//
//  RNKeychainManager.m
//  RNKeychainManager
//
//  Created by Joel Arvidsson on 2015-05-20.
//  Copyright (c) 2015 Joel Arvidsson. All rights reserved.
//

#import <Security/Security.h>
#import "RNKeychainManager.h"
#import "RCTConvert.h"
#import "RCTBridge.h"
#import "RCTUtils.h"

@implementation RNKeychainManager

@synthesize bridge = _bridge;
RCT_EXPORT_MODULE();

// Messages from the comments in <Security/SecBase.h>
NSString *messageForError(NSError *error)
{
  switch (error.code) {
    case errSecUnimplemented:
      return @"Function or operation not implemented.";

    case errSecIO:
      return @"I/O error.";

    case errSecOpWr:
      return @"File already open with with write permission.";

    case errSecParam:
      return @"One or more parameters passed to a function where not valid.";

    case errSecAllocate:
      return @"Failed to allocate memory.";

    case errSecUserCanceled:
      return @"User canceled the operation.";

    case errSecBadReq:
      return @"Bad parameter or invalid state for operation.";

    case errSecNotAvailable:
      return @"No keychain is available. You may need to restart your computer.";

    case errSecDuplicateItem:
      return @"The specified item already exists in the keychain.";

    case errSecItemNotFound:
      return @"The specified item could not be found in the keychain.";

    case errSecInteractionNotAllowed:
      return @"User interaction is not allowed.";

    case errSecDecode:
      return @"Unable to decode the provided data.";

    case errSecAuthFailed:
      return @"The user name or passphrase you entered is not correct.";

    default:
      return error.localizedDescription;
  }
}

NSDictionary * makeError(NSError *error)
{
  return RCTMakeAndLogError(messageForError(error), nil, [error dictionaryWithValuesForKeys:@[@"domain", @"code"]]);
}


RCT_EXPORT_METHOD(setInternetCredentialsForServer:(NSString*)server withUsername:(NSString*)username withPassword:(NSString*)password callback:(RCTResponseSenderBlock)callback){
  // Create dictionary of search parameters
  NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)(kSecClassInternetPassword),  kSecClass, server, kSecAttrServer, kCFBooleanTrue, kSecReturnAttributes, nil];
  
  // Remove any old values from the keychain
  OSStatus osStatus = SecItemDelete((__bridge CFDictionaryRef) dict);
  
  // Create dictionary of parameters to add
  NSData* passwordData = [password dataUsingEncoding:NSUTF8StringEncoding];
  dict = [NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)(kSecClassInternetPassword), kSecClass, server, kSecAttrServer, passwordData, kSecValueData, username, kSecAttrAccount, nil];
  
  // Try to save to keychain
  osStatus = SecItemAdd((__bridge CFDictionaryRef) dict, NULL);

  if (osStatus != noErr) {
    NSError *error = [NSError errorWithDomain:NSOSStatusErrorDomain code:osStatus userInfo:nil];
    return callback(@[makeError(error)]);
  }
  
  callback(@[[NSNull null]]);

}

RCT_EXPORT_METHOD(getInternetCredentialsForServer:(NSString*)server callback:(RCTResponseSenderBlock)callback){
  
  // Create dictionary of search parameters
  NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)(kSecClassInternetPassword), kSecClass, server, kSecAttrServer, kCFBooleanTrue, kSecReturnAttributes, kCFBooleanTrue, kSecReturnData, nil];
  
  // Look up server in the keychain
  NSDictionary* found = nil;
  CFTypeRef foundTypeRef = NULL;
  OSStatus osStatus = SecItemCopyMatching((__bridge CFDictionaryRef) dict, (CFTypeRef*)&foundTypeRef);

  if (osStatus != noErr) {
    NSError *error = [NSError errorWithDomain:NSOSStatusErrorDomain code:osStatus userInfo:nil];
    return callback(@[makeError(error)]);
  }

  found = (__bridge NSDictionary*)(foundTypeRef);
  if (!found) {
    return callback(@[[NSNull null]]);
  }

  // Found
  NSString* username = (NSString*) [found objectForKey:(__bridge id)(kSecAttrAccount)];
  NSString* password = [[NSString alloc] initWithData:[found objectForKey:(__bridge id)(kSecValueData)] encoding:NSUTF8StringEncoding];

  callback(@[[NSNull null], username, password]);
  
}

RCT_EXPORT_METHOD(resetInternetCredentialsForServer:(NSString*)server callback:(RCTResponseSenderBlock)callback){

  // Create dictionary of search parameters
  NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:(__bridge id)(kSecClassInternetPassword), kSecClass, server, kSecAttrServer, kCFBooleanTrue, kSecReturnAttributes, kCFBooleanTrue, kSecReturnData, nil];

  // Remove any old values from the keychain
  OSStatus osStatus = SecItemDelete((__bridge CFDictionaryRef) dict);
  if (osStatus != noErr) {
    NSError *error = [NSError errorWithDomain:NSOSStatusErrorDomain code:osStatus userInfo:nil];
    return callback(@[makeError(error)]);
  }
  
  callback(@[[NSNull null]]);

}

@end