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// Copyright 2018-2022 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 super::SmallVec;
use crate::traits::{
    KeyPtr,
    PackedLayout,
    SpreadAllocate,
    SpreadLayout,
};

#[cfg(feature = "std")]
const _: () = {
    use crate::{
        lazy::LazyArray,
        traits::StorageLayout,
    };
    use ink_metadata::layout::{
        FieldLayout,
        Layout,
        StructLayout,
    };
    use scale_info::TypeInfo;

    impl<T, const N: usize> StorageLayout for SmallVec<T, N>
    where
        T: PackedLayout + TypeInfo + 'static,
    {
        fn layout(key_ptr: &mut KeyPtr) -> Layout {
            Layout::Struct(StructLayout::new([
                FieldLayout::new("len", <u32 as StorageLayout>::layout(key_ptr)),
                FieldLayout::new(
                    "elems",
                    <LazyArray<T, N> as StorageLayout>::layout(key_ptr),
                ),
            ]))
        }
    }
};

impl<T, const N: usize> SpreadLayout for SmallVec<T, N>
where
    T: PackedLayout,
{
    const FOOTPRINT: u64 = 1 + N as u64;

    fn pull_spread(ptr: &mut KeyPtr) -> Self {
        Self {
            len: SpreadLayout::pull_spread(ptr),
            elems: SpreadLayout::pull_spread(ptr),
        }
    }

    fn push_spread(&self, ptr: &mut KeyPtr) {
        SpreadLayout::push_spread(&self.len, ptr);
        SpreadLayout::push_spread(&self.elems, ptr);
    }

    fn clear_spread(&self, ptr: &mut KeyPtr) {
        self.clear_cells();
        SpreadLayout::clear_spread(&self.len, ptr);
        SpreadLayout::clear_spread(&self.elems, ptr);
    }
}

impl<T, const N: usize> SpreadAllocate for SmallVec<T, N>
where
    T: PackedLayout,
{
    fn allocate_spread(ptr: &mut KeyPtr) -> Self {
        Self {
            len: SpreadAllocate::allocate_spread(ptr),
            elems: SpreadAllocate::allocate_spread(ptr),
        }
    }
}