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// Copyright 2013-2016, 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 libc::{c_char, c_int};
use std::boxed::Box as Box_;
use std::mem::transmute;
use std::{slice, str};
use ffi;
use glib::object::{IsA, Cast};
use glib::translate::*;
use glib::signal::{SignalHandlerId, connect_raw};
use glib_ffi;
use TextBuffer;
use TextIter;

pub trait TextBufferExtManual: 'static {
    fn connect_insert_text<F: Fn(&Self, &mut TextIter, &str) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<TextBuffer>> TextBufferExtManual for O {
    fn connect_insert_text<F: Fn(&Self, &mut TextIter, &str) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(self.to_glib_none().0 as *mut _, b"insert-text\0".as_ptr() as *mut _,
                Some(transmute(insert_text_trampoline::<Self, F> as usize)), Box_::into_raw(f))
        }
    }
}

unsafe extern "C" fn insert_text_trampoline<T, F: Fn(&T, &mut TextIter, &str) + 'static>(this: *mut ffi::GtkTextBuffer,
                                                                                         location: *mut ffi::GtkTextIter,
                                                                                         text: *mut c_char,
                                                                                         len: c_int,
                                                                                         f: glib_ffi::gpointer)
where T: IsA<TextBuffer> {
    let f: &F = transmute(f);
    f(&TextBuffer::from_glib_borrow(this).unsafe_cast(),
      &mut from_glib_borrow(location),
      str::from_utf8(slice::from_raw_parts(text as *const u8, len as usize)).unwrap())
}