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|
package admin
import (
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"sync"
"time"
)
type ExtraFile struct {
FilePath string `json:"file_path"`
OldContent []byte `json:"-"`
NewContent []byte `json:"-"`
}
type ChangeDesc struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent []byte `json:"old_content"`
NewContent []byte `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
ExtraFiles []ExtraFile `json:"extra_files,omitempty"`
}
func (c ChangeDesc) ShortDesc() string {
switch {
case c.IsCreate:
return fmt.Sprintf("Created %s", filepath.Base(c.FilePath))
case c.IsDelete:
return fmt.Sprintf("Deleted %s", filepath.Base(c.FilePath))
case c.NewFilePath != "":
return fmt.Sprintf("Moved %s", filepath.Base(c.NewFilePath))
default:
return fmt.Sprintf("Edited %s", filepath.Base(c.FilePath))
}
}
type UndoInfo struct {
CanUndo bool `json:"can_undo"`
CanRedo bool `json:"can_redo"`
UndoDesc string `json:"undo_desc"`
RedoDesc string `json:"redo_desc"`
StackSize int `json:"stack_size"`
RedoSize int `json:"redo_size"`
}
type UndoStack struct {
mu sync.Mutex
dataDir string
history []ChangeDesc
redo []ChangeDesc
maxSize int
filePath string
}
func NewUndoStack(dataDir string) *UndoStack {
us := &UndoStack{
dataDir: dataDir,
maxSize: 100,
filePath: filepath.Join(dataDir, ".admin_history.json"),
}
us.load()
us.redo = nil
return us
}
func (us *UndoStack) Push(desc ChangeDesc) {
us.mu.Lock()
defer us.mu.Unlock()
desc.Time = time.Now().Format(time.RFC3339)
us.history = append(us.history, desc)
us.redo = nil
if len(us.history) > us.maxSize {
us.history = us.history[len(us.history)-us.maxSize:]
}
us.save()
log.Printf("undo: push %s", desc.ShortDesc())
}
func (us *UndoStack) Undo() *ChangeDesc {
us.mu.Lock()
defer us.mu.Unlock()
if len(us.history) == 0 {
return nil
}
last := us.history[len(us.history)-1]
if err := us.applyUndo(last); err != nil {
log.Printf("undo: failed %s: %v", last.ShortDesc(), err)
return nil
}
us.history = us.history[:len(us.history)-1]
us.redo = append(us.redo, last)
us.save()
log.Printf("undo: undid %s", last.ShortDesc())
return &last
}
func (us *UndoStack) Redo() *ChangeDesc {
us.mu.Lock()
defer us.mu.Unlock()
if len(us.redo) == 0 {
return nil
}
last := us.redo[len(us.redo)-1]
if err := us.applyRedo(last); err != nil {
log.Printf("redo: failed %s: %v", last.ShortDesc(), err)
return nil
}
us.redo = us.redo[:len(us.redo)-1]
us.history = append(us.history, last)
us.save()
log.Printf("redo: redid %s", last.ShortDesc())
return &last
}
func (us *UndoStack) applyUndo(c ChangeDesc) error {
if c.NewFilePath != "" {
os.Remove(c.NewFilePath)
}
if c.IsDelete {
if c.OldContent == nil {
os.MkdirAll(c.FilePath, 0755)
} else {
os.MkdirAll(filepath.Dir(c.FilePath), 0755)
if err := os.WriteFile(c.FilePath, c.OldContent, 0644); err != nil {
return fmt.Errorf("restore deleted %s: %w", c.FilePath, err)
}
}
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.OldContent, 0644)
}
} else if c.IsCreate {
os.Remove(c.FilePath)
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.OldContent, 0644)
}
} else {
target := c.FilePath
content := c.OldContent
if c.NewFilePath != "" {
target = c.FilePath
}
os.MkdirAll(filepath.Dir(target), 0755)
if err := os.WriteFile(target, content, 0644); err != nil {
return fmt.Errorf("revert %s: %w", target, err)
}
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.OldContent, 0644)
}
}
return nil
}
func (us *UndoStack) applyRedo(c ChangeDesc) error {
if c.NewFilePath != "" {
os.Remove(c.FilePath)
}
if c.IsCreate {
target := c.FilePath
if c.NewFilePath != "" {
target = c.NewFilePath
}
os.MkdirAll(filepath.Dir(target), 0755)
if err := os.WriteFile(target, c.NewContent, 0644); err != nil {
