//
//  RAUploadManager.m
//  test_autolayout
//
//  Created by Ray on 02/05/2017.
//  Copyright © 2017 USAI. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "RAUploadManager.h"
#import "NetworkUtils.h"
#import "RAUtils.h"

NSString *const kUploadSetting = @"UploadSettingKey";

@interface RAUploadManager ()

@property (nonatomic,strong) NSTimer *retryTimer;
@property (nonatomic,strong) NSMutableArray<RAUploadOperation *> *retryArr;

@end

@implementation RAUploadManager


/*!
 * Called by Reachability whenever status changes.
 */
- (void) reachabilityChanged:(NSNotification *)note
{
    [self handleReachability:self.reach];
}

- (void)handleReachability:(Reachability *)reachability {
    
    NetworkStatus netStatus = [reachability currentReachabilityStatus];
    
    if (self.onlyWiFi && netStatus != ReachableViaWiFi) {
        DebugLog(@"not wifi & stop task");
        [self.retryArr removeAllObjects];
        [self stopAllTasks];
    }
}

- (instancetype)init {
    if (self = [super init]) {
        
        
        /*
         Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the method reachabilityChanged will be called.
         */
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
        
        NSString *remoteHostName = @"www.apple.com";
        self.reach = [Reachability reachabilityWithHostName:remoteHostName];
        [self.reach startNotifier];
        [self handleReachability:self.reach];
        
        self.queue_status = QueueStatusDefault;
        
        

        
        NSDictionary *param = [[NSUserDefaults standardUserDefaults] objectForKey:kUploadSetting];
        if (param) {
            BOOL autoUpload = [[param objectForKey:@"auto_upload"] boolValue];
            BOOL autoRmFinish = [[param objectForKey:@"auto_rm_finish"] boolValue];
            BOOL autoRmErr = [[param objectForKey:@"auto_rm_error"] boolValue];
            BOOL onlyWiFi = [[param objectForKey:@"only_wifi"] boolValue];
            int retryCount = [[param objectForKey:@"retry_count"] intValue];
            NSNumber *timeInterval = [param objectForKey:@"retry_time_interval"];
            if (timeInterval != nil) {
                self.retryTimeInterval = [timeInterval intValue];
            } else {
                self.retryTimeInterval = 300;
            }
            self.autoStart = autoUpload;
//            self.removeFinish = autoRmFinish;
//            self.removeError = autoRmErr;
            self.maxRetry = retryCount;
            self.onlyWiFi = onlyWiFi;
        } else {
            self.autoStart = YES;
//            self.removeFinish = YES;
//            self.removeError = NO;
            self.maxRetry = 5;
            self.onlyWiFi = NO;
            self.retryTimeInterval = 300;
        }

        
       

        self.newtaskStatus = TaskStatusWait;
        self.maxThread = 3;
//        self.autoStart = true;
//        self.removeError=true;
//        self.removeFinish = true;
        
        self.operation_queue = [NSOperationQueue new];
        self.operation_queue.maxConcurrentOperationCount = self.maxThread;
        
        
        [self.operation_queue addObserver:self
                               forKeyPath:@"operationCount"
                                  options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)
                                  context:@"queueFinished changed"];
        
        
        //load task 要在监听arr_queue之前
        [self loadTasks];
        
        
        [self addObserver:self
                                    forKeyPath:@"arr_queue"
                                       options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)
                                       context:@"arr_queue changed"];
//        self.arr_queue_lock = [NSLock new];
        
//        [self.arr_queue_lock lock];
//        [self.arr_queue_lock lock];
//        [self.arr_queue_lock unlock];
//        [self.arr_queue_lock unlock];
        
        
//        self.backgroundColor = [UIColor clearColor];
    }
    return self;
}





-(void) dealloc
{

    [self destructRetryTimer];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
    [self.operation_queue removeObserver:self forKeyPath:@"operationCount"];
    [self.operation_queue removeObserver:self forKeyPath:@"arr_queue"];
    
}


- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    
    if([keyPath isEqualToString:@"operationCount"])
    {

