package connection

import (
	"fmt"
	"strconv"
	"sync"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

var (
	message1 = "message-1"
	message2 = "message-2"
	message3 = "message-3"
	message4 = "message-4"
	message5 = "message-5"
	message6 = "message-6"
	message7 = "message-7"
)

func Test_MessageBuffer_Add(t *testing.T) {
	buf := newMessageBuffer(3)

	t.Run("insert without wrapping", func(t *testing.T) {
		buf.Insert("message-1")
		assert.Equal(t, 1, buf.insertIndex)

		buf.Insert("message-2")
		assert.Equal(t, 2, buf.insertIndex)

		buf.Insert("message-3")
		assert.Equal(
			t,
			[]message{
				{content: message1, new: true},
				{content: message2, new: true},
				{content: message3, new: true},
			},
			buf.messages,
		)
	})

	t.Run("insert that causes wrapping", func(t *testing.T) {
		buf.Insert("message-4")
		assert.Equal(
			t,
			[]message{
				{content: message4, new: true},
				{content: message2, new: true},
				{content: message3, new: true},
			},
			buf.messages)
	})
}

func Test_MessageBuffer_GetWaitsForFirstData(t *testing.T) {
	waitTime := 50 * time.Millisecond
	buf := newMessageBuffer(1)
	timer := time.NewTimer(waitTime)
	startTime := time.Now()

	go func() {
		<-timer.C
		buf.Insert("delayed-message")
	}()

	msg, err := buf.Get()
	assert.NoError(t, err)

	endTime := time.Now()

	assert.Equal(t, "delayed-message", msg)
	assert.GreaterOrEqual(t, endTime.Sub(startTime), waitTime)
}

func Test_MessageBuffer_GetWaitsForNewData(t *testing.T) {
	buf := newMessageBuffer(2)

	buf.Insert("message-1")
	msg, err := buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, "message-1", msg)

	go func() {
		timer := time.NewTimer(100 * time.Millisecond)
		<-timer.C
		buf.Insert("delayed-message")
	}()

	msg, err = buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, "delayed-message", msg)
}

func Test_MessageBuffer_IndexesAreCorrectAfterOverwritingOldData(t *testing.T) {
	buf := newMessageBuffer(2)

	buf.Insert("message-1")
	buf.Insert("message-2")

	assert.Equal(
		t,
		[]message{
			{content: message1, new: true},
			{content: message2, new: true},
		},
		buf.messages)

	buf.Insert("message-3")
	assert.Equal(
		t,
		[]message{
			{content: message3, new: true},
			{content: message2, new: true},
		},
		buf.messages)

	msg, err := buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, "message-2", msg)
}

func Test_MessageBuffer_GetWaitsForNewDataIfOldOneWasAlreadyGotten(t *testing.T) {
	buf := newMessageBuffer(2)

	buf.Insert(message1)
	msg, err := buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, message1, msg)

	buf.Insert(message2)
	msg, err = buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, message2, msg)

	go func() {
		<-time.NewTimer(100 * time.Millisecond).C
		buf.Insert(message3)
	}()

	msg, err = buf.Get()
	assert.NoError(t, err)
	assert.Equal(t, message3, msg)

}

func Test_MessageBuffer_InsertCatchesUpWithRead(t *testing.T) {
	buf := newMessageBuffer(5)

	buf.Insert(message1)
	buf.Insert(message2)
	buf.Insert(message3)
	buf.Insert(message4)
	buf.Insert(message5)
	buf.Insert(message6)
	buf.Insert(message7)

	msg, err := buf.Get()

	assert.NoError(t, err)
	assert.Equal(t, message3, msg)
}

func Test_MessageBuffer_FuckShitUp(t *testing.T) {
	size := 10
	buf := newMessageBuffer(size)
	wg := sync.WaitGroup{}

	wg.Add(2)
	var readMsg = make([]string, 0)
	go func() {
		for i := 0; i < size*10; i++ {
			msg, _ := buf.Get()
			if msg == "99" {
				break
			}
			fmt.Println("i = ", i, ": msg = ", msg)
			readMsg = append(readMsg, msg)
		}
		wg.Done()
	}()

	go func() {
		for i := 0; i < size*10; i++ {
			if i%10 == 0 {
				timer := time.NewTimer(1 * time.Millisecond)
				<-timer.C
			}
			buf.Insert(strconv.Itoa(i))
		}
		wg.Done()
	}()

	wg.Wait()
	fmt.Println(buf.messages)
	fmt.Println(readMsg)
}