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    use jsonrpc_core::Error;
    use jsonrpc_macros::Trailing;
    use ser::{Reader, serialize, deserialize};
    use v1::traits::Raw;
    use v1::types::{RawTransaction, TransactionInput, TransactionOutput, TransactionOutputs, Transaction, GetRawTransactionResponse};
    use v1::types::H256;
    use v1::helpers::errors::{execution, invalid_params};
    use chain::Transaction as GlobalTransaction;
    use primitives::bytes::Bytes as GlobalBytes;
    use primitives::hash::H256 as GlobalH256;
    use sync;

    pub struct RawClient<T: RawClientCoreApi> {
    	core: T,
    }

    pub trait RawClientCoreApi: Send + Sync + 'static {
    	fn accept_transaction(&self, transaction: GlobalTransaction) -> Result<GlobalH256, String>;
    	fn create_raw_transaction(&self, inputs: Vec<TransactionInput>, outputs: TransactionOutputs, lock_time: Trailing<u32>) -> Result<GlobalTransaction, String>;
    }

    pub struct RawClientCore {
    	local_sync_node: sync::LocalNodeRef,
    }

    impl RawClientCore {
    	pub fn new(local_sync_node: sync::LocalNodeRef) -> Self {
    		RawClientCore {
    			local_sync_node: local_sync_node,
    		}
    	}

    	pub fn do_create_raw_transaction(inputs: Vec<TransactionInput>, outputs: TransactionOutputs, lock_time: Trailing<u32>) -> Result<GlobalTransaction, String> {
    		use chain;
    		use keys;
    		use global_script::Builder as ScriptBuilder;

    		// to make lock_time work at least one input must have sequnce < SEQUENCE_FINAL
    		let lock_time = lock_time.unwrap_or_default();
    		let default_sequence = if lock_time != 0 { chain::constants::SEQUENCE_FINAL - 1 } else { chain::constants::SEQUENCE_FINAL };

    		// prepare inputs
    		let inputs: Vec<_> = inputs.into_iter()
    			.map(|input| chain::TransactionInput {
    				previous_output: chain::OutPoint {
    					hash: Into::<GlobalH256>::into(input.txid).reversed(),
    					index: input.vout,
    				},
    				script_sig: GlobalBytes::new(), // default script
    				sequence: input.sequence.unwrap_or(default_sequence),
    				script_witness: vec![],
    			}).collect();

    		// prepare outputs
    		let outputs: Vec<_> = outputs.outputs.into_iter()
    			.map(|output| match output {
    					TransactionOutput::Address(with_address) => {
    						let amount_in_satoshis = (with_address.amount * (chain::constants::SATOSHIS_IN_COIN as f64)) as u64;
    						let script = match with_address.address.kind {
    							keys::Type::P2PKH => ScriptBuilder::build_p2pkh(&with_address.address.hash),
    							keys::Type::P2SH => ScriptBuilder::build_p2sh(&with_address.address.hash),
    						};

    						chain::TransactionOutput {
    							value: amount_in_satoshis,
    							script_pubkey: script.to_bytes(),
    						}
    					},
    					TransactionOutput::ScriptData(with_script_data) => {
    						let script = ScriptBuilder::default()
    							.return_bytes(&*with_script_data.script_data)
    							.into_script();

    						chain::TransactionOutput {
    							value: 0,
    							script_pubkey: script.to_bytes(),
    						}
    					},
    				}).collect();

    		// now construct && serialize transaction
    		let transaction = GlobalTransaction {
    			version: 1,
    			inputs: inputs,
    			outputs: outputs,
    			lock_time: lock_time,
    		};

    		Ok(transaction)
    	}
    }

    impl RawClientCoreApi for RawClientCore {
    	fn accept_transaction(&self, transaction: GlobalTransaction) -> Result<GlobalH256, String> {
    		self.local_sync_node.accept_transaction(transaction)
    	}

    	fn create_raw_transaction(&self, inputs: Vec<TransactionInput>, outputs: TransactionOutputs, lock_time: Trailing<u32>) -> Result<GlobalTransaction, String> {
    		RawClientCore::do_create_raw_transaction(inputs, outputs, lock_time)
    	}
    }

    impl<T> RawClient<T> where T: RawClientCoreApi {
    	pub fn new(core: T) -> Self {
    		RawClient {
    			core: core,
    		}
    	}
    }

    impl<T> Raw for RawClient<T> where T: RawClientCoreApi {
    	fn send_raw_transaction(&self, raw_transaction: RawTransaction) -> Result<H256, Error> {
    		let raw_transaction_data: Vec<u8> = raw_transaction.into();
    		let transaction = try!(deserialize(Reader::new(&raw_transaction_data)).map_err(|e| invalid_params("tx", e)));
    		self.core.accept_transaction(transaction)
    			.map(|h| h.reversed().into())
    			.map_err(|e| execution(e))
    	}

    	fn create_raw_transaction(&self, inputs: Vec<TransactionInput>, outputs: TransactionOutputs, lock_time: Trailing<u32>) -> Result<RawTransaction, Error> {
    		// reverse hashes of inputs
    		let inputs: Vec<_> = inputs.into_iter()
    			.map(|mut input| {
    				input.txid = input.txid.reversed();
    				input
    			}).collect();

    		let transaction = try!(self.core.create_raw_transaction(inputs, outputs, lock_time).map_err(|e| execution(e)));
    		let transaction = serialize(&transaction);
    		Ok(transaction.into())
    	}

    	fn decode_raw_transaction(&self, _transaction: RawTransaction) -> Result<Transaction, Error> {
    		rpc_unimplemented!()
    	}

    	fn get_raw_transaction(&self, _hash: H256, _verbose: Trailing<bool>) -> Result<GetRawTransactionResponse, Error> {
    		rpc_unimplemented!()
    	}
    }

