package stdio

import (
	"bufio"
	"encoding/json"
	"io"
	"strings"
	"testing"
	"time"

	"git.novox.be/novox/mesh-sdk/go/announce"
)

// A Go bundle says what it keeps from its code (novox/hq ADR 0495 clauses 1 and 2): Keeps, called before Serve,
// announces through the runtime once the bundle serves, as the module the runtime names; and a state of its own that it
// did not announce is refused at the call, naming it, so code and announcement cannot drift.
func TestABundleAnnouncesWhatItKeepsAndBindsNothingElse(t *testing.T) {
	t.Setenv(ServedAs, "chime")
	t.Setenv("MESH_MODULE", "chime")
	t.Setenv("MESH_NODE", "anchor")
	defer forgetKeeps()
	// Not yet serving: an earlier test's channel is gone with its test.
	currentMu.Lock()
	current = nil
	currentMu.Unlock()
	if err := Keeps(announce.State{Name: "rings", Readable: true}, announce.State{Name: "own"}); err != nil {
		t.Fatal(err)
	}
	if _, err := State("other").Get("k"); err == nil || !strings.Contains(err.Error(), `"other"`) {
		t.Fatalf("a state not announced was bound: %v", err)
	}
	inR, inW := io.Pipe()
	outR, outW := io.Pipe()
	go func() { _ = ServeOn("", nil, inR, outW) }()
	defer inW.Close()
	lines := bufio.NewScanner(outR)
	got := make(chan map[string]any, 1)
	go func() {
		if lines.Scan() {
			var m map[string]any
			_ = json.Unmarshal(lines.Bytes(), &m)
			got <- m
		}
	}()
	var asked map[string]any
	select {
	case asked = <-got:
	case <-time.After(3 * time.Second):
		t.Fatal("the bundle announced nothing")
	}
	p, _ := asked["params"].(map[string]any)
	if asked["method"] != "mesh/publish" || p["key"] != announce.Event {
		t.Fatalf("the announcement was not published through the runtime: %v", asked)
	}
	raw, _ := json.Marshal(p["body"])
	s, err := announce.Decode(raw)
	if err != nil || s.Module != "chime" || s.Node != "anchor" || !s.Readable("rings") || !s.Keeps("own") || s.Readable("own") {
		t.Fatalf("announced %s (%v)", raw, err)
	}
	if err := Keeps(announce.State{Name: "bad_name"}); err == nil {
		t.Fatal("an announcement no bucket could be named by was accepted")
	}
}