package avldup

import (
	"bytes"
	"encoding/gob"
	"io/ioutil"
	"log"
	"os"
	"testing"

	"github.com/Pallinder/go-randomdata"
	"github.com/davecgh/go-spew/spew"
	"github.com/emirpasic/gods/trees/avltree"
	"github.com/emirpasic/gods/trees/redblacktree"

	"github.com/emirpasic/gods/utils"
)

const CompartorSize = 500000
const NumberMax = 60000000

func TestSave(t *testing.T) {

	f, err := os.OpenFile("../l.log", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
	if err != nil {
		log.Println(err)
	}

	//fmt.Println(userBytes)

	var l []int
	m := make(map[int]int)
	for i := 0; len(l) < CompartorSize; i++ {
		v := randomdata.Number(0, NumberMax)
		if _, ok := m[v]; !ok {
			m[v] = v
			l = append(l, v)
		}
	}

	var result bytes.Buffer
	encoder := gob.NewEncoder(&result)
	encoder.Encode(l)
	lbytes := result.Bytes()
	f.Write(lbytes)

}

func loadTestData() []int {
	data, err := ioutil.ReadFile("../l.log")
	if err != nil {
		log.Println(err)
	}
	var l []int
	decoder := gob.NewDecoder(bytes.NewReader(data))
	decoder.Decode(&l)
	return l
}

func TestDupKey(t *testing.T) {
	tree1 := New(utils.IntComparator)
	tree2 := avltree.NewWithIntComparator()

	for i := 0; i < CompartorSize/1000; i++ {
		v := randomdata.Number(0, NumberMax)
		tree1.Put(v)
		tree2.Put(v, v)
	}

	tree1.Put(500)
	tree2.Put(500, 500)

	tree1.Put(500)
	tree2.Put(500, 500)

	if tree1.Size() == tree2.Size() {
		t.Error("tree size is  equal")
	}

	if tree1.String() == tree2.String() {
		t.Error(tree1.String())
	}
}

func TestIterator(t *testing.T) {
	avl := New(utils.IntComparator)
	for _, v := range []int{1, 2, 7, 4, 5, 6, 7, 14, 15, 20, 30, 21, 3} {
		// t.Error(v)
		avl.Put(v)

	}
	// ` AVLTree
	// │       ┌── 30
	// │       │   └── 21
	// │   ┌── 20
	// │   │   └── 15
	// └── 14
	// 	   │       ┌── 7
	// 	   │   ┌── 7
	// 	   │   │   └── 6
	// 	   └── 5
	// 		   │   ┌── 4
	// 		   │   │   └── 3
	// 		   └── 2
	// 			   └── 1`

	iter := avl.Iterator() // root start point

	l := []int{14, 15, 20, 21, 30}

	for i := 0; iter.Prev(); i++ {
		if iter.Value().(int) != l[i] {
			t.Error("iter prev error", iter.Value(), l[i])
		}
	}

	iter.Prev()
	if iter.Value().(int) != 30 {
		t.Error("prev == false", iter.Value(), iter.Prev(), iter.Value())
	}

	l = []int{21, 20, 15, 14, 7, 7, 6, 5, 4, 3, 2, 1}
	for i := 0; iter.Next(); i++ { // cur is 30 next is 21
		if iter.Value().(int) != l[i] {
			t.Error(iter.Value())
		}
	}

	if iter.Next() != false {
		t.Error("Next is error, cur is tail, val = 1 Next return false")
	}
	if iter.Value().(int) != 1 { // cur is 1
		t.Error("next == false", iter.Value(), iter.Next(), iter.Value())
	}

	if iter.Prev() != true && iter.Value().(int) != 2 {
		t.Error("next to prev is error")
	}
}

func TestGetAround(t *testing.T) {
	avl := New(utils.IntComparator)
	for _, v := range []int{7, 14, 15, 20, 30, 21, 40, 40, 50, 3, 40, 40, 40} {
		avl.Put(v)
	}

	if spew.Sprint(avl.GetAround(30)) != "[40 30 21]" {
		t.Error("avl.GetAround(40)) is error", spew.Sprint(avl.GetAround(30)))
	}

	if spew.Sprint(avl.GetAround(40)) != "[40 40 30]" {
		t.Error("avl.GetAround(40)) is error", spew.Sprint(avl.GetAround(50)))
	}

	if spew.Sprint(avl.GetAround(50)) != "[<nil> 50 40]" {
		t.Error("avl.GetAround(40)) is error", spew.Sprint(avl.GetAround(50)))
	}
}

