import { ContractWrappersError, ExchangeContractErrs } from '@0xproject/contract-wrappers';
import { OrderError } from '@0xproject/order-utils';
import { constants as sharedConstants, Networks } from '@0xproject/react-shared';
import { ECSignature, Provider } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import * as bowser from 'bowser';
import deepEqual = require('deep-equal');
import * as _ from 'lodash';
import * as moment from 'moment';
import * as numeral from 'numeral';

import {
    AccountState,
    BlockchainCallErrs,
    BrowserType,
    Environments,
    OperatingSystemType,
    Order,
    Providers,
    ProviderType,
    ScreenWidths,
    Side,
    SideToAssetToken,
    Token,
    TokenByAddress,
    TokenState,
} from 'ts/types';
import { configs } from 'ts/utils/configs';
import { constants } from 'ts/utils/constants';
import * as u2f from 'ts/vendor/u2f_api';

export const utils = {
    assert(condition: boolean, message: string): void {
        if (!condition) {
            throw new Error(message);
        }
    },
    isNumeric(n: string): boolean {
        return !isNaN(parseFloat(n)) && isFinite(Number(n));
    },
    // This default unix timestamp is used for orders where the user does not specify an expiry date.
    // It is a fixed constant so that both the redux store's INITIAL_STATE and components can check for
    // whether a user has set an expiry date or not. It is set unrealistically high so as not to collide
    // with actual values a user would select.
    initialOrderExpiryUnixTimestampSec(): BigNumber {
        const m = moment('2050-01-01');
        return new BigNumber(m.unix());
    },
    convertToUnixTimestampSeconds(date: moment.Moment, time?: moment.Moment): BigNumber {
        const finalMoment = date;
        if (!_.isUndefined(time)) {
            finalMoment.hours(time.hours());
            finalMoment.minutes(time.minutes());
        }
        return new BigNumber(finalMoment.unix());
    },
    convertToMomentFromUnixTimestamp(unixTimestampSec: BigNumber): moment.Moment {
        return moment.unix(unixTimestampSec.toNumber());
    },
    convertToReadableDateTimeFromUnixTimestamp(unixTimestampSec: BigNumber): string {
        const m = utils.convertToMomentFromUnixTimestamp(unixTimestampSec);
        const formattedDate: string = m.format('h:MMa MMMM D YYYY');
        return formattedDate;
    },
    generateOrder(
        exchangeContractAddress: string,
        sideToAssetToken: SideToAssetToken,
        expirationUnixTimestampSec: BigNumber,
        orderTakerAddress: string,
        orderMakerAddress: string,
        makerFee: BigNumber,
        takerFee: BigNumber,
        feeRecipient: string,
        ecSignature: ECSignature,
        tokenByAddress: TokenByAddress,
        orderSalt: BigNumber,
    ): Order {
        const makerToken = tokenByAddress[sideToAssetToken[Side.Deposit].address];
        const takerToken = tokenByAddress[sideToAssetToken[Side.Receive].address];
        const order = {
            signedOrder: {
                maker: orderMakerAddress,
                taker: orderTakerAddress,
                makerFee: makerFee.toString(),
                takerFee: takerFee.toString(),
                makerTokenAmount: sideToAssetToken[Side.Deposit].amount.toString(),
                takerTokenAmount: sideToAssetToken[Side.Receive].amount.toString(),
                makerTokenAddress: makerToken.address,
                takerTokenAddress: takerToken.address,
                expirationUnixTimestampSec: expirationUnixTimestampSec.toString(),
                feeRecipient,
                salt: orderSalt.toString(),
                ecSignature,
                exchangeContractAddress,
            },
            metadata: {
                makerToken: {
                    name: makerToken.name,
                    symbol: makerToken.symbol,
                    decimals: makerToken.decimals,
                },
                takerToken: {
                    name: takerToken.name,
                    symbol: takerToken.symbol,
                    decimals: takerToken.decimals,
                },
            },
        };
        return order;
    },
    async sleepAsync(ms: number): Promise<NodeJS.Timer> {
        return new Promise<NodeJS.Timer>(resolve => setTimeout(resolve, ms));
    },
    deepEqual(actual: any, expected: any, opts?: { strict: boolean }): boolean {
        return deepEqual(actual, expected, opts);
    },
    getColSize(items: number): number {
        const bassCssGridSize = 12; // Source: http://basscss.com/#basscss-grid
        const colSize = bassCssGridSize / items;
        if (!_.isInteger(colSize)) {
            throw new Error(`Number of cols must be divisible by ${bassCssGridSize}`);
        }
        return colSize;
    },
    getScreenWidth(): ScreenWidths {
        const documentEl = document.documentElement;
        const body = document.getElementsByTagName('body')[0];
        const widthInPx = window.innerWidth || documentEl.clientWidth || body.clientWidth;
        const bodyStyles: any = window.getComputedStyle(document.querySelector('body'));
        const widthInEm = widthInPx / parseFloat(bodyStyles['font-size']);

        // This logic mirrors the CSS media queries in BassCSS for the `lg-`, `md-` and `sm-` CSS
        // class prefixes. Do not edit these.
