//
// pprompt.js - simple window library.
//
// Copyright (C) 2005 Masaki Komagata <komagata@gmail.com> 
//     All rights reserved.
//     This is free software with ABSOLUTELY NO WARRANTY.
//
// You can redistribute it and/or modify it under the terms of 
// the GNU General Public License version 2.
//
PPrompt = function() {}

PPrompt.alert = function(msg, options) {
  var pprompt = new PPrompt;
  pprompt.alert(msg, options);
  return pprompt;
}

PPrompt.confirm = function(msg, options) {
  var pprompt = new PPrompt;
  pprompt.confirm(msg, options);
  return pprompt;
}

PPrompt.prompt = function(msg, options) {
  var pprompt = new PPrompt;
  pprompt.prompt(msg, options);
  return pprompt;
}

PPrompt.close = function(msg, options) {
  var pprompt = new PPrompt;
  pprompt.close();
  return pprompt;
}

PPrompt.prototype.alert = function(msg, options) {
  var options = this.extend(this.options(), options || {});
  this.addOverlay();

  var pwindow = this.getWindow(options.height, options.width);

  // msg
  var pmsg = document.createElement('div');
  pmsg.className = 'pmsg';
  pmsg.style.padding = '6px';
  pmsg.appendChild(document.createTextNode(msg));

  pwindow.appendChild(pmsg);

  // buttons
  var pbuttons = document.createElement('div');
  pbuttons.id = 'pbuttons';
  pbuttons.style.padding = '6px';

  // ok
  var pbuttonOk = document.createElement('button');
  pbuttonOk.className = 'pbutton';
  pbuttonOk.appendChild(document.createTextNode(options.labelOk));
  pbuttonOk.onclick = options.onOk;
  pbuttons.appendChild(pbuttonOk);

  pwindow.appendChild(pbuttons);
  document.body.appendChild(pwindow);
  pbuttonOk.focus();
};

PPrompt.prototype.confirm = function(msg, options) {
  var options = this.extend(this.options(), options || {});
  this.addOverlay();

  var pwindow = this.getWindow(options.height, options.width);

  // msg
  var pmsg = document.createElement('div');
  pmsg.className = 'pmsg';
  pmsg.style.padding = '6px';
  pmsg.appendChild(document.createTextNode(msg));
  pwindow.appendChild(pmsg);

  // buttons
  var pbuttons = document.createElement('div');
  pbuttons.id = 'pbuttons';
  pbuttons.style.padding = '6px';

  // ok
  var pbuttonOk = document.createElement('button');
  pbuttonOk.className = 'pbutton';
  pbuttonOk.appendChild(document.createTextNode(options.labelOk));
  pbuttonOk.onclick = options.onOk;
  pbuttons.appendChild(pbuttonOk);

  // cancel
  var pbuttonCancel = document.createElement('button');
  pbuttonCancel.className = 'pbutton';
  pbuttonCancel.appendChild(document.createTextNode(options.labelCancel));
  pbuttonCancel.onclick = options.onCancel;
  pbuttons.appendChild(pbuttonCancel);

  pwindow.appendChild(pbuttons);
  document.body.appendChild(pwindow);
  pbuttonOk.focus();
};

PPrompt.prototype.prompt = function(msg, options) {
  var opt = this.options();
  opt.height = 100;
  var options = this.extend(opt, options || {});

  this.addOverlay();

  var pwindow = this.getWindow(options.height, options.width);

  // msg
  var pmsg = document.createElement('div');
  pmsg.className = 'pmsg';
  pmsg.style.padding = '6px';
  pmsg.appendChild(document.createTextNode(msg));
  pwindow.appendChild(pmsg);

  // buttons
  var pbuttons = document.createElement('div');
  pbuttons.id = 'pbuttons';
  pbuttons.style.padding = '6px';

  // input
  var pinput = document.createElement('input');
  pinput.id = 'pinput';
  pinput.style.width = '260px';
  pinput.setAttribute('type', 'text');
  pwindow.appendChild(pinput);

  // ok
  var pbuttonOk = document.createElement('button');
  pbuttonOk.className = 'pbutton';
  pbuttonOk.appendChild(document.createTextNode(options.labelOk));
  pbuttonOk.onclick = function() {
      options.onOk(pinput.value);
  };
  pbuttons.appendChild(pbuttonOk);

  // cancel
  var pbuttonCancel = document.createElement('button');
  pbuttonCancel.className = 'pbutton';
  pbuttonCancel.appendChild(document.createTextNode(options.labelCancel));
  pbuttonCancel.onclick = options.onCancel;
  pbuttons.appendChild(pbuttonCancel);

  pwindow.appendChild(pbuttons);
  document.body.appendChild(pwindow);
  pinput.focus();
};

