package app

import (
	"fmt"
	"os"
	"strings"

	"coopcloud.tech/abra/cli/formatter"
	"coopcloud.tech/abra/cli/internal"
	"coopcloud.tech/abra/pkg/client"
	"coopcloud.tech/abra/pkg/config"
	"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/v2"
)

var appCpCommand = &cli.Command{
	Name:      "cp",
	Aliases:   []string{"c"},
	ArgsUsage: "<src> <dst>",
	Usage:     "Copy files to/from a running app service",
	Action: func(c *cli.Context) error {
		app := internal.ValidateApp(c)

		src := c.Args().Get(1)
		dst := c.Args().Get(2)
		if src == "" {
			logrus.Fatal("missing <src> argument")
		} else if dst == "" {
			logrus.Fatal("missing <dest> argument")
		}

		parsedSrc := strings.SplitN(src, ":", 2)
		parsedDst := strings.SplitN(dst, ":", 2)
		errorMsg := "one of <src>/<dest> arguments must take $SERVICE:$PATH form"
		if len(parsedSrc) == 2 && len(parsedDst) == 2 {
			logrus.Fatal(errorMsg)
		} else if len(parsedSrc) != 2 {
			if len(parsedDst) != 2 {
				logrus.Fatal(errorMsg)
			}
		} else if len(parsedDst) != 2 {
			if len(parsedSrc) != 2 {
				logrus.Fatal(errorMsg)
			}
		}

		var service string
		var srcPath string
		var dstPath string
		isToContainer := false // <container:src> <dst>
		if len(parsedSrc) == 2 {
			service = parsedSrc[0]
			srcPath = parsedSrc[1]
			dstPath = dst
			logrus.Debugf("assuming transfer is coming FROM the container")
		} else if len(parsedDst) == 2 {
			service = parsedDst[0]
			dstPath = parsedDst[1]
			srcPath = src
			isToContainer = true // <src> <container:dst>
			logrus.Debugf("assuming transfer is going TO the container")
		}

		appFiles, err := config.LoadAppFiles("")
		if err != nil {
			logrus.Fatal(err)
		}

		appEnv, err := config.GetApp(appFiles, app.Name)
		if err != nil {
			logrus.Fatal(err)
		}

		cl, err := client.New(app.Server)
		if err != nil {
			logrus.Fatal(err)
		}

		filters := filters.NewArgs()
		filters.Add("name", fmt.Sprintf("%s_%s", appEnv.StackName(), service))
		containers, err := cl.ContainerList(c.Context, types.ContainerListOptions{Filters: filters})
		if err != nil {
			logrus.Fatal(err)
		}

		if len(containers) != 1 {
			logrus.Fatalf("expected 1 container but got %v", len(containers))
		}
		container := containers[0]

		logrus.Debugf("retrieved '%s' as target container on '%s'", formatter.ShortenID(container.ID), app.Server)

		if isToContainer {
			if _, err := os.Stat(srcPath); err != nil {
				logrus.Fatalf("'%s' does not exist?", srcPath)
			}

			toTarOpts := &archive.TarOptions{NoOverwriteDirNonDir: true, Compression: archive.Gzip}
			content, err := archive.TarWithOptions(srcPath, toTarOpts)
			if err != nil {
				logrus.Fatal(err)
			}

			copyOpts := types.CopyToContainerOptions{AllowOverwriteDirWithFile: false, CopyUIDGID: false}
			if err := cl.CopyToContainer(c.Context, container.ID, dstPath, content, copyOpts); err != nil {
				logrus.Fatal(err)
			}
		} else {
			content, _, err := cl.CopyFromContainer(c.Context, container.ID, srcPath)
			if err != nil {
				logrus.Fatal(err)
			}
			defer content.Close()
			fromTarOpts := &archive.TarOptions{NoOverwriteDirNonDir: true, Compression: archive.Gzip}
			if err := archive.Untar(content, dstPath, fromTarOpts); err != nil {
				logrus.Fatal(err)
			}
		}
		return nil
	},
}