// for test error case
func TestPutStable(t *testing.T) {
	// avl := New(utils.IntComparator)
	// gods := avltree.NewWithIntComparator()
	// // 44908, 34985, 62991, 4201, 27210, 30707
	// for _, v := range []int{2383, 7666, 3055, 39016, 57092, 27897, 36513, 1562, 22574, 23202} {
	// 	t.Error(v)
	// 	t.Error(avl.debugString())
	// 	avl.Put(v)
	// 	gods.Put(v, v)
	// 	t.Error(avl.debugString())
	// 	t.Error(gods.String())
	// }
}

func TestPutComparatorRandom(t *testing.T) {

	for n := 0; n < 300000; n++ {
		avl := New(utils.IntComparator)
		godsavl := avltree.NewWithIntComparator()

		content := ""
		m := make(map[int]int)
		for i := 0; len(m) < 10; i++ {
			v := randomdata.Number(0, 65535)
			if _, ok := m[v]; !ok {
				m[v] = v
				content += spew.Sprint(v) + ","
				// t.Error(v)
				avl.Put(v)
				// t.Error(avl.String())
				godsavl.Put(v, v)
			}
		}

		if avl.String() != godsavl.String() {
			t.Error(godsavl.String())
			t.Error(avl.debugString())
			t.Error(content, n)
			break
		}
	}
}

func TestGet(t *testing.T) {
	avl := New(utils.IntComparator)
	for _, v := range []int{2383, 7666, 3055, 39016, 57092, 27897, 36513, 1562, 22574, 23202} {
		avl.Put(v)
	}

	result := `
│           ┌── 57092
│       ┌── 39016
│       │   └── 36513
│   ┌── 27897
│   │   │   ┌── 23202
│   │   └── 22574
└── 7666
    │   ┌── 3055
    └── 2383
        └── 1562
`

	s1 := avl.String()
	s2 := "AVLTree" + result
	if s1 != s2 {
		t.Error(s1, s2)
	}

	for _, v := range []int{2383, 7666, 3055, 39016, 57092, 27897, 36513, 1562, 22574, 23202} {
		v, ok := avl.Get(v)
		if !ok {
			t.Error("the val not found ", v)
		}
	}

	if v, ok := avl.Get(10000); ok {
		t.Error("the val(1000) is not in tree, but is found", v)
	}

}

func TestRemoveAll(t *testing.T) {

ALL:
	for c := 0; c < 5000; c++ {
		avl := New(utils.IntComparator)
		gods := avltree.NewWithIntComparator()
		var l []int
		m := make(map[int]int)

		for i := 0; len(l) < 100; i++ {
			v := randomdata.Number(0, 100000)
			if _, ok := m[v]; !ok {
				m[v] = v
				l = append(l, v)
				avl.Put(v)
				gods.Put(v, v)
			}
		}

		for i := 0; i < 100; i++ {
			avl.Remove(l[i])
			gods.Remove(l[i])
			s1 := spew.Sprint(avl.TraversalDepth(-1))
			s2 := spew.Sprint(gods.Values())
			if s1 != s2 {
				t.Error("avl remove error", "avlsize = ", avl.Size())
				t.Error(s1)
				t.Error(s2)
				break ALL
			}
		}
	}
}

func TestRemove(t *testing.T) {

ALL:

	for N := 0; N < 500000; N++ {
		avl := New(utils.IntComparator)
		gods := avltree.NewWithIntComparator()

		var l []int
		m := make(map[int]int)

		for i := 0; len(l) < 10; i++ {
			v := randomdata.Number(0, 100)
			if _, ok := m[v]; !ok {
				l = append(l, v)
				m[v] = v
				avl.Put(v)
				gods.Put(v, v)
			}
		}

