package factories

import (
	"errors"
	"sync"

	instancemanager "git.acooldomain.co/server-manager/backend/instancemanager"
	"git.acooldomain.co/server-manager/backend/instancemanager/docker"
	"git.acooldomain.co/server-manager/backend/models"
)

var (
	instanceManagerHandlers = make(map[string]instancemanager.InstanceManager)
	instanceManagerMutex    sync.Mutex
)

func getDockerCacheKey(config *models.DockerInstanceManagerConfig, siteDomain string) string {
	return "Docker/" + siteDomain
}

func GetInstanceManager(config models.InstanceManagerConfig, siteDomain string) (instancemanager.InstanceManager, error) {
	var key string
	var handler instancemanager.InstanceManager
	var err error
	var exists bool

	switch config.Type {
	case models.DOCKER:
		if config.Docker == nil {
			return nil, errors.New("missing Docker configuration")
		}
		key = getDockerCacheKey(config.Docker, siteDomain)
	default:
		return nil, errors.New("unsupported database type")
	}

	instanceManagerMutex.Lock()
	defer instanceManagerMutex.Unlock()

	if handler, exists = instanceManagerHandlers[key]; exists {
		return handler, nil
	}

	switch config.Type {
	case models.DOCKER:
		handler, err = docker.NewInstanceManager(*config.Docker, siteDomain)
		if err != nil {
			return nil, err
		}
	default:
		return nil, errors.New("unsupported database type")
	}

	instanceManagerHandlers[key] = handler
	return handler, nil
}