/* Copyright 2012 Mozilla Foundation

*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

var FontInspector = (function FontInspectorClosure() {

var fonts;
var active = false;
var fontAttribute = 'data-font-name';
function removeSelection() {
  var divs = document.querySelectorAll('div[' + fontAttribute + ']');
  for (var i = 0, ii = divs.length; i < ii; ++i) {
    var div = divs[i];
    div.className = '';
  }
}
function resetSelection() {
  var divs = document.querySelectorAll('div[' + fontAttribute + ']');
  for (var i = 0, ii = divs.length; i < ii; ++i) {
    var div = divs[i];
    div.className = 'debuggerHideText';
  }
}
function selectFont(fontName, show) {
  var divs = document.querySelectorAll('div[' + fontAttribute + '=' +
                                       fontName + ']');
  for (var i = 0, ii = divs.length; i < ii; ++i) {
    var div = divs[i];
    div.className = show ? 'debuggerShowText' : 'debuggerHideText';
  }
}
function textLayerClick(e) {
  if (!e.target.dataset.fontName ||
      e.target.tagName.toUpperCase() !== 'DIV') {
    return;
  }
  var fontName = e.target.dataset.fontName;
  var selects = document.getElementsByTagName('input');
  for (var i = 0; i < selects.length; ++i) {
    var select = selects[i];
    if (select.dataset.fontName !== fontName) {
      continue;
    }
    select.checked = !select.checked;
    selectFont(fontName, select.checked);
    select.scrollIntoView();
  }
}
return {
  // Properties/functions needed by PDFBug.
  id: 'FontInspector',
  name: 'Font Inspector',
  panel: null,
  manager: null,
  init: function init(pdfjsLib) {
    var panel = this.panel;
    panel.setAttribute('style', 'padding: 5px;');
    var tmp = document.createElement('button');
    tmp.addEventListener('click', resetSelection);
    tmp.textContent = 'Refresh';
    panel.appendChild(tmp);

    fonts = document.createElement('div');
    panel.appendChild(fonts);
  },
  cleanup: function cleanup() {
    fonts.textContent = '';
  },
  enabled: false,
  get active() {
    return active;
  },
  set active(value) {
    active = value;
    if (active) {
      document.body.addEventListener('click', textLayerClick, true);
      resetSelection();
    } else {
      document.body.removeEventListener('click', textLayerClick, true);
      removeSelection();
    }
  },
  // FontInspector specific functions.
  fontAdded: function fontAdded(fontObj, url) {
    function properties(obj, list) {
      var moreInfo = document.createElement('table');
      for (var i = 0; i < list.length; i++) {
        var tr = document.createElement('tr');
        var td1 = document.createElement('td');
        td1.textContent = list[i];
        tr.appendChild(td1);
        var td2 = document.createElement('td');
        td2.textContent = obj[list[i]].toString();
        tr.appendChild(td2);
        moreInfo.appendChild(tr);
      }
      return moreInfo;
    }
    var moreInfo = properties(fontObj, ['name', 'type']);
    var fontName = fontObj.loadedName;
    var font = document.createElement('div');
    var name = document.createElement('span');
    name.textContent = fontName;
    var download = document.createElement('a');
    if (url) {
      url = /url\(['"]?([^\)"']+)/.exec(url);
      download.href = url[1];
    } else if (fontObj.data) {
      url = URL.createObjectURL(new Blob([fontObj.data], {
        type: fontObj.mimeType
      }));
      download.href = url;
    }
    download.textContent = 'Download';
    var logIt = document.createElement('a');
    logIt.href = '';
    logIt.textContent = 'Log';
    logIt.addEventListener('click', function(event) {
      event.preventDefault();
      console.log(fontObj);
    });
    var select = document.createElement('input');
    select.setAttribute('type', 'checkbox');
    select.dataset.fontName = fontName;
    select.addEventListener('click', (function(select, fontName) {
      return (function() {
         selectFont(fontName, select.checked);
      });
    })(select, fontName));
    font.appendChild(select);
    font.appendChild(name);
    font.appendChild(document.createTextNode(' '));
    font.appendChild(download);
    font.appendChild(document.createTextNode(' '));
    font.appendChild(logIt);
    font.appendChild(moreInfo);
    fonts.appendChild(font);
    // Somewhat of a hack, should probably add a hook for when the text layer
    // is done rendering.
    setTimeout(function() {
      if (this.active) {
        resetSelection();
      }
    }.bind(this), 2000);
  }
};

})();

var opMap;

