text: import { get } from "ember-metal/property_get";
  import run from "ember-metal/run_loop";
  import { dasherize } from "ember-runtime/system/string";
  import Namespace from "ember-runtime/system/namespace";
  import EmberObject from "ember-runtime/system/object";
  import { A as emberA } from "ember-runtime/system/native_array";
  import Application from "ember-application/system/application";
  
  /**
  @module ember
  @submodule ember-extension-support
  */
  
  /**
    The `DataAdapter` helps a data persistence library
    interface with tools that debug Ember such
    as the [Ember Extension](https://github.com/tildeio/ember-extension)
    for Chrome and Firefox.
  
    This class will be extended by a persistence library
    which will override some of the methods with
    library-specific code.
  
    The methods likely to be overridden are:
  
    * `getFilters`
    * `detect`
    * `columnsForType`
    * `getRecords`
    * `getRecordColumnValues`
    * `getRecordKeywords`
    * `getRecordFilterValues`
    * `getRecordColor`
    * `observeRecord`
  
    The adapter will need to be registered
    in the application's container as `dataAdapter:main`
  
    Example:
  
    ```javascript
    Application.initializer({
      name: "data-adapter",
  
      initialize: function(container, application) {
        application.register('data-adapter:main', DS.DataAdapter);
      }
    });
    ```
  
    @class DataAdapter
    @namespace Ember
    @extends EmberObject
  */
  export default EmberObject.extend({
    init: function() {
      this._super();
      this.releaseMethods = emberA();
    },
  
    /**
      The container of the application being debugged.
      This property will be injected
      on creation.
  
      @property container
      @default null
      @since 1.3.0
    */
    container: null,
  
  
    /**
      The container-debug-adapter which is used
      to list all models.
  
      @property containerDebugAdapter
      @default undefined
      @since 1.5.0
    **/
    containerDebugAdapter: undefined,
  
    /**
      Number of attributes to send
      as columns. (Enough to make the record
      identifiable).
  
      @private
      @property attributeLimit
      @default 3
      @since 1.3.0
    */
    attributeLimit: 3,
  
    /**
      Stores all methods that clear observers.
      These methods will be called on destruction.
  
      @private
      @property releaseMethods
      @since 1.3.0
    */
    releaseMethods: emberA(),
  
    /**
      Specifies how records can be filtered.
      Records returned will need to have a `filterValues`
      property with a key for every name in the returned array.
  
      @public
      @method getFilters
      @return {Array} List of objects defining filters.
       The object should have a `name` and `desc` property.
    */
    getFilters: function() {
      return emberA();
    },
  
    /**
      Fetch the model types and observe them for changes.
  
      @public
      @method watchModelTypes
  
      @param {Function} typesAdded Callback to call to add types.
      Takes an array of objects containing wrapped types (returned from `wrapModelType`).
  
      @param {Function} typesUpdated Callback to call when a type has changed.
      Takes an array of objects containing wrapped types.
  
      @return {Function} Method to call to remove all observers
    */
    watchModelTypes: function(typesAdded, typesUpdated) {
      var modelTypes = this.getModelTypes();
      var self = this;
      var releaseMethods = emberA();
      var typesToSend;
  
      typesToSend = modelTypes.map(function(type) {
        var klass = type.klass;
        var wrapped = self.wrapModelType(klass, type.name);
        releaseMethods.push(self.observeModelType(klass, typesUpdated));
        return wrapped;
      });
  
      typesAdded(typesToSend);
  
      var release = function() {
        releaseMethods.forEach(function(fn) { fn(); });
        self.releaseMethods.removeObject(release);
      };
      this.releaseMethods.pushObject(release);
      return release;
    },
  
    _nameToClass: function(type) {
      if (typeof type === 'string') {
        type = this.container.lookupFactory('model:' + type);
      }
      return type;
    },
  
    /**
      Fetch the records of a given type and observe them for changes.
  
