/*
 * Copyright 2017 Google
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "FirebaseDatabase/Tests/Helpers/FTestHelpers.h"

#import "FirebaseAuth/Interop/FIRAuthInterop.h"
#import "FirebaseCore/Extension/FirebaseCoreInternal.h"

#import "FirebaseDatabase/Sources/Api/Private/FIRDatabase_Private.h"
#import "FirebaseDatabase/Sources/Constants/FConstants.h"
#import "FirebaseDatabase/Sources/FIRDatabaseConfig_Private.h"

#import "SharedTestUtilities/AppCheckFake/FIRAppCheckFake.h"
#import "SharedTestUtilities/AppCheckFake/FIRAppCheckTokenResultFake.h"
#import "SharedTestUtilities/FIRAuthInteropFake.h"

@implementation FTestHelpers

+ (NSTimeInterval)waitUntil:(BOOL (^)(void))predicate timeout:(NSTimeInterval)seconds {
  NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
  NSDate *timeoutDate = [NSDate dateWithTimeIntervalSinceNow:seconds];
  NSTimeInterval timeoutTime = [timeoutDate timeIntervalSinceReferenceDate];
  NSTimeInterval currentTime;

  for (currentTime = [NSDate timeIntervalSinceReferenceDate];
       !predicate() && currentTime < timeoutTime;
       currentTime = [NSDate timeIntervalSinceReferenceDate]) {
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                             beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.25]];
  }

  NSTimeInterval finish = [NSDate timeIntervalSinceReferenceDate];

  NSAssert(currentTime <= timeoutTime, @"Timed out");

  return (finish - start);
}

+ (FIRDatabaseConfig *)defaultConfig {
  return [self configForName:@"default"];
}

+ (FIRDatabaseConfig *)configForName:(NSString *)name {
  id<FIRAuthInterop> auth = [[FIRAuthInteropFake alloc] initWithToken:nil userID:nil error:nil];
  id<FIRAppCheckInterop> appCheck = [[FIRAppCheckFake alloc] init];
  id<FIRDatabaseConnectionContextProvider> contextProvider =
      [FIRDatabaseConnectionContextProvider contextProviderWithAuth:auth appCheck:appCheck];
  return [[FIRDatabaseConfig alloc] initWithSessionIdentifier:name
                                                  googleAppID:@"fake-app-id"
                                              contextProvider:contextProvider];
}

+ (NSString *)databaseURL {
  FIROptions *options = [FIROptions defaultOptions];
  if (options && ![options.databaseURL isEqualToString:@"https://abc-xyz-123.firebaseio.com"]) {
    return options.databaseURL;
  }
  // If no custom GoogleServices.plist is provided, we default to the Emulator URL.
  return @"http://localhost:9000";
}

+ (FIRDatabase *)databaseForConfig:(FIRDatabaseConfig *)config {
  FParsedUrl *parsedUrl = [FUtilities parseUrl:[FTestHelpers databaseURL]];
  return [FIRDatabase createDatabaseForTests:parsedUrl.repoInfo config:config];
}

+ (FIRDatabase *)defaultDatabase {
  static FIRDatabase *database = nil;
  if (database == nil) {
    database = [FTestHelpers databaseForConfig:[self defaultConfig]];
  }
  return database;
}

+ (NSArray *)getRandomNodes:(int)num persistence:(BOOL)persistence {
  static dispatch_once_t pred = 0;
  static NSMutableArray *persistenceRefs = nil;
  static NSMutableArray *noPersistenceRefs = nil;
  dispatch_once(&pred, ^{
    persistenceRefs = [[NSMutableArray alloc] init];
    noPersistenceRefs = [[NSMutableArray alloc] init];
    // Uncomment the following line to run tests against a background thread
    //[Firebase setDispatchQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
  });

  NSMutableArray *refs = (persistence) ? persistenceRefs : noPersistenceRefs;

  while (num > refs.count) {
    NSString *sessionIdentifier =
        [NSString stringWithFormat:@"test-config-%@persistence-%lu", (persistence) ? @"" : @"no-",
                                   (unsigned long)refs.count];
    FIRDatabaseConfig *config = [self configForName:sessionIdentifier];
    config.persistenceEnabled = persistence;
    FIRDatabaseReference *ref = [[self databaseForConfig:config] reference];
    [refs addObject:ref];
  }

  NSMutableArray *results = [[NSMutableArray alloc] init];
  NSString *name = nil;
  for (int i = 0; i < num; ++i) {
    FIRDatabaseReference *ref = [refs objectAtIndex:i];
    if (!name) {
      name = [ref childByAutoId].key;
    }
    [results addObject:[ref child:name]];
  }
  return results;
}

// Helpers
+ (FIRDatabaseReference *)getRandomNode {
  NSArray *refs = [self getRandomNodes:1 persistence:YES];
  return [refs objectAtIndex:0];
}

+ (FIRDatabaseReference *)getRandomNodeWithoutPersistence {
  NSArray *refs = [self getRandomNodes:1 persistence:NO];
  return refs[0];
}

+ (FTupleFirebase *)getRandomNodePair {
  NSArray *refs = [self getRandomNodes:2 persistence:YES];

  FTupleFirebase *tuple = [[FTupleFirebase alloc] init];
  tuple.one = [refs objectAtIndex:0];
  tuple.two = [refs objectAtIndex:1];

  return tuple;
}

+ (FTupleFirebase *)getRandomNodePairWithoutPersistence {
  NSArray *refs = [self getRandomNodes:2 persistence:NO];

  FTupleFirebase *tuple = [[FTupleFirebase alloc] init];
  tuple.one = refs[0];
  tuple.two = refs[1];

  return tuple;
}

+ (FTupleFirebase *)getRandomNodeTriple {
  NSArray *refs = [self getRandomNodes:3 persistence:YES];
  FTupleFirebase *triple = [[FTupleFirebase alloc] init];
  triple.one = [refs objectAtIndex:0];
  triple.two = [refs objectAtIndex:1];
  triple.three = [refs objectAtIndex:2];

  return triple;
}

+ (id<FNode>)leafNodeOfSize:(NSUInteger)size {
  NSMutableString *string = [NSMutableString string];
  NSString *pattern = @"abdefghijklmopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  for (NSUInteger i = 0; i < size - pattern.length; i = i + pattern.length) {
    [string appendString:pattern];
  }
  NSUInteger remainingLength = size - string.length;
  [string appendString:[pattern substringToIndex:remainingLength]];
  return [FSnapshotUtilities nodeFrom:string];
}

@end