package consensus

import (
	"testing"

	"github.com/stretchr/testify/require"
	"github.com/tendermint/tendermint/libs/log"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	"github.com/tendermint/tendermint/types"
)

func peerStateSetup(h, r, v int) *PeerState {
	ps := NewPeerState(log.NewNopLogger(), "testPeerState")
	ps.PRS.Height = int64(h)
	ps.PRS.Round = int32(r)
	ps.ensureVoteBitArrays(int64(h), v)
	return ps
}

func TestSetHasVote(t *testing.T) {
	ps := peerStateSetup(1, 1, 1)
	pva := ps.PRS.Prevotes.Copy()

	// nil vote should return ErrPeerStateNilVote
	err := ps.SetHasVote(nil)
	require.Equal(t, ErrPeerStateSetNilVote, err)

	// the peer giving an invalid index should returns ErrPeerStateInvalidVoteIndex
	v0 := &types.Vote{
		Height:         1,
		ValidatorIndex: -1,
		Round:          1,
		Type:           tmproto.PrevoteType,
	}

	err = ps.SetHasVote(v0)
	require.Equal(t, ErrPeerStateInvalidVoteIndex, err)

	// the peer giving an invalid index should returns ErrPeerStateInvalidVoteIndex
	v1 := &types.Vote{
		Height:         1,
		ValidatorIndex: 1,
		Round:          1,
		Type:           tmproto.PrevoteType,
	}

	err = ps.SetHasVote(v1)
	require.Equal(t, ErrPeerStateInvalidVoteIndex, err)

	// the peer giving a correct index should return nil (vote has been set)
	v2 := &types.Vote{
		Height:         1,
		ValidatorIndex: 0,
		Round:          1,
		Type:           tmproto.PrevoteType,
	}
	require.Nil(t, ps.SetHasVote(v2))

	// verify vote
	pva.SetIndex(0, true)
	require.Equal(t, pva, ps.getVoteBitArray(1, 1, tmproto.PrevoteType))

	// the vote is not in the correct height/round/voteType should return nil (ignore the vote)
	v3 := &types.Vote{
		Height:         2,
		ValidatorIndex: 0,
		Round:          1,
		Type:           tmproto.PrevoteType,
	}
	require.Nil(t, ps.SetHasVote(v3))
	// prevote bitarray has no update
	require.Equal(t, pva, ps.getVoteBitArray(1, 1, tmproto.PrevoteType))
}

func TestApplyHasVoteMessage(t *testing.T) {
	ps := peerStateSetup(1, 1, 1)
	pva := ps.PRS.Prevotes.Copy()

	// ignore the message with an invalid height
	msg := &HasVoteMessage{
		Height: 2,
	}
	require.Nil(t, ps.ApplyHasVoteMessage(msg))

	// apply a message like v2 in TestSetHasVote
	msg2 := &HasVoteMessage{
		Height: 1,
		Index:  0,
		Round:  1,
		Type:   tmproto.PrevoteType,
	}

	require.Nil(t, ps.ApplyHasVoteMessage(msg2))

	// verify vote
	pva.SetIndex(0, true)
	require.Equal(t, pva, ps.getVoteBitArray(1, 1, tmproto.PrevoteType))

	// skip test cases like v & v3 in TestSetHasVote due to the same path
}