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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) 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/>.

// Substrate
use sp_database::{error::DatabaseError, Change, ColumnId, Database, Transaction};

fn handle_err<T>(result: parity_db::Result<T>) -> T {
    match result {
        Ok(r) => r,
        Err(e) => {
            panic!("Critical database error: {:?}", e);
        },
    }
}

pub struct DbAdapter(pub parity_db::Db);

impl<H: Clone + AsRef<[u8]>> Database<H> for DbAdapter {
    fn commit(&self, transaction: Transaction<H>) -> Result<(), DatabaseError> {
        handle_err(
            self.0
                .commit(transaction.0.into_iter().map(|change| match change {
                    Change::Set(col, key, value) => (col as u8, key, Some(value)),
                    Change::Remove(col, key) => (col as u8, key, None),
                    _ => unimplemented!(),
                })),
        );

        Ok(())
    }

    fn get(&self, col: ColumnId, key: &[u8]) -> Option<Vec<u8>> {
        handle_err(self.0.get(col as u8, key))
    }

    fn contains(&self, col: ColumnId, key: &[u8]) -> bool {
        handle_err(self.0.get_size(col as u8, key)).is_some()
    }

    fn value_size(&self, col: ColumnId, key: &[u8]) -> Option<usize> {
        handle_err(self.0.get_size(col as u8, key)).map(|s| s as usize)
    }

    fn supports_ref_counting(&self) -> bool {
        true
    }

    fn sanitize_key(&self, key: &mut Vec<u8>) {
        let _prefix = key.drain(0..key.len() - super::DB_HASH_LEN);
    }
}