package bookings

import (
	"log"
	"net/http"

	"crussell/db"
	"crussell/mw"
)

// CancelReservationHandler releases the authenticated user's active reservation
// by deleting their RESERVATION:user entries from time_blockers.
// It does NOT create a booking — it only releases the temporary slot hold.
//
// DELETE /api/bookings/reserve
func CancelReservationHandler(w http.ResponseWriter, r *http.Request) {
	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		log.Printf("CancelReservationHandler: user ID not found in context")
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	_, err := db.Conn.Exec(r.Context(), `
		DELETE FROM time_blockers
		WHERE created_by = $1 AND description LIKE 'RESERVATION:user:%'
	`, userID)
	if err != nil {
		log.Printf("CancelReservationHandler: failed to delete reservation for user %s: %v", userID, err)
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}

	mw.RespondJSON(w, http.StatusOK, map[string]string{"status": "reservation cancelled"})
}