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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::AttrIterator;
use crate::Attribute;
use crate::FontDescription;
use crate::Language;
use glib::translate::*;

use std::ptr;

impl AttrIterator {
    /// Get the font and other attributes at the current
    /// iterator position.
    /// ## `desc`
    /// a [`FontDescription`][crate::FontDescription] to fill in with the current
    ///   values. The family name in this structure will be set using
    ///   `Pango::FontDescription::set_family_static()` using
    ///   values from an attribute in the [`AttrList`][crate::AttrList] associated
    ///   with the iterator, so if you plan to keep it around, you
    ///   must call:
    ///   `pango_font_description_set_family (desc, pango_font_description_get_family (desc))`.
    ///
    /// # Returns
    ///
    ///
    /// ## `language`
    /// location to store language tag
    ///   for item, or [`None`] if none is found.
    ///
    /// ## `extra_attrs`
    ///
    ///   location in which to store a list of non-font attributes
    ///   at the the current position; only the highest priority
    ///   value of each attribute will be added to this list. In
    ///   order to free this value, you must call
    ///   `Pango::Attribute::destroy()` on each member.
    #[doc(alias = "pango_attr_iterator_get_font")]
    #[doc(alias = "get_font")]
    pub fn font(
        &mut self,
        desc: &mut FontDescription,
        language: Option<&Language>,
        extra_attrs: &[&Attribute],
    ) {
        unsafe {
            let stash_vec: Vec<_> = extra_attrs.iter().rev().map(|v| v.to_glib_none()).collect();
            let mut list: *mut glib::ffi::GSList = ptr::null_mut();
            for stash in &stash_vec {
                list = glib::ffi::g_slist_prepend(list, Ptr::to(stash.0));
            }

            ffi::pango_attr_iterator_get_font(
                self.to_glib_none_mut().0,
                desc.to_glib_none_mut().0,
                &mut language.to_glib_none().0,
                &mut list,
            );
        }
    }
}