use clap::ArgMatches;
use sync::{create_sync_blocks_writer, Error};
use config::Config;
use util::{open_db, init_db};

pub fn import(cfg: Config, matches: &ArgMatches) -> Result<(), String> {
	let db = open_db(&cfg);
	// TODO: this might be unnecessary here!
	try!(init_db(&cfg, &db));

	let blk_path = matches.value_of("PATH").expect("PATH is required in cli.yml; qed");
	let skip_verification = matches.is_present("skip-verification");

	let mut writer = create_sync_blocks_writer(db, cfg.magic, !skip_verification);

	let blk_dir = try!(::import::open_blk_dir(blk_path).map_err(|_| "Import directory does not exist".to_owned()));
	let mut counter = 0;
	for blk in blk_dir {
		// TODO: verify magic!
		let blk = try!(blk.map_err(|_| "Cannot read block".to_owned()));
		match writer.append_block(blk.block) {
			Ok(_) => {
				counter += 1;
				if counter % 1000 == 0 {
					info!(target: "sync", "Imported {} blocks", counter);
				}
			}
			Err(Error::TooManyOrphanBlocks) => return Err("Too many orphan (unordered) blocks".into()),
			Err(_) => return Err("Cannot append block".into()),
		}
	}

	info!("Finished import of {} blocks", counter);

	Ok(())
}