UserPreferences.m

//
//  UserPreferences.m
//  iSH
//
//  Created by Charlie Melbye on 11/12/18.
//

#import <UIKit/UIKit.h>
#import "UserPreferences.h"

static NSString *const kPreferenceCapsLockMappingKey = @"Caps Lock Mapping";
static NSString *const kPreferenceOptionMappingKey = @"Option Mapping";
static NSString *const kPreferenceBacktickEscapeKey = @"Backtick Mapping Escape";
static NSString *const kPreferenceHideExtraKeysWithExternalKeyboard = @"Hide Extra Keys With External Keyboard";
static NSString *const kPreferenceOverrideControlSpace = @"Override Control Space";
static NSString *const kPreferenceFontFamilyKey = @"Font Family";
static NSString *const kPreferenceFontSizeKey = @"Font Size";
static NSString *const kPreferenceThemeKey = @"Theme";
static NSString *const kPreferenceDisableDimmingKey = @"Disable Dimming";
NSString *const kPreferenceLaunchCommandKey = @"Init Command";
NSString *const kPreferenceBootCommandKey = @"Boot Command";

@implementation UserPreferences {
    NSUserDefaults *_defaults;
}

+ (instancetype)shared {
    static UserPreferences *shared = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        shared = [[self alloc] init];
    });
    return shared;
}

- (instancetype)init {
    self = [super init];
    if (self) {
        _defaults = [NSUserDefaults standardUserDefaults];
        Theme *defaultTheme = [Theme presetThemeNamed:@"Light"];
        [_defaults registerDefaults:@{
            kPreferenceFontFamilyKey: @"Menlo",
            kPreferenceFontSizeKey: @(12),
            kPreferenceThemeKey: defaultTheme.properties,
            kPreferenceCapsLockMappingKey: @(CapsLockMapControl),
            kPreferenceOptionMappingKey: @(OptionMapNone),
            kPreferenceBacktickEscapeKey: @(NO),
            kPreferenceDisableDimmingKey: @(NO),
            kPreferenceLaunchCommandKey: @[@"/bin/login", @"-f", @"root"],
            kPreferenceBootCommandKey: @[@"/sbin/init"],
        }];
        _theme = [[Theme alloc] initWithProperties:[_defaults objectForKey:kPreferenceThemeKey]];
    }
    return self;
}

- (CapsLockMapping)capsLockMapping {
    return [_defaults integerForKey:kPreferenceCapsLockMappingKey];
}
- (void)setCapsLockMapping:(CapsLockMapping)capsLockMapping {
    [_defaults setInteger:capsLockMapping forKey:kPreferenceCapsLockMappingKey];
}

- (OptionMapping)optionMapping {
    return [_defaults integerForKey:kPreferenceOptionMappingKey];
}
- (void)setOptionMapping:(OptionMapping)optionMapping {
    [_defaults setInteger:optionMapping forKey:kPreferenceOptionMappingKey];
}

- (BOOL)backtickMapEscape {
    return [_defaults boolForKey:kPreferenceBacktickEscapeKey];
}
- (void)setBacktickMapEscape:(BOOL)backtickMapEscape {
    [_defaults setBool:backtickMapEscape forKey:kPreferenceBacktickEscapeKey];
}

- (BOOL)hideExtraKeysWithExternalKeyboard {
    return [_defaults boolForKey:kPreferenceHideExtraKeysWithExternalKeyboard];
}
- (void)setHideExtraKeysWithExternalKeyboard:(BOOL)hideExtraKeysWithExternalKeyboard {
    [_defaults setBool:hideExtraKeysWithExternalKeyboard forKey:kPreferenceHideExtraKeysWithExternalKeyboard];
}
- (BOOL)overrideControlSpace {
    return [_defaults boolForKey:kPreferenceOverrideControlSpace];
}
- (void)setOverrideControlSpace:(BOOL)overrideControlSpace {
    [_defaults setBool:overrideControlSpace forKey:kPreferenceOverrideControlSpace];
}
- (NSNumber *)fontSize {
    return [_defaults objectForKey:kPreferenceFontSizeKey];
}
- (void)setFontSize:(NSNumber *)fontSize {
    [_defaults setObject:fontSize forKey:kPreferenceFontSizeKey];
}

- (NSString *)fontFamily {
    return [_defaults objectForKey:kPreferenceFontFamilyKey];
}
- (void)setFontFamily:(NSString *)fontFamily {
    [_defaults setObject:fontFamily forKey:kPreferenceFontFamilyKey];
}

- (UIColor *)foregroundColor {
    return self.theme.foregroundColor;
}
- (UIColor *)backgroundColor {
    return self.theme.backgroundColor;
}

