// Copyright (c) 2014-2015 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package main

import (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/lbryio/lbcd/chaincfg"
	"github.com/lbryio/lbcd/wire"
	"github.com/lbryio/lbcwallet/internal/prompt"
	"github.com/lbryio/lbcwallet/wallet"
	"github.com/lbryio/lbcwallet/walletdb"
	_ "github.com/lbryio/lbcwallet/walletdb/bdb"
)

// networkDir returns the directory name of a network directory to hold wallet
// files.
func networkDir(dataDir string, chainParams *chaincfg.Params) string {
	netname := chainParams.Name

	// For now, we must always name the testnet data directory as "testnet"
	// and not "testnet3" or any other version, as the chaincfg testnet3
	// parameters will likely be switched to being named "testnet3" in the
	// future.  This is done to future proof that change, and an upgrade
	// plan to move the testnet3 data directory can be worked out later.
	if chainParams.Net == wire.TestNet3 {
		netname = "testnet"
	}

	return filepath.Join(dataDir, netname)
}

// createWallet prompts the user for information needed to generate a new wallet
// and generates the wallet accordingly.  The new wallet will reside at the
// provided path.
func createWallet(cfg *config) error {
	dbDir := networkDir(cfg.AppDataDir.Value, activeNet.Params)
	loader := wallet.NewLoader(
		activeNet.Params, dbDir, true, cfg.DBTimeout, 250,
	)

	// Start by prompting for the passphrase.
	reader := bufio.NewReader(os.Stdin)
	privPass, err := prompt.Passphrase(reader)
	if err != nil {
		return err
	}

	// Ascertain the wallet generation seed.  This will either be an
	// automatically generated value the user has already confirmed or a
	// value the user has entered which has already been validated.
	seed, bday, err := prompt.Seed(reader)
	if err != nil {
		return err
	}

	fmt.Println("Creating the wallet...")
	w, err := loader.CreateNewWallet(privPass, seed, bday)
	if err != nil {
		return err
	}

	w.Manager.Close()

	fmt.Println("The wallet has been created successfully with birthday:", bday.Format(time.UnixDate))

	return nil
}

// createSimulationWallet is intended to be called from the rpcclient
// and used to create a wallet for actors involved in simulations.
func createSimulationWallet(cfg *config) error {
	// Simulation wallet password is 'password'.
	privPass := []byte("password")

	netDir := networkDir(cfg.AppDataDir.Value, activeNet.Params)

	// Create the wallet.
	dbPath := filepath.Join(netDir, wallet.WalletDBName)
	fmt.Println("Creating the wallet...")

	// Create the wallet database backed by bolt db.
	db, err := walletdb.Create("bdb", dbPath, true, cfg.DBTimeout)
	if err != nil {
		return err
	}
	defer db.Close()

	// Create the wallet.
	err = wallet.Create(db, privPass, nil, activeNet.Params, time.Now())
	if err != nil {
		return err
	}

	fmt.Println("The wallet has been created successfully.")
	return nil
}

// checkCreateDir checks that the path exists and is a directory.
// If path does not exist, it is created.
func checkCreateDir(path string) error {
	if fi, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			// Attempt data directory creation
			if err = os.MkdirAll(path, 0700); err != nil {
				return fmt.Errorf("cannot create directory: %s", err)
			}
		} else {
			return fmt.Errorf("error checking directory: %s", err)
		}
	} else {
		if !fi.IsDir() {
			return fmt.Errorf("path '%s' is not a directory", path)
		}
	}

	return nil
}