/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
 *               2018
 *   Jonathan Schleifer <js@heap.zone>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#import "OFObject.h"

OF_ASSUME_NONNULL_BEGIN

@class OFArray OF_GENERIC(ObjectType);
@class OFMutableArray OF_GENERIC(ObjectType);
@class OFString;

enum {
	OF_PROPERTY_READONLY	=   0x01,
	OF_PROPERTY_ASSIGN	=   0x04,
	OF_PROPERTY_READWRITE	=   0x08,
	OF_PROPERTY_RETAIN	=   0x10,
	OF_PROPERTY_COPY	=   0x20,
	OF_PROPERTY_NONATOMIC	=   0x40,
	OF_PROPERTY_SYNTHESIZED	=  0x100,
	OF_PROPERTY_DYNAMIC	=  0x200,
	OF_PROPERTY_ATOMIC	=  0x400,
	OF_PROPERTY_WEAK	=  0x800
};

/*!
 * @class OFMethod OFIntrospection.h ObjFW/OFIntrospection.h
 *
 * @brief A class for describing a method.
 */
@interface OFMethod: OFObject
{
	SEL _selector;
	OFString *_name;
	const char *_typeEncoding;
}

/*!
 * @brief The selector of the method.
 */
@property (readonly, nonatomic) SEL selector;

/*!
 * @brief The name of the method.
 */
@property (readonly, nonatomic) OFString *name;

/*!
 * @brief The type encoding for the method.
 */
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) const char *typeEncoding;

- (instancetype)init OF_UNAVAILABLE;
@end

/*!
 * @class OFProperty OFIntrospection.h ObjFW/OFIntrospection.h
 *
 * @brief A class for describing a property.
 */
@interface OFProperty: OFObject
{
	OFString *_name;
	unsigned int _attributes;
	OFString *_Nullable _getter, *_Nullable _setter, *_Nullable _iVar;
}

/*!
 * @brief The name of the property.
 */
@property (readonly, nonatomic) OFString *name;

/*!
 * @brief The attributes of the property.
 *
 * The attributes are a bitmask with the following possible flags:@n
 * Flag                          | Description
 * ------------------------------|-------------------------------------
 * OF_PROPERTY_READONLY          | The property is declared `readonly`
 * OF_PROPERTY_READWRITE         | The property is declared `readwrite`
 * OF_PROPERTY_ASSIGN            | The property is declared `assign`
 * OF_PROPERTY_RETAIN            | The property is declared `retain`
 * OF_PROPERTY_COPY              | The property is declared `copy`
 * OF_PROPERTY_NONATOMIC         | The property is declared `nonatomic`
 * OF_PROPERTY_ATOMIC            | The property is declared `atomic`
 * OF_PROPERTY_WEAK              | The property is declared `weak`
 * OF_PROPERTY_SYNTHESIZED       | The property is synthesized
 * OF_PROPERTY_DYNAMIC           | The property is dynamic
 */
@property (readonly, nonatomic) unsigned int attributes;

/*!
 * @brief The name of the getter.
 */
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *getter;

/*!
 * @brief The name of the setter.
 */
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *setter;

/*!
 * @brief The name of the backing iVar.
 */
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *iVar;

- (instancetype)init OF_UNAVAILABLE;
@end

/*!
 * @class OFInstanceVariable OFIntrospection.h ObjFW/OFIntrospection.h
 *
 * @brief A class for describing an instance variable.
 */
@interface OFInstanceVariable: OFObject
{
	OFString *_name;
	const char *_typeEncoding;
	ptrdiff_t _offset;
}

/*!
 * @brief The name of the instance variable.
 */
@property (readonly, nonatomic) OFString *name;

/*!
 * @brief The offset of the instance variable.
 */
@property (readonly, nonatomic) ptrdiff_t offset;

/*!
 * @brief The type encoding for the instance variable.
 */
@property OF_NULLABLE_PROPERTY (readonly, nonatomic) const char *typeEncoding;

- (instancetype)init OF_UNAVAILABLE;
@end

/*!
 * @class OFIntrospection OFIntrospection.h ObjFW/OFIntrospection.h
 *
 * @brief A class for introspecting classes.
 */
@interface OFIntrospection: OFObject
{
	OFMutableArray OF_GENERIC(OFMethod *) *_classMethods;
	OFMutableArray OF_GENERIC(OFMethod *) *_instanceMethods;
	OFMutableArray OF_GENERIC(OFProperty *) *_properties;
	OFMutableArray OF_GENERIC(OFInstanceVariable *) *_instanceVariables;
}

/*!
 * @brief The class methods of the class.
 */
@property (readonly, nonatomic) OFArray OF_GENERIC(OFMethod *) *classMethods;

/*!
 * @brief The instance methods of the class.
 */
@property (readonly, nonatomic) OFArray OF_GENERIC(OFMethod *) *instanceMethods;

/*!
 * @brief The properties of the class.
 *
 * @warning **Do not rely on this, as this behaves differently depending on the
 *	    compiler and ABI used!**
 *
 * @warning For the ObjFW ABI, Clang only emits data for property introspection
 *	    if `@``synthesize` or `@``dynamic` has been used on the property,
 *	    not if the property has only been implemented by methods. Using
 *	    `@``synthesize` and manually implementing the methods works,
 *	    though.
 *
 * @warning For the Apple ABI, Clang and GCC both emit data for property
 *	    introspection for every property that has been declared using
 *	    `@``property`, even if no `@``synchronize` or `@``dynamic` has been
 *	    used.
 *
 * @warning GCC does not emit any data for property introspection for the GNU
 *	    ABI.
 */
@property (readonly, nonatomic) OFArray OF_GENERIC(OFProperty *) *properties;

/*!
 * @brief The instance variables of the class.
 */
@property (readonly, nonatomic)
    OFArray OF_GENERIC(OFInstanceVariable *) *instanceVariables;

/* TODO: protocols */

/*!
 * @brief Creates a new introspection for the specified class.
 *
 * @return A new, autoreleased introspection for the specified class
 */
+ (instancetype)introspectionWithClass: (Class)class_;

- (instancetype)init OF_UNAVAILABLE;

/*!
 * @brief Initializes an already allocated OFIntrospection with the specified
 *	  class.
 *
 * @return An initialized OFIntrospection
 */
- (instancetype)initWithClass: (Class)class_ OF_DESIGNATED_INITIALIZER;
@end

OF_ASSUME_NONNULL_END