/*
 * Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3.0 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * version 3.0 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3.0 along with this program. If not, see
 * <https://www.gnu.org/licenses/>.
 */

#import "OFObject.h"
#import "OFString.h"

#ifdef OF_AMIGAOS
# include <exec/types.h>
#endif

OF_ASSUME_NONNULL_BEGIN

/** @file */

@class OFSortedList OF_GENERIC(ObjectType);
#ifdef OF_HAVE_THREADS
@class OFMutex;
@class OFCondition;
#endif
#ifdef OF_HAVE_SOCKETS
@class OFKernelEventObserver;
#endif
@class OFMutableDictionary OF_GENERIC(KeyType, ObjectType);
@class OFTimer;
@class OFDate;

/**
 * @brief A mode for an OFRunLoop.
 */
typedef OFConstantString *OFRunLoopMode;

#ifdef __cplusplus
extern "C" {
#endif
/**
 * @brief The default mode for an OFRunLoop.
 */
extern const OFRunLoopMode OFDefaultRunLoopMode;
#ifdef __cplusplus
}
#endif

/**
 * @class OFRunLoop OFRunLoop.h ObjFW/OFRunLoop.h
 *
 * @brief A class providing a run loop for the application and its processes.
 */
OF_SUBCLASSING_RESTRICTED
@interface OFRunLoop: OFObject
{
	OFMutableDictionary *_states;
#ifdef OF_HAVE_THREADS
	OFMutex *_statesMutex;
#endif
	OFRunLoopMode _Nullable _currentMode;
	volatile bool _stop;
}

#ifdef OF_HAVE_CLASS_PROPERTIES
@property (class, readonly, nullable, nonatomic) OFRunLoop *mainRunLoop;
@property (class, readonly, nullable, nonatomic) OFRunLoop *currentRunLoop;
#endif
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFRunLoopMode currentMode;

/**
 * @brief Returns the run loop for the main thread.
 *
 * @return The run loop for the main thread
 */
+ (nullable OFRunLoop *)mainRunLoop;

/**
 * @brief Returns the run loop for the current thread.
 *
 * @return The run loop for the current thread
 */
+ (nullable OFRunLoop *)currentRunLoop;

/**
 * @brief Adds an OFTimer to the run loop.
 *
 * @param timer The timer to add
 */
- (void)addTimer: (OFTimer *)timer;

/**
 * @brief Adds an OFTimer to the run loop for the specified mode.
 *
 * @param timer The timer to add
 * @param mode The run loop mode in which to run the timer
 */
- (void)addTimer: (OFTimer *)timer forMode: (OFRunLoopMode)mode;

#if defined(OF_AMIGAOS) || defined(DOXYGEN)
/**
 * @brief Adds an Exec Signal to the run loop.
 *
 * If a signal is added multiple times, the specified methods will be performed
 * in the order added.
 *
 * @note This is only available on AmigaOS!
 *
 * @param signal The signal to add
 * @param target The target to call when the signal was received
 * @param selector The selector to call on the target when the signal was
 *		   received. The selector must have one parameter for the ULONG
 *		   of the signal that was received.
 */
- (void)addExecSignal: (ULONG)signal target: (id)target selector: (SEL)selector;

/**
 * @brief Adds an Exec Signal to the run loop for the specified mode.
 *
 * If a signal is added multiple times, the specified methods will be performed
 * in the order added.
 *
 * @note This is only available on AmigaOS!
 *
 * @param signal The signal to add
 * @param mode The run loop mode in which to handle the signal
 * @param target The target to call when the signal was received
 * @param selector The selector to call on the target when the signal was
 *		   received. The selector must have one parameter for the ULONG
 *		   of the signal that was received.
 */
- (void)addExecSignal: (ULONG)signal
	      forMode: (OFRunLoopMode)mode
	       target: (id)target
	     selector: (SEL)selector;

/**
 * @brief Removes the specified Exec Signal with the specified target and
 *	  selector.
 *
 * @param signal The signal to remove
 * @param target The target which was specified when adding the signal
 * @param selector The selector which was specified when adding the signal
 */
- (void)removeExecSignal: (ULONG)signal
		  target: (id)target
		selector: (SEL)selector;

/**
 * @brief Removes the specified Exec Signal from the specified mode with the
 *	  specified target and selector.
 *
 * @param signal The signal to remove
 * @param mode The run loop mode to which the signal was added
 * @param target The target which was specified when adding the signal
 * @param selector The selector which was specified when adding the signal
 */
- (void)removeExecSignal: (ULONG)signal
		 forMode: (OFRunLoopMode)mode
		  target: (id)target
		selector: (SEL)selector;
#endif

/**
 * @brief Starts the run loop.
 */
- (void)run;

/**
 * @brief Run the run loop until the specified deadline.
 *
 * @param deadline The date until which the run loop should run
 */
- (void)runUntilDate: (nullable OFDate *)deadline;

/**
 * @brief Run the run loop until an event or timer occurs or the specified
 *	  deadline is reached.
 *
 * @param mode The mode in which to run the run loop
 * @param deadline The date until which the run loop should run at the longest
 */
- (void)runMode: (OFRunLoopMode)mode beforeDate: (nullable OFDate *)deadline;

/**
 * @brief Stops the run loop. If there is still an operation being executed, it
 *	  is finished before the run loop stops.
 */
- (void)stop;
@end

OF_ASSUME_NONNULL_END
