// Copyright (c) 2013 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package btcwire_test

import (
	"bytes"
	"github.com/conformal/btcwire"
	"github.com/davecgh/go-spew/spew"
	"io"
	"reflect"
	"testing"
	"time"
)

// TestBlock tests the MsgBlock API.
func TestBlock(t *testing.T) {
	pver := btcwire.ProtocolVersion

	// Block 1 header.
	prevHash := &blockOne.Header.PrevBlock
	merkleHash := &blockOne.Header.MerkleRoot
	bits := blockOne.Header.Bits
	nonce := blockOne.Header.Nonce
	bh := btcwire.NewBlockHeader(prevHash, merkleHash, bits, nonce)

	// Ensure the command is expected value.
	wantCmd := "block"
	msg := btcwire.NewMsgBlock(bh)
	if cmd := msg.Command(); cmd != wantCmd {
		t.Errorf("NewMsgBlock: wrong command - got %v want %v",
			cmd, wantCmd)
	}

	// Ensure max payload is expected value for latest protocol version.
	// Num addresses (varInt) + max allowed addresses.
	wantPayload := uint32(1024 * 1024 * 32)
	maxPayload := msg.MaxPayloadLength(pver)
	if maxPayload != wantPayload {
		t.Errorf("MaxPayloadLength: wrong max payload length for "+
			"protocol version %d - got %v, want %v", pver,
			maxPayload, wantPayload)
	}

	// Ensure we get the same block header data back out.
	if !reflect.DeepEqual(&msg.Header, bh) {
		t.Errorf("NewMsgBlock: wrong block header - got %v, want %v",
			spew.Sdump(&msg.Header), spew.Sdump(bh))
	}

	// Ensure transactions are added properly.
	tx := blockOne.Transactions[0].Copy()
	msg.AddTransaction(tx)
	if !reflect.DeepEqual(msg.Transactions, blockOne.Transactions) {
		t.Errorf("AddTransaction: wrong transactions - got %v, want %v",
			spew.Sdump(msg.Transactions),
			spew.Sdump(blockOne.Transactions))
	}

	// Ensure transactions are properly cleared.
	msg.ClearTransactions()
	if len(msg.Transactions) != 0 {
		t.Errorf("ClearTransactions: wrong transactions - got %v, want %v",
			len(msg.Transactions), 0)
	}

	return
}

// TestBlockTxShas tests the ability to generate a slice of all transaction
// hashes from a block accurately.
func TestBlockTxShas(t *testing.T) {
	// Use protocol version 60002 specifically here instead of the latest
	// because the test data is using bytes encoded with that protocol
	// version.
	pver := uint32(60002)

	// Block 1, transaction 1 hash.
	hashStr := "0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098"
	wantHash, err := btcwire.NewShaHashFromStr(hashStr)
	if err != nil {
		t.Errorf("NewShaHashFromStr: %v", err)
		return
	}

	wantShas := []btcwire.ShaHash{*wantHash}
	shas, err := blockOne.TxShas(pver)
	if err != nil {
		t.Errorf("TxShas: %v", err)
	}
	if !reflect.DeepEqual(shas, wantShas) {
		t.Errorf("TxShas: wrong transaction hashes - got %v, want %v",
			spew.Sdump(shas), spew.Sdump(wantShas))
	}
}

// TestBlockSha tests the ability to generate the hash of a block accurately.
func TestBlockSha(t *testing.T) {
	// Use protocol version 60002 specifically here instead of the latest
	// because the test data is using bytes encoded with that protocol
	// version.
	pver := uint32(60002)

	// Block 1 hash.
	hashStr := "839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"
	wantHash, err := btcwire.NewShaHashFromStr(hashStr)
	if err != nil {
		t.Errorf("NewShaHashFromStr: %v", err)
	}

	// Ensure the hash produced is expected.
	blockHash, err := blockOne.BlockSha(pver)
	if err != nil {
		t.Errorf("BlockSha: %v", err)
	}
	if !blockHash.IsEqual(wantHash) {
		t.Errorf("BlockSha: wrong hash - got %v, want %v",
			spew.Sprint(blockHash), spew.Sprint(wantHash))
	}
}

// TestBlockWire tests the MsgBlock wire encode and decode for various numbers
// of transaction inputs and outputs and protocol versions.
func TestBlockWire(t *testing.T) {
	tests := []struct {
		in     *btcwire.MsgBlock // Message to encode
		out    *btcwire.MsgBlock // Expected decoded message
		buf    []byte            // Wire encoding
		txLocs []btcwire.TxLoc   // Expected transaction locations
		pver   uint32            // Protocol version for wire encoding
	}{
		// Latest protocol version.
		{
			&blockOne,
			&blockOne,
			blockOneBytes,
			blockOneTxLocs,
			btcwire.ProtocolVersion,
		},

		// Protocol version BIP0035Version.
		{
			&blockOne,
			&blockOne,
			blockOneBytes,
			blockOneTxLocs,
			btcwire.BIP0035Version,
		},

