//
//  MyMQTT.m
//  myWear
//
//  Created by xTT on 2017/2/24.
//  Copyright © 2017年 xTT. All rights reserved.
//

#import "MyMQTT.h"
#import "User.h"

@interface MyMQTT(){
    NSMutableArray *mqttMsgArr;
}

@end

@implementation MyMQTT

+ (instancetype)sharedClient
{
    static MyMQTT *client = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        client = [[MyMQTT alloc] init];
        [client.manager connectToLast];
    });
    return client;
}

- (MQTTSessionManager *)manager{
    if (!_manager) {
        mqttMsgArr = [[NSMutableArray alloc] init];
        
        _manager = [[MQTTSessionManager alloc] init];
        _manager.delegate = self;
        [self connectMqtt];
        
        [_manager addObserver:self
                   forKeyPath:@"state"
                      options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
                      context:nil];
    }
    return _manager;
}

- (void)connectMqtt{
    if (cUser.openid.length > 0 &&
        (_manager.state == MQTTSessionManagerStateClosed || _manager.state == MQTTSessionManagerStateClosing || _manager.state == MQTTSessionManagerStateStarting)) {
        NSString *clientId = [NSString stringWithFormat:@"%@@@@%@",self.mqttSettings[@"groupId"],
                              [[User currentUser].openid substringToIndex:13]];
        
        [_manager connectTo:self.mqttSettings[@"host"]
                       port:[self.mqttSettings[@"port"] intValue]
                        tls:[self.mqttSettings[@"tls"] boolValue]
                  keepalive:60  //心跳间隔不得大于120s
                      clean:true
                       auth:true
                       user:self.mqttSettings[@"accessKey"]
                       pass:self.mqttSettings[@"passWord"]
                       will:false
                  willTopic:nil
                    willMsg:nil
                    willQos:MQTTQosLevelAtLeastOnce
             willRetainFlag:FALSE
               withClientId:clientId
             securityPolicy:nil
               certificates:nil
              protocolLevel:MQTTProtocolVersion31];
    }
}

- (void)setSubscriptions:(id)obj{
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    if (cUser.openid.length > 0) {
        NSString *userTopic = [NSString stringWithFormat:@"%@/user/%@",self.mqttSettings[@"rootTopic"],cUser.openid];
        
        dic = [NSMutableDictionary dictionaryWithDictionary:@{userTopic:@(MQTTQosLevelAtLeastOnce)}];
    }
    
    if ([obj isKindOfClass:[Circle class]]) {
        NSString *chatTopic = [NSString stringWithFormat:@"%@/chatGroup/%@",self.mqttSettings[@"rootTopic"],[obj groupid]];
        [dic addEntriesFromDictionary:@{chatTopic:@(MQTTQosLevelAtLeastOnce)}];
    }
    _manager.subscriptions = dic;
    if (cUser.openid.length > 0) {
        [self connectMqtt];
    }else{
        [_manager disconnect];
    }
}


- (NSDictionary *)mqttSettings{
    if (!_mqttSettings) {
        NSURL *bundleURL = [[NSBundle mainBundle] bundleURL];
        NSURL *mqttPlistUrl = [bundleURL URLByAppendingPathComponent:@"mqtt.plist"];
        _mqttSettings = [NSDictionary dictionaryWithContentsOfURL:mqttPlistUrl];
    }
    return _mqttSettings;
}

- (void)sendMsg:(NSString *)msg circle:(Circle *) circle{
    NSString *chatTopic = [NSString stringWithFormat:@"%@/chatGroup/%@",self.mqttSettings[@"rootTopic"],[circle groupid]];
    [self.manager sendData:[msg dataUsingEncoding:NSUTF8StringEncoding]
                     topic:[NSString stringWithFormat:@"%@/%@",chatTopic,@"IOS"]//此处设置多级子topic
                       qos:MQTTQosLevelAtLeastOnce
                    retain:FALSE];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    switch (self.manager.state) {
        case MQTTSessionManagerStateClosed:
//            self.status.text = @"closed";
//            self.disconnect.enabled = false;
//            self.connect.enabled = false;
            break;
        case MQTTSessionManagerStateClosing:
//            self.status.text = @"closing";
//            self.disconnect.enabled = false;
//            self.connect.enabled = false;
            break;
        case MQTTSessionManagerStateConnected:
//            self.status.text = [NSString stringWithFormat:@"connected as %@",
//                                self.clientId];
//            self.disconnect.enabled = true;
//            self.connect.enabled = false;
            break;
        case MQTTSessionManagerStateConnecting:
//            self.status.text = @"connecting";
//            self.disconnect.enabled = false;
//            self.connect.enabled = false;
            break;
        case MQTTSessionManagerStateError:
//            self.status.text = @"error";
//            self.disconnect.enabled = false;
//            self.connect.enabled = false;
            break;
        case MQTTSessionManagerStateStarting:
        default:
//            self.status.text = @"not connected";
//            self.disconnect.enabled = false;
//            self.connect.enabled = true;
            break;
    }
}

/*
 * MQTTSessionManagerDelegate
 */
- (void)handleMessage:(NSData *)data onTopic:(NSString *)topic retained:(BOOL)retained {
    /*
     * MQTTClient: process received message
     */
    NSString *dataString = [[NSString alloc] initWithData:data
                                                 encoding:NSUTF8StringEncoding];
    
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data
                                                        options:NSJSONReadingMutableLeaves
                                                          error:nil];
    
    xLog(@"mqtt %d %@ %@",retained,topic,dic);
    
    if (dic && ![mqttMsgArr containsObject:dataString]) {
        [mqttMsgArr addObject:dataString];
        [[NSNotificationCenter defaultCenter] postNotificationName:dic[@"type"]
                                                            object:dic];

        if (mqttMsgArr.count > 50) {
            [mqttMsgArr removeObjectAtIndex:0];
        }
    }
}

- (NSString *)macSignWithText:(NSString *)text secretKey:(NSString *)secretKey
{
    NSData *saltData = [secretKey dataUsingEncoding:NSUTF8StringEncoding];
    NSData *paramData = [text dataUsingEncoding:NSUTF8StringEncoding];
    NSMutableData* hash = [NSMutableData dataWithLength:CC_SHA1_DIGEST_LENGTH ];
    CCHmac(kCCHmacAlgSHA1, saltData.bytes, saltData.length, paramData.bytes, paramData.length, hash.mutableBytes);
    NSString *base64Hash = [hash base64EncodedStringWithOptions:0];
    
    return base64Hash;
}
@end