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/*
 * Copyright 2013 eXo Platform SAS
 *
 * 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.
 */
package juzu.impl.plugin.asset;

import juzu.asset.AssetLocation;
import juzu.impl.common.JSON;
import juzu.impl.compiler.ElementHandle;
import juzu.plugin.asset.Minifier;

import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Julien Viet
 */
public class Asset implements Serializable {

  /** Asset identifiers for dependencies. */
  public final String id;

  /** Asset type. */
  public final String type;

  /** . */
  public final Boolean header;

  /** Asset dependencies. */
  public final List depends;

  /** Coordinate of the asset. */
  public final AssetKey key;

  /** The minified version of the asset. */
  public final String minified;

  /** The asset max age. */
  public final Integer maxAge;

  /** . */
  public final List minifiersTypes;

  public Asset(String type, Map asset) {
    String id = (String)asset.get("id");
    String value = (String)asset.get("value");
    List depends = (List)asset.get("depends");
    AssetLocation location = AssetLocation.safeValueOf((String)asset.get("location"));
    Integer maxAge = (Integer)asset.get("maxAge");
    String minified = (String)asset.get("minified");
    Boolean header = (Boolean)asset.get("header");
    List minifiersTypes = (List)asset.get("minifier");

    //
    if (type == null) {
      throw new NullPointerException("No null type accepted");
    }
    if (id == null) {
      throw new IllegalArgumentException("No null id accepted");
    }
    if (value == null) {
      throw new IllegalArgumentException("No null value accepted");
    }
    if (location == null) {
      throw new IllegalArgumentException("No null location accepted");
    }

    //
    this.id = id;
    this.type = type;
    this.depends = depends != null ? depends : new ArrayList();
    this.key = new AssetKey(value, location);
    this.maxAge = maxAge;
    this.minified = minified;
    this.header = header;
    this.minifiersTypes = minifiersTypes != null ? minifiersTypes : Collections.emptyList();
  }

  public Asset(
      String id,
      String type,
      String value,
      String minified,
      List depends,
      AssetLocation location,
      Integer maxAge,
      Boolean header) {
    if (type == null) {
      throw new NullPointerException("No null type accepted");
    }
    if (id == null) {
      throw new NullPointerException("No null id accepted");
    }
    if (value == null) {
      throw new NullPointerException("No null value accepted");
    }
    if (location == null) {
      throw new NullPointerException("No null location accepted");
    }

    //
    this.id = id;
    this.type = type;
    this.depends = depends;
    this.key = new AssetKey(value, location);
    this.maxAge = maxAge;
    this.minified = minified;
    this.header = header;
    this.minifiersTypes = Collections.emptyList();
  }

  public boolean isApplication() {
    return key.location == AssetLocation.APPLICATION;
  }

  /**
   * @return the asset source, this method can be subclassed to provide a custom source
   */
  protected String getSource() {
    return key.value;
  }

  /**
   * @return the minified version of the source value
   */
  private String getMinifiedSource() {
    String source = getSource();
    int index = source.lastIndexOf(".");
    if (index == -1) {
      return source + "-min";
    } else {
      return source.substring(0, index) + "-min." + source.substring(index + 1);
    }
  }

  public Map getSources() {
    HashMap sources = new HashMap();
    String source = getSource();
    sources.put(key.value, source);
    if (minified != null) {
      sources.put(minified, minified);
    } else if (minifiersTypes.size() > 0) {
      sources.put(getMinifiedSource(), source);
    }
    return sources;
  }

  public JSON getJSON() {
    JSON json = new JSON().
        set("value", key.value).
        set("location", key.location.toString()).
        set("type", type);
    if (minified != null) {
      json.set("minified", minified);
    } else if (minifiersTypes.size() > 0) {
      json.set("minified", getMinifiedSource());
    }
    if (maxAge != null) {
      json.set("max-age", maxAge);
    }
    if (depends != null) {
      json.set("depends", depends);
    }
    if (header != null) {
      json.set("header", header);
    }
    return json;
  }

  /**
   * Provide an opportunity to process the asset resource.
   *
   * @param source the source
   * @param resource the resource to open
   * @return the effective resource stream
   */
  public InputStream open(String source, URLConnection resource) throws IOException {
    InputStream in = resource.getInputStream();
    if (source.equals(key.value)) {
      return in;
    } else {
      if (minifiersTypes.size() > 0) {

        // Get the minifiers first
        List minifiers = new ArrayList(minifiersTypes.size());
        for (ElementHandle.Type minifierType : minifiersTypes) {
          try {
            Class minifierClass = (Class)Asset.class.getClassLoader().loadClass(minifierType.getName().toString());
            Minifier minifier = minifierClass.newInstance();
            minifiers.add(minifier);
          }
          catch (InstantiationException e) {
            throw new IOException(e.getMessage(), e.getCause());
          }
          catch (Exception e) {
            throw new IOException(e);
          }
        }

        // Now transform
        for (Minifier minifier : minifiers) {
          in = minifier.minify(source, type, in);
        }
      }
    }
    return in;
  }
}