import { Order, SignatureType } from '@0x/types';
import { BigNumber } from '@0x/utils';
import * as chai from 'chai';
import { JSONRPCErrorCallback, JSONRPCRequestPayload } from 'ethereum-types';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import 'mocha';

import { generatePseudoRandomSalt, orderHashUtils } from '../src';
import { constants } from '../src/constants';
import { signatureUtils } from '../src/signature_utils';

import { chaiSetup } from './utils/chai_setup';
import { provider, web3Wrapper } from './utils/web3_wrapper';

chaiSetup.configure();
const expect = chai.expect;

describe('Signature utils', () => {
    let makerAddress: string;
    const fakeExchangeContractAddress = '0x1dc4c1cefef38a777b15aa20260a54e584b16c48';
    let order: Order;
    before(async () => {
        const availableAddreses = await web3Wrapper.getAvailableAddressesAsync();
        makerAddress = availableAddreses[0];
        order = {
            makerAddress,
            takerAddress: constants.NULL_ADDRESS,
            senderAddress: constants.NULL_ADDRESS,
            feeRecipientAddress: constants.NULL_ADDRESS,
            makerAssetData: constants.NULL_ADDRESS,
            takerAssetData: constants.NULL_ADDRESS,
            exchangeAddress: fakeExchangeContractAddress,
            salt: new BigNumber(0),
            makerFee: new BigNumber(0),
            takerFee: new BigNumber(0),
            makerAssetAmount: new BigNumber(0),
            takerAssetAmount: new BigNumber(0),
            expirationTimeSeconds: new BigNumber(0),
        };
    });
    describe('#isValidSignatureAsync', () => {
        let dataHex = '0x6927e990021d23b1eb7b8789f6a6feaf98fe104bb0cf8259421b79f9a34222b0';
        const ethSignSignature =
            '0x1B61a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc3340349190569279751135161d22529dc25add4f6069af05be04cacbda2ace225403';
        let address = '0x5409ed021d9299bf6814279a6a1411a7e866a631';

        it("should return false if the data doesn't pertain to the signature & address", async () => {
            const bytes32Zeros = '0x0000000000000000000000000000000000000000000000000000000000000000';
            expect(
                await signatureUtils.isValidSignatureAsync(provider, bytes32Zeros, ethSignSignature, address),
            ).to.be.false();
        });
        it("should return false if the address doesn't pertain to the signature & data", async () => {
            const validUnrelatedAddress = '0x8b0292b11a196601ed2ce54b665cafeca0347d42';
            expect(
                await signatureUtils.isValidSignatureAsync(provider, dataHex, ethSignSignature, validUnrelatedAddress),
            ).to.be.false();
        });
        it("should return false if the signature doesn't pertain to the dataHex & address", async () => {
            const signatureArray = ethSignSignature.split('');
            // tslint:disable-next-line:custom-no-magic-numbers
            signatureArray[5] = 'C'; // V = 28, instead of 27
            const wrongSignature = signatureArray.join('');
            expect(
                await signatureUtils.isValidSignatureAsync(provider, dataHex, wrongSignature, address),
            ).to.be.false();
        });

        it('should throw if signatureType is invalid', () => {
            const signatureArray = ethSignSignature.split('');
            signatureArray[3] = '9'; // SignatureType w/ index 9 doesn't exist
            const signatureWithInvalidType = signatureArray.join('');
            expect(
                signatureUtils.isValidSignatureAsync(provider, dataHex, signatureWithInvalidType, address),
            ).to.be.rejected();
        });

        it('should return true for a valid Ecrecover (EthSign) signature', async () => {
            const isValidSignatureLocal = await signatureUtils.isValidSignatureAsync(
                provider,
                dataHex,
                ethSignSignature,
                address,
            );
            expect(isValidSignatureLocal).to.be.true();
        });

        it('should return true for a valid EIP712 signature', async () => {
            dataHex = '0xa1d7403bcbbcd75ec233cfd6584ff8dabed677d0e9bb32c2bea94e9dd8a109da';
            address = '0x6ecbe1db9ef729cbe972c83fb886247691fb6beb';
            const eip712Signature =
                '0x1bdde07aac4bf12c12ddbb155919c43eba4146a2cfcf904a862950dbebe332554c6674975603eb5a4eaf8fd7f2e06350267e5b36cda9851a89f8bb49fe2fc9afe202';
            const isValidSignatureLocal = await signatureUtils.isValidSignatureAsync(
                provider,
                dataHex,
                eip712Signature,
                address,
            );
            expect(isValidSignatureLocal).to.be.true();
        });