      @public
      @method watchRecords
  
      @param {Function} recordsAdded Callback to call to add records.
      Takes an array of objects containing wrapped records.
      The object should have the following properties:
        columnValues: {Object} key and value of a table cell
        object: {Object} the actual record object
  
      @param {Function} recordsUpdated Callback to call when a record has changed.
      Takes an array of objects containing wrapped records.
  
      @param {Function} recordsRemoved Callback to call when a record has removed.
      Takes the following parameters:
        index: the array index where the records were removed
        count: the number of records removed
  
      @return {Function} Method to call to remove all observers
    */
    watchRecords: function(type, recordsAdded, recordsUpdated, recordsRemoved) {
      var self = this, releaseMethods = emberA(), records = this.getRecords(type), release;
  
      var recordUpdated = function(updatedRecord) {
        recordsUpdated([updatedRecord]);
      };
  
      var recordsToSend = records.map(function(record) {
        releaseMethods.push(self.observeRecord(record, recordUpdated));
        return self.wrapRecord(record);
      });
  
  
      var contentDidChange = function(array, idx, removedCount, addedCount) {
        for (var i = idx; i < idx + addedCount; i++) {
          var record = array.objectAt(i);
          var wrapped = self.wrapRecord(record);
          releaseMethods.push(self.observeRecord(record, recordUpdated));
          recordsAdded([wrapped]);
        }
  
        if (removedCount) {
          recordsRemoved(idx, removedCount);
        }
      };
  
      var observer = { didChange: contentDidChange, willChange: function() { return this; } };
      records.addArrayObserver(self, observer);
  
      release = function() {
        releaseMethods.forEach(function(fn) { fn(); });
        records.removeArrayObserver(self, observer);
        self.releaseMethods.removeObject(release);
      };
  
      recordsAdded(recordsToSend);
  
      this.releaseMethods.pushObject(release);
      return release;
    },
  
    /**
      Clear all observers before destruction
      @private
      @method willDestroy
    */
    willDestroy: function() {
      this._super();
      this.releaseMethods.forEach(function(fn) {
        fn();
      });
    },
  
    /**
      Detect whether a class is a model.
  
      Test that against the model class
      of your persistence library
  
      @private
      @method detect
      @param {Class} klass The class to test
      @return boolean Whether the class is a model class or not
    */
    detect: function(klass) {
      return false;
    },
  
    /**
      Get the columns for a given model type.
  
      @private
      @method columnsForType
      @param {Class} type The model type
      @return {Array} An array of columns of the following format:
       name: {String} name of the column
       desc: {String} Humanized description (what would show in a table column name)
    */
    columnsForType: function(type) {
      return emberA();
    },
  
    /**
      Adds observers to a model type class.
  
      @private
      @method observeModelType
      @param {Class} type The model type class
      @param {Function} typesUpdated Called when a type is modified.
      @return {Function} The function to call to remove observers
    */
  
    observeModelType: function(type, typesUpdated) {
      var self = this;
      var records = this.getRecords(type);
  
      var onChange = function() {
        typesUpdated([self.wrapModelType(type)]);
      };
      var observer = {
        didChange: function() {
          run.scheduleOnce('actions', this, onChange);
        },
        willChange: function() { return this; }
      };
  
      records.addArrayObserver(this, observer);
  
      var release = function() {
        records.removeArrayObserver(self, observer);
      };
  
      return release;
    },
  
  
    /**
      Wraps a given model type and observes changes to it.
  
      @private
      @method wrapModelType
      @param {Class} type A model class
      @param {String}  Optional name of the class
      @return {Object} contains the wrapped type and the function to remove observers
      Format:
        type: {Object} the wrapped type
          The wrapped type has the following format:
            name: {String} name of the type
            count: {Integer} number of records available
            columns: {Columns} array of columns to describe the record
            object: {Class} the actual Model type class
        release: {Function} The function to remove observers
    */
    wrapModelType: function(type, name) {
      var records = this.getRecords(type);
      var typeToSend;
  
      typeToSend = {
        name: name || type.toString(),
        count: get(records, 'length'),
        columns: this.columnsForType(type),
        object: type
      };
  
  
      return typeToSend;
    },
  
  
    /**
      Fetches all models defined in the application.
  