		// Protocol version BIP0031Version.
		{
			&blockOne,
			&blockOne,
			blockOneBytes,
			blockOneTxLocs,
			btcwire.BIP0031Version,
		},

		// Protocol version NetAddressTimeVersion.
		{
			&blockOne,
			&blockOne,
			blockOneBytes,
			blockOneTxLocs,
			btcwire.NetAddressTimeVersion,
		},

		// Protocol version MultipleAddressVersion.
		{
			&blockOne,
			&blockOne,
			blockOneBytes,
			blockOneTxLocs,
			btcwire.MultipleAddressVersion,
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode the message to wire format.
		var buf bytes.Buffer
		err := test.in.BtcEncode(&buf, test.pver)
		if err != nil {
			t.Errorf("BtcEncode #%d error %v", i, err)
			continue
		}
		if !bytes.Equal(buf.Bytes(), test.buf) {
			t.Errorf("BtcEncode #%d\n got: %s want: %s", i,
				spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
			continue
		}

		// Decode the message from wire format.
		var msg btcwire.MsgBlock
		rbuf := bytes.NewBuffer(test.buf)
		err = msg.BtcDecode(rbuf, test.pver)
		if err != nil {
			t.Errorf("BtcDecode #%d error %v", i, err)
			continue
		}
		if !reflect.DeepEqual(&msg, test.out) {
			t.Errorf("BtcDecode #%d\n got: %s want: %s", i,
				spew.Sdump(&msg), spew.Sdump(test.out))
			continue
		}

		var txLocMsg btcwire.MsgBlock
		rbuf = bytes.NewBuffer(test.buf)
		txLocs, err := txLocMsg.BtcDecodeTxLoc(rbuf, test.pver)
		if err != nil {
			t.Errorf("BtcDecodeTxLoc #%d error %v", i, err)
			continue
		}
		if !reflect.DeepEqual(&txLocMsg, test.out) {
			t.Errorf("BtcDecodeTxLoc #%d\n got: %s want: %s", i,
				spew.Sdump(&txLocMsg), spew.Sdump(test.out))
			continue
		}
		if !reflect.DeepEqual(txLocs, test.txLocs) {
			t.Errorf("BtcDecodeTxLoc #%d\n got: %s want: %s", i,
				spew.Sdump(txLocs), spew.Sdump(test.txLocs))
			continue
		}
	}
}

// TestBlockWireErrors performs negative tests against wire encode and decode
// of MsgBlock to confirm error paths work correctly.
func TestBlockWireErrors(t *testing.T) {
	// Use protocol version 60002 specifically here instead of the latest
	// because the test data is using bytes encoded with that protocol
	// version.
	pver := uint32(60002)

	tests := []struct {
		in       *btcwire.MsgBlock // Value to encode
		buf      []byte            // Wire encoding
		pver     uint32            // Protocol version for wire encoding
		max      int               // Max size of fixed buffer to induce errors
		writeErr error             // Expected write error
		readErr  error             // Expected read error
	}{
		// Latest protocol version with intentional read/write errors.
		// Force error in version.
		{&blockOne, []byte{}, pver, 0, io.ErrShortWrite, io.EOF},
		// Force error in prev block hash.
		{&blockOne, []byte{}, pver, 4, io.ErrShortWrite, io.EOF},
		// Force error in merkle root.
		{&blockOne, []byte{}, pver, 36, io.ErrShortWrite, io.EOF},
		// Force error in timestamp.
		{&blockOne, []byte{}, pver, 68, io.ErrShortWrite, io.EOF},
		// Force error in difficulty bits.
		{&blockOne, []byte{}, pver, 72, io.ErrShortWrite, io.EOF},
		// Force error in header nonce.
		{&blockOne, []byte{}, pver, 76, io.ErrShortWrite, io.EOF},
		// Force error in transaction count.
		{&blockOne, []byte{}, pver, 80, io.ErrShortWrite, io.EOF},
		// Force error in transactions.
		{&blockOne, blockOneBytes, pver, 81, io.ErrShortWrite, io.EOF},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode to wire format.
		w := newFixedWriter(test.max)
		err := test.in.BtcEncode(w, test.pver)
		if err != test.writeErr {
			t.Errorf("BtcEncode #%d wrong error got: %v, want: %v",
				i, err, test.writeErr)
			continue
		}

		// Decode from wire format.
		var msg btcwire.MsgBlock
		r := newFixedReader(test.max, test.buf)
		err = msg.BtcDecode(r, test.pver)
		if err != test.readErr {
			t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
				i, err, test.readErr)
			continue
		}
	}
}

var blockOne btcwire.MsgBlock = btcwire.MsgBlock{
	Header: btcwire.BlockHeader{
		Version: 1,
		PrevBlock: btcwire.ShaHash{
			0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
			0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
			0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
			0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
		},
		MerkleRoot: btcwire.ShaHash{
			0x98, 0x20, 0x51, 0xfd, 0x1e, 0x4b, 0xa7, 0x44,
			0xbb, 0xbe, 0x68, 0x0e, 0x1f, 0xee, 0x14, 0x67,
			0x7b, 0xa1, 0xa3, 0xc3, 0x54, 0x0b, 0xf7, 0xb1,
			0xcd, 0xb6, 0x06, 0xe8, 0x57, 0x23, 0x3e, 0x0e,
		},

