// Copyright © 2023 Roberto Hidalgo <event-gateway@un.rob.mx>
// SPDX-License-Identifier: Apache-2.0
package consul_test

import (
	"testing"
	"time"

	"git.rob.mx/nidito/event-gateway/internal/config"
	"git.rob.mx/nidito/event-gateway/internal/sink/debug"
	"git.rob.mx/nidito/event-gateway/internal/source/consul"
	"git.rob.mx/nidito/event-gateway/internal/source/types"
	"github.com/hashicorp/consul/api"
	"github.com/sirupsen/logrus"
)

type mockConsul struct {
	calls []string
}

func (mc *mockConsul) List(name string, q *api.QueryOptions) ([]*api.UserEvent, *api.QueryMeta, error) {
	time.Sleep(10 * time.Millisecond)
	mc.calls = append(mc.calls, name)
	return []*api.UserEvent{}, &api.QueryMeta{LastIndex: 100}, nil
}

func TestConsulReloads(t *testing.T) {
	logrus.SetLevel(logrus.DebugLevel)
	client := &mockConsul{}

	c := &consul.Source{Client: client}
	c.Initialize()

	if len(client.calls) != 0 {
		t.Fatalf("empty consul fetched events: %+v", client.calls)
	}

	target := &debug.Event{}
	l := &config.Listener{
		ID: "some-event-name",
		Source: &config.RawSource{
			Kind:   types.Consul,
			Config: []byte(`{}`),
		},
		Event: target,
	}

	if err := c.Register(l); err != nil {
		t.Fatalf("could not register source: %s", err)
	}
	time.Sleep(15 * time.Millisecond)
	if len(client.calls) == 0 {
		t.Fatalf("consul did not fetch events: %+v", client.calls)
	}

	had := len(client.calls)
	c.Deregister(l.ID)

	afterClear := append([]string{}, client.calls...)
	if len(afterClear) > had {
		t.Fatalf("consul continued fetching events (%d > %d): %+v", len(afterClear), had, afterClear)
	}

	if len(afterClear) != len(client.calls) {
		t.Fatalf("continued fetching after clear and run: %+v", client.calls)
	}
}