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use core::ffi::c_void;
#[cfg(apple)]
use std::os::raw::c_uint;
use std::os::raw::{c_char, c_int};

#[cfg(apple)]
use crate::objc_class;
use crate::{objc_AssociationPolicy, objc_object, OpaqueData, BOOL};

/// An opaque type that represents an instance variable.
#[repr(C)]
pub struct objc_ivar {
    _priv: [u8; 0],
    _p: OpaqueData,
}

/// A nullable pointer to the start of a method implementation.
///
/// Not all APIs are guaranteed to take NULL values; read the docs!
pub type IMP = Option<unsafe extern "C" fn()>;

/// Not available on macOS x86.
///
/// Remember that this is non-null!
#[cfg(all(apple, not(all(target_os = "macos", target_arch = "x86"))))]
pub type objc_hook_getClass =
    unsafe extern "C" fn(name: *const c_char, out_cls: *mut *const objc_class) -> BOOL;

/// Not available on macOS x86.
///
/// Remember that this is non-null!
#[cfg(all(apple, not(all(target_os = "macos", target_arch = "x86"))))]
pub type objc_hook_lazyClassNamer = unsafe extern "C" fn(cls: *const objc_class) -> *const c_char;

extern "C" {
    pub fn imp_getBlock(imp: IMP) -> *mut objc_object;
    pub fn imp_implementationWithBlock(block: *mut objc_object) -> IMP;
    pub fn imp_removeBlock(imp: IMP) -> BOOL;

    pub fn ivar_getName(ivar: *const objc_ivar) -> *const c_char;
    pub fn ivar_getOffset(ivar: *const objc_ivar) -> isize;
    pub fn ivar_getTypeEncoding(ivar: *const objc_ivar) -> *const c_char;

    #[cfg(apple)]
    pub fn objc_copyClassNamesForImage(
        image: *const c_char,
        out_len: *mut c_uint,
    ) -> *mut *const c_char;
    #[cfg(apple)]
    pub fn objc_copyImageNames(out_len: *mut c_uint) -> *mut *const c_char;

    // Instead of being able to change this, it's a weak symbol on GNUStep.
    #[cfg(apple)]
    pub fn objc_enumerationMutation(obj: *mut objc_object);
    #[cfg(apple)]
    pub fn objc_setEnumerationMutationHandler(
        handler: Option<unsafe extern "C" fn(obj: *mut objc_object)>,
    );

    pub fn objc_getAssociatedObject(
        object: *const objc_object,
        key: *const c_void,
    ) -> *const objc_object;
    pub fn objc_setAssociatedObject(
        object: *mut objc_object,
        key: *const c_void,
        value: *mut objc_object,
        policy: objc_AssociationPolicy,
    );
    pub fn objc_removeAssociatedObjects(object: *mut objc_object);

    #[cfg(apple)]
    pub fn objc_setForwardHandler(fwd: *mut c_void, fwd_stret: *mut c_void);
    // These two are defined in:
    // - Apple: objc-sync.h
    // - GNUStep: dtable.h / associate.m
    pub fn objc_sync_enter(obj: *mut objc_object) -> c_int;
    pub fn objc_sync_exit(obj: *mut objc_object) -> c_int;

    /// Not available on macOS x86.
    ///
    /// Remember that this is non-null!
    #[cfg(all(apple, not(all(target_os = "macos", target_arch = "x86"))))]
    pub fn objc_setHook_getClass(
        new_value: objc_hook_getClass,
        out_old_value: *mut objc_hook_getClass,
    );
    /// Not available on macOS x86.
    ///
    /// Remember that this is non-null!
    #[cfg(all(apple, not(all(target_os = "macos", target_arch = "x86"))))]
    pub fn objc_setHook_lazyClassNamer(
        new_value: objc_hook_lazyClassNamer,
        out_old_value: *mut objc_hook_lazyClassNamer,
    );

    // #[deprecated = "not recommended"]
    // #[cfg(apple)]
    // pub fn _objc_flush_caches

    // #[cfg(any(gnustep, winobjc))]
    // objc_test_capability
}