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package main
import (
"errors"
"time"
)
type Database interface {
GetTracking() (*Entry, error)
GetEntries() ([]*Entry, error)
QueryEntry(id *int, date *Date) ([]*Entry, error)
StartNewEntry(now time.Time, task *Entry) (*Entry, error)
StopEntry(now time.Time) error
SaveEntry(task *Entry) (*Entry, error)
GetTasks() ([]*Task, error)
QueryTask(id *int, group *string, ident *string) ([]*Task, error)
SaveTask(task *Task) (*Task, error)
}
type InMemDb struct {
entries []*Entry
current *Entry
tasks []*Task
}
var (
ErrNotFound = errors.New("Not found")
ErrNotRunning = errors.New("Not running")
)
func NewInMemDb() Database {
return &InMemDb{
entries: []*Entry{},
current: nil,
}
}
func (db *InMemDb) GetTracking() (*Entry, error) {
return db.current, nil
}
func (db *InMemDb) GetEntries() ([]*Entry, error) {
res := make([]*Entry, 0, len(db.entries))
for _, task := range db.entries {
res = append(res, task)
}
return res, nil
}
func (db *InMemDb) QueryEntry(id *int, date *Date) ([]*Entry, error) {
res := make([]*Entry, 0, 1)
for _, entry := range db.entries {
if id != nil && entry.Id != *id {
continue
}
if date != nil && entry.Date != *date {
continue
}
res = append(res, entry)
}
return res, nil
}
func (db *InMemDb) StartNewEntry(now time.Time, task *Entry) (*Entry, error) {
newTask := &Entry{
Id: len(db.entries),
From: task.From,
To: nil,
Date: DateFromStd(now),
Tag: task.Tag,
Comment: task.Comment,
}
if newTask.From == nil {
from := TimeFromStd(now)
newTask.From = &from
}
db.entries = append(db.entries, newTask)
db.StopEntry(now)
db.current = newTask
return newTask, nil
}
func (db *InMemDb) StopEntry(now time.Time) error {
if db.current != nil {
to := TimeFromStd(now)
db.current.To = &to
db.current = nil
} else {
return ErrNotRunning
}
return nil
}
func (db *InMemDb) SaveEntry(entry *Entry) (*Entry, error) {
if entry.Id < 0 || entry.Id >= len(db.entries) {
copyTask := *entry
copyTask.Id = len(db.entries)
db.entries = append(db.entries, ©Task)
return ©Task, nil
}
existent := db.entries[entry.Id]
existent.Comment = entry.Comment
existent.Tag = entry.Tag
existent.From = entry.From
existent.To = entry.To
existent.Date = entry.Date
return existent, nil
}
func (db *InMemDb) GetTasks() ([]*Task, error) {
res := make([]*Task, 0, len(db.tasks))
for _, task := range db.tasks {
res = append(res, task)
}
return res, nil
}
func (db *InMemDb) QueryTask(id *int, group *string, ident *string) ([]*Task, error) {
res := make([]*Task, 0, 1)
for _, task := range db.tasks {
if id != nil && task.Id != *id {
continue
}
if group != nil && task.Group != group {
continue
}
if ident != nil && task.Ident != ident {
continue
}
res = append(res, task)
}
return res, nil
}
func (db *InMemDb) SaveTask(task *Task) (newTask *Task, err error) {
var tasks []*Task
tasks, err = db.QueryTask(&task.Id, nil, nil)
if err != nil {
return
}
if len(tasks) > 0 {
newTask = tasks[0]
newTask.Text = task.Text
newTask.Group = task.Group
newTask.Ident = task.Ident
} else {
taskCopy := *task
taskCopy.Id = len(db.tasks)
db.tasks = append(db.tasks, &taskCopy)
newTask = &taskCopy
}
return
}
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