//
//  KBExtensionAppLauncher.m
//  CustomKeyboard
//

#import "KBExtensionAppLauncher.h"

#if KB_URL_BRIDGE_ENABLE
#import <objc/message.h>
#endif

@implementation KBExtensionAppLauncher

#if KB_URL_BRIDGE_ENABLE
+ (BOOL)kb_openURLViaResponderChain:(NSURL *)url
                             source:(nullable UIResponder *)source
                         completion:(void (^ _Nullable)(BOOL success))completion {
    if (!url) {
        if (completion) { completion(NO); }
        return NO;
    }

    UIResponder *responder = source;

    // 优先尝试 openURL:options:completionHandler:
    // 注意：在键盘扩展里走“响应链兜底”本身就存在不确定性；不同系统/宿主 App 的实现
    // 可能对 options 参数的类型有不同假设。为避免类型不匹配导致崩溃，options 统一传 nil。
    SEL openURLOptionsSel = NSSelectorFromString(@"openURL:options:completionHandler:");
    while (responder) {
        if ([responder respondsToSelector:openURLOptionsSel]) {
            void (*msgSend)(id, SEL, NSURL *, id, void (^)(BOOL)) = (void *)objc_msgSend;
            msgSend(responder, openURLOptionsSel, url, nil, ^(BOOL ok) {
                if (completion) { completion(ok); }
            });
            return YES;
        }
        responder = responder.nextResponder;
    }

    // 尝试 openURL:completionHandler:
    responder = source;
    SEL openURLCompletionSel = NSSelectorFromString(@"openURL:completionHandler:");
    while (responder) {
        if ([responder respondsToSelector:openURLCompletionSel]) {
            void (*msgSend)(id, SEL, NSURL *, void (^)(BOOL)) = (void *)objc_msgSend;
            msgSend(responder, openURLCompletionSel, url, ^(BOOL ok) {
                if (completion) { completion(ok); }
            });
            return YES;
        }
        responder = responder.nextResponder;
    }

    // 兜底：openURL:
    responder = source;
    SEL openURLSel = NSSelectorFromString(@"openURL:");
    while (responder) {
        if ([responder respondsToSelector:openURLSel]) {
            BOOL (*msgSend)(id, SEL, NSURL *) = (void *)objc_msgSend;
            BOOL ok = msgSend(responder, openURLSel, url);
            if (completion) { completion(ok); }
            return YES;
        }
        responder = responder.nextResponder;
    }

    if (completion) { completion(NO); }
    return NO;
}
#endif

+ (void)openPrimaryURL:(NSURL * _Nullable)primaryURL
           fallbackURL:(NSURL * _Nullable)fallbackURL
  usingInputController:(UIInputViewController *)ivc
                source:(UIResponder * _Nullable)source
            completion:(void (^ _Nullable)(BOOL success))completion {
    if (![NSThread isMainThread]) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self openPrimaryURL:primaryURL
                     fallbackURL:fallbackURL
            usingInputController:ivc
                          source:source
                      completion:completion];
        });
        return;
    }
    if (!ivc || (!primaryURL && !fallbackURL)) {
        if (completion) { completion(NO); }
        return;
    }

    // 保证在主线程回调，避免调用方再做一次 dispatch。
    void (^finish)(BOOL) = ^(BOOL ok){
        if (!completion) return;
        if ([NSThread isMainThread]) {
            completion(ok);
        } else {
            dispatch_async(dispatch_get_main_queue(), ^{ completion(ok); });
        }
    };

    NSURL *first = primaryURL ?: fallbackURL;
    NSURL *second = (first == primaryURL) ? fallbackURL : nil;

    if (!first) {
        finish(NO);
        return;
    }

    [ivc.extensionContext openURL:first completionHandler:^(BOOL ok) {
        if (ok) {
            finish(YES);
            return;
        }

        if (second) {
            [ivc.extensionContext openURL:second completionHandler:^(BOOL ok2) {
                if (ok2) {
                    finish(YES);
                    return;
                }

#if KB_URL_BRIDGE_ENABLE
                // 的场景且业务强依赖时才开启此兜底。
                UIResponder *start = (source ?: (UIResponder *)ivc.view ?: (UIResponder *)ivc);
                [self kb_openURLViaResponderChain:second
                                          source:start
                                      completion:^(BOOL ok3) {
                    finish(ok3);
                }];
#else
                finish(NO);
#endif
            }];
        } else {
#if KB_URL_BRIDGE_ENABLE
            UIResponder *start = (source ?: (UIResponder *)ivc.view ?: (UIResponder *)ivc);
            [self kb_openURLViaResponderChain:first
                                      source:start
                                  completion:^(BOOL ok3) {
                finish(ok3);
            }];
#else
            finish(NO);
#endif
        }
    }];
}

+ (void)openScheme:(NSURL *)scheme
 usingInputController:(UIInputViewController *)ivc
              source:(UIResponder * _Nullable)source
          completion:(void (^ _Nullable)(BOOL success))completion {
    [self openPrimaryURL:scheme
             fallbackURL:nil
    usingInputController:ivc
                  source:source
              completion:completion];
}

@end