'use strict';

import assert from "assert";

import { ethers } from "ethers";
import { loadTests } from "@ethersproject/testcases";


const bnify = ethers.BigNumber.from;

function equals(actual: any, expected: any): boolean {

    // Array (treat recursively)
    if (Array.isArray(actual)) {
        if (!Array.isArray(expected) || actual.length !== expected.length) { return false; }
        for (let i = 0; i < actual.length; i++) {
            if (!equals(actual[i], expected[i])) { return false; }
        }
        return true;
    }

    if (typeof(actual) === 'number') { actual = bnify(actual); }
    if (typeof(expected) === 'number') { expected = bnify(expected); }

    // BigNumber
    if (actual.eq) {
        if (typeof(expected) === 'string' && expected.match(/^-?0x[0-9A-Fa-f]*$/)) {
            let neg = (expected.substring(0, 1) === '-');
            if (neg) { expected = expected.substring(1); }
            expected = bnify(expected);
            if (neg) { expected = expected.mul(-1); }
        }
        if (!actual.eq(expected)) { return false; }
        return true;
    }

    // Uint8Array
    if (expected.buffer) {
        if (!ethers.utils.isHexString(actual)) { return false; }
        actual = ethers.utils.arrayify(actual);

        if (!actual.buffer || actual.length !== expected.length) { return false; }
        for (let i = 0; i < actual.length; i++) {
            if (actual[i] !== expected[i]) { return false; }
        }

        return true;
    }

    // Maybe address?
    try {
        let actualAddress = ethers.utils.getAddress(actual);
        let expectedAddress = ethers.utils.getAddress(expected);
        return (actualAddress === expectedAddress);
    } catch (error) { }

    // Something else
    return (actual === expected);
}


function getValues(object: any, named?: boolean): any {
   if (Array.isArray(object)) {
       let result: Array<any> = [];
       object.forEach(function(object) {
           result.push(getValues(object, named));
       });
       return result;
   }

   switch (object.type) {
       case 'number':
           return bnify(object.value);

       case 'boolean':
       case 'string':
           return object.value;

       case 'buffer':
           return ethers.utils.arrayify(object.value);

       case 'tuple':
           let result: Array<any> = getValues(object.value, named);
           if (named) {
               let namedResult: { [ name: string ]: any } = {};
               result.forEach((value, index) => {
                   namedResult['r' + String(index)] = value;
               });
               return namedResult;
           }
           return result;

       default:
           throw new Error('invalid type - ' + object.type);
   }
}

type TestCaseAbi = {
    name: string;

//    interface: Array<any>;
    types: string;
//    indexed: Array<boolean>;
//    data: string;

//    topics: Array<string>;
//    hashed: Array<string>;
    result: string;
    values: string;
    normalizedValues: string;
};

describe('ABI Coder Encoding', function() {
    let coder = ethers.utils.defaultAbiCoder;

    let tests: Array<TestCaseAbi> = loadTests('contract-interface');

    tests.forEach((test) => {
        let values = getValues(JSON.parse(test.normalizedValues));
        let types = JSON.parse(test.types);
        let result = test.result;

        let title = test.name + ' => (' + test.types + ') = (' + test.normalizedValues + ')';

        it(('encodes parameters - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);
            let encoded = coder.encode(types, values);
            assert.equal(encoded, result, 'encoded data - ' + title);
        });
    });
});

describe('ABI Coder Decoding', function() {
    let coder = ethers.utils.defaultAbiCoder;

    let tests: Array<TestCaseAbi> = loadTests('contract-interface');
    tests.forEach((test) => {
        let values = getValues(JSON.parse(test.normalizedValues));
        let types = JSON.parse(test.types);
        let result = test.result;

        let title = test.name + ' => (' + test.types + ') = (' + test.normalizedValues + ')';

        it(('decodes parameters - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);

            let decoded = coder.decode(types, result);

            assert.ok(equals(decoded, values), 'decoded parameters - ' + title);
        });
    });
});

describe('ABI Coder ABIv2 Encoding', function() {
    let coder = ethers.utils.defaultAbiCoder;