        it.only('should return false if entry not found in `preSigned` mapping', async () => {
            const preSignedSignature = '0x06';
            const isValidSignatureLocal = await signatureUtils.isValidSignatureAsync(
                provider,
                dataHex,
                preSignedSignature,
                address,
            );
            expect(isValidSignatureLocal).to.be.true();
        });
    });
    describe('#isValidECSignature', () => {
        const signature = {
            v: 27,
            r: '0xaca7da997ad177f040240cdccf6905b71ab16b74434388c3a72f34fd25d64393',
            s: '0x46b2bac274ff29b48b3ea6e2d04c1336eaceafda3c53ab483fc3ff12fac3ebf2',
        };
        const data = '0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad';
        const address = '0x0e5cb767cce09a7f3ca594df118aa519be5e2b5a';

        it("should return false if the data doesn't pertain to the signature & address", async () => {
            expect(signatureUtils.isValidECSignature('0x0', signature, address)).to.be.false();
        });
        it("should return false if the address doesn't pertain to the signature & data", async () => {
            const validUnrelatedAddress = '0x8b0292b11a196601ed2ce54b665cafeca0347d42';
            expect(signatureUtils.isValidECSignature(data, signature, validUnrelatedAddress)).to.be.false();
        });
        it("should return false if the signature doesn't pertain to the data & address", async () => {
            const wrongSignature = _.assign({}, signature, { v: 28 });
            expect(signatureUtils.isValidECSignature(data, wrongSignature, address)).to.be.false();
        });
        it('should return true if the signature does pertain to the data & address', async () => {
            const isValidSignatureLocal = signatureUtils.isValidECSignature(data, signature, address);
            expect(isValidSignatureLocal).to.be.true();
        });
    });
    describe('#generateSalt', () => {
        it('generates different salts', () => {
            const isEqual = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
            expect(isEqual).to.be.false();
        });
        it('generates salt in range [0..2^256)', () => {
            const salt = generatePseudoRandomSalt();
            expect(salt.isGreaterThanOrEqualTo(0)).to.be.true();
            // tslint:disable-next-line:custom-no-magic-numbers
            const twoPow256 = new BigNumber(2).pow(256);
            expect(salt.isLessThan(twoPow256)).to.be.true();
        });
    });
    describe('#ecSignOrderAsync', () => {
        it('should default to eth_sign if eth_signTypedData is unavailable', async () => {
            const expectedSignature =
                '0x1c3582f06356a1314dbf1c0e534c4d8e92e59b056ee607a7ff5a825f5f2cc5e6151c5cc7fdd420f5608e4d5bef108e42ad90c7a4b408caef32e24374cf387b0d7603';

            const fakeProvider = {
                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                    if (payload.method === 'eth_signTypedData') {
                        callback(new Error('Internal RPC Error'));
                    } else if (payload.method === 'eth_sign') {
                        const [address, message] = payload.params;
                        const signature = await web3Wrapper.signMessageAsync(address, message);
                        callback(null, {
                            id: 42,
                            jsonrpc: '2.0',
                            result: signature,
                        });
                    } else {
                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
                    }
                },
            };
            const signedOrder = await signatureUtils.ecSignOrderAsync(fakeProvider, order, makerAddress);
            expect(signedOrder.signature).to.equal(expectedSignature);
        });
        it('should throw if the user denies the signing request', async () => {
            const fakeProvider = {
                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                    if (payload.method === 'eth_signTypedData') {
                        callback(new Error('User denied message signature'));
                    } else if (payload.method === 'eth_sign') {
                        const [address, message] = payload.params;
                        const signature = await web3Wrapper.signMessageAsync(address, message);
                        callback(null, {
                            id: 42,
                            jsonrpc: '2.0',
                            result: signature,
                        });
                    } else {
                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
                    }
                },
            };
            expect(signatureUtils.ecSignOrderAsync(fakeProvider, order, makerAddress)).to.to.be.rejectedWith(
                'User denied message signature',
            );
        });
    });
    describe('#ecSignHashAsync', () => {
        before(async () => {
            const availableAddreses = await web3Wrapper.getAvailableAddressesAsync();
            makerAddress = availableAddreses[0];
        });
        it('should return the correct Signature', async () => {
            const orderHash = '0x6927e990021d23b1eb7b8789f6a6feaf98fe104bb0cf8259421b79f9a34222b0';
            const expectedSignature =
                '0x1b61a3ed31b43c8780e905a260a35faefcc527be7516aa11c0256729b5b351bc3340349190569279751135161d22529dc25add4f6069af05be04cacbda2ace225403';
            const ecSignature = await signatureUtils.ecSignHashAsync(provider, orderHash, makerAddress);
            expect(ecSignature).to.equal(expectedSignature);
        });
        it('should return the correct Signature for signatureHex concatenated as R + S + V', async () => {
            const orderHash = '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004';
            const expectedSignature =
                '0x1b117902c86dfb95fe0d1badd983ee166ad259b27acb220174cbb4460d872871137feabdfe76e05924b484789f79af4ee7fa29ec006cedce1bbf369320d034e10b03';