//        [self checkRetryOperations];
        
        if(self.operation_queue.operationCount == 0 && self.retryArr.count == 0)
        {
            for(NSMutableDictionary* task in self.arr_queue)
            {
                if([task[@"status"] intValue] == TaskStatusError)
                {
                    self.queue_status = QueueStatusFinishWithError;
                    return;
                }
            }
            self.queue_status = QueueStatusFinish;
        }
    }
    if([keyPath isEqualToString:@"arr_queue"])
    {
        NSArray* newqueue=[change objectForKey:NSKeyValueChangeNewKey];
        NSArray* oldqueue=[change objectForKey:NSKeyValueChangeOldKey];
        if([newqueue isKindOfClass:[NSNull class]])
            newqueue=nil;
        if([oldqueue isKindOfClass:[NSNull class]])
            oldqueue=nil;
        if(newqueue.count>oldqueue.count)
        {
            self.queue_status = QueueStatusAdd;
            return;
        }
    }
    
}

//-(void) upload:(NSString*) url
//{
//    while(self.activeThread<self.maxThread)
//    {
//        bool nomore=false;
//        for(int i=0;i<self.arr_queue.count;i++)
//        {
//            NSMutableDictionary* task = self.arr_queue[i];
//            
//            TaskStatus ts=[task[@"status"] intValue];
//            if (ts==TaskStatusWait) {
//                self.activeThread--;
//                [self uploadTask:task url:url];
//                break;
//            }
//            if(i==self.arr_queue.count-1)
//                nomore=true;
//
//        }
//        if(nomore)
//            break;
//    }
//}
-(void) addTask:(NSMutableDictionary*) task
{
    
//    [self.arr_queue addObject:task];
   
//    [self.arr_queue_lock lock];
//    [[self mutableArrayValueForKey:@"arr_queue"] addObject:task];
//    [self.arr_queue_lock unlock];
    
    @synchronized(self) {
//        [[self mutableArrayValueForKey:@"arr_queue"] addObject:task];
        
        [[self mutableArrayValueForKey:@"arr_queue"] insertObject:task atIndex:0];
    }
    
    if(self.newtaskStatus==TaskStatusWait)
    {
        
        [self startTask:task];

        
    }
//    self.queue_status = QueueStatusAdd;
    
}
-(void) addTasks:(NSMutableArray*) tasks
{
//    [self.arr_queue_lock lock];
//    [[self mutableArrayValueForKey:@"arr_queue"] addObjectsFromArray:tasks];
//    [self.arr_queue_lock unlock];
    
    @synchronized(self) {
//        [[self mutableArrayValueForKey:@"arr_queue"] addObjectsFromArray:tasks];
        
        
//        NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange([self mutableArrayValueForKey:@"arr_queue"].count,tasks.count )];
        
                NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0,tasks.count )];
        [[self mutableArrayValueForKey:@"arr_queue"] insertObjects:tasks atIndexes:indexSet];
    }
    
    if(self.newtaskStatus==TaskStatusWait)
    {
        for(NSMutableDictionary* task in tasks)
            [self startTask:task];
        
        
    }
   
//    self.queue_status = QueueStatusAdd;
}

-(void) removeTasks:(NSMutableArray*) tasks
{
    
    
    for(NSMutableDictionary* task in tasks)
    {
        
        [self stopTask:task];
        // 文件上传成功才移除文件
//        NSFileManager* fmanager = [NSFileManager new];
//        NSError* error = nil;
//        bool bdel=[fmanager removeItemAtPath:[self filePath:task] error:&error];
//        if(!bdel)
//            DebugLog(@"file delete failed path:%@",[self filePath:task]);
    }
    
    
    
//    [self.arr_queue_lock lock];
//    [[self mutableArrayValueForKey:@"arr_queue"] removeObjectsInArray:tasks];
//    [self.arr_queue_lock unlock];
    
    @synchronized(self) {
//        [[self mutableArrayValueForKey:@"arr_queue"] removeObjectsInArray:tasks];
        
//        NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange([self mutableArrayValueForKey:@"arr_queue"].count,tasks.count )];
        
        NSIndexSet *indexSet = [self.arr_queue indexesOfObjectsPassingTest:^BOOL(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
                                            {
                                                return [tasks containsObject:obj];
                                                //                return [tasks indexOfObject:obj];
                                            }];
//        [NSIndexSet new];
//        for(NSMutableDictionary* task in tasks)
//        {
//
//            [self.arr_queue indexOfObject:task];
//            indexSet set
//        }
        
        [[self mutableArrayValueForKey:@"arr_queue"] removeObjectsAtIndexes:indexSet];
//        -removeObjectFrom<Key>AtIndex
//        [ insertObjects:tasks atIndexes:indexSet];
    }
    
//    if (self.delegate && [self.delegate respondsToSelector:@selector(uploadManager:didRemoveTasks:)]) {
//        [self.delegate uploadManager:self didRemoveTasks:tasks];
//    }
}

