// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package backend

import (
	"testing"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/consensus/istanbul"
	"github.com/ethereum/go-ethereum/p2p"
	"github.com/ethereum/go-ethereum/rlp"
	lru "github.com/hashicorp/golang-lru"
)

func TestIstanbulMessage(t *testing.T) {
	_, backend := newBlockChain(1)

	// generate one msg
	data := []byte("data1")
	hash := istanbul.RLPHash(data)
	msg := makeMsg(istanbulMsg, data)
	addr := common.StringToAddress("address")

	// 1. this message should not be in cache
	// for peers
	if _, ok := backend.recentMessages.Get(addr); ok {
		t.Fatalf("the cache of messages for this peer should be nil")
	}

	// for self
	if _, ok := backend.knownMessages.Get(hash); ok {
		t.Fatalf("the cache of messages should be nil")
	}

	// 2. this message should be in cache after we handle it
	_, err := backend.HandleMsg(addr, msg)
	if err != nil {
		t.Fatalf("handle message failed: %v", err)
	}
	// for peers
	if ms, ok := backend.recentMessages.Get(addr); ms == nil || !ok {
		t.Fatalf("the cache of messages for this peer cannot be nil")
	} else if m, ok := ms.(*lru.ARCCache); !ok {
		t.Fatalf("the cache of messages for this peer cannot be casted")
	} else if _, ok := m.Get(hash); !ok {
		t.Fatalf("the cache of messages for this peer cannot be found")
	}

	// for self
	if _, ok := backend.knownMessages.Get(hash); !ok {
		t.Fatalf("the cache of messages cannot be found")
	}
}

func makeMsg(msgcode uint64, data interface{}) p2p.Msg {
	size, r, _ := rlp.EncodeToReader(data)
	return p2p.Msg{Code: msgcode, Size: uint32(size), Payload: r}
}