/*

YUI 3.10.3 (build 2fb5187)

Copyright 2013 Yahoo! Inc. All rights reserved.

Licensed under the BSD License.

http://yuilibrary.com/license/

*/

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

/**

 * Provides a DataSchema implementation which can be used to work with data

 * stored in arrays.

 *

 * @module dataschema

 * @submodule dataschema-array

 */

/**

Provides a DataSchema implementation which can be used to work with data

stored in arrays.

See the `apply` method below for usage.

@class DataSchema.Array

@extends DataSchema.Base

@static

**/

var LANG = Y.Lang,

    SchemaArray = {

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

        //

        // DataSchema.Array static methods

        //

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

        /**

        Applies a schema to an array of data, returning a normalized object

        with results in the `results` property. The `meta` property of the

        response object is present for consistency, but is assigned an empty

        object.  If the input data is absent or not an array, an `error`

        property will be added.

        The input array is expected to contain objects, arrays, or strings.

        If _schema_ is not specified or _schema.resultFields_ is not an array,

        `response.results` will be assigned the input array unchanged.

        When a _schema_ is specified, the following will occur:

        If the input array contains strings, they will be copied as-is into the

        `response.results` array.

        If the input array contains arrays, `response.results` will contain an

        array of objects with key:value pairs assuming the fields in

        _schema.resultFields_ are ordered in accordance with the data array

        values.

        If the input array contains objects, the identified

        _schema.resultFields_ will be used to extract a value from those

        objects for the output result.

        _schema.resultFields_ field identifiers are objects with the following properties:

          * `key`   : <strong>(required)</strong> The locator name (String)

          * `parser`: A function or the name of a function on `Y.Parsers` used

                to convert the input value into a normalized type.  Parser

                functions are passed the value as input and are expected to

                return a value.

        If no value parsing is needed, you can use strings as identifiers

        instead of objects (see example below).

        @example

            // Process array of arrays

            var schema = { resultFields: [ 'fruit', 'color' ] },

                data = [

                    [ 'Banana', 'yellow' ],

                    [ 'Orange', 'orange' ],

                    [ 'Eggplant', 'purple' ]

                ];

            var response = Y.DataSchema.Array.apply(schema, data);

            // response.results[0] is { fruit: "Banana", color: "yellow" }

            // Process array of objects

            data = [

                { fruit: 'Banana', color: 'yellow', price: '1.96' },

                { fruit: 'Orange', color: 'orange', price: '2.04' },

                { fruit: 'Eggplant', color: 'purple', price: '4.31' }

            ];

            response = Y.DataSchema.Array.apply(schema, data);

            // response.results[0] is { fruit: "Banana", color: "yellow" }

            // Use parsers

            schema.resultFields = [

                {

                    key: 'fruit',

                    parser: function (val) { return val.toUpperCase(); }

                },

                {

                    key: 'price',

                    parser: 'number' // Uses Y.Parsers.number

                }

            ];

            response = Y.DataSchema.Array.apply(schema, data);

            // Note price was converted from a numeric string to a number

            // response.results[0] looks like { fruit: "BANANA", price: 1.96 }

        @method apply

        @param {Object} [schema] Schema to apply.  Supported configuration

            properties are:

          @param {Array} [schema.resultFields] Field identifiers to

              locate/assign values in the response records. See above for

              details.

        @param {Array} data Array data.

        @return {Object} An Object with properties `results` and `meta`

        @static

        **/

        apply: function(schema, data) {

            var data_in = data,

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

            if(LANG.isArray(data_in)) {

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

                    // Parse results data

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

                }

                else {

                    data_out.results = data_in;

                    Y.log("Schema resultFields property not found: " + Y.dump(schema), "warn", "dataschema-array");

                }

            }

            else {

                Y.log("Array data could not be schema-parsed: " + Y.dump(data) + " " + Y.dump(data), "error", "dataschema-array");

                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.call(this, value, field);

                    }

                }

                else if(type === 0) {

                    result = item;

                }

                else {

                    //TODO: null or {}?

                    result = null;

                    Y.log("Unexpected type while parsing array: " + Y.dump(item), "warn", "dataschema-array");

                }

                results[i] = result;

            }

            data_out.results = results;

            return data_out;

        }

    };

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

}, '3.10.3', {"requires": ["dataschema-base"]});