// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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 dexon-consensus-core 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 dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.

package types

import (
	"sort"
	"testing"

	"github.com/stretchr/testify/suite"
)

type PositionTestSuite struct {
	suite.Suite
}

func (s *PositionTestSuite) TestNewer() {
	pos := Position{
		Round:   1,
		ChainID: 1,
		Height:  1,
	}
	s.Panics(func() {
		pos.Newer(&Position{ChainID: 2})
	})
	s.False(pos.Newer(&Position{
		Round:   2,
		ChainID: 1,
		Height:  0,
	}))
	s.False(pos.Newer(&Position{
		Round:   1,
		ChainID: 1,
		Height:  2,
	}))
	s.True(pos.Newer(&Position{
		Round:   0,
		ChainID: 1,
		Height:  100,
	}))
	s.True(pos.Newer(&Position{
		Round:   1,
		ChainID: 1,
		Height:  0,
	}))
}

func (s *PositionTestSuite) TestSearchInAsendingOrder() {
	positions := []*Position{
		&Position{Round: 0, Height: 1},
		&Position{Round: 0, Height: 2},
		&Position{Round: 0, Height: 3},
		&Position{Round: 2, Height: 0},
		&Position{Round: 2, Height: 1},
		&Position{Round: 2, Height: 2},
		&Position{Round: 4, Height: 0},
		&Position{Round: 4, Height: 1},
		&Position{Round: 4, Height: 2},
	}
	search := func(pos *Position) int {
		return sort.Search(len(positions), func(i int) bool {
			return positions[i].Newer(pos) || positions[i].Equal(pos)
		})
	}
	s.Equal(0, search(&Position{Round: 0, Height: 0}))
	s.Equal(len(positions), search(&Position{Round: 4, Height: 4}))
	s.Equal(0, search(&Position{Round: 0, Height: 1}))
	s.Equal(len(positions)-1, search(&Position{Round: 4, Height: 2}))
	s.Equal(2, search(&Position{Round: 0, Height: 3}))
}

func (s *PositionTestSuite) TestEqual() {
	pos := Position{}
	s.Panics(func() {
		pos.Equal(&Position{ChainID: 1})
	})
	s.True(pos.Equal(&Position{}))
	s.False(pos.Equal(&Position{Round: 1}))
	s.False(pos.Equal(&Position{Height: 1}))
}

func TestPosition(t *testing.T) {
	suite.Run(t, new(PositionTestSuite))
}