// Copyright 2014 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 state

import (
	"bytes"
	"encoding/json"
	"testing"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/rawdb"
	"github.com/ethereum/go-ethereum/core/tracing"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethdb"
	"github.com/ethereum/go-ethereum/triedb"
	"github.com/holiman/uint256"
)

type stateEnv struct {
	db    ethdb.Database
	state *StateDB
}

func newStateEnv() *stateEnv {
	db := rawdb.NewMemoryDatabase()
	sdb, _ := New(types.EmptyRootHash, NewDatabase(db), nil)
	return &stateEnv{db: db, state: sdb}
}

func TestDump(t *testing.T) {
	db := rawdb.NewMemoryDatabase()
	tdb := NewDatabaseWithConfig(db, &triedb.Config{Preimages: true})
	sdb, _ := New(types.EmptyRootHash, tdb, nil)
	s := &stateEnv{db: db, state: sdb}

	// generate a few entries
	obj1 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x01}))
	obj1.AddBalance(uint256.NewInt(22), tracing.BalanceChangeUnspecified)
	obj2 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x01, 0x02}))
	obj2.SetCode(crypto.Keccak256Hash([]byte{3, 3, 3, 3, 3, 3, 3}), []byte{3, 3, 3, 3, 3, 3, 3})
	obj3 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x02}))
	obj3.SetBalance(uint256.NewInt(44), tracing.BalanceChangeUnspecified)

	// write some of them to the trie
	s.state.updateStateObject(obj1)
	s.state.updateStateObject(obj2)
	root, _ := s.state.Commit(0, false)

	// check that DumpToCollector contains the state objects that are in trie
	s.state, _ = New(root, tdb, nil)
	got := string(s.state.Dump(nil))
	want := `{
    "root": "71edff0130dd2385947095001c73d9e28d862fc286fca2b922ca6f6f3cddfdd2",
    "accounts": {
        "0x0000000000000000000000000000000000000001": {
            "balance": "22",
            "nonce": 0,
            "root": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
            "codeHash": "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
            "address": "0x0000000000000000000000000000000000000001",
            "key": "0x1468288056310c82aa4c01a7e12a10f8111a0560e72b700555479031b86c357d"
        },
        "0x0000000000000000000000000000000000000002": {
            "balance": "44",
            "nonce": 0,
            "root": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
            "codeHash": "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
            "address": "0x0000000000000000000000000000000000000002",
            "key": "0xd52688a8f926c816ca1e079067caba944f158e764817b83fc43594370ca9cf62"
        },
        "0x0000000000000000000000000000000000000102": {
            "balance": "0",
            "nonce": 0,
            "root": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
            "codeHash": "0x87874902497a5bb968da31a2998d8f22e949d1ef6214bcdedd8bae24cca4b9e3",
            "code": "0x03030303030303",
            "address": "0x0000000000000000000000000000000000000102",
            "key": "0xa17eacbc25cda025e81db9c5c62868822c73ce097cee2a63e33a2e41268358a1"
        }
    }
}`
	if got != want {
		t.Errorf("DumpToCollector mismatch:\ngot: %s\nwant: %s\n", got, want)
	}
}

func TestIterativeDump(t *testing.T) {
	db := rawdb.NewMemoryDatabase()
	tdb := NewDatabaseWithConfig(db, &triedb.Config{Preimages: true})
	sdb, _ := New(types.EmptyRootHash, tdb, nil)
	s := &stateEnv{db: db, state: sdb}

	// generate a few entries
	obj1 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x01}))
	obj1.AddBalance(uint256.NewInt(22), tracing.BalanceChangeUnspecified)
	obj2 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x01, 0x02}))
	obj2.SetCode(crypto.Keccak256Hash([]byte{3, 3, 3, 3, 3, 3, 3}), []byte{3, 3, 3, 3, 3, 3, 3})
	obj3 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x02}))
	obj3.SetBalance(uint256.NewInt(44), tracing.BalanceChangeUnspecified)
	obj4 := s.state.getOrNewStateObject(common.BytesToAddress([]byte{0x00}))
	obj4.AddBalance(uint256.NewInt(1337), tracing.BalanceChangeUnspecified)