-(void) removeTask:(NSMutableDictionary*) task
{
    
    //    [self.arr_queue addObject:task];
    
    
    [self stopTask:task];
    // 上传成功才删除文件
//    NSFileManager* fmanager = [NSFileManager new];
//    NSError* error = nil;
//    bool bdel=[fmanager removeItemAtPath:[self filePath:task] error:&error];
//    if(!bdel)
//        DebugLog(@"file delete failed path:%@",[self filePath:task]);
    

//    [self.arr_queue_lock lock];
//    DebugLog(@"lock");
//    [[self mutableArrayValueForKey:@"arr_queue"] removeObject:task];
//    DebugLog(@"unlock");
//    [self.arr_queue_lock unlock];

//    [self.arr_queue_lock lock];
//    [[self mutableArrayValueForKey:@"arr_queue"] removeObject:task];
//    [self.arr_queue_lock unlock];
    
    
    @synchronized(self) {
        [[self mutableArrayValueForKey:@"arr_queue"] removeObject:task];
    }


//    if (self.delegate && [self.delegate respondsToSelector:@selector(uploadManager:didRemoveTasks:)]) {
//        [self.delegate uploadManager:self didRemoveTasks:@[task]];
//    }
    
    

}


//-(NSString*)filePath:(NSMutableDictionary*)task
//{
//    
//    NSString *path = [RAUtils appCacheDirectory];
//    path= [path stringByAppendingPathComponent:task[@"path"]];
//    path= [path stringByAppendingPathComponent:task[@"file"]];
//    return path;
//}
-(void) saveTasks
{
    NSUserDefaults *defaults =[NSUserDefaults standardUserDefaults];
    [defaults setObject:self.arr_queue forKey:@"upload_queue"];
    [defaults synchronize];
}
-(void) loadTasks
{
    [self stopAllTasks];
    self.arr_queue = [NSMutableArray new];
    NSMutableArray* arr = [[[NSUserDefaults standardUserDefaults] objectForKey:@"upload_queue"] mutableCopy];
//    if(arr==nil)
    
    
    for(NSDictionary* task in arr)
    {
        NSMutableDictionary* newtask =[task mutableCopy];
        [self.arr_queue addObject:newtask];
        if(self.autoStart&&[task[@"status"] intValue]!=TaskStatusError&&[task[@"status"] intValue]!=TaskStatusFinish)
            [self startTask:newtask];
    }
    
//    NSDictionary* ddd = arr[0] ;
//    NSMutableDictionary* eee = [ddd mutableCopy];
//    
//    eee=[NSMutableDictionary dictionaryWithDictionary:ddd];
//    if(arr!=nil)
//        self.arr_queue=arr;
//    else
//        self.arr_queue= [[NSMutableArray alloc] init];
//    
//    for(__strong NSMutableDictionary* task in arr)
//    {
//        
//        task=[NSMutableDictionary dictionaryWithDictionary:task];
////        if([task[@"status"] intValue]==TaskStatusStart)
////            task[@"status"]=[NSNumber numberWithInteger:TaskStatusWait];
//      //  NSMutableDictionary *new_task = [task mutableCopy];
//        if(self.autoStart&&[task[@"status"] intValue]!=TaskStatusError&&[task[@"status"] intValue]!=TaskStatusFinish)
//           [self startTask:task];
//    }
    
    
}
-(void) stopAllTasks
{
    for(NSMutableDictionary* task in self.arr_queue)
    {
        
        [self stopTask:task];
    }
    
}
-(void) stopTask:(NSMutableDictionary*) task
{
    
    if([task[@"status"] intValue]!=TaskStatusStart&&[task[@"status"] intValue]!=TaskStatusWait)
    {
         task[@"operation"]=nil;
        return; // task 已停止，返回
    }
    
    DebugLog(@"stop task");
    RAUploadOperation* operation = task[@"operation"];
    [operation cancel];
    task[@"operation"]=nil;
    task[@"status"] = [NSNumber numberWithInt:TaskStatusStop] ;
    task[@"progress"] = [NSNumber numberWithDouble:0.0];
    
    
}  
-(void) startAllTasks
{

        
    for(NSMutableDictionary* task in self.arr_queue)
        [self startTask:task];