return fmt.Errorf("recreate %s: %w", target, err)
}
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.NewContent, 0644)
}
} else if c.IsDelete {
os.Remove(c.FilePath)
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.NewContent, 0644)
}
} else {
target := c.FilePath
content := c.NewContent
if c.NewFilePath != "" {
target = c.NewFilePath
}
os.MkdirAll(filepath.Dir(target), 0755)
if err := os.WriteFile(target, content, 0644); err != nil {
return fmt.Errorf("reapply %s: %w", target, err)
}
for _, ef := range c.ExtraFiles {
os.MkdirAll(filepath.Dir(ef.FilePath), 0755)
os.WriteFile(ef.FilePath, ef.NewContent, 0644)
}
}
return nil
}
func (us *UndoStack) Info() UndoInfo {
us.mu.Lock()
defer us.mu.Unlock()
info := UndoInfo{
StackSize: len(us.history),
RedoSize: len(us.redo),
}
if len(us.history) > 0 {
info.CanUndo = true
info.UndoDesc = us.history[len(us.history)-1].ShortDesc()
}
if len(us.redo) > 0 {
info.CanRedo = true
info.RedoDesc = us.redo[len(us.redo)-1].ShortDesc()
}
return info
}
func (us *UndoStack) save() {
type extraEntry struct {
FilePath string `json:"file_path"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
}
type entry struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
ExtraFiles []extraEntry `json:"extra_files,omitempty"`
}
type saveData struct {
History []entry `json:"history"`
Redo []entry `json:"redo"`
}
toEntries := func(changes []ChangeDesc) []entry {
var entries []entry
for _, c := range changes {
var extra []extraEntry
for _, ef := range c.ExtraFiles {
extra = append(extra, extraEntry{
FilePath: ef.FilePath,
OldContent: string(ef.OldContent),
NewContent: string(ef.NewContent),
})
}
entries = append(entries, entry{
Time: c.Time,
Description: c.Description,
FilePath: c.FilePath,
NewFilePath: c.NewFilePath,
OldContent: string(c.OldContent),
NewContent: string(c.NewContent),
IsDelete: c.IsDelete,
IsCreate: c.IsCreate,
ExtraFiles: extra,
})
}
return entries
}
data := saveData{
History: toEntries(us.history),
Redo: toEntries(us.redo),
}
b, err := json.Marshal(data)
if err != nil {
log.Printf("undo: failed to marshal history: %v", err)
return
}
if err := os.WriteFile(us.filePath, b, 0644); err != nil {
log.Printf("undo: failed to write history file: %v", err)
}
}
func (us *UndoStack) load() {
data, err := os.ReadFile(us.filePath)
if err != nil {
return
}
log.Printf("undo: loaded history from %s", us.filePath)
type extraEntry struct {
FilePath string `json:"file_path"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
}
type entry struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
ExtraFiles []extraEntry `json:"extra_files,omitempty"`
}
var saveData struct {
History []entry `json:"history"`
Redo []entry `json:"redo"`
}
if err := json.Unmarshal(data, &saveData); err != nil {
log.Printf("undo: failed to unmarshal history: %v", err)
return
}
fromEntries := func(entries []entry) []ChangeDesc {
var changes []ChangeDesc
for _, e := range entries {
var extra []ExtraFile
for _, ef := range e.ExtraFiles {
extra = append(extra, ExtraFile{
FilePath: ef.FilePath,
OldContent: []byte(ef.OldContent),
NewContent: []byte(ef.NewContent),
})
}
changes = append(changes, ChangeDesc{
Time: e.Time,
Description: e.Description,
FilePath: e.FilePath,
NewFilePath: e.NewFilePath,
OldContent: []byte(e.OldContent),
NewContent: []byte(e.NewContent),
IsDelete: e.IsDelete,
IsCreate: e.IsCreate,
ExtraFiles: extra,
})
}
return changes
}
us.history = fromEntries(saveData.History)
log.Printf("undo: loaded %d history entries", len(us.history))
}
func (us *UndoStack) Clear() {
us.mu.Lock()
defer us.mu.Unlock()
us.history = nil
us.redo = nil
os.Remove(us.filePath)
log.Printf("undo: cleared history")
}
|
