package data

import (
	"context"
	"database/sql"
	"time"
)

// FetchActualHourlyRain sums rs485_weather_10min.rain_10m_mm_x1000 over [start,end) and returns mm.
func FetchActualHourlyRain(ctx context.Context, stationID string, start, end time.Time) (float64, bool, error) {
	const q = `SELECT SUM(rain_10m_mm_x1000) FROM rs485_weather_10min WHERE station_id=$1 AND bucket_start >= $2 AND bucket_start < $3`
	var sum sql.NullInt64
	err := DB().QueryRowContext(ctx, q, stationID, start, end).Scan(&sum)
	if err != nil {
		return 0, false, err
	}
	if !sum.Valid {
		return 0, false, nil
	}
	return float64(sum.Int64) / 1000.0, true, nil
}