/**
 * Copyright (c) 2016-present Invertase Limited & Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this library 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 "RNFBFirestoreCommon.h"
#import <RNFBApp/RNFBSharedUtils.h>
#import "RNFBPreferences.h"

NSString *const FIRESTORE_CACHE_SIZE = @"firebase_firestore_cache_size";
NSString *const FIRESTORE_HOST = @"firebase_firestore_host";
NSString *const FIRESTORE_PERSISTENCE = @"firebase_firestore_persistence";
NSString *const FIRESTORE_SSL = @"firebase_firestore_ssl";
NSString *const FIRESTORE_SERVER_TIMESTAMP_BEHAVIOR =
    @"firebase_firestore_server_timestamp_behavior";

NSMutableDictionary *instanceCache;

@implementation RNFBFirestoreCommon
+ (FIRFirestore *)getFirestoreForApp:(FIRApp *)app databaseId:(NSString *)databaseId {
  if (instanceCache == nil) {
    instanceCache = [[NSMutableDictionary alloc] init];
  }
  NSString *firestoreKey = [RNFBFirestoreCommon createFirestoreKeyWithAppName:[app name]
                                                                   databaseId:databaseId];
  FIRFirestore *cachedInstance = instanceCache[firestoreKey];

  if (cachedInstance) {
    return cachedInstance;
  }

  FIRFirestore *instance = [FIRFirestore firestoreForApp:app database:databaseId];

  [self setFirestoreSettings:instance
                     appName:[RNFBSharedUtils getAppJavaScriptName:app.name]
                  databaseId:databaseId];

  instanceCache[firestoreKey] = instance;

  return instance;
}

+ (NSString *)createFirestoreKeyWithAppName:(NSString *)appName databaseId:(NSString *)databaseId {
  return [NSString stringWithFormat:@"%@:%@", appName, databaseId];
}

+ (dispatch_queue_t)getFirestoreQueue {
  static dispatch_queue_t firestoreQueue;
  static dispatch_once_t once;
  dispatch_once(&once, ^{
    firestoreQueue =
        dispatch_queue_create("io.invertase.firebase.firestore", DISPATCH_QUEUE_SERIAL);
  });
  return firestoreQueue;
}

+ (void)setFirestoreSettings:(FIRFirestore *)firestore
                     appName:(NSString *)appName
                  databaseId:(NSString *)databaseId {
  FIRFirestoreSettings *firestoreSettings = [[FIRFirestoreSettings alloc] init];
  RNFBPreferences *preferences = [RNFBPreferences shared];

  firestoreSettings.dispatchQueue = [self getFirestoreQueue];

  NSString *firestoreKey = [RNFBFirestoreCommon createFirestoreKeyWithAppName:appName
                                                                   databaseId:databaseId];

  NSString *cacheKey = [NSString stringWithFormat:@"%@_%@", FIRESTORE_CACHE_SIZE, firestoreKey];
  NSInteger size = [preferences getIntegerValue:cacheKey defaultValue:0];

  if (size == -1) {
    firestoreSettings.cacheSizeBytes = kFIRFirestoreCacheSizeUnlimited;
  } else if (size == 0) {
    firestoreSettings.cacheSizeBytes = firestore.settings.cacheSizeBytes;
  } else {
    firestoreSettings.cacheSizeBytes = size;
  }

  NSString *hostKey = [NSString stringWithFormat:@"%@_%@", FIRESTORE_HOST, firestoreKey];
  firestoreSettings.host = [preferences getStringValue:hostKey
                                          defaultValue:firestore.settings.host];

  NSString *persistenceKey =
      [NSString stringWithFormat:@"%@_%@", FIRESTORE_PERSISTENCE, firestoreKey];
  firestoreSettings.persistenceEnabled =
      (BOOL)[preferences getBooleanValue:persistenceKey
                            defaultValue:firestore.settings.persistenceEnabled];

  NSString *sslKey = [NSString stringWithFormat:@"%@_%@", FIRESTORE_SSL, firestoreKey];
  firestoreSettings.sslEnabled =
      (BOOL)[preferences getBooleanValue:sslKey defaultValue:firestore.settings.sslEnabled];

  firestore.settings = firestoreSettings;

  [preferences remove:cacheKey];
  [preferences remove:hostKey];
  [preferences remove:persistenceKey];
  [preferences remove:sslKey];
}

+ (FIRDocumentReference *)getDocumentForFirestore:(FIRFirestore *)firestore path:(NSString *)path;
{ return [firestore documentWithPath:path]; }

