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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.vendorsoftwareproduct.services.schemagenerator;

import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;
import org.openecomp.sdc.vendorsoftwareproduct.types.composition.CompositionEntityType;
import org.openecomp.sdc.vendorsoftwareproduct.types.schemagenerator.SchemaTemplateContext;
import org.openecomp.sdc.vendorsoftwareproduct.types.schemagenerator.SchemaTemplateInput;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;

public class SchemaGenerator {
  public static final String SCHEMA_GENERATION_ERROR = "SCHEMA_GENERATION_ERROR";

  /**
   * Generate string.
   *
   * @param schemaTemplateContext the schema template context
   * @param entityType            the entity type
   * @param input                 the input
   * @return the string
   */
  public static String generate(SchemaTemplateContext schemaTemplateContext,
                                CompositionEntityType entityType, SchemaTemplateInput input) {
    Template schemaTemplate =
        SchemaGeneratorConfig.getSchemaTemplate(schemaTemplateContext, entityType);
    return processTemplate(input, schemaTemplate);
  }

  private static String processTemplate(SchemaTemplateInput input, Template schemaTemplate) {
    try (Writer writer = new StringWriter(1024)) {
      schemaTemplate.process(input, writer);
      return writer.toString();
    } catch (IOException | TemplateException exception) {
      throw new CoreException(
          new ErrorCode.ErrorCodeBuilder().withCategory(ErrorCategory.APPLICATION)
              .withId(SCHEMA_GENERATION_ERROR).withMessage(exception.getMessage()).build());
    }
  }
}