// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.

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

use std::path::PathBuf;
use ethstore::{EthStore, SecretStore, import_account, import_accounts, read_geth_accounts};
use ethstore::accounts_dir::RootDiskDirectory;
use ethstore::SecretVaultRef;
use ethcore::account_provider::{AccountProvider, AccountProviderSettings};
use helpers::{password_prompt, password_from_file};
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: u32,
	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,
}

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<u32>) -> 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))
	}
}