PPrompt.prototype.addOverlay = function() {
  var poverlay = document.createElement('div');
  poverlay.id = 'poverlay';
  with(poverlay.style) {
    top = '0px';
    left = '0px';
    position = 'absolute';
    background = '#000';
  }

  this.setOpacity(poverlay, 0.5);
  var pageSize = this.getPageSize();
  poverlay.style.height = pageSize.pageHeight+'px';
  poverlay.style.width = '100%';
  document.body.appendChild(poverlay);
};

PPrompt.prototype.removeOverlay = function() {
  document.body.removeChild(document.getElementById('poverlay'));
};

PPrompt.prototype.getWindow = function(height, width) {
  document.body.style.padding = '0';
  var pwindow = document.createElement('div');
  pwindow.id = 'pwindow';
  var pageSize = this.getPageSize();
  var pos = this.realOffset(document.body);
  pwindow.style.top = (pageSize.windowHeight/2 - height/2 + pos[1])+'px';
  pwindow.style.left = (pageSize.windowWidth/2 - width/2 + pos[0])+'px';
  pwindow.style.height = height+'px';
  pwindow.style.width = width+'px';
  pwindow.style.position = 'absolute';
  pwindow.style.background = '#fff';
  pwindow.style.border = '6px solid #ccc';
  pwindow.style.padding = '6px';
  pwindow.style.textAlign = 'center';
  return pwindow;
};

PPrompt.prototype.close = function() {
  this.removeOverlay();
  document.body.removeChild(document.getElementById('pwindow'));
};

PPrompt.prototype.options = function() {
  return {
    'height'      : 70,
    'width'       : 300,
    'labelOk'     : 'OK',
    'labelCancel' : 'Cancel',
    'onOk'        : function() {
      PPrompt.close();
    },
    'onCancel'    : function() {
      PPrompt.close();
    }
  };
};

PPrompt.prototype.extend = function(destination, source) {
  for (var property in source) {
    destination[property] = source[property];
  }
  return destination;
};

PPrompt.prototype.realOffset = function(element) {
  var valueT = 0, valueL = 0;
  do {
    valueT += element.scrollTop  || 0;
    valueL += element.scrollLeft || 0;
    element = element.parentNode;
  } while (element);
  return [valueL, valueT];
};

PPrompt.prototype.setOpacity = function(element, value){
  if (typeof element == 'string')
    element= $(element);
  if (value == 1){
    element.style.opacity = (/Gecko/.test(navigator.userAgent) && !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0 ;
    if(/MSIE/.test(navigator.userAgent) && !window.opera)
      element.style.filter = element.style.filter.replace(/alpha\([^\)]*\)/gi,'');
  } else {
    if(value < 0.00001) value = 0;
    element.style.opacity = value;
    if(/MSIE/.test(navigator.userAgent) && !window.opera)
      element.style.filter = element.style.filter.replace(/alpha\([^\)]*\)/gi,'') + 'alpha(opacity='+value*100+')';
  }
  return element;
};

PPrompt.prototype.getPageSize = function() {
  var xScroll, yScroll;
  if (window.innerHeight && window.scrollMaxY) {
    xScroll = document.body.scrollWidth;
    yScroll = window.innerHeight + window.scrollMaxY;
  } else if (document.body.scrollHeight > document.body.offsetHeight){
    // all but Explorer Mac
    xScroll = document.body.scrollWidth;
    yScroll = document.body.scrollHeight;
  } else {
    // Explorer Mac...would also work in Explorer 6 Strict,
    // Mozilla and Safari
    xScroll = document.body.offsetWidth;
    yScroll = document.body.offsetHeight;
  }

  var windowWidth, windowHeight;
  if (self.innerHeight) {      // all except Explorer
    windowWidth = self.innerWidth;
    windowHeight = self.innerHeight;
  } else if (document.documentElement
  && document.documentElement.clientHeight) {
    // Explorer 6 Strict Mode
    windowWidth = document.documentElement.clientWidth;
    windowHeight = document.documentElement.clientHeight;
  } else if (document.body) { // other Explorers
    windowWidth = document.body.clientWidth;
    windowHeight = document.body.clientHeight;
  }

  // for small pages with total height less then height of the viewport
  if(yScroll < windowHeight){
    pageHeight = windowHeight;
  } else {
    pageHeight = yScroll;
  }

  // for small pages with total width less then width of the viewport
  if(xScroll < windowWidth){
    pageWidth = windowWidth;
  } else {
    pageWidth = xScroll;
  }

  return {
    'pageWidth':pageWidth,
    'pageHeight':pageHeight,
    'windowWidth':windowWidth,
    'windowHeight':windowHeight,
    'yScroll':yScroll,
    'xScroll':xScroll
  };
};