// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.

//! Parity-specific rpc interface for operations altering the settings.
//! Implementation for light client.

use std::{io, sync::Arc};

use ethereum_types::{H160, H256, U256};
use fetch::{self, Fetch};
use hash::keccak_buffer;
use light::client::LightChainClient;
use sync::ManageNetwork;

use jsonrpc_core::{futures::Future, BoxFuture, Result};
use v1::{
    helpers::errors,
    traits::ParitySet,
    types::{Bytes, ReleaseInfo, Transaction},
};

/// Parity-specific rpc interface for operations altering the settings.
pub struct ParitySetClient<F> {
    client: Arc<dyn LightChainClient>,
    net: Arc<dyn ManageNetwork>,
    fetch: F,
}

impl<F: Fetch> ParitySetClient<F> {
    /// Creates new `ParitySetClient` with given `Fetch`.
    pub fn new(client: Arc<dyn LightChainClient>, net: Arc<dyn ManageNetwork>, fetch: F) -> Self {
        ParitySetClient { client, net, fetch }
    }
}

impl<F: Fetch> ParitySet for ParitySetClient<F> {
    fn set_min_gas_price(&self, _gas_price: U256) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_gas_floor_target(&self, _target: U256) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_gas_ceil_target(&self, _target: U256) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_extra_data(&self, _extra_data: Bytes) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_author(&self, _author: H160) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_engine_signer_secret(&self, _secret: H256) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_transactions_limit(&self, _limit: usize) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_tx_gas_limit(&self, _limit: U256) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn add_reserved_peer(&self, peer: String) -> Result<bool> {
        match self.net.add_reserved_peer(peer) {
            Ok(()) => Ok(true),
            Err(e) => Err(errors::invalid_params("Peer address", e)),
        }
    }

    fn remove_reserved_peer(&self, peer: String) -> Result<bool> {
        match self.net.remove_reserved_peer(peer) {
            Ok(()) => Ok(true),
            Err(e) => Err(errors::invalid_params("Peer address", e)),
        }
    }

    fn drop_non_reserved_peers(&self) -> Result<bool> {
        self.net.deny_unreserved_peers();
        Ok(true)
    }

    fn accept_non_reserved_peers(&self) -> Result<bool> {
        self.net.accept_unreserved_peers();
        Ok(true)
    }

    fn start_network(&self) -> Result<bool> {
        self.net.start_network();
        Ok(true)
    }

    fn stop_network(&self) -> Result<bool> {
        self.net.stop_network();
        Ok(true)
    }

    fn set_mode(&self, _mode: String) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn set_spec_name(&self, spec_name: String) -> Result<bool> {
        self.client
            .set_spec_name(spec_name)
            .map(|_| true)
            .map_err(|()| errors::cannot_restart())
    }

    fn hash_content(&self, url: String) -> BoxFuture<H256> {
        let future = self
            .fetch
            .get(&url, Default::default())
            .then(move |result| {
                result
                    .map_err(errors::fetch)
                    .and_then(move |response| {
                        let mut reader = io::BufReader::new(fetch::BodyReader::new(response));
                        keccak_buffer(&mut reader).map_err(errors::fetch)
                    })
                    .map(Into::into)
            });
        Box::new(future)
    }

    fn upgrade_ready(&self) -> Result<Option<ReleaseInfo>> {
        Err(errors::light_unimplemented(None))
    }

    fn execute_upgrade(&self) -> Result<bool> {
        Err(errors::light_unimplemented(None))
    }

    fn remove_transaction(&self, _hash: H256) -> Result<Option<Transaction>> {
        Err(errors::light_unimplemented(None))
    }
}