//
//  APIClient.m
//  Juick
//
//  Created by Vitaly Takmazov on 22/08/16.
//  Copyright © 2016 com.juick. All rights reserved.
//
#import "APIClient.h"
#import "Message.h"
#import "Chat.h"

@interface APIClient()
@property(nonatomic, strong) NSOperationQueue *backgroundQueue;
@end

@implementation APIClient

+(APIClient *) sharedClient {
    static APIClient *sharedAPIClient = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedAPIClient = [[self alloc] init];
    });
    return sharedAPIClient;
}

-(id)init {
    if (self = [super init]) {
        NSString *baseURLString = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"base_url"];
        NSLog(@"Initializing with %@ base URL", baseURLString);
        self.manager = [[AFHTTPSessionManager alloc] initWithBaseURL:[NSURL URLWithString:baseURLString]];
        self.manager.requestSerializer = [AFJSONRequestSerializer new];
        [self.manager.requestSerializer setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
        NSString *username = [SAMKeychain passwordForService:[[NSBundle mainBundle] bundleIdentifier] account:@"com.juick.username"];
        if (username) {
            [self.manager.requestSerializer setAuthorizationHeaderFieldWithUsername:username password:[SAMKeychain passwordForService:[[NSBundle mainBundle] bundleIdentifier] account:@"com.juick.password"]];
        }
        self.backgroundQueue = [NSOperationQueue new];
        self.dateFormatter = [[NSDateFormatter alloc] init];
        self.dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
        [self.dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
    }
    return self;
}

-(void) pullNextFromPath:(NSString *)path  params:(NSDictionary *) params callback:(void(^)(NSArray *, NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    [self.backgroundQueue addOperationWithBlock:^{
        [manager GET:path parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSMutableArray *messages = [NSMutableArray new];
            [((NSArray *)responseObject) enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                [messages addObject:[Message fromJSON:obj]];
            }];
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(messages, nil);
            }];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"REST Error: %@", error);
            NSInteger statusCode = ((NSHTTPURLResponse *)task.response).statusCode;
            if (statusCode == 401) {
                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                    callback(nil, [[NSError alloc] initWithDomain:@"JuickErrorDomain" code:401 userInfo:nil]);
                }];
            }
        }];
    }];
}

-(void) postMessage:(NSString *)text result:(void (^)(Message *, NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    [self.backgroundQueue addOperationWithBlock:^{
        [manager POST:@"post" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            [formData appendPartWithFormData:[text dataUsingEncoding:NSUTF8StringEncoding] name:@"body"];
        } progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSLog(@"Success!");
            Message *result = [Message fromJSON:responseObject];
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(result, nil);
            }];
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"Error: %@", [error localizedDescription]);
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(nil, error);
            }];
        }];
    }];
}

-(void) postReplyToThread:(NSNumber *)mid inReplyTo:(NSNumber *)rid text:(NSString *)text result:(void(^)(Message *, NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    [self.backgroundQueue addOperationWithBlock:^{
        [manager POST:@"comment" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            [formData appendPartWithFormData:[[mid stringValue] dataUsingEncoding:NSUTF8StringEncoding] name:@"mid"];
            [formData appendPartWithFormData:[[NSString stringWithFormat:@"%d", [rid intValue]] dataUsingEncoding:NSUTF8StringEncoding] name:@"rid"];
            [formData appendPartWithFormData:[text dataUsingEncoding:NSUTF8StringEncoding] name:@"body"];
        } progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSLog(@"Success!");
            Message *reply = [Message fromJSON:responseObject];
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(reply, nil);
            }];
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"Error: %@", [error localizedDescription]);
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(nil, error);
            }];
        }];
    }];
}
-(void) postPMToUser:(NSString *)uname text:(NSString *)text result:(void (^)(NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    [self.backgroundQueue addOperationWithBlock:^{
        [manager POST:@"pm" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            [formData appendPartWithFormData:[text dataUsingEncoding:NSUTF8StringEncoding] name:@"body"];
            [formData appendPartWithFormData:[uname dataUsingEncoding:NSUTF8StringEncoding] name:@"uname"];
        } progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(nil);
            }];
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"Error: %@", [error localizedDescription]);
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(error);
            }];
        }];
    }];
}

-(void) fetchChats:(void (^)(NSArray *, NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    [self.backgroundQueue addOperationWithBlock:^{
        [manager GET:@"groups_pms" parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSMutableArray *groups = [NSMutableArray new];
            NSArray *pms = [(NSDictionary *)responseObject objectForKey:@"pms"];
            [pms enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                [groups addObject:[Chat fromJSON:obj]];
            }];
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(groups, nil);
            }];
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"Error: %@", [error localizedDescription]);
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(nil, error);
            }];
        }];
    }];
}
-(void) fetchChatWithUser:(NSString *)uname callback:(void (^)(NSArray *, NSError *))callback {
    AFHTTPSessionManager *manager = [APIClient sharedClient].manager;
    NSDictionary *params = @{@"uname": uname};
    [self.backgroundQueue addOperationWithBlock:^{
        [manager GET:@"pm" parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSMutableArray *messages = [NSMutableArray new];
            NSArray *messagesList = (NSArray *)responseObject;
            [messagesList enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                [messages addObject:[Message fromJSON:obj]];
            }];
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(messages, nil);
            }];
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"Error: %@", [error localizedDescription]);
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                callback(nil, error);
            }];
        }];
    }];
}


+(NSString *) messagesUrl {
    return @"messages";
}

+(NSString *) discussionsUrl {
    return @"messages/discussions";
}

+(NSString *) threadUrl {
    return @"thread";
}

+(NSString *) feedUrl {
    return @"home";
}

@end