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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

// This file contains the code snippets from the developer's guide embedded into
// Go tests. This ensures that any code published in out guides will not break
// accidentally via some code update. If some API changes nonetheless that needs
// modifying this file, please port any modification over into the developer's
// guide wiki pages too!

package guide

import (
    "io/ioutil"
    "os"
    "path/filepath"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/accounts"
    "github.com/ethereum/go-ethereum/common"
)

// Tests that the account management snippets work correctly.
func TestAccountManagement(t *testing.T) {
    // Create a temporary folder to work with
    workdir, err := ioutil.TempDir("", "")
    if err != nil {
        t.Fatalf("Failed to create temporary work dir: %v", err)
    }
    defer os.RemoveAll(workdir)

    // Create an encrypted keystore manager with standard crypto parameters
    am := accounts.NewManager(filepath.Join(workdir, "keystore"), accounts.StandardScryptN, accounts.StandardScryptP)

    // Create a new account with the specified encryption passphrase
    newAcc, err := am.NewAccount("Creation password")
    if err != nil {
        t.Fatalf("Failed to create new account: %v", err)
    }
    // Export the newly created account with a different passphrase. The returned
    // data from this method invocation is a JSON encoded, encrypted key-file
    jsonAcc, err := am.Export(newAcc, "Creation password", "Export password")
    if err != nil {
        t.Fatalf("Failed to export account: %v", err)
    }
    // Update the passphrase on the account created above inside the local keystore
    if err := am.Update(newAcc, "Creation password", "Update password"); err != nil {
        t.Fatalf("Failed to update account: %v", err)
    }
    // Delete the account updated above from the local keystore
    if err := am.Delete(newAcc, "Update password"); err != nil {
        t.Fatalf("Failed to delete account: %v", err)
    }
    // Import back the account we've exported (and then deleted) above with yet
    // again a fresh passphrase
    if _, err := am.Import(jsonAcc, "Export password", "Import password"); err != nil {
        t.Fatalf("Failed to import account: %v", err)
    }
    // Create a new account to sign transactions with
    signer, err := am.NewAccount("Signer password")
    if err != nil {
        t.Fatalf("Failed to create signer account: %v", err)
    }
    txHash := common.HexToHash("0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef")

    // Sign a transaction with a single authorization
    if _, err := am.SignWithPassphrase(signer, "Signer password", txHash.Bytes()); err != nil {
        t.Fatalf("Failed to sign with passphrase: %v", err)
    }
    // Sign a transaction with multiple manually cancelled authorizations
    if err := am.Unlock(signer, "Signer password"); err != nil {
        t.Fatalf("Failed to unlock account: %v", err)
    }
    if _, err := am.Sign(signer.Address, txHash.Bytes()); err != nil {
        t.Fatalf("Failed to sign with unlocked account: %v", err)
    }
    if err := am.Lock(signer.Address); err != nil {
        t.Fatalf("Failed to lock account: %v", err)
    }
    // Sign a transaction with multiple automatically cancelled authorizations
    if err := am.TimedUnlock(signer, "Signer password", time.Second); err != nil {
        t.Fatalf("Failed to time unlock account: %v", err)
    }
    if _, err := am.Sign(signer.Address, txHash.Bytes()); err != nil {
        t.Fatalf("Failed to sign with time unlocked account: %v", err)
    }
}