// JQuery Console 1.0
// Sun Feb 21 20:28:47 GMT 2010
//
// Copyright 2010 Chris Done, Simon David Pratt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//    1. Redistributions of source code must retain the above
//       copyright notice, this list of conditions and the following
//       disclaimer.
//
//    2. Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials
//       provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

// TESTED ON
//   Internet Explorer 6
//   Opera 10.01
//   Chromium 4.0.237.0 (Ubuntu build 31094)
//   Firefox 3.5.8, 3.6.2 (Mac)
//   Safari 4.0.5 (6531.22.7) (Mac)
//   Google Chrome 5.0.375.55 (Mac)

(function($){
  var isWebkit = !!~navigator.userAgent.indexOf(' AppleWebKit/');

  $.fn.console = function(config){
    ////////////////////////////////////////////////////////////////////////
    // Constants
    // Some are enums, data types, others just for optimisation
    var keyCodes = {
      // left
      37: moveBackward,
      // right
      39: moveForward,
      // up
      38: previousHistory,
      // down
      40: nextHistory,
      // backspace
      8:  backDelete,
      // delete
      46: forwardDelete,
      // end
      35: moveToEnd,
      // start
      36: moveToStart,
      // return
      13: commandTrigger,
      // tab
      18: doNothing,
      // tab
      9: doComplete
    };
    var ctrlCodes = {
      // C-a
      65: moveToStart,
      // C-e
      69: moveToEnd,
      // C-d
      68: forwardDelete,
      // C-n
      78: nextHistory,
      // C-p
      80: previousHistory,
      // C-b
      66: moveBackward,
      // C-f
      70: moveForward,
      // C-k
      75: deleteUntilEnd
    };
    if(config.ctrlCodes) {
      $.extend(ctrlCodes, config.ctrlCodes);
    }
    var altCodes = {
      // M-f
      70: moveToNextWord,
      // M-b
      66: moveToPreviousWord,
      // M-d
      68: deleteNextWord
    };
    var shiftCodes = {
      // return
      13: newLine,
    };
    var cursor = '<span class="jquery-console-cursor">&nbsp;</span>';

    ////////////////////////////////////////////////////////////////////////
    // Globals
    var container = $(this);
    var inner = $('<div class="jquery-console-inner"></div>');
    // erjiang: changed this from a text input to a textarea so we
    // can get pasted newlines
    var typer = $('<textarea autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" class="jquery-console-typer"></textarea>');
    // Prompt
    var promptBox;
    var prompt;
    var continuedPromptLabel = config && config.continuedPromptLabel?
      config.continuedPromptLabel : "> ";
    var column = 0;
    var promptText = '';
    var restoreText = '';
    var continuedText = '';
    var fadeOnReset = config.fadeOnReset !== undefined ? config.fadeOnReset : true;
    // Prompt history stack
    var history = [];
    var ringn = 0;
    // For reasons unknown to The Sword of Michael himself, Opera
    // triggers and sends a key character when you hit various
    // keys like PgUp, End, etc. So there is no way of knowing
    // when a user has typed '#' or End. My solution is in the
    // typer.keydown and typer.keypress functions; I use the
    // variable below to ignore the keypress event if the keydown
    // event succeeds.
    var cancelKeyPress = 0;
    // When this value is false, the prompt will not respond to input
    var acceptInput = true;
    // When this value is true, the command has been canceled
    var cancelCommand = false;

    // External exports object
    var extern = {};

    ////////////////////////////////////////////////////////////////////////
    // Main entry point
    (function(){
      extern.promptLabel = config && config.promptLabel? config.promptLabel : "> ";
      container.append(inner);
      inner.append(typer);
      typer.css({position:'absolute',top:0,left:'-9999px'});
      if (config.welcomeMessage)
	message(config.welcomeMessage,'jquery-console-welcome');
      newPromptBox();
      if (config.autofocus) {
	inner.addClass('jquery-console-focus');
	typer.focus();
	setTimeout(function(){
	  inner.addClass('jquery-console-focus');
	  typer.focus();
	},100);
      }
      extern.inner = inner;
      extern.typer = typer;
      extern.scrollToBottom = scrollToBottom;
      extern.report = report;
    })();

