// Package bits provides a bit vector interface and several implementations
package bits

import (
	"strconv"
)

// The Vector interface defines methods on the bit vector
type Vector interface {
	// Retrieves the bit at the designated position
	Peek(uint) bool
	// Sets the bit at the designated position
	Poke(uint, bool)
	// Flips the bit at the designated position
	Flip(uint)
	// Returns the total number of elements supported by the vector
	Len() uint
}

// A Vector type that simply stores booleans in a slice
type boolvector []bool

// Retrieves the bit at the designated position
func (v boolvector) Peek(pos uint) bool {
	return v[pos]
}

	v[pos] = !v[pos]
}

// Returns the total number of elements supported by the vector
func (v boolvector) Len() uint {
	return uint(len(v))
}

func NewBool(size uint) Vector {
	var slice []bool = make([]bool, size)
	return boolvector(slice)
}

type vector []uint

// Retrieves the bit at the designated position
func (v vector) Peek(pos uint) bool {
	var slot, offset uint = at(pos)
	return (v[slot] & (1 << offset)) > 0

}

func at(pos uint) (uint, uint) {
	return pos / strconv.IntSize, pos % strconv.IntSize
}

// Create a new bit vector sized up to the desired number of elements
func NewBit(size uint) Vector {
	var length uint = size / strconv.IntSize

	if size%strconv.IntSize > 0 {
		// Allocate one additional slot if the desired
		// size is does not divide by 32/64
		length++
	}

	var slice []uint = make([]uint, length)
	return vector(slice)
}

package bits

import (
	"strconv"
	"testing"
)


var sizes []uint = []uint{0, 31, 32, 33, 61, 63, 64, 127, 128, 129}

func TestBitSize(t *testing.T) {
	for _, size := range sizes {
		v := NewBit(size)
		if v.Len() < size || v.Len() > size+strconv.IntSize {
			t.Error("Invalid length", v.Len(), "expected", size)
		}
	}
}

func TestBitEmpty(t *testing.T) {
	var size uint = 128
	v := NewBit(size)

	// Check if it is empty by default
	for i := uint(0); i < size; i++ {
		if v.Peek(i) {
			t.Error("Invalid raised bit at", i)
		}
	}
}

func TestBitBasic(t *testing.T) {
	var size uint = 128
	v := NewBit(size)

	// Raise and lower each position explicitly
	for i := uint(0); i < size; i++ {
		v.Poke(i, true)
		if !v.Peek(i) {
			t.Error("Invalid lowered bit at", i)
		}

		v.Poke(i, false)
		if v.Peek(i) {
			t.Error("Invalid raised bit at", i)
		}
	}
}

func TestBitFlip(t *testing.T) {
	var size uint = 128
	v := NewBit(size)

	// Raise and lower each position by flipping
	for i := uint(0); i < size; i++ {
		v.Flip(i)
		if !v.Peek(i) {
			t.Error("Invalid lowered bit at", i)
		}

		v.Flip(i)
		if v.Peek(i) {
			t.Error("Invalid raised bit at", i)
		}
	}
}

func TestBoolSize(t *testing.T) {
	for _, size := range sizes {
		v := NewBool(size)
		if v.Len() != size {
			t.Error("Invalid length", v.Len(), "expected", size)
		}
	}
}

func TestBoolEmpty(t *testing.T) {
	var size uint = 128
	v := NewBool(size)

	// Check if it is empty by default
	for i := uint(0); i < size; i++ {
		if v.Peek(i) {
			t.Error("Invalid raised bit at", i)
		}
	}
}

func TestBoolBasic(t *testing.T) {
	var size uint = 128
	v := NewBool(size)

	// Raise and lower each position explicitly
	for i := uint(0); i < size; i++ {
		v.Poke(i, true)
		if !v.Peek(i) {
			t.Error("Invalid lowered bit at", i)
		}

		v.Poke(i, false)
		if v.Peek(i) {
			t.Error("Invalid raised bit at", i)
		}
	}
}

func TestBoolFlip(t *testing.T) {
	var size uint = 128
	v := NewBool(size)

	// Raise and lower each position by flipping
	for i := uint(0); i < size; i++ {
		v.Flip(i)
		if !v.Peek(i) {
			t.Error("Invalid lowered bit at", i)
		}

	var hd hashDiff
	hd.hash = fnv.New64a()
	hd.first = read(args[0], hd.hash)
	hd.second = read(args[1], hd.hash)

	var result diff.Delta = diff.Diff(&hd)





	gen := source(result)
	for have, added, mark := gen(); have; have, added, mark = gen() {
		var from []line = hd.line(!added)






		fmt.Println()
		for i := mark.From; i < mark.Length; i++ {
			fmt.Print(i)
			if added {
				fmt.Print(" > ")
			} else {
				fmt.Print(" < ")
			}
			fmt.Println(from[i].text)
		}
	}

