//
//  BITAuthenticationViewController.m
//  HockeySDK
//
//  Created by Stephan Diederich on 08.08.13.
//
//

#import "BITAuthenticationViewController.h"
#import "BITAuthenticator_Private.h"
#import "HockeySDKPrivate.h"
#import "HockeySDK.h"
#import "BITHockeyAppClient.h"

@interface BITAuthenticationViewController ()<UITextFieldDelegate> {
  UIStatusBarStyle _statusBarStyle;
}

@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *password;

@end

@implementation BITAuthenticationViewController

- (instancetype) initWithApplicationIdentifier:(NSString*) encodedApplicationIdentifier
                               requirePassword:(BOOL) requiresPassword
                                      delegate:(id<BITAuthenticationViewControllerDelegate>) delegate {
  self = [super initWithStyle:UITableViewStyleGrouped];
  if (self) {
    self.title = BITHockeyLocalizedString(@"HockeyAuthenticatorViewControllerTitle");
    _encodedApplicationIdentifier = [encodedApplicationIdentifier copy];
    _requirePassword = requiresPassword;
    _delegate = delegate;
    _showsCancelButton = YES;
  }
  return self;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  
  [self.tableView setScrollEnabled:NO];
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  
  _statusBarStyle = [[UIApplication sharedApplication] statusBarStyle];
  [[UIApplication sharedApplication] setStatusBarStyle:(self.navigationController.navigationBar.barStyle == UIBarStyleDefault) ? UIStatusBarStyleDefault : UIStatusBarStyleBlackOpaque];

  [self updateCancelButton];
  
  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave
                                                                                         target:self
                                                                                         action:@selector(saveAction:)];
  
  self.navigationItem.rightBarButtonItem.enabled = [self allRequiredFieldsEntered];
}

- (void)viewWillDisappear:(BOOL)animated {
	[super viewWillDisappear:animated];
  
  [[UIApplication sharedApplication] setStatusBarStyle:_statusBarStyle];
}

- (void)setShowsCancelButton:(BOOL)showsCancelButton {
  if(_showsCancelButton != showsCancelButton) {
    _showsCancelButton = showsCancelButton;
    [self updateCancelButton];
  }
}

- (void) updateCancelButton {
  if(self.showsCancelButton) {
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                          target:self
                                                                                          action:@selector(dismissAction:)];
  } else {
    self.navigationItem.leftBarButtonItem = nil;
  }
}

#pragma mark - UIViewController Rotation

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)orientation {
  return YES;
}

#pragma mark - Private methods
- (BOOL)allRequiredFieldsEntered {
  if (self.requirePassword && [self.password length] == 0)
    return NO;
  
  if (![self.email length] || !BITValidateEmail(self.email))
    return NO;
  
  return YES;
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  NSInteger rows = 1;
  
  if ([self requirePassword]) rows ++;
  
  return rows;
}

- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section {
  if (section == 0) {
    return BITHockeyLocalizedString(@"HockeyAuthenticationDataDescription");
  }
  
  return nil;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  static NSString *CellIdentifier = @"InputCell";
  
  UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    
    cell.accessoryType = UITableViewCellAccessoryNone;
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.backgroundColor = [UIColor whiteColor];
    
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(110, 10, self.view.frame.size.width - 110 - 35, 30)];
    if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad) {
      textField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    }
    textField.adjustsFontSizeToFitWidth = YES;
    textField.textColor = [UIColor blackColor];
    textField.backgroundColor = [UIColor lightGrayColor];
    
    if (0 == [indexPath row]) {
      textField.placeholder = BITHockeyLocalizedString(@"HockeyFeedbackUserDataEmailPlaceholder");
      textField.text = self.email;
      
      textField.keyboardType = UIKeyboardTypeEmailAddress;
      if ([self requirePassword])
        textField.returnKeyType = UIReturnKeyNext;
      else
        textField.returnKeyType = UIReturnKeyDone;
      
      [textField addTarget:self action:@selector(userEmailEntered:) forControlEvents:UIControlEventEditingChanged];
      [textField becomeFirstResponder];
    } else {
      textField.placeholder = BITHockeyLocalizedString(@"HockeyAuthenticatorViewControllerPasswordPlaceHolder");
      textField.text = self.password;
      
      textField.keyboardType = UIKeyboardTypeDefault;
      textField.returnKeyType = UIReturnKeyDone;
      textField.secureTextEntry = YES;
      [textField addTarget:self action:@selector(userPasswordEntered:) forControlEvents:UIControlEventEditingChanged];
    }
    
    textField.backgroundColor = [UIColor whiteColor];
    textField.autocorrectionType = UITextAutocorrectionTypeNo;
    textField.autocapitalizationType = UITextAutocapitalizationTypeNone;
    textField.textAlignment = kBITTextLabelAlignmentLeft;
    textField.delegate = self;
    textField.tag = indexPath.row;
    
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    [textField setEnabled: YES];
    
    [cell addSubview:textField];
  }
  
  if (0 == [indexPath row]) {
    cell.textLabel.text = BITHockeyLocalizedString(@"HockeyFeedbackUserDataEmail");
  } else {
    cell.textLabel.text = BITHockeyLocalizedString(@"HockeyAuthenticationViewControllerPassword");
  }
  
  return cell;
}


- (void)userEmailEntered:(id)sender {
  self.email = [(UITextField *)sender text];
  
  self.navigationItem.rightBarButtonItem.enabled = [self allRequiredFieldsEntered];
}

