/*
 * Copyright 2017 Google
 *
 * 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.
 */

#import "FIRVerifyAssertionRequest.h"

NS_ASSUME_NONNULL_BEGIN

/** @var kVerifyAssertionEndpoint
    @brief The "verifyAssertion" endpoint.
 */
static NSString *const kVerifyAssertionEndpoint = @"verifyAssertion";

/** @var kProviderIDKey
    @brief The key for the "providerId" value in the request.
 */
static NSString *const kProviderIDKey = @"providerId";

/** @var kProviderIDTokenKey
    @brief The key for the "id_token" value in the request.
 */
static NSString *const kProviderIDTokenKey = @"id_token";

/** @var kProviderNonceKey
    @brief The key for the "nonce" value in the request.
 */
static NSString *const kProviderNonceKey = @"nonce";

/** @var kProviderAccessTokenKey
    @brief The key for the "access_token" value in the request.
 */
static NSString *const kProviderAccessTokenKey = @"access_token";

/** @var kProviderOAuthTokenSecretKey
    @brief The key for the "oauth_token_secret" value in the request.
 */
static NSString *const kProviderOAuthTokenSecretKey = @"oauth_token_secret";

/** @var kIdentifierKey
    @brief The key for the "identifier" value in the request.
 */
static NSString *const kIdentifierKey = @"identifier";

/** @var kRequestURIKey
    @brief The key for the "requestUri" value in the request.
 */
static NSString *const kRequestURIKey = @"requestUri";

/** @var kPostBodyKey
    @brief The key for the "postBody" value in the request.
 */
static NSString *const kPostBodyKey = @"postBody";

/** @var kPendingTokenKey
    @brief The key for the "pendingToken" value in the request.
 */
static NSString *const kPendingTokenKey = @"pendingToken";

/** @var kAutoCreateKey
    @brief The key for the "autoCreate" value in the request.
 */
static NSString *const kAutoCreateKey = @"autoCreate";

/** @var kIDTokenKey
    @brief The key for the "idToken" value in the request. This is actually the STS Access Token,
        despite it's confusing (backwards compatiable) parameter name.
 */
static NSString *const kIDTokenKey = @"idToken";

/** @var kReturnSecureTokenKey
    @brief The key for the "returnSecureToken" value in the request.
 */
static NSString *const kReturnSecureTokenKey = @"returnSecureToken";

/** @var kReturnIDPCredentialKey
    @brief The key for the "returnIdpCredential" value in the request.
 */
static NSString *const kReturnIDPCredentialKey = @"returnIdpCredential";

/** @var kSessionIDKey
    @brief The key for the "sessionID" value in the request.
 */
static NSString *const kSessionIDKey = @"sessionId";

@implementation FIRVerifyAssertionRequest

- (nullable instancetype)initWithProviderID:(NSString *)providerID
                       requestConfiguration:(FIRAuthRequestConfiguration *)requestConfiguration {
  self = [super initWithEndpoint:kVerifyAssertionEndpoint
            requestConfiguration:requestConfiguration];
  if (self) {
    _providerID = providerID;
    _returnSecureToken = YES;
    _autoCreate = YES;
    _returnIDPCredential = YES;
  }
  return self;
}

- (nullable id)unencodedHTTPRequestBodyWithError:(NSError *_Nullable *_Nullable)error {
  NSURLComponents *components = [[NSURLComponents alloc] init];
  NSMutableArray<NSURLQueryItem *> *queryItems =
      [@[ [NSURLQueryItem queryItemWithName:kProviderIDKey value:_providerID] ] mutableCopy];

  if (_providerIDToken) {
    [queryItems addObject:[NSURLQueryItem queryItemWithName:kProviderIDTokenKey
                                                      value:_providerIDToken]];
  }

  if (_providerRawNonce) {
    [queryItems addObject:[NSURLQueryItem queryItemWithName:kProviderNonceKey
                                                      value:_providerRawNonce]];
  }

  if (_providerAccessToken) {
    [queryItems addObject:[NSURLQueryItem queryItemWithName:kProviderAccessTokenKey
                                                      value:_providerAccessToken]];
  }

  if (!_providerIDToken && !_providerAccessToken && !_pendingToken && !_requestURI) {
    [NSException
         raise:NSInvalidArgumentException
        format:@"One of IDToken, accessToken, pendingToken, or requestURI must be supplied."];
  }

  if (_providerOAuthTokenSecret) {
    [queryItems addObject:[NSURLQueryItem queryItemWithName:kProviderOAuthTokenSecretKey
                                                      value:_providerOAuthTokenSecret]];
  }

  if (_inputEmail) {
    [queryItems addObject:[NSURLQueryItem queryItemWithName:kIdentifierKey value:_inputEmail]];
  }
  [components setQueryItems:queryItems];
  NSMutableDictionary *body = [@{
    kRequestURIKey : _requestURI ?: @"http://localhost",  // Unused by server, but required
    kPostBodyKey : [components query]
  } mutableCopy];

  if (_pendingToken) {
    body[kPendingTokenKey] = _pendingToken;
  }
  if (_accessToken) {
    body[kIDTokenKey] = _accessToken;
  }
  if (_returnSecureToken) {
    body[kReturnSecureTokenKey] = @YES;
  }

  if (_returnIDPCredential) {
    body[kReturnIDPCredentialKey] = @YES;
  }

  if (_sessionID) {
    body[kSessionIDKey] = _sessionID;
  }

  body[kAutoCreateKey] = @(_autoCreate);

  return body;
}

@end

NS_ASSUME_NONNULL_END
