/*********************************************************
 * The publicly exposed MathQuill API.
 ********************************************************/

var API = {}, Options = P(), optionProcessors = {}, Progenote = P(), EMBEDS = {};

/**
 * Interface Versioning (#459, #495) to allow us to virtually guarantee
 * backcompat. v0.10.x introduces it, so for now, don't completely break the
 * API for people who don't know about it, just complain with console.warn().
 *
 * The methods are shimmed in outro.js so that MQ.MathField.prototype etc can
 * be accessed.
 */
function insistOnInterVer() {
  if (window.console) console.warn(
    'You are using the MathQuill API without specifying an interface version, ' +
    'which will fail in v1.0.0. Easiest fix is to do the following before ' +
    'doing anything else:\n' +
    '\n' +
    '    MathQuill = MathQuill.getInterface(1);\n' +
    '    // now MathQuill.MathField() works like it used to\n' +
    '\n' +
    'See also the "`dev` branch (2014–2015) → v0.10.0 Migration Guide" at\n' +
    '  https://github.com/mathquill/mathquill/wiki/%60dev%60-branch-(2014%E2%80%932015)-%E2%86%92-v0.10.0-Migration-Guide'
  );
}
// globally exported API object
function MathQuill(el) {
  insistOnInterVer();
  return MQ1(el);
};
MathQuill.prototype = Progenote.p;
MathQuill.interfaceVersion = function(v) {
  // shim for #459-era interface versioning (ended with #495)
  if (v !== 1) throw 'Only interface version 1 supported. You specified: ' + v;
  insistOnInterVer = function() {
    if (window.console) console.warn(
      'You called MathQuill.interfaceVersion(1); to specify the interface ' +
      'version, which will fail in v1.0.0. You can fix this easily by doing ' +
      'this before doing anything else:\n' +
      '\n' +
      '    MathQuill = MathQuill.getInterface(1);\n' +
      '    // now MathQuill.MathField() works like it used to\n' +
      '\n' +
      'See also the "`dev` branch (2014–2015) → v0.10.0 Migration Guide" at\n' +
      '  https://github.com/mathquill/mathquill/wiki/%60dev%60-branch-(2014%E2%80%932015)-%E2%86%92-v0.10.0-Migration-Guide'
    );
  };
  insistOnInterVer();
  return MathQuill;
};
MathQuill.getInterface = getInterface;

var MIN = getInterface.MIN = 1, MAX = getInterface.MAX = 2;
function getInterface(v) {
  if (!(MIN <= v && v <= MAX)) throw 'Only interface versions between ' +
    MIN + ' and ' + MAX + ' supported. You specified: ' + v;

  /**
   * Function that takes an HTML element and, if it's the root HTML element of a
   * static math or math or text field, returns an API object for it (else, null).
   *
   *   var mathfield = MQ.MathField(mathFieldSpan);
   *   assert(MQ(mathFieldSpan).id === mathfield.id);
   *   assert(MQ(mathFieldSpan).id === MQ(mathFieldSpan).id);
   *
   */
  function MQ(el) {
    if (!el || !el.nodeType) return null; // check that `el` is a HTML element, using the
      // same technique as jQuery: https://github.com/jquery/jquery/blob/679536ee4b7a92ae64a5f58d90e9cc38c001e807/src/core/init.js#L92
    var blockId = $(el).children('.mq-root-block').attr(mqBlockId);
    var ctrlr = blockId && Node.byId[blockId].controller;
    return ctrlr ? APIClasses[ctrlr.KIND_OF_MQ](ctrlr) : null;
  };
  var APIClasses = {};

  MQ.L = L;
  MQ.R = R;

  function config(currentOptions, newOptions) {
    if (newOptions && newOptions.handlers) {
      newOptions.handlers = { fns: newOptions.handlers, APIClasses: APIClasses };
    }
    for (var name in newOptions) if (newOptions.hasOwnProperty(name)) {
      var value = newOptions[name], processor = optionProcessors[name];
      currentOptions[name] = (processor ? processor(value) : value);
    }
  }
  MQ.config = function(opts) { config(Options.p, opts); return this; };
  MQ.registerEmbed = function(name, options) {
    if (!/^[a-z][a-z0-9]*$/i.test(name)) {
      throw 'Embed name must start with letter and be only letters and digits';
    }
    EMBEDS[name] = options;
  };

  var AbstractMathQuill = APIClasses.AbstractMathQuill = P(Progenote, function(_) {
    _.init = function(ctrlr) {
      this.__controller = ctrlr;
      this.__options = ctrlr.options;
      this.id = ctrlr.id;
      this.data = ctrlr.data;
    };
    _.__mathquillify = function(classNames) {
      var ctrlr = this.__controller, root = ctrlr.root, el = ctrlr.container;
      ctrlr.createTextarea();

      var contents = el.addClass(classNames).contents().detach();
      root.jQ =
        $('<span class="mq-root-block"/>').attr(mqBlockId, root.id).appendTo(el);
      this.latex(contents.text());

      this.revert = function() {
        return el.empty().unbind('.mathquill')
        .removeClass('mq-editable-field mq-math-mode mq-text-mode')
        .append(contents);
      };
    };
    _.config = function(opts) { config(this.__options, opts); return this; };
    _.el = function() { return this.__controller.container[0]; };
    _.text = function() { return this.__controller.exportText(); };
    _.latex = function(latex) {
      if (arguments.length > 0) {
        this.__controller.renderLatexMath(latex);
        if (this.__controller.blurred) this.__controller.cursor.hide().parent.blur();
        return this;
      }
      return this.__controller.exportLatex();
    };
    _.html = function() {
      return this.__controller.root.jQ.html()
        .replace(/ mathquill-(?:command|block)-id="?\d+"?/g, '')
        .replace(/<span class="?mq-cursor( mq-blink)?"?>.?<\/span>/i, '')
        .replace(/ mq-hasCursor|mq-hasCursor ?/, '')
        .replace(/ class=(""|(?= |>))/g, '');
    };
    _.reflow = function() {
      this.__controller.root.postOrder('reflow');
      return this;
    };
  });
  MQ.prototype = AbstractMathQuill.prototype;

