/*
   Implement Twitter/Weibo @ mentions

   Copyright (c) 2012 chord.luo@gmail.com

   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
   "Software"), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
var keyname;

(function() {

  (function($) {
    var At, AtView, Mirror, log, _DEFAULT_TPL, _evalTpl, _highlighter, _isNil, _objectify, _sorter, _unique;
    Mirror = {
      $mirror: null,
      css: ["overflowY", "height", "width", "paddingTop", "paddingLeft", "paddingRight", "paddingBottom", "marginTop", "marginLeft", "marginRight", "marginBottom", 'fontFamily', 'borderStyle', 'borderWidth', 'wordWrap', 'fontSize', 'lineHeight', 'overflowX'],
      init: function($origin) {
        var $mirror, css;
        $mirror = $('<div></div>');
        css = {
          position: 'absolute',
          left: -9999,
          top: 0,
          zIndex: -20000,
          'white-space': 'pre-wrap'
        };
        $.each(this.css, function(i, p) {
          return css[p] = $origin.css(p);
        });
        $mirror.css(css);
        this.$mirror = $mirror;
        $origin.after($mirror);
        return this;
      },
      setContent: function(html) {
        this.$mirror.html(html);
        return this;
      },
      getFlagRect: function() {
        var $flag, pos, rect;
        $flag = this.$mirror.find("span#flag");
        pos = $flag.position();
        rect = {
          left: pos.left,
          top: pos.top,
          bottom: $flag.height() + pos.top
        };
        this.$mirror.remove();
        return rect;
      }
    };
    At = function(inputor) {
      var $inputor,
        _this = this;
      $inputor = this.$inputor = $(inputor);
      this.options = {};
      this.query = {
        text: "",
        start: 0,
        stop: 0
      };
      this._cache = {};
      this.pos = 0;
      this.flags = {};
      this.theflag = null;
      this.search_word = {};
      this.view = AtView;
      this.mirror = Mirror;
      $inputor.on("keyup.inputor", function(e) {
        var lookup, stop;
        stop = e.keyCode === 40 || e.keyCode === 38;
        lookup = !(stop && _this.view.isShowing());
        if (lookup) {
          return _this.lookup();
        }
      }).on("mouseup.inputor", function(e) {
        return _this.lookup();
      });
      this.init();
      log("At.new", $inputor[0]);
      return this;
    };
    At.prototype = {
      constructor: At,
      init: function() {
        var _this = this;
        this.$inputor.on('keydown.inputor', function(e) {
          return _this.onkeydown(e);
        }).on('scroll.inputor', function(e) {
          return _this.view.hide();
        }).on('blur.inputor', function(e) {
          return _this.view.hide(1000);
        });
        return log("At.init", this.$inputor[0]);
      },
      reg: function(flag, options) {
        var opt, _base, _default;
        opt = {};
        if ($.isFunction(options)) {
          opt['callback'] = options;
        } else {
          opt = options;
        }
        _default = (_base = this.options)[flag] || (_base[flag] = $.fn.atWho["default"]);
        this.options[flag] = $.extend({}, _default, opt);
        return log("At.reg", this.$inputor[0], flag, options);
      },
      dataValue: function() {
        var match, search_word;
        search_word = this.search_word[this.theflag];
        if (search_word) {
          return search_word;
        }
        match = /data-value=["']?\$\{(\w+)\}/g.exec(this.getOpt('tpl'));
        return this.search_word[this.theflag] = !_isNil(match) ? match[1] : null;
      },
      getOpt: function(key) {
        try {
          return this.options[this.theflag][key];
        } catch (error) {
          return null;
        }
      },
      rect: function() {
        var $inputor, Sel, at_rect, bottom, format, html, offset, start_range, x, y;
        $inputor = this.$inputor;
        if (document.selection) {
          Sel = document.selection.createRange();
          x = Sel.boundingLeft + $inputor.scrollLeft();
          y = Sel.boundingTop + $(window).scrollTop() + $inputor.scrollTop();
          bottom = y + Sel.boundingHeight;
          
          return {
            top: y - 13,
            left: x - 12,
            bottom: bottom
          };
        }
        format = function(value) {
          return value.replace(/</g, '&lt').replace(/>/g, '&gt').replace(/`/g, '&#96').replace(/"/g, '&quot').replace(/\r\n|\r|\n/g, "<br />");
        };
        /* 克隆完inputor后将原来的文本内容根据
          @的位置进行分块,以获取@块在inputor(输入框)里的position
        */

        start_range = $inputor.val().slice(0, this.pos - 1);
        html = "<span>" + format(start_range) + "</span>";
        html += "<span id='flag'>@</span>";
        /*
                      将inputor的 offset(相对于document)
                      和@在inputor里的position相加
                      就得到了@相对于document的offset.
                      当然,还要加上行高和滚动条的偏移量.
        */

