// Copyright 2015, 2016 Ethcore (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/>.

//! RPC Error codes and error objects

macro_rules! rpc_unimplemented {
	() => (Err(::v1::helpers::errors::unimplemented()))
}

use std::fmt;
use ethcore::error::Error as EthcoreError;
use ethcore::account_provider::{Error as AccountError};
use jsonrpc_core::{Error, ErrorCode, Value};

mod codes {
	// NOTE [ToDr] Codes from [-32099, -32000]
	pub const UNSUPPORTED_REQUEST: i64 = -32000;
	pub const NO_WORK: i64 = -32001;
	pub const NO_AUTHOR: i64 = -32002;
	pub const NO_NEW_WORK: i64 = -32003;
	pub const UNKNOWN_ERROR: i64 = -32009;
	pub const TRANSACTION_ERROR: i64 = -32010;
	pub const ACCOUNT_LOCKED: i64 = -32020;
	pub const PASSWORD_INVALID: i64 = -32021;
	pub const ACCOUNT_ERROR: i64 = -32023;
	pub const SIGNER_DISABLED: i64 = -32030;
	pub const REQUEST_REJECTED: i64 = -32040;
	pub const REQUEST_REJECTED_LIMIT: i64 = -32041;
	pub const REQUEST_NOT_FOUND: i64 = -32042;
	pub const COMPILATION_ERROR: i64 = -32050;
}

pub fn unimplemented() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::UNSUPPORTED_REQUEST),
		message: "This request is not implemented yet. Please create an issue on Github repo.".into(),
		data: None
	}
}

pub fn request_not_found() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::REQUEST_NOT_FOUND),
		message: "Request not found.".into(),
		data: None,
	}
}

pub fn request_rejected() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::REQUEST_REJECTED),
		message: "Request has been rejected.".into(),
		data: None,
	}
}

pub fn request_rejected_limit() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::REQUEST_REJECTED_LIMIT),
		message: "Request has been rejected because of queue limit.".into(),
		data: None,
	}
}

pub fn account<T: fmt::Debug>(error: &str, details: T) -> Error {
	Error {
		code: ErrorCode::ServerError(codes::ACCOUNT_ERROR),
		message: error.into(),
		data: Some(Value::String(format!("{:?}", details))),
	}
}

pub fn compilation<T: fmt::Debug>(error: T) -> Error {
	Error {
		code: ErrorCode::ServerError(codes::COMPILATION_ERROR),
		message: "Error while compiling code.".into(),
		data: Some(Value::String(format!("{:?}", error))),
	}
}

pub fn internal<T: fmt::Debug>(error: &str, data: T) -> Error {
	Error {
		code: ErrorCode::InternalError,
		message: format!("Internal error occurred: {}", error),
		data: Some(Value::String(format!("{:?}", data))),
	}
}

pub fn invalid_params<T: fmt::Debug>(param: &str, details: T) -> Error {
	Error {
		code: ErrorCode::InvalidParams,
		message: format!("Couldn't parse parameters: {}", param),
		data: Some(Value::String(format!("{:?}", details))),
	}
}

pub fn state_pruned() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::UNSUPPORTED_REQUEST),
		message: "This request is not supported because your node is running with state pruning. Run with --pruning=archive.".into(),
		data: None
	}
}

pub fn no_work() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::NO_WORK),
		message: "Still syncing.".into(),
		data: None
	}
}

pub fn no_new_work() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::NO_NEW_WORK),
		message: "Work has not changed.".into(),
		data: None
	}
}

pub fn no_author() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::NO_AUTHOR),
		message: "Author not configured. Run Parity with --author to configure.".into(),
		data: None
	}
}


pub fn signer_disabled() -> Error {
	Error {
		code: ErrorCode::ServerError(codes::SIGNER_DISABLED),
		message: "Trusted Signer is disabled. This API is not available.".into(),
		data: None
	}
}

pub fn from_signing_error(error: AccountError) -> Error {
	Error {
		code: ErrorCode::ServerError(codes::ACCOUNT_LOCKED),
		message: "Your account is locked. Unlock the account via CLI, personal_unlockAccount or use Trusted Signer.".into(),
		data: Some(Value::String(format!("{:?}", error))),
	}
}

pub fn from_password_error(error: AccountError) -> Error {
	Error {
		code: ErrorCode::ServerError(codes::PASSWORD_INVALID),
		message: "Account password is invalid or account does not exist.".into(),
		data: Some(Value::String(format!("{:?}", error))),
	}
}

pub fn from_transaction_error(error: EthcoreError) -> Error {
	use ethcore::error::TransactionError::*;

	if let EthcoreError::Transaction(e) = error {
		let msg = match e {
			AlreadyImported => "Transaction with the same hash was already imported.".into(),
			Old => "Transaction nonce is too low. Try incrementing the nonce.".into(),
			TooCheapToReplace => {
				"Transaction fee is too low. There is another transaction with same nonce in the queue. Try increasing the fee or incrementing the nonce.".into()
			},
			LimitReached => {
				"There are too many transactions in the queue. Your transaction was dropped due to limit. Try increasing the fee.".into()
			},
			InsufficientGasPrice { minimal, got } => {
				format!("Transaction fee is too low. It does not satisfy your node's minimal fee (minimal: {}, got: {}). Try increasing the fee.", minimal, got)
			},
			InsufficientBalance { balance, cost } => {
				format!("Insufficient funds. Account you try to send transaction from does not have enough funds. Required {} and got: {}.", cost, balance)
			},
			GasLimitExceeded { limit, got } => {
				format!("Transaction cost exceeds current gas limit. Limit: {}, got: {}. Try decreasing supplied gas.", limit, got)
			},
			InvalidGasLimit(_) => "Supplied gas is beyond limit.".into(),
		};
		Error {
			code: ErrorCode::ServerError(codes::TRANSACTION_ERROR),
			message: msg,
			data: None,
		}
	} else {
		Error {
			code: ErrorCode::ServerError(codes::UNKNOWN_ERROR),
			message: "Unknown error when sending transaction.".into(),
			data: Some(Value::String(format!("{:?}", error))),
		}
	}
}