package redis_test

import (
	"errors"
	"time"

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

	"gopkg.in/redis.v3"
	"gopkg.in/redis.v3/internal/pool"
)

var _ = Describe("pool", func() {
	var client *redis.Client

	BeforeEach(func() {
		client = redis.NewClient(redisOptions())
		Expect(client.FlushDb().Err()).NotTo(HaveOccurred())
	})

	AfterEach(func() {
		Expect(client.Close()).NotTo(HaveOccurred())
	})

	It("should respect max size", func() {
		perform(1000, func(id int) {
			val, err := client.Ping().Result()
			Expect(err).NotTo(HaveOccurred())
			Expect(val).To(Equal("PONG"))
		})

		pool := client.Pool()
		Expect(pool.Len()).To(BeNumerically("<=", 10))
		Expect(pool.FreeLen()).To(BeNumerically("<=", 10))
		Expect(pool.Len()).To(Equal(pool.FreeLen()))
	})

	It("should respect max on multi", func() {
		perform(1000, func(id int) {
			var ping *redis.StatusCmd

			multi := client.Multi()
			cmds, err := multi.Exec(func() error {
				ping = multi.Ping()
				return nil
			})
			Expect(err).NotTo(HaveOccurred())
			Expect(cmds).To(HaveLen(1))
			Expect(ping.Err()).NotTo(HaveOccurred())
			Expect(ping.Val()).To(Equal("PONG"))
			Expect(multi.Close()).NotTo(HaveOccurred())
		})

		pool := client.Pool()
		Expect(pool.Len()).To(BeNumerically("<=", 10))
		Expect(pool.FreeLen()).To(BeNumerically("<=", 10))
		Expect(pool.Len()).To(Equal(pool.FreeLen()))
	})

	It("should respect max on pipelines", func() {
		perform(1000, func(id int) {
			pipe := client.Pipeline()
			ping := pipe.Ping()
			cmds, err := pipe.Exec()
			Expect(err).NotTo(HaveOccurred())
			Expect(cmds).To(HaveLen(1))
			Expect(ping.Err()).NotTo(HaveOccurred())
			Expect(ping.Val()).To(Equal("PONG"))
			Expect(pipe.Close()).NotTo(HaveOccurred())
		})

		pool := client.Pool()
		Expect(pool.Len()).To(BeNumerically("<=", 10))
		Expect(pool.FreeLen()).To(BeNumerically("<=", 10))
		Expect(pool.Len()).To(Equal(pool.FreeLen()))
	})

	It("should respect max on pubsub", func() {
		connPool := client.Pool()
		connPool.(*pool.ConnPool).DialLimiter = nil

		perform(1000, func(id int) {
			pubsub := client.PubSub()
			Expect(pubsub.Subscribe()).NotTo(HaveOccurred())
			Expect(pubsub.Close()).NotTo(HaveOccurred())
		})

		Expect(connPool.Len()).To(Equal(connPool.FreeLen()))
		Expect(connPool.Len()).To(BeNumerically("<=", 10))
	})

	It("should remove broken connections", func() {
		cn, err := client.Pool().Get()
		Expect(err).NotTo(HaveOccurred())
		cn.NetConn = &badConn{}
		Expect(client.Pool().Put(cn)).NotTo(HaveOccurred())

		err = client.Ping().Err()
		Expect(err).To(MatchError("bad connection"))

		val, err := client.Ping().Result()
		Expect(err).NotTo(HaveOccurred())
		Expect(val).To(Equal("PONG"))

		pool := client.Pool()
		Expect(pool.Len()).To(Equal(1))
		Expect(pool.FreeLen()).To(Equal(1))

		stats := pool.Stats()
		Expect(stats.Requests).To(Equal(uint32(4)))
		Expect(stats.Hits).To(Equal(uint32(3)))
		Expect(stats.Waits).To(Equal(uint32(0)))
		Expect(stats.Timeouts).To(Equal(uint32(0)))
	})

	It("should reuse connections", func() {
		for i := 0; i < 100; i++ {
			val, err := client.Ping().Result()
			Expect(err).NotTo(HaveOccurred())
			Expect(val).To(Equal("PONG"))
		}

		pool := client.Pool()
		Expect(pool.Len()).To(Equal(1))
		Expect(pool.FreeLen()).To(Equal(1))

		stats := pool.Stats()
		Expect(stats.Requests).To(Equal(uint32(101)))
		Expect(stats.Hits).To(Equal(uint32(100)))
		Expect(stats.Waits).To(Equal(uint32(0)))
		Expect(stats.Timeouts).To(Equal(uint32(0)))
	})

	It("should unblock client when connection is removed", func() {
		pool := client.Pool()

		// Reserve one connection.
		cn, err := pool.Get()
		Expect(err).NotTo(HaveOccurred())

		// Reserve the rest of connections.
		for i := 0; i < 9; i++ {
			_, err := pool.Get()
			Expect(err).NotTo(HaveOccurred())
		}

		var ping *redis.StatusCmd
		started := make(chan bool, 1)
		done := make(chan bool, 1)
		go func() {
			started <- true
			ping = client.Ping()
			done <- true
		}()
		<-started

		// Check that Ping is blocked.
		select {
		case <-done:
			panic("Ping is not blocked")
		default:
			// ok
		}

		err = pool.Replace(cn, errors.New("test"))
		Expect(err).NotTo(HaveOccurred())

		// Check that Ping is unblocked.
		select {
		case <-done:
			// ok
		case <-time.After(time.Second):
			panic("Ping is not unblocked")
		}
		Expect(ping.Err()).NotTo(HaveOccurred())
	})

	It("should rate limit dial", func() {
		pool := client.Pool()

		var rateErr error
		for i := 0; i < 1000; i++ {
			cn, err := pool.Get()
			if err != nil {
				rateErr = err
				break
			}

			_ = pool.Replace(cn, errors.New("test"))
		}

		Expect(rateErr).To(MatchError(`redis: you open connections too fast (last_error="test")`))
	})
})