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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.marmotta.ldpath.template.engine;

import freemarker.core.Environment;
import freemarker.template.*;
import org.apache.marmotta.ldpath.template.model.freemarker.TemplateWrapperModel;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;

/**
 * Add file description here!
 * 
 * Author: Sebastian Schaffert
 */
public class NamespaceDirective implements TemplateDirectiveModel {


    public NamespaceDirective() {
    }

    /**
     * Executes this user-defined directive; called by FreeMarker when the user-defined
     * directive is called in the template.
     *
     * @param env      the current processing environment. Note that you can access
     *                 the output {@link java.io.Writer Writer} by {@link freemarker.core.Environment#getOut()}.
     * @param params   the parameters (if any) passed to the directive as a
     *                 map of key/value pairs where the keys are {@link String}-s and the
     *                 values are {@link freemarker.template.TemplateModel} instances. This is never
     *                 null. If you need to convert the template models to POJOs,
     *                 you can use the utility methods in the {@link freemarker.template.utility.DeepUnwrap} class.
     * @param loopVars an array that corresponds to the "loop variables", in
     *                 the order as they appear in the directive call. ("Loop variables" are out-parameters
     *                 that are available to the nested body of the directive; see in the Manual.)
     *                 You set the loop variables by writing this array. The length of the array gives the
     *                 number of loop-variables that the caller has specified.
     *                 Never null, but can be a zero-length array.
     * @param body     an object that can be used to render the nested content (body) of
     *                 the directive call. If the directive call has no nested content (i.e., it is like
     *                 [@myDirective /] or [@myDirective][/@myDirective]), then this will be
     *                 null.
     * @throws freemarker.template.TemplateException
     *
     * @throws java.io.IOException
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) throws TemplateException, IOException {
        TemplateWrapperModel> namespacesWrapped = (TemplateWrapperModel>)env.getGlobalVariable("namespaces");

        Map namespaces;
        if(namespacesWrapped == null) {
            namespaces = new HashMap<>();
            namespacesWrapped = new TemplateWrapperModel<>(namespaces);
            env.setGlobalVariable("namespaces",namespacesWrapped);
        } else {
            namespaces = namespacesWrapped.getAdaptedObject(Map.class);
        }


        for (Object o : params.entrySet()) {
            Map.Entry ent = (Map.Entry) o;

            String paramName = (String) ent.getKey();
            TemplateModel paramValue = (TemplateModel) ent.getValue();

            if (paramValue instanceof TemplateScalarModel) {
                String uri = ((TemplateScalarModel) paramValue).getAsString();

                try {
                    URI test = new URI(uri);
                    namespaces.put(paramName, test.toString());
                } catch (URISyntaxException e) {
                    throw new TemplateModelException("invalid namespace URI '" + uri + "'", e);
                }
            }
        }

    }
}