package wallet

import (
	"context"
	"errors"
	"fmt"
	"math/big"
	"strings"

	"github.com/rmg/iso4217"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/log"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/params"
	"github.com/status-im/status-go/services/wallet/async"
	"github.com/status-im/status-go/services/wallet/bridge"
	"github.com/status-im/status-go/services/wallet/chain"
	"github.com/status-im/status-go/services/wallet/token"
	"github.com/status-im/status-go/services/wallet/transfer"
)

func NewAPI(s *Service) *API {
	router := NewRouter(s)
	return &API{s, s.reader, router}
}

// API is class with methods available over RPC.
type API struct {
	s      *Service
	reader *Reader
	router *Router
}

func (api *API) StartWallet(ctx context.Context) error {
	return api.reader.Start()
}

func (api *API) CheckConnected(ctx context.Context) *ConnectedResult {
	return api.s.CheckConnected(ctx)
}

func (api *API) GetWalletToken(ctx context.Context, addresses []common.Address) (map[common.Address][]Token, error) {
	return api.reader.GetWalletToken(ctx, addresses)
}

type DerivedAddress struct {
	Address        common.Address `json:"address"`
	Path           string         `json:"path"`
	HasActivity    bool           `json:"hasActivity"`
	AlreadyCreated bool           `json:"alreadyCreated"`
}

// SetInitialBlocksRange sets initial blocks range
func (api *API) SetInitialBlocksRange(ctx context.Context) error {
	return api.s.transferController.SetInitialBlocksRange([]uint64{api.s.rpcClient.UpstreamChainID})
}

func (api *API) SetInitialBlocksRangeForChainIDs(ctx context.Context, chainIDs []uint64) error {
	return api.s.transferController.SetInitialBlocksRange(chainIDs)
}

func (api *API) CheckRecentHistory(ctx context.Context, addresses []common.Address) error {
	return api.s.transferController.CheckRecentHistory([]uint64{api.s.rpcClient.UpstreamChainID}, addresses)
}

func (api *API) CheckRecentHistoryForChainIDs(ctx context.Context, chainIDs []uint64, addresses []common.Address) error {
	return api.s.transferController.CheckRecentHistory(chainIDs, addresses)
}

func hexBigToBN(hexBig *hexutil.Big) *big.Int {
	var bN *big.Int
	if hexBig != nil {
		bN = hexBig.ToInt()
	}
	return bN
}

// GetTransfersByAddress returns transfers for a single address
func (api *API) GetTransfersByAddress(ctx context.Context, address common.Address, toBlock, limit *hexutil.Big, fetchMore bool) ([]transfer.View, error) {
	log.Debug("[WalletAPI:: GetTransfersByAddress] get transfers for an address", "address", address)
	var intLimit = int64(1)
	if limit != nil {
		intLimit = limit.ToInt().Int64()
	}
	return api.s.transferController.GetTransfersByAddress(ctx, api.s.rpcClient.UpstreamChainID, address, hexBigToBN(toBlock), intLimit, fetchMore)
}

// LoadTransferByHash loads transfer to the database
func (api *API) LoadTransferByHash(ctx context.Context, address common.Address, hash common.Hash) error {
	log.Debug("[WalletAPI:: LoadTransferByHash] get transfer by hash", "address", address, "hash", hash)
	return api.s.transferController.LoadTransferByHash(ctx, api.s.rpcClient, address, hash)
}

func (api *API) GetTransfersByAddressAndChainID(ctx context.Context, chainID uint64, address common.Address, toBlock, limit *hexutil.Big, fetchMore bool) ([]transfer.View, error) {
	log.Debug("[WalletAPI:: GetTransfersByAddressAndChainIDs] get transfers for an address", "address", address)
	return api.s.transferController.GetTransfersByAddress(ctx, chainID, address, hexBigToBN(toBlock), limit.ToInt().Int64(), fetchMore)
}

func (api *API) GetCachedBalances(ctx context.Context, addresses []common.Address) ([]transfer.LastKnownBlockView, error) {
	return api.s.transferController.GetCachedBalances(ctx, api.s.rpcClient.UpstreamChainID, addresses)
}

func (api *API) GetCachedBalancesbyChainID(ctx context.Context, chainID uint64, addresses []common.Address) ([]transfer.LastKnownBlockView, error) {
	return api.s.transferController.GetCachedBalances(ctx, chainID, addresses)
}

