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// Copyright 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 glib::translate::*;
use glib_sys::gpointer;
use gtk_sys;
use libc::c_uint;
use std::boxed::Box as Box_;
use Clipboard;
use SelectionData;
use TargetEntry;

impl Clipboard {
    /// Virtually sets the contents of the specified clipboard by providing
    /// a list of supported formats for the clipboard data and a function
    /// to call to get the actual data when it is requested.
    /// ## `targets`
    /// array containing information
    ///  about the available forms for the clipboard data
    /// ## `n_targets`
    /// number of elements in `targets`
    /// ## `get_func`
    /// function to call to get the actual clipboard data
    /// ## `clear_func`
    /// when the clipboard contents are set again,
    ///  this function will be called, and `get_func` will not be subsequently
    ///  called.
    /// ## `user_data`
    /// user data to pass to `get_func` and `clear_func`.
    ///
    /// # Returns
    ///
    /// `true` if setting the clipboard data succeeded.
    ///  If setting the clipboard data failed the provided callback
    ///  functions will be ignored.
    pub fn set_with_data<F: Fn(&Clipboard, &SelectionData, u32) + 'static>(
        &self,
        targets: &[TargetEntry],
        f: F,
    ) -> bool {
        unsafe extern "C" fn trampoline<F: Fn(&Clipboard, &SelectionData, u32) + 'static>(
            clipboard: *mut gtk_sys::GtkClipboard,
            selection_data: *mut gtk_sys::GtkSelectionData,
            info: c_uint,
            user_data: gpointer,
        ) {
            let f: &F = &*(user_data as *const F);
            f(
                &from_glib_borrow(clipboard),
                &from_glib_borrow(selection_data),
                info,
            );
        }
        unsafe extern "C" fn cleanup<F: Fn(&Clipboard, &SelectionData, u32) + 'static>(
            _clipboard: *mut gtk_sys::GtkClipboard,
            user_data: gpointer,
        ) {
            Box_::<F>::from_raw(user_data as *mut _);
        }
        let stashed_targets: Vec<_> = targets.iter().map(|e| e.to_glib_none()).collect();
        let mut t = Vec::with_capacity(stashed_targets.len());
        for stash in &stashed_targets {
            unsafe {
                t.push(gtk_sys::GtkTargetEntry {
                    target: (*stash.0).target,
                    flags: (*stash.0).flags,
                    info: (*stash.0).info,
                });
            }
        }
        let t_ptr: *mut gtk_sys::GtkTargetEntry = t.as_mut_ptr();
        let f: Box_<F> = Box_::new(f);
        let user_data = Box_::into_raw(f) as *mut _;
        let success: bool = unsafe {
            from_glib(gtk_sys::gtk_clipboard_set_with_data(
                self.to_glib_none().0,
                t_ptr,
                t.len() as c_uint,
                Some(trampoline::<F>),
                Some(cleanup::<F>),
                user_data,
            ))
        };
        if !success {
            // Cleanup function is not called in case of a failure.
            unsafe {
                Box_::<F>::from_raw(user_data as *mut _);
            }
        }
        success
    }
}