package middleware

import (
	"log/slog"
	"net/http"
	"runtime/debug"
)

// Recovery recovers from panics, logs the stack, and returns 500.
func Recovery(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if err := recover(); err != nil {
				slog.Error("panic recovered", "err", err, "stack", string(debug.Stack()))
				w.Header().Set("Content-Type", "application/json")
				w.WriteHeader(http.StatusInternalServerError)
				w.Write([]byte(`{"error":"internal_error","message":"internal server error"}`))
			}
		}()
		next.ServeHTTP(w, r)
	})
}