// GetTokensBalances return mapping of token balances for every account.
func (api *API) GetTokensBalances(ctx context.Context, accounts, addresses []common.Address) (map[common.Address]map[common.Address]*hexutil.Big, error) {
	chainClient, err := chain.NewLegacyClient(api.s.rpcClient)
	if err != nil {
		return nil, err
	}
	return api.s.tokenManager.GetBalances(ctx, []*chain.Client{chainClient}, accounts, addresses)
}

func (api *API) GetTokensBalancesForChainIDs(ctx context.Context, chainIDs []uint64, accounts, addresses []common.Address) (map[common.Address]map[common.Address]*hexutil.Big, error) {
	clients, err := chain.NewClients(api.s.rpcClient, chainIDs)
	if err != nil {
		return nil, err
	}
	return api.s.tokenManager.GetBalances(ctx, clients, accounts, addresses)
}

// GetBalanceHistory retrieves native token. Will be extended later to support token balance history
func (api *API) GetBalanceHistory(ctx context.Context, chainID uint64, address common.Address, timeInterval transfer.BalanceHistoryTimeInterval) ([]transfer.BalanceState, error) {
	return api.s.transferController.GetBalanceHistory(ctx, chainID, address, timeInterval)
}

func (api *API) GetTokens(ctx context.Context, chainID uint64) ([]*token.Token, error) {
	log.Debug("call to get tokens")
	rst, err := api.s.tokenManager.GetTokens(chainID)
	log.Debug("result from token store", "len", len(rst))
	return rst, err
}

func (api *API) GetCustomTokens(ctx context.Context) ([]*token.Token, error) {
	log.Debug("call to get custom tokens")
	rst, err := api.s.tokenManager.GetCustoms()
	log.Debug("result from database for custom tokens", "len", len(rst))
	return rst, err
}

func (api *API) DiscoverToken(ctx context.Context, chainID uint64, address common.Address) (*token.Token, error) {
	log.Debug("call to get discover token")
	token, err := api.s.tokenManager.DiscoverToken(ctx, chainID, address)
	return token, err
}

func (api *API) GetVisibleTokens(chainIDs []uint64) (map[uint64][]*token.Token, error) {
	log.Debug("call to get visible tokens")
	rst, err := api.s.tokenManager.GetVisible(chainIDs)
	log.Debug("result from database for visible tokens", "len", len(rst))
	return rst, err
}

func (api *API) ToggleVisibleToken(ctx context.Context, chainID uint64, address common.Address) (bool, error) {
	log.Debug("call to toggle visible tokens")
	err := api.s.tokenManager.Toggle(chainID, address)
	if err != nil {
		return false, err
	}
	return true, nil
}

func (api *API) AddCustomToken(ctx context.Context, token token.Token) error {
	log.Debug("call to create or edit custom token")
	if token.ChainID == 0 {
		token.ChainID = api.s.rpcClient.UpstreamChainID
	}
	err := api.s.tokenManager.UpsertCustom(token)
	log.Debug("result from database for create or edit custom token", "err", err)
	return err
}

func (api *API) DeleteCustomToken(ctx context.Context, address common.Address) error {
	log.Debug("call to remove custom token")
	err := api.s.tokenManager.DeleteCustom(api.s.rpcClient.UpstreamChainID, address)
	log.Debug("result from database for remove custom token", "err", err)
	return err
}

func (api *API) DeleteCustomTokenByChainID(ctx context.Context, chainID uint64, address common.Address) error {
	log.Debug("call to remove custom token")
	err := api.s.tokenManager.DeleteCustom(chainID, address)
	log.Debug("result from database for remove custom token", "err", err)
	return err
}

func (api *API) GetSavedAddresses(ctx context.Context) ([]SavedAddress, error) {
	log.Debug("call to get saved addresses")
	rst, err := api.s.savedAddressesManager.GetSavedAddressesForChainID(api.s.rpcClient.UpstreamChainID)
	log.Debug("result from database for saved addresses", "len", len(rst))
	return rst, err
}

func (api *API) AddSavedAddress(ctx context.Context, sa SavedAddress) error {
	log.Debug("call to create or edit saved address")
	if sa.ChainID == 0 {
		sa.ChainID = api.s.rpcClient.UpstreamChainID
	}
	_, err := api.s.savedAddressesManager.UpdateMetadataAndUpsertSavedAddress(sa)
	log.Debug("result from database for create or edit saved address", "err", err)
	return err
}

func (api *API) DeleteSavedAddress(ctx context.Context, address common.Address) error {
	log.Debug("call to remove saved address")
	_, err := api.s.savedAddressesManager.DeleteSavedAddress(api.s.rpcClient.UpstreamChainID, address)
	log.Debug("result from database for remove saved address", "err", err)
	return err
}

