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// Copyright 2019 Conflux Foundation. All rights reserved.
// Conflux is free software and distributed under GNU General Public License.
// See http://www.gnu.org/licenses/

use crate::{
    message::RequestId,
    sync::{
        message::{
            metrics::BLOCK_HANDLE_TIMER, Context, GetBlocks, GetCompactBlocks,
            Handleable,
        },
        synchronization_protocol_handler::RecoverPublicTask,
        Error,
    },
};
use cfx_types::H256;
use metrics::MeterTimer;
use primitives::Block;
use rlp::{Decodable, DecoderError, Encodable, Rlp, RlpStream};
use rlp_derive::{RlpDecodable, RlpEncodable};
use std::collections::HashSet;

#[derive(Debug, PartialEq, Default, RlpDecodable, RlpEncodable)]
pub struct GetBlocksResponse {
    pub request_id: RequestId,
    pub blocks: Vec<Block>,
}

impl Handleable for GetBlocksResponse {
    fn handle(self, ctx: &Context) -> Result<(), Error> {
        let _timer = MeterTimer::time_func(BLOCK_HANDLE_TIMER.as_ref());

        debug!(
            "on_blocks_response, get block hashes {:?}",
            self.blocks
                .iter()
                .map(|b| b.block_header.hash())
                .collect::<Vec<H256>>()
        );

        // TODO Check block size in advance to avoid attacks causing OOM.
        if ctx.manager.is_block_queue_full() {
            debug!("recover_public_queue is full, discard GetBlocksResponse");
            return Ok(());
        }

        for block in &self.blocks {
            debug!("transaction received by block: ratio=1");
            debug!(
                "new block received: block_header={:?}, tx_count={}, block_size={}",
                block.block_header,
                block.transactions.len(),
                block.size(),
            );
        }

        let req = ctx.match_request(self.request_id)?;
        let delay = req.delay;
        let requested_blocks: HashSet<H256> = req
            .downcast_ref::<GetBlocks>(ctx.io, &ctx.manager.request_manager)?
            .hashes
            .iter()
            .cloned()
            .collect();

        ctx.manager.recover_public_queue.dispatch(
            ctx.io,
            RecoverPublicTask::new(
                self.blocks,
                requested_blocks,
                ctx.node_id.clone(),
                false,
                delay,
            ),
        );

        Ok(())
    }
}

//////////////////////////////////////////////////////////////

#[derive(Debug, PartialEq, Default)]
pub struct GetBlocksWithPublicResponse {
    pub request_id: RequestId,
    pub blocks: Vec<Block>,
}

impl Handleable for GetBlocksWithPublicResponse {
    fn handle(self, ctx: &Context) -> Result<(), Error> {
        debug!(
            "on_blocks_with_public_response, get block hashes {:?}",
            self.blocks
                .iter()
                .map(|b| b.block_header.hash())
                .collect::<Vec<H256>>()
        );
        let req = ctx.match_request(self.request_id)?;
        let delay = req.delay;
        let req_hashes: HashSet<H256> = if let Ok(req) = req
            .downcast_ref::<GetCompactBlocks>(
                ctx.io,
                &ctx.manager.request_manager,
            ) {
            req.hashes.iter().cloned().collect()
        } else {
            let req = req.downcast_ref::<GetBlocks>(
                ctx.io,
                &ctx.manager.request_manager,
            )?;
            req.hashes.iter().cloned().collect()
        };

        ctx.manager.recover_public_queue.dispatch(
            ctx.io,
            RecoverPublicTask::new(
                self.blocks,
                req_hashes,
                ctx.node_id.clone(),
                false, /* compact */
                delay,
            ),
        );

        Ok(())
    }
}

impl Encodable for GetBlocksWithPublicResponse {
    fn rlp_append(&self, stream: &mut RlpStream) {
        stream
            .begin_list(2)
            .append(&self.request_id)
            .begin_list(self.blocks.len());

        for block in self.blocks.iter() {
            stream.begin_list(2).append(&block.block_header);
            stream.begin_list(block.transactions.len());
            for tx in &block.transactions {
                stream.append(tx.as_ref());
            }
        }
    }
}

impl Decodable for GetBlocksWithPublicResponse {
    fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
        let request_id = rlp.val_at(0)?;
        let rlp_blocks = rlp.at(1)?;
        let mut blocks = Vec::new();

        for i in 0..rlp_blocks.item_count()? {
            let rlp_block = rlp_blocks.at(i)?;
            let block = Block::decode_with_tx_public(&rlp_block)
                .expect("Wrong block rlp format!");
            blocks.push(block);
        }

        Ok(GetBlocksWithPublicResponse { request_id, blocks })
    }
}