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    use std::sync::Arc;
    use std::path::PathBuf;
    use std::fs::create_dir_all;
    use app_dirs::{app_dir, AppDataType};
    use {storage, APP_INFO};
    use db;
    use config::Config;
    use chain::IndexedBlock;

    pub fn open_db(data_dir: &Option<String>, db_cache: usize) -> storage::SharedStore {
    	let db_path = match *data_dir {
    		Some(ref data_dir) => custom_path(&data_dir, "db"),
    		None => app_dir(AppDataType::UserData, &APP_INFO, "db").expect("Failed to get app dir"),
    	};
    	Arc::new(db::BlockChainDatabase::open_at_path(db_path, db_cache).expect("Failed to open database"))
    }

    pub fn node_table_path(cfg: &Config) -> PathBuf {
    	let mut node_table = match cfg.data_dir {
    		Some(ref data_dir) => custom_path(&data_dir, "p2p"),
    		None => app_dir(AppDataType::UserData, &APP_INFO, "p2p").expect("Failed to get app dir"),
    	};
    	node_table.push("nodes.csv");
    	node_table
    }

    pub fn init_db(cfg: &Config) -> Result<(), String> {
    	// insert genesis block if db is empty
    	let genesis_block: IndexedBlock = cfg.network.genesis_block().into();
    	match cfg.db.block_hash(0) {
    		Some(ref db_genesis_block_hash) if db_genesis_block_hash != genesis_block.hash() => Err("Trying to open database with incompatible genesis block".into()),
    		Some(_) => Ok(()),
    		None => {
    			let hash = genesis_block.hash().clone();
    			cfg.db.insert(genesis_block).expect("Failed to insert genesis block to the database");
    			cfg.db.canonize(&hash).expect("Failed to canonize genesis block");
    			Ok(())
    		}
    	}
    }

    fn custom_path(data_dir: &str, sub_dir: &str) -> PathBuf {
    	let mut path = PathBuf::from(data_dir);
    	path.push(sub_dir);
    	create_dir_all(&path).expect("Failed to get app dir");
    	path
    }

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