const test = require('node:test')
const assert = require('node:assert')
const { getNextOccurrence, daysBetween, startOfDay } = require('../src/occurrence')

const fmt = (d) => `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`

test('公历纪念日：今年还没到就取今年', () => {
  const anniv = { isLunar: false, solarMonth: 12, solarDay: 25 }
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2026, 7, 15))), '2026-12-25')
})

test('公历纪念日：今年已过就取明年', () => {
  const anniv = { isLunar: false, solarMonth: 5, solarDay: 20 }
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2026, 7, 15))), '2027-05-20')
})

test('农历腊月十五：跨公历年不会算错一年', () => {
  const anniv = { isLunar: true, lunarMonth: 12, lunarDay: 15, isLeapMonth: false }
  // 2027-01-20 时，下一次应是 2 天后的 2027-01-22，而不是 2028 年
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2027, 0, 20))), '2027-01-22')
  // 过了之后应跳到下一个农历年
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2027, 0, 23))), '2028-01-11')
})

test('农历四月十七', () => {
  const anniv = { isLunar: true, lunarMonth: 4, lunarDay: 17, isLeapMonth: false }
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2026, 7, 15))), '2027-05-22')
})

test('isLunar 但缺农历字段时降级按公历算，不抛错', () => {
  const anniv = { isLunar: true, lunarMonth: null, lunarDay: null, solarMonth: 6, solarDay: 5 }
  assert.strictEqual(fmt(getNextOccurrence(anniv, new Date(2026, 7, 15))), '2027-06-05')
})

test('daysBetween 忽略时分秒', () => {
  const today = new Date(2026, 7, 15, 23, 59, 0)
  const target = new Date(2026, 7, 17, 0, 1, 0)
  assert.strictEqual(daysBetween(target, today), 2)
})

test('startOfDay 归零时分秒', () => {
  const d = startOfDay(new Date(2026, 7, 15, 13, 45, 30))
  assert.strictEqual(d.getHours(), 0)
  assert.strictEqual(d.getMinutes(), 0)
})