        if (widthInEm > ScreenWidths.Lg) {
            return ScreenWidths.Lg;
        } else if (widthInEm > ScreenWidths.Md) {
            return ScreenWidths.Md;
        } else {
            return ScreenWidths.Sm;
        }
    },
    async isU2FSupportedAsync(): Promise<boolean> {
        const w = window as any;
        return new Promise((resolve: (isSupported: boolean) => void) => {
            if (w.u2f && !w.u2f.getApiVersion) {
                // u2f object was found (Firefox with extension)
                resolve(true);
            } else {
                // u2f object was not found. Using Google polyfill
                // HACK: u2f.getApiVersion will simply not return a version if the
                // U2F call fails for any reason. Because of this, we set a hard 3sec
                // timeout to the request on our end.
                const getApiVersionTimeoutMs = 3000;
                const intervalId = setTimeout(() => {
                    resolve(false);
                }, getApiVersionTimeoutMs);
                u2f.getApiVersion((_version: number) => {
                    clearTimeout(intervalId);
                    resolve(true);
                });
            }
        });
    },
    // This checks the error message returned from an injected Web3 instance on the page
    // after a user was prompted to sign a message or send a transaction and decided to
    // reject the request.
    didUserDenyWeb3Request(errMsg: string): boolean {
        const metamaskDenialErrMsg = 'User denied';
        const paritySignerDenialErrMsg = 'Request has been rejected';
        const ledgerDenialErrMsg = 'Invalid status 6985';
        const isUserDeniedErrMsg =
            _.includes(errMsg, metamaskDenialErrMsg) ||
            _.includes(errMsg, paritySignerDenialErrMsg) ||
            _.includes(errMsg, ledgerDenialErrMsg);
        return isUserDeniedErrMsg;
    },
    getAddressBeginAndEnd(address: string): string {
        const truncatedAddress = `${address.substring(0, 6)}...${address.substr(-4)}`; // 0x3d5a...b287
        return truncatedAddress;
    },
    getReadableAccountState(accountState: AccountState, userAddress: string): string {
        switch (accountState) {
            case AccountState.Loading:
                return 'Loading...';
            case AccountState.Ready:
                return utils.getAddressBeginAndEnd(userAddress);
            case AccountState.Locked:
                return 'Please Unlock';
            case AccountState.Disconnected:
                return 'Connect a Wallet';
            default:
                return '';
        }
    },
    getAccountState(
        isBlockchainReady: boolean,
        providerType: ProviderType,
        injectedProviderName: string,
        userAddress?: string,
    ): AccountState {
        const isAddressAvailable = !_.isUndefined(userAddress) && !_.isEmpty(userAddress);
        const isExternallyInjectedProvider = utils.isExternallyInjected(providerType, injectedProviderName);
        if (!isBlockchainReady) {
            return AccountState.Loading;
        } else if (isAddressAvailable) {
            return AccountState.Ready;
            // tslint:disable-next-line: prefer-conditional-expression
        } else if (isExternallyInjectedProvider) {
            return AccountState.Locked;
        } else {
            return AccountState.Disconnected;
        }
    },
    hasUniqueNameAndSymbol(tokens: Token[], token: Token): boolean {
        if (token.isRegistered) {
            return true; // Since it's registered, it is the canonical token
        }
        const registeredTokens = _.filter(tokens, t => t.isRegistered);
        const tokenWithSameNameIfExists = _.find(registeredTokens, {
            name: token.name,
        });
        const isUniqueName = _.isUndefined(tokenWithSameNameIfExists);
        const tokenWithSameSymbolIfExists = _.find(registeredTokens, {
            name: token.symbol,
        });
        const isUniqueSymbol = _.isUndefined(tokenWithSameSymbolIfExists);
        return isUniqueName && isUniqueSymbol;
    },
