import {BigNumber} from 'bignumber.js';
import * as _ from 'lodash';

import {formatters} from './formatters';
import {Order} from './order';
import {ContractInstance} from './types';

export class ExchangeWrapper {
    private exchange: ContractInstance;
    constructor(exchangeContractInstance: ContractInstance) {
        this.exchange = exchangeContractInstance;
    }
    public async fillOrderAsync(order: Order, from: string,
                                opts: {
                                    fillTakerTokenAmount?: BigNumber;
                                    shouldThrowOnInsufficientBalanceOrAllowance?: boolean;
                                } = {}) {
        const shouldThrowOnInsufficientBalanceOrAllowance = !!opts.shouldThrowOnInsufficientBalanceOrAllowance;
        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance, opts.fillTakerTokenAmount);
        const tx = await this.exchange.fillOrder(
            params.orderAddresses,
            params.orderValues,
            params.fillTakerTokenAmount,
            params.shouldThrowOnInsufficientBalanceOrAllowance,
            params.v,
            params.r,
            params.s,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async cancelOrderAsync(order: Order, from: string,
                                  opts: {cancelTakerTokenAmount?: BigNumber} = {}) {
        const params = order.createCancel(opts.cancelTakerTokenAmount);
        const tx = await this.exchange.cancelOrder(
            params.orderAddresses,
            params.orderValues,
            params.cancelTakerTokenAmount,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async fillOrKillOrderAsync(order: Order, from: string,
                                      opts: {fillTakerTokenAmount?: BigNumber} = {}) {
        const shouldThrowOnInsufficientBalanceOrAllowance = true;
        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance, opts.fillTakerTokenAmount);
        const tx = await this.exchange.fillOrKillOrder(
            params.orderAddresses,
            params.orderValues,
            params.fillTakerTokenAmount,
            params.v,
            params.r,
            params.s,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async batchFillOrdersAsync(orders: Order[], from: string,
                                      opts: {
                                          fillTakerTokenAmounts?: BigNumber[];
                                          shouldThrowOnInsufficientBalanceOrAllowance?: boolean;
                                      } = {}) {
        const shouldThrowOnInsufficientBalanceOrAllowance = !!opts.shouldThrowOnInsufficientBalanceOrAllowance;
        const params = formatters.createBatchFill(
                orders, shouldThrowOnInsufficientBalanceOrAllowance, opts.fillTakerTokenAmounts);
        const tx = await this.exchange.batchFillOrders(
            params.orderAddresses,
            params.orderValues,
            params.fillTakerTokenAmounts,
            params.shouldThrowOnInsufficientBalanceOrAllowance,
            params.v,
            params.r,
            params.s,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async batchFillOrKillOrdersAsync(orders: Order[], from: string,
                                            opts: {fillTakerTokenAmounts?: BigNumber[]} = {}) {
        const params = formatters.createBatchFill(orders, undefined, opts.fillTakerTokenAmounts);
        const tx = await this.exchange.batchFillOrKillOrders(
            params.orderAddresses,
            params.orderValues,
            params.fillTakerTokenAmounts,
            params.v,
            params.r,
            params.s,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async fillOrdersUpToAsync(orders: Order[], from: string,
                                     opts: {
                                        fillTakerTokenAmount?: BigNumber;
                                        shouldThrowOnInsufficientBalanceOrAllowance?: boolean;
                                     } = {}) {
        const shouldThrowOnInsufficientBalanceOrAllowance = !!opts.shouldThrowOnInsufficientBalanceOrAllowance;
        const params = formatters.createFillUpTo(orders,
                                             shouldThrowOnInsufficientBalanceOrAllowance,
                                             opts.fillTakerTokenAmount);
        const tx = await this.exchange.fillOrdersUpTo(
            params.orderAddresses,
            params.orderValues,
            params.fillTakerTokenAmount,
            params.shouldThrowOnInsufficientBalanceOrAllowance,
            params.v,
            params.r,
            params.s,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async batchCancelOrdersAsync(orders: Order[], from: string,
                                        opts: {cancelTakerTokenAmounts?: BigNumber[]} = {}) {
        const params = formatters.createBatchCancel(orders, opts.cancelTakerTokenAmounts);
        const tx = await this.exchange.batchCancelOrders(
            params.orderAddresses,
            params.orderValues,
            params.cancelTakerTokenAmounts,
            {from},
        );
        _.each(tx.logs, log => wrapLogBigNumbers(log));
        return tx;
    }
    public async getOrderHashAsync(order: Order): Promise<string> {
        const shouldThrowOnInsufficientBalanceOrAllowance = false;
        const params = order.createFill(shouldThrowOnInsufficientBalanceOrAllowance);
        const orderHash = await this.exchange.getOrderHash(params.orderAddresses, params.orderValues);
        return orderHash;
    }
    public async isValidSignatureAsync(order: Order): Promise<boolean> {
        const isValidSignature = await this.exchange.isValidSignature(
            order.params.maker,
            order.params.orderHashHex,
            order.params.v,
            order.params.r,
            order.params.s,
        );
        return isValidSignature;
    }
    public async isRoundingErrorAsync(numerator: BigNumber, denominator: BigNumber,
                                      target: BigNumber): Promise<boolean> {
        const isRoundingError = await this.exchange.isRoundingError(numerator, denominator, target);
        return isRoundingError;
    }
    public async getPartialAmountAsync(numerator: BigNumber, denominator: BigNumber,
                                       target: BigNumber): Promise<BigNumber> {
        const partialAmount = new BigNumber(await this.exchange.getPartialAmount(numerator, denominator, target));
        return partialAmount;
    }
}

function wrapLogBigNumbers(log: any): any {
    const argNames = _.keys(log.args);
    for (const argName of argNames) {
        const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber(');
        if (isWeb3BigNumber) {
            log.args[argName] = new BigNumber(log.args[argName]);
        }
    }
}