package update

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

type JSONResultStore struct {
	path string
	mu   sync.Mutex
}

var _ domain.ResultStore = &JSONResultStore{}

func NewJSONResultStore(path string) *JSONResultStore {
	return &JSONResultStore{path: path}
}

func (s *JSONResultStore) Read() (domain.Result, bool) {
	s.mu.Lock()
	defer s.mu.Unlock()

	content, err := os.ReadFile(s.path)
	if err != nil {
		return domain.Result{}, false
	}
	return decodeResult(content)
}

func (s *JSONResultStore) Write(result domain.Result) error {
	s.mu.Lock()
	defer s.mu.Unlock()

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

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

	return removeIfPresent(s.path)
}

func decodeResult(content []byte) (domain.Result, bool) {
	var result domain.Result
	if err := json.Unmarshal(content, &result); err != nil || !result.IsKnown() {
		return domain.Result{}, false
	}
	return result, true
}