		src1 := avl.String()
		src2 := gods.String()

		for i := 0; i < 10; i++ {
			avl.Remove(l[i])
			gods.Remove(l[i])
			if spew.Sprint(gods.Values()) != spew.Sprint(avl.TraversalDepth(-1)) && avl.size != 0 {
				// if gods.String() != avl.String() && gods.Size() != 0 && avl.size != 0 {
				t.Error(src1)
				t.Error(src2)
				t.Error(avl.debugString())
				t.Error(gods.String())
				t.Error(l[i])
				// t.Error(avl.TraversalDepth(-1))
				// t.Error(gods.Values())
				break ALL
			}
		}
	}
}

func BenchmarkIterator(b *testing.B) {
	tree := New(utils.IntComparator)

	l := loadTestData()
	b.N = len(l)

	for _, v := range l {
		tree.Put(v)
	}

	b.ResetTimer()
	b.StartTimer()
	iter := tree.Iterator()
	for iter.Next() {
	}
	for iter.Prev() {
	}
	for iter.Next() {
	}

}

func BenchmarkGodsIterator(b *testing.B) {
	tree := avltree.NewWithIntComparator()

	l := loadTestData()
	b.N = len(l)

	for _, v := range l {
		tree.Put(v, v)
	}

	b.ResetTimer()
	b.StartTimer()
	iter := tree.Iterator()
	for iter.Next() {
	}
	for iter.Prev() {
	}
	for iter.Next() {
	}
}

func BenchmarkRemove(b *testing.B) {
	tree := New(utils.IntComparator)

	l := loadTestData()

	b.N = len(l)
	for _, v := range l {
		tree.Put(v)
	}

	b.ResetTimer()
	b.StartTimer()

	for i := 0; i < len(l); i++ {
		tree.Remove(l[i])
	}
}

func BenchmarkGodsRemove(b *testing.B) {
	tree := avltree.NewWithIntComparator()

	l := loadTestData()

	b.N = len(l)
	for _, v := range l {
		tree.Put(v, v)
	}

	b.ResetTimer()
	b.StartTimer()

	for i := 0; i < len(l); i++ {
		tree.Remove(l[i])
	}
}

func BenchmarkGodsRBRemove(b *testing.B) {
	tree := redblacktree.NewWithIntComparator()

	l := loadTestData()

	b.N = len(l)
	for _, v := range l {
		tree.Put(v, v)
	}

	b.ResetTimer()
	b.StartTimer()

	for i := 0; i < len(l); i++ {
		tree.Remove(l[i])
	}
}

func BenchmarkGet(b *testing.B) {

	avl := New(utils.IntComparator)

	l := loadTestData()
	b.N = len(l)

	b.ResetTimer()
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		avl.Get(l[i])
	}
}

func BenchmarkGodsRBGet(b *testing.B) {
	tree := redblacktree.NewWithIntComparator()

	l := loadTestData()
	b.N = len(l)

	b.ResetTimer()
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		tree.Get(l[i])
	}
}

func BenchmarkGodsAvlGet(b *testing.B) {
	tree := avltree.NewWithIntComparator()

	l := loadTestData()
	b.N = len(l)

	b.ResetTimer()
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		tree.Get(l[i])
	}
}

func BenchmarkPut(b *testing.B) {
	avl := New(utils.IntComparator)

	l := loadTestData()

	b.ResetTimer()
	b.StartTimer()

	b.N = len(l)
	for _, v := range l {
		avl.Put(v)
	}

}

func BenchmarkGodsRBPut(b *testing.B) {
	tree := redblacktree.NewWithIntComparator()

	l := loadTestData()

	b.ResetTimer()
	b.StartTimer()

	b.N = len(l)
	for _, v := range l {
		tree.Put(v, v)
	}
}

func BenchmarkGodsPut(b *testing.B) {
	tree := avltree.NewWithIntComparator()

	l := loadTestData()

	b.ResetTimer()
	b.StartTimer()

	b.N = len(l)
	for _, v := range l {
		tree.Put(v, v)
	}
}