package main

import (
	"context"
	"github.com/docker/docker/client"
	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/api/types"
	"fmt"
	"time"
)

type ChallengeContainer struct {
	Challenge *Challenge
	ContainerID string
	IP string
}

var (
	dockerCtx context.Context
	dockerCli *client.Client
)

// Starts the container and returns its address and containerID if successful
func (cc ChallengeContainer) startContainer() (address string, containerID string, err error) {
	// Set up our context if there is none already set up
	if dockerCtx == nil {
		dockerCtx = context.Background()
	}

	// Set up our Docker CLI connection if there is not already one
	if dockerCli == nil {
		dockerCli, err = client.NewEnvClient()

		if err != nil {
			return "", "", err
		}
	}

	// Create container
	resp, err := dockerCli.ContainerCreate(dockerCtx, &container.Config{
		Image: cc.Challenge.Container,
		Env: []string{fmt.Sprintf("FLAG=%s", cc.Challenge.Flag)},
		Tty: false,
	}, nil, nil, "")

	if err != nil {
		return "", "", err
	}

	// Start container
	err = dockerCli.ContainerStart(dockerCtx, resp.ID, types.ContainerStartOptions{})
	if err != nil {
		return "", "", err
	}

	// Get IP Address of that container
	inspectJSON, err := dockerCli.ContainerInspect(dockerCtx, resp.ID)
	if err != nil {
		return "", "", err
	}

	// Return IP, Container ID and error
	return inspectJSON.NetworkSettings.IPAddress, resp.ID,nil
}

// Stops the container with a timeout of one second
func (cc ChallengeContainer) stopContainer() {
	timeout := time.Second
	dockerCli.ContainerStop(dockerCtx, cc.ContainerID, &timeout)
}