import { describe, expect, it } from 'vitest'
import { int, keys } from '@/utils/misc'

describe('int', () => {
  it('returns min when rand() is 0', () => {
    expect(int(1, 10, () => 0)).toBe(1)
    expect(int(-5, 5, () => 0)).toBe(-5)
  })

  it('returns max when rand() is just below 1', () => {
    expect(int(1, 10, () => 0.999)).toBe(10)
    expect(int(-5, 5, () => 0.999)).toBe(5)
  })

  it('returns value in range for deterministic rand', () => {
    // rand 0 -> 0/10 -> 0 + 1 = 1
    expect(int(1, 10, () => 0)).toBe(1)
    // rand 0.5 -> 5/10 -> 5 + 1 = 6
    expect(int(1, 10, () => 0.5)).toBe(6)
    // rand 0.99 -> 9.9/10 -> 9 + 1 = 10
    expect(int(1, 10, () => 0.99)).toBe(10)
  })

  it('single value range always returns that value', () => {
    expect(int(42, 42, () => 0)).toBe(42)
    expect(int(42, 42, () => 0.5)).toBe(42)
    expect(int(42, 42, () => 0.999)).toBe(42)
  })

  it('result is always in [min, max] inclusive', () => {
    const min = -3
    const max = 7
    for (let i = 0; i < 100; i++) {
      const r = int(min, max, () => i / 100)
      expect(r).toBeGreaterThanOrEqual(min)
      expect(r).toBeLessThanOrEqual(max)
      expect(Number.isInteger(r)).toBe(true)
    }
  })
})

describe('keys', () => {
  it('returns the keys of an object', () => {
    const obj = { a: 1, b: 2, c: 3 }
    expect(keys(obj)).toEqual(['a', 'b', 'c'])
  })
})