+ (FIRQuery *)getQueryForFirestore:(FIRFirestore *)firestore
                              path:(NSString *)path
                              type:(NSString *)type {
  if ([type isEqualToString:@"collectionGroup"]) {
    return [firestore collectionGroupWithID:path];
  }

  return [firestore collectionWithPath:path];
}

+ (void)promiseRejectFirestoreException:(RCTPromiseRejectBlock)reject error:(NSError *)error {
  NSArray *codeAndMessage = [self getCodeAndMessage:error];
  [RNFBSharedUtils rejectPromiseWithUserInfo:reject
                                    userInfo:(NSMutableDictionary *)@{
                                      @"code" : (NSString *)codeAndMessage[0],
                                      @"message" : (NSString *)codeAndMessage[1],
                                    }];
}

+ (NSArray *)getCodeAndMessage:(NSError *)error {
  NSString *code = @"unknown";

  if (error == nil) {
    return @[ code, @"An unknown error has occurred." ];
  }

  NSString *message;

  switch (error.code) {
    case FIRFirestoreErrorCodeAborted:
      code = @"aborted";
      message = @"The operation was aborted, typically due to a concurrency issue like transaction "
                @"aborts, etc.";
      break;
    case FIRFirestoreErrorCodeAlreadyExists:
      code = @"already-exists";
      message = @"Some document that we attempted to create already exists.";
      break;
    case FIRFirestoreErrorCodeCancelled:
      code = @"cancelled";
      message = @"The operation was cancelled (typically by the caller).";
      break;
    case FIRFirestoreErrorCodeDataLoss:
      code = @"data-loss";
      message = @"Unrecoverable data loss or corruption.";
      break;
    case FIRFirestoreErrorCodeDeadlineExceeded:
      code = @"deadline-exceeded";
      message = @"Deadline expired before operation could complete. For operations that change the "
                @"state of the system, this error may be returned even if the operation has "
                @"completed successfully. For example, a successful response from a server could "
                @"have been delayed long enough for the deadline to expire.";
      break;
    case FIRFirestoreErrorCodeFailedPrecondition:
      code = @"failed-precondition";
      if ([error.localizedDescription containsString:@"query requires an index"]) {
        message = error.localizedDescription;
      } else {
        message =
            @"Operation was rejected because the system is not in a state required for the "
            @"operation's execution. Ensure your query has been indexed via the Firebase console.";
      }
      break;
    case FIRFirestoreErrorCodeInternal:
      code = @"internal";
      message = @"Internal errors. Means some invariants expected by underlying system has been "
                @"broken. If you see one of these errors, something is very broken.";
      break;
    case FIRFirestoreErrorCodeInvalidArgument:
      code = @"invalid-argument";
      message = @"Client specified an invalid argument. Note that this differs from "
                @"failed-precondition. invalid-argument indicates arguments that are problematic "
                @"regardless of the state of the system (e.g., an invalid field name).";
      break;
    case FIRFirestoreErrorCodeNotFound:
      code = @"not-found";
      message = @"Some requested document was not found.";
      break;
    case FIRFirestoreErrorCodeOutOfRange:
      code = @"out-of-range";
      message = @"Operation was attempted past the valid range.";
      break;
    case FIRFirestoreErrorCodePermissionDenied:
      code = @"permission-denied";
      message = @"The caller does not have permission to execute the specified operation.";
      break;
    case FIRFirestoreErrorCodeResourceExhausted:
      code = @"resource-exhausted";
      message = @"Some resource has been exhausted, perhaps a per-user quota, or perhaps the "
                @"entire file system is out of space.";
      break;
    case FIRFirestoreErrorCodeUnauthenticated:
      code = @"unauthenticated";
      message = @"The request does not have valid authentication credentials for the operation.";
      break;
    case FIRFirestoreErrorCodeUnavailable:
      code = @"unavailable";
      message = @"The service is currently unavailable. This is a most likely a transient "
                @"condition and may be corrected by retrying with a backoff.";
      break;
    case FIRFirestoreErrorCodeUnimplemented:
      code = @"unimplemented";
      message = @"Operation is not implemented or not supported/enabled.";
      break;
    case FIRFirestoreErrorCodeUnknown:
      code = @"unknown";
      message = @"Unknown error or an error from a different error domain.";
      break;
    default:
      code = @"unknown";
      message = @"An unknown error occurred.";
      break;
  }

  return @[ code, message ];
}

@end