    zeroExErrToHumanReadableErrMsg(error: ContractWrappersError | ExchangeContractErrs, takerAddress: string): string {
        const ContractWrappersErrorToHumanReadableError: { [error: string]: string } = {
            [ContractWrappersError.ExchangeContractDoesNotExist]: 'Exchange contract does not exist',
            [ContractWrappersError.EtherTokenContractDoesNotExist]: 'EtherToken contract does not exist',
            [ContractWrappersError.TokenTransferProxyContractDoesNotExist]:
                'TokenTransferProxy contract does not exist',
            [ContractWrappersError.TokenRegistryContractDoesNotExist]: 'TokenRegistry contract does not exist',
            [ContractWrappersError.TokenContractDoesNotExist]: 'Token contract does not exist',
            [ContractWrappersError.ZRXContractDoesNotExist]: 'ZRX contract does not exist',
            [BlockchainCallErrs.UserHasNoAssociatedAddresses]: 'User has no addresses available',
            [OrderError.InvalidSignature]: 'Order signature is not valid',
            [ContractWrappersError.ContractNotDeployedOnNetwork]: 'Contract is not deployed on the detected network',
            [ContractWrappersError.InvalidJump]: 'Invalid jump occured while executing the transaction',
            [ContractWrappersError.OutOfGas]: 'Transaction ran out of gas',
        };
        const exchangeContractErrorToHumanReadableError: {
            [error: string]: string;
        } = {
            [ExchangeContractErrs.OrderFillExpired]: 'This order has expired',
            [ExchangeContractErrs.OrderCancelExpired]: 'This order has expired',
            [ExchangeContractErrs.OrderCancelAmountZero]: "Order cancel amount can't be 0",
            [ExchangeContractErrs.OrderAlreadyCancelledOrFilled]:
                'This order has already been completely filled or cancelled',
            [ExchangeContractErrs.OrderFillAmountZero]: "Order fill amount can't be 0",
            [ExchangeContractErrs.OrderRemainingFillAmountZero]:
                'This order has already been completely filled or cancelled',
            [ExchangeContractErrs.OrderFillRoundingError]:
                'Rounding error will occur when filling this order. Please try filling a different amount.',
            [ExchangeContractErrs.InsufficientTakerBalance]:
                'Taker no longer has a sufficient balance to complete this order',
            [ExchangeContractErrs.InsufficientTakerAllowance]:
                'Taker no longer has a sufficient allowance to complete this order',
            [ExchangeContractErrs.InsufficientMakerBalance]:
                'Maker no longer has a sufficient balance to complete this order',
            [ExchangeContractErrs.InsufficientMakerAllowance]:
                'Maker no longer has a sufficient allowance to complete this order',
            [ExchangeContractErrs.InsufficientTakerFeeBalance]: 'Taker no longer has a sufficient balance to pay fees',
            [ExchangeContractErrs.InsufficientTakerFeeAllowance]:
                'Taker no longer has a sufficient allowance to pay fees',
            [ExchangeContractErrs.InsufficientMakerFeeBalance]: 'Maker no longer has a sufficient balance to pay fees',
            [ExchangeContractErrs.InsufficientMakerFeeAllowance]:
                'Maker no longer has a sufficient allowance to pay fees',
            [ExchangeContractErrs.TransactionSenderIsNotFillOrderTaker]: `This order can only be filled by ${takerAddress}`,
            [ExchangeContractErrs.InsufficientRemainingFillAmount]: 'Insufficient remaining fill amount',
        };
        const humanReadableErrorMsg =
            exchangeContractErrorToHumanReadableError[error] || ContractWrappersErrorToHumanReadableError[error];
        return humanReadableErrorMsg;
    },
    isParityNode(nodeVersion: string): boolean {
        return _.includes(nodeVersion, 'Parity');
    },
    isTestRpc(nodeVersion: string): boolean {
        return _.includes(nodeVersion, 'TestRPC');
    },
    isTestNetwork(networkId: number): boolean {
        const isTestNetwork = _.includes(
            [
                sharedConstants.NETWORK_ID_BY_NAME[Networks.Kovan],
