//go:build integration

package link

import (
	"context"
	"crypto/ed25519"
	"encoding/json"
	"strings"
	"testing"
	"time"

	"github.com/nats-io/nats.go"
	"github.com/novox/mesh-controller/internal/broker"
	"github.com/novox/mesh-controller/internal/testbus"
)

func TestAHandOverIsAskedOfTheMachineAndItsAnswerComesBack(t *testing.T) {
	url := testbus.URL(t)
	conn, err := nats.Connect(url)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(conn.Close)

	signer, public := testSigner(t)
	var heard HandOverAsk
	engine, err := conn.Subscribe(broker.AskHandOverSubject("laptop"), func(msg *nats.Msg) {
		var signed SignedHandOver
		_ = json.Unmarshal(msg.Data, &signed)
		if !ed25519.Verify(public, append([]byte(HandOverContext), signed.Ask...), signed.Signature) {
			_ = msg.Respond([]byte(`{"refused":"not the mesh's signature"}`))
			return
		}
		_ = json.Unmarshal(signed.Ask, &heard)
		switch heard.Path {
		case "/srv/notes":
			body, _ := json.Marshal(HandOverAnswer{Said: "/srv/notes (notes.data) is handed to the mesh by " + heard.By})
			_ = msg.Respond(body)
		case "/srv/empty":
			_ = msg.Respond([]byte(`{}`))
		default:
			body, _ := json.Marshal(HandOverAnswer{Refused: heard.Path + " is not a directory this machine uses as found; nothing was handed over"})
			_ = msg.Respond(body)
		}
	})
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = engine.Unsubscribe() })

	ctx := context.Background()
	a, err := AskHandOver(ctx, conn, signer, "laptop", "/srv/notes", "jo through mesh-cli on anchor", 5*time.Second)
	if err != nil || a.Refused != "" || !strings.Contains(a.Said, "handed to the mesh by jo through mesh-cli on anchor") {
		t.Fatalf("answered %+v, %v", a, err)
	}
	if heard.Node != "laptop" || heard.Path != "/srv/notes" || heard.By != "jo through mesh-cli on anchor" {
		t.Fatalf("the engine heard %+v", heard)
	}
	a, err = AskHandOver(ctx, conn, signer, "laptop", "/srv/other", "jo", 5*time.Second)
	if err != nil || a.Said != "" || !strings.Contains(a.Refused, "nothing was handed over") {
		t.Fatalf("a refusal came back as %+v, %v", a, err)
	}
	if _, err := AskHandOver(ctx, conn, signer, "laptop", "/srv/empty", "jo", 5*time.Second); err == nil ||
		!strings.Contains(err.Error(), "neither") {
		t.Fatalf("an empty answer was taken: %v", err)
	}
	if _, err := AskHandOver(ctx, conn, signer, "anchor", "/srv/notes", "jo", 5*time.Second); err == nil ||
		!strings.Contains(err.Error(), "node-engine") {
		t.Fatalf("a machine with no engine listening: %v", err)
	}
	if _, err := AskHandOver(ctx, nil, signer, "anchor", "/srv/notes", "jo", time.Second); err == nil {
		t.Fatal("asked with no bus")
	}
}