// 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/>.

use std::num::NonZeroU32;
use params::SpecType;

#[derive(Debug, PartialEq)]
pub enum AccountCmd {
	New(NewAccount),
	List(ListAccounts),
	Import(ImportAccounts),
	ImportFromGeth(ImportFromGethAccounts)
}

#[derive(Debug, PartialEq)]
pub struct ListAccounts {
	pub path: String,
	pub spec: SpecType,
}

#[derive(Debug, PartialEq)]
pub struct NewAccount {
	pub iterations: NonZeroU32,
	pub path: String,
	pub spec: SpecType,
	pub password_file: Option<String>,
}

#[derive(Debug, PartialEq)]
pub struct ImportAccounts {
	pub from: Vec<String>,
	pub to: String,
	pub spec: SpecType,
}

/// Parameters for geth accounts' import
#[derive(Debug, PartialEq)]
pub struct ImportFromGethAccounts {
	/// import mainnet (false) or testnet (true) accounts
	pub testnet: bool,
	/// directory to import accounts to
	pub to: String,
	pub spec: SpecType,
}


#[cfg(not(feature = "accounts"))]
pub fn execute(cmd: AccountCmd) -> Result<String, String> {
		Err("Account management is deprecated. Please see #9997 for alternatives:\nhttps://github.com/paritytech/parity-ethereum/issues/9997".into())
}

#[cfg(feature = "accounts")]
mod command {
	use super::*;
	use std::path::PathBuf;
	use accounts::{AccountProvider, AccountProviderSettings};
	use ethstore::{EthStore, SecretStore, SecretVaultRef, import_account, import_accounts, read_geth_accounts};
	use ethstore::accounts_dir::RootDiskDirectory;
	use helpers::{password_prompt, password_from_file};

	pub fn execute(cmd: AccountCmd) -> Result<String, String> {
		match cmd {
			AccountCmd::New(new_cmd) => new(new_cmd),
			AccountCmd::List(list_cmd) => list(list_cmd),
			AccountCmd::Import(import_cmd) => import(import_cmd),
			AccountCmd::ImportFromGeth(import_geth_cmd) => import_geth(import_geth_cmd)
		}
	}

	fn keys_dir(path: String, spec: SpecType) -> Result<RootDiskDirectory, String> {
		let spec = spec.spec(&::std::env::temp_dir())?;
		let mut path = PathBuf::from(&path);
		path.push(spec.data_dir);
		RootDiskDirectory::create(path).map_err(|e| format!("Could not open keys directory: {}", e))
	}

	fn secret_store(dir: Box<RootDiskDirectory>, iterations: Option<NonZeroU32>) -> Result<EthStore, String> {
		match iterations {
			Some(i) => EthStore::open_with_iterations(dir, i),
			_ => EthStore::open(dir)
		}.map_err(|e| format!("Could not open keys store: {}", e))
	}

	fn new(n: NewAccount) -> Result<String, String> {
		let password = match n.password_file {
			Some(file) => password_from_file(file)?,
			None => password_prompt()?,
		};

		let dir = Box::new(keys_dir(n.path, n.spec)?);
		let secret_store = Box::new(secret_store(dir, Some(n.iterations))?);
		let acc_provider = AccountProvider::new(secret_store, AccountProviderSettings::default());
		let new_account = acc_provider.new_account(&password).map_err(|e| format!("Could not create new account: {}", e))?;
		Ok(format!("0x{:x}", new_account))
	}

	fn list(list_cmd: ListAccounts) -> Result<String, String> {
		let dir = Box::new(keys_dir(list_cmd.path, list_cmd.spec)?);
		let secret_store = Box::new(secret_store(dir, None)?);
		let acc_provider = AccountProvider::new(secret_store, AccountProviderSettings::default());
		let accounts = acc_provider.accounts().map_err(|e| format!("{}", e))?;
		let result = accounts.into_iter()
			.map(|a| format!("0x{:x}", a))
			.collect::<Vec<String>>()
			.join("\n");

		Ok(result)
	}

	fn import(i: ImportAccounts) -> Result<String, String> {
		let to = keys_dir(i.to, i.spec)?;
		let mut imported = 0;

		for path in &i.from {
			let path = PathBuf::from(path);
			if path.is_dir() {
				let from = RootDiskDirectory::at(&path);
				imported += import_accounts(&from, &to).map_err(|e| format!("Importing accounts from {:?} failed: {}", path, e))?.len();
			} else if path.is_file() {
				import_account(&path, &to).map_err(|e| format!("Importing account from {:?} failed: {}", path, e))?;
				imported += 1;
			}
		}

		Ok(format!("{} account(s) imported", imported))
	}

	fn import_geth(i: ImportFromGethAccounts) -> Result<String, String> {
		use std::io::ErrorKind;
		use ethstore::Error;

		let dir = Box::new(keys_dir(i.to, i.spec)?);
		let secret_store = Box::new(secret_store(dir, None)?);
		let geth_accounts = read_geth_accounts(i.testnet);
		match secret_store.import_geth_accounts(SecretVaultRef::Root, geth_accounts, i.testnet) {
			Ok(v) => Ok(format!("Successfully imported {} account(s) from geth.", v.len())),
			Err(Error::Io(ref io_err)) if io_err.kind() == ErrorKind::NotFound => Err("Failed to find geth keys folder.".into()),
			Err(err) => Err(format!("Import geth accounts failed. {}", err))
		}
	}
}

#[cfg(feature = "accounts")]
pub use self::command::execute;