import test from 'ava'

import Decode from '../src/decode-json'
import { InvalidJson, InField, RuntimeException } from './error'

test('Decoder.decodeJSON()', t => {
  t.is(
    Decode.string.decodeJSON('"correct json string"').value,
    'correct json string'
  )

  t.deepEqual(
    Decode.string.decodeJSON('wrong json string').error,
    InvalidJson(
      new SyntaxError('Unexpected token w in JSON at position 0'),
      'wrong json string'
    )
  )

  const _0 = Decode.string.chain(msg => {
    throw new Error(msg)
  })

  t.deepEqual(
    _0.decodeJSON('"report"').error,
    RuntimeException(new Error('report'))
  )

  t.deepEqual(
    Decode.field('_0').of(_0).decodeJSON('{"_0": "err"}').error,
    InField('_0', RuntimeException(new Error('err')))
  )

  t.deepEqual(
    Decode.field('_0')
      .optional.string.chain(msg => {
        throw new Error(msg || '')
      })
      .decodeJSON('{"_0": "err"}').error,
    RuntimeException(new Error('err'))
  )

  t.deepEqual(
    Decode.field('_0')
      .of(
        Decode.optional.string.chain(msg => {
          throw new Error(msg || '')
        })
      )
      .decodeJSON('{"_0": "err"}').error,
    InField('_0', RuntimeException(new Error('err')))
  )
})