package cmd

import (
	"bufio"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"os"

	"github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/client"
	"github.com/docker/go-connections/nat"
	"github.com/kubeshark/kubeshark/config"
	"github.com/kubeshark/kubeshark/docker"
	"github.com/kubeshark/kubeshark/internal/connect"
	"github.com/kubeshark/kubeshark/kubernetes"
	"github.com/kubeshark/kubeshark/misc"
	"github.com/kubeshark/kubeshark/utils"
	"github.com/rs/zerolog/log"
	v1 "k8s.io/api/core/v1"
)

func logPullingImage(image string, reader io.ReadCloser) {
	scanner := bufio.NewScanner(reader)
	for scanner.Scan() {
		text := scanner.Text()
		var data map[string]interface{}
		if err := json.Unmarshal([]byte(text), &data); err != nil {
			log.Error().Err(err).Send()
			continue
		}

		var id string
		if val, ok := data["id"]; ok {
			id = val.(string)
		}

		var status string
		if val, ok := data["status"]; ok {
			status = val.(string)
		}

		var progress string
		if val, ok := data["progress"]; ok {
			progress = val.(string)
		}

		e := log.Info()
		if image != "" {
			e = e.Str("image", image)
		}

		if progress != "" {
			e = e.Str("progress", progress)
		}

		e.Msg(fmt.Sprintf("[%-12s] %-18s", id, status))
	}
}

func pullImages(ctx context.Context, cli *client.Client, imageFront string, imageHub string, imageWorker string) error {
	readerFront, err := cli.ImagePull(ctx, imageFront, types.ImagePullOptions{})
	if err != nil {
		return err
	}
	defer readerFront.Close()
	logPullingImage(imageFront, readerFront)

	readerHub, err := cli.ImagePull(ctx, imageHub, types.ImagePullOptions{})
	if err != nil {
		return err
	}
	defer readerHub.Close()
	logPullingImage(imageHub, readerHub)

	readerWorker, err := cli.ImagePull(ctx, imageWorker, types.ImagePullOptions{})
	if err != nil {
		return err
	}
	defer readerWorker.Close()
	logPullingImage(imageWorker, readerWorker)

	return nil
}

func cleanUpOldContainers(
	ctx context.Context,
	cli *client.Client,
	nameFront string,
	nameHub string,
	nameWorker string,
) error {
	containers, err := cli.ContainerList(ctx, types.ContainerListOptions{})
	if err != nil {
		return err
	}

	for _, container := range containers {
		f := fmt.Sprintf("/%s", nameFront)
		h := fmt.Sprintf("/%s", nameHub)
		w := fmt.Sprintf("/%s", nameWorker)
		if utils.Contains(container.Names, f) || utils.Contains(container.Names, h) || utils.Contains(container.Names, w) {
			err = cli.ContainerRemove(ctx, container.ID, types.ContainerRemoveOptions{Force: true})
			if err != nil {
				return err
			}
		}
	}

	return nil
}

func createAndStartContainers(
	ctx context.Context,
	cli *client.Client,
	imageFront string,
	imageHub string,
	imageWorker string,
	tarReader io.Reader,
) (
	respFront container.ContainerCreateCreatedBody,
	respHub container.ContainerCreateCreatedBody,
	respWorker container.ContainerCreateCreatedBody,
	workerIPAddr string,
	err error,
) {
	log.Info().Msg("Creating containers...")

	nameFront := fmt.Sprintf("%s-front", misc.Program)
	nameHub := fmt.Sprintf("%s-hub", misc.Program)
	nameWorker := fmt.Sprintf("%s-worker", misc.Program)

	err = cleanUpOldContainers(ctx, cli, nameFront, nameHub, nameWorker)
	if err != nil {
		return
	}

	hostIP := "0.0.0.0"

	hostConfigFront := &container.HostConfig{
		PortBindings: nat.PortMap{
			nat.Port(fmt.Sprintf("%d/tcp", config.Config.Tap.Proxy.Front.DstPort)): []nat.PortBinding{
				{
					HostIP:   hostIP,
					HostPort: fmt.Sprintf("%d", config.Config.Tap.Proxy.Front.SrcPort),
				},
			},
		},
	}

	respFront, err = cli.ContainerCreate(ctx, &container.Config{
		Image: imageFront,
		Tty:   false,
		Env: []string{
			"REACT_APP_DEFAULT_FILTER= ",
			"REACT_APP_HUB_HOST= ",
			fmt.Sprintf("REACT_APP_HUB_PORT=%d", config.Config.Tap.Proxy.Hub.SrcPort),
		},
	}, hostConfigFront, nil, nil, nameFront)
	if err != nil {
		return
	}

	hostConfigHub := &container.HostConfig{
		PortBindings: nat.PortMap{
			nat.Port(fmt.Sprintf("%d/tcp", config.Config.Tap.Proxy.Hub.DstPort)): []nat.PortBinding{
				{
					HostIP:   hostIP,
					HostPort: fmt.Sprintf("%d", config.Config.Tap.Proxy.Hub.SrcPort),
				},
			},
		},
	}

	cmdHub := []string{"-port", fmt.Sprintf("%d", config.Config.Tap.Proxy.Hub.DstPort)}
	if config.DebugMode {
		cmdHub = append(cmdHub, fmt.Sprintf("-%s", config.DebugFlag))
	}

