package verifier

import (
	"context"
	"math/big"
	"testing"
	"time"

	op_e2e "github.com/exchain/go-exchain/op-e2e"

	"github.com/exchain/go-exchain/op-e2e/e2eutils/wait"
	"github.com/exchain/go-exchain/op-e2e/system/e2esys"
	"github.com/exchain/go-exchain/op-e2e/system/helpers"
	"github.com/exchain/go-exchain/op-service/testlog"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/log"
	"github.com/stretchr/testify/require"
)

func TestSystemE2EDencunAtGenesis(t *testing.T) {
	op_e2e.InitParallel(t)

	cfg := e2esys.DefaultSystemConfig(t)
	cfg.DeployConfig.L1CancunTimeOffset = new(hexutil.Uint64)

	sys, err := cfg.Start(t)
	require.Nil(t, err, "Error starting up system")

	runE2ESystemTest(t, sys)
	head, err := sys.NodeClient("l1").BlockByNumber(context.Background(), big.NewInt(0))
	require.NoError(t, err)
	require.NotNil(t, head.ExcessBlobGas(), "L1 is building dencun blocks since genesis")
}

// TestSystemE2E sets up a L1 Geth node, a rollup node, and a L2 geth node and then confirms that L1 deposits are reflected on L2.
// All nodes are run in process (but are the full nodes, not mocked or stubbed).
func TestSystemE2E(t *testing.T) {
	op_e2e.InitParallel(t)

	cfg := e2esys.DefaultSystemConfig(t)

	sys, err := cfg.Start(t)
	require.Nil(t, err, "Error starting up system")
	runE2ESystemTest(t, sys)

}

func runE2ESystemTest(t *testing.T, sys *e2esys.System) {
	log := testlog.Logger(t, log.LevelInfo)
	log.Info("genesis", "l2", sys.RollupConfig.Genesis.L2, "l1", sys.RollupConfig.Genesis.L1, "l2_time", sys.RollupConfig.Genesis.L2Time)

	l1Client := sys.NodeClient("l1")
	l2Seq := sys.NodeClient("sequencer")
	l2Verif := sys.NodeClient("verifier")

	// Transactor Account
	ethPrivKey := sys.Cfg.Secrets.Alice

	// Send Transaction & wait for success
	fromAddr := sys.Cfg.Secrets.Addresses().Alice

	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	startBalance, err := l2Verif.BalanceAt(ctx, fromAddr, nil)
	require.Nil(t, err)

	// Send deposit transaction
	opts, err := bind.NewKeyedTransactorWithChainID(ethPrivKey, sys.Cfg.L1ChainIDBig())
	require.Nil(t, err)
	mintAmount := big.NewInt(1_000_000_000_000)
	opts.Value = mintAmount
	helpers.SendDepositTx(t, sys.Cfg, l1Client, l2Verif, opts, nil)

	// Confirm balance
	ctx, cancel = context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()

	endBalance, err := wait.ForBalanceChange(ctx, l2Verif, fromAddr, startBalance)
	require.Nil(t, err)

	diff := new(big.Int)
	diff = diff.Sub(endBalance, startBalance)
	require.Equal(t, mintAmount, diff, "Did not get expected balance change")

	// Submit TX to L2 sequencer node
	receipt := helpers.SendL2Tx(t, sys.Cfg, l2Seq, ethPrivKey, func(opts *helpers.TxOpts) {
		opts.Value = big.NewInt(1_000_000_000)
		opts.Nonce = 1 // Already have deposit
		opts.ToAddr = &common.Address{0xff, 0xff}
		opts.VerifyOnClients(l2Verif)
	})

	// Verify blocks match after batch submission on verifiers and sequencers
	verifBlock, err := l2Verif.BlockByNumber(context.Background(), receipt.BlockNumber)
	require.Nil(t, err)
	seqBlock, err := l2Seq.BlockByNumber(context.Background(), receipt.BlockNumber)
	require.Nil(t, err)
	require.Equal(t, verifBlock.NumberU64(), seqBlock.NumberU64(), "Verifier and sequencer blocks not the same after including a batch tx")
	require.Equal(t, verifBlock.ParentHash(), seqBlock.ParentHash(), "Verifier and sequencer blocks parent hashes not the same after including a batch tx")
	require.Equal(t, verifBlock.Hash(), seqBlock.Hash(), "Verifier and sequencer blocks not the same after including a batch tx")

	rollupClient := sys.RollupClient("sequencer")
	// basic check that sync status works
	seqStatus, err := rollupClient.SyncStatus(context.Background())
	require.Nil(t, err)
	require.LessOrEqual(t, seqBlock.NumberU64(), seqStatus.UnsafeL2.Number)
	// basic check that version endpoint works
	seqVersion, err := rollupClient.Version(context.Background())
	require.Nil(t, err)
	require.NotEqual(t, "", seqVersion)
}