    ////////////////////////////////////////////////////////////////////////
    // Reset terminal
    extern.reset = function(){
      var welcome = (typeof config.welcomeMessage != 'undefined');

      var removeElements = function() {
	inner.find('div').each(function(){
	  if (!welcome) {
	    $(this).remove();
	  } else {
	    welcome = false;
	  }
	});
      };

      if (fadeOnReset) {
	inner.parent().fadeOut(function() {
	  removeElements();
	  newPromptBox();
	  inner.parent().fadeIn(focusConsole);
	});
      }
      else {
	removeElements();
	newPromptBox();
	focusConsole();
      }
    };

    var focusConsole = function() {
      inner.addClass('jquery-console-focus');
      typer.focus();
    };

    extern.focus = function(){
      focusConsole();
    }

    ////////////////////////////////////////////////////////////////////////
    // Reset terminal
    extern.notice = function(msg,style){
      var n = $('<div class="notice"></div>').append($('<div></div>').text(msg))
	.css({visibility:'hidden'});
      container.append(n);
      var focused = true;
      if (style=='fadeout')
	setTimeout(function(){
	  n.fadeOut(function(){
	    n.remove();
	  });
	},4000);
      else if (style=='prompt') {
	var a = $('<br/><div class="action"><a href="javascript:">OK</a><div class="clear"></div></div>');
	n.append(a);
	focused = false;
	a.click(function(){ n.fadeOut(function(){ n.remove();inner.css({opacity:1}) }); });
      }
      var h = n.height();
      n.css({height:'0px',visibility:'visible'})
	.animate({height:h+'px'},function(){
	  if (!focused) inner.css({opacity:0.5});
	});
      n.css('cursor','default');
      return n;
    };

    ////////////////////////////////////////////////////////////////////////
    // Make a new prompt box
    function newPromptBox() {
      column = 0;
      promptText = '';
      ringn = 0; // Reset the position of the history ring
      enableInput();
      promptBox = $('<div class="jquery-console-prompt-box"></div>');
      var label = $('<span class="jquery-console-prompt-label"></span>');
      var labelText = extern.continuedPrompt? continuedPromptLabel : extern.promptLabel;
      promptBox.append(label.text(labelText).show());
      label.html(label.html().replace(' ','&nbsp;'));
      prompt = $('<span class="jquery-console-prompt"></span>');
      promptBox.append(prompt);
      inner.append(promptBox);
      updatePromptDisplay();
    };

    ////////////////////////////////////////////////////////////////////////
    // Handle setting focus
    container.click(function(){
      // Don't mess with the focus if there is an active selection
      if (window.getSelection().toString()) {
	return false;
      }

      inner.addClass('jquery-console-focus');
      inner.removeClass('jquery-console-nofocus');
      if (isWebkit) {
	typer.focusWithoutScrolling();
      } else {
	typer.css('position', 'fixed').focus();
      }
      scrollToBottom();
      return false;
    });

    ////////////////////////////////////////////////////////////////////////
    // Handle losing focus
    typer.blur(function(){
      inner.removeClass('jquery-console-focus');
      inner.addClass('jquery-console-nofocus');
    });

    ////////////////////////////////////////////////////////////////////////
    // Bind to the paste event of the input box so we know when we
    // get pasted data
    typer.bind('paste', function(e) {
      // wipe typer input clean just in case
      typer.val("");
      // this timeout is required because the onpaste event is
      // fired *before* the text is actually pasted
      setTimeout(function() {
	typer.consoleInsert(typer.val());
	typer.val("");
      }, 0);
    });

    ////////////////////////////////////////////////////////////////////////
    // Handle key hit before translation
    // For picking up control characters like up/left/down/right

    typer.keydown(function(e){
      cancelKeyPress = 0;
      var keyCode = e.keyCode;
      // C-c: cancel the execution
      if(e.ctrlKey && keyCode == 67) {
	cancelKeyPress = keyCode;
	cancelExecution();
	return false;
      }
      if (acceptInput) {
	if (e.shiftKey && keyCode in shiftCodes) {
	  cancelKeyPress = keyCode;
	  (shiftCodes[keyCode])();
	  return false;
	} else if (e.altKey  && keyCode in altCodes) {
	  cancelKeyPress = keyCode;
	  (altCodes[keyCode])();
	  return false;
	} else if (e.ctrlKey && keyCode in ctrlCodes) {
	  cancelKeyPress = keyCode;
	  (ctrlCodes[keyCode])();
	  return false;
	} else if (keyCode in keyCodes) {
	  cancelKeyPress = keyCode;
	  (keyCodes[keyCode])();
	  return false;
	}
      }
    });