    #[cfg(test)]
    pub mod tests {
    	use jsonrpc_macros::Trailing;
    	use jsonrpc_core::IoHandler;
    	use chain::Transaction;
    	use primitives::hash::H256 as GlobalH256;
    	use v1::traits::Raw;
    	use v1::types::{TransactionInput, TransactionOutputs};
    	use super::*;

    	#[derive(Default)]
    	struct SuccessRawClientCore;
    	#[derive(Default)]
    	struct ErrorRawClientCore;

    	impl RawClientCoreApi for SuccessRawClientCore {
    		fn accept_transaction(&self, transaction: Transaction) -> Result<GlobalH256, String> {
    			Ok(transaction.hash())
    		}

    		fn create_raw_transaction(&self, _inputs: Vec<TransactionInput>, _outputs: TransactionOutputs, _lock_time: Trailing<u32>) -> Result<Transaction, String> {
    			Ok("0100000001ad9d38823d95f31dc6c0cb0724c11a3cf5a466ca4147254a10cd94aade6eb5b3230000006b483045022100b7683165c3ecd57b0c44bf6a0fb258dc08c328458321c8fadc2b9348d4e66bd502204fd164c58d1a949a4d39bb380f8f05c9f6b3e9417f06bf72e5c068428ca3578601210391c35ac5ee7cf82c5015229dcff89507f83f9b8c952b8fecfa469066c1cb44ccffffffff0170f30500000000001976a914801da3cb2ed9e44540f4b982bde07cd3fbae264288ac00000000".into())
    		}
    	}

    	impl RawClientCoreApi for ErrorRawClientCore {
    		fn accept_transaction(&self, _transaction: Transaction) -> Result<GlobalH256, String> {
    			Err("error".to_owned())
    		}

    		fn create_raw_transaction(&self, _inputs: Vec<TransactionInput>, _outputs: TransactionOutputs, _lock_time: Trailing<u32>) -> Result<Transaction, String> {
    			Err("error".to_owned())
    		}
    	}

    	#[test]
    	fn sendrawtransaction_accepted() {
    		let client = RawClient::new(SuccessRawClientCore::default());
    		let mut handler = IoHandler::new();
    		handler.extend_with(client.to_delegate());

    		let sample = handler.handle_request_sync(&(r#"
    			{
    				"jsonrpc": "2.0",
    				"method": "sendrawtransaction",
    				"params": ["00000000013ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a0000000000000000000101000000000000000000000000"],
    				"id": 1
    			}"#)
    		).unwrap();

    		// direct hash is 0791efccd035c5fe501023ff888106eba5eff533965de4a6e06400f623bcac34
    		// but client expects reverse hash
    		assert_eq!(r#"{"jsonrpc":"2.0","result":"34acbc23f60064e0a6e45d9633f5efa5eb068188ff231050fec535d0ccef9107","id":1}"#, &sample);
    	}

    	#[test]
    	fn sendrawtransaction_rejected() {
    		let client = RawClient::new(ErrorRawClientCore::default());
    		let mut handler = IoHandler::new();
    		handler.extend_with(client.to_delegate());

    		let sample = handler.handle_request_sync(&(r#"
    			{
    				"jsonrpc": "2.0",
    				"method": "sendrawtransaction",
    				"params": ["00000000013ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a0000000000000000000101000000000000000000000000"],
    				"id": 1
    			}"#)
    		).unwrap();

    		assert_eq!(r#"{"jsonrpc":"2.0","error":{"code":-32015,"message":"Execution error.","data":"\"error\""},"id":1}"#, &sample);
    	}

    	#[test]
    	fn createrawtransaction_success() {
    		let client = RawClient::new(SuccessRawClientCore::default());
    		let mut handler = IoHandler::new();
    		handler.extend_with(client.to_delegate());

    		let sample = handler.handle_request_sync(&(r#"
    			{
    				"jsonrpc": "2.0",
    				"method": "createrawtransaction",
    				"params": [[{"txid":"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b","vout":0}],{"1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa":0.01}],
    				"id": 1
    			}"#)
    		).unwrap();

    		assert_eq!(r#"{"jsonrpc":"2.0","result":"0100000001ad9d38823d95f31dc6c0cb0724c11a3cf5a466ca4147254a10cd94aade6eb5b3230000006b483045022100b7683165c3ecd57b0c44bf6a0fb258dc08c328458321c8fadc2b9348d4e66bd502204fd164c58d1a949a4d39bb380f8f05c9f6b3e9417f06bf72e5c068428ca3578601210391c35ac5ee7cf82c5015229dcff89507f83f9b8c952b8fecfa469066c1cb44ccffffffff0170f30500000000001976a914801da3cb2ed9e44540f4b982bde07cd3fbae264288ac00000000","id":1}"#, &sample);
    	}

    	#[test]
    	fn createrawtransaction_error() {
    		let client = RawClient::new(ErrorRawClientCore::default());
    		let mut handler = IoHandler::new();
    		handler.extend_with(client.to_delegate());

    		let sample = handler.handle_request_sync(&(r#"
    			{
    				"jsonrpc": "2.0",
    				"method": "createrawtransaction",
    				"params": [[{"txid":"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b","vout":0}],{"1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa":0.01}],
    				"id": 1
    			}"#)
    		).unwrap();

    		assert_eq!(r#"{"jsonrpc":"2.0","error":{"code":-32015,"message":"Execution error.","data":"\"error\""},"id":1}"#, &sample);
    	}
    }

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