// Manages all the page steppers. var StepperManager = (function StepperManagerClosure() {

var steppers = [];
var stepperDiv = null;
var stepperControls = null;
var stepperChooser = null;
var breakPoints = Object.create(null);
return {
  // Properties/functions needed by PDFBug.
  id: 'Stepper',
  name: 'Stepper',
  panel: null,
  manager: null,
  init: function init(pdfjsLib) {
    var self = this;
    this.panel.setAttribute('style', 'padding: 5px;');
    stepperControls = document.createElement('div');
    stepperChooser = document.createElement('select');
    stepperChooser.addEventListener('change', function(event) {
      self.selectStepper(this.value);
    });
    stepperControls.appendChild(stepperChooser);
    stepperDiv = document.createElement('div');
    this.panel.appendChild(stepperControls);
    this.panel.appendChild(stepperDiv);
    if (sessionStorage.getItem('pdfjsBreakPoints')) {
      breakPoints = JSON.parse(sessionStorage.getItem('pdfjsBreakPoints'));
    }

    opMap = Object.create(null);
    for (var key in pdfjsLib.OPS) {
      opMap[pdfjsLib.OPS[key]] = key;
    }
  },
  cleanup: function cleanup() {
    stepperChooser.textContent = '';
    stepperDiv.textContent = '';
    steppers = [];
  },
  enabled: false,
  active: false,
  // Stepper specific functions.
  create: function create(pageIndex) {
    var debug = document.createElement('div');
    debug.id = 'stepper' + pageIndex;
    debug.setAttribute('hidden', true);
    debug.className = 'stepper';
    stepperDiv.appendChild(debug);
    var b = document.createElement('option');
    b.textContent = 'Page ' + (pageIndex + 1);
    b.value = pageIndex;
    stepperChooser.appendChild(b);
    var initBreakPoints = breakPoints[pageIndex] || [];
    var stepper = new Stepper(debug, pageIndex, initBreakPoints);
    steppers.push(stepper);
    if (steppers.length === 1) {
      this.selectStepper(pageIndex, false);
    }
    return stepper;
  },
  selectStepper: function selectStepper(pageIndex, selectPanel) {
    var i;
    pageIndex = pageIndex | 0;
    if (selectPanel) {
      this.manager.selectPanel(this);
    }
    for (i = 0; i < steppers.length; ++i) {
      var stepper = steppers[i];
      if (stepper.pageIndex === pageIndex) {
        stepper.panel.removeAttribute('hidden');
      } else {
        stepper.panel.setAttribute('hidden', true);
      }
    }
    var options = stepperChooser.options;
    for (i = 0; i < options.length; ++i) {
      var option = options[i];
      option.selected = (option.value | 0) === pageIndex;
    }
  },
  saveBreakPoints: function saveBreakPoints(pageIndex, bps) {
    breakPoints[pageIndex] = bps;
    sessionStorage.setItem('pdfjsBreakPoints', JSON.stringify(breakPoints));
  }
};

})();

// The stepper for each page's IRQueue. var Stepper = (function StepperClosure() {

// Shorter way to create element and optionally set textContent.
function c(tag, textContent) {
  var d = document.createElement(tag);
  if (textContent) {
    d.textContent = textContent;
  }
  return d;
}

function simplifyArgs(args) {
  if (typeof args === 'string') {
    var MAX_STRING_LENGTH = 75;
    return args.length <= MAX_STRING_LENGTH ? args :
      args.substr(0, MAX_STRING_LENGTH) + '...';
  }
  if (typeof args !== 'object' || args === null) {
    return args;
  }
  if ('length' in args) { // array
    var simpleArgs = [], i, ii;
    var MAX_ITEMS = 10;
    for (i = 0, ii = Math.min(MAX_ITEMS, args.length); i < ii; i++) {
      simpleArgs.push(simplifyArgs(args[i]));
    }
    if (i < args.length) {
      simpleArgs.push('...');
    }
    return simpleArgs;
  }
  var simpleObj = {};
  for (var key in args) {
    simpleObj[key] = simplifyArgs(args[key]);
  }
  return simpleObj;
}

function Stepper(panel, pageIndex, initialBreakPoints) {
  this.panel = panel;
  this.breakPoint = 0;
  this.nextBreakPoint = null;
  this.pageIndex = pageIndex;
  this.breakPoints = initialBreakPoints;
  this.currentIdx = -1;
  this.operatorListIdx = 0;
}
Stepper.prototype = {
  init: function init(operatorList) {
    var panel = this.panel;
    var content = c('div', 'c=continue, s=step');
    var table = c('table');
    content.appendChild(table);
    table.cellSpacing = 0;
    var headerRow = c('tr');
    table.appendChild(headerRow);
    headerRow.appendChild(c('th', 'Break'));
    headerRow.appendChild(c('th', 'Idx'));
    headerRow.appendChild(c('th', 'fn'));
    headerRow.appendChild(c('th', 'args'));
    panel.appendChild(content);
    this.table = table;
    this.updateOperatorList(operatorList);
  },
  updateOperatorList: function updateOperatorList(operatorList) {
    var self = this;

