package catalog

import (
	"testing"
	"time"
)

func TestAScheduleWindowHolds(t *testing.T) {
	ist := time.FixedZone("TRT", 3*3600)
	at := func(day, hm string) time.Time {
		d, _ := time.ParseInLocation("2006-01-02 15:04", day+" "+hm, ist)
		return d
	}
	// 2026-10-05 is a Monday.
	work := Scaling{Schedule: []ScaleWindow{{Days: []string{"weekdays"}, From: "08:00", To: "18:00", Min: 2}},
		Prewarm: 30 * time.Minute}
	night := Scaling{Schedule: []ScaleWindow{{From: "22:00", To: "02:00", Min: 1}}}
	for _, c := range []struct {
		s    Scaling
		t    time.Time
		want bool
	}{
		{work, at("2026-10-05", "09:00"), true},
		{work, at("2026-10-05", "07:40"), true}, // prewarm
		{work, at("2026-10-05", "07:20"), false},
		{work, at("2026-10-05", "18:00"), false},
		{work, at("2026-10-04", "10:00"), false}, // Sunday
		{work, at("2026-10-04", "23:50"), false},
		{night, at("2026-10-05", "23:00"), true},
		{night, at("2026-10-06", "01:30"), true}, // after midnight, from yesterday's start
		{night, at("2026-10-06", "02:00"), false},
		{night, at("2026-10-06", "12:00"), false},
	} {
		if _, got := c.s.Window(c.t); got != c.want {
			t.Errorf("%v at %s: %v, want %v", c.s.Schedule[0], c.t.Format("Mon 15:04"), got, c.want)
		}
	}
	// Opened the evening before by its lead.
	early := Scaling{Schedule: []ScaleWindow{{Days: []string{"tue"}, From: "00:15", To: "06:00", Min: 1}}, Prewarm: time.Hour}
	if _, ok := early.Window(at("2026-10-05", "23:30")); !ok {
		t.Error("a window after midnight was not prewarmed the evening before")
	}
	for _, bad := range []ScaleWindow{{From: "8:00", To: "18:00"}, {From: "08:00", To: "08:00"},
		{From: "08:00", To: "18:00", Days: []string{"monday"}}, {From: "08:00", To: "18:00", Min: 3, Max: 2}} {
		if bad.validate() == nil {
			t.Errorf("%+v accepted", bad)
		}
	}
}