/*
 * Copyright (C) 2013 Square, Inc.
 *
 * 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 com.squareup.picasso;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.NetworkInfo;
import java.io.IOException;
import java.io.InputStream;

import static com.squareup.picasso.Downloader.Response;
import static com.squareup.picasso.Picasso.LoadedFrom.DISK;
import static com.squareup.picasso.Picasso.LoadedFrom.NETWORK;

class NetworkBitmapHunter extends BitmapHunter {
  static final int DEFAULT_RETRY_COUNT = 2;
  private static final int MARKER = 65536;

  private final Downloader downloader;

  int retryCount;

  public NetworkBitmapHunter(Picasso picasso, Dispatcher dispatcher, Cache cache, Stats stats,
      Action action, Downloader downloader) {
    super(picasso, dispatcher, cache, stats, action);
    this.downloader = downloader;
    this.retryCount = DEFAULT_RETRY_COUNT;
  }

  @Override Bitmap decode(Request data) throws IOException {
    boolean loadFromLocalCacheOnly = retryCount == 0;

    Response response = downloader.load(data.uri, loadFromLocalCacheOnly);
    if (response == null) {
      return null;
    }

    loadedFrom = response.cached ? DISK : NETWORK;

    Bitmap result = response.getBitmap();
    if (result != null) {
      return result;
    }

    InputStream is = response.getInputStream();
    try {
      return decodeStream(is, data);
    } finally {
      Utils.closeQuietly(is);
    }
  }

  @Override boolean shouldRetry(boolean airplaneMode, NetworkInfo info) {
    boolean hasRetries = retryCount > 0;
    if (!hasRetries) {
      return false;
    }
    retryCount--;
    return info == null || info.isConnectedOrConnecting();
  }

  private Bitmap decodeStream(InputStream stream, Request data) throws IOException {
    if (stream == null) {
      return null;
    }
    MarkableInputStream markStream = new MarkableInputStream(stream);
    stream = markStream;

    long mark = markStream.savePosition(MARKER);

    boolean isWebPFile = Utils.isWebPFile(stream);
    markStream.reset(mark);
    // When decode WebP network stream, BitmapFactory throw JNI Exception and make app crash.
    // Decode byte array instead
    if (isWebPFile) {
      byte[] bytes = Utils.toByteArray(stream);
      BitmapFactory.Options options = null;
      if (data.hasSize()) {
        options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeByteArray(bytes, 0, bytes.length, options);
        calculateInSampleSize(data.targetWidth, data.targetHeight, options);
      }
      return BitmapFactory.decodeByteArray(bytes, 0, bytes.length, options);
    } else {
      BitmapFactory.Options options = null;
      if (data.hasSize()) {
        options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeStream(stream, null, options);
        calculateInSampleSize(data.targetWidth, data.targetHeight, options);

        markStream.reset(mark);
      }
      return BitmapFactory.decodeStream(stream, null, options);
    }
  }
}