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/**
 * Copyright 2013 Twitter, 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.twitter.hbc.httpclient.auth;

import com.google.common.base.Charsets;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.twitter.hbc.core.HttpConstants;
import com.twitter.joauth.Normalizer;
import com.twitter.joauth.OAuthParams;
import com.twitter.joauth.Request.Pair;
import com.twitter.joauth.Signer;
import com.twitter.joauth.UrlCodec;
import org.apache.http.HttpHeaders;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.AbstractHttpClient;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class OAuth1 implements Authentication {

  private final Normalizer normalizer;
  private final Signer signer;

  private final String consumerKey;
  private final String consumerSecret;
  private final String token;
  private final String tokenSecret;

  private final SecureRandom secureRandom;

  public OAuth1(String consumerKey, String consumerSecret, String token, String tokenSecret) {
    this.consumerKey = Preconditions.checkNotNull(consumerKey);
    this.consumerSecret = Preconditions.checkNotNull(consumerSecret);

    this.token = Preconditions.checkNotNull(token);
    this.tokenSecret = Preconditions.checkNotNull(tokenSecret);

    this.normalizer = Normalizer.getStandardNormalizer();
    this.signer = Signer.getStandardSigner();

    this.secureRandom = new SecureRandom();
  }

  @Override
  public void setupConnection(AbstractHttpClient client) {}

  @Override
  public void signRequest(HttpUriRequest request, String postParams) {
    // TODO: this is a little odd: we already encoded the values earlier, but using URLEncodedUtils.parse will decode the values,
    // which we will encode again.
    List httpGetParams = URLEncodedUtils.parse(request.getURI().getRawQuery(), Charsets.UTF_8);
    List javaParams = new ArrayList(httpGetParams.size());
    for (NameValuePair params : httpGetParams) {
      Pair tuple = new Pair(UrlCodec.encode(params.getName()), UrlCodec.encode(params.getValue()));
      javaParams.add(tuple);
    }

    if (postParams != null) {
      List httpPostParams = URLEncodedUtils.parse(postParams, Charsets.UTF_8);

      for (NameValuePair params : httpPostParams) {
        Pair tuple = new Pair(UrlCodec.encode(params.getName()), UrlCodec.encode(params.getValue()));
        javaParams.add(tuple);
      }
    }

    long timestampSecs = generateTimestamp();
    String nonce = generateNonce();

    OAuthParams.OAuth1Params oAuth1Params = new OAuthParams.OAuth1Params(
      token, consumerKey, nonce, timestampSecs, Long.toString(timestampSecs), "",
      OAuthParams.HMAC_SHA1, OAuthParams.ONE_DOT_OH
    );

    int port = request.getURI().getPort();
    if (port <= 0) {
      // getURI can return a -1 for a port
      if (request.getURI().getScheme().equalsIgnoreCase(HttpConstants.HTTP_SCHEME)) {
        port = HttpConstants.DEFAULT_HTTP_PORT;
      } else if (request.getURI().getScheme().equalsIgnoreCase(HttpConstants.HTTPS_SCHEME)) {
        port = HttpConstants.DEFAULT_HTTPS_PORT;
      } else {
        throw new IllegalStateException("Bad URI scheme: " + request.getURI().getScheme());
      }
    }

    String normalized = normalizer.normalize(
        request.getURI().getScheme(), request.getURI().getHost(), port, request.getMethod().toUpperCase(),
        request.getURI().getPath(), javaParams, oAuth1Params
    );

    String signature;
    try {
      signature = signer.getString(normalized, tokenSecret, consumerSecret);
    } catch (InvalidKeyException e) {
      throw new RuntimeException(e);
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e);
    }

    Map oauthHeaders = new HashMap();
    oauthHeaders.put(OAuthParams.OAUTH_CONSUMER_KEY, quoted(consumerKey));
    oauthHeaders.put(OAuthParams.OAUTH_TOKEN, quoted(token));
    oauthHeaders.put(OAuthParams.OAUTH_SIGNATURE, quoted(signature));
    oauthHeaders.put(OAuthParams.OAUTH_SIGNATURE_METHOD, quoted(OAuthParams.HMAC_SHA1));
    oauthHeaders.put(OAuthParams.OAUTH_TIMESTAMP, quoted(Long.toString(timestampSecs)));
    oauthHeaders.put(OAuthParams.OAUTH_NONCE, quoted(nonce));
    oauthHeaders.put(OAuthParams.OAUTH_VERSION, quoted(OAuthParams.ONE_DOT_OH));
    String header = Joiner.on(", ").withKeyValueSeparator("=").join(oauthHeaders);

    request.setHeader(HttpHeaders.AUTHORIZATION, "OAuth " + header);

  }

  private String quoted(String str) {
    return "\"" + str + "\"";
  }

  private long generateTimestamp() {
    long timestamp = System.currentTimeMillis();
    return timestamp / 1000;
  }

  private String generateNonce() {
    return Long.toString(Math.abs(secureRandom.nextLong())) + System.currentTimeMillis();
  }
}