package services

import (
	"log"
	"os"

	"github.com/franela/play-with-docker/types"
)

var instances map[string]map[string]*types.Instance

var dindImage string
var defaultDindImageName string

func init() {
	instances = make(map[string]map[string]*types.Instance)
        dindImage = getDindImageName()
}

func getDindImageName() string {
	dindImage := os.Getenv("DIND_IMAGE")
        defaultDindImageName = "docker:1.12.2-rc2-dind"
        if len(dindImage) == 0 {
		dindImage = defaultDindImageName
	}
	return dindImage
}

func NewInstance(session *types.Session) (*types.Instance, error) {

	//TODO: Validate that a session can only have 5 instances
	//TODO: Create in redis
	log.Printf("NewInstance - using image: [%s]\n", dindImage)
	instance, err := CreateInstance(session.Id, dindImage)

	if err != nil {
		return nil, err
	}

	if instances[session.Id] == nil {
		instances[session.Id] = make(map[string]*types.Instance)
	}
	instances[session.Id][instance.Name] = instance

	return instance, nil
}

func GetInstance(session *types.Session, instanceId string) *types.Instance {
	//TODO: Use redis
	i := instances[session.Id][instanceId]
	return i
}
func DeleteInstance(session *types.Session, instance *types.Instance) error {
	//TODO: Use redis
	delete(instances[session.Id], instance.Name)
	return DeleteContainer(instance.Name)
}