isc.defineClass("GeRestDataSource", "RestDataSource");

isc.GeRestDataSource.addProperties({
    dataFormat: "json",
    dataUrlPrefix: null,
    sendMetaData: true,
    fieldsOnly: false,

    // Additionally supply meta data to the transformed request
    transformRequest : function (dsRequest) {
        var transformedRequest = this.Super("transformRequest", arguments);
        if (this.sendMetaData) {
            if (this.fieldsOnly) {
                var fieldNames = [];
                for (var field in this.fields) {
                    fieldNames.push(field);
                }
                if (fieldNames.length > 0) {
                    transformedRequest[this.metaDataPrefix + "fieldsOnly"] = this.fieldsOnly;
                    transformedRequest[this.metaDataPrefix + "fields"] = fieldNames;
                }
            }
        }
        return transformedRequest;
    },

    // Additionally supply warnings to the transformed response
    transformResponse : function (dsResponse, dsRequest, data) {
        var transformedResponse = this.Super("transformResponse", arguments);
        transformedResponse.warnings = [];
        var warnings;
        if (this.dataFormat == "json") {
            var rawResponse = data.response || {};
            warnings = rawResponse.warnings;
        } else {
            warnings = isc.xml.toJS(data.selectNodes("//warnings"));
        }
        if (isc.isAn.Array(warnings)) {
            for (var i = 0; i < warnings.length; i++) {
                transformedResponse.warnings[i] = warnings[i];
            }
        }
        return transformedResponse;
    },

    // Build data URLs automatically if a data URL prefix has been supplied
    getDataURL : function (dsRequest) {
        if (isc.isA.String(this.dataUrlPrefix)) {
            var type = dsRequest.operationType;
            var dataUrl = null;
            var dataUrlPrefix = this.dataUrlPrefix;
            if (!dataUrlPrefix.endsWith("/")) {
                dataUrlPrefix += "/";
            }
            if (type == "fetch") {
                dataUrl = this.fetchDataURL;
                if (!isc.isA.String(dataUrl)) {
                    dataUrl = dataUrlPrefix + "/" + type + "." + this.dataFormat;
                }
            } else if (type == "update") {
                dataUrl = this.updateDataURL;
                if (!isc.isA.String(dataUrl)) {
                    dataUrl = dataUrlPrefix + "/" + type + "." + this.dataFormat;
                }
            } else if (type == "add") {
                dataUrl = this.addDataURL;
                if (!isc.isA.String(dataUrl)) {
                    dataUrl = dataUrlPrefix + "/" + type + "." + this.dataFormat;
                }
            } else if (type == "remove") {
                dataUrl = this.removeDataURL;
                if (!isc.isA.String(dataUrl)) {
                    dataUrl = dataUrlPrefix + "/" + type + "." + this.dataFormat;
                }
            }
            if (isc.isA.String(dataUrl)) {
                return dataUrl.replace(/[/]+/g, "/");
            }
        }
        return this.Super("getDataURL", arguments);
   }
});