  APIClasses.EditableField = P(AbstractMathQuill, function(_, super_) {
    _.__mathquillify = function() {
      super_.__mathquillify.apply(this, arguments);
      this.__controller.editable = true;
      this.__controller.delegateMouseEvents();
      this.__controller.editablesTextareaEvents();
      return this;
    };
    _.focus = function() { this.__controller.textarea.focus(); return this; };
    _.blur = function() { this.__controller.textarea.blur(); return this; };
    _.write = function(latex) {
      this.__controller.writeLatex(latex);
      this.__controller.scrollHoriz();
      if (this.__controller.blurred) this.__controller.cursor.hide().parent.blur();
      return this;
    };
    _.cmd = function(cmd) {
      var ctrlr = this.__controller.notify(), cursor = ctrlr.cursor;
      if (/^\\[a-z]+$/i.test(cmd)) {
        cmd = cmd.slice(1);
        var klass = LatexCmds[cmd];
        if (klass) {
          cmd = klass(cmd);
          if (cursor.selection) cmd.replaces(cursor.replaceSelection());
          cmd.createLeftOf(cursor.show());
          this.__controller.scrollHoriz();
        }
        else /* TODO: API needs better error reporting */;
      }
      else cursor.parent.write(cursor, cmd);
      if (ctrlr.blurred) cursor.hide().parent.blur();
      return this;
    };
    _.select = function() {
      var ctrlr = this.__controller;
      ctrlr.notify('move').cursor.insAtRightEnd(ctrlr.root);
      while (ctrlr.cursor[L]) ctrlr.selectLeft();
      return this;
    };
    _.clearSelection = function() {
      this.__controller.cursor.clearSelection();
      return this;
    };

    _.moveToDirEnd = function(dir) {
      this.__controller.notify('move').cursor.insAtDirEnd(dir, this.__controller.root);
      return this;
    };
    _.moveToLeftEnd = function() { return this.moveToDirEnd(L); };
    _.moveToRightEnd = function() { return this.moveToDirEnd(R); };

    _.keystroke = function(keys) {
      var keys = keys.replace(/^\s+|\s+$/g, '').split(/\s+/);
      for (var i = 0; i < keys.length; i += 1) {
        this.__controller.keystroke(keys[i], { preventDefault: noop });
      }
      return this;
    };
    _.typedText = function(text) {
      for (var i = 0; i < text.length; i += 1) this.__controller.typedText(text.charAt(i));
      return this;
    };
    _.dropEmbedded = function(pageX, pageY, options) {
      var clientX = pageX - $(window).scrollLeft();
      var clientY = pageY - $(window).scrollTop();

      var el = document.elementFromPoint(clientX, clientY);
      this.__controller.seek($(el), pageX, pageY);
      var cmd = Embed().setOptions(options);
      cmd.createLeftOf(this.__controller.cursor);
    };
    _.clickAt = function(clientX, clientY, target) {
      target = target || document.elementFromPoint(clientX, clientY);

      var ctrlr = this.__controller, root = ctrlr.root;
      if (!jQuery.contains(root.jQ[0], target)) target = root.jQ[0];
      ctrlr.seek($(target), clientX + pageXOffset, clientY + pageYOffset);
      if (ctrlr.blurred) this.focus();
      return this;
    };
    _.ignoreNextMousedown = function(fn) {
      this.__controller.cursor.options.ignoreNextMousedown = fn;
      return this;
    };
  });
  MQ.EditableField = function() { throw "wtf don't call me, I'm 'abstract'"; };
  MQ.EditableField.prototype = APIClasses.EditableField.prototype;

  /**
   * Export the API functions that MathQuill-ify an HTML element into API objects
   * of each class. If the element had already been MathQuill-ified but into a
   * different kind (or it's not an HTML element), return null.
   */
  for (var kind in API) (function(kind, defAPIClass) {
    var APIClass = APIClasses[kind] = defAPIClass(APIClasses);
    MQ[kind] = function(el, opts) {
      var mq = MQ(el);
      if (mq instanceof APIClass || !el || !el.nodeType) return mq;
      var ctrlr = Controller(APIClass.RootBlock(), $(el), Options());
      ctrlr.KIND_OF_MQ = kind;
      return APIClass(ctrlr).__mathquillify(opts, v);
    };
    MQ[kind].prototype = APIClass.prototype;
  }(kind, API[kind]));

  return MQ;
}

MathQuill.noConflict = function() {
  window.MathQuill = origMathQuill;
  return MathQuill;
};
var origMathQuill = window.MathQuill;
window.MathQuill = MathQuill;

function RootBlockMixin(_) {
  var names = 'moveOutOf deleteOutOf selectOutOf upOutOf downOutOf'.split(' ');
  for (var i = 0; i < names.length; i += 1) (function(name) {
    _[name] = function(dir) { this.controller.handle(name, dir); };
  }(names[i]));
  _.reflow = function() {
    this.controller.handle('reflow');
    this.controller.handle('edited');
    this.controller.handle('edit');
  };
}