    let tests: Array<TestCaseAbi> = loadTests('contract-interface-abi2');
    tests.forEach((test) => {
        let values = getValues(JSON.parse(test.values));
        //let namedValues = getValues(JSON.parse(test.values), true);
        let types = JSON.parse(test.types);
        let expected = test.result;
        let title = test.name + ' => (' + test.types + ') = (' + test.values + ')';

        it(('encodes ABIv2 parameters - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);

            let encoded = coder.encode(types, values);
            assert.equal(encoded, expected, 'encoded positional parameters - ' + title);

            let namedEncoded = coder.encode(types, values);
            assert.equal(namedEncoded, expected, 'encoded named parameters - ' + title);
        });
    });
});

describe('ABI Coder ABIv2 Decoding', function() {

    let coder = ethers.utils.defaultAbiCoder;

    let tests: Array<TestCaseAbi> = loadTests('contract-interface-abi2');

    tests.forEach((test) => {
        let values = getValues(JSON.parse(test.values));
        let types = JSON.parse(test.types);
        let result = test.result;
        let title = test.name + ' => (' + test.types + ') = (' + test.values + ')';

        it(('decodes ABIv2 parameters - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);

            let decoded = coder.decode(types, result);
            assert.ok(equals(decoded, values), 'decoded positional parameters - ' + title);
        });
    });
});

describe('Test Contract Events', function() {
    type TestCase = {
        name: string;

        interface: Array<any>;
        types: Array<any>;
        indexed: Array<boolean>;
        data: string;

        topics: Array<string>;
        hashed: Array<string>;
        normalizedValues: Array<any>;
    };

    let tests: Array<TestCase> = loadTests('contract-events');

    tests.forEach((test, index) => {
        it(('decodes event parameters - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);

            let iface = new ethers.utils.Interface(test.interface);
            let parsed = iface.decodeEventLog(iface.getEvent("testEvent"), test.data, test.topics);

            test.normalizedValues.forEach((expected, index) => {
                if (test.hashed[index]) {
                    assert.ok(equals(parsed[index].hash, expected), 'parsed event indexed parameter matches - ' + index);
                } else {
                    assert.ok(equals(parsed[index], expected), 'parsed event parameter matches - ' + index);
                }
            });
        });
    });

    tests.forEach((test, index) => {
        it(('decodes event data - ' + test.name + ' - ' + test.types), function() {
            this.timeout(120000);

            let iface = new ethers.utils.Interface(test.interface);
            let parsed = iface.decodeEventLog(iface.getEvent("testEvent"), test.data);

            test.normalizedValues.forEach((expected, index) => {
                if (test.indexed[index]) {
                    assert.ok((ethers.Contract.isIndexed(parsed[index]) && parsed[index].hash == null), 'parsed event data has empty Indexed - ' + index);
                } else {
                    assert.ok(equals(parsed[index], expected), 'parsed event data matches - ' + index);
                }
            });
        });
    });

});

describe('Test Interface Signatures', function() {

    type TestCase = {
        abi: Array<any>;
        name: string;
        sigHash: string;
        signature: string;
    };

    let tests: Array<TestCase> = loadTests('contract-signatures');

    tests.forEach((test) => {
        it('derives the correct signature - ' + test.name, function() {
            let iface = new ethers.utils.Interface(test.abi);
            this.timeout(120000);

            assert.equal(iface.getFunction("testSig").format(), test.signature,
                'derived the correct signature');
            assert.equal(iface.getSighash(iface.getFunction("testSig")), test.sigHash,
                'derived the correct signature hash');
        })
    });

    it('derives correct description for human-readable ABI', function() {
        let iface = new ethers.utils.Interface([ "function transfer(address from, uint amount)" ]);
        [
            "transfer",
            "transfer(address,uint256)"
        ].forEach(function(key) {
            let descr = iface.getFunction(key);
            assert.equal(descr.name, "transfer", "incorrect name key - " + key);
            assert.equal(descr.format(), "transfer(address,uint256)", "incorrect signature key - " + key);
            assert.equal(iface.getSighash(descr), "0xa9059cbb", "incorrect sighash key - " + key);
        });
    });

    // See: https://github.com/ethers-io/ethers.js/issues/370
    it ('parses transaction function', function() {
        let iface = new ethers.utils.Interface([ "function transfer(address from, uint amount)" ]);

