package Package

import (
	"errors"
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"

	bolt "go.etcd.io/bbolt"

	"PackageManager/Archive"
	"PackageManager/Client/Database"
	"PackageManager/Client/Filesystem"
	"PackageManager/Color"
	"PackageManager/Helper"
	"PackageManager/Variables"
)

func writeManifestFile(path, name, version string) error {
	var (
		cmd      *exec.Cmd
		manifest string
		filePath string
		e        error
	)

	manifest = fmt.Sprintf(`name: "%s"
version: "%s"
dependancies:
	- pkg1: v1.0.0
	- pkg2: v1.0.0
`, name, version)

	filePath = filepath.Join(path, "manifest.yml")

	e = ioutil.WriteFile(filePath, []byte(manifest), 0644)
	if e != nil {
		return e
	}

	cmd = exec.Command(Variables.Editor, filePath)
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	return cmd.Run()
}

func CreatePackage() error {
	var (
		picksBucket    *bolt.Bucket
		pickedFiles    []string
		pkgFiles       []string
		choices        string
		choicesSplit   []string
		pkgName        string
		pkgVersion     string
		pkgNameVersion string
		tmpDir         string
		index          int
		e              error
	)

	fmt.Println("Initialising package creation...")

	e = Database.FsDB.View(func(tx *bolt.Tx) error {
		picksBucket = tx.Bucket(Variables.FsHashPicksBucket)

		picksBucket.ForEach(func(k, v []byte) error {
			pickedFiles = append(pickedFiles, string(k))
			return nil
		})

		return nil
	})

	fmt.Println("Added files:")
	Filesystem.PrintFiles(pickedFiles, Color.Green, true)

	fmt.Println("Please select the files you would like to use to create the package. Leave empty for all.")
	choices = Helper.Input()

	if choices == "" {
		pkgFiles = pickedFiles
	} else {
		choicesSplit = strings.Split(choices, ",")

		for _, i := range choicesSplit {
			index, e = strconv.Atoi(i)
			if e != nil {
				// TODO: Handle this error
				panic(e)
			}
			if len(pickedFiles) < index {
				return errors.New("Invalid choice")
			}
			pkgFiles = append(pkgFiles, pickedFiles[index])
		}
	}

	fmt.Println("Please enter the package name:")
	pkgName = Helper.Input()
	if pkgName == "" {
		return errors.New("Invalid package name")
	}

	fmt.Println("Please enter the package version:")
	pkgVersion = Helper.Input()
	if pkgVersion == "" {
		return errors.New("Invalid package name")
	}

	fmt.Printf("Package Name: %s\n", pkgName)
	fmt.Printf("Package Version: %s\n", pkgVersion)

	fmt.Println("Files to be added")
	Filesystem.PrintFiles(pkgFiles, Color.Green, false)

	fmt.Println("Is this correct? [y/N]")
	if strings.ToLower(Helper.Input()) != "y" {
		return errors.New("User aborted")
	}

	pkgNameVersion = fmt.Sprintf("%s-%s", pkgName, pkgVersion)

	tmpDir, e = ioutil.TempDir("/tmp", pkgNameVersion)
	if e != nil {
		return e
	}
	defer os.RemoveAll(tmpDir)

	for _, file := range pkgFiles {
		Filesystem.CopyFile(file, filepath.Join(tmpDir, file))
	}

	e = writeManifestFile(tmpDir, pkgName, pkgVersion)
	if e != nil {
		return e
	}

	e = Archive.TarGzip(tmpDir, pkgNameVersion+".tar.gz")
	if e != nil {
		return e
	}

	fmt.Printf(
		Color.Green("\nSuccessfully created package %s\n"),
		pkgNameVersion,
	)

	return nil
}