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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 io.kestros.commons.structuredslingmodels.utils;

import static io.kestros.commons.structuredslingmodels.utils.SlingModelUtils.adaptTo;
import static io.kestros.commons.structuredslingmodels.utils.SlingModelUtils.adaptToBaseResource;
import static io.kestros.commons.structuredslingmodels.utils.SlingModelUtils.getChildAsBaseResource;
import static io.kestros.commons.structuredslingmodels.utils.SlingModelUtils.getResourceAsBaseResource;

import io.kestros.commons.structuredslingmodels.BaseResource;
import io.kestros.commons.structuredslingmodels.exceptions.ChildResourceNotFoundException;
import io.kestros.commons.structuredslingmodels.exceptions.InvalidResourceTypeException;
import io.kestros.commons.structuredslingmodels.exceptions.ResourceNotFoundException;
import io.kestros.commons.structuredslingmodels.filetypes.BaseFile;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;

/**
 * Utility methods for retrieving nt:file Resources as Sling Models (which extend {@link
 * BaseFile}).
 */
public class FileModelUtils {

  private FileModelUtils() {
  }

  /**
   * Adapts a BaseResource to a specified Model type that extends BaseFile.  Adapted object must
   * pass validation ( no errors ).
   *
   * @param fileResource Resource to adapt.
   * @param type Model type to adapt the resource to. Must extend BaseFile.
   * @param  Model type to adapt the resource to. Must extend BaseFile.
   * @return The Resource adapted to the specified FileType.
   * @throws InvalidResourceTypeException Thrown when the Resource cannot be adapted to the
   *     passed type, or has an error after adaption.
   */
  public static  T adaptToFileType(final BaseResource fileResource,
      final Class type) throws InvalidResourceTypeException {
    T file = adaptTo(fileResource, type);
    if (!file.getErrorMessages().isEmpty()) {
      throw new InvalidResourceTypeException(fileResource.getPath(), type,
          "Failed validation checks. " + file.getErrorMessages());
    } else if (!file.getFileType().getReadableContentTypes().contains(file.getMimeType())) {
      file = fileResource.getResource().adaptTo(type);
      if (file != null) {
        throw new InvalidResourceTypeException(fileResource.getPath(), type,
            String.format("File mimeType '%s' did not match any expected types.",
                file.getMimeType()));
      } else {
        throw new InvalidResourceTypeException(fileResource.getPath(), type);
      }
    }
    return file;
  }

  /**
   * Adapts a Resource to a specified Model type that extends BaseFile.  Adapted object must pass
   * validation ( no errors ).
   *
   * @param fileResource Resource to adapt.
   * @param type Model type to adapt the resource to. Must extend BaseFile.
   * @param  Model type to adapt the resource to. Must extend BaseFile.
   * @return The Resource adapted to the specified FileType.
   * @throws InvalidResourceTypeException Thrown when the Resource cannot be adapted to the
   *     passed type, or has an error after adaption.
   */
  public static  T adaptToFileType(final Resource fileResource,
      final Class type) throws InvalidResourceTypeException {
    return adaptToFileType(adaptToBaseResource(fileResource), type);
  }

  /**
   * Retrieves the specified Resource, adapted to the BaseFile implementation type (if possible).
   *
   * @param path Absolute path to the Resource to retrieve.
   * @param resolver ResourceResolver.
   * @param type Model type to adapt the resource to. Must extend BaseFile.
   * @param  Extends {@link BaseFile}
   * @return the specified Resource, adapted to the BaseFile implementation type.
   * @throws ResourceNotFoundException No Resource found at the specified path.
   * @throws InvalidResourceTypeException Resource was found at the specified path, but could
   *     not be adapted to the expected BaseFile implementation Model type.
   */
  public static  T getResourceAsFileType(final String path,
      final ResourceResolver resolver, final Class type)
      throws ResourceNotFoundException, InvalidResourceTypeException {
    return adaptToFileType(getResourceAsBaseResource(path, resolver), type);
  }

  /**
   * Retrieves a child Resource as the specified BaseFile implementation Model.
   *
   * @param name Name of expected child Resource
   * @param resource Resource to retrieve child of.
   * @param type Sling Model type to adapt to.
   * @param  Extends {@link BaseFile}
   * @return The child Resource as the specified BaseFile implementation Model.
   * @throws ChildResourceNotFoundException No child resource matching the specified name was
   *     found.
   * @throws InvalidResourceTypeException The specified child Resource was found, but could not
   *     be adapted to the expected BaseFile implementation Model. Most likely caused by an invalid
   *     jcr:mimeType value.
   */
  public static  T getChildAsFileType(final String name,
      final Resource resource, final Class type)
      throws ChildResourceNotFoundException, InvalidResourceTypeException {
    return adaptToFileType(getChildAsBaseResource(name, resource), type);
  }

  /**
   * Retrieves a child Resource as the specified BaseFile implementation Model.
   *
   * @param name Name of expected child Resource
   * @param baseResource Resource to retrieve child of.
   * @param type Sling Model type to adapt to.
   * @param  Extends {@link BaseFile}
   * @return The child Resource as the specified BaseFile implementation Model.
   * @throws ChildResourceNotFoundException No child resource matching the specified name was
   *     found.
   * @throws InvalidResourceTypeException The specified child Resource was found, but could not
   *     be adapted to the expected BaseFile implementation Model. Most likely caused by an invalid
   *     jcr:mimeType value.
   */
  public static  T getChildAsFileType(final String name,
      final BaseResource baseResource, final Class type)
      throws ChildResourceNotFoundException, InvalidResourceTypeException {
    return getChildAsFileType(name, baseResource.getResource(), type);
  }


}