package update

import (
	domain "RenewCMS/internal/domain/update"
	"encoding/json"
	"os"
	"sync"
)

type JSONRunningInfoStore struct {
	path string
	mu   sync.Mutex
}

var _ domain.RunningInfoStore = &JSONRunningInfoStore{}

func NewJSONRunningInfoStore(path string) *JSONRunningInfoStore {
	return &JSONRunningInfoStore{path: path}
}

func (s *JSONRunningInfoStore) Write(info domain.RunningInfo) error {
	s.mu.Lock()
	defer s.mu.Unlock()

	return writeJSONAtomically(s.path, info, readableFilePermissions)
}

func (s *JSONRunningInfoStore) Read() (domain.RunningInfo, bool) {
	s.mu.Lock()
	defer s.mu.Unlock()

	linkInfo, err := os.Lstat(s.path)
	if err != nil || !linkInfo.Mode().IsRegular() {
		return domain.RunningInfo{}, false
	}
	content, err := os.ReadFile(s.path)
	if err != nil {
		return domain.RunningInfo{}, false
	}
	var info domain.RunningInfo
	if err := json.Unmarshal(content, &info); err != nil || info.Version == "" || info.Pid == 0 {
		return domain.RunningInfo{}, false
	}
	return info, true
}