package ericMetrics

import (
	"gitee.com/tym_hmm/eric-metrics/internal/plot"
	"time"

	"github.com/gorilla/websocket"
)

var plots plot.List

// sendStats indefinitely send runtime statistics on the websocket connection.
func sendStats(conn *websocket.Conn, frequency time.Duration) error {
	tick := time.NewTicker(frequency)
	defer tick.Stop()

	// If the websocket connection is initiated by an already open web ui
	// (started by a previous process for example) then plotsdef.js won't be
	// requested. So, call plots.config manually to ensure that the data
	// structures inside 'plots' are correctly initialized.
	plots.Config()

	for range tick.C {
		w, err := conn.NextWriter(websocket.TextMessage)
		if err != nil {
			return err
		}
		if err := plots.WriteValues(w); err != nil {
			return err
		}
		if err := w.Close(); err != nil {
			return err
		}
	}

	panic("unreachable")
}