- (void)setTheme:(Theme *)theme {
    _theme = theme;
    [_defaults setObject:theme.properties forKey:kPreferenceThemeKey];
}

- (BOOL)shouldDisableDimming {
    return [_defaults boolForKey:kPreferenceDisableDimmingKey];
}
- (void)setShouldDisableDimming:(BOOL)dim {
    [_defaults setBool:dim forKey:kPreferenceDisableDimmingKey];
}

- (NSArray<NSString *> *)launchCommand {
    return [_defaults stringArrayForKey:kPreferenceLaunchCommandKey];
}
- (void)setLaunchCommand:(NSArray<NSString *> *)launchCommand {
    [_defaults setObject:launchCommand forKey:kPreferenceLaunchCommandKey];
}
- (BOOL)hasChangedLaunchCommand {
    NSArray *defaultLaunchCommand = [[[NSUserDefaults alloc] initWithSuiteName:NSRegistrationDomain] stringArrayForKey:kPreferenceLaunchCommandKey];
    return ![self.launchCommand isEqual:defaultLaunchCommand];
}

- (NSArray<NSString *> *)bootCommand {
    return [_defaults stringArrayForKey:kPreferenceBootCommandKey];
}
- (void)setBootCommand:(NSArray<NSString *> *)bootCommand {
    [_defaults setObject:bootCommand forKey:kPreferenceBootCommandKey];
}

@end

static id ArchiveColor(UIColor *color) {
    CGFloat r, g, b;
    [color getRed:&r green:&g blue:&b alpha:nil];
    return [NSString stringWithFormat:@"%f %f %f", r, g, b];
}
static UIColor *UnarchiveColor(id data) {
    NSArray<NSString *> *components = [data componentsSeparatedByString:@" "];
    CGFloat r = components[0].doubleValue;
    CGFloat g = components[1].doubleValue;
    CGFloat b = components[2].doubleValue;
    return [UIColor colorWithRed:r green:g blue:b alpha:1];
}

@implementation Theme

- (instancetype)initWithProperties:(NSDictionary<NSString *,id> *)props {
    if (self = [super init]) {
        _foregroundColor = UnarchiveColor(props[kThemeForegroundColor]);
        _backgroundColor = UnarchiveColor(props[kThemeBackgroundColor]);
    }
    return self;
}

+ (instancetype)_themeWithForegroundColor:(UIColor *)foreground backgroundColor:(UIColor *)background {
    return [[self alloc] initWithProperties:@{kThemeForegroundColor: ArchiveColor(foreground),
                                              kThemeBackgroundColor: ArchiveColor(background)}];
}

- (UIStatusBarStyle)statusBarStyle {
    CGFloat lightness;
    [self.backgroundColor getWhite:&lightness alpha:nil];
    if (lightness > 0.5) {
        if (@available(iOS 13, *))
            return UIStatusBarStyleDarkContent;
        else
            return UIStatusBarStyleDefault;
    } else {
        return UIStatusBarStyleLightContent;
    }
}

- (UIKeyboardAppearance)keyboardAppearance {
    CGFloat lightness;
    [self.backgroundColor getWhite:&lightness alpha:nil];
    if (lightness > 0.5)
        return UIKeyboardAppearanceLight;
    else
        return UIKeyboardAppearanceDark;
}

- (NSDictionary<NSString *,id> *)properties {
    return @{kThemeForegroundColor: ArchiveColor(self.foregroundColor),
             kThemeBackgroundColor: ArchiveColor(self.backgroundColor)};
}

- (BOOL)isEqual:(id)object {
    if ([self class] != [object class])
        return NO;
    return [self.properties isEqualToDictionary:[object properties]];
}

NSDictionary<NSString *, Theme *> *presetThemes;
+ (void)initialize {
    presetThemes = @{@"Light": [self _themeWithForegroundColor:UIColor.blackColor
                                               backgroundColor:UIColor.whiteColor],
                     @"Dark":  [self _themeWithForegroundColor:UIColor.whiteColor
                                               backgroundColor:UIColor.blackColor],
                     @"1337":  [self _themeWithForegroundColor:UIColor.greenColor
                                               backgroundColor:UIColor.blackColor]};
}

+ (NSArray<NSString *> *)presetNames {
    return @[@"Light", @"Dark", @"1337"];
}
+ (instancetype)presetThemeNamed:(NSString *)name {
    return presetThemes[name];
}
- (NSString *)presetName {
    for (NSString *name in presetThemes) {
        if ([self isEqual:presetThemes[name]])
            return name;
    }
    return nil;
}

@end

NSString *const kThemeForegroundColor = @"ForegroundColor";
NSString *const kThemeBackgroundColor = @"BackgroundColor";