package app

import (
	"context"
	"errors"
	"fmt"
	"os"

	"coopcloud.tech/abra/cli/internal"
	"coopcloud.tech/abra/pkg/autocomplete"
	"coopcloud.tech/abra/pkg/client"
	"coopcloud.tech/abra/pkg/config"
	containerPkg "coopcloud.tech/abra/pkg/container"
	"coopcloud.tech/abra/pkg/recipe"
	"coopcloud.tech/abra/pkg/upstream/container"
	"github.com/docker/cli/cli/command"
	"github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/filters"
	"github.com/docker/docker/pkg/archive"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

type restoreConfig struct {
	preHookCmd  string
	postHookCmd string
}

var appRestoreCommand = cli.Command{
	Name:      "restore",
	Aliases:   []string{"rs"},
	Usage:     "Run app restore",
	ArgsUsage: "<domain> <service> <file> <path>",
	Flags: []cli.Flag{
		internal.DebugFlag,
	},
	Before:       internal.SubCommandBefore,
	BashComplete: autocomplete.AppNameComplete,
	Description: `
This command runs an app restore.

Pre/post hook commands are defined in the recipe configuration. Abra reads this
config and run the comands in the context of the service before restoring the
backup.

Example:

    abra app restore example.com app mybackup.tar.gz /var/lib/content
`,
	Action: func(c *cli.Context) error {
		app := internal.ValidateApp(c)

		serviceName := c.Args().Get(1)
		if serviceName == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("missing <service>?"))
		}

		backupPath := c.Args().Get(2)
		if backupPath == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("missing <file>?"))
		}

		restorePath := c.Args().Get(3)
		if restorePath == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("missing <path>?"))
		}

		if _, err := os.Stat(backupPath); err != nil {
			if os.IsNotExist(err) {
				logrus.Fatalf("%s doesn't exist?", backupPath)
			}
		}

		recipe, err := recipe.Get(app.Recipe)
		if err != nil {
			logrus.Fatal(err)
		}

		restoreConfigs := make(map[string]restoreConfig)
		for _, service := range recipe.Config.Services {
			if restoreEnabled, ok := service.Deploy.Labels["backupbot.restore"]; ok {
				if restoreEnabled == "true" {
					fullServiceName := fmt.Sprintf("%s_%s", app.StackName(), service.Name)
					rsConfig := restoreConfig{}

					logrus.Debugf("restore config detected for %s", fullServiceName)

					if preHookCmd, ok := service.Deploy.Labels["backupbot.restore.pre-hook"]; ok {
						logrus.Debugf("detected pre-hook command for %s: %s", fullServiceName, preHookCmd)
						rsConfig.preHookCmd = preHookCmd
					}

					if postHookCmd, ok := service.Deploy.Labels["backupbot.restore.post-hook"]; ok {
						logrus.Debugf("detected post-hook command for %s: %s", fullServiceName, postHookCmd)
						rsConfig.postHookCmd = postHookCmd
					}

					restoreConfigs[service.Name] = rsConfig
				}
			}
		}

		rsConfig, ok := restoreConfigs[serviceName]
		if !ok {
			rsConfig = restoreConfig{}
		}
		if err := runRestore(app, backupPath, restorePath, serviceName, rsConfig); err != nil {
			logrus.Fatal(err)
		}

		return nil
	},
}

// runRestore does the actual restore logic.
func runRestore(app config.App, backupPath, restorePath, serviceName string, rsConfig restoreConfig) error {
	cl, err := client.New(app.Server)
	if err != nil {
		return err
	}

	// FIXME: avoid instantiating a new CLI
	dcli, err := command.NewDockerCli()
	if err != nil {
		return err
	}

	filters := filters.NewArgs()
	filters.Add("name", fmt.Sprintf("^%s_%s", app.StackName(), serviceName))

	targetContainer, err := containerPkg.GetContainer(context.Background(), cl, filters, true)
	if err != nil {
		return err
	}

	fullServiceName := fmt.Sprintf("%s_%s", app.StackName(), serviceName)
	if rsConfig.preHookCmd != "" {
		splitCmd := internal.SafeSplit(rsConfig.preHookCmd)

		logrus.Debugf("split pre-hook command for %s into %s", fullServiceName, splitCmd)

		preHookExecOpts := types.ExecConfig{
			AttachStderr: true,
			AttachStdin:  true,
			AttachStdout: true,
			Cmd:          splitCmd,
			Detach:       false,
			Tty:          true,
		}

		if err := container.RunExec(dcli, cl, targetContainer.ID, &preHookExecOpts); err != nil {
			return err
		}

		logrus.Infof("succesfully ran %s pre-hook command: %s", fullServiceName, rsConfig.preHookCmd)
	}

	backupReader, err := os.Open(backupPath)
	if err != nil {
		return err
	}

	content, err := archive.DecompressStream(backupReader)
	if err != nil {
		return err
	}

	copyOpts := types.CopyToContainerOptions{AllowOverwriteDirWithFile: false, CopyUIDGID: false}
	if err := cl.CopyToContainer(context.Background(), targetContainer.ID, restorePath, content, copyOpts); err != nil {
		return err
	}

	logrus.Infof("restored %s to %s:%s", backupPath, fullServiceName, restorePath)

	if rsConfig.postHookCmd != "" {
		splitCmd := internal.SafeSplit(rsConfig.postHookCmd)

		logrus.Debugf("split post-hook command for %s into %s", fullServiceName, splitCmd)

		postHookExecOpts := types.ExecConfig{
			AttachStderr: true,
			AttachStdin:  true,
			AttachStdout: true,
			Cmd:          splitCmd,
			Detach:       false,
			Tty:          true,
		}

		if err := container.RunExec(dcli, cl, targetContainer.ID, &postHookExecOpts); err != nil {
			return err
		}

		logrus.Infof("succesfully ran %s post-hook command: %s", fullServiceName, rsConfig.postHookCmd)
	}

	return nil
}