}

// Returns a closure over the provided diff.Delta
// that returns diff.Mark entries while prioritizing removals when possible
func source(d diff.Delta) func() (bool, bool, diff.Mark) {
	var addedAt, removedAt int = 0, 0
	return func() (bool, bool, diff.Mark) {
		var addsOver bool = addedAt == len(d.Added)
		var removesOver bool = removedAt == len(d.Removed)

		var add, remove diff.Mark

// A line-based diff.Interface implementation
type hashDiff struct {
	first, second []line
	hash          hash.Hash64
}

// Required per diff.Interface
func (h *hashDiff) Equal(i, j int) bool {

	if h.first[i].hash != h.second[j].hash {
		return false
	} else {
		return h.first[i].text == h.second[j].text
	}
}

// Required per diff.Interface
func (h *hashDiff) Len() (int, int) {
	return len(h.first), len(h.second)
}

// A helper method for getting a line slice
func (h *hashDiff) line(first bool) []line {
	if first {
		return h.first
	}
	return h.second
}

// Holds a text line and its hash
type line struct {
	hash uint64
	text string
}

// Reads all lines in a file and returns a line entry for each
func read(name string, h hash.Hash64) []line {

	Removed []Mark
}

// Diffs the provided data and returns e Delta struct
// with added entries' indices in the second sequence and removed from the first
func Diff(data Interface) Delta {
	var len1, len2 = data.Len()
	var mat matrix = matrix{v: bits.NewBit(uint(len1 * len2)), lenX: len1, lenY: len2}

	for i := 0; i < len1; i++ {
		for j := 0; j < len2; j++ {
			mat.v.Poke(mat.at(i, j), data.Equal(i, j))
		}
	}

package diff

import (
	_ "0dev.org/bits"
	_ "fmt"
	"testing"
)

// A diff.Interface implementation for testing purposes
type diffSlice struct {
	first  []rune
	second []rune
}

// Required per diff.Interface
func (d diffSlice) Len() (int, int) {
	return len(d.first), len(d.second)
}

// Required per diff.Interface
func (d diffSlice) Equal(i, j int) bool {
	return d.first[i] == d.second[j]
}

func TestDiff(t *testing.T) {


	data := diffSlice{
		[]rune("abcdefgh"),
		[]rune("abbcedfh"),
	}

	result := Diff(data)
	if len(result.Added) != 2 ||
		result.Added[0].From != 2 || result.Added[0].Length != 3 ||
		result.Added[1].From != 5 || result.Added[1].Length != 6 ||
		result.Removed[0].From != 3 || result.Removed[0].Length != 4 ||
		result.Removed[1].From != 6 || result.Removed[1].Length != 7 {
		t.Error("Unexpected diff results", result)
	}


}

// func TestWTF(t *testing.T) {
// 	data := diffSlice{
// 		[]rune("abcdefgh"),
// 		[]rune("abbcedfh"),
// 	}


// 	var len1, len2 int = data.Len()
// 	var mat matrix = matrix{v: bits.NewBool(uint(len1 * len2)), lenX: len1, lenY: len2}

// 	for i := 0; i < len1; i++ {
// 		for j := 0; j < len2; j++ {
// 			mat.v.Poke(mat.at(i, j), data.Equal(i, j))


// 		}
// 	}

// 	debugPrint(box{5, 5, 6, 6}, mat) // visual debugging as its finest
// 	debugPrint(box{5, 5, 7, 7}, mat)
// 	debugPrint(box{5, 5, 8, 8}, mat) // ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.
// }


// func debugPrint(bounds box, mat matrix) {
// 	// Debug print
// 	fmt.Printf("-%d-%d--%d-%d--\n", bounds.x, bounds.y, bounds.lenX, bounds.lenY)
// 	for i := bounds.x; i < bounds.lenX; i++ {
// 		fmt.Print("| ")
// 		for j := bounds.y; j < bounds.lenY; j++ {
// 			//if vector.Peek(uint(j + (i * bounds.lenY))) {
// 			if mat.v.Peek(mat.at(i, j)) {
// 				fmt.Print("\\")
// 			} else {
// 				fmt.Print(".")


// 			}
// 		}
// 		fmt.Println(" |")

// 	}
// 	fmt.Println("------------")

// }