}
-(void) startTask:(NSMutableDictionary*) task
{
    if (self.onlyWiFi && self.reach.currentReachabilityStatus != ReachableViaWiFi) {
        return;
    }
    /*__block*/ NSMutableDictionary* block_task = task;
    __weak typeof(self) weakSelf = self;

    if([task[@"status"] intValue]==TaskStatusStart||[task[@"status"] intValue]==TaskStatusWait)
        return; // task 已在执行队列，返回
    
        RAUploadOperation* operation = [[RAUploadOperation alloc] initWithTaskinfo:task retry:self.maxRetry];
    [operation setCompletionBlock:^{
        switch ([block_task[@"status"] intValue]) {
            case TaskStatusFinish:
            {
//                if(weakSelf.removeFinish)
//                   [self removeTask:block_task];
            }
                break;
            case TaskStatusError:
            {
//                if(weakSelf.removeError)
//                    [self removeTask:block_task];
            }
                break;
            default:
                break;
        }
        
    }];

    task[@"msg"] = nil;
        task[@"operation"] = operation;
        task[@"status"] = [NSNumber numberWithInt:self.newtaskStatus] ;
        [self.operation_queue addOperation:operation];
    
        
}
//- (void) uploadTask:(NSMutableDictionary*) task url:(NSString*)url{
//    
////    __weak typeof(self) weakself = self;
//    
//    
//  
//    
//}

- (BOOL)canUpload {
    if (self.onlyWiFi && self.reach.currentReachabilityStatus != ReachableViaWiFi) {
        return NO;
    }
    return YES;
}

#pragma mark - Retry

- (NSMutableArray<RAUploadOperation *> *)retryArr {
    if (!_retryArr) {
        _retryArr = [NSMutableArray array];
    }
    return _retryArr;
}

- (void)addRetryOperation:(RAUploadOperation *)operation {
    if (self.retryTimer == nil) {
//        self.retryTimer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(checkRetryOperations) userInfo:nil repeats:YES];
        self.retryTimer = [NSTimer timerWithTimeInterval:60 target:self selector:@selector(checkRetryOperations) userInfo:nil repeats:YES];
        [[NSRunLoop mainRunLoop] addTimer:self.retryTimer forMode:NSRunLoopCommonModes];
    }
    [self.retryArr addObject:operation];
    
    // 升序
    [self.retryArr sortUsingComparator:^NSComparisonResult(RAUploadOperation* _Nonnull operation1, RAUploadOperation*  _Nonnull opertation2) {
        
        if (operation1.theRestOfWaitTimeInterval < opertation2.theRestOfWaitTimeInterval) {
            return NSOrderedAscending;
        } else {
            return NSOrderedDescending;
        }
        
    }];
}

- (void)checkRetryOperations {
    
    // 检查是否有需要重试的任务
    if (self.retryArr.count == 0) {
        return;
    }
    // 检查Wi-Fi Only
    if (![self canUpload]) {
        return;
    }
    
    NSMutableArray<RAUploadOperation *> *nextStartOperations = [NSMutableArray array];
//    // 检查当前上传队列等待数量是否小于最大并发数
//    if (self.operation_queue.operationCount < self.maxThread) {
//
////        // 根据最大并发数将剩余Operation全部添加进去
////        NSInteger minCount = MIN(self.retryArr.count, self.maxThread - self.operation_queue.operationCount);
//        for (int i = 0; i < self.retryArr.count; i++) {
//            RAUploadOperation *operation = [self.retryArr objectAtIndex:i];
//            operation.queuePriority = NSOperationQueuePriorityVeryHigh;
//            [self.operation_queue addOperation:operation];
//            [nextStartOperations addObject:operation];
//        }
//
//    } else {
        // 调度等待时间到达的Operation
        __weak typeof(self) weakSelf = self;
        
        [self.retryArr enumerateObjectsUsingBlock:^(RAUploadOperation * _Nonnull operation, NSUInteger idx, BOOL * _Nonnull stop) {
            
            if (operation.theRestOfWaitTimeInterval <= 0) {
                operation.queuePriority = NSOperationQueuePriorityVeryHigh;
                [weakSelf.operation_queue addOperation:operation];
                [nextStartOperations addObject:operation];
            }
            
        }];
//    }
    
    
    
    [self.retryArr removeObjectsInArray:nextStartOperations];
    
//    if (self.retryArr.count == 0) {
//        [self destructRetryTimer];
//    }
    
}

- (void)destructRetryTimer {
    if (self.retryTimer != nil) {
        [self.retryTimer setFireDate:[NSDate distantFuture]];
        [self.retryTimer invalidate];
        self.retryTimer = nil;
    }
}

@end