import { describe, expect, test } from "vitest";
import { parse, serialize, sizeof, Struct } from "../src";
import { expectDataViewEqual, filledDataView, sizedDataView } from ".";

describe(Struct.name, () => {
  
  const User = Struct({ age: Number, name: String })
  const user = { age: 1, name: 'hello' }
  const user_dv = filledDataView([
    0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x0C,
    0x00, 0x00, 0x00, 0x05,
    0x68, 0x65, 0x6C, 0x6C, 0x6F,
  ])

  test('serialize, headless', () => {
    expect(() => sizeof(User)).toThrow()

    const dv = sizedDataView(sizeof(user, User))
    expect(21).toEqual(dv.byteLength)

    serialize(dv, user, User)
    expectDataViewEqual(dv, user_dv)
  })

  test('parse, headless', () => {
    expectDataViewEqual(parse(user_dv, User), user)
  })

  const Vector2 = Struct({ x: Number, y: Number })
  const vector2 = { x: 1, y: 2 }
  const vector2_dv = filledDataView([
    0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  ])

  test('serialize, non-headless', () => {
    const dv = sizedDataView(sizeof(Vector2))
    expect(16).toEqual(dv.byteLength)

    serialize(dv, vector2, Vector2)
    expectDataViewEqual(dv, vector2_dv)
  })

  test('parse, non-headless', () => {
    expectDataViewEqual(parse(vector2_dv, Vector2), vector2)
  })

  const Nested = Struct({ user: User, vector2: [Vector2] })
  const nested = { user, vector2 }
  const nested_dv = filledDataView([
    0x00, 0x00, 0x00, 0x14,
    0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x0C,
    0x00, 0x00, 0x00, 0x05,
    0x68, 0x65, 0x6C, 0x6C, 0x6F,
  ])

  test('serialize, nested', () => {
    const dv = sizedDataView(sizeof(nested, Nested))
    serialize(dv, nested, Nested)
    expectDataViewEqual(dv, nested_dv)
  })

  test('parse, nested', () => {
    expectDataViewEqual(parse(nested_dv, Nested), nested)
  })
})