// This file is part of Substrate.

// Copyright (C) 2020 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Implementation of the `insert` subcommand

use crate::{
	Error, KeystoreParams, CryptoSchemeFlag, SharedParams, utils, with_crypto_scheme,
	SubstrateCli,
};
use std::{sync::Arc, convert::TryFrom};
use structopt::StructOpt;
use sp_core::{crypto::KeyTypeId, crypto::SecretString};
use sp_keystore::{SyncCryptoStorePtr, SyncCryptoStore};
use sc_keystore::LocalKeystore;
use sc_service::config::{KeystoreConfig, BasePath};

/// The `insert` command
#[derive(Debug, StructOpt)]
#[structopt(
	name = "insert",
	about = "Insert a key to the keystore of a node."
)]
pub struct InsertKeyCmd {
	/// The secret key URI.
	/// If the value is a file, the file content is used as URI.
	/// If not given, you will be prompted for the URI.
	#[structopt(long)]
	suri: Option<String>,

	/// Key type, examples: "gran", or "imon"
	#[structopt(long)]
	key_type: String,

	#[allow(missing_docs)]
	#[structopt(flatten)]
	pub shared_params: SharedParams,

	#[allow(missing_docs)]
	#[structopt(flatten)]
	pub keystore_params: KeystoreParams,

	#[allow(missing_docs)]
	#[structopt(flatten)]
	pub crypto_scheme: CryptoSchemeFlag,
}

impl InsertKeyCmd {
	/// Run the command
	pub fn run<C: SubstrateCli>(&self, cli: &C) -> Result<(), Error> {
		let suri = utils::read_uri(self.suri.as_ref())?;
		let base_path = self.shared_params
			.base_path()
			.unwrap_or_else(|| BasePath::from_project("", "", &C::executable_name()));
		let chain_id = self.shared_params.chain_id(self.shared_params.is_dev());
		let chain_spec = cli.load_spec(&chain_id)?;
		let config_dir = base_path.config_dir(chain_spec.id());

		let (keystore, public) = match self.keystore_params.keystore_config(&config_dir)? {
			(_, KeystoreConfig::Path { path, password }) => {
				let public = with_crypto_scheme!(
					self.crypto_scheme.scheme,
					to_vec(&suri, password.clone())
				)?;
				let keystore: SyncCryptoStorePtr = Arc::new(LocalKeystore::open(path, password)?);
				(keystore, public)
			},
			_ => unreachable!("keystore_config always returns path and password; qed")
		};

		let key_type = KeyTypeId::try_from(self.key_type.as_str()).map_err(|_| Error::KeyTypeInvalid)?;

		SyncCryptoStore::insert_unknown(&*keystore, key_type, &suri, &public[..])
			.map_err(|_| Error::KeyStoreOperation)?;

		Ok(())
	}
}

fn to_vec<P: sp_core::Pair>(uri: &str, pass: Option<SecretString>) -> Result<Vec<u8>, Error> {
	let p = utils::pair_from_suri::<P>(uri, pass)?;
	Ok(p.public().as_ref().to_vec())
}

#[cfg(test)]
mod tests {
	use super::*;
	use structopt::StructOpt;
	use tempfile::TempDir;
	use sp_core::{sr25519::Pair, Pair as _, Public};
	use sc_service::{ChainSpec, GenericChainSpec, ChainType, NoExtension};

	struct Cli;

	impl SubstrateCli for Cli {
		fn impl_name() -> String {
			"test".into()
		}

		fn impl_version() -> String {
			"2.0".into()
		}

		fn description() -> String {
			"test".into()
		}

		fn support_url() -> String {
			"test.test".into()
		}

		fn copyright_start_year() -> i32 {
			2020
		}

		fn author() -> String {
			"test".into()
		}

		fn native_runtime_version(_: &Box<dyn ChainSpec>) -> &'static sp_version::RuntimeVersion {
			unimplemented!("Not required in tests")
		}

		fn load_spec(&self, _: &str) -> std::result::Result<Box<dyn ChainSpec>, String> {
			Ok(
				Box::new(
					GenericChainSpec::from_genesis(
						"test",
						"test_id",
						ChainType::Development,
						|| unimplemented!("Not required in tests"),
						Vec::new(),
						None,
						None,
						None,
						NoExtension::None,
					),
				),
			)
		}
	}

	#[test]
	fn insert_with_custom_base_path() {
		let path = TempDir::new().unwrap();
		let path_str = format!("{}", path.path().display());
		let (key, uri, _) = Pair::generate_with_phrase(None);

		let inspect = InsertKeyCmd::from_iter(
			&["insert-key", "-d", &path_str, "--key-type", "test", "--suri", &uri],
		);
		assert!(inspect.run(&Cli).is_ok());

		let keystore = LocalKeystore::open(
			path.path().join("chains").join("test_id").join("keystore"),
			None,
		).unwrap();
		assert!(keystore.has_keys(&[(key.public().to_raw_vec(), KeyTypeId(*b"test"))]));
	}
}