    ////////////////////////////////////////////////////////////////////////
    // Handle key press
    typer.keypress(function(e){
      var keyCode = e.keyCode || e.which;
      if (isIgnorableKey(e)) {
	return false;
      }
      // C-v: don't insert on paste event
      if ((e.ctrlKey || e.metaKey) && String.fromCharCode(keyCode).toLowerCase() == 'v') {
	return true;
      }
      if (acceptInput && cancelKeyPress != keyCode && keyCode >= 32){
	if (cancelKeyPress) return false;
	if (
	  typeof config.charInsertTrigger == 'undefined' || (
	    typeof config.charInsertTrigger == 'function' &&
	      config.charInsertTrigger(keyCode,promptText)
	  )
	){
	  typer.consoleInsert(keyCode);
	}
      }
      if (isWebkit) return false;
    });

    function isIgnorableKey(e) {
      // for now just filter alt+tab that we receive on some platforms when
      // user switches windows (goes away from the browser)
      return ((e.keyCode == keyCodes.tab || e.keyCode == 192) && e.altKey);
    };

    ////////////////////////////////////////////////////////////////////////
    // Rotate through the command history
    function rotateHistory(n){
      if (history.length == 0) return;
      ringn += n;
      if (ringn < 0) ringn = history.length;
      else if (ringn > history.length) ringn = 0;
      var prevText = promptText;
      if (ringn == 0) {
	promptText = restoreText;
      } else {
	promptText = history[ringn - 1];
      }
      if (config.historyPreserveColumn) {
	if (promptText.length < column + 1) {
	  column = promptText.length;
	} else if (column == 0) {
	  column = promptText.length;
	}
      } else {
	column = promptText.length;
      }
      updatePromptDisplay();
    };

    function previousHistory() {
      rotateHistory(-1);
    };

    function nextHistory() {
      rotateHistory(1);
    };

    // Add something to the history ring
    function addToHistory(line){
      history.push(line);
      restoreText = '';
    };

    // Delete the character at the current position
    function deleteCharAtPos(){
      if (column < promptText.length){
	promptText =
	  promptText.substring(0,column) +
	  promptText.substring(column+1);
	restoreText = promptText;
	return true;
      } else return false;
    };

    function backDelete() {
      if (moveColumn(-1)){
	deleteCharAtPos();
	updatePromptDisplay();
      }
    };

    function forwardDelete() {
      if (deleteCharAtPos()){
	updatePromptDisplay();
      }
    };

    function deleteUntilEnd() {
      while(deleteCharAtPos()) {
	updatePromptDisplay();
      }
    };

    function deleteNextWord() {
      // A word is defined within this context as a series of alphanumeric
      // characters.
      // Delete up to the next alphanumeric character
      while(
	column < promptText.length &&
	  !isCharAlphanumeric(promptText[column])
      ) {
	deleteCharAtPos();
	updatePromptDisplay();
      }
      // Then, delete until the next non-alphanumeric character
      while(
	column < promptText.length &&
	  isCharAlphanumeric(promptText[column])
      ) {
	deleteCharAtPos();
	updatePromptDisplay();
      }
    };

    function newLine() {
      var lines = promptText.split("\n");
      var last_line = lines.slice(-1)[0];
      var spaces = last_line.match(/^(\s*)/g)[0];
      var new_line = "\n" + spaces;
      promptText += new_line;
      moveColumn(new_line.length);
      updatePromptDisplay();
    };

    ////////////////////////////////////////////////////////////////////////
    // Validate command and trigger it if valid, or show a validation error
    function commandTrigger() {
      var line = promptText;
      if (typeof config.commandValidate == 'function') {
	var ret = config.commandValidate(line);
	if (ret == true || ret == false) {
	  if (ret) {
	    handleCommand();
	  }
	} else {
	  commandResult(ret,"jquery-console-message-error");
	}
      } else {
	handleCommand();
      }
    };

