package middleware

import (
	"strconv"
	"time"

	"github.com/gin-gonic/gin"

	"switchbot-api/internal/app/observability"
)

func Metrics(httpMetrics *observability.HTTPMetrics) gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		httpMetrics.InFlight.Inc()
		defer httpMetrics.InFlight.Dec()

		c.Next()

		route := c.FullPath()
		if route == "" {
			route = "/unknown"
		}
		status := strconv.Itoa(c.Writer.Status())

		httpMetrics.RequestsTotal.WithLabelValues(c.Request.Method, route, status).Inc()
		httpMetrics.RequestDuration.WithLabelValues(c.Request.Method, route, status).Observe(time.Since(start).Seconds())
	}
}