/*
Copyright (c) 2015, Emir Pasic
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package singlylinkedlist

import (
	"fmt"
	"github.com/emirpasic/gods/utils"
	"testing"
)

func TestListAdd(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	if actualValue := list.Empty(); actualValue != false {
		t.Errorf("Got %v expected %v", actualValue, false)
	}
	if actualValue := list.Size(); actualValue != 3 {
		t.Errorf("Got %v expected %v", actualValue, 3)
	}
	if actualValue, ok := list.Get(2); actualValue != "c" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "c")
	}
}

func TestListRemove(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	list.Remove(2)
	if actualValue, ok := list.Get(2); actualValue != nil || ok {
		t.Errorf("Got %v expected %v", actualValue, nil)
	}
	list.Remove(1)
	list.Remove(0)
	list.Remove(0) // no effect
	if actualValue := list.Empty(); actualValue != true {
		t.Errorf("Got %v expected %v", actualValue, true)
	}
	if actualValue := list.Size(); actualValue != 0 {
		t.Errorf("Got %v expected %v", actualValue, 0)
	}
}

func TestListGet(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	if actualValue, ok := list.Get(0); actualValue != "a" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "a")
	}
	if actualValue, ok := list.Get(1); actualValue != "b" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "b")
	}
	if actualValue, ok := list.Get(2); actualValue != "c" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "c")
	}
	if actualValue, ok := list.Get(3); actualValue != nil || ok {
		t.Errorf("Got %v expected %v", actualValue, nil)
	}
	list.Remove(0)
	if actualValue, ok := list.Get(0); actualValue != "b" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "b")
	}
}

func TestListSwap(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	list.Swap(0, 1)
	if actualValue, ok := list.Get(0); actualValue != "b" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "c")
	}
}

func TestListSort(t *testing.T) {
	list := New()
	list.Sort(utils.StringComparator)
	list.Add("e", "f", "g", "a", "b", "c", "d")
	list.Sort(utils.StringComparator)
	for i := 1; i < list.Size(); i++ {
		a, _ := list.Get(i - 1)
		b, _ := list.Get(i)
		if a.(string) > b.(string) {
			t.Errorf("Not sorted! %s > %s", a, b)
		}
	}
}

func TestListClear(t *testing.T) {
	list := New()
	list.Add("e", "f", "g", "a", "b", "c", "d")
	list.Clear()
	if actualValue := list.Empty(); actualValue != true {
		t.Errorf("Got %v expected %v", actualValue, true)
	}
	if actualValue := list.Size(); actualValue != 0 {
		t.Errorf("Got %v expected %v", actualValue, 0)
	}
}

func TestListContains(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	if actualValue := list.Contains("a"); actualValue != true {
		t.Errorf("Got %v expected %v", actualValue, true)
	}
	if actualValue := list.Contains("a", "b", "c"); actualValue != true {
		t.Errorf("Got %v expected %v", actualValue, true)
	}
	if actualValue := list.Contains("a", "b", "c", "d"); actualValue != false {
		t.Errorf("Got %v expected %v", actualValue, false)
	}
	list.Clear()
	if actualValue := list.Contains("a"); actualValue != false {
		t.Errorf("Got %v expected %v", actualValue, false)
	}
	if actualValue := list.Contains("a", "b", "c"); actualValue != false {
		t.Errorf("Got %v expected %v", actualValue, false)
	}
}

func TestListValues(t *testing.T) {
	list := New()
	list.Add("a")
	list.Add("b", "c")
	if actualValue, expectedValue := fmt.Sprintf("%s%s%s", list.Values()...), "abc"; actualValue != expectedValue {
		t.Errorf("Got %v expected %v", actualValue, expectedValue)
	}
}

func TestListInsert(t *testing.T) {
	list := New()
	list.Insert(0, "b", "c")
	list.Insert(0, "a")
	list.Insert(10, "x") // ignore
	if actualValue := list.Size(); actualValue != 3 {
		t.Errorf("Got %v expected %v", actualValue, 3)
	}
	list.Insert(3, "d") // append
	if actualValue := list.Size(); actualValue != 4 {
		t.Errorf("Got %v expected %v", actualValue, 4)
	}
	if actualValue, expectedValue := fmt.Sprintf("%s%s%s%s", list.Values()...), "abcd"; actualValue != expectedValue {
		t.Errorf("Got %v expected %v", actualValue, expectedValue)
	}
}

func TestListEach(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	list.Each(func(index int, value interface{}) {
		switch index {
		case 0:
			if actualValue, expectedValue := value, "a"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		case 1:
			if actualValue, expectedValue := value, "b"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		case 2:
			if actualValue, expectedValue := value, "c"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		default:
			t.Errorf("Too many")
		}
	})
}

