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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 glib::object::{Cast, IsA};
use glib::translate::*;
use glib::{ToValue, Type, Value};
use gtk_sys;
use libc::c_int;
use std::ptr;
use ListStore;
use TreeIter;
use TreeModel;

impl ListStore {
    /// Creates a new list store as with `n_columns` columns each of the types passed
    /// in. Note that only types derived from standard GObject fundamental types
    /// are supported.
    ///
    /// As an example, `gtk_list_store_new (3, G_TYPE_INT, G_TYPE_STRING,
    /// GDK_TYPE_PIXBUF);` will create a new `ListStore` with three columns, of type
    /// int, string and `gdk_pixbuf::Pixbuf` respectively.
    /// ## `n_columns`
    /// number of columns in the list store
    ///
    /// # Returns
    ///
    /// a new `ListStore`
    pub fn new(column_types: &[Type]) -> ListStore {
        assert_initialized_main_thread!();
        unsafe {
            let mut column_types = column_types.iter().map(|t| t.to_glib()).collect::<Vec<_>>();
            from_glib_full(gtk_sys::gtk_list_store_newv(
                column_types.len() as c_int,
                column_types.as_mut_ptr(),
            ))
        }
    }
}

pub trait GtkListStoreExtManual: 'static {
    fn insert_with_values(
        &self,
        position: Option<u32>,
        columns: &[u32],
        values: &[&dyn ToValue],
    ) -> TreeIter;

    /// Reorders `self` to follow the order indicated by `new_order`. Note that
    /// this function only works with unsorted stores.
    /// ## `new_order`
    /// an array of integers mapping the new
    ///  position of each child to its old position before the re-ordering,
    ///  i.e. `new_order``[newpos] = oldpos`. It must have
    ///  exactly as many items as the list store’s length.
    fn reorder(&self, new_order: &[u32]);

    fn set(&self, iter: &TreeIter, columns: &[u32], values: &[&dyn ToValue]);

    /// Sets the data in the cell specified by `iter` and `column`.
    /// The type of `value` must be convertible to the type of the
    /// column.
    /// ## `iter`
    /// A valid `TreeIter` for the row being modified
    /// ## `column`
    /// column number to modify
    /// ## `value`
    /// new value for the cell
    fn set_value(&self, iter: &TreeIter, column: u32, value: &Value);
}

impl<O: IsA<ListStore>> GtkListStoreExtManual for O {
    fn insert_with_values(
        &self,
        position: Option<u32>,
        columns: &[u32],
        values: &[&dyn ToValue],
    ) -> TreeIter {
        unsafe {
            assert!(position.unwrap_or(0) <= i32::max_value() as u32);
            assert_eq!(columns.len(), values.len());
            let n_columns = gtk_sys::gtk_tree_model_get_n_columns(
                self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
            ) as u32;
            assert!(columns.len() <= n_columns as usize);
            for (&column, value) in columns.iter().zip(values.iter()) {
                assert!(column < n_columns);
                let type_ = from_glib(gtk_sys::gtk_tree_model_get_column_type(
                    self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
                    column as c_int,
                ));
                assert!(Value::type_transformable(value.to_value_type(), type_));
            }
            let mut iter = TreeIter::uninitialized();
            gtk_sys::gtk_list_store_insert_with_valuesv(
                self.as_ref().to_glib_none().0,
                iter.to_glib_none_mut().0,
                position.map_or(-1, |n| n as c_int),
                mut_override(columns.as_ptr() as *const c_int),
                values.to_glib_none().0,
                columns.len() as c_int,
            );
            iter
        }
    }

    fn reorder(&self, new_order: &[u32]) {
        unsafe {
            let count = gtk_sys::gtk_tree_model_iter_n_children(
                self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
                ptr::null_mut(),
            );
            let safe_count = count as usize == new_order.len();
            debug_assert!(
                safe_count,
                "Incorrect `new_order` slice length. Expected `{}`, found `{}`.",
                count,
                new_order.len()
            );
            let safe_values = new_order.iter().max().map_or(true, |&max| {
                let max = max as i32;
                max >= 0 && max < count
            });
            debug_assert!(
                safe_values,
                "Some `new_order` slice values are out of range. Maximum safe value: \
                 `{}`. The slice contents: `{:?}`",
                count - 1,
                new_order
            );
            if safe_count && safe_values {
                gtk_sys::gtk_list_store_reorder(
                    self.as_ref().to_glib_none().0,
                    mut_override(new_order.as_ptr() as *const c_int),
                );
            }
        }
    }

    fn set(&self, iter: &TreeIter, columns: &[u32], values: &[&dyn ToValue]) {
        unsafe {
            assert_eq!(columns.len(), values.len());
            let n_columns = gtk_sys::gtk_tree_model_get_n_columns(
                self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
            ) as u32;
            assert!(columns.len() <= n_columns as usize);
            for (&column, value) in columns.iter().zip(values.iter()) {
                assert!(column < n_columns);
                let type_ = from_glib(gtk_sys::gtk_tree_model_get_column_type(
                    self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
                    column as c_int,
                ));
                assert!(Value::type_transformable(value.to_value_type(), type_));
            }
            gtk_sys::gtk_list_store_set_valuesv(
                self.as_ref().to_glib_none().0,
                mut_override(iter.to_glib_none().0),
                mut_override(columns.as_ptr() as *const c_int),
                values.to_glib_none().0,
                columns.len() as c_int,
            );
        }
    }

    fn set_value(&self, iter: &TreeIter, column: u32, value: &Value) {
        unsafe {
            let columns = gtk_sys::gtk_tree_model_get_n_columns(
                self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
            );
            assert!(column < columns as u32);
            let type_ = from_glib(gtk_sys::gtk_tree_model_get_column_type(
                self.as_ref().upcast_ref::<TreeModel>().to_glib_none().0,
                column as c_int,
            ));
            assert!(Value::type_transformable(value.type_(), type_));
            gtk_sys::gtk_list_store_set_value(
                self.as_ref().to_glib_none().0,
                mut_override(iter.to_glib_none().0),
                column as c_int,
                mut_override(value.to_glib_none().0),
            );
        }
    }
}