    function cboxOnClick() {
      var x = +this.dataset.idx;
      if (this.checked) {
        self.breakPoints.push(x);
      } else {
        self.breakPoints.splice(self.breakPoints.indexOf(x), 1);
      }
      StepperManager.saveBreakPoints(self.pageIndex, self.breakPoints);
    }

    var MAX_OPERATORS_COUNT = 15000;
    if (this.operatorListIdx > MAX_OPERATORS_COUNT) {
      return;
    }

    var chunk = document.createDocumentFragment();
    var operatorsToDisplay = Math.min(MAX_OPERATORS_COUNT,
                                      operatorList.fnArray.length);
    for (var i = this.operatorListIdx; i < operatorsToDisplay; i++) {
      var line = c('tr');
      line.className = 'line';
      line.dataset.idx = i;
      chunk.appendChild(line);
      var checked = this.breakPoints.indexOf(i) !== -1;
      var args = operatorList.argsArray[i] || [];

      var breakCell = c('td');
      var cbox = c('input');
      cbox.type = 'checkbox';
      cbox.className = 'points';
      cbox.checked = checked;
      cbox.dataset.idx = i;
      cbox.onclick = cboxOnClick;

      breakCell.appendChild(cbox);
      line.appendChild(breakCell);
      line.appendChild(c('td', i.toString()));
      var fn = opMap[operatorList.fnArray[i]];
      var decArgs = args;
      if (fn === 'showText') {
        var glyphs = args[0];
        var newArgs = [];
        var str = [];
        for (var j = 0; j < glyphs.length; j++) {
          var glyph = glyphs[j];
          if (typeof glyph === 'object' && glyph !== null) {
            str.push(glyph.fontChar);
          } else {
            if (str.length > 0) {
              newArgs.push(str.join(''));
              str = [];
            }
            newArgs.push(glyph); // null or number
          }
        }
        if (str.length > 0) {
          newArgs.push(str.join(''));
        }
        decArgs = [newArgs];
      }
      line.appendChild(c('td', fn));
      line.appendChild(c('td', JSON.stringify(simplifyArgs(decArgs))));
    }
    if (operatorsToDisplay < operatorList.fnArray.length) {
      line = c('tr');
      var lastCell = c('td', '...');
      lastCell.colspan = 4;
      chunk.appendChild(lastCell);
    }
    this.operatorListIdx = operatorList.fnArray.length;
    this.table.appendChild(chunk);
  },
  getNextBreakPoint: function getNextBreakPoint() {
    this.breakPoints.sort(function(a, b) { return a - b; });
    for (var i = 0; i < this.breakPoints.length; i++) {
      if (this.breakPoints[i] > this.currentIdx) {
        return this.breakPoints[i];
      }
    }
    return null;
  },
  breakIt: function breakIt(idx, callback) {
    StepperManager.selectStepper(this.pageIndex, true);
    var self = this;
    var dom = document;
    self.currentIdx = idx;
    var listener = function(e) {
      switch (e.keyCode) {
        case 83: // step
          dom.removeEventListener('keydown', listener, false);
          self.nextBreakPoint = self.currentIdx + 1;
          self.goTo(-1);
          callback();
          break;
        case 67: // continue
          dom.removeEventListener('keydown', listener, false);
          var breakPoint = self.getNextBreakPoint();
          self.nextBreakPoint = breakPoint;
          self.goTo(-1);
          callback();
          break;
      }
    };
    dom.addEventListener('keydown', listener, false);
    self.goTo(idx);
  },
  goTo: function goTo(idx) {
    var allRows = this.panel.getElementsByClassName('line');
    for (var x = 0, xx = allRows.length; x < xx; ++x) {
      var row = allRows[x];
      if ((row.dataset.idx | 0) === idx) {
        row.style.backgroundColor = 'rgb(251,250,207)';
        row.scrollIntoView();
      } else {
        row.style.backgroundColor = null;
      }
    }
  }
};
return Stepper;

