import { NextResponse } from "next/server";

export interface SunTimes {
  date: string;
  sunrise: string;
  sunset: string;
}

// Calcul approximatif du lever/coucher du soleil pour Fakarava
// Coordonnées de Fakarava (Rotoava) : -16.3167, -145.6167
// En production, utiliser une API comme https://sunrise-sunset.org/api
const calculateSunTimes = (date: Date, lat: number = -16.3167, lng: number = -145.6167): SunTimes => {
  // Calcul simplifié (formule approximative)
  const dayOfYear = Math.floor((date.getTime() - new Date(date.getFullYear(), 0, 0).getTime()) / 86400000);
  const declination = 23.45 * Math.sin((360 * (284 + dayOfYear) / 365) * Math.PI / 180);
  const hourAngle = Math.acos(-Math.tan(lat * Math.PI / 180) * Math.tan(declination * Math.PI / 180)) * 180 / Math.PI;
  
  const sunriseHour = 12 - hourAngle / 15 - (lng / 15);
  const sunsetHour = 12 + hourAngle / 15 - (lng / 15);
  
  const formatTime = (hour: number) => {
    const h = Math.floor(hour);
    const m = Math.floor((hour - h) * 60);
    return `${h.toString().padStart(2, "0")}:${m.toString().padStart(2, "0")}`;
  };
  
  return {
    date: date.toISOString().split("T")[0],
    sunrise: formatTime(sunriseHour),
    sunset: formatTime(sunsetHour),
  };
};

export async function GET() {
  const today = new Date();
  const sunTimes = calculateSunTimes(today);
  
  return NextResponse.json(sunTimes);
}