import chai from 'chai';
import {
  decode,
  encode
} from '../cborg.js';
import {
  fromHex,
  toHex
} from '../lib/byte-utils.js';
const {assert} = chai;
const fixtures = [
  {
    data: '00',
    expected: 0,
    type: 'uint8'
  },
  {
    data: '02',
    expected: 2,
    type: 'uint8'
  },
  {
    data: '18ff',
    expected: 255,
    type: 'uint8'
  },
  {
    data: '1901f4',
    expected: 500,
    type: 'uint16'
  },
  {
    data: '1900ff',
    expected: 255,
    type: 'uint16',
    strict: false
  },
  {
    data: '19ffff',
    expected: 65535,
    type: 'uint16'
  },
  {
    data: '1a000000ff',
    expected: 255,
    type: 'uint32',
    strict: false
  },
  {
    data: '1a00010000',
    expected: 65536,
    type: 'uint32'
  },
  {
    data: '1a000f4240',
    expected: 1000000,
    type: 'uint32'
  },
  {
    data: '1aa5f702b3',
    expected: 2784428723,
    type: 'uint32'
  },
  {
    data: '1b00000000000000ff',
    expected: 255,
    type: 'uint64',
    strict: false
  },
  {
    data: '1b0016db6db6db6db7',
    expected: Number.MAX_SAFE_INTEGER / 1.4,
    type: 'uint64'
  },
  {
    data: '1b001fffffffffffff',
    expected: Number.MAX_SAFE_INTEGER,
    type: 'uint64'
  },
  {
    data: '1ba5f702b3a5f702b3',
    expected: BigInt('11959030306112471731'),
    type: 'uint64'
  },
  {
    data: '1bffffffffffffffff',
    expected: BigInt('18446744073709551615'),
    type: 'uint64'
  }
];
describe('uint', () => {
  describe('decode', () => {
    for (const fixture of fixtures) {
      const data = fromHex(fixture.data);
      it(`should decode ${ fixture.type }=${ fixture.expected }`, () => {
        assert.ok(decode(data) === fixture.expected, `decode ${ fixture.type } ${ decode(data) } != ${ fixture.expected }`);
        if (fixture.strict === false) {
          assert.throws(() => decode(data, { strict: true }), Error, 'CBOR decode error: integer encoded in more bytes than necessary (strict decode)');
        } else {
          assert.ok(decode(data, { strict: true }) === fixture.expected, `decode ${ fixture.type }`);
        }
      });
    }
  });
  it('should throw error', () => {
    assert.throws(() => decode(fromHex('1ca5f702b3a5f702b3')), Error, 'CBOR decode error: encountered invalid minor (28) for major 0');
    assert.throws(() => decode(fromHex('1ba5f702b3a5f702')), Error, 'CBOR decode error: not enough data for type');
  });
  describe('encode', () => {
    for (const fixture of fixtures) {
      it(`should encode ${ fixture.type }=${ fixture.expected }`, () => {
        if (fixture.strict === false) {
          assert.notStrictEqual(toHex(encode(fixture.expected)), fixture.data, `encode ${ fixture.type } !strict`);
        } else {
          assert.strictEqual(toHex(encode(fixture.expected)), fixture.data, `encode ${ fixture.type }`);
        }
      });
    }
  });
  describe('roundtrip', () => {
    for (const fixture of fixtures) {
      if (fixture.strict !== false) {
        it(`should roundtrip ${ fixture.type }=${ fixture.expected }`, () => {
          assert.ok(decode(encode(fixture.expected)) === fixture.expected, `roundtrip ${ fixture.type }`);
        });
      }
    }
  });
  describe('toobig', () => {
    it('bigger than 64-bit', () => {
      assert.doesNotThrow(() => encode(BigInt('18446744073709551615')));
      assert.throws(() => encode(BigInt('18446744073709551616')), /BigInt larger than allowable range/);
    });
    it('disallow BigInt', () => {
      for (const fixture of fixtures) {
        const data = fromHex(fixture.data);
        if (!Number.isSafeInteger(fixture.expected)) {
          assert.throws(() => decode(data, { allowBigInt: false }), /safe integer range/);
        } else {
          assert.ok(decode(data, { allowBigInt: false }) === fixture.expected, `decode ${ fixture.type }`);
        }
      }
    });
  });
  describe('toosmall', () => {
    for (const fixture of fixtures) {
      if (fixture.strict !== false && typeof fixture.expected === 'number') {
        const small = BigInt(fixture.expected);
        it(`should encode ${ small }n`, () => {
          assert.strictEqual(toHex(encode(BigInt(small))), fixture.data, `encode ${ small }`);
        });
      }
    }
  });
});