package v2

import (
	"archive/zip"
	"context"
	"fmt"
	"io"
	"os"
	"path"
	"path/filepath"
	"strings"

	"github.com/logrusorgru/aurora"

	"github.com/manifoldco/promptui"
	"github.com/pkg/errors"
	"github.com/prysmaticlabs/prysm/validator/flags"
	"github.com/urfave/cli/v2"
)

// ImportAccount uses the archived account made from ExportAccount to import an account and
// asks the users for account passwords.
func ImportAccount(cliCtx *cli.Context) error {
	// Read a wallet's directory from user input.
	walletDir, err := inputWalletDir(cliCtx)
	if errors.Is(err, ErrNoWalletFound) {
		return errors.New("no wallet found, create a new one with ./prysm.sh validator wallet-v2 create")
	} else if err != nil {
		return errors.Wrap(err, "could not parse wallet directory")
	}

	backupDir, err := inputImportDir(cliCtx)
	if err != nil {
		log.Fatalf("Could not parse output directory: %v", err)
	}

	accountsImported, err := unzipArchiveToTarget(backupDir, walletDir)
	if err != nil {
		log.WithError(err).Fatal("Could not unzip archive")
	}

	au := aurora.NewAurora(true)
	var loggedAccounts []string
	for _, accountName := range accountsImported {
		loggedAccounts = append(loggedAccounts, fmt.Sprintf("%s", au.BrightGreen(accountName).Bold()))
	}
	fmt.Printf("Importing accounts: %s\n", strings.Join(loggedAccounts, ", "))

	// Read the directory for password storage from user input.
	passwordsDirPath := inputPasswordsDirectory(cliCtx)

	wallet, err := OpenWallet(context.Background(), &WalletConfig{
		CanUnlockAccounts: true,
		PasswordsDir:      passwordsDirPath,
		WalletDir:         walletDir,
	})
	if err != nil {
		log.Fatalf("Could not open wallet: %v", err)
	}

	for _, accountName := range accountsImported {
		if err := wallet.enterPasswordForAccount(cliCtx, accountName); err != nil {
			log.WithError(err).Fatal("Could not set account password")
		}
	}
	if err := logAccountsImported(wallet, accountsImported); err != nil {
		log.WithError(err).Fatal("Could not log accounts imported")
	}

	return nil
}

func inputImportDir(cliCtx *cli.Context) (string, error) {
	outputDir := cliCtx.String(flags.BackupPathFlag.Name)
	if cliCtx.IsSet(flags.BackupPathFlag.Name) {
		return outputDir, nil
	}
	if outputDir == flags.DefaultValidatorDir() {
		outputDir = path.Join(outputDir)
	}
	prompt := promptui.Prompt{
		Label:    "Enter the file location of the exported wallet zip to import",
		Validate: validateDirectoryPath,
		Default:  outputDir,
	}
	outputPath, err := prompt.Run()
	if err != nil {
		return "", fmt.Errorf("could not determine import directory: %v", formatPromptError(err))
	}
	return outputPath, nil
}

func unzipArchiveToTarget(archiveDir string, target string) ([]string, error) {
	archiveFile := filepath.Join(archiveDir, archiveFilename)
	reader, err := zip.OpenReader(archiveFile)
	if err != nil {
		return nil, errors.Wrap(err, "could not open reader for archive")
	}

	perms := os.FileMode(0700)
	if err := os.MkdirAll(target, perms); err != nil {
		return nil, errors.Wrap(err, "could not parent path for folder")
	}

	var accounts []string
	for _, file := range reader.File {
		path := filepath.Join(target, file.Name)
		parentFolder := filepath.Dir(path)
		if file.FileInfo().IsDir() {
			accounts = append(accounts, file.FileInfo().Name())
			if err := os.MkdirAll(path, perms); err != nil {
				return nil, errors.Wrap(err, "could not make path for file")
			}
			continue
		} else {
			if err := os.MkdirAll(parentFolder, perms); err != nil {
				return nil, errors.Wrap(err, "could not make path for file")
			}
		}

		if err := copyFileFromZipToPath(file, path); err != nil {
			return nil, err
		}
	}
	return accounts, nil
}

func copyFileFromZipToPath(file *zip.File, path string) error {
	fileReader, err := file.Open()
	if err != nil {
		return err
	}
	defer func() {
		if err := fileReader.Close(); err != nil {
			log.WithError(err).Error("Could not close file")
		}
	}()

	targetFile, err := os.Create(path)
	if err != nil {
		return errors.Wrap(err, "could not open file")
	}
	defer func() {
		if err := targetFile.Close(); err != nil {
			log.WithError(err).Error("Could not close target")
		}
	}()

	if _, err := io.Copy(targetFile, fileReader); err != nil {
		return errors.Wrap(err, "could not copy file")
	}
	return nil
}

func logAccountsImported(wallet *Wallet, accountNames []string) error {
	au := aurora.NewAurora(true)

	numAccounts := au.BrightYellow(len(accountNames))
	fmt.Println("")
	if len(accountNames) == 1 {
		fmt.Printf("Imported %d validator account\n", numAccounts)
	} else {
		fmt.Printf("Imported %d validator accounts\n", numAccounts)
	}
	for _, accountName := range accountNames {
		fmt.Println("")
		fmt.Printf("%s\n", au.BrightGreen(accountName).Bold())

		publicKey, err := wallet.publicKeyForAccount(accountName)
		if err != nil {
			return errors.Wrap(err, "could not get public key")
		}
		fmt.Printf("%s %#x\n", au.BrightMagenta("[public key]").Bold(), publicKey)

		dirPath := au.BrightCyan("(wallet dir)")
		fmt.Printf("%s %s\n", dirPath, filepath.Join(wallet.AccountsDir(), accountName))
	}
	return nil
}