package update

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

type JSONRestartRequestStore struct {
	path string
	mu   sync.Mutex
}

var _ domain.RestartRequestStore = &JSONRestartRequestStore{}

func NewJSONRestartRequestStore(path string) *JSONRestartRequestStore {
	return &JSONRestartRequestStore{path: path}
}

func (s *JSONRestartRequestStore) Write(request domain.RestartRequest) error {
	s.mu.Lock()
	defer s.mu.Unlock()

	return writeJSONAtomically(s.path, request, statusFilePermissions)
}

func (s *JSONRestartRequestStore) Read() (domain.RestartRequest, error) {
	s.mu.Lock()
	defer s.mu.Unlock()

	info, err := os.Lstat(s.path)
	if errors.Is(err, fs.ErrNotExist) || (err == nil && info.IsDir()) {
		return domain.RestartRequest{}, domain.ErrNoRestartRequest
	}
	if err != nil {
		return domain.RestartRequest{}, err
	}
	content, err := os.ReadFile(s.path)
	if err != nil {
		return domain.RestartRequest{}, err
	}
	var request domain.RestartRequest
	return request, json.Unmarshal(content, &request)
}

func (s *JSONRestartRequestStore) Delete() error {
	s.mu.Lock()
	defer s.mu.Unlock()

	return removeIfPresent(s.path)
}