                sharedConstants.NETWORK_ID_BY_NAME[Networks.Rinkeby],
                sharedConstants.NETWORK_ID_BY_NAME[Networks.Ropsten],
            ],
            networkId,
        );
        return isTestNetwork;
    },
    getCurrentBaseUrl(): string {
        const port = window.location.port;
        const hasPort = !_.isUndefined(port);
        const baseUrl = `https://${window.location.hostname}${hasPort ? `:${port}` : ''}`;
        return baseUrl;
    },
    onPageLoadPromise: new Promise<void>((resolve, _reject) => {
        if (document.readyState === 'complete') {
            resolve();
            return;
        }
        window.onload = () => resolve();
    }),
    getProviderType(provider: Provider): Providers | string {
        const constructorName = provider.constructor.name;
        let parsedProviderName = constructorName;
        // https://ethereum.stackexchange.com/questions/24266/elegant-way-to-detect-current-provider-int-web3-js
        switch (constructorName) {
            case 'EthereumProvider':
                parsedProviderName = Providers.Mist;
                break;

            default:
                parsedProviderName = constructorName;
                break;
        }
        if ((provider as any).isParity) {
            parsedProviderName = Providers.Parity;
        } else if ((provider as any).isMetaMask) {
            parsedProviderName = Providers.Metamask;
        } else if (!_.isUndefined(_.get(window, 'SOFA'))) {
            parsedProviderName = Providers.Toshi;
        } else if (!_.isUndefined(_.get(window, '__CIPHER__'))) {
            parsedProviderName = Providers.Cipher;
        }
        return parsedProviderName;
    },
    getBackendBaseUrl(): string {
        return utils.isDogfood() ? configs.BACKEND_BASE_STAGING_URL : configs.BACKEND_BASE_PROD_URL;
    },
    isDevelopment(): boolean {
        return _.includes(configs.DOMAINS_DEVELOPMENT, window.location.host);
    },
    isStaging(): boolean {
        return _.includes(window.location.href, configs.DOMAIN_STAGING);
    },
    isExternallyInjected(providerType: ProviderType, injectedProviderName: string): boolean {
        return providerType === ProviderType.Injected && injectedProviderName !== constants.PROVIDER_NAME_PUBLIC;
    },
    isDogfood(): boolean {
        return _.includes(window.location.href, configs.DOMAIN_DOGFOOD);
    },
    isProduction(): boolean {
        return _.includes(window.location.href, configs.DOMAIN_PRODUCTION);
    },
    getEnvironment(): Environments {
        if (utils.isDogfood()) {
            return Environments.DOGFOOD;
        }
        if (utils.isDevelopment()) {
            return Environments.DEVELOPMENT;
        }
        if (utils.isStaging()) {
            return Environments.STAGING;
        }
        if (utils.isProduction()) {
            return Environments.PRODUCTION;
        }
        return Environments.UNKNOWN;
    },
    shouldShowJobsPage(): boolean {
        return utils.isDevelopment() || utils.isStaging() || utils.isDogfood();
    },
    getEthToken(tokenByAddress: TokenByAddress): Token {
        return utils.getTokenBySymbol(constants.ETHER_TOKEN_SYMBOL, tokenByAddress);
    },
    getZrxToken(tokenByAddress: TokenByAddress): Token {
        return utils.getTokenBySymbol(constants.ZRX_TOKEN_SYMBOL, tokenByAddress);
    },
    getTokenBySymbol(symbol: string, tokenByAddress: TokenByAddress): Token {
        const tokens = _.values(tokenByAddress);
        const token = _.find(tokens, { symbol });
        return token;
    },
    getTrackedTokens(tokenByAddress: TokenByAddress): Token[] {
        const allTokens = _.values(tokenByAddress);
        const trackedTokens = _.filter(allTokens, t => utils.isTokenTracked(t));
        return trackedTokens;
    },
    getFormattedAmountFromToken(token: Token, tokenState: TokenState): string {
        return utils.getFormattedAmount(tokenState.balance, token.decimals);
    },
    format(value: BigNumber, format: string): string {
        const formattedAmount = numeral(value).format(format);
        if (_.isNaN(formattedAmount)) {