        // Transaction: 0x820cc57bc77be44d8f4f024a18e18f64a8b6e62a82a3d7897db5970dbe181ba1
        let rawTx = "0xf8aa028502540be4008316e36094334eec1482109bd802d9e72a447848de3bcc106380b844a9059cbb000000000000000000000000851b9167b7cbf772d38efaf89705b35022880a070000000000000000000000000000000000000000000000000de0b6b3a764000026a03200bf26e5f10f7eda59c0aad9adc2334dda79e785b9b004342524d97a66fca9a0450b07a4dc450bb472e08f8370350fa365fcef6db1a95309ae4c06c9d0748092";
        let tx = ethers.utils.parseTransaction(rawTx);

        let descr = iface.parseTransaction(tx);
        assert.equal(descr.args[0], '0x851b9167B7cbf772D38eFaf89705b35022880A07', 'parsed tx - args[0]');
        assert.equal(descr.args[1].toString(), '1000000000000000000', 'parsed tx - args[1]');
        assert.equal(descr.name, 'transfer', 'parsed tx - name');
        assert.equal(descr.signature, 'transfer(address,uint256)', 'parsed tx - signature');
        assert.equal(descr.sighash, '0xa9059cbb', 'parsed tx - sighash');
        assert.equal(descr.value.toString(), '0', 'parsed tx - value');
    });
});

describe('Test Number Coder', function() {
    let coder = ethers.utils.defaultAbiCoder;

    it('null input failed', function() {
        this.timeout(120000);

        assert.throws(() => {
            let result = coder.decode([ 'bool' ], '0x');
            console.log(result);
        }, (error: Error) => {
            assert.equal((<any>error).reason, 'data out-of-bounds', 'got invalid bool');
            return true;
        }, 'null bytes throws an error');
    });

    let overflowAboveHex      = '0x10000000000000000000000000000000000000000000000000000000000000000';
    let overflowBelowHex      = '-0x10000000000000000000000000000000000000000000000000000000000000000';
    let maxHex                =  '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
    let maxLessOneHex         =  '0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe'
    let maxSignedHex          =  '0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
    let maxSignedLessOneHex   =  '0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe'
    let minSignedHex          = '-0x8000000000000000000000000000000000000000000000000000000000000000'
    let minSignedHex2s        =  '0x8000000000000000000000000000000000000000000000000000000000000000'
    let minMoreOneSignedHex   = '-0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
    let minMoreOneSignedHex2s =  '0x8000000000000000000000000000000000000000000000000000000000000001'
    let zeroHex               =  '0x0000000000000000000000000000000000000000000000000000000000000000';
    let oneHex                =  '0x0000000000000000000000000000000000000000000000000000000000000001';

    it('encodes zero', function() {
        let ZeroValues = [
            {n: 'number zero', v: 0},
            { n: 'hex zero', v: '0x0' },
            { n: 'hex leading even length', v: '0x0000' },
            { n: 'hex leading odd length', v: '0x00000' },
            { n: 'BigNumber', v: ethers.constants.Zero }
        ];

        let expected = zeroHex;

        ['uint8', 'uint256', 'int8', 'int256'].forEach(function(type) {
            ZeroValues.forEach(function(value) {
                let result = coder.encode([ type ], [ value.v ]);
                assert.equal(result, expected, value.n + ' ' + type);
            });
        });
    });

    it('encodes one', function() {
        let ZeroValues = [
            {n: 'number', v: 1},
            { n: 'hex', v: '0x1' },
            { n: 'hex leading even length', v: '0x0001' },
            { n: 'hex leading odd length', v: '0x00001' },
            { n: 'BigNumber', v: ethers.constants.One }
        ];

        let expected = oneHex;

        ['uint8', 'uint256', 'int8', 'int256'].forEach(function(type) {
            ZeroValues.forEach(function(value) {
                let result = coder.encode([ type ], [ value.v ]);
                assert.equal(result, expected, value.n + ' ' + type);
            });
        });
    });

    it('encodes negative one', function() {
        let Values = [
            {n: 'number', v: -1},
            { n: 'hex', v: '-0x1' },
            { n: 'hex leading even length', v: '-0x0001' },
            { n: 'hex leading odd length', v: '-0x00001' },
            { n: 'BigNumber', v: ethers.constants.NegativeOne }
        ];

        let expected = maxHex;

