package mqttingest

import (
	"testing"
	"time"
)

func TestLatestDailyRainUsesConfiguredTimezone(t *testing.T) {
	loc, err := time.LoadLocation("Australia/Sydney")
	if err != nil {
		t.Fatalf("load location: %v", err)
	}

	l := NewLatest(loc)

	// Crosses UTC midnight but remains the same local day in Sydney (UTC+11 during DST).
	l.Update(time.Date(2026, time.January, 14, 22, 0, 0, 0, time.UTC), &WS90Payload{RainMM: 0})
	l.Update(time.Date(2026, time.January, 14, 23, 30, 0, 0, time.UTC), &WS90Payload{RainMM: 2})
	l.Update(time.Date(2026, time.January, 15, 0, 5, 0, 0, time.UTC), &WS90Payload{RainMM: 2})

	snap, ok := l.Snapshot()
	if !ok {
		t.Fatal("expected snapshot")
	}
	if snap.DailyRainMM != 2 {
		t.Fatalf("expected daily rain 2.0mm, got %.2fmm", snap.DailyRainMM)
	}
}

func TestLatestDailyRainResetsAtConfiguredLocalMidnight(t *testing.T) {
	loc, err := time.LoadLocation("Australia/Sydney")
	if err != nil {
		t.Fatalf("load location: %v", err)
	}

	l := NewLatest(loc)

	// Crosses local midnight in Sydney (00:00 local == 13:00 UTC during DST).
	l.Update(time.Date(2026, time.January, 15, 12, 30, 0, 0, time.UTC), &WS90Payload{RainMM: 0})
	l.Update(time.Date(2026, time.January, 15, 12, 50, 0, 0, time.UTC), &WS90Payload{RainMM: 1})
	l.Update(time.Date(2026, time.January, 15, 13, 10, 0, 0, time.UTC), &WS90Payload{RainMM: 1})

	snap, ok := l.Snapshot()
	if !ok {
		t.Fatal("expected snapshot")
	}
	if snap.DailyRainMM != 0 {
		t.Fatalf("expected daily rain reset after local midnight; got %.2fmm", snap.DailyRainMM)
	}
}