package list

import (
	"github.com/hdt3213/godis/lib/utils"
	"strconv"
	"strings"
	"testing"
)

func ToString(list *LinkedList) string {
	arr := make([]string, list.size)
	list.ForEach(func(i int, v interface{}) bool {
		integer, _ := v.(int)
		arr[i] = strconv.Itoa(integer)
		return true
	})
	return "[" + strings.Join(arr, ", ") + "]"
}

func TestAdd(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
	}
	list.ForEach(func(i int, v interface{}) bool {
		intVal, _ := v.(int)
		if intVal != i {
			t.Error("add test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(intVal))
		}
		return true
	})
}

func BenchmarkLinkedList_Add(b *testing.B) {
	list := Make()
	for i := 0; i < pageSize*10; i++ {
		list.Add(i)
	}
}

func BenchmarkLinkedList_Range(b *testing.B) {
	list := Make()
	for i := 0; i < pageSize*10; i++ {
		list.Add(i)
	}
	list.ForEach(func(i int, v interface{}) bool {
		return true
	})
}

func TestLinkedList_Contains(t *testing.T) {
	list := Make(1, 2, 3, 4)
	if !list.Contains(func(a interface{}) bool {
		return a == 1
	}) {
		t.Error("expect true actual false")
	}
	if list.Contains(func(a interface{}) bool {
		return a == -1
	}) {
		t.Error("expect false actual true")
	}
}

func TestGet(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
	}
	for i := 0; i < 10; i++ {
		v := list.Get(i)
		k, _ := v.(int)
		if i != k {
			t.Error("get test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(k))
		}
	}
}

func TestRemove(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
	}
	for i := 9; i >= 0; i-- {
		list.Remove(i)
		if i != list.Len() {
			t.Error("remove test fail: expected size " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(list.Len()))
		}
		list.ForEach(func(i int, v interface{}) bool {
			intVal, _ := v.(int)
			if intVal != i {
				t.Error("remove test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(intVal))
			}
			return true
		})
	}
}

func TestRemoveVal(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
		list.Add(i)
	}
	for index := 0; index < list.Len(); index++ {
		list.RemoveAllByVal(func(a interface{}) bool {
			return utils.Equals(a, index)
		})
		list.ForEach(func(i int, v interface{}) bool {
			intVal, _ := v.(int)
			if intVal == index {
				t.Error("remove test fail: found  " + strconv.Itoa(index) + " at index: " + strconv.Itoa(i))
			}
			return true
		})
	}

	list = Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
		list.Add(i)
	}
	for i := 0; i < 10; i++ {
		list.RemoveByVal(func(a interface{}) bool {
			return utils.Equals(a, i)
		}, 1)
	}
	list.ForEach(func(i int, v interface{}) bool {
		intVal, _ := v.(int)
		if intVal != i {
			t.Error("test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(intVal))
		}
		return true
	})
	for i := 0; i < 10; i++ {
		list.RemoveByVal(func(a interface{}) bool {
			return utils.Equals(a, i)
		}, 1)
	}
	if list.Len() != 0 {
		t.Error("test fail: expected 0, actual: " + strconv.Itoa(list.Len()))
	}

	list = Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
		list.Add(i)
	}
	for i := 0; i < 10; i++ {
		list.ReverseRemoveByVal(func(a interface{}) bool {
			return a == i
		}, 1)
	}
	list.ForEach(func(i int, v interface{}) bool {
		intVal, _ := v.(int)
		if intVal != i {
			t.Error("test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(intVal))
		}
		return true
	})
	for i := 0; i < 10; i++ {
		list.ReverseRemoveByVal(func(a interface{}) bool {
			return a == i
		}, 1)
	}
	if list.Len() != 0 {
		t.Error("test fail: expected 0, actual: " + strconv.Itoa(list.Len()))
	}

}

func TestInsert(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
	}
	for i := 0; i < 10; i++ {
		list.Insert(i*2, i)

		list.ForEach(func(j int, v interface{}) bool {
			var expected int
			if j < (i+1)*2 {
				if j%2 == 0 {
					expected = j / 2
				} else {
					expected = (j - 1) / 2
				}
			} else {
				expected = j - i - 1
			}
			actual, _ := list.Get(j).(int)
			if actual != expected {
				t.Error("insert test fail: at i " + strconv.Itoa(i) + " expected " + strconv.Itoa(expected) + ", actual: " + strconv.Itoa(actual))
			}
			return true
		})

		for j := 0; j < list.Len(); j++ {
			var expected int
			if j < (i+1)*2 {
				if j%2 == 0 {
					expected = j / 2
				} else {
					expected = (j - 1) / 2
				}
			} else {
				expected = j - i - 1
			}
			actual, _ := list.Get(j).(int)
			if actual != expected {
				t.Error("insert test fail: at i " + strconv.Itoa(i) + " expected " + strconv.Itoa(expected) + ", actual: " + strconv.Itoa(actual))
			}
		}

	}
}

func TestRemoveLast(t *testing.T) {
	list := Make()
	for i := 0; i < 10; i++ {
		list.Add(i)
	}
	for i := 9; i >= 0; i-- {
		val := list.RemoveLast()
		intVal, _ := val.(int)
		if intVal != i {
			t.Error("add test fail: expected " + strconv.Itoa(i) + ", actual: " + strconv.Itoa(intVal))
		}
	}
}

func TestRange(t *testing.T) {
	list := Make()
	size := 10
	for i := 0; i < size; i++ {
		list.Add(i)
	}
	for start := 0; start < size; start++ {
		for stop := start; stop < size; stop++ {
			slice := list.Range(start, stop)
			if len(slice) != stop-start {
				t.Error("expected " + strconv.Itoa(stop-start) + ", get: " + strconv.Itoa(len(slice)) +
					", range: [" + strconv.Itoa(start) + "," + strconv.Itoa(stop) + "]")
			}
			sliceIndex := 0
			for i := start; i < stop; i++ {
				val := slice[sliceIndex]
				intVal, _ := val.(int)
				if intVal != i {
					t.Error("expected " + strconv.Itoa(i) + ", get: " + strconv.Itoa(intVal) +
						", range: [" + strconv.Itoa(start) + "," + strconv.Itoa(stop) + "]")
				}
				sliceIndex++
			}
		}
	}
}