/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * 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.intellij.diagnostic;

import com.intellij.openapi.progress.ProgressIndicator;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

class DevelopersLoader {
  private static final String DEVELOPERS_LIST_URL = "http://ea-engine.labs.intellij.net/data?category=developers";

  private DevelopersLoader() {
  }

  public static Collection<Developer> fetchDevelopers(ProgressIndicator indicator) throws IOException {
    RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(1000).build();
    try (CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build()) {
      return client.execute(new HttpGet(DEVELOPERS_LIST_URL), response -> {
        List<Developer> developers = new LinkedList<Developer>();
        developers.add(Developer.NULL);

        HttpEntity entity = response.getEntity();
        if (entity == null) {
          return developers;
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), StandardCharsets.UTF_8));

        while (true) {
          String line = reader.readLine();
          if (line == null) break;
          int i = line.indexOf('\t');
          if (i == -1) throw new IOException("Protocol error");
          int id = Integer.parseInt(line.substring(0, i));
          String name = line.substring(i + 1);
          developers.add(new Developer(id, name));
          indicator.checkCanceled();
        }

        return developers;
      });
    }
  }
}