        offset = $inputor.offset();
        at_rect = this.mirror.init($inputor).setContent(html).getFlagRect();
        x = offset.left + at_rect.left - $inputor.scrollLeft();
        y = offset.top - $inputor.scrollTop();
        bottom = y + at_rect.bottom;
        y += at_rect.top;
        return {
          top: y,
          left: x,
          bottom: bottom + 2
        };
      },
      cache: function(value) {
        var key, _base;
        key = this.query.text;
        if (!this.getOpt("cache") || !key) {
          return null;
        }
        return (_base = this._cache)[key] || (_base[key] = value);
      },
      getKeyname: function() {
        var $inputor, caret_pos, end, key, matched, start, subtext, text,
          _this = this;
        $inputor = this.$inputor;
        text = $inputor.val();
        caret_pos = $inputor.caretPos();
        /* 向在插入符前的的文本进行正则匹配
         * 考虑会有多个 @ 的存在, 匹配离插入符最近的一个
        */

        subtext = text.slice(0, caret_pos);
        matched = null;
        $.each(this.options, function(flag) {
          var match, regexp;
          regexp = new RegExp(flag + '([A-Za-z0-9_\+\-]*)$|' + flag + '([^\\x00-\\xff]*)$', 'gi');
          match = regexp.exec(subtext);
          if (!_isNil(match)) {
            matched = match[2] ? match[2] : match[1];
            _this.theflag = flag;
            return false;
          }
        });
        if (typeof matched === 'string' && matched.length <= 20) {
          start = caret_pos - matched.length;
          end = start + matched.length;
          this.pos = start;
          key = {
            'text': matched.toLowerCase(),
            'start': start,
            'end': end
          };
        } else {
          this.view.hide();
        }
        keyname = key;
        log("At.getKeyname", key);
        return this.query = key;
      },
      replaceStr: function(str) {
        var $inputor, flag_len, key, source, start_str, text;
        $inputor = this.$inputor;
        key = this.query;
        source = $inputor.val();
        flag_len = this.getOpt("display_flag") ? 0 : this.theflag.length;
        start_str = source.slice(0, key.start - flag_len);
        text = start_str + str + source.slice(key.end);
        $inputor.val(text);
        $inputor.caretPos(start_str.length + str.length);
        $inputor.change();
        return log("At.replaceStr", text);
      },
      onkeydown: function(e) {
        var view;
        view = this.view;
        if (!view.isShowing()) {
          return;
        }
        switch (e.keyCode) {
          case 38:
            e.preventDefault();
            view.prev();
            break;
          case 40:
            e.preventDefault();
            view.next();
            break;
          case 9:
          case 13:
            if (!view.isShowing()) {
              return;
            }
            e.preventDefault();
            view.choose();
            break;
          default:
            $.noop();
        }
        return e.stopPropagation();
      },
      renderView: function(datas) {
        log("At.renderView", this, datas);
        datas = datas.splice(0, this.getOpt('limit'));
        datas = _unique(datas, this.dataValue());
        datas = _objectify(datas);
        datas = _sorter.call(this, datas);
        return this.view.render(this, datas);
      },
      lookup: function() {
        var callback, datas, key;
        key = this.getKeyname();
        if (!key) {
          return false;
        }
        log("At.lookup.key", key);
        if (!_isNil(datas = this.cache())) {
          this.renderView(datas);
        } else if (!_isNil(datas = this.lookupWithData(key))) {
          this.renderView(datas);
        } else if ($.isFunction(callback = this.getOpt('callback'))) {
          callback(key.text, $.proxy(this.renderView, this));
        } else {
          this.view.hide();
        }
        return $.noop();
      },
      lookupWithData: function(key) {
        var data, items,
          _this = this;
        data = this.getOpt("data");
        if ($.isArray(data) && data.length !== 0) {
          items = $.map(data, function(item, i) {
            var match, name, regexp;
            try {
              name = $.isPlainObject(item) ? item[_this.dataValue()] : item;
              regexp = new RegExp(key.text.replace("+", "\\+"), 'i');
              match = name.match(regexp);
            } catch (e) {
              return null;
            }
            if (match) {
              return item;
            } else {
              return null;
            }
          });
        }
        return items;
      }
    };
    AtView = {
      timeout_id: null,
      id: '#at-view',
      holder: null,
      _jqo: null,
      jqo: function() {
        var jqo;
        jqo = this._jqo;
        return jqo = _isNil(jqo) ? (this._jqo = $(this.id)) : jqo;
      },
      init: function() {
        var $menu, tpl,
          _this = this;
        if (!_isNil(this.jqo())) {
          return;
        }
        tpl = "<div id='" + this.id.slice(1) + "' class='at-view'><ul id='" + this.id.slice(1) + "-ul'></ul></div>";
        $("body").append(tpl);
        $menu = this.jqo().find('ul');
        return $menu.on('mouseenter.view', 'li', function(e) {
          $menu.find('.cur').removeClass('cur');
          return $(e.currentTarget).addClass('cur');
        }).on('click', function(e) {
          e.stopPropagation();
          e.preventDefault();
          return _this.choose();
        });
      },
      isShowing: function() {
