package main

import (
	"bufio"
	"net/http"
	"testing"
	"time"
)

// TestNestStreamSSE checks GET /api/events?nest_id= streams nest.message events
// and replays history from Last-Event-ID (the EVENTS.md nest SSE contract).
func TestNestStreamSSE(t *testing.T) {
	ts, s := newTestNestServer(t)
	id := newNest(t, ts, "Lab", `"Hugin"`)
	s.hub.OpenNest(id)
	if _, out := post(t, ts.URL+"/api/nests/"+id+"/messages", `{"author":"owner","text":"hello"}`); out["msg_id"] == nil {
		t.Fatalf("post failed: %v", out)
	}

	req, err := http.NewRequest("GET", ts.URL+"/api/events?nest_id="+id, nil)
	if err != nil {
		t.Fatal(err)
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if ct := resp.Header.Get("Content-Type"); ct != "text/event-stream" {
		t.Fatalf("content type %q", ct)
	}

	// Read in a goroutine with a deadline so a stuck stream fails, not hangs.
	got := make(chan bool, 1)
	go func() {
		sc := bufio.NewScanner(resp.Body)
		for sc.Scan() {
			if sc.Text() == "event: nest.message" {
				got <- true
				return
			}
		}
		got <- false
	}()
	select {
	case ok := <-got:
		if !ok {
			t.Fatal("stream ended before nest.message appeared")
		}
	case <-time.After(2 * time.Second):
		t.Fatal("no nest.message event within 2s")
	}
}