- (void)userPasswordEntered:(id)sender {
  self.password = [(UITextField *)sender text];
  
  self.navigationItem.rightBarButtonItem.enabled = [self allRequiredFieldsEntered];
}

#pragma mark - UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  NSInteger nextTag = textField.tag + 1;
  
  UIResponder* nextResponder = [self.view viewWithTag:nextTag];
  if (nextResponder) {
    [nextResponder becomeFirstResponder];
  } else {
    if ([self allRequiredFieldsEntered]) {
      if ([textField isFirstResponder])
        [textField resignFirstResponder];
      
      [self saveAction:nil];
    }
  }
  return NO; 
}

#pragma mark - Actions
- (void)dismissAction:(id)sender {
  [self.delegate authenticationViewControllerDidCancel:self];
}

- (void)saveAction:(id)sender {
  [self showLoginUI:YES];
  NSParameterAssert(self.encodedApplicationIdentifier);
  

  NSString *authenticationPath = [self authenticationPath];
  NSDictionary *params = [self parametersForAuthentication];
  
  __weak typeof (self) weakSelf = self;
  [self.hockeyAppClient postPath:authenticationPath
                      parameters:params
                      completion:^(BITHTTPOperation *operation, id response, NSError *error) {
                        typeof (self) strongSelf = weakSelf;
                        if(nil == response) {
                          //TODO think about alertview messages
                          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                                          message:@"Failed to authenticate"
                                                                         delegate:nil
                                                                cancelButtonTitle:BITHockeyLocalizedString(@"OK")
                                                                otherButtonTitles:nil];
                          [alert show];
                        } else if(401 == operation.response.statusCode) {
                          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                                          message:@"Not authorized"
                                                                         delegate:nil
                                                                cancelButtonTitle:BITHockeyLocalizedString(@"OK")
                                                                otherButtonTitles:nil];
                          [alert show];
                        } else {
                          NSError *authParseError = nil;
                          NSString *authToken = [strongSelf.class authenticationTokenFromReponse:response
                                                                                           error:&authParseError];
                          if(nil == authToken) {
                            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                                            message:@"Failed to authenticate"
                                                                           delegate:nil
                                                                  cancelButtonTitle:BITHockeyLocalizedString(@"OK")
                                                                  otherButtonTitles:nil];
                            [alert show];
                          } else {
                            [strongSelf.delegate authenticationViewController:strongSelf authenticatedWithToken:authToken];
                          }
                        }
                        [self showLoginUI:NO];
                    }];
}

- (NSDictionary *) parametersForAuthentication {
  if(self.requirePassword) {
    return @{ @"user" : [NSString stringWithFormat:@"%@:%@", self.email, self.password] };
  } else {
    NSString *authCode = BITHockeyMD5([NSString stringWithFormat:@"%@%@",
                                       self.authenticator.authenticationSecret ? : @"",
                                       self.email ? : @""]);
    return @{
             @"email" : self.email,
             @"authcode" : authCode.lowercaseString,
             };
  }
}

- (NSString *) authenticationPath {
  if(self.requirePassword) {
    return [NSString stringWithFormat:@"api/3/apps/%@/identity/authorize", self.encodedApplicationIdentifier];
  } else {
    return [NSString stringWithFormat:@"api/3/apps/%@/identity/check", self.encodedApplicationIdentifier];
  }
}

- (void) showLoginUI:(BOOL) enableLoginUI {
  self.navigationItem.rightBarButtonItem.enabled = !enableLoginUI;
  self.tableView.userInteractionEnabled = !enableLoginUI;
}

+ (NSString *) authenticationTokenFromReponse:(id) response error:(NSError **) error {
  NSParameterAssert(response);
  
  NSError *jsonParseError = nil;
  id jsonObject = [NSJSONSerialization JSONObjectWithData:response
                                                  options:0
                                                    error:&jsonParseError];
  if(nil == jsonObject) {
    if(error) {
      *error = [NSError errorWithDomain:kBITAuthenticatorErrorDomain
                                   code:BITAuthenticatorAPIServerReturnedInvalidRespone
                               userInfo:(jsonParseError ? @{NSUnderlyingErrorKey : jsonParseError} : nil)];
    }
    return nil;
  }
  if(![jsonObject isKindOfClass:[NSDictionary class]]) {
    if(error) {
      *error = [NSError errorWithDomain:kBITAuthenticatorErrorDomain
                                   code:BITAuthenticatorAPIServerReturnedInvalidRespone
                               userInfo:nil];
    }
    return nil;
  }
  NSString *status = jsonObject[@"status"];
  if(nil == status) {
    if(error) {
      *error = [NSError errorWithDomain:kBITAuthenticatorErrorDomain
                                   code:BITAuthenticatorAPIServerReturnedInvalidRespone
                               userInfo:nil];
    }
    return nil;
  } else if([status isEqualToString:@"identified"]) {
    return jsonObject[@"iuid"];
  } else if([status isEqualToString:@"authorized"]) {
    return jsonObject[@"auid"];
  } else {
    if(error) {
      *error = [NSError errorWithDomain:kBITAuthenticatorErrorDomain
                                   code:BITAuthenticatorNotAuthorized
                               userInfo:nil];
    }
    return nil;
  }
}
@end