            const fakeProvider = {
                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                    if (payload.method === 'eth_sign') {
                        const [address, message] = payload.params;
                        expect(message).to.equal(orderHash);
                        const signature = await web3Wrapper.signMessageAsync(address, message);
                        // tslint:disable-next-line:custom-no-magic-numbers
                        const rsvHex = `0x${signature.substr(130)}${signature.substr(2, 128)}`;
                        callback(null, {
                            id: 42,
                            jsonrpc: '2.0',
                            result: rsvHex,
                        });
                    } else {
                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
                    }
                },
            };
            const ecSignature = await signatureUtils.ecSignHashAsync(fakeProvider, orderHash, makerAddress);
            expect(ecSignature).to.equal(expectedSignature);
        });
        it('should return the correct Signature for signatureHex concatenated as V + R + S', async () => {
            const orderHash = '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004';
            const expectedSignature =
                '0x1b117902c86dfb95fe0d1badd983ee166ad259b27acb220174cbb4460d872871137feabdfe76e05924b484789f79af4ee7fa29ec006cedce1bbf369320d034e10b03';
            const fakeProvider = {
                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                    if (payload.method === 'eth_sign') {
                        const [address, message] = payload.params;
                        const signature = await web3Wrapper.signMessageAsync(address, message);
                        callback(null, {
                            id: 42,
                            jsonrpc: '2.0',
                            result: signature,
                        });
                    } else {
                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
                    }
                },
            };

            const ecSignature = await signatureUtils.ecSignHashAsync(fakeProvider, orderHash, makerAddress);
            expect(ecSignature).to.equal(expectedSignature);
        });
        it('should return a valid signature', async () => {
            const orderHash = '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004';
            const ecSignature = await signatureUtils.ecSignHashAsync(provider, orderHash, makerAddress);

            const isValidSignature = await signatureUtils.isValidSignatureAsync(
                provider,
                orderHash,
                ecSignature,
                makerAddress,
            );
            expect(isValidSignature).to.be.true();
        });
    });
    describe('#ecSignTypedDataOrderAsync', () => {
        it('should result in the same signature as signing the order hash without an ethereum message prefix', async () => {
            // Note: Since order hash is an EIP712 hash the result of a valid EIP712 signature
            //       of order hash is the same as signing the order without the Ethereum Message prefix.
            const orderHashHex = orderHashUtils.getOrderHashHex(order);
            const sig = ethUtil.ecsign(
                ethUtil.toBuffer(orderHashHex),
                Buffer.from('F2F48EE19680706196E2E339E5DA3491186E0C4C5030670656B0E0164837257D', 'hex'),
            );
            const signatureBuffer = Buffer.concat([
                ethUtil.toBuffer(sig.v),
                ethUtil.toBuffer(sig.r),
                ethUtil.toBuffer(sig.s),
                ethUtil.toBuffer(SignatureType.EIP712),
            ]);
            const signatureHex = `0x${signatureBuffer.toString('hex')}`;
            const signedOrder = await signatureUtils.ecSignTypedDataOrderAsync(provider, order, makerAddress);
            const isValidSignature = await signatureUtils.isValidSignatureAsync(
                provider,
                orderHashHex,
                signedOrder.signature,
                makerAddress,
            );
            expect(signatureHex).to.eq(signedOrder.signature);
            expect(isValidSignature).to.eq(true);
        });
        it('should return the correct Signature for signatureHex concatenated as R + S + V', async () => {
            const expectedSignature =
                '0x1cd472c439833774b55d248c31b6585f21aea1b9363ebb4ec58549e46b62eb5a6f696f5781f62de008ee7f77650ef940d99c97ec1dee67b3f5cea1bbfdfeb2eba602';
            const fakeProvider = {
                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                    if (payload.method === 'eth_signTypedData') {
                        const [address, typedData] = payload.params;
                        const signature = await web3Wrapper.signTypedDataAsync(address, typedData);
                        callback(null, {
                            id: 42,
                            jsonrpc: '2.0',
                            result: signature,
                        });
                    } else {
                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
                    }
                },
            };
            const signedOrder = await signatureUtils.ecSignTypedDataOrderAsync(fakeProvider, order, makerAddress);
            expect(signedOrder.signature).to.equal(expectedSignature);
        });
    });
    describe('#convertECSignatureToSignatureHex', () => {
        const ecSignature: ECSignature = {
            v: 27,
            r: '0xaca7da997ad177f040240cdccf6905b71ab16b74434388c3a72f34fd25d64393',
            s: '0x46b2bac274ff29b48b3ea6e2d04c1336eaceafda3c53ab483fc3ff12fac3ebf2',
        };
        it('should concatenate v,r,s and append the EthSign signature type', async () => {
            const expectedSignatureWithSignatureType =
                '0x1baca7da997ad177f040240cdccf6905b71ab16b74434388c3a72f34fd25d6439346b2bac274ff29b48b3ea6e2d04c1336eaceafda3c53ab483fc3ff12fac3ebf203';
            const signatureWithSignatureType = signatureUtils.convertECSignatureToSignatureHex(ecSignature);
            expect(signatureWithSignatureType).to.equal(expectedSignatureWithSignatureType);
        });
    });
});