		Timestamp: time.Unix(0x4966bc61, 0), // 2009-01-08 20:54:25 -0600 CST
		Bits:      0x1d00ffff,               // 486604799
		Nonce:     0x9962e301,               // 2573394689
		TxnCount:  1,
	},
	Transactions: []*btcwire.MsgTx{
		&btcwire.MsgTx{
			Version: 1,
			TxIn: []*btcwire.TxIn{
				&btcwire.TxIn{
					PreviousOutpoint: btcwire.OutPoint{
						Hash:  btcwire.ShaHash{},
						Index: 0xffffffff,
					},
					SignatureScript: []byte{
						0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04,
					},
					Sequence: 0xffffffff,
				},
			},
			TxOut: []*btcwire.TxOut{
				&btcwire.TxOut{
					Value: 0x12a05f200,
					PkScript: []byte{
						0x41, // OP_DATA_65
						0x04, 0x96, 0xb5, 0x38, 0xe8, 0x53, 0x51, 0x9c,
						0x72, 0x6a, 0x2c, 0x91, 0xe6, 0x1e, 0xc1, 0x16,
						0x00, 0xae, 0x13, 0x90, 0x81, 0x3a, 0x62, 0x7c,
						0x66, 0xfb, 0x8b, 0xe7, 0x94, 0x7b, 0xe6, 0x3c,
						0x52, 0xda, 0x75, 0x89, 0x37, 0x95, 0x15, 0xd4,
						0xe0, 0xa6, 0x04, 0xf8, 0x14, 0x17, 0x81, 0xe6,
						0x22, 0x94, 0x72, 0x11, 0x66, 0xbf, 0x62, 0x1e,
						0x73, 0xa8, 0x2c, 0xbf, 0x23, 0x42, 0xc8, 0x58,
						0xee, // 65-byte signature
						0xac, // OP_CHECKSIG
					},
				},
			},
			LockTime: 0,
		},
	},
}

// Block one bytes encoded with protocol version 60002.
var blockOneBytes = []byte{
	0x01, 0x00, 0x00, 0x00, // Version 1
	0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
	0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
	0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
	0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, // PrevBlock
	0x98, 0x20, 0x51, 0xfd, 0x1e, 0x4b, 0xa7, 0x44,
	0xbb, 0xbe, 0x68, 0x0e, 0x1f, 0xee, 0x14, 0x67,
	0x7b, 0xa1, 0xa3, 0xc3, 0x54, 0x0b, 0xf7, 0xb1,
	0xcd, 0xb6, 0x06, 0xe8, 0x57, 0x23, 0x3e, 0x0e, // MerkleRoot
	0x61, 0xbc, 0x66, 0x49, // Timestamp
	0xff, 0xff, 0x00, 0x1d, // Bits
	0x01, 0xe3, 0x62, 0x99, // Nonce
	0x01,                   // TxnCount
	0x01, 0x00, 0x00, 0x00, // Version
	0x01, // Varint for number of input transactions
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //  // Previous output hash
	0xff, 0xff, 0xff, 0xff, // Prevous output index
	0x07,                                     // Varint for length of signature script
	0x04, 0xff, 0xff, 0x00, 0x1d, 0x01, 0x04, // Signature script
	0xff, 0xff, 0xff, 0xff, // Sequence
	0x01,                                           // Varint for number of output transactions
	0x00, 0xf2, 0x05, 0x2a, 0x01, 0x00, 0x00, 0x00, // Transaction amount
	0x43, // Varint for length of pk script
	0x41, // OP_DATA_65
	0x04, 0x96, 0xb5, 0x38, 0xe8, 0x53, 0x51, 0x9c,
	0x72, 0x6a, 0x2c, 0x91, 0xe6, 0x1e, 0xc1, 0x16,
	0x00, 0xae, 0x13, 0x90, 0x81, 0x3a, 0x62, 0x7c,
	0x66, 0xfb, 0x8b, 0xe7, 0x94, 0x7b, 0xe6, 0x3c,
	0x52, 0xda, 0x75, 0x89, 0x37, 0x95, 0x15, 0xd4,
	0xe0, 0xa6, 0x04, 0xf8, 0x14, 0x17, 0x81, 0xe6,
	0x22, 0x94, 0x72, 0x11, 0x66, 0xbf, 0x62, 0x1e,
	0x73, 0xa8, 0x2c, 0xbf, 0x23, 0x42, 0xc8, 0x58,
	0xee,                   // 65-byte signature
	0xac,                   // OP_CHECKSIG
	0x00, 0x00, 0x00, 0x00, // Lock time
}

// Transaction location information for block one trasnactions as encoded with
// protocol version 60002.
var blockOneTxLocs = []btcwire.TxLoc{
	btcwire.TxLoc{TxStart: 81, TxLen: 134},
}