//
//  ExceptionHandler.m
//  IBOSS
//
//  Created by ssl on 2018/3/2.
//  Copyright © 2018年 elongtian. All rights reserved.
//

#import "ExceptionHandler.h"

#include <libkern/OSAtomic.h>

#include <execinfo.h>



NSString * const ExceptionHandlerSignalExceptionName = @"UncaughtExceptionHandlerSignalExceptionName";

NSString * const ExceptionHandlerSignalKey = @"UncaughtExceptionHandlerSignalKey";

NSString * const ExceptionHandlerAddressesKey = @"UncaughtExceptionHandlerAddressesKey";



volatile int32_t UncaughtExceptionCount = 0;

const int32_t UncaughtExceptionMaximum = 10;



const NSInteger ExceptionHandlerSkipAddressCount = 4;

const NSInteger ExceptionHandlerReportAddressCount = 5;



@implementation ExceptionHandler



+ (NSArray *)backtrace

{
    
    void  * callstack[128];
    
    
    
    int frames = backtrace(callstack, 128);
    
    
    char **strs = backtrace_symbols(callstack, frames);
    
    
    
    int i;
    
    NSMutableArray *backtrace = [NSMutableArray arrayWithCapacity:frames];
    
    for (
         
         i = ExceptionHandlerSkipAddressCount;
         
         i < ExceptionHandlerSkipAddressCount +
         
         ExceptionHandlerReportAddressCount;
         
         i++)
        
    {
        
        [backtrace addObject:[NSString stringWithUTF8String:strs[i]]];
        
    }
    
    free(strs);
    
    
    
    return backtrace;
    
}



- (void)alertView:(UIAlertView *)anAlertView clickedButtonAtIndex:(NSInteger)anIndex

{
    
    if (anIndex == 0)
        
    {
        
        dismissed = YES;
        
    }
    
}



- (void)validateAndSaveCriticalApplicationData

{
    
    
}



- (void)handleException:(NSException *)exception

{
    
    [self validateAndSaveCriticalApplicationData];
   // 找到Documents文件夹路径
   NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *dataFilePath = [documentsPath stringByAppendingPathComponent:IBOSSERROR];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    BOOL isDir = NO;
    
    // fileExistsAtPath 判断一个文件或目录是否有效，isDirectory判断是否一个目录
    BOOL existed = [fileManager fileExistsAtPath:dataFilePath isDirectory:&isDir];
    
    if ( !(isDir == YES && existed == YES) ) {
        
        // 在 Document 目录下创建一个 head 目录
        [fileManager createDirectoryAtPath:dataFilePath withIntermediateDirectories:YES attributes:nil error:nil];
    }
    
    
   NSString *str = [exception reason];
   //需要知道字符串最终存储的地方，所以需要创建一个路径去存储字符串
   NSString *strPath = [dataFilePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.log",[self getCurrentTimes]]];
  
    [str writeToFile:strPath atomically:YES encoding:NSUTF8StringEncoding error:nil];

    
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    CFRunLoopRef runLoop = CFRunLoopGetCurrent();
    
    CFArrayRef allModes = CFRunLoopCopyAllModes(runLoop);
    
    
    while (!dismissed)
        
    {
        
        for (NSString *mode in (__bridge NSArray *)allModes)
            
        {
            
            CFRunLoopRunInMode((CFStringRef)mode, 0.001, false);
            
        }
        
    }
    
    
    CFRelease(allModes);
    
    
    
    NSSetUncaughtExceptionHandler(NULL);
    
    signal(SIGABRT, SIG_DFL);
    
    signal(SIGILL, SIG_DFL);
    
    signal(SIGSEGV, SIG_DFL);
    
    signal(SIGFPE, SIG_DFL);
    
    signal(SIGBUS, SIG_DFL);
    
    signal(SIGPIPE, SIG_DFL);
    
    
    if ([[exception name] isEqual:ExceptionHandlerSignalExceptionName])
        
    {
        
        kill(getpid(), [[[exception userInfo] objectForKey:ExceptionHandlerSignalKey] intValue]);
        
    }
    
    else
        
    {
        
        [exception raise];
        
    }
    
}

-(NSString*)getCurrentTimes{
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    
    // ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
    
    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    
    //现在时间,你可以输出来看下是什么格式
    
    NSDate *datenow = [NSDate date];
    
    //----------将nsdate按formatter格式转成nsstring
    
    NSString *currentTimeString = [formatter stringFromDate:datenow];

    return currentTimeString;
    
}

@end

void HandleException(NSException *exception)

{
    
    int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount);
    
    if (exceptionCount > UncaughtExceptionMaximum)
        
    {
        
        return;
        
    }
    
    
    NSArray *callStack = [ExceptionHandler backtrace];
    
    NSMutableDictionary *userInfo =
    
    [NSMutableDictionary dictionaryWithDictionary:[exception userInfo]];
    
    [userInfo
     
     setObject:callStack
     
     forKey:ExceptionHandlerAddressesKey];
    
    
    [[[ExceptionHandler alloc] init]
     
     performSelectorOnMainThread:@selector(handleException:)
     
     withObject:
     
     [NSException
      
      exceptionWithName:[exception name]
      
      reason:[exception reason]
      
      userInfo:userInfo]
     
     waitUntilDone:YES];
    
}



void SignalHandler(int signal)

{
    
    int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount);
    
    if (exceptionCount > UncaughtExceptionMaximum)
        
    {
        
        return;
        
    }
    
    
    NSMutableDictionary *userInfo =
    
    [NSMutableDictionary
     
     dictionaryWithObject:[NSNumber numberWithInt:signal]
     
     forKey:ExceptionHandlerSignalKey];
    
    
    
    NSArray *callStack = [ExceptionHandler backtrace];
    
    [userInfo
     
     setObject:callStack
     
     forKey:ExceptionHandlerAddressesKey];
    
    
    [[[ExceptionHandler alloc] init]
     
     performSelectorOnMainThread:@selector(handleException:)
     
     withObject:
     
     [NSException
      
      exceptionWithName:ExceptionHandlerSignalExceptionName
      
      reason:
      
      [NSString stringWithFormat:
       
       NSLocalizedString(@"Signal %d was raised.", nil),
       
       signal]
      
      userInfo:
      
      [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:ExceptionHandlerSignalKey]]
     
     waitUntilDone:YES];
    
}


void InstallUncaughtExceptionHandler(void){
    
    NSSetUncaughtExceptionHandler(&HandleException);
    
    signal(SIGABRT, SignalHandler);
    
    signal(SIGILL, SignalHandler);
    
    signal(SIGSEGV, SignalHandler);
    
    signal(SIGFPE, SignalHandler);
    
    signal(SIGBUS, SignalHandler);
    
    signal(SIGPIPE, SignalHandler);
    
}