/* eslint-env mocha,es2020 */

import { assert } from 'chai'
import { decode, encode } from 'cborg/json'

const toBytes = (str) => new TextEncoder().encode(str)

function verifyRoundTrip (obj, sorting) {
  const encoded = new TextDecoder().decode(encode(obj, sorting === false ? { mapSorter: null } : undefined))
  const json = JSON.stringify(obj)
  assert.strictEqual(encoded, json)
  const decoded = decode(toBytes(JSON.stringify(obj)))
  assert.deepStrictEqual(decoded, obj)
}

function verifyEncodedForm (testCase) {
  // round trip the original object
  const obj = JSON.parse(testCase)
  const encoded = encode(obj)
  assert.strictEqual(new TextDecoder().decode(encoded), JSON.stringify(obj))
  const decoded = decode(encoded)
  assert.deepStrictEqual(decoded, obj)
  // now look at the original form
  const decoded2 = decode(toBytes(testCase))
  assert.deepStrictEqual(decoded2, obj)
}

describe('json basics', () => {
  it('can round-trip basic literals', () => {
    const testCases = [
      'null',
      'true',
      'false',
      '0',
      '9007199254740991',
      '-9007199254740991',
      JSON.stringify(Number.MAX_VALUE),
      JSON.stringify(Number.MIN_VALUE)
    ]

    for (const testCase of testCases) {
      verifyEncodedForm(testCase)
    }
    assert.strictEqual(decode(toBytes('1E1')), 10)
    assert.strictEqual(decode(toBytes('0.1e1')), 1)
    assert.strictEqual(decode(toBytes('1e-1')), 0.1)
    assert.strictEqual(decode(toBytes('1e+00')), 1)
    assert.strictEqual(decode(toBytes('10.0')), 10)
    assert.deepStrictEqual(decode(toBytes('[-10.0,1.0,0.0,100.0]')), [-10, 1, 0, 100])
    verifyRoundTrip(true)
    verifyRoundTrip(false)
    verifyRoundTrip(null)
    verifyRoundTrip(100)
    verifyRoundTrip(-100)
    verifyRoundTrip(1.11)
    verifyRoundTrip(-100.11111)
    verifyRoundTrip(1.11e10)
    verifyRoundTrip(1.0011111e-18)
  })

  it('handles large integers as BigInt', () => {
    const verify = (inp, str) => {
      if (str === undefined) {
        str = String(inp)
      }
      assert.strictEqual(decode(toBytes(str), { allowBigInt: true }), inp)
      assert.strictEqual(decode(toBytes(str)), parseFloat(str)) // no BigInt for you
    }
    verify(Number.MAX_SAFE_INTEGER)
    verify(-Number.MAX_SAFE_INTEGER)
    verify(BigInt('9007199254740992')) // Number.MAX_SAFE_INTEGER+1
    verify(BigInt('9007199254740993'))
    verify(BigInt('11959030306112471731'))
    verify(BigInt('18446744073709551615')) // max uint64
    verify(BigInt('9223372036854775807')) // max int64
    verify(BigInt('-9007199254740992'))
    verify(BigInt('-9007199254740993'))
    verify(BigInt('-9223372036854776000')) // min int64
    verify(BigInt('-11959030306112471732'))
    verify(BigInt('-18446744073709551616')) // min -uint64

    // these are "floats", distinct from "ints" which wouldn't have the `.` in them
    verify(-9007199254740992, '-9007199254740992.0')
    verify(-9223372036854776000, '-9223372036854776000.0')
    verify(-18446744073709551616, '-18446744073709551616.0')
  })

  it('can round-trip string literals', () => {
    const testCases = [
      JSON.stringify(''),
      JSON.stringify(' '),
      JSON.stringify('"'),
      JSON.stringify('\\'),
      JSON.stringify('\b\f\n\r\t'),
      JSON.stringify('\u0022'),
      JSON.stringify('" %22 0x22 034 "'),
      '"😀"'
    ]

    for (const testCase of testCases) {
      verifyEncodedForm(testCase)
    }
    assert.strictEqual(decode(toBytes('"/ & \\/"')), '/ & /')
    verifyRoundTrip('this is a string')
    verifyRoundTrip('this 𝄞 is a ☺☺ ♣ string ̐ ̀\n\r') // accents like  ̀ and  ̐ use two-byte utf8
    verifyRoundTrip('')
    verifyRoundTrip('foo\\bar\nbaz\tbop\rbing"bip\'bang')
  })

  it('can round-trip array literals', () => {
    const testCases = [
      '[]',
      '[null]',
      '[true, false]',
      '[ \n 0,1, 2\n ,  3,\n4] \n ',
      '[-10.0, 1.0, 0.0, 100.0]',
      '[["2 deep"]]'
    ]
    for (const testCase of testCases) {
      verifyEncodedForm(testCase)
    }
    verifyRoundTrip([1, 2, 3, 'string', true, 4])
    verifyRoundTrip([1, 2, 3, 'string', true, ['and', 'a', 'nested', 'array', true], 4])
  })

  it('can round-trip object literals', () => {
    const testCases = [
      '{}',
      '\n {\n "\\b"\n :\n""\n }\n ',
      '{"":""}',
      '{"1":{"2":0,"3":"deep"}}'
    ]
    for (const testCase of testCases) {
      verifyEncodedForm(testCase)
    }
  })

