//go:build integration

package views_test

import (
	"context"
	"encoding/json"
	"testing"
	"time"

	"github.com/nats-io/nats.go"
	"github.com/nats-io/nats.go/jetstream"

	"git.novox.be/novox/mesh-sdk/go/process"
	"git.novox.be/novox/mesh-sdk/go/testbus"
	"git.novox.be/novox/mesh-sdk/go/views"
	"git.novox.be/novox/mesh-sdk/go/views/viewstest"
)

// An owner's change is an ordinary event on the shared events stream (novox/hq ADR 0635 §5): a reader that follows the
// owner's state by its read tool hears it on the module's durable consumer of that stream, with no stream of the owner's,
// and a message that is no views event goes to Other.
func TestAReaderHearsAnOwnersChangesAsOrdinaryEvents(t *testing.T) {
	nc, err := nats.Connect(testbus.URL(t))
	if err != nil {
		t.Fatal(err)
	}
	defer nc.Close()
	js, err := jetstream.New(nc)
	if err != nil {
		t.Fatal(err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	cred := process.Account{Node: "n1", Module: "reader"}
	kv := viewstest.Serve(t, ctx, js, nc, "o", "modules", "o.o_read_modules", cred.EventConsumerName())
	if _, err := kv.Put(ctx, "a", []byte(`{"n":1}`)); err != nil {
		t.Fatal(err)
	}
	other := make(chan string, 1)
	r := &views.ProcessReader{Module: "reader", Other: func(m jetstream.Msg) { other <- m.Subject(); _ = m.Ack() }, Logf: t.Logf,
		Call: func(tool string, body any) (json.RawMessage, error) {
			raw, _ := json.Marshal(body)
			m, err := nc.Request("mesh.mod.o.call.o_read_modules.n0", raw, 5*time.Second)
			if err != nil {
				return nil, err
			}
			return m.Data, nil
		}}
	if _, err := r.Follow("o", "modules", "o.o_read_modules"); err != nil {
		t.Fatal(err)
	}
	r.Start(ctx, js, cred, nil)
	<-r.Ready()
	pic, err := r.KeyValue(ctx, "o_modules")
	if err != nil {
		t.Fatal(err)
	}
	w, err := pic.Watch(ctx, "b")
	if err != nil {
		t.Fatal(err)
	}
	if _, err := kv.Put(ctx, "b", []byte(`{"n":2}`)); err != nil {
		t.Fatal(err)
	}
	for e := range w.Updates() {
		if e != nil && e.Key() == "b" {
			break
		}
	}
	if s := r.Followers()[0].Status(); s.Asks != 1 || s.Keys != 2 {
		t.Fatalf("the change was not heard as an event alone: %+v", s)
	}
	if _, err := js.Publish(ctx, "mesh.mod.o.event.something-else", []byte("{}")); err != nil {
		t.Fatal(err)
	}
	if got := <-other; got != "mesh.mod.o.event.something-else" {
		t.Fatalf("other got %s", got)
	}
}