package main

import (
	"testing"
)

func TestParseString(t *testing.T) {
	input := "00.23"
	fs := parseString(input)
	if ret := fs.String(); ret != input {
		t.Errorf("Expected %s received %s", input, ret)
	}
}

func TestDefragmentize1(t *testing.T) {
	fs := parseString("00..11")
	fs.OptimizeDiskFragmentation()
	expt := "0011.."
	if ret := fs.String(); ret != expt {
		t.Errorf("Expected %s received %s", expt, ret)
	}
}

func TestDefragmentize2(t *testing.T) {
	fs := parseString("00.112")
	fs.OptimizeDiskFragmentation()
	expt := "00211."
	if ret := fs.String(); ret != expt {
		t.Errorf("Expected %s received %s", expt, ret)
	}
}

func TestDefragmentize3(t *testing.T) {
	fs := parseString("00...112.")
	fs.OptimizeDiskFragmentation()
	expt := "00211...."
	if ret := fs.String(); ret != expt {
		t.Errorf("Expected %s received %s", expt, ret)
	}
}

func TestDefragmentize4(t *testing.T) {
	fs := parseString("00...111...2...333.44.5555.6666.777.888899")
	fs.OptimizeDiskFragmentation()
	expt := "0099811188827773336446555566.............."
	if ret := fs.String(); ret != expt {
		t.Errorf("Expected %s received %s", expt, ret)
	}
}

func TestFilterInPlace(t *testing.T) {
	dll := NewDLL[int]()
	dll.InsertFirst(4)
	dll.InsertFirst(3)
	dll.InsertFirst(2)
	dll.InsertFirst(1)
	dll.FilterInPlace(func(x int) bool { return x%2 == 0 })
}

func TestGroupByInPlace(t *testing.T) {
	dll := NewDLL[int]()
	dll.InsertFirst(4)
	dll.InsertFirst(6)
	dll.InsertFirst(3)
	dll.InsertFirst(5)
	dll.InsertFirst(2)
	dll.GroupByInPlace(func(x, y int) (int, bool) {
		if x%2 != y%2 {
			return 0, false
		}
		return x + y, true
	})
}