/* eslint-env mocha */

import chai from 'chai'

import { decode, encode } from '../cborg.js'
import { useBuffer, fromHex, toHex } from '../lib/byte-utils.js'

const { assert } = chai

// some from https://github.com/PJK/libcbor

const fixtures = [
  { data: '40', expected: '', type: 'bytes' },
  { data: '41a1', expected: 'a1', type: 'bytes' },
  { data: '5801a1', expected: 'a1', type: 'bytes', strict: false },
  {
    data: '58ff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    expected: '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    type: 'bytes',
    label: 'long bytes, 8-bit length'
  },
  {
    data: '5900ff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    expected: '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    type: 'bytes',
    label: 'long bytes, 16-bit length',
    strict: false
  },
  {
    data: '5a000000ff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    expected: '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    type: 'bytes',
    label: 'long bytes, 32-bit length',
    strict: false
  },
  {
    data: '5b00000000000000ff000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    expected: '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfe',
    type: 'bytes',
    label: 'long bytes, 64-bit length',
    strict: false
  }
]

// fill up byte arrays we can validate in strict mode, the minimal size for each
// excluding 64-bit because 4G is just too big
;(() => {
  function rnd (length) {
    return new Uint8Array(Array.from({ length }, () => Math.floor(Math.random() * 255)))
  }

  const expected16 = rnd(256)
  fixtures.push({
    data: new Uint8Array([...fromHex('590100'), ...expected16]),
    expected: expected16,
    type: 'bytes',
    label: 'long bytes, 16-bit length strict-compat'
  })

  const expected32 = rnd(65536)
  fixtures.push({
    data: new Uint8Array([...fromHex('5a00010000'), ...expected32]),
    expected: expected32,
    type: 'bytes',
    label: 'long bytes, 32-bit length strict-compat'
  })
})()

describe('bytes', () => {
  describe('decode', () => {
    for (const fixture of fixtures) {
      const data = fromHex(fixture.data)
      it(`should decode ${fixture.type}=${fixture.label || fixture.expected}`, () => {
        let actual = decode(data)
        assert.strictEqual(
          toHex(actual),
          toHex(fromHex(fixture.expected)),
          `decode ${fixture.type}`)

        if (fixture.strict === false) {
          assert.throws(() => decode(data, { strict: true }), Error, 'CBOR decode error: integer encoded in more bytes than necessary (strict decode)')
        } else {
          actual = decode(data, { strict: true })
          assert.strictEqual(
            toHex(actual),
            toHex(fromHex(fixture.expected)),
            `decode ${fixture.type} strict`)
        }
      })

      it('should fail to decode very large length', () => {
        assert.throws(
          () => decode(fromHex('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')),
          /CBOR decode error: 64-bit integer bytes lengths not supported/)
      })
    }
  })

  describe('encode', () => {
    for (const fixture of fixtures) {
      if (fixture.data.length >= 100000000) {
        it.skip(`(TODO) skipping encode of very large bytes ${fixture.type}=${fixture.label || fixture.expected}`, () => {})
        continue
      }

      const data = fromHex(fixture.expected)
      const expectedHex = toHex(fixture.data)

      it(`should encode ${fixture.type}=${fixture.label || fixture.expected}`, () => {
        if (fixture.unsafe) {
          assert.throws(() => encode(data), Error, /^CBOR encode error: number too large to encode \(-\d+\)$/)
        } else if (fixture.strict === false) {
          assert.notStrictEqual(toHex(encode(data)), expectedHex, `encode ${fixture.type} !strict`)
        } else {
          assert.strictEqual(toHex(encode(data)), expectedHex, `encode ${fixture.type}`)
        }
      })
    }
  })

  describe('typedarrays', () => {
    const cases = [
      {
        obj: Uint8Array.from([1, 2, 3]),
        hex: '43010203'
      },
      {
        obj: Uint8ClampedArray.from([1, 2, 3]),
        hex: '43010203'
      },
      {
        obj: Uint16Array.from([1, 2, 3]),
        hex: '46010002000300'
      },
      {
        obj: Uint32Array.from([1, 2, 3]),
        hex: '4c010000000200000003000000'
      },
      {
        obj: Int8Array.from([1, 2, -3]),
        hex: '430102fd'
      },
      {
        obj: Int16Array.from([1, 2, -3]),
        hex: '4601000200fdff'
      },
      {
        obj: Int32Array.from([1, 2, -3]),
        hex: '4c0100000002000000fdffffff'
      },
      {
        obj: Float32Array.from([1, 2, -3]),
        hex: '4c0000803f00000040000040c0'
      },
      {
        obj: Float64Array.from([1, 2, -3]),
        hex: '5818000000000000f03f000000000000004000000000000008c0'
      },
      {
        obj: BigUint64Array.from([BigInt(1), BigInt(2), BigInt(3)]),
        hex: '5818010000000000000002000000000000000300000000000000'
      },
      {
        obj: BigInt64Array.from([BigInt(1), BigInt(2), BigInt(-3)]),
        hex: '581801000000000000000200000000000000fdffffffffffffff'
      },
      {
        obj: new DataView(Uint8Array.from([1, 2, 3]).buffer),
        hex: '43010203'
      },
      {
        obj: Uint8Array.from([1, 2, 3]).buffer,
        hex: '43010203'
      }
    ]

    for (const testCase of cases) {
      it(testCase.obj.constructor.name, () => {
        assert.equal(toHex(encode(testCase.obj)), testCase.hex)
        const decoded = decode(fromHex(testCase.hex))
        assert.instanceOf(decoded, Uint8Array)
        assert.equal(toHex(decoded), toHex(testCase.obj))
      })
    }
  })

  if (useBuffer) {
    describe('buffer', () => {
      it('can encode Node.js Buffers', () => {
        const obj = global.Buffer.from([1, 2, 3])
        assert.equal(toHex(encode(obj)), '43010203')
        const decoded = decode(fromHex('43010203'))
        assert.instanceOf(decoded, Uint8Array)
        assert.equal(toHex(decoded), toHex(obj))
      })
    })
  }
})