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

use crate::prelude::*;
use crate::{TreeIter, TreeModel};
use glib::translate::*;
use glib::IsA;

pub trait TreeModelExtManual: 'static {
    /// Gets the value of one or more cells in the row referenced by `iter`.
    ///
    /// The variable argument list should contain integer column numbers,
    /// each column number followed by a place to store the value being
    /// retrieved. The list is terminated by a -1. For example, to get a
    /// value from column 0 with type `G_TYPE_STRING`, you would
    /// write: `gtk_tree_model_get (model, iter, 0, &place_string_here, -1)`,
    /// where `place_string_here` is a `gchararray`
    /// to be filled with the string.
    ///
    /// Returned values with type `G_TYPE_OBJECT` have to be unreferenced,
    /// values with type `G_TYPE_STRING` or `G_TYPE_BOXED` have to be freed.
    /// Other values are passed by value.
    /// ## `iter`
    /// a row in `self`
    #[doc(alias = "gtk_tree_model_get")]
    #[doc(alias = "gtk_tree_model_get_value")]
    #[doc(alias = "gtk_tree_model_get_valist")]
    fn get(&self, iter: &TreeIter, column: i32) -> glib::Value;
}

impl<O: IsA<TreeModel>> TreeModelExtManual for O {
    fn get(&self, iter: &TreeIter, column: i32) -> glib::Value {
        let total_columns = self.as_ref().n_columns();
        assert!(
            column < total_columns,
            "TreeModel has {} columns but TreeModelExt::get got {} passed as a column number",
            total_columns,
            column
        );
        unsafe {
            let mut value = glib::Value::uninitialized();
            ffi::gtk_tree_model_get_value(
                self.as_ref().to_glib_none().0,
                mut_override(iter.to_glib_none().0),
                column,
                value.to_glib_none_mut().0,
            );
            value
        }
    }
}