package changes

import (
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
)

func TestCompareThreeDayDetectsDayChanges(t *testing.T) {
	previousTemp := 70.0
	currentTemp := 78.0
	previousPrecip := 20.0
	currentPrecip := 70.0
	previous := briefing.Package{
		Metadata: briefing.Metadata{ReportID: report.ThreeDay},
		ThreeDay: &briefing.ThreeDay{Days: []briefing.OutlookDay{{
			Date:        "2026-05-29",
			Temperature: forecast.Range{Max: &previousTemp},
			MaxPrecipitationProbability: &forecast.TimedValue{
				Value: previousPrecip,
				Time:  time.Date(2026, 5, 29, 9, 0, 0, 0, time.UTC),
			},
		}}},
	}
	current := briefing.Package{
		Metadata: briefing.Metadata{ReportID: report.ThreeDay},
		ThreeDay: &briefing.ThreeDay{Days: []briefing.OutlookDay{{
			Date:        "2026-05-29",
			Temperature: forecast.Range{Max: &currentTemp},
			MaxPrecipitationProbability: &forecast.TimedValue{
				Value: currentPrecip,
				Time:  time.Date(2026, 5, 29, 12, 0, 0, 0, time.UTC),
			},
			Dayparts: []forecast.DaypartSummary{{Indicators: forecast.Indicators{Snow: true}}},
		}}},
	}

	changes, err := CompareThreeDay(previous, current, Thresholds{
		TemperatureDegrees:       5,
		PrecipProbabilityPoints:  20,
		PrecipTimingShiftMinutes: 120,
	})
	if err != nil {
		t.Fatalf("CompareThreeDay() error = %v", err)
	}

	if len(changes) == 0 {
		t.Fatal("changes length = 0, want detected 3-day changes")
	}
	var foundPrecip bool
	var foundSnow bool
	for _, change := range changes {
		if change.Type == "outlook_precip_probability_change" {
			foundPrecip = true
		}
		if change.Type == "outlook_snow_risk_change" {
			foundSnow = true
		}
	}
	if !foundPrecip || !foundSnow {
		t.Fatalf("changes = %#v, want precipitation and snow changes", changes)
	}
}