      @private
      @method getModelTypes
      @return {Array} Array of model types
    */
    getModelTypes: function() {
      var self = this;
      var containerDebugAdapter = this.get('containerDebugAdapter');
      var types;
  
      if (containerDebugAdapter.canCatalogEntriesByType('model')) {
        types = containerDebugAdapter.catalogEntriesByType('model');
      } else {
        types = this._getObjectsOnNamespaces();
      }
  
      // New adapters return strings instead of classes
      types = emberA(types).map(function(name) {
        return {
          klass: self._nameToClass(name),
          name: name
        };
      });
      types = emberA(types).filter(function(type) {
        return self.detect(type.klass);
      });
  
      return emberA(types);
    },
  
    /**
      Loops over all namespaces and all objects
      attached to them
  
      @private
      @method _getObjectsOnNamespaces
      @return {Array} Array of model type strings
    */
    _getObjectsOnNamespaces: function() {
      var namespaces = emberA(Namespace.NAMESPACES);
      var types = emberA();
      var self = this;
  
      namespaces.forEach(function(namespace) {
        for (var key in namespace) {
          if (!namespace.hasOwnProperty(key)) { continue; }
          // Even though we will filter again in `getModelTypes`,
          // we should not call `lookupContainer` on non-models
          // (especially when `Ember.MODEL_FACTORY_INJECTIONS` is `true`)
          if (!self.detect(namespace[key])) { continue; }
          var name = dasherize(key);
          if (!(namespace instanceof Application) && namespace.toString()) {
            name = namespace + '/' + name;
          }
          types.push(name);
        }
      });
      return types;
    },
  
    /**
      Fetches all loaded records for a given type.
  
      @private
      @method getRecords
      @return {Array} An array of records.
       This array will be observed for changes,
       so it should update when new records are added/removed.
    */
    getRecords: function(type) {
      return emberA();
    },
  
    /**
      Wraps a record and observers changes to it.
  
      @private
      @method wrapRecord
      @param {Object} record The record instance.
      @return {Object} The wrapped record. Format:
      columnValues: {Array}
      searchKeywords: {Array}
    */
    wrapRecord: function(record) {
      var recordToSend = { object: record };
  
      recordToSend.columnValues = this.getRecordColumnValues(record);
      recordToSend.searchKeywords = this.getRecordKeywords(record);
      recordToSend.filterValues = this.getRecordFilterValues(record);
      recordToSend.color = this.getRecordColor(record);
  
      return recordToSend;
    },
  
    /**
      Gets the values for each column.
  
      @private
      @method getRecordColumnValues
      @return {Object} Keys should match column names defined
      by the model type.
    */
    getRecordColumnValues: function(record) {
      return {};
    },
  
    /**
      Returns keywords to match when searching records.
  
      @private
      @method getRecordKeywords
      @return {Array} Relevant keywords for search.
    */
    getRecordKeywords: function(record) {
      return emberA();
    },
  
    /**
      Returns the values of filters defined by `getFilters`.
  
      @private
      @method getRecordFilterValues
      @param {Object} record The record instance
      @return {Object} The filter values
    */
    getRecordFilterValues: function(record) {
      return {};
    },
  
    /**
      Each record can have a color that represents its state.
  
      @private
      @method getRecordColor
      @param {Object} record The record instance
      @return {String} The record's color
        Possible options: black, red, blue, green
    */
    getRecordColor: function(record) {
      return null;
    },
  
    /**
      Observes all relevant properties and re-sends the wrapped record
      when a change occurs.
  
      @private
      @method observerRecord
      @param {Object} record The record instance
      @param {Function} recordUpdated The callback to call when a record is updated.
      @return {Function} The function to call to remove all observers.
    */
    observeRecord: function(record, recordUpdated) {
      return function(){};
    }
  });
  