  it('will sort map keys', () => {
    const unsorted = { one: 1, two: 2, three: 3.1, str: 'string', bool: true, four: 4 }
    verifyRoundTrip(unsorted, false)
    assert.strictEqual(
      new TextDecoder().decode(encode(unsorted)),
      '{"bool":true,"four":4,"one":1,"str":"string","three":3.1,"two":2}')
  })

  it('can handle novel cases', () => {
    assert.strictEqual(decode(toBytes('"this \\uD834\\uDD1E is a \\u263a\\u263a string"')), 'this 𝄞 is a ☺☺ string')
    verifyRoundTrip({ one: 1, two: 2, three: 3.1, str: 'string', arr: ['and', 'a', 'nested', [], 'array', [true, 1], false], bool: true, obj: { nested: 'object', a: [], o: {} }, four: 4 }, false)
    verifyRoundTrip([false, [{ '#nFzU': {}, '\\w>': -0.9441451951197325, "\t'": "'JB+2Wg\tw\"IrM*#e^L/d&4rrzUuwq(1mH6aVRredB&Bfs]S\"KqK(Tz1Q\"URBAfw", '\n@FrfM': 'M[D]q&' }, "J4>'Xdc+u2$%", 4227406737130333]], false)
    verifyRoundTrip([0.12995619865708727, -4973404279772543, { drG2: [true], ';#K^Qf>V': null, '`2=': 'ecc<e/$+-.;U>Gr5RdZDJ\n5+:{=QHNN.tVVN~dX$FWFwu`6>"&=tW!*1*^☺)JFM1p|}&X.B|${*\\f@!w2☺+' }], false)
    assert.strictEqual(`${decode(encode(9007199254740991))}`, '9007199254740991')
    assert.strictEqual(`${decode(encode(9007199254740992))}`, '9007199254740992')
    assert.strictEqual(`${decode(encode(900719925474099100n))}`, '900719925474099100')
  })

  it('should throw on bad types', () => {
    assert.throws(() => encode(new Uint8Array([1, 2])), /CBOR encode error: unsupported type: Uint8Array/)
    assert.throws(() => encode({ boop: new Uint8Array([1, 2]) }), /CBOR encode error: unsupported type: Uint8Array/)
    assert.throws(() => encode(undefined), /CBOR encode error: unsupported type: undefined/)
    assert.throws(() => encode(new Map([[1, 2], [2, 3]])), /CBOR encode error: non-string map keys are not supported/)
    assert.throws(() => encode(new Map([[['foo', 'bar'], 2], [['bar', 'foo'], 3]])), /CBOR encode error: complex map keys are not supported/)
  })

  it('should throw on bad decode failure modes', () => {
    assert.throws(() => decode(toBytes('{"a":1 & "b":2}')), 'CBOR decode error: unexpected character at position 7, was expecting object delimiter but found \'&\'')
    assert.throws(() => decode(toBytes('{"a":1,"b"!2}')), 'CBOR decode error: unexpected character at position 10, was expecting key/value delimiter \':\' but found \'!\'')
    assert.throws(() => decode(toBytes('[1,2&3]')), 'CBOR decode error: unexpected character at position 4, was expecting array delimiter but found \'&\'')
    assert.throws(() => decode(toBytes('{"a":!}')), 'CBOR decode error: unexpected character at position 5')
    assert.throws(() => decode(toBytes('"abc')), 'CBOR decode error: unexpected end of string at position 4')
    assert.throws(() => decode(toBytes('"ab\\xc"')), 'CBOR decode error: unexpected string escape character at position 5')
    assert.throws(() => decode(toBytes('"ab\x1Ec"')), 'CBOR decode error: invalid control character at position 3')
    assert.throws(() => decode(toBytes('"ab\\')), 'CBOR decode error: unexpected string termination at position 4')
    // begining of a quoted string with 3-byte unicode sequence with the last one truncated
    assert.throws(() => decode(toBytes('"☺').subarray(0, 3)), 'CBOR decode error: unexpected unicode sequence at position 1')
    assert.throws(() => decode(toBytes('"\\uxyza"')), 'CBOR decode error: unexpected unicode escape character at position 3')
    assert.throws(() => decode(toBytes('"\\u11"')), 'CBOR decode error: unexpected end of unicode escape sequence at position 3')
    assert.throws(() => decode(toBytes('-boop')), 'CBOR decode error: unexpected token at position 1')
    assert.throws(() => decode(toBytes('{"v":nope}')), 'CBOR decode error: unexpected token at position 7, expected to find \'null\'')
    assert.throws(() => decode(toBytes('[n]')), 'CBOR decode error: unexpected end of input at position 1')
    assert.throws(() => decode(toBytes('{"v":truu}')), 'CBOR decode error: unexpected token at position 9, expected to find \'true\'')
    assert.throws(() => decode(toBytes('[tr]')), 'CBOR decode error: unexpected end of input at position 1')
    assert.throws(() => decode(toBytes('{"v":flase}')), 'CBOR decode error: unexpected token at position 7, expected to find \'false\'')
    assert.throws(() => decode(toBytes('[fa]')), 'CBOR decode error: unexpected end of input at position 1')
    assert.throws(() => decode(toBytes('-0..1')), 'CBOR decode error: unexpected token at position 3')
  })

  it('should throw when rejectDuplicateMapKeys enabled on duplicate keys', () => {
    assert.deepStrictEqual(decode(toBytes('{"foo":1,"foo":2}')), { foo: 2 })
    assert.throws(() => decode(toBytes('{"foo":1,"foo":2}'), { rejectDuplicateMapKeys: true }), /CBOR decode error: found repeat map key "foo"/)
  })
})