//
//  KBLoginVM.m
//

#import "KBLoginVM.h"
#import "AppleSignInManager.h"
#import "KBNetworkManager.h"
#import "KBAuthManager.h"
#import "KBAPI.h"
#import "KBUser.h"
#import "KBMyVM.h"

@interface KBLoginVM ()
@property (atomic, strong, readwrite, nullable) KBUser *currentUser;
@property (nonatomic, strong) KBMyVM *myVM;
@end

@implementation KBLoginVM

+ (instancetype)shared {
    static KBLoginVM *vm; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ vm = [KBLoginVM new]; });
    return vm;
}

- (BOOL)isLoggedIn {
    return [[KBAuthManager shared] isLoggedIn];
}

- (void)signInWithAppleFromViewController:(UIViewController *)presenter
                                completion:(KBLoginCompletion)completion {
    // 调起 Apple 登录
    [[AppleSignInManager shared] signInFromViewController:presenter completion:^(ASAuthorizationAppleIDCredential * _Nullable credential, NSError * _Nullable error) {
        if (error) { if (completion) completion(NO, error); return; }
        if (![credential isKindOfClass:[ASAuthorizationAppleIDCredential class]]) {
            if (completion) completion(NO, [NSError errorWithDomain:@"KBLogin" code:-1 userInfo:@{NSLocalizedDescriptionKey: KBLocalized(@"Invalid login credential")}]);
            return;
        }

        ASAuthorizationAppleIDCredential *cred = (ASAuthorizationAppleIDCredential *)credential;
        // identityToken/authorizationCode 均可按后端要求传递；本项目后端使用 identityToken 映射为 code
        NSString *identityToken = cred.identityToken ? [[NSString alloc] initWithData:cred.identityToken encoding:NSUTF8StringEncoding] : nil;
        NSString *authorizationCode = cred.authorizationCode ? [[NSString alloc] initWithData:cred.authorizationCode encoding:NSUTF8StringEncoding] : nil;

        NSMutableDictionary *params = [NSMutableDictionary dictionary];
        if (identityToken.length) params[@"identityToken"] = identityToken;
        if (authorizationCode.length) params[@"accessCode"] = authorizationCode; // 仅供后端需要时使用
        if (cred.user.length) params[@"userID"] = cred.user; // 可选
        // 如有本地缓存的性别（首次进入首页时选择），一并上传给后端
        NSNumber *genderNumber = [self kb_localGenderParamIfAvailable];
        if (genderNumber != nil) {
            params[@"gender"] = genderNumber;
        }
        [KBHUD show];
        // 向服务端发起校验
        [[KBNetworkManager shared] POST:API_APPLE_LOGIN jsonBody:params headers:nil completion:^(NSDictionary * _Nullable jsonOrData, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            [KBHUD dismiss];
            if (error) { if (completion) completion(NO, error); return; }

            // 从返回 JSON 中提取 token（支持常见命名与层级 data/user）
            // 先解析用户模型（使用 MJExtension）
            NSDictionary *dict = jsonOrData[@"data"];
            KBUser *user = [KBUser mj_objectWithKeyValues:dict];
            self.currentUser = user;
            if (user.token.length == 0) {
                if (completion) completion(NO, [NSError errorWithDomain:@"KBLogin" code:-2 userInfo:@{NSLocalizedDescriptionKey: KBLocalized(@"No token returned")}]);
                return;
            }
            [[KBUserSessionManager shared] handleLoginSuccessWithUser:user];
            [self kb_syncKeyboardCharactersAfterLogin];
            if (completion) completion(YES, nil);
            // 保存登录态到共享钥匙串；供 App 与扩展共享
//            BOOL ok = [[KBAuthManager shared] saveAccessToken:user.token
//                                                refreshToken:nil
//                                                  expiryDate:nil
//                                              userIdentifier:cred.user];
//            if (completion) completion(ok, ok ? nil : [NSError errorWithDomain:@"KBLogin" code:-3 userInfo:@{NSLocalizedDescriptionKey: KBLocalized(@"Failed to save login state")}]);
        }];
    }];
}

/// 邮箱登录
- (void)emailLoginEmail:(NSString *)email  password:(NSString *)password WithCompletion:(KBLoginCompletion)completion;
{
    [KBHUD show];
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    if (email.length) params[@"mail"] = email;
    if (password.length) params[@"password"] = password;
    // 如有本地缓存的性别（首次进入首页时选择），一并上传给后端
    NSNumber *genderNumber = [self kb_localGenderParamIfAvailable];
    if (genderNumber != nil) {
        params[@"gender"] = genderNumber;
    }
    // 向服务端发起校验
    [[KBNetworkManager shared] POST:API_EMAIL_LOGIN jsonBody:params headers:nil completion:^(NSDictionary * _Nullable jsonOrData, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        [KBHUD dismiss];
        if (error) { if (completion) completion(NO, error); return; }
        NSDictionary *dict = jsonOrData[@"data"];
        KBUser *user = [KBUser mj_objectWithKeyValues:dict];
        self.currentUser = user;
        if (user.token.length == 0) {
            if (completion) completion(NO, [NSError errorWithDomain:@"KBLogin" code:-2 userInfo:@{NSLocalizedDescriptionKey: KBLocalized(@"No token returned")}]);
            return;
        }
        [[KBUserSessionManager shared] handleLoginSuccessWithUser:user];
        [self kb_syncKeyboardCharactersAfterLogin];
        if (completion) completion(YES, nil);
    }];
}

