// Copyright (c) 2014 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"
	"io"
	"testing"
)

// TestFilterCLearLatest tests the MsgFilterLoad API against the latest protocol version.
func TestFilterLoadLatest(t *testing.T) {
	pver := btcwire.ProtocolVersion

	data := []byte{0x01, 0x02}
	msg := btcwire.NewMsgFilterLoad(data, 10, 0, 0)

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

	// Ensure max payadd is expected value for latest protocol version.
	wantPayload := uint32(36018)
	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)
	}

	// Test encode with latest protocol version.
	var buf bytes.Buffer
	err := msg.BtcEncode(&buf, pver)
	if err != nil {
		t.Errorf("encode of MsgFilterLoad failed %v err <%v>", msg, err)
	}

	// Test decode with latest protocol version.
	readmsg := btcwire.MsgFilterLoad{}
	err = readmsg.BtcDecode(&buf, pver)
	if err != nil {
		t.Errorf("decode of MsgFilterLoad failed [%v] err <%v>", buf, err)
	}

	return
}

// TestFilterLoadCrossProtocol tests the MsgFilterLoad API when encoding with the latest
// protocol version and decoded with BIP0031Version.
func TestFilterLoadCrossProtocol(t *testing.T) {
	data := []byte{0x01, 0x02}
	msg := btcwire.NewMsgFilterLoad(data, 10, 0, 0)

	// Encode with old protocol version.
	var buf bytes.Buffer
	err := msg.BtcEncode(&buf, btcwire.BIP0037Version-1)
	if err == nil {
		t.Errorf("encode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}

	// Decode with old protocol version.
	readmsg := btcwire.MsgFilterLoad{}
	err = readmsg.BtcDecode(&buf, btcwire.BIP0031Version)
	if err == nil {
		t.Errorf("decode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}
}

// TestFilterLoadMaxFilterSize tests the MsgFilterLoad API maximum filter size.
func TestFilterLoadMaxFilterSize(t *testing.T) {
	data := bytes.Repeat([]byte{0xff}, 36001)
	msg := btcwire.NewMsgFilterLoad(data, 10, 0, 0)

	// Encode with latest protocol version.
	var buf bytes.Buffer
	err := msg.BtcEncode(&buf, btcwire.ProtocolVersion)
	if err == nil {
		t.Errorf("encode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}

	// Decode with latest protocol version.
	readbuf := bytes.NewReader(data)
	err = msg.BtcDecode(readbuf, btcwire.ProtocolVersion)
	if err == nil {
		t.Errorf("decode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}
}

// TestFilterLoadMaxHashFuncsSize tests the MsgFilterLoad API maximum hash functions.
func TestFilterLoadMaxHashFuncsSize(t *testing.T) {
	data := bytes.Repeat([]byte{0xff}, 10)
	msg := btcwire.NewMsgFilterLoad(data, 61, 0, 0)

	// Encode with latest protocol version.
	var buf bytes.Buffer
	err := msg.BtcEncode(&buf, btcwire.ProtocolVersion)
	if err == nil {
		t.Errorf("encode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}

	newBuf := []byte{
		0x0a,                                                       // filter size
		0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // filter
		0x3d, 0x00, 0x00, 0x00, // max hash funcs
		0x00, 0x00, 0x00, 0x00, // tweak
		0x00, // update Type
	}
	// Decode with latest protocol version.
	buf1 := bytes.NewBuffer(newBuf)
	readbuf := bytes.NewReader(buf1.Bytes())
	err = msg.BtcDecode(readbuf, btcwire.ProtocolVersion)
	if err == nil {
		t.Errorf("decode of MsgFilterLoad succeeded when it shouldn't have %v",
			msg)
	}
}

// TestFilterLoadWireErrors performs negative tests against wire encode and decode
// of MsgFilterLoad to confirm error paths work correctly.
func TestFilterLoadWireErrors(t *testing.T) {
	pver := btcwire.ProtocolVersion

	tests := []struct {
		in       *btcwire.MsgFilterLoad // 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.
		{
			&btcwire.MsgFilterLoad{
				Filter:    []byte{0x01, 0x02, 0x03, 0x04},
				HashFuncs: 10,
				Tweak:     0,
				Flags:     btcwire.BloomUpdateNone,
			},
			[]byte{
				0x04,                   // Varint for size of Filter
				0x01, 0x02, 0x03, 0x04, // Filter
				0x00, 0x0a, // HashFuncs
				0x00, 0x00, // Tweak
				0x00, // Flags
			},
			pver,
			2,
			io.ErrShortWrite,
			io.ErrUnexpectedEOF,
		},
		{
			&btcwire.MsgFilterLoad{
				Filter:    []byte{0x01, 0x02, 0x03, 0x04},
				HashFuncs: 10,
				Tweak:     0,
				Flags:     btcwire.BloomUpdateNone,
			},
			[]byte{
				0x04,                   // Varint for size of Filter
				0x01, 0x02, 0x03, 0x04, // Filter
				0x00, 0x0a, // HashFuncs
				0x00, 0x00, // Tweak
				0x00, // Flags
			},
			pver,
			0,
			io.ErrShortWrite,
			io.EOF,
		},
		{
			&btcwire.MsgFilterLoad{
				Filter:    []byte{0x01, 0x02, 0x03, 0x04},
				HashFuncs: 10,
				Tweak:     0,
				Flags:     btcwire.BloomUpdateNone,
			},
			[]byte{
				0x04,                   // Varint for size of Filter
				0x01, 0x02, 0x03, 0x04, // Filter
				0x00, 0x0a, // HashFuncs
				0x00, 0x00, // Tweak
				0x00, // Flags
			},
			pver,
			10,
			io.ErrShortWrite,
			io.ErrUnexpectedEOF,
		},
	}

	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.MsgFilterLoad
		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
		}
	}
}