//
//  KBLangTestVC.m
//

#import "KBLangTestVC.h"

@interface KBLangTestVC ()
@property (nonatomic, strong) UILabel *label;
@property (nonatomic, strong) UIButton *toggleBtn;
@end

@implementation KBLangTestVC

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = UIColor.whiteColor;
    [self buildUI];
    [self refreshTexts];

    // 监听语言变更，实时刷新
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refreshTexts) name:KBLocalizationDidChangeNotification object:nil];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)buildUI {
    CGFloat w = UIScreen.mainScreen.bounds.size.width;

    self.label = [[UILabel alloc] initWithFrame:CGRectMake(24, 120, w - 48, 60)];
    self.label.textAlignment = NSTextAlignmentCenter;
    self.label.numberOfLines = 0;
    [self.view addSubview:self.label];

    self.toggleBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    self.toggleBtn.frame = CGRectMake(40, CGRectGetMaxY(self.label.frame) + 24, w - 80, 48);
    self.toggleBtn.layer.cornerRadius = 8;
    self.toggleBtn.backgroundColor = [UIColor colorWithRed:0.22 green:0.49 blue:0.96 alpha:1];
    [self.toggleBtn setTitleColor:UIColor.whiteColor forState:UIControlStateNormal];
    [self.toggleBtn addTarget:self action:@selector(onToggle) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.toggleBtn];
}

- (void)refreshTexts {
    self.title = KBLocalized(@"lang_test_title");
    NSString *code = [KBLocalizationManager shared].currentLanguageCode ?: @"";
    NSString *fmt = KBLocalized(@"current_lang");
    NSString *fallback = KBLocalized(@"当前：%@");
    self.label.text = [NSString stringWithFormat:fmt.length ? fmt : fallback, code];
    [self.toggleBtn setTitle:KBLocalized(@"lang_toggle") forState:UIControlStateNormal];
}

- (void)onToggle {
    // 弹出系统提示，确认后再切换语言并重建根控制器
    NSString *title = KBLocalized(@"Change Language");
    NSString *msg = KBLocalized(@"Changing language will reload the Home screen.");

    UIAlertController *ac = [UIAlertController alertControllerWithTitle:title
                                                                message:msg
                                                         preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *cancel = [UIAlertAction actionWithTitle:KBLocalized(@"Cancel")
                                                     style:UIAlertActionStyleCancel
                                                   handler:nil];
    __weak typeof(self) weakSelf = self;
    UIAlertAction *ok = [UIAlertAction actionWithTitle:KBLocalized(@"Confirm")
                                                 style:UIAlertActionStyleDefault
                                               handler:^(__unused UIAlertAction * _Nonnull action) {
        __strong typeof(weakSelf) self = weakSelf;
        if (!self) return;

        KBLocalizationManager *mgr = [KBLocalizationManager shared];
        NSString *next = [mgr.currentLanguageCode.lowercaseString hasPrefix:@"zh"] ? @"en" : @"zh-Hans";
        [mgr setCurrentLanguageCode:next persist:YES];

        // 语言切换后重新进入根控制器
        dispatch_async(dispatch_get_main_queue(), ^{
            id<UIApplicationDelegate> appDelegate = UIApplication.sharedApplication.delegate;
            if ([appDelegate respondsToSelector:@selector(setupRootVC)]) {
                // 使用 AppDelegate 的统一入口
                #pragma clang diagnostic push
                #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
                [appDelegate performSelector:@selector(setupRootVC)];
                #pragma clang diagnostic pop
            }
        });
    }];

    [ac addAction:cancel];
    [ac addAction:ok];
    [self presentViewController:ac animated:YES completion:nil];
}

@end