  return val
}

InkWeb.transmitAtt = function (conf) {
  conf.att = conf.att.split( /\s+/ );
  if ( typeof(conf.from) == "string" )
    conf.from = document.getElementById( conf.from );
  if ( ! conf.to.join )
    conf.to = [ conf.to ];
  for ( var toEl,elN=0; toEl=conf.to[elN]; elN++ ) {
    if ( typeof(toEl) == "string" )
      toEl = document.getElementById( toEl );
    for ( var i=0; i<conf.att.length; i++ ) {
      var val = this.getStyle( conf.from, conf.att[i] );
      if ( val ) {
        this.setStyle( toEl, conf.att[i], val );
      } else {
        val = conf.from.getAttribute(conf.att[i]);
        toEl.setAttribute( conf.att[i], val );
      }
    }
  }
}

InkWeb.setAtt = function (conf) {
  if ( ! conf.el.join )
    conf.to = [ conf.el ];
  conf.att = conf.att.split( /\s+/ );
  conf.val = conf.val.split( /\s+/ );
  for ( var el,elN=0; el=conf.el[elN]; elN++ ) {
    if ( typeof(el) == "string" )
      el = document.getElementById( el );
    for ( var att,i=0; att=conf.att[i]; i++ ) {
      if (
           att == "width"  ||
           att == "height" ||
           att == "x"  ||
           att == "y"  ||
           att == "cx" ||
           att == "cy" ||
           att == "r"  ||
           att == "rx" ||
           att == "ry" ||
           att == "transform"
         ) {
        el.setAttribute( att, conf.val[i] );
      } else {
        this.setStyle( el, att, conf.val[i] );
      }
    }
  }
}

InkWeb.moveElTo = function (startConf) {
  if ( typeof(startConf) == "string" ) {
    // startConf may be only a element Id, to timeout recursive calls.
    var el = document.getElementById( startConf );
  } else {
    if ( typeof(startConf.el) == "string" )
      startConf.el = document.getElementById( startConf.el );
    var el = startConf.el;
  }
  if ( ! el.inkWebMoving ) {
    el.inkWebMoving = {
      step: 0
    };
  }
  var conf = el.inkWebMoving;
  if ( conf.step == 0 ) {
    conf.x = startConf.x;
    conf.y = startConf.y;
    // dur : duration of the animation in seconds
    if ( startConf.dur ) { conf.dur = startConf.dur }
    else { conf.dur = 1 }
    // steps : animation steps in a second
    if ( startConf.stepsBySec ) { conf.stepsBySec = startConf.stepsBySec }
    else { conf.stepsBySec = 16 }
    conf.sleep = Math.round( 1000 / conf.stepsBySec );
    conf.steps = conf.dur * conf.stepsBySec;
    var startPos = el.getBBox();
    conf.xInc = ( conf.x - startPos.x ) / conf.steps;
    conf.yInc = ( conf.y - startPos.y ) / conf.steps;
    conf.transform = el.transform.baseVal.consolidate();
    if ( ! conf.transform ) {
      conf.transform = el.ownerSVGElement.createSVGTransform();
    }
    el.transform.baseVal.clear();
    el.transform.baseVal.appendItem(conf.transform);
  }
  if ( conf.step < conf.steps ) {
    conf.step++;
    conf.transform.matrix.e += conf.xInc;
    conf.transform.matrix.f += conf.yInc;
    try{ el.ownerSVGElement.forceRedraw() }
    catch(e){ this.log(e, "this "+el.ownerSVGElement+" has no forceRedraw().") }
    conf.timeout = setTimeout( 'InkWeb.moveElTo("'+el.id+'")', conf.sleep );
  } else {
    delete el.inkWebMoving;
  }
}

InkWeb.log = function () { /* if you need that, use the inkweb-debug.js too */ }