/*

Copyright (c) 2009, Yahoo! Inc. All rights reserved.

Code licensed under the BSD License:

http://developer.yahoo.net/yui/license.txt

version: 3.0.0b1

build: 1163

*/

YUI.add('dataschema-array', function(Y) {

/**

 * Provides a DataSchema implementation which can be used to work with data stored in arrays.

 *

 * @module dataschema

 * @submodule dataschema-array

 */

/**

 * Array subclass for the DataSchema Utility.

 * @class DataSchema.Array

 * @extends DataSchema.Base

 * @static

 */

var LANG = Y.Lang,

    SchemaArray = {

        /////////////////////////////////////////////////////////////////////////////

        //

        // DataSchema.Array static methods

        //

        /////////////////////////////////////////////////////////////////////////////

        /**

         * Applies a given schema to given Array data.

         *

         * @method apply

         * @param schema {Object} Schema to apply.

         * @param data {Object} Array data.

         * @return {Object} Schema-parsed data.

         * @static

         */

        apply: function(schema, data) {

            var data_in = data,

                data_out = {results:[],meta:{}};

            if(LANG.isArray(data_in)) {

                if(LANG.isArray(schema.resultFields)) {

                    // Parse results data

                    data_out = SchemaArray._parseResults(schema.resultFields, data_in, data_out);

                }

                else {

                    data_out.results = data_in;

                }

            }

            else {

                data_out.error = new Error("Array schema parse failure");

            }

            return data_out;

        },

        /**

         * Schema-parsed list of results from full data

         *

         * @method _parseResults

         * @param fields {Array} Schema to parse against.

         * @param array_in {Array} Array to parse.

         * @param data_out {Object} In-progress parsed data to update.

         * @return {Object} Parsed data object.

         * @static

         * @protected

         */

        _parseResults: function(fields, array_in, data_out) {

            var results = [],

                result, item, type, field, key, value, i, j;

            for(i=array_in.length-1; i>-1; i--) {

                result = {};

                item = array_in[i];

                type = (LANG.isObject(item) && !LANG.isFunction(item)) ? 2 : (LANG.isArray(item)) ? 1 : (LANG.isString(item)) ? 0 : -1;

                if(type > 0) {

                    for(j=fields.length-1; j>-1; j--) {

                        field = fields[j];

                        key = (!LANG.isUndefined(field.key)) ? field.key : field;

                        value = (!LANG.isUndefined(item[key])) ? item[key] : item[j];

                        result[key] = Y.DataSchema.Base.parse(value, field);

                    }

                }

                else if(type === 0) {

                    result = item;

                }

                else {

                    //TODO: null or {}?

                    result = null;

                }

                results[i] = result;

            }

            data_out.results = results;

            return data_out;

        }

    };

Y.DataSchema.Array = Y.mix(SchemaArray, Y.DataSchema.Base);

}, '3.0.0b1' ,{requires:['dataschema-base']});