package privval

import (
	"net"
	"testing"
	"time"

	"github.com/pkg/errors"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/tendermint/tendermint/crypto/ed25519"
	cmn "github.com/tendermint/tendermint/libs/common"
	"github.com/tendermint/tendermint/libs/log"
	"github.com/tendermint/tendermint/types"
)

// TestRemoteSignerRetryTCPOnly will test connection retry attempts over TCP. We
// don't need this for Unix sockets because the OS instantly knows the state of
// both ends of the socket connection. This basically causes the
// RemoteSigner.dialer() call inside RemoteSigner.connect() to return
// successfully immediately, putting an instant stop to any retry attempts.
func TestRemoteSignerRetryTCPOnly(t *testing.T) {
	var (
		attemptc = make(chan int)
		retries  = 2
	)

	ln, err := net.Listen("tcp", "127.0.0.1:0")
	require.NoError(t, err)

	go func(ln net.Listener, attemptc chan<- int) {
		attempts := 0

		for {
			conn, err := ln.Accept()
			require.NoError(t, err)

			err = conn.Close()
			require.NoError(t, err)

			attempts++

			if attempts == retries {
				attemptc <- attempts
				break
			}
		}
	}(ln, attemptc)

	rs := NewRemoteSigner(
		log.TestingLogger(),
		cmn.RandStr(12),
		types.NewMockPV(),
		DialTCPFn(ln.Addr().String(), testConnDeadline, ed25519.GenPrivKey()),
	)
	defer rs.Stop()

	RemoteSignerConnDeadline(time.Millisecond)(rs)
	RemoteSignerConnRetries(retries)(rs)

	assert.Equal(t, rs.Start(), ErrDialRetryMax)

	select {
	case attempts := <-attemptc:
		assert.Equal(t, retries, attempts)
	case <-time.After(100 * time.Millisecond):
		t.Error("expected remote to observe connection attempts")
	}
}

func TestIsConnTimeoutForFundamentalTimeouts(t *testing.T) {
	// Generate a networking timeout
	dialer := DialTCPFn(testFreeTCPAddr(t), time.Millisecond, ed25519.GenPrivKey())
	_, err := dialer()
	assert.Error(t, err)
	assert.True(t, IsConnTimeout(err))
}

func TestIsConnTimeoutForWrappedConnTimeouts(t *testing.T) {
	dialer := DialTCPFn(testFreeTCPAddr(t), time.Millisecond, ed25519.GenPrivKey())
	_, err := dialer()
	assert.Error(t, err)
	err = cmn.ErrorWrap(ErrConnTimeout, err.Error())
	assert.True(t, IsConnTimeout(err))
}

func TestIsConnTimeoutForNonTimeoutErrors(t *testing.T) {
	assert.False(t, IsConnTimeout(cmn.ErrorWrap(ErrDialRetryMax, "max retries exceeded")))
	assert.False(t, IsConnTimeout(errors.New("completely irrelevant error")))
}