package api

import (
	"net/http"
)

// HandleTS streams the shared channel's raw MPEG-TS bytes to a viewer.
// Every connected browser subscribes to the same upstream via the hub, so the
// server holds only one connection to the IPTV source regardless of how many
// clients are watching.
// GET /ts
func (a *App) HandleTS(w http.ResponseWriter, r *http.Request) {
	flusher, ok := w.(http.Flusher)
	if !ok {
		http.Error(w, "streaming unsupported", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "video/mp2t")
	w.Header().Set("Cache-Control", "no-cache, no-store")
	w.Header().Set("Connection", "keep-alive")
	w.WriteHeader(http.StatusOK)
	flusher.Flush()

	sub, unsub := a.Hub.Subscribe()
	defer unsub()

	ctx := r.Context()
	for {
		select {
		case <-ctx.Done():
			return
		case <-sub.Done():
			return
		case chunk, ok := <-sub.Chan():
			if !ok {
				return
			}
			if _, err := w.Write(chunk); err != nil {
				return
			}
			flusher.Flush()
		}
	}
}