        ['int8', 'int256'].forEach(function(type) {
            Values.forEach(function(value) {
                let result = coder.encode([ type ], [ value.v ]);
                assert.equal(result, expected, value.n + ' ' + type);
            });
        });
    });

    it('encodes full uint8 range', function() {
        for (let i = 0; i < 256; i++) {
            let expected = '0x00000000000000000000000000000000000000000000000000000000000000';
            expected += ethers.utils.hexlify(i).substring(2);
            let result = coder.encode([ 'uint8' ], [ i ]);
            assert.equal(result, expected, 'int8 ' + i);
        }
    });

    it('encodes full int8 range', function() {
        for (let i = -128; i < 128; i++) {
            let expected = null;
            if (i === -128) {
                expected = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff80';
            } else if (i < 0) {
                expected = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff';
                expected += ethers.utils.hexlify(256 + i).substring(2);
            } else {
                expected = '0x00000000000000000000000000000000000000000000000000000000000000';
                expected += ethers.utils.hexlify(i).substring(2);
            }
            let result = coder.encode([ 'int8' ], [ i ]);
            assert.equal(result, expected, 'int8 ' + i);
        }
    });

    it('encodes uint256 end range', function() {
        assert.equal(coder.encode([ 'uint256' ], [ bnify(maxHex) ]), maxHex, 'uint256 max');
        assert.equal(coder.encode([ 'uint256' ], [ bnify(maxLessOneHex) ]), maxLessOneHex, 'uint256 max');
    });

    it('encodes int256 end ranges', function() {
        assert.equal(coder.encode([ 'int256' ], [ bnify(maxSignedHex) ]), maxSignedHex, 'int256 max');
        assert.equal(coder.encode([ 'int256' ], [ bnify(maxSignedLessOneHex) ]), maxSignedLessOneHex, 'int256 max');
        assert.equal(coder.encode([ 'int256' ], [ bnify(minSignedHex) ]), minSignedHex2s, 'int256 max');
        assert.equal(coder.encode([ 'int256' ], [ bnify(minMoreOneSignedHex) ]), minMoreOneSignedHex2s, 'int256 max');
    });

    it('fails to encode out-of-range uint8', function() {
        [-128, -127, -2, -1, 256, 1000, bnify(maxHex), bnify(maxSignedHex).add(1), bnify(minSignedHex), bnify(overflowAboveHex), bnify(overflowBelowHex)].forEach(function(value) {

            assert.throws(() => {
                let result = coder.encode([ 'uint8' ], [ value ]);
                console.log('RESULT', value, result);
            }, (error: Error) => {
                assert.equal((<any>error).reason, 'value out-of-bounds', 'wrong error');
                return true;
            }, 'out-of-range numbers throw an error');
        });
    });

    it('fails to encode out-of-range int8', function() {
        [-129, -130, -1000, 128, 129, 1000, bnify(maxHex), bnify(maxSignedHex).add(1), bnify(minSignedHex).sub(1), bnify(overflowAboveHex), bnify(overflowBelowHex)].forEach(function(value) {

            assert.throws(() => {
                let result = coder.encode([ 'int8' ], [ value ]);
                console.log('RESULT', value, result);
            }, (error: Error) => {
                assert.equal((<any>error).reason, 'value out-of-bounds', 'wrong error');
                return true;
            }, 'out-of-range numbers throw an error');
        });
    });

    it('fails to encode out-of-range uint256', function() {
        [-128, -127, -2, -1, bnify(maxHex).add(1), bnify('-' + maxHex), bnify(overflowAboveHex), bnify(overflowBelowHex)].forEach(function(value) {

            assert.throws(() => {
                let result = coder.encode([ 'uint256' ], [ value ]);
                console.log('RESULT', value, result);
            }, (error: Error) => {
                assert.equal((<any>error).reason, 'value out-of-bounds', 'wrong error');
                return true;
            }, 'out-of-range numbers throw an error');
        });
    });

    it('fails to encode out-of-range int256', function() {
        [bnify(maxHex), bnify(maxSignedHex).add(1), bnify(minSignedHex).sub(1), bnify(overflowAboveHex), bnify(overflowBelowHex)].forEach(function(value, index) {

            assert.throws(() => {
                let result = coder.encode([ 'int256' ], [ value ]);
                console.log('RESULT', index, value, result);
            }, (error: Error) => {
                assert.equal((<any>error).reason, 'value out-of-bounds', 'wrong error');
                return true;
            }, 'out-of-range numbers throw an error');
        });
    });