        return this.jqo().is(":visible");
      },
      choose: function() {
        var $li, str;
        $li = this.jqo().find(".cur");
        str = _isNil($li) ? this.holder.query.text + " " : $li.attr(this.holder.getOpt("input")) + " ";
        this.holder.replaceStr(str);
        return this.hide();
      },
      rePosition: function() {
        var rect;
        rect = this.holder.rect();
        if (rect.bottom + this.jqo().height() - $(window).scrollTop() > $(window).height()) {
          rect.bottom = rect.top - this.jqo().height();
        }
        log("AtView.rePosition", {
          left: rect.left,
          top: rect.bottom
        });
        return this.jqo().offset({
          left: rect.left,
          top: rect.bottom
        });
      },
      next: function() {
        var cur, next;
        cur = this.jqo().find('.cur').removeClass('cur');
        next = cur.next();
        if (!next.length) {
          next = $(this.jqo().find('li')[0]);
        }
        return next.addClass('cur');
      },
      prev: function() {
        var cur, prev;
        cur = this.jqo().find('.cur').removeClass('cur');
        prev = cur.prev();
        if (!prev.length) {
          prev = this.jqo().find('li').last();
        }
        return prev.addClass('cur');
      },
      show: function() {
        if (!this.isShowing()) {
          this.jqo().show();
        }
        return this.rePosition();
      },
      hide: function(time) {
        var callback,
          _this = this;
        if (isNaN(time)) {
          if (this.isShowing()) {
            return this.jqo().hide();
          }
        } else {
          callback = function() {
            return _this.hide();
          };
          clearTimeout(this.timeout_id);
          return this.timeout_id = setTimeout(callback, 300);
        }
      },
      clear: function(clear_all) {
        if (clear_all === true) {
          this._cache = {};
        }
        return this.jqo().find('ul').empty();
      },
      render: function(holder, list) {
        var $ul, tpl;
        if (!$.isArray(list)) {
          return false;
        }
        if (list.length <= 0) {
          this.hide();
          return true;
        }
        this.holder = holder;
        holder.cache(list);
        this.clear();
        $ul = this.jqo().find('ul');
        tpl = holder.getOpt('tpl');
        $.each(list, function(i, item) {
          var li;
          tpl || (tpl = _DEFAULT_TPL);
          li = _evalTpl(tpl, item);
          log("AtView.render", li);
          return $ul.append(_highlighter(li, holder.query.text));
        });
        this.show();
        return $ul.find("li:eq(0)").addClass("cur");
      }
    };
    _objectify = function(list) {
      return $.map(list, function(item, k) {
        if (!$.isPlainObject(item)) {
          item = {
            id: k,
            name: item
          };
        }
        return item;
      });
    };
    _evalTpl = function(tpl, map) {
      var el;
      try {
        return el = tpl.replace(/\$\{([^\}]*)\}/g, function(tag, key, pos) {
          return map[key];
        });
      } catch (error) {
        return "";
      }
    };
    _highlighter = function(li, query) {
      if (_isNil(query)) {
        return li;
      }
      return li.replace(new RegExp(">\\s*(\\w*)(" + query.replace("+", "\\+") + ")(\\w*)\\s*<", 'ig'), function(str, $1, $2, $3) {
        return '> ' + $1 + '<strong>' + $2 + '</strong>' + $3 + ' <';
      });
    };
    _sorter = function(items) {
      var data_value, item, query, results, text, _i, _len;
      data_value = this.dataValue();
      query = this.query.text;
      results = [];
      for (_i = 0, _len = items.length; _i < _len; _i++) {
        item = items[_i];
        text = item[data_value];
        if (text.toLowerCase().indexOf(query) === -1) {
          continue;
        }
        item.order = text.toLowerCase().indexOf(query);
        results.push(item);
      }
      results.sort(function(a, b) {
        return a.order - b.order;
      });
      return results;
    };
    /*
          maybe we can use $._unique.
          But i don't know it will delete li element frequently or not.
          I think we should not change DOM element frequently.
          more, It seems batter not to call evalTpl function too much times.
    */

    _unique = function(list, query) {
      var record;
      record = [];
      return $.map(list, function(v, id) {
        var value;
        value = $.isPlainObject(v) ? v[query] : v;
        if ($.inArray(value, record) < 0) {
          record.push(value);
          return v;
        }
      });
    };
    _isNil = function(target) {
      return !target || ($.isPlainObject(target) && $.isEmptyObject(target)) || ($.isArray(target) && target.length === 0) || (target instanceof $ && target.length === 0) || target === void 0;
    };
    _DEFAULT_TPL = "<li id='${id}' data-value='${name}'>${name}</li>";
    log = function() {};
    $.fn.atWho = function(flag, options) {
      AtView.init();
      return this.filter('textarea, input').each(function() {
        var $this, data;
        $this = $(this);
        data = $this.data("AtWho");
        if (!data) {
          $this.data('AtWho', (data = new At(this)));
        }
        return data.reg(flag, options);
      });
    };
    return $.fn.atWho["default"] = {
      data: [],
      choose: "data-value",
      input:"input-value",
      callback: null,
      cache: true,
      limit: 10,
      display_flag: true,
      tpl: _DEFAULT_TPL
    };
  })(window.jQuery);

}).call(this);
