// Copyright (C) 2019-2025, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2015 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 ethapi implements the general Ethereum API functions.
package ethapi

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

	"github.com/ava-labs/libevm/accounts"
	"github.com/ava-labs/libevm/common"
	"github.com/ava-labs/libevm/core/state"
	"github.com/ava-labs/libevm/core/types"
	"github.com/ava-labs/libevm/core/vm"
	"github.com/ava-labs/libevm/ethdb"
	"github.com/ava-labs/libevm/event"
	"github.com/ava-labs/subnet-evm/commontype"
	"github.com/ava-labs/subnet-evm/consensus"
	"github.com/ava-labs/subnet-evm/core"
	"github.com/ava-labs/subnet-evm/core/bloombits"
	"github.com/ava-labs/subnet-evm/params"
	"github.com/ava-labs/subnet-evm/rpc"
)

// Backend interface provides the common API services (that are provided by
// both full and light clients) with access to necessary functions.
type Backend interface {
	// General Ethereum API
	EstimateBaseFee(ctx context.Context) (*big.Int, error)
	SuggestPrice(ctx context.Context) (*big.Int, error)
	SuggestGasTipCap(ctx context.Context) (*big.Int, error)
	FeeHistory(ctx context.Context, blockCount uint64, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*big.Int, [][]*big.Int, []*big.Int, []float64, error)
	ChainDb() ethdb.Database
	AccountManager() *accounts.Manager
	ExtRPCEnabled() bool
	RPCGasCap() uint64            // global gas cap for eth_call over rpc: DoS protection
	RPCEVMTimeout() time.Duration // global timeout for eth_call over rpc: DoS protection
	RPCTxFeeCap() float64         // global tx fee cap for all transaction related APIs

	UnprotectedAllowed(tx *types.Transaction) bool // allows only for EIP155 transactions.

	// Blockchain API
	HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
	HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)
	HeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Header, error)
	CurrentHeader() *types.Header
	CurrentBlock() *types.Header
	BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
	BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
	BlockByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Block, error)
	StateAndHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*state.StateDB, *types.Header, error)
	StateAndHeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*state.StateDB, *types.Header, error)
	GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error)
	GetEVM(ctx context.Context, msg *core.Message, state *state.StateDB, header *types.Header, vmConfig *vm.Config, blockCtx *vm.BlockContext) *vm.EVM
	SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription
	SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
	SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription
	GetFeeConfigAt(parent *types.Header) (commontype.FeeConfig, *big.Int, error)
	BadBlocks() ([]*types.Block, []*core.BadBlockReason)
	IsArchive() bool
	HistoricalProofQueryWindow() uint64

	// Transaction pool API
	SendTx(ctx context.Context, signedTx *types.Transaction) error
	GetTransaction(ctx context.Context, txHash common.Hash) (bool, *types.Transaction, common.Hash, uint64, uint64, error)
	GetPoolTransactions() (types.Transactions, error)
	GetPoolTransaction(txHash common.Hash) *types.Transaction
	GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)
	Stats() (pending int, queued int)
	TxPoolContent() (map[common.Address][]*types.Transaction, map[common.Address][]*types.Transaction)
	TxPoolContentFrom(addr common.Address) ([]*types.Transaction, []*types.Transaction)
	SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription

	ChainConfig() *params.ChainConfig
	Engine() consensus.Engine
	LastAcceptedBlock() *types.Block

	// This is copied from filters.Backend
	// eth/filters needs to be initialized from this backend type, so methods needed by
	// it must also be included here.
	GetBody(ctx context.Context, hash common.Hash, number rpc.BlockNumber) (*types.Body, error)
	GetLogs(ctx context.Context, blockHash common.Hash, number uint64) ([][]*types.Log, error)
	SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription
	SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription
	SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription
	BloomStatus() (uint64, uint64)
	ServiceFilter(ctx context.Context, session *bloombits.MatcherSession)
}

func GetAPIs(apiBackend Backend) []rpc.API {
	nonceLock := new(AddrLocker)
	return []rpc.API{
		{
			Namespace: "eth",
			Service:   NewEthereumAPI(apiBackend),
			Name:      "internal-eth",
		}, {
			Namespace: "eth",
			Service:   NewBlockChainAPI(apiBackend),
			Name:      "internal-blockchain",
		}, {
			Namespace: "eth",
			Service:   NewTransactionAPI(apiBackend, nonceLock),
			Name:      "internal-transaction",
		}, {
			Namespace: "txpool",
			Service:   NewTxPoolAPI(apiBackend),
			Name:      "internal-tx-pool",
		}, {
			Namespace: "debug",
			Service:   NewDebugAPI(apiBackend),
			Name:      "internal-debug",
		}, {
			Namespace: "eth",
			Service:   NewEthereumAccountAPI(apiBackend.AccountManager()),
			Name:      "internal-account",
		}, {
			Namespace: "personal",
			Service:   NewPersonalAccountAPI(apiBackend, nonceLock),
			Name:      "internal-personal",
		},
	}
}
