import { describe, test, expect } from 'vitest'
import { expectDataViewEqual, filledDataView, sizedDataView } from '.'
import { isHeadless, parse, serialize, sizeof, sizeofHead } from '../src'

describe('serialize', () => {
  test('Boolean', () => {
    const expected = filledDataView([0x01])
    let actual = sizedDataView(0)
    expect(() => serialize(actual, true, Boolean)).toThrow()

    actual = sizedDataView(1)

    serialize(actual, true, Boolean)
    expectDataViewEqual(actual, expected)
  })
  test('Number', () => {
    const expected = filledDataView([0x40, 0x97, 0xF2, 0x80, 0x00, 0x00, 0x00, 0x00])
    let dv = sizedDataView(7)
    expect(() => serialize(dv, 0, Number)).toThrow()
    
    dv = sizedDataView(sizeof(Number))
    expect(8).toEqual(dv.byteLength)
    
    serialize(dv, 1532.625, Number)
    expectDataViewEqual(dv, expected)
  })
  test('String', () => {
    const expected = filledDataView([
      0x00, 0x00, 0x00, 0x05,
      0x68, 0x65, 0x6C, 0x6C, 0x6F,
    ])
    let dv = sizedDataView(8)
    expect(() => serialize(dv, 'hello', String)).toThrow()

    dv = sizedDataView(sizeof('hello', String))
    expect(9).toEqual(dv.byteLength)

    serialize(dv, 'hello', String)
    expectDataViewEqual(dv, expected)
  })
  test('Array, Number', () => {
    const expected = filledDataView([
      0x00, 0x00, 0x00, 0x02,
      0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    ])
    let dv = sizedDataView(19)
    expect(() => serialize(dv, [1, 2], Array, Number)).toThrow()
    
    dv = sizedDataView(sizeof([1, 2], Array, Number))
    expect(20).toEqual(dv.byteLength)

    serialize(dv, [1, 2], Array, Number)
    expectDataViewEqual(dv, expected)
  })
  test('Array, String', () => {
    const expected = filledDataView([
      0x00, 0x00, 0x00, 0x02,
      0x00, 0x00, 0x00, 0x0C,
      0x00, 0x00, 0x00, 0x15,
      // hello
      0x00, 0x00, 0x00, 0x05,
      0x68, 0x65, 0x6C, 0x6C, 0x6F,
      // sek1ro
      0x00, 0x00, 0x00, 0x06,
      0x73, 0x65, 0x6b, 0x31, 0x72, 0x6f,
    ])
    const array = ['hello', 'sek1ro']
    const actual = sizedDataView(sizeof(array, Array, String))

    serialize(actual, array, Array, String)
    expectDataViewEqual(actual, expected)
  })
  test('DataView', () => {
    const expected = filledDataView([
      0x00, 0x00, 0x00, 0x04,
      0x00, 0x01, 0x02, 0x03,
    ])
    const dv = filledDataView([
      0x00, 0x01, 0x02, 0x03,
    ])
    let actual = sizedDataView(7)
    expect(() => serialize(actual, dv, DataView)).toThrow()

    actual = sizedDataView(8)
    serialize(actual, dv, DataView)
    expectDataViewEqual(actual, expected)
  })
})

describe('parse', () => {
  test('Boolean', () => {
    expect(parse(filledDataView([0x00]), Boolean)).toBeFalsy()
    expect(parse(filledDataView([0x01]), Boolean)).toBeTruthy()
  })
  test('Number', () => {
    const expected = 1532.625
    const dv = filledDataView([0x40, 0x97, 0xF2, 0x80, 0x00, 0x00, 0x00, 0x00])
    const actual = parse(dv, Number)
    expect(actual).toEqual(expected)
  })
  test('String', () => {
    const expected = 'hello'
    const dv = filledDataView([
      0x00, 0x00, 0x00, 0x05,
      0x68, 0x65, 0x6C, 0x6C, 0x6F
    ])
    const actual = parse(dv, String)
    expect(actual).toEqual(expected)
  })
  test('Array, Number', () => {
    const expected = [1, 2]
    const dv = filledDataView([
      0x00, 0x00, 0x00, 0x02,
      0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    ])
    const actual = parse(dv, Array, Number)
    expect(actual).toEqual(expected)
  })
  test('Array, String', () => {
    const expected = ['hello', 'sek1ro']
    const dv = filledDataView([
      0x00, 0x00, 0x00, 0x02,
      0x00, 0x00, 0x00, 0x0C,
      0x00, 0x00, 0x00, 0x15,
      // hello
      0x00, 0x00, 0x00, 0x05,
      0x68, 0x65, 0x6C, 0x6C, 0x6F,
      // sek1ro
      0x00, 0x00, 0x00, 0x06,
      0x73, 0x65, 0x6b, 0x31, 0x72, 0x6f,
    ])
    const actual = parse(dv, Array, String)
    expect(actual).toEqual(expected)
  })
  test('DataView', () => {
    const expected = filledDataView([
      0x00, 0x01, 0x02, 0x03,
    ])
    const dv = filledDataView([
      0x00, 0x00, 0x00, 0x04,
      0x00, 0x01, 0x02, 0x03,
    ])
    const actual = parse(dv, DataView)
    expectDataViewEqual(actual, expected)
  })
})

describe('isHeadless', () => {
  test('Array', () => {
    expect(isHeadless(Array, Number)).toBeTruthy()
    expect(isHeadless(Array, String)).toBeTruthy()
  })
})

describe('sizeofHead', () => {
  test('Boolean', () => {
    expect(sizeofHead(Boolean)).toEqual(1)
  })
  test('Number', () => {
    expect(sizeofHead(Number)).toEqual(8)
  })
  test('String', () => {
    expect(sizeofHead(String)).toEqual(4)
  })
  test('Array', () => {
    expect(sizeofHead(Array, Number)).toEqual(4)
  })
  test('DataView', () => {
    expect(sizeofHead(DataView)).toEqual(4)
  })
})

describe('sizeof', () => {
  test('unknown', () => {
    expect(() => sizeof(String)).toThrow()
    expect(() => sizeof(Array, Number)).toThrow()
    expect(() => sizeof(DataView)).toThrow()
  })
})