	respHub, err = cli.ContainerCreate(ctx, &container.Config{
		Image:        imageHub,
		Cmd:          cmdHub,
		Tty:          false,
		ExposedPorts: nat.PortSet{nat.Port(fmt.Sprintf("%d/tcp", config.Config.Tap.Proxy.Hub.DstPort)): {}},
	}, hostConfigHub, nil, nil, nameHub)
	if err != nil {
		return
	}

	cmdWorker := []string{"-f", "./import", "-port", fmt.Sprintf("%d", config.Config.Tap.Proxy.Worker.DstPort)}
	if config.DebugMode {
		cmdWorker = append(cmdWorker, fmt.Sprintf("-%s", config.DebugFlag))
	}

	respWorker, err = cli.ContainerCreate(ctx, &container.Config{
		Image: imageWorker,
		Cmd:   cmdWorker,
		Tty:   false,
	}, nil, nil, nil, nameWorker)
	if err != nil {
		return
	}

	if err = cli.CopyToContainer(ctx, respWorker.ID, "/app/import", tarReader, types.CopyToContainerOptions{}); err != nil {
		return
	}

	log.Info().Msg("Starting containers...")

	if err = cli.ContainerStart(ctx, respFront.ID, types.ContainerStartOptions{}); err != nil {
		return
	}

	if err = cli.ContainerStart(ctx, respHub.ID, types.ContainerStartOptions{}); err != nil {
		return
	}

	if err = cli.ContainerStart(ctx, respWorker.ID, types.ContainerStartOptions{}); err != nil {
		return
	}

	var containerWorker types.ContainerJSON
	containerWorker, err = cli.ContainerInspect(ctx, respWorker.ID)
	if err != nil {
		return
	}

	workerIPAddr = containerWorker.NetworkSettings.IPAddress

	return
}

func stopAndRemoveContainers(
	ctx context.Context,
	cli *client.Client,
	respFront container.ContainerCreateCreatedBody,
	respHub container.ContainerCreateCreatedBody,
	respWorker container.ContainerCreateCreatedBody,
) (err error) {
	log.Warn().Msg("Stopping containers...")
	err = cli.ContainerStop(ctx, respFront.ID, nil)
	if err != nil {
		return
	}
	err = cli.ContainerStop(ctx, respHub.ID, nil)
	if err != nil {
		return
	}
	err = cli.ContainerStop(ctx, respWorker.ID, nil)
	if err != nil {
		return
	}

	log.Warn().Msg("Removing containers...")
	err = cli.ContainerRemove(ctx, respFront.ID, types.ContainerRemoveOptions{})
	if err != nil {
		return
	}
	err = cli.ContainerRemove(ctx, respHub.ID, types.ContainerRemoveOptions{})
	if err != nil {
		return
	}
	err = cli.ContainerRemove(ctx, respWorker.ID, types.ContainerRemoveOptions{})
	if err != nil {
		return
	}

	return
}

func pcap(tarPath string) {
	docker.SetRegistry(config.Config.Tap.Docker.Registry)
	docker.SetTag(config.Config.Tap.Docker.Tag)

	ctx := context.Background()
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		log.Error().Err(err).Send()
		return
	}
	defer cli.Close()

	imageFront := docker.GetFrontImage()
	imageHub := docker.GetHubImage()
	imageWorker := docker.GetWorkerImage()

	err = pullImages(ctx, cli, imageFront, imageHub, imageWorker)
	if err != nil {
		log.Error().Err(err).Send()
		return
	}

	tarFile, err := os.Open(tarPath)
	if err != nil {
		log.Error().Err(err).Send()
		return
	}
	defer tarFile.Close()
	tarReader := bufio.NewReader(tarFile)

	respFront, respHub, respWorker, workerIPAddr, err := createAndStartContainers(
		ctx,
		cli,
		imageFront,
		imageHub,
		imageWorker,
		tarReader,
	)
	if err != nil {
		log.Error().Err(err).Send()
		return
	}

	workerPod := &v1.Pod{
		Spec: v1.PodSpec{
			NodeName: "docker",
		},
		Status: v1.PodStatus{
			PodIP: workerIPAddr,
			Phase: v1.PodRunning,
			ContainerStatuses: []v1.ContainerStatus{
				{
					Ready: true,
				},
			},
		},
	}

	connector = connect.NewConnector(kubernetes.GetLocalhostOnPort(config.Config.Tap.Proxy.Hub.SrcPort), connect.DefaultRetries, connect.DefaultTimeout)
	connector.PostWorkerPodToHub(workerPod)

	log.Info().
		Str("url", kubernetes.GetLocalhostOnPort(config.Config.Tap.Proxy.Hub.SrcPort)).
		Msg(fmt.Sprintf(utils.Green, "Hub is available at:"))

	url := kubernetes.GetLocalhostOnPort(config.Config.Tap.Proxy.Front.SrcPort)
	log.Info().Str("url", url).Msg(fmt.Sprintf(utils.Green, fmt.Sprintf("%s is available at:", misc.Software)))

	if !config.Config.HeadlessMode {
		utils.OpenBrowser(url)
	}

	ctxC, cancel := context.WithCancel(context.Background())
	defer cancel()
	utils.WaitForTermination(ctxC, cancel)

	err = stopAndRemoveContainers(ctx, cli, respFront, respHub, respWorker)
	if err != nil {
		log.Error().Err(err).Send()
	}
}