(function() {
  'use strict';
  // CONSTANTS
  var GET = 'get',
    SET = 'set';

  Konva.Factory = {
    addGetterSetter: function(constructor, attr, def, validator, after) {
      this.addGetter(constructor, attr, def);
      this.addSetter(constructor, attr, validator, after);
      this.addOverloadedGetterSetter(constructor, attr);
    },
    addGetter: function(constructor, attr, def) {
      var method = GET + Konva.Util._capitalize(attr);

      constructor.prototype[method] = function() {
        var val = this.attrs[attr];
        return val === undefined ? def : val;
      };
    },
    addSetter: function(constructor, attr, validator, after) {
      var method = SET + Konva.Util._capitalize(attr);

      constructor.prototype[method] = function(val) {
        if (validator) {
          val = validator.call(this, val);
        }

        this._setAttr(attr, val);

        if (after) {
          after.call(this);
        }

        return this;
      };
    },
    addComponentsGetterSetter: function(
      constructor,
      attr,
      components,
      validator,
      after
    ) {
      var len = components.length,
        capitalize = Konva.Util._capitalize,
        getter = GET + capitalize(attr),
        setter = SET + capitalize(attr),
        n,
        component;

      // getter
      constructor.prototype[getter] = function() {
        var ret = {};

        for (n = 0; n < len; n++) {
          component = components[n];
          ret[component] = this.getAttr(attr + capitalize(component));
        }

        return ret;
      };

      // setter
      constructor.prototype[setter] = function(val) {
        var oldVal = this.attrs[attr],
          key;

        if (validator) {
          val = validator.call(this, val);
        }

        for (key in val) {
          if (!val.hasOwnProperty(key)) {
            continue;
          }
          this._setAttr(attr + capitalize(key), val[key]);
        }

        this._fireChangeEvent(attr, oldVal, val);

        if (after) {
          after.call(this);
        }

        return this;
      };

      this.addOverloadedGetterSetter(constructor, attr);
    },
    addOverloadedGetterSetter: function(constructor, attr) {
      var capitalizedAttr = Konva.Util._capitalize(attr),
        setter = SET + capitalizedAttr,
        getter = GET + capitalizedAttr;

      constructor.prototype[attr] = function() {
        // setting
        if (arguments.length) {
          this[setter](arguments[0]);
          return this;
        }
        // getting
        return this[getter]();
      };
    },
    addDeprecatedGetterSetter: function(constructor, attr, def, validator) {
      Konva.Util.error('Adding deprecated ' + attr);

      var method = GET + Konva.Util._capitalize(attr);

      var message =
        attr +
        ' property is deprecated and will be removed soon. Look at Konva change log for more information.';
      constructor.prototype[method] = function() {
        Konva.Util.error(message);
        var val = this.attrs[attr];
        return val === undefined ? def : val;
      };
      this.addSetter(constructor, attr, validator, function() {
        Konva.Util.error(message);
      });
      this.addOverloadedGetterSetter(constructor, attr);
    },
    backCompat: function(constructor, methods) {
      Konva.Util.each(methods, function(oldMethodName, newMethodName) {
        var method = constructor.prototype[newMethodName];
        constructor.prototype[oldMethodName] = function() {
          method.apply(this, arguments);
          Konva.Util.error(
            oldMethodName +
              ' method is deprecated and will be removed soon. Use ' +
              newMethodName +
              ' instead'
          );
        };
      });
    },
    afterSetFilter: function() {
      this._filterUpToDate = false;
    }
  };

  Konva.Validators = {
    /**
     * @return {number}
     */
    RGBComponent: function(val) {
      if (val > 255) {
        return 255;
      } else if (val < 0) {
        return 0;
      }
      return Math.round(val);
    },
    alphaComponent: function(val) {
      if (val > 1) {
        return 1;
      } else if (val < 0.0001) {
        // chrome does not honor alpha values of 0
        return 0.0001;
      }

      return val;
    }
  };
})();