package middleware

import (
	"strconv"
	"time"

	"a301_server/pkg/metrics"

	"github.com/gofiber/fiber/v2"
)

// Metrics records HTTP request count and duration as Prometheus metrics.
func Metrics(c *fiber.Ctx) error {
	start := time.Now()
	err := c.Next()
	duration := time.Since(start).Seconds()

	status := strconv.Itoa(c.Response().StatusCode())
	path := c.Route().Path // use route pattern to avoid cardinality explosion
	method := c.Method()

	metrics.HTTPRequestsTotal.WithLabelValues(method, path, status).Inc()
	metrics.HTTPRequestDuration.WithLabelValues(method, path).Observe(duration)
	return err
}