package redis_test

import (
	"net"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	"github.com/go-redis/redis/v8"
)

var _ = Describe("Sentinel", func() {
	var client *redis.Client
	var master *redis.Client
	var masterPort string
	var sentinel *redis.SentinelClient

	BeforeEach(func() {
		client = redis.NewFailoverClient(&redis.FailoverOptions{
			MasterName:    sentinelName,
			SentinelAddrs: sentinelAddrs,
			MaxRetries:    -1,
		})
		Expect(client.FlushDB(ctx).Err()).NotTo(HaveOccurred())

		sentinel = redis.NewSentinelClient(&redis.Options{
			Addr:       ":" + sentinelPort1,
			MaxRetries: -1,
		})

		addr, err := sentinel.GetMasterAddrByName(ctx, sentinelName).Result()
		Expect(err).NotTo(HaveOccurred())

		master = redis.NewClient(&redis.Options{
			Addr:       net.JoinHostPort(addr[0], addr[1]),
			MaxRetries: -1,
		})
		masterPort = addr[1]

		// Wait until slaves are picked up by sentinel.
		Eventually(func() string {
			return sentinel1.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
		Eventually(func() string {
			return sentinel2.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
		Eventually(func() string {
			return sentinel3.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
	})

	AfterEach(func() {
		_ = client.Close()
		_ = master.Close()
		_ = sentinel.Close()
	})

	It("should facilitate failover", func() {
		// Set value on master.
		err := client.Set(ctx, "foo", "master", 0).Err()
		Expect(err).NotTo(HaveOccurred())

		// Verify.
		val, err := client.Get(ctx, "foo").Result()
		Expect(err).NotTo(HaveOccurred())
		Expect(val).To(Equal("master"))

		// Verify master->slaves sync.
		var slavesAddr []string
		Eventually(func() []string {
			slavesAddr = redis.GetSlavesAddrByName(ctx, sentinel, sentinelName)
			return slavesAddr
		}, "15s", "100ms").Should(HaveLen(2))
		Eventually(func() bool {
			sync := true
			for _, addr := range slavesAddr {
				slave := redis.NewClient(&redis.Options{
					Addr:       addr,
					MaxRetries: -1,
				})
				sync = slave.Get(ctx, "foo").Val() == "master"
				_ = slave.Close()
			}
			return sync
		}, "15s", "100ms").Should(BeTrue())

		// Create subscription.
		pub := client.Subscribe(ctx, "foo")
		ch := pub.Channel()

		// Kill master.
		err = master.Shutdown(ctx).Err()
		Expect(err).NotTo(HaveOccurred())
		Eventually(func() error {
			return master.Ping(ctx).Err()
		}, "15s", "100ms").Should(HaveOccurred())

		// Check that client picked up new master.
		Eventually(func() string {
			return client.Get(ctx, "foo").Val()
		}, "15s", "100ms").Should(Equal("master"))

		// Check if subscription is renewed.
		var msg *redis.Message
		Eventually(func() <-chan *redis.Message {
			_ = client.Publish(ctx, "foo", "hello").Err()
			return ch
		}, "15s", "100ms").Should(Receive(&msg))
		Expect(msg.Channel).To(Equal("foo"))
		Expect(msg.Payload).To(Equal("hello"))
		Expect(pub.Close()).NotTo(HaveOccurred())

		_, err = startRedis(masterPort)
		Expect(err).NotTo(HaveOccurred())
	})

	It("supports DB selection", func() {
		Expect(client.Close()).NotTo(HaveOccurred())

		client = redis.NewFailoverClient(&redis.FailoverOptions{
			MasterName:    sentinelName,
			SentinelAddrs: sentinelAddrs,
			DB:            1,
		})
		err := client.Ping(ctx).Err()
		Expect(err).NotTo(HaveOccurred())
	})
})

var _ = Describe("NewFailoverClusterClient", func() {
	var client *redis.ClusterClient
	var master *redis.Client
	var masterPort string

	BeforeEach(func() {
		client = redis.NewFailoverClusterClient(&redis.FailoverOptions{
			MasterName:    sentinelName,
			SentinelAddrs: sentinelAddrs,

			RouteRandomly: true,
		})
		Expect(client.FlushDB(ctx).Err()).NotTo(HaveOccurred())

		sentinel := redis.NewSentinelClient(&redis.Options{
			Addr:       ":" + sentinelPort1,
			MaxRetries: -1,
		})

		addr, err := sentinel.GetMasterAddrByName(ctx, sentinelName).Result()
		Expect(err).NotTo(HaveOccurred())

		master = redis.NewClient(&redis.Options{
			Addr:       net.JoinHostPort(addr[0], addr[1]),
			MaxRetries: -1,
		})
		masterPort = addr[1]

		// Wait until slaves are picked up by sentinel.
		Eventually(func() string {
			return sentinel1.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
		Eventually(func() string {
			return sentinel2.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
		Eventually(func() string {
			return sentinel3.Info(ctx).Val()
		}, "15s", "100ms").Should(ContainSubstring("slaves=2"))
	})

	AfterEach(func() {
		_ = client.Close()
		_ = master.Close()
	})

	It("should facilitate failover", func() {
		// Set value.
		err := client.Set(ctx, "foo", "master", 0).Err()
		Expect(err).NotTo(HaveOccurred())

		for i := 0; i < 100; i++ {
			// Verify.
			Eventually(func() string {
				return client.Get(ctx, "foo").Val()
			}, "15s", "1ms").Should(Equal("master"))
		}

		// Create subscription.
		ch := client.Subscribe(ctx, "foo").Channel()

		// Kill master.
		err = master.Shutdown(ctx).Err()
		Expect(err).NotTo(HaveOccurred())
		Eventually(func() error {
			return sentinelMaster.Ping(ctx).Err()
		}, "15s", "100ms").Should(HaveOccurred())

		// Check that client picked up new master.
		Eventually(func() string {
			return client.Get(ctx, "foo").Val()
		}, "15s", "100ms").Should(Equal("master"))

		// Check if subscription is renewed.
		var msg *redis.Message
		Eventually(func() <-chan *redis.Message {
			_ = client.Publish(ctx, "foo", "hello").Err()
			return ch
		}, "15s", "100ms").Should(Receive(&msg))
		Expect(msg.Channel).To(Equal("foo"))
		Expect(msg.Payload).To(Equal("hello"))

		_, err = startRedis(masterPort)
		Expect(err).NotTo(HaveOccurred())
	})
})