func TestListMap(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	mappedList := list.Map(func(index int, value interface{}) interface{} {
		return "mapped: " + value.(string)
	})
	if actualValue, _ := mappedList.Get(0); actualValue != "mapped: a" {
		t.Errorf("Got %v expected %v", actualValue, "mapped: a")
	}
	if actualValue, _ := mappedList.Get(1); actualValue != "mapped: b" {
		t.Errorf("Got %v expected %v", actualValue, "mapped: b")
	}
	if actualValue, _ := mappedList.Get(2); actualValue != "mapped: c" {
		t.Errorf("Got %v expected %v", actualValue, "mapped: c")
	}
	if mappedList.Size() != 3 {
		t.Errorf("Got %v expected %v", mappedList.Size(), 3)
	}
}

func TestListSelect(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	selectedList := list.Select(func(index int, value interface{}) bool {
		return value.(string) >= "a" && value.(string) <= "b"
	})
	if actualValue, _ := selectedList.Get(0); actualValue != "a" {
		t.Errorf("Got %v expected %v", actualValue, "value: a")
	}
	if actualValue, _ := selectedList.Get(1); actualValue != "b" {
		t.Errorf("Got %v expected %v", actualValue, "value: b")
	}
	if selectedList.Size() != 2 {
		t.Errorf("Got %v expected %v", selectedList.Size(), 3)
	}
}

func TestListAny(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	any := list.Any(func(index int, value interface{}) bool {
		return value.(string) == "c"
	})
	if any != true {
		t.Errorf("Got %v expected %v", any, true)
	}
	any = list.Any(func(index int, value interface{}) bool {
		return value.(string) == "x"
	})
	if any != false {
		t.Errorf("Got %v expected %v", any, false)
	}
}
func TestListAll(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	all := list.All(func(index int, value interface{}) bool {
		return value.(string) >= "a" && value.(string) <= "c"
	})
	if all != true {
		t.Errorf("Got %v expected %v", all, true)
	}
	all = list.All(func(index int, value interface{}) bool {
		return value.(string) >= "a" && value.(string) <= "b"
	})
	if all != false {
		t.Errorf("Got %v expected %v", all, false)
	}
}
func TestListFind(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	foundIndex, foundValue := list.Find(func(index int, value interface{}) bool {
		return value.(string) == "c"
	})
	if foundValue != "c" || foundIndex != 2 {
		t.Errorf("Got %v at %v expected %v at %v", foundValue, foundIndex, "c", 2)
	}
	foundIndex, foundValue = list.Find(func(index int, value interface{}) bool {
		return value.(string) == "x"
	})
	if foundValue != nil || foundIndex != -1 {
		t.Errorf("Got %v at %v expected %v at %v", foundValue, foundIndex, nil, nil)
	}
}
func TestListChaining(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	chainedList := list.Select(func(index int, value interface{}) bool {
		return value.(string) > "a"
	}).Map(func(index int, value interface{}) interface{} {
		return value.(string) + value.(string)
	})
	if chainedList.Size() != 2 {
		t.Errorf("Got %v expected %v", chainedList.Size(), 2)
	}
	if actualValue, ok := chainedList.Get(0); actualValue != "bb" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "b")
	}
	if actualValue, ok := chainedList.Get(1); actualValue != "cc" || !ok {
		t.Errorf("Got %v expected %v", actualValue, "c")
	}
}

func TestListIteratorNextOnEmpty(t *testing.T) {
	list := New()
	it := list.Iterator()
	for it.Next() {
		t.Errorf("Shouldn't iterate on empty list")
	}
}

func TestListIteratorNext(t *testing.T) {
	list := New()
	list.Add("a", "b", "c")
	it := list.Iterator()
	count := 0
	for it.Next() {
		count++
		index := it.Index()
		value := it.Value()
		switch index {
		case 0:
			if actualValue, expectedValue := value, "a"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		case 1:
			if actualValue, expectedValue := value, "b"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		case 2:
			if actualValue, expectedValue := value, "c"; actualValue != expectedValue {
				t.Errorf("Got %v expected %v", actualValue, expectedValue)
			}
		default:
			t.Errorf("Too many")
		}
	}
	if actualValue, expectedValue := count, 3; actualValue != expectedValue {
		t.Errorf("Got %v expected %v", actualValue, expectedValue)
	}
}

func TestListIteratorReset(t *testing.T) {
	list := New()
	it := list.Iterator()
	it.Reset()
	list.Add("a", "b", "c")
	for it.Next() {
	}
	it.Reset()
	it.Next()
	if index, value := it.Index(), it.Value(); index != 0 || value != "a" {
		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "a")
	}
}

func BenchmarkList(b *testing.B) {
	for i := 0; i < b.N; i++ {
		list := New()
		for n := 0; n < 1000; n++ {
			list.Add(i)
		}
		for !list.Empty() {
			list.Remove(0)
		}
	}
}