// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information

package wizard

import (
	"bytes"
	"fmt"
	"net"
	"os"

	"github.com/spf13/cobra"
	"github.com/zeebo/errs"
	"golang.org/x/crypto/ssh/terminal"

	"storj.io/common/storj"
)

// PromptForAccessName handles user input for access name to be used with wizards
func PromptForAccessName() (string, error) {
	_, err := fmt.Printf("Choose an access name [\"default\"]: ")
	if err != nil {
		return "", err
	}

	var accessName string
	n, err := fmt.Scanln(&accessName)
	if err != nil && n != 0 {
		return "", err
	}

	if accessName == "" {
		return "default", nil
	}
	return accessName, nil
}

// PromptForSatellite handles user input for a satellite address to be used with wizards
func PromptForSatellite(cmd *cobra.Command) (string, error) {
	satellites := []string{
		"12EayRS2V1kEsWESU9QMRseFhdxYxKicsiFmxrsLZHeLUtdps3S@us-central-1.tardigrade.io:7777",
		"12L9ZFwhzVpuEKMUNUqkaTLGzwY9G24tbiigLiXpmZWKwmcNDDs@europe-west-1.tardigrade.io:7777",
		"121RTSDpyNZVcEU84Ticf2L1ntiuUimbWgfATz21tuvgk3vzoA6@asia-east-1.tardigrade.io:7777",
	}

	_, err := fmt.Print("Select your satellite:\n")
	if err != nil {
		return "", err
	}

	for iterator, value := range satellites {
		nodeURL, err := storj.ParseNodeURL(value)
		if err != nil {
			return "", err
		}

		host, _, err := net.SplitHostPort(nodeURL.Address)
		if err != nil {
			return "", err
		}

		_, err = fmt.Printf("\t[%d] %s\n", iterator+1, host)
		if err != nil {
			return "", nil
		}
	}

	_, err = fmt.Print(`Enter number or satellite address as "<nodeid>@<address>:<port>" [1]: `)
	if err != nil {
		return "", err
	}

	var satelliteAddress string
	n, err := fmt.Scanln(&satelliteAddress)
	if err != nil {
		if n != 0 {
			return "", err
		}
		// fmt.Scanln cannot handle empty input
		satelliteAddress = satellites[0]
	}

	if len(satelliteAddress) == 0 {
		return "", errs.New("satellite address cannot be empty")
	}

	if len(satelliteAddress) == 1 {
		switch satelliteAddress {
		case "1":
			satelliteAddress = satellites[0]
		case "2":
			satelliteAddress = satellites[1]
		case "3":
			satelliteAddress = satellites[2]
		default:
			return "", errs.New("satellite address cannot be one character")
		}
	}

	nodeURL, err := storj.ParseNodeURL(satelliteAddress)
	if err != nil {
		return "", err
	}

	if nodeURL.ID.IsZero() {
		return "", errs.New(`missing node id, satellite address must be in the format "<nodeid>@<address>:<port>"`)
	}

	return satelliteAddress, nil
}

// PromptForAPIKey handles user input for an API key to be used with wizards
func PromptForAPIKey() (string, error) {
	_, err := fmt.Print("Enter your API key: ")
	if err != nil {
		return "", err
	}
	var apiKey string
	n, err := fmt.Scanln(&apiKey)
	if err != nil && n != 0 {
		return "", err
	}

	if apiKey == "" {
		return "", errs.New("API key cannot be empty")
	}

	return apiKey, nil
}

// PromptForEncryptionPassphrase handles user input for an encryption passphrase to be used with wizards
func PromptForEncryptionPassphrase() (string, error) {
	_, err := fmt.Print("Enter your encryption passphrase: ")
	if err != nil {
		return "", err
	}
	encKey, err := terminal.ReadPassword(int(os.Stdin.Fd()))
	if err != nil {
		return "", err
	}
	_, err = fmt.Println()
	if err != nil {
		return "", err
	}

	if len(encKey) == 0 {
		return "", errs.New("Encryption passphrase cannot be empty")
	}

	_, err = fmt.Print("Enter your encryption passphrase again: ")
	if err != nil {
		return "", err
	}
	repeatedEncKey, err := terminal.ReadPassword(int(os.Stdin.Fd()))
	if err != nil {
		return "", err
	}
	_, err = fmt.Println()
	if err != nil {
		return "", err
	}

	if !bytes.Equal(encKey, repeatedEncKey) {
		return "", errs.New("encryption passphrase does not match")
	}

	return string(encKey), nil
}