package timex

import "testing"

func TestGetYearMonthToDay(t *testing.T) {
	cases := []struct {
		year, month, want int
	}{
		{2024, 2, 29}, // 闰年
		{2023, 2, 28}, // 平年
		{2000, 2, 29}, // 400 整除
		{1900, 2, 28}, // 100 整除非 400
		{2026, 1, 31},
		{2026, 4, 30},
	}
	for _, c := range cases {
		if got := GetYearMonthToDay(c.year, c.month); got != c.want {
			t.Errorf("GetYearMonthToDay(%d,%d) = %d, want %d", c.year, c.month, got, c.want)
		}
	}
}

func TestNtUtcConvert(t *testing.T) {
	nt := UtcToNt(1000000000)
	if got := NtToUtc(nt); got != 1000000000 {
		t.Errorf("NT/UTC 往返 = %d, want 1000000000", got)
	}
}

func TestTimeStrToTimestamp(t *testing.T) {
	ts, err := TimeStrToTimestamp("2026-08-29 12:00:00")
	if err != nil {
		t.Fatalf("TimeStrToTimestamp: %v", err)
	}
	if ts <= 0 {
		t.Errorf("时间戳应为正数: %d", ts)
	}
	if ts%1000 != 0 {
		t.Errorf("毫秒时间戳应为整秒: %d", ts)
	}
	if _, err := TimeStrToTimestamp("bad"); err == nil {
		t.Error("非法格式应返回错误")
	}
}