// Copyright 2015-present 650 Industries. All rights reserved.

#import "EXAppLoader.h"
#import "EXErrorView.h"
#import "EXEnvironment.h"
#import "EXKernel.h"
#import "EXKernelAppRecord.h"
#import "EXUtil.h"

@interface EXErrorView ()

@property (nonatomic, strong) IBOutlet UILabel *lblError;
@property (nonatomic, strong) IBOutlet UIButton *btnRetry;
@property (nonatomic, strong) IBOutlet UIButton *btnBack;
@property (nonatomic, strong) IBOutlet UIStackView *btnStack;
@property (nonatomic, strong) IBOutlet UIView *btnStackContainer;
@property (nonatomic, strong) IBOutlet UILabel *lblUrl;
@property (nonatomic, strong) IBOutlet UILabel *lblErrorDetail;
@property (nonatomic, strong) IBOutlet UIScrollView *vContainer;

- (void)_onTapRetry;

@end

@implementation EXErrorView

- (instancetype)initWithFrame:(CGRect)frame
{
  if (self = [super initWithFrame:frame]) {
    [[NSBundle mainBundle] loadNibNamed:@"EXErrorView" owner:self options:nil];
    [self addSubview:_vContainer];
    
    [_btnRetry addTarget:self action:@selector(_onTapRetry) forControlEvents:UIControlEventTouchUpInside];
    [_btnBack addTarget:self action:@selector(_onTapBack) forControlEvents:UIControlEventTouchUpInside];
    
    for (UIButton *btnToStyle in @[ _btnRetry, _btnBack ]) {
      btnToStyle.layer.cornerRadius = 4.0;
      btnToStyle.layer.masksToBounds = YES;
    }
  }
  return self;
}

- (void)setType:(EXFatalErrorType)type
{
  _type = type;
  NSString *appOwnerName = @"the requested app";
  if (_appRecord) {
    if (_appRecord == [EXKernel sharedInstance].appRegistry.homeAppRecord) {
      appOwnerName = @"Expo";
    } else if (_appRecord.appLoader.manifest && _appRecord.appLoader.manifest.name) {
      appOwnerName = [NSString stringWithFormat:@"\"%@\"", _appRecord.appLoader.manifest.name];
    }
  }

  switch (type) {
    case kEXFatalErrorTypeLoading: {
      _lblError.text = [NSString stringWithFormat:@"There was a problem loading %@.", appOwnerName];
      break;
    }
    case kEXFatalErrorTypeException: {
      _lblError.text = [NSString stringWithFormat:@"There was a problem running %@.", appOwnerName];
      break;
    }
  }
  [self _resetUIState];
}

- (void)setError:(NSError *)error
{
  _error = error;
  _lblErrorDetail.text = [error localizedDescription];
  switch (_type) {
    case kEXFatalErrorTypeLoading: {
      if (_error.code == kCFURLErrorNotConnectedToInternet) {
        _lblErrorDetail.text = [NSString stringWithFormat:@"%@ Make sure you're connected to the internet.", _lblErrorDetail.text];
      } else if (_appRecord.appLoader.manifestUrl) {
        NSString *url = _appRecord.appLoader.manifestUrl.absoluteString;
        if ([self _urlLooksLikeLAN:url]) {
          NSString *extraLANPermissionText = @"";
          if (@available(iOS 14, *)) {
            extraLANPermissionText = @", and that you have granted Expo Go the Local Network permission in the Settings app,";
          }
          _lblErrorDetail.text = [NSString stringWithFormat:
                            @"%@\n\nIt looks like you may be using a LAN URL. "
                            "Make sure your device is on the same network as the server%@ or try using the tunnel connection type.", _lblErrorDetail.text, extraLANPermissionText];
        }
      }
      break;
    }
    case kEXFatalErrorTypeException: {
      break;
    }
  }
  [self _resetUIState];
}

- (void)setAppRecord:(EXKernelAppRecord *)appRecord
{
  _appRecord = appRecord;
  [self _resetUIState];
}

- (void)layoutSubviews
{
  [super layoutSubviews];
 
  if (@available(iOS 12.0, *)) {
    switch (UIScreen.mainScreen.traitCollection.userInterfaceStyle) {
      case UIUserInterfaceStyleDark:
        self.backgroundColor = [EXUtil colorWithRGB:0x25292E];
        break;
      case UIUserInterfaceStyleLight:
      case UIUserInterfaceStyleUnspecified:
        break;
      default:
        break;
    }
  }
  
  _vContainer.translatesAutoresizingMaskIntoConstraints = NO;

  UILayoutGuide *guide = self.safeAreaLayoutGuide;
  [_vContainer.leadingAnchor constraintEqualToAnchor:guide.leadingAnchor].active = YES;
  [_vContainer.trailingAnchor constraintEqualToAnchor:guide.trailingAnchor].active = YES;
  [_vContainer.topAnchor constraintEqualToAnchor:guide.topAnchor].active = YES;
  [_vContainer.bottomAnchor constraintEqualToAnchor:guide.bottomAnchor].active = YES;

  UIImage *btnRetryBgImage = [self imageWithSize:_btnRetry.frame.size color:  [EXUtil colorWithRGB:0x25292E]];
  [_btnRetry setBackgroundImage:btnRetryBgImage forState:UIControlStateNormal];
  
  UIImage *btnBackBgImage = [self imageWithSize:_btnBack.frame.size color:  [EXUtil colorWithRGB:0xF0F1F2]];
  [_btnBack setBackgroundImage:btnBackBgImage forState:UIControlStateNormal];
}

#pragma mark - Internal

- (void)_resetUIState
{
  EXKernelAppRecord *homeRecord = [EXKernel sharedInstance].appRegistry.homeAppRecord;
  _btnBack.hidden = (!homeRecord || _appRecord == homeRecord);
  _lblUrl.hidden = (!homeRecord && ![self _isDevDetached]);
  _lblUrl.text = _appRecord.appLoader.manifestUrl.absoluteString;
  // TODO: maybe hide retry (see BrowserErrorView)
  [self setNeedsLayout];
}

- (void)_onTapRetry
{
  if (_delegate) {
    [_delegate errorViewDidSelectRetry:self];
  }
}

- (void)_onTapBack
{
  if ([EXKernel sharedInstance].browserController) {
    [[EXKernel sharedInstance].browserController moveHomeToVisible];
  }
}

- (BOOL)_urlLooksLikeLAN:(NSString *)url
{
  return (
    url && (
      [url rangeOfString:@".local"].length > 0 ||
      [url rangeOfString:@"192."].length > 0 ||
      [url rangeOfString:@"10."].length > 0 ||
      [url rangeOfString:@"172."].length > 0
    )
  );
}

- (BOOL)_isDevDetached
{
  return [EXEnvironment sharedEnvironment].isDetached && [EXEnvironment sharedEnvironment].isDebugXCodeScheme;
}

// for creating a filled button background in iOS < 15
- (UIImage *)imageWithSize:(CGSize)size color:(UIColor *)color
{
  UIGraphicsBeginImageContextWithOptions(size, true, 0.0);
  [color setFill];
  UIRectFill(CGRectMake(0.0, 0.0, size.width, size.height));
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

@end