import { describe, expect, it } from 'vitest'
import type { Period } from '@/types/Period'
import { dailyAllowance, dashboardPeriod } from './dashboard'

const nov = { start_date: '2026-11-01', last_date: '2026-11-30', days: 30 }

describe('dashboard', () => {
  it('picks the open period, else the latest one', () => {
    const open = { id: 'o' } as Period
    const last = { id: 'l' } as Period
    expect(dashboardPeriod([last], open)).toBe(open)
    expect(dashboardPeriod([last, { id: 'x' } as Period], null)).toBe(last)
    expect(dashboardPeriod([], null)).toBeNull()
  })

  it('splits what is left over the remaining days', () => {
    // 12.11 dahil 19 gün; 19.000 ₺ → günde 1.000 ₺
    expect(dailyAllowance(1_900_000, nov, '2026-11-12')).toEqual({ daysLeft: 19, perDay: 100_000 })
    expect(dailyAllowance(1_000, nov, '2026-11-30')).toEqual({ daysLeft: 1, perDay: 1_000 })
    // kuruş aşağı yuvarlanır (önerilen tutar kalanı aşmasın)
    expect(dailyAllowance(1_000, nov, '2026-11-28')).toEqual({ daysLeft: 3, perDay: 333 })
  })

  it('has no daily suggestion when over budget or the period has ended', () => {
    expect(dailyAllowance(-5_000, nov, '2026-11-12').perDay).toBeNull()
    expect(dailyAllowance(0, nov, '2026-11-12').perDay).toBeNull()
    expect(dailyAllowance(5_000, nov, '2026-12-01')).toEqual({ daysLeft: 0, perDay: null })
    expect(dailyAllowance(3_000, nov, '2026-10-20')).toEqual({ daysLeft: 30, perDay: 100 })
  })
})