// Copyright 2018 The Grin Developers
//
// 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.

//! Main interface into all wallet API functions.
//! Wallet APIs are split into two seperate blocks of functionality
//! called the 'Owner' and 'Foreign' APIs:
//!
//! * The 'Foreign' API contains methods that other wallets will
//! use to interact with the owner's wallet. This API can be exposed
//! to the outside world, with the consideration as to how that can
//! be done securely up to the implementor.
//!
//! Methods in both APIs are intended to be 'single use', that is to say each
//! method will 'open' the wallet (load the keychain with its master seed), perform
//! its operation, then 'close' the wallet (unloading references to the keychain and master
//! seed).

use crate::keychain::Keychain;
use crate::libwallet::api_impl::foreign;
use crate::libwallet::slate::Slate;
use crate::libwallet::types::{BlockFees, CbData, NodeClient, WalletBackend};
use crate::libwallet::Error;
use crate::util::Mutex;
use std::marker::PhantomData;
use std::sync::Arc;

/// Wrapper around external API functions, intended to communicate
/// with other parties
pub struct Foreign<W: ?Sized, C, K>
where
	W: WalletBackend<C, K>,
	C: NodeClient,
	K: Keychain,
{
	/// Wallet, contains its keychain (TODO: Split these up into 2 traits
	/// perhaps)
	pub wallet: Arc<Mutex<W>>,
	/// Flag to normalize some output during testing. Can mostly be ignored.
	pub doctest_mode: bool,
	phantom: PhantomData<K>,
	phantom_c: PhantomData<C>,
}

impl<'a, W: ?Sized, C, K> Foreign<W, C, K>
where
	W: WalletBackend<C, K>,
	C: NodeClient,
	K: Keychain,
{
	/// Create new API instance
	pub fn new(wallet_in: Arc<Mutex<W>>) -> Self {
		Foreign {
			wallet: wallet_in,
			doctest_mode: false,
			phantom: PhantomData,
			phantom_c: PhantomData,
		}
	}

	/// Build a new (potential) coinbase transaction in the wallet
	pub fn build_coinbase(&self, block_fees: &BlockFees) -> Result<CbData, Error> {
		let mut w = self.wallet.lock();
		w.open_with_credentials()?;
		let res = foreign::build_coinbase(&mut *w, block_fees, self.doctest_mode);
		w.close()?;
		res
	}

	/// Verifies all messages in the slate match their public keys
	pub fn verify_slate_messages(&self, slate: &Slate) -> Result<(), Error> {
		foreign::verify_slate_messages(slate)
	}

	/// Receive a transaction from a sender
	pub fn receive_tx(
		&self,
		slate: &mut Slate,
		dest_acct_name: Option<&str>,
		message: Option<String>,
	) -> Result<(), Error> {
		let mut w = self.wallet.lock();
		w.open_with_credentials()?;
		let res = foreign::receive_tx(&mut *w, slate, dest_acct_name, message, self.doctest_mode);
		w.close()?;
		res
	}
}