package setup

import (
	"encoding/json"
	"sync"
	"time"

	"github.com/TeaOSLab/EdgeAPI/internal/db/models"
	"github.com/TeaOSLab/EdgeCommon/pkg/systemconfigs"
)

var (
	sharedUpgradeConfig     *systemconfigs.UpgradeConfig
	sharedUpgradeConfigTime time.Time
	sharedUpgradeConfigMu   sync.Mutex
)

const upgradeConfigTTL = 5 * time.Minute

// LoadUpgradeConfig 读取升级配置（带5分钟内存缓存）
func LoadUpgradeConfig() (*systemconfigs.UpgradeConfig, error) {
	sharedUpgradeConfigMu.Lock()
	defer sharedUpgradeConfigMu.Unlock()

	if sharedUpgradeConfig != nil && time.Since(sharedUpgradeConfigTime) < upgradeConfigTTL {
		return sharedUpgradeConfig, nil
	}

	valueJSON, err := models.SharedSysSettingDAO.ReadSetting(nil, systemconfigs.SettingCodeUpgradeConfig)
	if err != nil {
		return nil, err
	}

	config := systemconfigs.NewUpgradeConfig()
	if len(valueJSON) > 0 {
		err = json.Unmarshal(valueJSON, config)
		if err != nil {
			return config, nil
		}
	}

	sharedUpgradeConfig = config
	sharedUpgradeConfigTime = time.Now()
	return config, nil
}