package docker

import (
	"context"
	"encoding/json"
	"fmt"
	"goseg/config"
	"goseg/structs"
	"log/slog"
	"os"

	"github.com/docker/docker/api/types"
	"github.com/docker/docker/client"
)

var (
	logger = slog.New(slog.NewJSONHandler(os.Stdout, nil))
)

func GetShipStatus(patps []string) (map[string]string, error) {
	statuses := make(map[string]string)
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		errmsg := fmt.Sprintf("Error getting Docker info: %v", err)
		logger.Error(errmsg)
		return statuses, err
	} else {
		containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{})
		if err != nil {
			errmsg := fmt.Sprintf("Error getting containers: %v", err)
			logger.Error(errmsg)
			return statuses, err
		} else {
			for _, pier := range patps {
				found := false
				for _, container := range containers {
					for _, name := range container.Names {
						fasPier := "/" + pier
						if name == fasPier {
							statuses[pier] = container.Status
							found = true
							break
						}
					}
					if found {
						break
					}
				}
				if !found {
					statuses[pier] = "not found"
				}
			}
		}
		return statuses, nil
	}
}

// return the name of a container's network
func GetContainerNetwork(name string) (string, error) {
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		return "", err
	}
	defer cli.Close()
	containerJSON, err := cli.ContainerInspect(context.Background(), name)
	if err != nil {
		return "", err
	}
	for networkName := range containerJSON.NetworkSettings.Networks {
		return networkName, nil
	}
	return "", fmt.Errorf("container is not attached to any network")
}

// return the disk and memory usage for a container
func GetContainerStats(containerName string) (structs.ContainerStats, error) {
	var res structs.ContainerStats
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		return res, err
	}
	defer cli.Close()
	statsResp, err := cli.ContainerStats(context.Background(), containerName, false)
	if err != nil {
		return res, err
	}
	defer statsResp.Body.Close()
	var stat types.StatsJSON
	if err := json.NewDecoder(statsResp.Body).Decode(&stat); err != nil {
		return res, err
	}
	memUsage := stat.MemoryStats.Usage
	inspectResp, err := cli.ContainerInspect(context.Background(), containerName)
	if err != nil {
		return res, err
	}
	diskUsage := int64(0)
	if inspectResp.SizeRw != nil {
		diskUsage = *inspectResp.SizeRw
	}
	return structs.ContainerStats{
		MemoryUsage: memUsage,
		DiskUsage:   diskUsage,
	}, nil
}

// start a container by name + tag
// not for booting new ships
func StartContainer(containerName, containerType string) error {
	ctx := context.Background()
	cli, err := client.NewClientWithOpts(client.FromEnv)
	if err != nil {
		return err
	}
	// Placeholder: Get the desired tag and hash from your config
	containerInfo, err := getCurrentContainerInfo()
	if err != nil {
		errMsg := fmt.Errorf("Couldn't get %s container info: %v", containerName, err)
		logger.Error(errMsg)
		return err
	}
	desiredTag := containerInfo["tag"]
	desiredHash := containerInfo["hash"]
	desiredRepo := containerInfo["repo"]
	if desiredTag == "" || desiredHash == "" {
		err = fmt.Errorf("Version info has not been retrieved!")
		logger.Error(err)
		return err
	}
	// Check if the desired image is available locally
	images, err := cli.ImageList(ctx, types.ImageListOptions{})
	if err != nil {
		return err
	}
	imageExistsLocally := false
	for _, img := range images {
		for _, tag := range img.RepoTags {
			if tag == containerType+":"+desiredTag && img.ID == desiredHash {
				imageExistsLocally = true
				break
			}
		}
		if imageExistsLocally {
			break
		}
	}
	if !imageExistsLocally {
		// pull the image if it doesn't exist locally
		_, err = cli.ImagePull(ctx, desiredRepo+":"+desiredTag, types.ImagePullOptions{})
		if err != nil {
			return err
		}
	}
	switch {
	case existingContainer == nil:
		// if the container does not exist, create and start it
		_, err := cli.ContainerCreate(ctx, &container.Config{
			Image: containerType + ":" + containerTag,
		}, nil, nil, nil, containerName)
		if err != nil {
			return err
		}
		err = cli.ContainerStart(ctx, containerName, types.ContainerStartOptions{})
		if err != nil {
			return err
		}
		msg := fmt.Sprintf("%s started with image %s:%s", containerName, containerType, containerTag)
		logger.Info(msg)
	case existingContainer.State == "exited":
		// if the container exists but is stopped, start it
		err := cli.ContainerStart(ctx, containerName, types.ContainerStartOptions{})
		if err != nil {
			return err
		}
		msg := fmt.Sprintf("Started stopped container %s", containerName)
		logger.Info(msg)
	default:
		// if container is running, check the image tag
		currentImage := existingContainer.Image
		currentTag := strings.Split(currentImage, ":")[1]
		if currentTag != containerTag {
			// if the tags don't match, recreate the container with the new tag
			err := cli.ContainerRemove(ctx, containerName, types.ContainerRemoveOptions{Force: true})
			if err != nil {
				return err
			}
			_, err = cli.ContainerCreate(ctx, &container.Config{
				Image: containerType + ":" + containerTag,
			}, nil, nil, nil, containerName)
			if err != nil {
				return err
			}
			err = cli.ContainerStart(ctx, containerName, types.ContainerStartOptions{})
			if err != nil {
				return err
			}
			msg := fmt.Sprintf("Restarted %s with image %s:%s", containerName, containerType, containerTag)
			logger.Info(msg)
		} else {
			msg := fmt.Sprintf("%s is already running with the correct tag: %s", containerName, containerTag)
			logger.Info(msg)
		}
	}
	return nil
}

// convert the version info back into json then a map lol
// so we can easily get the correct repo/release channel/tag/hash
func getCurrentContainerInfo(containerType string) (map[string]string, error) {
	var res map[string]string
	conf := config.Conf()
	releaseChannel := conf.UpdateBranch
	arch := config.Architecture
	hashLabel := arch + "_sha256"
	versionInfo := config.VersionInfo
	jsonData, err := json.Marshal(VersionInfo)
	if err != nil {
		return res, err
	}
	// Convert JSON to map
	var m map[string]interface{}
	err = json.Unmarshal(jsonData, &m)
	if err != nil {
		return res, err
	}
	res["tag"] = m["groundseg"][releaseChannel][containerType]["tag"]
	res["hash"] = m["groundseg"][releaseChannel][containerType][hashLabel]
	res["repo"] = m["groundseg"][releaseChannel][containerType]["repo"]
	return res, nil
}