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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This file is part of Frontier.
//
// Copyright (c) 2017-2022 Parity Technologies (UK) Ltd.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

use std::{marker::PhantomData, sync::Arc};

use ethereum_types::{H160, H256, U256};
use scale_codec::Decode;
// Substrate
use sc_client_api::backend::{Backend, StorageProvider};
use sp_blockchain::HeaderBackend;
use sp_runtime::{traits::Block as BlockT, Permill};
use sp_storage::StorageKey;
// Frontier
use fp_rpc::TransactionStatus;
use fp_storage::*;

use super::{blake2_128_extend, storage_prefix_build, StorageOverride};

/// An override for runtimes that use Schema V1
pub struct SchemaV1Override<B: BlockT, C, BE> {
    client: Arc<C>,
    _marker: PhantomData<(B, BE)>,
}

impl<B: BlockT, C, BE> SchemaV1Override<B, C, BE> {
    pub fn new(client: Arc<C>) -> Self {
        Self {
            client,
            _marker: PhantomData,
        }
    }
}

impl<B, C, BE> SchemaV1Override<B, C, BE>
where
    B: BlockT,
    C: HeaderBackend<B> + StorageProvider<B, BE> + 'static,
    BE: Backend<B> + 'static,
{
    fn query_storage<T: Decode>(&self, block_hash: B::Hash, key: &StorageKey) -> Option<T> {
        if let Ok(Some(data)) = self.client.storage(block_hash, key) {
            if let Ok(result) = Decode::decode(&mut &data.0[..]) {
                return Some(result)
            }
        }
        None
    }
}

impl<B, C, BE> StorageOverride<B> for SchemaV1Override<B, C, BE>
where
    B: BlockT,
    C: HeaderBackend<B> + StorageProvider<B, BE> + 'static,
    BE: Backend<B> + 'static,
{
    /// For a given account address, returns pallet_evm::AccountCodes.
    fn account_code_at(&self, block_hash: B::Hash, address: H160) -> Option<Vec<u8>> {
        let mut key: Vec<u8> = storage_prefix_build(PALLET_EVM, EVM_ACCOUNT_CODES);
        key.extend(blake2_128_extend(address.as_bytes()));
        self.query_storage::<Vec<u8>>(block_hash, &StorageKey(key))
    }

    /// For a given account address and index, returns pallet_evm::AccountStorages.
    fn storage_at(&self, block_hash: B::Hash, address: H160, index: U256) -> Option<H256> {
        let tmp: &mut [u8; 32] = &mut [0; 32];
        index.to_big_endian(tmp);

        let mut key: Vec<u8> = storage_prefix_build(PALLET_EVM, EVM_ACCOUNT_STORAGES);
        key.extend(blake2_128_extend(address.as_bytes()));
        key.extend(blake2_128_extend(tmp));

        self.query_storage::<H256>(block_hash, &StorageKey(key))
    }

    /// Return the current block.
    fn current_block(&self, block_hash: B::Hash) -> Option<ethereum::BlockV2> {
        self.query_storage::<ethereum::BlockV0>(
            block_hash,
            &StorageKey(storage_prefix_build(
                PALLET_ETHEREUM,
                ETHEREUM_CURRENT_BLOCK,
            )),
        )
        .map(Into::into)
    }

    /// Return the current receipt.
    fn current_receipts(&self, block_hash: B::Hash) -> Option<Vec<ethereum::ReceiptV3>> {
        self.query_storage::<Vec<ethereum::ReceiptV0>>(
            block_hash,
            &StorageKey(storage_prefix_build(
                PALLET_ETHEREUM,
                ETHEREUM_CURRENT_RECEIPTS,
            )),
        )
        .map(|receipts| {
            receipts
                .into_iter()
                .map(|r| {
                    ethereum::ReceiptV3::Legacy(ethereum::EIP658ReceiptData {
                        status_code: r.state_root.to_low_u64_be() as u8,
                        used_gas: r.used_gas,
                        logs_bloom: r.logs_bloom,
                        logs: r.logs,
                    })
                })
                .collect()
        })
    }

    /// Return the current transaction status.
    fn current_transaction_statuses(&self, block_hash: B::Hash) -> Option<Vec<TransactionStatus>> {
        self.query_storage::<Vec<TransactionStatus>>(
            block_hash,
            &StorageKey(storage_prefix_build(
                PALLET_ETHEREUM,
                ETHEREUM_CURRENT_TRANSACTION_STATUS,
            )),
        )
    }

    /// Prior to eip-1559 there is no elasticity.
    fn elasticity(&self, _block_hash: B::Hash) -> Option<Permill> {
        None
    }

    fn is_eip1559(&self, _block_hash: B::Hash) -> bool {
        false
    }
}