// ============================================
// services/tomtom.go - SERVICE TOMTOM ROUTING
// ============================================

package services

import (
	"encoding/json"
	"fmt"
	"gestion/models"
	"io"
	"log"
	"net/http"
	"os"
	"time"
)

func GetETAWithTraffic(from, to Coordinates) (etaMinutes int, distanceKm float64, err error) {
	apiKey := os.Getenv("TOMTOM_API_KEY")
	if apiKey == "" {
		return 0, 0, fmt.Errorf("TOMTOM_API_KEY non configurée")
	}

	// API TomTom Routing: Calculate Route avec trafic
	url := fmt.Sprintf(
		"https://api.tomtom.com/routing/1/calculateRoute/%f,%f:%f,%f/json?key=%s&traffic=true&travelMode=car",
		from.Latitude, from.Longitude, to.Latitude, to.Longitude, apiKey,
	)

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Get(url)
	if err != nil {
		return 0, 0, fmt.Errorf("erreur requête TomTom: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return 0, 0, fmt.Errorf("erreur API TomTom %d: %s", resp.StatusCode, string(body))
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return 0, 0, fmt.Errorf("erreur lecture: %w", err)
	}

	var routeResponse models.RouteResponse
	if err := json.Unmarshal(body, &routeResponse); err != nil {
		return 0, 0, fmt.Errorf("erreur parsing: %w", err)
	}

	if len(routeResponse.Routes) == 0 {
		return 0, 0, fmt.Errorf("aucun itinéraire trouvé")
	}

	summary := routeResponse.Routes[0].Summary

	// Calculer ETA en minutes (arrondi supérieur)
	etaMinutes = (summary.TravelTimeInSeconds + 59) / 60
	distanceKm = float64(summary.LengthInMeters) / 1000.0

	log.Printf("🛣️ TomTom Routing: %.2f km → %d min (trafic inclus)", distanceKm, etaMinutes)

	return etaMinutes, distanceKm, nil
}