func (api *API) GetPendingTransactions(ctx context.Context) ([]*PendingTransaction, error) {
	log.Debug("call to get pending transactions")
	rst, err := api.s.transactionManager.getAllPendings([]uint64{api.s.rpcClient.UpstreamChainID})
	log.Debug("result from database for pending transactions", "len", len(rst))
	return rst, err
}

func (api *API) GetPendingTransactionsByChainIDs(ctx context.Context, chainIDs []uint64) ([]*PendingTransaction, error) {
	log.Debug("call to get pending transactions")
	rst, err := api.s.transactionManager.getAllPendings(chainIDs)
	log.Debug("result from database for pending transactions", "len", len(rst))
	return rst, err
}

func (api *API) GetPendingOutboundTransactionsByAddress(ctx context.Context, address common.Address) ([]*PendingTransaction, error) {
	log.Debug("call to get pending outbound transactions by address")
	rst, err := api.s.transactionManager.getPendingByAddress([]uint64{api.s.rpcClient.UpstreamChainID}, address)
	log.Debug("result from database for pending transactions by address", "len", len(rst))
	return rst, err
}

func (api *API) GetPendingOutboundTransactionsByAddressAndChainID(ctx context.Context, chainIDs []uint64, address common.Address) ([]*PendingTransaction, error) {
	log.Debug("call to get pending outbound transactions by address")
	rst, err := api.s.transactionManager.getPendingByAddress(chainIDs, address)
	log.Debug("result from database for pending transactions by address", "len", len(rst))
	return rst, err
}

func (api *API) StorePendingTransaction(ctx context.Context, trx PendingTransaction) error {
	log.Debug("call to create or edit pending transaction")
	if trx.ChainID == 0 {
		trx.ChainID = api.s.rpcClient.UpstreamChainID
	}
	err := api.s.transactionManager.addPending(trx)
	log.Debug("result from database for creating or editing a pending transaction", "err", err)
	return err
}

func (api *API) DeletePendingTransaction(ctx context.Context, transactionHash common.Hash) error {
	log.Debug("call to remove pending transaction")
	err := api.s.transactionManager.deletePending(api.s.rpcClient.UpstreamChainID, transactionHash)
	log.Debug("result from database for remove pending transaction", "err", err)
	return err
}

func (api *API) DeletePendingTransactionByChainID(ctx context.Context, chainID uint64, transactionHash common.Hash) error {
	log.Debug("call to remove pending transaction")
	err := api.s.transactionManager.deletePending(chainID, transactionHash)
	log.Debug("result from database for remove pending transaction", "err", err)
	return err
}

func (api *API) WatchTransaction(ctx context.Context, transactionHash common.Hash) error {
	chainClient, err := chain.NewLegacyClient(api.s.rpcClient)
	if err != nil {
		return err
	}
	return api.s.transactionManager.watch(ctx, transactionHash, chainClient)
}

func (api *API) WatchTransactionByChainID(ctx context.Context, chainID uint64, transactionHash common.Hash) error {
	chainClient, err := chain.NewClient(api.s.rpcClient, chainID)
	if err != nil {
		return err
	}
	return api.s.transactionManager.watch(ctx, transactionHash, chainClient)
}

func (api *API) GetCryptoOnRamps(ctx context.Context) ([]CryptoOnRamp, error) {
	return api.s.cryptoOnRampManager.Get()
}

func (api *API) GetOpenseaCollectionsByOwner(ctx context.Context, chainID uint64, owner common.Address) ([]OpenseaCollection, error) {
	log.Debug("call to get opensea collections")
	client, err := newOpenseaClient(chainID, api.s.openseaAPIKey)
	if err != nil {
		return nil, err
	}

	return client.fetchAllCollectionsByOwner(owner)
}

func (api *API) GetOpenseaAssetsByOwnerAndCollection(ctx context.Context, chainID uint64, owner common.Address, collectionSlug string, limit int) ([]OpenseaAsset, error) {
	log.Debug("call to get opensea assets")
	client, err := newOpenseaClient(chainID, api.s.openseaAPIKey)
	if err != nil {
		return nil, err
	}

	return client.fetchAllAssetsByOwnerAndCollection(owner, collectionSlug, limit)
}

func (api *API) AddEthereumChain(ctx context.Context, network params.Network) error {
	log.Debug("call to AddEthereumChain")
	return api.s.rpcClient.NetworkManager.Upsert(&network)
}

func (api *API) DeleteEthereumChain(ctx context.Context, chainID uint64) error {
	log.Debug("call to DeleteEthereumChain")
	return api.s.rpcClient.NetworkManager.Delete(chainID)
}

