// Copyright 2020-2023 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package jetstream

import (
	"context"
	"errors"
	"testing"
	"time"

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

func TestConsumerInfo(t *testing.T) {
	srv := RunBasicJetStreamServer()
	defer shutdownJSServerAndRemoveStorage(t, srv)
	t.Run("get consumer info, ok", func(t *testing.T) {
		nc, err := nats.Connect(srv.ClientURL())
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		js, err := New(nc)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		defer nc.Close()

		s, err := js.CreateStream(ctx, StreamConfig{Name: "foo", Subjects: []string{"FOO.*"}})
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		c, err := s.AddConsumer(ctx, ConsumerConfig{
			Durable:     "cons",
			AckPolicy:   AckExplicitPolicy,
			Description: "test consumer",
		})
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		info, err := c.Info(ctx)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		if info.Stream != "foo" {
			t.Fatalf("Invalid stream name; expected: 'foo'; got: %s", info.Stream)
		}
		if info.Config.Description != "test consumer" {
			t.Fatalf("Invalid consumer description; expected: 'test consumer'; got: %s", info.Config.Description)
		}

		// update consumer and see if info is updated
		_, err = s.AddConsumer(ctx, ConsumerConfig{
			Durable:     "cons",
			AckPolicy:   AckExplicitPolicy,
			Description: "updated consumer",
		})
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		info, err = c.Info(ctx)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		if info.Stream != "foo" {
			t.Fatalf("Invalid stream name; expected: 'foo'; got: %s", info.Stream)
		}
		if info.Config.Description != "updated consumer" {
			t.Fatalf("Invalid consumer description; expected: 'updated consumer'; got: %s", info.Config.Description)
		}
	})

	t.Run("consumer does not exist", func(t *testing.T) {
		nc, err := nats.Connect(srv.ClientURL())
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		js, err := New(nc)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		defer nc.Close()

		s, err := js.Stream(ctx, "foo")
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		c, err := s.Consumer(ctx, "cons")
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		if err := s.DeleteConsumer(ctx, "cons"); err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
		_, err = c.Info(ctx)
		if err == nil || !errors.Is(err, ErrConsumerNotFound) {
			t.Fatalf("Expected error: %v; got: %v", ErrConsumerNotFound, err)
		}
	})
}

func TestConsumerCachedInfo(t *testing.T) {
	srv := RunBasicJetStreamServer()
	defer shutdownJSServerAndRemoveStorage(t, srv)
	nc, err := nats.Connect(srv.ClientURL())
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	js, err := New(nc)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	defer nc.Close()

	s, err := js.CreateStream(ctx, StreamConfig{Name: "foo", Subjects: []string{"FOO.*"}})
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	c, err := s.AddConsumer(ctx, ConsumerConfig{
		Durable:     "cons",
		AckPolicy:   AckExplicitPolicy,
		Description: "test consumer",
	})
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	info := c.CachedInfo()

	if info.Stream != "foo" {
		t.Fatalf("Invalid stream name; expected: 'foo'; got: %s", info.Stream)
	}
	if info.Config.Description != "test consumer" {
		t.Fatalf("Invalid consumer description; expected: 'test consumer'; got: %s", info.Config.Description)
	}

	// update consumer and see if info is updated
	_, err = s.AddConsumer(ctx, ConsumerConfig{
		Durable:     "cons",
		AckPolicy:   AckExplicitPolicy,
		Description: "updated consumer",
	})
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	info = c.CachedInfo()

	if info.Stream != "foo" {
		t.Fatalf("Invalid stream name; expected: 'foo'; got: %s", info.Stream)
	}

	// description should not be updated when using cached values
	if info.Config.Description != "test consumer" {
		t.Fatalf("Invalid consumer description; expected: 'updated consumer'; got: %s", info.Config.Description)
	}

}