/**
 * Volume widget presentation code
 * 
 * Greyhound - real web management for Amarok
 * Copyright (C) 2008 Dan Fuhry
 *
 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 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 General Public License for details.
 */

var current_volume = 0;

function set_volume_fill(amount)
{
  amount = 10 * ( Math.round(amount / 10) );
  if ( amount == 0 )
    amount = -10;
  for ( var i = 0; i <= amount; i += 10 )
  {
    if ( !$('volbtn_' + i).hasClass('volume_button_active') )
    {
      $('volbtn_' + i).addClass('volume_button_active');
    }
  }
  for ( ; i <= 100; i += 10 )
  {
    if ( $('volbtn_' + i).hasClass('volume_button_active') )
    {
      $('volbtn_' + i).rmClass('volume_button_active');
    }
  }
}

function volume_over(amount)
{
  set_volume_fill(amount);
}

function volume_out()
{
  set_volume_fill(current_volume);
}

function set_volume(level)
{
  setAjaxLoading();
  if ( level == current_volume )
    return false;
  ajaxGet('/action.json/volume/' + level, function()
    {
      if ( ajax.readyState == 4 && ajax.status == 200 )
      {
        unsetAjaxLoading();
        var response = (' ' + ajax.responseText).substr(1);
        // quickie JSON parser :)
        response = eval('(' + response + ')');
        // update volume
        if ( response.volume != current_volume )
        {
          set_volume_fill(response.volume);
          current_volume = response.volume;
        }
      }
    });
}

function volume_custom_form()
{
  if ( $('volumebox').object )
  {
    return false;
  }
  var box = document.createElement('div');
  $(box)
    .css('position', 'absolute')
    .css('padding', '50px 80px')
    .css('background-image', 'url(/trans80.png)')
    .css('color', 'black')
    .css('text-align', 'center')
    .attr('id', 'volumebox')
    .insertText('volume:')
    .insertBR().insertBR()
    .opacity(0);
  document.body.appendChild(box);
  
  var field = document.createElement('input');
  $(field)
    .attr('type', 'text')
    .attr('value', '')
    .attr('size', '7')
    .css('text-align', 'center');
  box.appendChild(field);
  
  $(box)
    .css('top',  (( getHeight() / 2 ) - ( $(box).Height() / 2 ) + getScrollOffset()) + 'px')
    .css('left', (( $(document.body).Width() / 2 ) - ( $(box).Width() / 2 )) + 'px');
  
  $(box).fadeIn(250);
  field.focus();
  field.onkeyup = function(e)
  {
    if ( e.keyCode == 13 || e.keyCode == 27 )
    {
      if ( this.value == '' || e.keyCode == 27 )
      {
        $(this.parentNode).fadeOut(250, function(o)
          {
            o.parentNode.removeChild(o);
          });
      }
      else if ( !this.value.match(/^[0-9]+$/) )
      {
        $(this.parentNode).insertBR().insertText('please enter a number');
      }
      else
      {
        set_volume(parseInt(this.value));
        $(this.parentNode).fadeOut(250, function(o)
          {
            o.parentNode.removeChild(o);
          });
      }
    }
  }
}

addOnloadHook(function()
  {
    window.onkeyup = function(e)
    {
      if ( e.keyCode == 86 )
      {
        volume_custom_form();
      }
    }
  });

function getHeight() {
  var myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    myHeight = window.innerHeight;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    myHeight = document.body.clientHeight;
  }
  return myHeight;
}

function getWidth() {
  var myWidth = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    myWidth = window.innerWidth;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientWidth ) ) {
    myWidth = document.documentElement.clientWidth;
  } else if( document.body && ( document.body.clientWidth || document.body.clientWidth ) ) {
    myWidth = document.body.clientWidth;
  }
  return myWidth;
}

function getScrollOffset(el)
{
  var position;
  var s = el || self;
  el = el || document;
  if ( el.scrollTop )
  {
    position = el.scrollTop;
  }
  else if (s.pageYOffset)
  {
    position = self.pageYOffset;
  }
  else if (document.documentElement && document.documentElement.scrollTop)
  {
    position = document.documentElement.scrollTop;
  }
  else if (document.body)
  {
    position = document.body.scrollTop;
  }
  return position;
}