// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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.

// Parity Ethereum 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 Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

extern crate ethcore_blockchain;
extern crate kvdb_rocksdb;
extern crate migration_rocksdb;

use self::{
    ethcore_blockchain::{BlockChainDB, BlockChainDBHandler},
    kvdb_rocksdb::{Database, DatabaseConfig},
};
use blooms_db;
use ethcore::client::{ClientConfig, DatabaseCompactionProfile};
use ethcore_db::NUM_COLUMNS;
use kvdb::KeyValueDB;
use std::{fs, io, path::Path, sync::Arc};

use cache::CacheConfig;

mod blooms;
mod helpers;
mod migration;

pub use self::migration::migrate;

struct AppDB {
    key_value: Arc<KeyValueDB>,
    blooms: blooms_db::Database,
    trace_blooms: blooms_db::Database,
}

impl BlockChainDB for AppDB {
    fn key_value(&self) -> &Arc<KeyValueDB> {
        &self.key_value
    }

    fn blooms(&self) -> &blooms_db::Database {
        &self.blooms
    }

    fn trace_blooms(&self) -> &blooms_db::Database {
        &self.trace_blooms
    }
}

/// Open a secret store DB using the given secret store data path. The DB path is one level beneath the data path.
#[cfg(feature = "secretstore")]
pub fn open_secretstore_db(data_path: &str) -> Result<Arc<KeyValueDB>, String> {
    use std::path::PathBuf;

    let mut db_path = PathBuf::from(data_path);
    db_path.push("db");
    let db_path = db_path
        .to_str()
        .ok_or_else(|| "Invalid secretstore path".to_string())?;
    Ok(Arc::new(
        Database::open_default(&db_path).map_err(|e| format!("Error opening database: {:?}", e))?,
    ))
}

/// Create a restoration db handler using the config generated by `client_path` and `client_config`.
pub fn restoration_db_handler(
    client_path: &Path,
    client_config: &ClientConfig,
) -> Box<BlockChainDBHandler> {
    let client_db_config = helpers::client_db_config(client_path, client_config);

    struct RestorationDBHandler {
        config: DatabaseConfig,
    }

    impl BlockChainDBHandler for RestorationDBHandler {
        fn open(&self, db_path: &Path) -> io::Result<Arc<BlockChainDB>> {
            open_database(&db_path.to_string_lossy(), &self.config)
        }
    }

    Box::new(RestorationDBHandler {
        config: client_db_config,
    })
}

/// Open a new main DB.
pub fn open_db(
    client_path: &str,
    cache_config: &CacheConfig,
    compaction: &DatabaseCompactionProfile,
) -> io::Result<Arc<BlockChainDB>> {
    let path = Path::new(client_path);

    let db_config = DatabaseConfig {
        memory_budget: Some(cache_config.blockchain() as usize * 1024 * 1024),
        compaction: helpers::compaction_profile(&compaction, path),
        ..DatabaseConfig::with_columns(NUM_COLUMNS)
    };

    open_database(client_path, &db_config)
}

pub fn open_database(client_path: &str, config: &DatabaseConfig) -> io::Result<Arc<BlockChainDB>> {
    let path = Path::new(client_path);

    let blooms_path = path.join("blooms");
    let trace_blooms_path = path.join("trace_blooms");
    fs::create_dir_all(&blooms_path)?;
    fs::create_dir_all(&trace_blooms_path)?;

    let db = AppDB {
        key_value: Arc::new(Database::open(&config, client_path)?),
        blooms: blooms_db::Database::open(blooms_path)?,
        trace_blooms: blooms_db::Database::open(trace_blooms_path)?,
    };

    Ok(Arc::new(db))
}