});

describe('Test Fixed Bytes Coder', function() {
    let coder = ethers.utils.defaultAbiCoder;

    let zeroHex =  '0x0000000000000000000000000000000000000000000000000000000000000000';

    it('fails to encode out-of-range bytes4', function() {
        ['0x', '0x00000', '0x000', zeroHex, '0x12345', '0x123456', '0x123', '0x12'].forEach(function(value, index) {
            assert.throws(() => {
                let result = coder.encode([ 'bytes4' ], [ value ]);
                console.log('RESULT', index, value, result);
            }, (error: Error) => {
                if (value.length % 2) {
                     assert.equal((<any>error).reason, 'hex data is odd-length', 'wrong error');
                } else {
                     assert.equal((<any>error).reason, 'incorrect data length', 'wrong error');
                }
                return true;
            }, 'out-of-range fixed bytes throw an error');
        });
    });

    it('fails to encode out-of-range bytes32', function() {
        ['0x', '0x00000', '0x000', '0x12345', '0x123456', (zeroHex + '0'), (zeroHex + '00')].forEach(function(value, index) {
            assert.throws(() => {
                let result = coder.encode([ 'bytes32' ], [ value ]);
                console.log('RESULT', index, value, result);
            }, (error: Error) => {
                if (value.length % 2) {
                     assert.equal((<any>error).reason, 'hex data is odd-length', 'wrong error');
                } else {
                     assert.equal((<any>error).reason, 'incorrect data length', 'wrong error');
                }
                return true;
            }, 'out-of-range fixed bytes throw an error');
        });
    });
});

describe('Test Filters', function() {
    type TestCase = {
        name: string;

        args: Array<any>;

        event: string;
        signature: string;

        expected: Array<any>
    };

    // @TODO: Add a LOT more tests here
    function doTest(test: TestCase) {
        it(test.name, function() {
            let iface = new ethers.utils.Interface([ test.signature ]);
            let eventDescription = iface.getEvent(test.event);
            let filter = iface.encodeFilterTopics(eventDescription, test.args);
            assert.equal(filter.length, test.expected.length, 'filter length matches - ' + test.name);
            filter.forEach((expected, index) => {
                assert.equal(expected, test.expected[index], 'signature topic matches - ' + index + ' - ' + test.name);
            });
        });
    }

    let Tests: Array<TestCase> = [

        // Skips null in non-indexed fields
        // See: https://github.com/ethers-io/ethers.js/issues/305
        {
            name: "creates correct filters for null non-indexed fields",

            args: [ null, 2, null, null ],
            event: "LogSomething",
            signature: "event LogSomething(int hup, int indexed two, bool three, address indexed four)",

            expected: [
                "0xf6b983969813047dce97b9ff8a48cfb0a13306eb2caae2ef186b280bc27491c8",
                "0x0000000000000000000000000000000000000000000000000000000000000002"
            ]
        },

        // https://etherscan.io/tx/0x820cc57bc77be44d8f4f024a18e18f64a8b6e62a82a3d7897db5970dbe181ba1
        {
            name: "transfer filtering from",

            args: [
                "0x59DEa134510ebce4a0c7146595dc8A61Eb9D0D79"
            ],
            event: "Transfer",
            signature: "event Transfer(address indexed from, address indexed to, uint value)",

            expected: [
                "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                "0x00000000000000000000000059dea134510ebce4a0c7146595dc8a61eb9d0d79"
            ]
        },
        {
            name: "transfer filtering to",

            args: [
                null,
                "0x851b9167B7cbf772D38eFaf89705b35022880A07"
            ],
            event: "Transfer",
            signature: "event Transfer(address indexed from, address indexed to, uint value)",

            expected: [
                "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                null,
                "0x000000000000000000000000851b9167b7cbf772d38efaf89705b35022880a07"
            ]
        }
    ];

    Tests.forEach(function(test) {
        doTest(test);
    });
});