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// Copyright 2018-2020 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::traits::{
    KeyPtr,
    PackedLayout,
    SpreadLayout,
};
use array_init::array_init;
use ink_primitives::Key;

#[rustfmt::skip]
macro_rules! forward_supported_array_lens {
    ( $mac:ident ) => {
        $mac! {
                 1,  2,  3,  4,  5,  6,  7,  8,  9,
            10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
            20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
            30, 31, 32,
        }
    };
}

macro_rules! impl_layout_for_array {
    ( $($len:literal),* $(,)? ) => {
        $(
            impl<T> SpreadLayout for [T; $len]
            where
                T: SpreadLayout,
            {
                const FOOTPRINT: u64 = $len * <T as SpreadLayout>::FOOTPRINT;
                const REQUIRES_DEEP_CLEAN_UP: bool = <T as SpreadLayout>::REQUIRES_DEEP_CLEAN_UP;

                fn push_spread(&self, ptr: &mut KeyPtr) {
                    for elem in self {
                        <T as SpreadLayout>::push_spread(elem, ptr)
                    }
                }

                fn clear_spread(&self, ptr: &mut KeyPtr) {
                    for elem in self {
                        <T as SpreadLayout>::clear_spread(elem, ptr)
                    }
                }

                fn pull_spread(ptr: &mut KeyPtr) -> Self {
                    array_init::<Self, _>(|_| <T as SpreadLayout>::pull_spread(ptr))
                }
            }

            impl<T> PackedLayout for [T; $len]
            where
                T: PackedLayout,
            {
                #[inline]
                fn push_packed(&self, at: &Key) {
                    for elem in self {
                        <T as PackedLayout>::push_packed(elem, at)
                    }
                }

                #[inline]
                fn clear_packed(&self, at: &Key) {
                    for elem in self {
                        <T as PackedLayout>::clear_packed(elem, at)
                    }
                }

                #[inline]
                fn pull_packed(&mut self, at: &Key) {
                    for elem in self {
                        <T as PackedLayout>::pull_packed(elem, at)
                    }
                }
            }
        )*
    }
}
forward_supported_array_lens!(impl_layout_for_array);