package server

import (
	"log/slog"
	"net/http"
	"time"
)

// Logging returns a middleware that logs each request's method, path,
// status code, duration, and request ID using the provided structured logger.
func Logging(logger *slog.Logger) Middleware {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			start := time.Now()

			sw := &statusWriter{ResponseWriter: w, status: http.StatusOK}
			next.ServeHTTP(sw, r)

			duration := time.Since(start)
			attrs := []slog.Attr{
				slog.String("method", r.Method),
				slog.String("path", r.URL.Path),
				slog.Int("status", sw.status),
				slog.Duration("duration", duration),
			}

			if id := RequestIDFromContext(r.Context()); id != "" {
				attrs = append(attrs, slog.String("request_id", id))
			}

			level := slog.LevelInfo
			if sw.status >= http.StatusInternalServerError {
				level = slog.LevelError
			}

			logger.LogAttrs(r.Context(), level, "request completed", attrs...)
		})
	}
}