package app

import (
	"context"
	"fmt"
	"os"
	"strings"

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

var appCpCommand = cli.Command{
	Name:      "cp",
	Aliases:   []string{"c"},
	ArgsUsage: "<src> <dst>",
	Flags: []cli.Flag{
		internal.DebugFlag,
		internal.NoInputFlag,
	},
	Before: internal.SubCommandBefore,
	Usage:  "Copy files to/from a running app service",
	Description: `
This command supports copying files to and from any app service file system.

If you want to copy a myfile.txt to the root of the app service:

    abra app cp <app> myfile.txt app:/

And if you want to copy that file back to your current working directory locally:

		abra app cp <app> app:/myfile.txt .

`,
	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")
		}

		if !isToContainer {
			if _, err := os.Stat(dstPath); os.IsNotExist(err) {
				logrus.Fatalf("%s does not exist locally?", dstPath)
			}
		}
		err := configureAndCp(c, app, srcPath, dstPath, service, isToContainer)
		if err != nil {
			logrus.Fatal(err)
		}
		return nil

	},
	BashComplete: autocomplete.AppNameComplete,
}

func configureAndCp(
	c *cli.Context,
	app config.App,
	srcPath string,
	dstPath string,
	service string,
	isToContainer bool) error {
	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))

	container, err := container.GetContainer(context.Background(), cl, filters, true)
	if err != nil {
		logrus.Fatal(err)
	}

	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(context.Background(), container.ID, dstPath, content, copyOpts); err != nil {
			logrus.Fatal(err)
		}
	} else {
		content, _, err := cl.CopyFromContainer(context.Background(), 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
}