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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::{Message, RequestId},
    sync::{
        message::{
            Context, GetBlockHeadersResponse, Handleable, Key, KeyContainer,
        },
        request_manager::{AsAny, Request},
        Error, ProtocolConfiguration,
    },
};
use cfx_parameters::sync::MAX_HEADERS_TO_SEND;
use cfx_types::H256;
use malloc_size_of_derive::MallocSizeOf as DeriveMallocSizeOf;
use rlp_derive::{RlpDecodable, RlpEncodable};
use std::{any::Any, time::Duration};

#[derive(
    Debug, PartialEq, Clone, RlpDecodable, RlpEncodable, DeriveMallocSizeOf,
)]
pub struct GetBlockHeaders {
    pub request_id: RequestId,
    pub hashes: Vec<H256>,
}

impl AsAny for GetBlockHeaders {
    fn as_any(&self) -> &dyn Any { self }

    fn as_any_mut(&mut self) -> &mut dyn Any { self }
}

impl Request for GetBlockHeaders {
    fn timeout(&self, conf: &ProtocolConfiguration) -> Duration {
        conf.headers_request_timeout
    }

    fn on_removed(&self, inflight_keys: &KeyContainer) {
        let mut inflight_keys = inflight_keys.write(self.msg_id());
        for hash in self.hashes.iter() {
            inflight_keys.remove(&Key::Hash(*hash));
        }
    }

    fn with_inflight(&mut self, inflight_keys: &KeyContainer) {
        let mut inflight_keys = inflight_keys.write(self.msg_id());
        self.hashes.retain(|h| inflight_keys.insert(Key::Hash(*h)));
    }

    fn is_empty(&self) -> bool { self.hashes.is_empty() }

    fn resend(&self) -> Option<Box<dyn Request>> {
        Some(Box::new(self.clone()))
    }
}

impl Handleable for GetBlockHeaders {
    fn handle(self, ctx: &Context) -> Result<(), Error> {
        debug!("Received GetBlockHeaders {:?}", self);
        let headers = self
            .hashes
            .iter()
            .take(MAX_HEADERS_TO_SEND as usize)
            .filter_map(|hash| {
                // We should not use `graph.block_header_by_hash` here because
                // it only returns headers in memory
                ctx.manager
                    .graph
                    .data_man
                    .block_header_by_hash(&hash)
                    .map(|header_arc| header_arc.as_ref().clone())
            })
            .collect();

        let mut block_headers_resp = GetBlockHeadersResponse::default();
        block_headers_resp.request_id = self.request_id;
        block_headers_resp.headers = headers;

        debug!(
            "Returned {:?} block headers to peer {:?}",
            block_headers_resp.headers.len(),
            ctx.node_id,
        );

        ctx.send_response(&block_headers_resp)
    }
}