//
//  DropboxV2ObjC.m
//  FMC Planner 2
//
//  Created by Kilian Hofmann on 29.03.16.
//  Copyright © 2016 Kilian Hofmann. All rights reserved.
//

#import "DropboxV2ObjC.h"

@implementation DropboxV2ObjC

- (DropboxV2ObjC *)init {
    self = [super init];
    self.rootDirectory = @"/Apps/FMC Planner 2/";
    self.kJSONNullObject = [@"null" dataUsingEncoding:NSASCIIStringEncoding];
    self.kDropboxProtectionSpace =
        [[NSURLProtectionSpace alloc] initWithHost:@"dropbox"
                                              port:443
                                          protocol:@"HTTP"
                                             realm:nil
                              authenticationMethod:@"OAuth2"];
    return self;
}

#pragma mark - OAuth stuff

- (BOOL)authorizeUserWithToke:(NSURL *)token
                   completion:(void (^)(void))handler {
    NSScanner *scan = [NSScanner scannerWithString:token.absoluteString];
    NSString *error = [[NSString alloc] init];
    [scan scanUpToString:@"&error=" intoString:&error];
    if (![error isEqualToString:token.absoluteString]) {
        handler();
        return false;
    }

    // No error, refine token
    NSString *tokenUnrefined = [[NSString alloc] init];
    scan = [NSScanner scannerWithString:token.absoluteString];
    [scan scanUpToString:@"&" intoString:&tokenUnrefined];
    NSString *tokenRefined = [tokenUnrefined substringFromIndex:21];
    _token = tokenRefined;
    NSURLCredential *credential = [NSURLCredential
        credentialWithUser:@"Dropbox"
                  password:_token
               persistence:NSURLCredentialPersistencePermanent];
    [[NSURLCredentialStorage sharedCredentialStorage]
             setCredential:credential
        forProtectionSpace:_kDropboxProtectionSpace];
    handler();
    return true;
}

- (BOOL)deauthorizeUser {
    NSDictionary *credentials =
        [[NSURLCredentialStorage sharedCredentialStorage]
            credentialsForProtectionSpace:_kDropboxProtectionSpace];
    NSURLCredential *credential = [credentials.objectEnumerator nextObject];
    [[NSURLCredentialStorage sharedCredentialStorage]
          removeCredential:credential
        forProtectionSpace:_kDropboxProtectionSpace];
    return true;
}

#pragma mark - File and directory operations

#pragma mark - Other operations

- (NSDictionary *)getUserInfo {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    request.URL =
        [NSURL URLWithString:
                   @"https://api.dropboxapi.com/2/users/get_current_account"];
    [request addValue:[NSString stringWithFormat:@"Bearer %@", _token]
                          .precomposedStringWithCanonicalMapping
        forHTTPHeaderField:(@"Authorization")
                               .precomposedStringWithCanonicalMapping];
    [request addValue:(@"application/json")
                          .precomposedStringWithCanonicalMapping
        forHTTPHeaderField:(@"Content-Type")
                               .precomposedStringWithCanonicalMapping];
    request.HTTPMethod = @"POST";
    request.HTTPBody = _kJSONNullObject;

    NSURLResponse *response = nil;
    NSError *error = nil;
    id data = [self parseJSON:[NSURLConnection sendSynchronousRequest:request
                                                    returningResponse:&response
                                                                error:&error]];
    if ([data isKindOfClass:[NSDictionary class]]) {
        return data;
    } else {
        return nil;
    }
}

#pragma mark - Helper methods

- (id)parseJSON:(NSData *)data {
    NSError *error = nil;
    id object =
        [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
    if (error == nil) {
        return object;
    } else {
        return
            [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
    }
}

@end