	// write some of them to the trie
	s.state.updateStateObject(obj1)
	s.state.updateStateObject(obj2)
	root, _ := s.state.Commit(0, false)
	s.state, _ = New(root, tdb, nil)

	b := &bytes.Buffer{}
	s.state.IterativeDump(nil, json.NewEncoder(b))
	// check that DumpToCollector contains the state objects that are in trie
	got := b.String()
	want := `{"root":"0xd5710ea8166b7b04bc2bfb129d7db12931cee82f75ca8e2d075b4884322bf3de"}
{"balance":"22","nonce":0,"root":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","codeHash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470","address":"0x0000000000000000000000000000000000000001","key":"0x1468288056310c82aa4c01a7e12a10f8111a0560e72b700555479031b86c357d"}
{"balance":"1337","nonce":0,"root":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","codeHash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470","address":"0x0000000000000000000000000000000000000000","key":"0x5380c7b7ae81a58eb98d9c78de4a1fd7fd9535fc953ed2be602daaa41767312a"}
{"balance":"0","nonce":0,"root":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","codeHash":"0x87874902497a5bb968da31a2998d8f22e949d1ef6214bcdedd8bae24cca4b9e3","code":"0x03030303030303","address":"0x0000000000000000000000000000000000000102","key":"0xa17eacbc25cda025e81db9c5c62868822c73ce097cee2a63e33a2e41268358a1"}
{"balance":"44","nonce":0,"root":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","codeHash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470","address":"0x0000000000000000000000000000000000000002","key":"0xd52688a8f926c816ca1e079067caba944f158e764817b83fc43594370ca9cf62"}
`
	if got != want {
		t.Errorf("DumpToCollector mismatch:\ngot: %s\nwant: %s\n", got, want)
	}
}

func TestNull(t *testing.T) {
	s := newStateEnv()
	address := common.HexToAddress("0x823140710bf13990e4500136726d8b55")
	s.state.CreateAccount(address)
	//value := common.FromHex("0x823140710bf13990e4500136726d8b55")
	var value common.Hash

	s.state.SetState(address, common.Hash{}, value)
	s.state.Commit(0, false)

	if value := s.state.GetState(address, common.Hash{}); value != (common.Hash{}) {
		t.Errorf("expected empty current value, got %x", value)
	}
	if value := s.state.GetCommittedState(address, common.Hash{}); value != (common.Hash{}) {
		t.Errorf("expected empty committed value, got %x", value)
	}
}

func TestSnapshot(t *testing.T) {
	stateobjaddr := common.BytesToAddress([]byte("aa"))
	var storageaddr common.Hash
	data1 := common.BytesToHash([]byte{42})
	data2 := common.BytesToHash([]byte{43})
	s := newStateEnv()

	// snapshot the genesis state
	genesis := s.state.Snapshot()

	// set initial state object value
	s.state.SetState(stateobjaddr, storageaddr, data1)
	snapshot := s.state.Snapshot()

	// set a new state object value, revert it and ensure correct content
	s.state.SetState(stateobjaddr, storageaddr, data2)
	s.state.RevertToSnapshot(snapshot)

	if v := s.state.GetState(stateobjaddr, storageaddr); v != data1 {
		t.Errorf("wrong storage value %v, want %v", v, data1)
	}
	if v := s.state.GetCommittedState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong committed storage value %v, want %v", v, common.Hash{})
	}

	// revert up to the genesis state and ensure correct content
	s.state.RevertToSnapshot(genesis)
	if v := s.state.GetState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong storage value %v, want %v", v, common.Hash{})
	}
	if v := s.state.GetCommittedState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong committed storage value %v, want %v", v, common.Hash{})
	}
}

func TestSnapshotEmpty(t *testing.T) {
	s := newStateEnv()
	s.state.RevertToSnapshot(s.state.Snapshot())
}

func TestCreateObjectRevert(t *testing.T) {
	state, _ := New(types.EmptyRootHash, NewDatabase(rawdb.NewMemoryDatabase()), nil)
	addr := common.BytesToAddress([]byte("so0"))
	snap := state.Snapshot()

	state.CreateAccount(addr)
	so0 := state.getStateObject(addr)
	so0.SetBalance(uint256.NewInt(42), tracing.BalanceChangeUnspecified)
	so0.SetNonce(43)
	so0.SetCode(crypto.Keccak256Hash([]byte{'c', 'a', 'f', 'e'}), []byte{'c', 'a', 'f', 'e'})
	state.setStateObject(so0)

	state.RevertToSnapshot(snap)
	if state.Exist(addr) {
		t.Error("Unexpected account after revert")
	}
}