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// Copyright 2013-2018, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use ffi;
use glib_ffi;
use glib::IsA;
use glib::object::Downcast;
use glib::translate::*;

use libc::c_char;
use std::boxed::Box as Box_;
use std::mem::transmute;
use std::cell::RefCell;

use EntryCompletion;
use TreeIter;

pub trait EntryCompletionExtManual {
    fn set_match_func<F: FnMut(&Self, &str, &TreeIter) -> bool>(&self, f: F);
}

impl<O: IsA<EntryCompletion>> EntryCompletionExtManual for O {
    fn set_match_func<F: FnMut(&Self, &str, &TreeIter) -> bool>(&self, f: F) {
        unsafe {
            let f: Box_<RefCell<Box_<FnMut(&Self, &str, &TreeIter) -> bool>>> =
                Box_::new(RefCell::new(Box_::new(f)));
            let callback = transmute(set_match_func_trampoline::<Self> as usize);
            let destroy_callback = transmute(set_match_func_destroy::<Self> as usize);
            ffi::gtk_entry_completion_set_match_func(self.to_glib_none().0,
                                                     callback,
                                                     Box_::into_raw(f) as *mut _,
                                                     destroy_callback);
        }
    }
}

unsafe extern "C" fn set_match_func_trampoline<P>(this: *mut ffi::GtkEntryCompletion,
                                                  key: *const c_char,
                                                  iter: *mut ffi::GtkTreeIter,
                                                  f: glib_ffi::gpointer)
                                                  -> glib_ffi::gboolean
where P: IsA<EntryCompletion> {
    let func: &RefCell<Box<FnMut(&P, &str, &TreeIter) -> bool>> = transmute(f);

    (&mut *func.borrow_mut())(
        &EntryCompletion::from_glib_borrow(this).downcast_unchecked(),
        &String::from_glib_none(key),
        &TreeIter::from_glib_borrow(iter)
    ).to_glib()
}

unsafe extern "C" fn set_match_func_destroy<P>(f: glib_ffi::gpointer)
where P: IsA<EntryCompletion> {
    Box::<RefCell<Box<FnMut(&P, &str, &TreeIter) -> bool>>>::from_raw(
        f as *mut _
    );
}