1package bug
  2
  3import (
  4	"github.com/kevinburke/go.uuid"
  5)
  6
  7// Bug hold the data of a bug thread, organized in a way close to
  8// how it will be persisted inside Git. This is the datastructure
  9// used for merge of two different version.
 10type Bug struct {
 11	// Id used as unique identifier
 12	Id uuid.UUID
 13
 14	// TODO: need a way to order bugs
 15	// Probably a Lamport clock
 16
 17	Packs []OperationPack
 18
 19	Staging OperationPack
 20}
 21
 22// Create a new Bug
 23func NewBug() (*Bug, error) {
 24
 25	// Creating UUID Version 4
 26	id, err := uuid.ID4()
 27
 28	if err != nil {
 29		return nil, err
 30	}
 31
 32	return &Bug{
 33		Id: id,
 34	}, nil
 35}
 36
 37// IsValid check if the Bug data is valid
 38func (bug *Bug) IsValid() bool {
 39	// non-empty
 40	if len(bug.Packs) == 0 && bug.Staging.IsEmpty() {
 41		return false
 42	}
 43
 44	// check if each pack is valid
 45	for _, pack := range bug.Packs {
 46		if !pack.IsValid() {
 47			return false
 48		}
 49	}
 50
 51	// check if Staging is valid if needed
 52	if !bug.Staging.IsEmpty() {
 53		if !bug.Staging.IsValid() {
 54			return false
 55		}
 56	}
 57
 58	// The very first Op should be a CREATE
 59	firstOp := bug.firstOp()
 60	if firstOp == nil || firstOp.OpType() != CREATE {
 61		return false
 62	}
 63
 64	// Check that there is no more CREATE op
 65	it := NewOperationIterator(bug)
 66	createCount := 0
 67	for it.Next() {
 68		if it.Value().OpType() == CREATE {
 69			createCount++
 70		}
 71	}
 72
 73	if createCount != 1 {
 74		return false
 75	}
 76
 77	return true
 78}
 79
 80func (bug *Bug) Append(op Operation) {
 81	bug.Staging.Append(op)
 82}
 83
 84func (bug *Bug) Commit() {
 85	bug.Packs = append(bug.Packs, bug.Staging)
 86	bug.Staging = OperationPack{}
 87}
 88
 89func (bug *Bug) HumanId() string {
 90	return bug.Id.String()
 91}
 92
 93func (bug *Bug) firstOp() Operation {
 94	for _, pack := range bug.Packs {
 95		for _, op := range pack.Operations {
 96			return op
 97		}
 98	}
 99
100	if !bug.Staging.IsEmpty() {
101		return bug.Staging.Operations[0]
102	}
103
104	return nil
105}