func (api *API) GetEthereumChains(ctx context.Context, onlyEnabled bool) ([]*params.Network, error) {
	log.Debug("call to GetEthereumChains")
	return api.s.rpcClient.NetworkManager.Get(onlyEnabled)
}

func (api *API) FetchPrices(ctx context.Context, symbols []string, currencies []string) (map[string]map[string]float64, error) {
	log.Debug("call to FetchPrices")
	return api.s.priceManager.FetchPrices(symbols, currencies)
}

func (api *API) GetCachedPrices(ctx context.Context) (map[string]map[string]float64, error) {
	log.Debug("call to GetCachedPrices")
	return api.s.priceManager.GetCachedPrices()
}

func (api *API) FetchMarketValues(ctx context.Context, symbols []string, currencies []string) (map[string]map[string]MarketCoinValues, error) {
	log.Debug("call to FetchMarketValues")
	return api.s.cryptoCompare.fetchTokenMarketValues(symbols, currencies)
}

func (api *API) GetHourlyMarketValues(ctx context.Context, symbol string, currency string, limit int, aggregate int) ([]TokenHistoricalPairs, error) {
	log.Debug("call to GetHourlyMarketValues")
	return api.s.cryptoCompare.fetchHourlyMarketValues(symbol, currency, limit, aggregate)
}

func (api *API) GetDailyMarketValues(ctx context.Context, symbol string, currency string, limit int, allData bool, aggregate int) ([]TokenHistoricalPairs, error) {
	log.Debug("call to GetDailyMarketValues")
	return api.s.cryptoCompare.fetchDailyMarketValues(symbol, currency, limit, allData, aggregate)
}

func (api *API) FetchTokenDetails(ctx context.Context, symbols []string) (map[string]Coin, error) {
	log.Debug("call to FetchTokenDetails")
	return api.s.cryptoCompare.fetchTokenDetails(symbols)
}

func (api *API) GetSuggestedFees(ctx context.Context, chainID uint64) (*SuggestedFees, error) {
	log.Debug("call to GetSuggestedFees")
	return api.s.feesManager.suggestedFees(ctx, chainID)
}

func (api *API) GetTransactionEstimatedTime(ctx context.Context, chainID uint64, maxFeePerGas *big.Float) (TransactionEstimation, error) {
	log.Debug("call to getTransactionEstimatedTime")
	return api.s.feesManager.transactionEstimatedTime(ctx, chainID, maxFeePerGas), nil
}

func (api *API) GetSuggestedRoutes(
	ctx context.Context,
	sendType SendType,
	account common.Address,
	amountIn *hexutil.Big,
	tokenSymbol string,
	disabledFromChainIDs,
	disabledToChaindIDs,
	preferedChainIDs []uint64,
	gasFeeMode GasFeeMode,
	fromLockedAmount map[uint64]*hexutil.Big,
) (*SuggestedRoutes, error) {
	log.Debug("call to GetSuggestedRoutes")
	return api.router.suggestedRoutes(ctx, sendType, account, amountIn.ToInt(), tokenSymbol, disabledFromChainIDs, disabledToChaindIDs, preferedChainIDs, gasFeeMode, fromLockedAmount)
}

func (api *API) GetDerivedAddressesForPath(ctx context.Context, password string, derivedFrom string, path string, pageSize int, pageNumber int) ([]*DerivedAddress, error) {
	info, err := api.s.gethManager.AccountsGenerator().LoadAccount(derivedFrom, password)
	if err != nil {
		return nil, err
	}

	return api.getDerivedAddresses(ctx, info.ID, path, pageSize, pageNumber)
}

func (api *API) GetDerivedAddressesForMnemonicWithPath(ctx context.Context, mnemonic string, path string, pageSize int, pageNumber int) ([]*DerivedAddress, error) {
	mnemonicNoExtraSpaces := strings.Join(strings.Fields(mnemonic), " ")

	info, err := api.s.gethManager.AccountsGenerator().ImportMnemonic(mnemonicNoExtraSpaces, "")
	if err != nil {
		return nil, err
	}

	return api.getDerivedAddresses(ctx, info.ID, path, pageSize, pageNumber)
}

func (api *API) GetDerivedAddressForPrivateKey(ctx context.Context, privateKey string) ([]*DerivedAddress, error) {
	var derivedAddresses = make([]*DerivedAddress, 0)
	info, err := api.s.gethManager.AccountsGenerator().ImportPrivateKey(privateKey)
	if err != nil {
		return derivedAddresses, err
	}

	derivedAddress, err := api.GetDerivedAddressDetails(ctx, info.Address)
	if err != nil {
		return derivedAddresses, err
	}

