/*
 * 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 <Foundation/Foundation.h>

@class FIROptions;

NS_ASSUME_NONNULL_BEGIN

/** A block that takes a BOOL and has no return value. */
typedef void (^FIRAppVoidBoolCallback)(BOOL success)
    NS_SWIFT_UNAVAILABLE("Use Swift's closure syntax instead.");

/**
 * The entry point of Firebase SDKs.
 *
 * Initialize and configure `FirebaseApp` using `FirebaseApp.configure()`
 * or other customized ways as shown below.
 *
 * The logging system has two modes: default mode and debug mode. In default mode, only logs with
 * log level Notice, Warning and Error will be sent to device. In debug mode, all logs will be sent
 * to device. The log levels that Firebase uses are consistent with the ASL log levels.
 *
 * Enable debug mode by passing the `-FIRDebugEnabled` argument to the application. You can add this
 * argument in the application's Xcode scheme. When debug mode is enabled via `-FIRDebugEnabled`,
 * further executions of the application will also be in debug mode. In order to return to default
 * mode, you must explicitly disable the debug mode with the application argument
 * `-FIRDebugDisabled`.
 *
 * It is also possible to change the default logging level in code by calling
 * `FirebaseConfiguration.shared.setLoggerLevel(_:)` with the desired level.
 */
NS_SWIFT_NAME(FirebaseApp)
@interface FIRApp : NSObject

/**
 * Configures a default Firebase app. Raises an exception if any configuration step fails. The
 * default app is named "__FIRAPP_DEFAULT". This method should be called after the app is launched
 * and before using Firebase services. This method should be called from the main thread and
 * contains synchronous file I/O (reading GoogleService-Info.plist from disk).
 */
+ (void)configure;

/**
 * Configures the default Firebase app with the provided options. The default app is named
 * "__FIRAPP_DEFAULT". Raises an exception if any configuration step fails. This method should be
 * called from the main thread.
 *
 * @param options The Firebase application options used to configure the service.
 */
+ (void)configureWithOptions:(FIROptions *)options NS_SWIFT_NAME(configure(options:));

/**
 * Configures a Firebase app with the given name and options. Raises an exception if any
 * configuration step fails. This method should be called from the main thread.
 *
 * @param name The application's name given by the developer. The name should should only contain
               Letters, Numbers and Underscore.
 * @param options The Firebase application options used to configure the services.
 */
// clang-format off
+ (void)configureWithName:(NSString *)name
                  options:(FIROptions *)options NS_SWIFT_NAME(configure(name:options:));
// clang-format on

/**
 * Returns the default app, or `nil` if the default app does not exist.
 */
+ (nullable FIRApp *)defaultApp NS_SWIFT_NAME(app());

/**
 * Returns a previously created `FirebaseApp` instance with the given name, or `nil` if no such app
 * exists. This method is thread safe.
 */
+ (nullable FIRApp *)appNamed:(NSString *)name NS_SWIFT_NAME(app(name:));

/**
 * Returns the set of all extant `FirebaseApp` instances, or `nil` if there are no `FirebaseApp`
 * instances. This method is thread safe.
 */
@property(class, readonly, nullable) NSDictionary<NSString *, FIRApp *> *allApps;

/**
 * Cleans up the current `FirebaseApp`, freeing associated data and returning its name to the pool
 * for future use. This method is thread safe.
 */
- (void)deleteApp:(void (^)(BOOL success))completion;

/**
 * `FirebaseApp` instances should not be initialized directly. Call `FirebaseApp.configure()`,
 * `FirebaseApp.configure(options:)`, or `FirebaseApp.configure(name:options:)` directly.
 */
- (instancetype)init NS_UNAVAILABLE;

/**
 * Gets the name of this app.
 */
@property(nonatomic, copy, readonly) NSString *name;

/**
 * Gets a copy of the options for this app. These are non-modifiable.
 */
@property(nonatomic, copy, readonly) FIROptions *options;

/**
 * Gets or sets whether automatic data collection is enabled for all products. Defaults to `true`
 * unless `FirebaseDataCollectionDefaultEnabled` is set to `NO` in your app's Info.plist. This value
 * is persisted across runs of the app so that it can be set once when users have consented to
 * collection.
 */
@property(nonatomic, readwrite, getter=isDataCollectionDefaultEnabled)
    BOOL dataCollectionDefaultEnabled;

@end

NS_ASSUME_NONNULL_END