})();

var Stats = (function Stats() {

var stats = [];
function clear(node) {
  while (node.hasChildNodes()) {
    node.removeChild(node.lastChild);
  }
}
function getStatIndex(pageNumber) {
  for (var i = 0, ii = stats.length; i < ii; ++i) {
    if (stats[i].pageNumber === pageNumber) {
      return i;
    }
  }
  return false;
}
return {
  // Properties/functions needed by PDFBug.
  id: 'Stats',
  name: 'Stats',
  panel: null,
  manager: null,
  init: function init(pdfjsLib) {
    this.panel.setAttribute('style', 'padding: 5px;');
    pdfjsLib.PDFJS.enableStats = true;
  },
  enabled: false,
  active: false,
  // Stats specific functions.
  add: function(pageNumber, stat) {
    if (!stat) {
      return;
    }
    var statsIndex = getStatIndex(pageNumber);
    if (statsIndex !== false) {
      var b = stats[statsIndex];
      this.panel.removeChild(b.div);
      stats.splice(statsIndex, 1);
    }
    var wrapper = document.createElement('div');
    wrapper.className = 'stats';
    var title = document.createElement('div');
    title.className = 'title';
    title.textContent = 'Page: ' + pageNumber;
    var statsDiv = document.createElement('div');
    statsDiv.textContent = stat.toString();
    wrapper.appendChild(title);
    wrapper.appendChild(statsDiv);
    stats.push({ pageNumber: pageNumber, div: wrapper });
    stats.sort(function(a, b) { return a.pageNumber - b.pageNumber; });
    clear(this.panel);
    for (var i = 0, ii = stats.length; i < ii; ++i) {
      this.panel.appendChild(stats[i].div);
    }
  },
  cleanup: function () {
    stats = [];
    clear(this.panel);
  }
};

})();

// Manages all the debugging tools. var PDFBug = (function PDFBugClosure() {

var panelWidth = 300;
var buttons = [];
var activePanel = null;

return {
  tools: [
    FontInspector,
    StepperManager,
    Stats
  ],
  enable: function(ids) {
    var all = false, tools = this.tools;
    if (ids.length === 1 && ids[0] === 'all') {
      all = true;
    }
    for (var i = 0; i < tools.length; ++i) {
      var tool = tools[i];
      if (all || ids.indexOf(tool.id) !== -1) {
        tool.enabled = true;
      }
    }
    if (!all) {
      // Sort the tools by the order they are enabled.
      tools.sort(function(a, b) {
        var indexA = ids.indexOf(a.id);
        indexA = indexA < 0 ? tools.length : indexA;
        var indexB = ids.indexOf(b.id);
        indexB = indexB < 0 ? tools.length : indexB;
        return indexA - indexB;
      });
    }
  },
  init: function init(pdfjsLib, container) {
    /*
     * Basic Layout:
     * PDFBug
     *  Controls
     *  Panels
     *    Panel
     *    Panel
     *    ...
     */
    var ui = document.createElement('div');
    ui.id = 'PDFBug';

    var controls = document.createElement('div');
    controls.setAttribute('class', 'controls');
    ui.appendChild(controls);

    var panels = document.createElement('div');
    panels.setAttribute('class', 'panels');
    ui.appendChild(panels);

    container.appendChild(ui);
    container.style.right = panelWidth + 'px';

    // Initialize all the debugging tools.
    var tools = this.tools;
    var self = this;
    for (var i = 0; i < tools.length; ++i) {
      var tool = tools[i];
      var panel = document.createElement('div');
      var panelButton = document.createElement('button');
      panelButton.textContent = tool.name;
      panelButton.addEventListener('click', (function(selected) {
        return function(event) {
          event.preventDefault();
          self.selectPanel(selected);
        };
      })(i));
      controls.appendChild(panelButton);
      panels.appendChild(panel);
      tool.panel = panel;
      tool.manager = this;
      if (tool.enabled) {
        tool.init(pdfjsLib);
      } else {
        panel.textContent = tool.name + ' is disabled. To enable add ' +
                            ' "' + tool.id + '" to the pdfBug parameter ' +
                            'and refresh (separate multiple by commas).';
      }
      buttons.push(panelButton);
    }
    this.selectPanel(0);
  },
  cleanup: function cleanup() {
    for (var i = 0, ii = this.tools.length; i < ii; i++) {
      if (this.tools[i].enabled) {
        this.tools[i].cleanup();
      }
    }
  },
  selectPanel: function selectPanel(index) {
    if (typeof index !== 'number') {
      index = this.tools.indexOf(index);
    }
    if (index === activePanel) {
      return;
    }
    activePanel = index;
    var tools = this.tools;
    for (var j = 0; j < tools.length; ++j) {
      if (j === index) {
        buttons[j].setAttribute('class', 'active');
        tools[j].active = true;
        tools[j].panel.removeAttribute('hidden');
      } else {
        buttons[j].setAttribute('class', '');
        tools[j].active = false;
        tools[j].panel.setAttribute('hidden', 'true');
      }
    }
  }
};

})();