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/*
 * Copyright 2017 Google 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.google.firebase.auth;

import com.google.api.client.auth.openidconnect.IdToken;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.webtoken.JsonWebSignature;
import com.google.api.client.util.Key;

import java.io.IOException;
import java.util.Map;

/**
 * Implementation of a Parsed Firebase Token returned by {@link FirebaseAuth#verifyIdToken(String)}.
 * It can used to get the uid and other attributes of the user provided in the Token.
 */
public final class FirebaseToken {

  private final FirebaseTokenImpl token;

  FirebaseToken(FirebaseTokenImpl token) {
    this.token = token;
  }

  static FirebaseToken parse(JsonFactory jsonFactory, String tokenString) throws IOException {
    try {
      JsonWebSignature jws =
          JsonWebSignature.parser(jsonFactory)
              .setPayloadClass(FirebaseTokenImpl.Payload.class)
              .parse(tokenString);
      return new FirebaseToken(
          new FirebaseTokenImpl(
              jws.getHeader(),
              (FirebaseTokenImpl.Payload) jws.getPayload(),
              jws.getSignatureBytes(),
              jws.getSignedContentBytes()));
    } catch (IOException e) {
      throw new IOException(
          "Decoding Firebase ID token failed. Make sure you passed the entire string JWT "
              + "which represents an ID token. See https://firebase.google.com/docs/auth/admin/"
              + "verify-id-tokens for details on how to retrieve an ID token.",
          e);
    }
  }

  /** Returns the Uid for the this token. */
  public String getUid() {
    return token.getPayload().getSubject();
  }

  /** Returns the Issuer for the this token. */
  public String getIssuer() {
    return token.getPayload().getIssuer();
  }

  /** Returns the user's display name. */
  public String getName() {
    return token.getPayload().getName();
  }

  /** Returns the Uri string of the user's profile photo. */
  public String getPicture() {
    return token.getPayload().getPicture();
  }

  /** 
   * Returns the e-mail address for this user, or {@code null} if it's unavailable.
   */
  public String getEmail() {
    return token.getPayload().getEmail();
  }

  /** 
   * Indicates if the email address returned by {@link #getEmail()} has been verified as good.
   */
  public boolean isEmailVerified() {
    return token.getPayload().isEmailVerified();
  }

  /** Returns a map of all of the claims on this token. */
  public Map getClaims() {
    return token.getPayload();
  }

  FirebaseTokenImpl getToken() {
    return token;
  }

  static class FirebaseTokenImpl extends IdToken {

    FirebaseTokenImpl(
        Header header, Payload payload, byte[] signatureBytes, byte[] signedContentBytes) {
      super(header, payload, signatureBytes, signedContentBytes);
    }

    @Override
    public Payload getPayload() {
      return (Payload) super.getPayload();
    }

    /** Represents a FirebaseWebToken Payload. */
    public static class Payload extends IdToken.Payload {

      /**
       * Timestamp of the last time this user authenticated with Firebase on the device receiving
       * this token.
       */
      @Key("auth_time")
      private long authTime;

      /** User's primary email address. */
      @Key private String email;

      /** Indicates whether or not the e-mail field is verified to be a known-good address. */
      @Key("email_verified")
      private boolean emailVerified;

      /** User's Display Name. */
      @Key private String name;

      /** URI of the User's profile picture. */
      @Key private String picture;

      /**
       * Returns the UID of the user represented by this token. This is an alias for {@link
       * #getSubject()}
       */
      public String getUid() {
        return getSubject();
      }

      /**
       * Returns the time in seconds from the Unix Epoch that this user last authenticated with
       * Firebase on this device.
       */
      public long getAuthTime() {
        return authTime;
      }

      /** 
       * Returns the e-mail address for this user, or {@code null} if it's unavailable.
       */
      public String getEmail() {
        return email;
      }

      /**
       * Indicates if the email address returned by {@link #getEmail()} has been verified as good.
       */
      public boolean isEmailVerified() {
        return emailVerified;
      }

      /** Returns the user's display name. */
      public String getName() {
        return name;
      }

      /** Returns the Uri string of the user's profile photo. */
      public String getPicture() {
        return picture;
      }
    }
  }
}