            // https://github.com/adamwdraper/Numeral-js/issues/596
            return numeral(new BigNumber(0)).format(format);
        }
        return formattedAmount;
    },
    getFormattedAmount(amount: BigNumber, decimals: number): string {
        const unitAmount = Web3Wrapper.toUnitAmount(amount, decimals);
        // if the unit amount is less than 1, show the natural number of decimal places with a max of 4
        // if the unit amount is greater than or equal to 1, show only 2 decimal places
        const lessThanOnePrecision = Math.min(constants.TOKEN_AMOUNT_DISPLAY_PRECISION, unitAmount.decimalPlaces());
        const greaterThanOnePrecision = 2;
        const precision = unitAmount.lt(1) ? lessThanOnePrecision : greaterThanOnePrecision;
        const format = `0,0.${_.repeat('0', precision)}`;
        return utils.format(unitAmount, format);
    },
    getUsdValueFormattedAmount(amount: BigNumber, decimals: number, price: BigNumber): string {
        const unitAmount = Web3Wrapper.toUnitAmount(amount, decimals);
        const value = unitAmount.mul(price);
        return utils.format(value, constants.NUMERAL_USD_FORMAT);
    },
    openUrl(url: string): void {
        window.open(url, '_blank');
    },
    isMobileWidth(screenWidth: ScreenWidths): boolean {
        return screenWidth === ScreenWidths.Sm;
    },
    isMobileOperatingSystem(): boolean {
        return bowser.mobile;
    },
    getBrowserType(): BrowserType {
        if (bowser.chrome) {
            return BrowserType.Chrome;
        } else if (bowser.firefox) {
            return BrowserType.Firefox;
        } else if (bowser.opera) {
            return BrowserType.Opera;
        } else {
            return BrowserType.Other;
        }
    },
    getOperatingSystem(): OperatingSystemType {
        if (bowser.android) {
            return OperatingSystemType.Android;
        } else if (bowser.ios) {
            return OperatingSystemType.iOS;
        } else if (bowser.mac) {
            return OperatingSystemType.Mac;
        } else if (bowser.windows) {
            return OperatingSystemType.Windows;
        } else if (bowser.windowsphone) {
            return OperatingSystemType.WindowsPhone;
        } else if (bowser.linux) {
            return OperatingSystemType.Linux;
        } else {
            return OperatingSystemType.Other;
        }
    },
    isTokenTracked(token: Token): boolean {
        return !_.isUndefined(token.trackedTimestamp);
    },
    // Returns a [downloadLink, isOnMobile] tuple.
    getBestWalletDownloadLinkAndIsMobile(): [string, boolean] {
        const browserType = utils.getBrowserType();
        const isOnMobile = utils.isMobileOperatingSystem();
        const operatingSystem = utils.getOperatingSystem();
        let downloadLink;
        if (isOnMobile) {
            switch (operatingSystem) {
                case OperatingSystemType.Android:
                    downloadLink = constants.URL_TOSHI_ANDROID_APP_STORE;
                    break;
                case OperatingSystemType.iOS:
                    downloadLink = constants.URL_TOSHI_IOS_APP_STORE;
                    break;
                default:
                    // Toshi is only supported on these mobile OSes - just default to iOS
                    downloadLink = constants.URL_TOSHI_IOS_APP_STORE;
            }
        } else {
            switch (browserType) {
                case BrowserType.Chrome:
                    downloadLink = constants.URL_METAMASK_CHROME_STORE;
                    break;
                case BrowserType.Firefox:
                    downloadLink = constants.URL_METAMASK_FIREFOX_STORE;
                    break;
                case BrowserType.Opera:
                    downloadLink = constants.URL_METAMASK_OPERA_STORE;
                    break;
                default:
                    downloadLink = constants.URL_METAMASK_HOMEPAGE;
            }
        }
        return [downloadLink, isOnMobile];
    },
    getTokenIconUrl(symbol: string): string {
        const result = `/images/token_icons/${symbol}.png`;
        return result;
    },
};