package shardingconfig

import (
	"math/big"

	"github.com/harmony-one/harmony/internal/genesis"
)

const (
	mainnetEpochBlock1 = 288888
	fiveOne            = 11111
)

// MainnetSchedule is the mainnet sharding configuration schedule.
var MainnetSchedule mainnetSchedule

type mainnetSchedule struct{}

func (mainnetSchedule) InstanceForEpoch(epoch *big.Int) Instance {
	switch {
	//case epoch.Cmp(big.NewInt(1000)) >= 0:
	//	return mainnet6400
	//case epoch.Cmp(big.NewInt(100)) >= 0:
	//	return mainnetV2
	default: // genesis
		return mainnetV0
	}
}

func (mainnetSchedule) BlocksPerEpoch() uint64 {
	return fiveOne
}

func (ms mainnetSchedule) CalcEpochNumber(blockNum uint64) *big.Int {
	blocks := ms.BlocksPerEpoch()
	switch {
	case blockNum >= mainnetEpochBlock1:
		return big.NewInt(int64((blockNum-mainnetEpochBlock1)/blocks) + 1)
	default:
		return big.NewInt(0)
	}
}

func (ms mainnetSchedule) IsLastBlock(blockNum uint64) bool {
	blocks := ms.BlocksPerEpoch()
	switch {
	case blockNum == mainnetEpochBlock1-1:
		return true
	default:
		return ((blockNum-mainnetEpochBlock1)%blocks == blocks-1)
	}
}

var mainnetReshardingEpoch = make([]*big.Int, 0)
var mainnetV0 = MustNewInstance(4, 150, 112, genesis.HarmonyAccounts, genesis.FoundationalNodeAccounts, mainnetReshardingEpoch)

//var mainnetV2 = MustNewInstance(8, 200, 100)
//var mainnet6400 = MustNewInstance(16, 400, 50)