	derivedAddresses = append(derivedAddresses, derivedAddress)

	return derivedAddresses, nil
}

func (api *API) GetDerivedAddressDetails(ctx context.Context, address string) (*DerivedAddress, error) {
	var derivedAddress *DerivedAddress

	commonAddr := common.HexToAddress(address)
	addressExists, err := api.s.accountsDB.AddressExists(types.Address(commonAddr))
	if err != nil {
		return derivedAddress, err
	}
	if addressExists {
		return derivedAddress, fmt.Errorf("account already exists")
	}

	transactions, err := api.s.transferController.GetTransfersByAddress(ctx, api.s.rpcClient.UpstreamChainID, commonAddr, nil, 1, false)

	if err != nil {
		return derivedAddress, err
	}

	hasActivity := int64(len(transactions)) > 0

	derivedAddress = &DerivedAddress{
		Address:        commonAddr,
		Path:           "",
		HasActivity:    hasActivity,
		AlreadyCreated: addressExists,
	}

	return derivedAddress, nil
}

func (api *API) getDerivedAddresses(ctx context.Context, id string, path string, pageSize int, pageNumber int) ([]*DerivedAddress, error) {
	var (
		group                     = async.NewAtomicGroup(ctx)
		derivedAddresses          = make([]*DerivedAddress, 0)
		unorderedDerivedAddresses = map[int]*DerivedAddress{}
		err                       error
	)

	splitPathValues := strings.Split(path, "/")
	if len(splitPathValues) == 6 {
		derivedAddress, err := api.getDerivedAddress(id, path)
		if err != nil {
			return nil, err
		}
		derivedAddresses = append(derivedAddresses, derivedAddress)
	} else {

		if pageNumber <= 0 || pageSize <= 0 {
			return nil, fmt.Errorf("pageSize and pageNumber should be greater than 0")
		}

		var startIndex = ((pageNumber - 1) * pageSize)
		var endIndex = (pageNumber * pageSize)

		for i := startIndex; i < endIndex; i++ {
			derivedPath := fmt.Sprint(path, "/", i)
			index := i
			group.Add(func(parent context.Context) error {
				derivedAddress, err := api.getDerivedAddress(id, derivedPath)
				if err != nil {
					return err
				}
				unorderedDerivedAddresses[index] = derivedAddress
				return nil
			})
		}
		select {
		case <-group.WaitAsync():
		case <-ctx.Done():
			return nil, ctx.Err()
		}
		for i := startIndex; i < endIndex; i++ {
			derivedAddresses = append(derivedAddresses, unorderedDerivedAddresses[i])
		}
		err = group.Error()
	}
	return derivedAddresses, err
}

func (api *API) getDerivedAddress(id string, derivedPath string) (*DerivedAddress, error) {
	addedAccounts, err := api.s.accountsDB.GetAccounts()
	if err != nil {
		return nil, err
	}

	info, err := api.s.gethManager.AccountsGenerator().DeriveAddresses(id, []string{derivedPath})
	if err != nil {
		return nil, err
	}

	alreadyExists := false
	for _, account := range addedAccounts {
		if types.Address(common.HexToAddress(info[derivedPath].Address)) == account.Address {
			alreadyExists = true
			break
		}
	}

	var ctx context.Context
	transactions, err := api.s.transferController.GetTransfersByAddress(ctx, api.s.rpcClient.UpstreamChainID, common.HexToAddress(info[derivedPath].Address), nil, 1, false)

	if err != nil {
		return nil, err
	}

	hasActivity := int64(len(transactions)) > 0

	address := &DerivedAddress{
		Address:        common.HexToAddress(info[derivedPath].Address),
		Path:           derivedPath,
		HasActivity:    hasActivity,
		AlreadyCreated: alreadyExists,
	}

	return address, nil
}

func (api *API) CreateMultiTransaction(ctx context.Context, multiTransaction *MultiTransaction, data []*bridge.TransactionBridge, password string) (*MultiTransactionResult, error) {
	log.Debug("[WalletAPI:: CreateMultiTransaction] create multi transaction")
	return api.s.transactionManager.createMultiTransaction(ctx, multiTransaction, data, api.router.bridges, password)
}

func (api *API) IsCurrencyFiat(name string) bool {
	code, _ := iso4217.ByName(strings.ToUpper(name))

	return (code != 0)
}

func (api *API) GetFiatCurrencyMinorUnit(name string) (int, error) {
	code, minor := iso4217.ByName(strings.ToUpper(name))

	if code == 0 {
		return code, errors.New("Unknown currency: " + name)
	}

	return minor, nil
}