package server

import (
	"context"
	"errors"
	"os/exec"
	"os/user"
	"strings"

	"coopcloud.tech/abra/cli/internal"
	"coopcloud.tech/abra/pkg/client"
	"coopcloud.tech/abra/pkg/server"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli/v2"
)

var local bool
var localFlag = &cli.BoolFlag{
	Name:        "local",
	Aliases:     []string{"L"},
	Value:       false,
	Usage:       "Set up the local server",
	Destination: &local,
}

var serverAddCommand = &cli.Command{
	Name:  "add",
	Usage: "Add a new server",
	Description: `
This command adds a new server that abra will communicate with, to deploy apps.

If "--local" is passed, then Abra assumes that the current local server is
intended as the target server.

Otherwise, you may specify a remote server. The <domain> argument must be a
publicy accessible domain name which points to your server. You should have SSH
access to this server, Abra will assume port 22 and will use your current
system username to make an initial connection. You can use the <user> and
<port> arguments to adjust this.

For example:

    abra server add varia.zone glodemodem 12345

Abra will construct the following SSH connection string then:

    ssh://globemodem@varia.zone:12345

All communication between Abra and the server will use this SSH connection.
`,
	Aliases: []string{"a"},
	Flags: []cli.Flag{
		localFlag,
	},
	ArgsUsage: "<domain> [<user>] [<port>]",
	Action: func(c *cli.Context) error {

		if c.Args().Len() == 2 && !local {
			err := errors.New("missing arguments <domain> or '--local'")
			internal.ShowSubcommandHelpAndError(c, err)
		}

		if c.Args().Get(2) != "" && local {
			err := errors.New("cannot use '<domain>' and '--local' together")
			internal.ShowSubcommandHelpAndError(c, err)
		}

		domainName := "default"

		if local {
			if err := server.CreateServerDir(domainName); err != nil {
				logrus.Fatal(err)
			}
			if _, err := exec.LookPath("docker"); err != nil {
				return errors.New("docker command not found on $PATH, is it installed?")
			}
			logrus.Info("local server has been added")
			return nil
		}

		domainName = internal.ValidateDomain(c)

		var username string
		var port string

		username = c.Args().Get(1)
		if username == "" {
			systemUser, err := user.Current()
			if err != nil {
				logrus.Fatal(err)
			}
			username = systemUser.Username
		}

		port = c.Args().Get(2)
		if port == "" {
			port = "22"
		}

		store := client.NewDefaultDockerContextStore()
		contexts, err := store.Store.List()
		if err != nil {
			logrus.Fatal(err)
		}

		for _, context := range contexts {
			if context.Name == domainName {
				logrus.Fatalf("server at '%s' already exists?", domainName)
			}
		}

		logrus.Debugf("creating context with domain '%s', username '%s' and port '%s'", domainName, username, port)

		if err := client.CreateContext(domainName, username, port); err != nil {
			logrus.Fatal(err)
		}

		ctx := context.Background()
		cl, err := client.New(domainName)
		if err != nil {
			logrus.Warn("cleaning up context due to connection failure")
			if err := client.DeleteContext(domainName); err != nil {
				logrus.Fatal(err)
			}
			logrus.Fatal(err)
		}

		if _, err := cl.Info(ctx); err != nil {
			if strings.Contains(err.Error(), "command not found") {
				logrus.Fatalf("docker is not installed on '%s'?", domainName)
			} else {
				logrus.Warn("cleaning up context due to connection failure")
				if err := client.DeleteContext(domainName); err != nil {
					logrus.Fatal(err)
				}
				logrus.Fatalf("unable to make a connection to '%s'?", domainName)
			}
			logrus.Debug(err)
		}

		logrus.Debugf("remote connection to '%s' is definitely up", domainName)

		if err := server.CreateServerDir(domainName); err != nil {
			logrus.Fatal(err)
		}

		logrus.Infof("server at '%s' has been added", domainName)

		return nil
	},
}