    // Scroll to the bottom of the view
    function scrollToBottom() {
      var version = jQuery.fn.jquery.split('.');
      var major = parseInt(version[0]);
      var minor = parseInt(version[1]);

      // check if we're using jquery > 1.6
      if ((major == 1 && minor > 6) || major > 1) {
	inner.prop({ scrollTop: inner.prop("scrollHeight") });
      }
      else {
	inner.attr({ scrollTop: inner.attr("scrollHeight") });
      }
    };

    function cancelExecution() {
      if(typeof config.cancelHandle == 'function') {
	config.cancelHandle();
      }
    }

    ////////////////////////////////////////////////////////////////////////
    // Handle a command
    function handleCommand() {
      if (typeof config.commandHandle == 'function') {
	disableInput();
	addToHistory(promptText);
	var text = promptText;
	if (extern.continuedPrompt) {
	  if (continuedText)
	    continuedText += '\n' + promptText;
	  else continuedText = promptText;
	} else continuedText = undefined;
	if (continuedText) text = continuedText;
	var ret = config.commandHandle(text,function(msgs){
	  commandResult(msgs);
	});
	if (extern.continuedPrompt && !continuedText)
	  continuedText = promptText;
	if (typeof ret == 'boolean') {
	  if (ret) {
	    // Command succeeded without a result.
	    commandResult();
	  } else {
	    commandResult(
	      'Command failed.',
	      "jquery-console-message-error"
	    );
	  }
	} else if (typeof ret == "string") {
	  commandResult(ret,"jquery-console-message-success");
	} else if (typeof ret == 'object' && ret.length) {
	  commandResult(ret);
	} else if (extern.continuedPrompt) {
	  commandResult();
	}
      }
    };

    ////////////////////////////////////////////////////////////////////////
    // Disable input
    function disableInput() {
      acceptInput = false;
    };

    // Enable input
    function enableInput() {
      acceptInput = true;
    }

    ////////////////////////////////////////////////////////////////////////
    // Reset the prompt in invalid command
    function commandResult(msg,className) {
      column = -1;
      updatePromptDisplay();
      if (typeof msg == 'string') {
	message(msg,className);
      } else if ($.isArray(msg)) {
	for (var x in msg) {
	  var ret = msg[x];
	  message(ret.msg,ret.className);
	}
      } else { // Assume it's a DOM node or jQuery object.
	inner.append(msg);
      }
      newPromptBox();
    };

    ////////////////////////////////////////////////////////////////////////
    // Report some message into the console
    function report(msg,className) {
      var text = promptText;
      promptBox.remove();
      commandResult(msg,className);
      extern.promptText(text);
    };

    ////////////////////////////////////////////////////////////////////////
    // Display a message
    function message(msg,className) {
      var mesg = $('<div class="jquery-console-message"></div>');
      if (className) mesg.addClass(className);
      mesg.filledText(msg).hide();
      inner.append(mesg);
      mesg.show();
    };

    ////////////////////////////////////////////////////////////////////////
    // Handle normal character insertion
    // data can either be a number, which will be interpreted as the
    // numeric value of a single character, or a string
    typer.consoleInsert = function(data){
      // TODO: remove redundant indirection
      var text = (typeof data == 'number') ? String.fromCharCode(data) : data;
      var before = promptText.substring(0,column);
      var after = promptText.substring(column);
      promptText = before + text + after;
      moveColumn(text.length);
      restoreText = promptText;
      updatePromptDisplay();
    };

    ////////////////////////////////////////////////////////////////////////
    // Move to another column relative to this one
    // Negative means go back, positive means go forward.
    function moveColumn(n){
      if (column + n >= 0 && column + n <= promptText.length){
	column += n;
	return true;
      } else return false;
    };

    function moveForward() {
      if(moveColumn(1)) {
	updatePromptDisplay();
	return true;
      }
      return false;
    };

    function moveBackward() {
      if(moveColumn(-1)) {
	updatePromptDisplay();
	return true;
      }
      return false;
    };

    function moveToStart() {
      if (moveColumn(-column))
	updatePromptDisplay();
    };

