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    // Copyright 2015-2017 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::fmt::Debug;
    use std::ops::Deref;
    use rlp;
    use util::{Address, H256, U256, Uint, Bytes};
    use util::bytes::ToPretty;
    use util::sha3::Hashable;

    use ethkey::Signature;
    use ethcore::miner::MinerService;
    use ethcore::client::MiningBlockChainClient;
    use ethcore::transaction::{Action, SignedTransaction, PendingTransaction, Transaction};
    use ethcore::account_provider::AccountProvider;

    use jsonrpc_core::Error;
    use v1::helpers::{errors, TransactionRequest, FilledTransactionRequest, ConfirmationPayload};
    use v1::types::{
    	H256 as RpcH256, H520 as RpcH520, Bytes as RpcBytes,
    	RichRawTransaction as RpcRichRawTransaction,
    	ConfirmationPayload as RpcConfirmationPayload,
    	ConfirmationResponse,
    	SignRequest as RpcSignRequest,
    	DecryptRequest as RpcDecryptRequest,
    };

    pub const DEFAULT_MAC: [u8; 2] = [0, 0];

    type AccountToken = String;

    #[derive(Debug, Clone, PartialEq)]
    pub enum SignWith {
    	Nothing,
    	Password(String),
    	Token(AccountToken),
    }

    #[derive(Debug)]
    pub enum WithToken<T: Debug> {
    	No(T),
    	Yes(T, AccountToken),
    }

    impl<T: Debug> Deref for WithToken<T> {
    	type Target = T;

    	fn deref(&self) -> &Self::Target {
    		match *self {
    			WithToken::No(ref v) => v,
    			WithToken::Yes(ref v, _) => v,
    		}
    	}
    }

    impl<T: Debug> WithToken<T> {
    	pub fn map<S, F>(self, f: F) -> WithToken<S> where
    		S: Debug,
    		F: FnOnce(T) -> S,
    	{
    		match self {
    			WithToken::No(v) => WithToken::No(f(v)),
    			WithToken::Yes(v, token) => WithToken::Yes(f(v), token),
    		}
    	}

    	pub fn into_value(self) -> T {
    		match self {
    			WithToken::No(v) => v,
    			WithToken::Yes(v, _) => v,
    		}
    	}
    }

    impl<T: Debug> From<(T, AccountToken)> for WithToken<T> {
    	fn from(tuple: (T, AccountToken)) -> Self {
    		WithToken::Yes(tuple.0, tuple.1)
    	}
    }

    pub fn execute<C, M>(client: &C, miner: &M, accounts: &AccountProvider, payload: ConfirmationPayload, pass: SignWith) -> Result<WithToken<ConfirmationResponse>, Error>
    	where C: MiningBlockChainClient, M: MinerService
    {
    	match payload {
    		ConfirmationPayload::SendTransaction(request) => {
    			sign_and_dispatch(client, miner, accounts, request, pass)
    				.map(|result| result
    					.map(RpcH256::from)
    					.map(ConfirmationResponse::SendTransaction)
    				)
    		},
    		ConfirmationPayload::SignTransaction(request) => {
    			sign_no_dispatch(client, miner, accounts, request, pass)
    				.map(|result| result
    					.map(RpcRichRawTransaction::from)
    					.map(ConfirmationResponse::SignTransaction)
    				)
    		},
    		ConfirmationPayload::Signature(address, data) => {
    			signature(accounts, address, data.sha3(), pass)
    				.map(|result| result
    					.map(RpcH520::from)
    					.map(ConfirmationResponse::Signature)
    				)
    		},
    		ConfirmationPayload::Decrypt(address, data) => {
    			decrypt(accounts, address, data, pass)
    				.map(|result| result
    					.map(RpcBytes)
    					.map(ConfirmationResponse::Decrypt)
    				)
    		},
    	}
    }

    fn signature(accounts: &AccountProvider, address: Address, hash: H256, password: SignWith) -> Result<WithToken<Signature>, Error> {
    	match password.clone() {
    		SignWith::Nothing => accounts.sign(address, None, hash).map(WithToken::No),
    		SignWith::Password(pass) => accounts.sign(address, Some(pass), hash).map(WithToken::No),
    		SignWith::Token(token) => accounts.sign_with_token(address, token, hash).map(Into::into),
    	}.map_err(|e| match password {
    		SignWith::Nothing => errors::from_signing_error(e),
    		_ => errors::from_password_error(e),
    	})
    }

    fn decrypt(accounts: &AccountProvider, address: Address, msg: Bytes, password: SignWith) -> Result<WithToken<Bytes>, Error> {
    	match password.clone() {
    		SignWith::Nothing => accounts.decrypt(address, None, &DEFAULT_MAC, &msg).map(WithToken::No),
    		SignWith::Password(pass) => accounts.decrypt(address, Some(pass), &DEFAULT_MAC, &msg).map(WithToken::No),
    		SignWith::Token(token) => accounts.decrypt_with_token(address, token, &DEFAULT_MAC, &msg).map(Into::into),
    	}.map_err(|e| match password {
    		SignWith::Nothing => errors::from_signing_error(e),
    		_ => errors::from_password_error(e),
    	})
    }