/// 邮箱注册
- (void)emailRegisterParams:(NSDictionary *)params withCompletion:(KBRegisterCompletion)completion{
    [KBHUD show];
//    NSMutableDictionary *params = [NSMutableDictionary dictionary];
//    if (mailAddress.length) params[@"mailAddress"] = mailAddress;
//    if (password.length) params[@"password"] = password;
//    if (passwordConfirm.length) params[@"passwordConfirm"] = passwordConfirm;
//
//    // 如有本地缓存的性别（首次进入首页时选择），一并上传给后端
//    NSNumber *genderNumber = [self kb_localGenderParamIfAvailable];
//    if (genderNumber != nil) {
//        params[@"gender"] = genderNumber;
//    }
    // 向服务端发起校验
    [[KBNetworkManager shared] POST:API_EMAIL_REGISTER jsonBody:params headers:nil completion:^(NSDictionary * _Nullable jsonOrData, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        [KBHUD dismiss];
        if (error) { if (completion) completion(NO, error); return; }
        if (completion) completion(YES, nil);
    }];
}

/// 发送验证码
- (void)sendVerifyMailWithEmail:(NSString *)email withCompletion:(KBVerifyMailCompletion)completion{
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    if (email.length) params[@"mailAddress"] = email;
    [[KBNetworkManager shared] POST:API_SEND_EMAIL_VERIFYMAIL jsonBody:params headers:nil autoShowBusinessError:true completion:^(NSDictionary * _Nullable json, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
    }];
}

/// 验证验证码
- (void)verifyEMailCode:(NSString *)email verifyCode:(NSString *)verifyCode withCompletion:(KBVerifyMailCompletion)completion{
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    if (email.length){
        params[@"mailAddress"] = email;
        params[@"verifyCode"] = verifyCode;

    }
    [[KBNetworkManager shared] POST:API_VERIFY_EMAIL_CODE jsonBody:params headers:nil autoShowBusinessError:true completion:^(NSDictionary * _Nullable json, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (error) { if (completion) completion(NO, error); return; }
        if (completion) completion(YES, nil);
    }];
    
}
/// 重置密码
- (void)resetPassWord:(NSString *)email password:(NSString *)password confirmPassword:(NSString *)confirmPassword withCompletion:(KBVerifyMailCompletion)completion;{
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"mailAddress"] = email ? email : @"";
    params[@"password"] = password ? password : @"";
    params[@"confirmPassword"] = confirmPassword;

    [[KBNetworkManager shared] POST:API_RESET_PWD jsonBody:params headers:nil autoShowBusinessError:true completion:^(NSDictionary * _Nullable json, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        if (error) { if (completion) completion(NO, error); return; }
        if (completion) completion(YES, nil);
    }];
}

#pragma mark - Private

- (void)kb_syncKeyboardCharactersAfterLogin {
    if (!self.myVM) {
        self.myVM = [[KBMyVM alloc] init];
    }
    /// 防止token写入过慢导致请求head没有token
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.myVM fetchCharacterListByUserWithCompletion:^(NSArray<KBCharacter *> * _Nonnull characterArray, NSError * _Nullable error) {
            if (error) {
                KBLOG(@"[Login] Failed to sync keyboard characters after login: %@", error);
            } else {
                KBLOG(@"[Login] Synced %tu keyboard characters after login", characterArray.count);
            }
        }];
    });
    
}

#pragma mark - Helpers

// 宽松解析：token / access_token / accessToken，支持顶层或 data/user 层
+ (NSString *)tokenFromResponseObject:(id)obj {
    if (![obj isKindOfClass:[NSDictionary class]]) return nil;
    NSDictionary *dict = (NSDictionary *)obj;

    NSString *(^pick)(NSDictionary *) = ^NSString *(NSDictionary *d) {
        NSArray *keys = @[ @"token", @"access_token", @"accessToken" ];
        for (NSString *k in keys) {
            id v = d[k]; if ([v isKindOfClass:NSString.class] && ((NSString *)v).length > 0) return v;
        }
        return nil;
    };

    NSString *t = pick(dict);
    if (t.length) return t;

    id data = dict[@"data"]; if ([data isKindOfClass:NSDictionary.class]) { t = pick(data); if (t.length) return t; }
    id user = dict[@"user"]; if ([user isKindOfClass:NSDictionary.class]) { t = pick(user); if (t.length) return t; }

    // 扩展：允许后端将 token 放在 data.session.token
    NSDictionary *d2 = dict[@"data"]; if ([d2 isKindOfClass:NSDictionary.class]) {
        NSDictionary *session = d2[@"session"]; if ([session isKindOfClass:NSDictionary.class]) { t = pick(session); if (t.length) return t; }
    }
    return nil;
}

/// 读取本地缓存的性别枚举值，用于登录接口上传到后端。
/// - 用户在首次进入首页的性别选择页或个人资料页中选择后，会持久化到 NSUserDefaults。
- (nullable NSNumber *)kb_localGenderParamIfAvailable {
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    // 只有在用户真正看过性别选择页后，才认为本地的性别有效
    BOOL hasShownSexVC = [ud boolForKey:KBSexSelectShownKey];
    if (!hasShownSexVC) {
        return nil;
    }

    NSInteger value = [ud integerForKey:KBSexSelectedGenderKey];
    if (value < UserSexMan || value > UserSexTwoSex) {
        return nil;
    }
    return @(value);
}

@end