// 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 longestCommonPrefix(strings) {
    var arr = strings.concat().sort();
    var i = 0;
    for (var i = 0; i < arr[0].length; ++i) {
      if (arr[0][i] != arr[arr.length - 1][i])
        break;
    }
    return arr[0].substring(0, i);
  }

  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) {
        var prefix = longestCommonPrefix(completions);
        if (prefix.length > 0) {
          extern.promptText(promptText + prefix);
        } else if (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){
  $(this).html(txt);
  //$(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);