    function moveToEnd() {
      if (moveColumn(promptText.length-column))
	updatePromptDisplay();
    };

    function moveToNextWord() {
      while(
	column < promptText.length &&
	  !isCharAlphanumeric(promptText[column]) &&
	  moveForward()
      ) {}
      while(
	column < promptText.length &&
	  isCharAlphanumeric(promptText[column]) &&
	  moveForward()
      ) {}
    };

    function moveToPreviousWord() {
      // Move backward until we find the first alphanumeric
      while(
	column -1 >= 0 &&
	  !isCharAlphanumeric(promptText[column-1]) &&
	  moveBackward()
      ) {}
      // Move until we find the first non-alphanumeric
      while(
	column -1 >= 0 &&
	  isCharAlphanumeric(promptText[column-1]) &&
	  moveBackward()
      ) {}
    };

    function isCharAlphanumeric(charToTest) {
      if(typeof charToTest == 'string') {
	var code = charToTest.charCodeAt();
	return (code >= 'A'.charCodeAt() && code <= 'Z'.charCodeAt()) ||
	  (code >= 'a'.charCodeAt() && code <= 'z'.charCodeAt()) ||
	  (code >= '0'.charCodeAt() && code <= '9'.charCodeAt());
      }
      return false;
    };

    function doComplete() {
      if(typeof config.completeHandle == 'function') {
	var completions = config.completeHandle(promptText);
	var len = completions.length;
	if (len === 1) {
	  extern.promptText(promptText + completions[0]);
	} else if (len > 1 && config.cols) {
	  var prompt = promptText;
	  // Compute the number of rows that will fit in the width
	  var max = 0;
	  for (var i = 0;i < len;i++) {
	    max = Math.max(max, completions[i].length);
	  }
	  max += 2;
	  var n = Math.floor(config.cols / max);
	  var buffer = "";
	  var col = 0;
	  for (i = 0;i < len;i++) {
	    var completion = completions[i];
	    buffer += completions[i];
	    for (var j = completion.length;j < max;j++) {
	      buffer += " ";
	    }
	    if (++col >= n) {
	      buffer += "\n";
	      col = 0;
	    }
	  }
	  commandResult(buffer,"jquery-console-message-value");
	  extern.promptText(prompt);
	}
      }
    };

    function doNothing() {};

    extern.promptText = function(text){
      if (typeof text === 'string') {
	promptText = text;
	column = promptText.length;
	updatePromptDisplay();
      }
      return promptText;
    };

    ////////////////////////////////////////////////////////////////////////
    // Update the prompt display
    function updatePromptDisplay(){
      var line = promptText;
      var html = '';
      if (column > 0 && line == ''){
	// When we have an empty line just display a cursor.
	html = cursor;
      } else if (column == promptText.length){
	// We're at the end of the line, so we need to display
	// the text *and* cursor.
	html = htmlEncode(line) + cursor;
      } else {
	// Grab the current character, if there is one, and
	// make it the current cursor.
	var before = line.substring(0, column);
	var current = line.substring(column,column+1);
	if (current){
	  current =
	    '<span class="jquery-console-cursor">' +
	    htmlEncode(current) +
	    '</span>';
	}
	var after = line.substring(column+1);
	html = htmlEncode(before) + current + htmlEncode(after);
      }
      prompt.html(html);
      scrollToBottom();
    };

    // Simple HTML encoding
    // Simply replace '<', '>' and '&'
    // TODO: Use jQuery's .html() trick, or grab a proper, fast
    // HTML encoder.
    function htmlEncode(text){
      return (
	text.replace(/&/g,'&amp;')
	  .replace(/</g,'&lt;')
	  .replace(/</g,'&lt;')
	  .replace(/ /g,'&nbsp;')
	  .replace(/\n/g,'<br />')
      );
    };

    return extern;
  };
  // Simple utility for printing messages
  $.fn.filledText = function(txt){
    $(this).text(txt);
    $(this).html($(this).html().replace(/\n/g,'<br/>'));
    return this;
  };

  // Alternative method for focus without scrolling
  $.fn.focusWithoutScrolling = function(){
    var x = window.scrollX, y = window.scrollY;
    $(this).focus();
    window.scrollTo(x, y);
  };
})(jQuery);