    pub fn dispatch_transaction<C, M>(client: &C, miner: &M, signed_transaction: PendingTransaction) -> Result<H256, Error>
    	where C: MiningBlockChainClient, M: MinerService {
    	let hash = signed_transaction.transaction.hash();

    	miner.import_own_transaction(client, signed_transaction)
    		.map_err(errors::from_transaction_error)
    		.map(|_| hash)
    }

    pub fn sign_no_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: SignWith) -> Result<WithToken<SignedTransaction>, Error>
    	where C: MiningBlockChainClient, M: MinerService {

    	let network_id = client.signing_network_id();
    	let address = filled.from;
    	let signed_transaction = {
    		let t = Transaction {
    			nonce: filled.nonce
    				.or_else(|| miner
    					.last_nonce(&filled.from)
    					.map(|nonce| nonce + U256::one()))
    				.unwrap_or_else(|| client.latest_nonce(&filled.from)),

    			action: filled.to.map_or(Action::Create, Action::Call),
    			gas: filled.gas,
    			gas_price: filled.gas_price,
    			value: filled.value,
    			data: filled.data,
    		};

    		let hash = t.hash(network_id);
    		let signature = signature(accounts, address, hash, password)?;
    		signature.map(|sig| {
    			SignedTransaction::new(t.with_signature(sig, network_id))
    				.expect("Transaction was signed by AccountsProvider; it never produces invalid signatures; qed")
    		})
    	};
    	Ok(signed_transaction)
    }

    pub fn sign_and_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: SignWith) -> Result<WithToken<H256>, Error>
    	where C: MiningBlockChainClient, M: MinerService
    {

    	let network_id = client.signing_network_id();
    	let min_block = filled.min_block.clone();
    	let signed_transaction = sign_no_dispatch(client, miner, accounts, filled, password)?;

    	let (signed_transaction, token) = match signed_transaction {
    		WithToken::No(signed_transaction) => (signed_transaction, None),
    		WithToken::Yes(signed_transaction, token) => (signed_transaction, Some(token)),
    	};

    	trace!(target: "miner", "send_transaction: dispatching tx: {} for network ID {:?}", rlp::encode(&signed_transaction).to_vec().pretty(), network_id);
    	let pending_transaction = PendingTransaction::new(signed_transaction, min_block);
    	dispatch_transaction(&*client, &*miner, pending_transaction).map(|hash| {
    		match token {
    			Some(ref token) => WithToken::Yes(hash, token.clone()),
    			None => WithToken::No(hash),
    		}
    	})
    }

    pub fn fill_optional_fields<C, M>(request: TransactionRequest, default_sender: Address, client: &C, miner: &M) -> FilledTransactionRequest
    	where C: MiningBlockChainClient, M: MinerService
    {
    	FilledTransactionRequest {
    		from: request.from.unwrap_or(default_sender),
    		used_default_from: request.from.is_none(),
    		to: request.to,
    		nonce: request.nonce,
    		gas_price: request.gas_price.unwrap_or_else(|| default_gas_price(client, miner)),
    		gas: request.gas.unwrap_or_else(|| miner.sensible_gas_limit()),
    		value: request.value.unwrap_or_else(|| 0.into()),
    		data: request.data.unwrap_or_else(Vec::new),
    		min_block: request.min_block,
    	}
    }

    pub fn default_gas_price<C, M>(client: &C, miner: &M) -> U256
    	where C: MiningBlockChainClient, M: MinerService
    {
    	client.gas_price_median(100).unwrap_or_else(|| miner.sensible_gas_price())
    }

    pub fn from_rpc<C, M>(payload: RpcConfirmationPayload, default_account: Address, client: &C, miner: &M) -> ConfirmationPayload
    	where C: MiningBlockChainClient, M: MinerService {

    	match payload {
    		RpcConfirmationPayload::SendTransaction(request) => {
    			ConfirmationPayload::SendTransaction(fill_optional_fields(request.into(), default_account, client, miner))
    		},
    		RpcConfirmationPayload::SignTransaction(request) => {
    			ConfirmationPayload::SignTransaction(fill_optional_fields(request.into(), default_account, client, miner))
    		},
    		RpcConfirmationPayload::Decrypt(RpcDecryptRequest { address, msg }) => {
    			ConfirmationPayload::Decrypt(address.into(), msg.into())
    		},
    		RpcConfirmationPayload::Signature(RpcSignRequest { address, data }) => {
    			ConfirmationPayload::Signature(address.into(), data.into())
    		},
    	}
    }

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