// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

package client

import (
	"net"
	"testing"
	"time"

	"github.com/pion/logging"
	"github.com/pion/stun/v3"
	"github.com/pion/transport/v3"
	"github.com/pion/turn/v4/internal/proto"
	"github.com/stretchr/testify/assert"
)

type dummyTCPConn struct {
	transport.TCPConn
}

func buildMsg(transactionID [stun.TransactionIDSize]byte, msgType stun.MessageType, additional ...stun.Setter) []stun.Setter {
	return append([]stun.Setter{&stun.Message{TransactionID: transactionID}, msgType}, additional...)
}

func (c dummyTCPConn) Write(b []byte) (int, error) {
	return len(b), nil
}

func (c dummyTCPConn) Read(b []byte) (int, error) {
	transactionID := [stun.TransactionIDSize]byte{1, 2, 3}
	messageType := stun.MessageType{Method: stun.MethodConnectionBind, Class: stun.ClassSuccessResponse}
	attrs := buildMsg(transactionID, messageType)
	msg, err := stun.Build(attrs...)
	if err != nil {
		return 0, err
	}

	copy(b, msg.Raw)
	return len(msg.Raw), nil
}

func TestTCPConn(t *testing.T) {
	t.Run("Connect()", func(t *testing.T) {
		var cid proto.ConnectionID = 5
		client := &mockClient{
			performTransaction: func(msg *stun.Message, _ net.Addr, _ bool) (TransactionResult, error) {
				if msg.Type.Class == stun.ClassRequest && msg.Type.Method == stun.MethodConnect {
					msg, err := stun.Build(
						stun.TransactionID,
						stun.NewType(stun.MethodConnect, stun.ClassSuccessResponse),
						cid,
					)
					assert.NoError(t, err)
					return TransactionResult{Msg: msg}, nil
				}
				return TransactionResult{}, errFake
			},
		}

		addr := &net.TCPAddr{
			IP:   net.ParseIP("127.0.0.1"),
			Port: 1234,
		}

		pm := newPermissionMap()
		assert.True(t, pm.insert(addr, &permission{
			st: permStatePermitted,
		}))

		loggerFactory := logging.NewDefaultLoggerFactory()
		log := loggerFactory.NewLogger("test")
		alloc := TCPAllocation{
			allocation: allocation{
				client:  client,
				permMap: pm,
				log:     log,
			},
		}

		actualCid, err := alloc.Connect(addr)
		assert.NoError(t, err)
		assert.Equal(t, cid, actualCid)

		client = &mockClient{
			performTransaction: func(msg *stun.Message, _ net.Addr, _ bool) (TransactionResult, error) {
				if msg.Type.Class == stun.ClassRequest && msg.Type.Method == stun.MethodConnect {
					msg, err = stun.Build(
						stun.TransactionID,
						stun.NewType(stun.MethodConnect, stun.ClassErrorResponse),
						stun.ErrorCodeAttribute{Code: stun.CodeBadRequest},
					)
					assert.NoError(t, err)
					return TransactionResult{Msg: msg}, nil
				}
				return TransactionResult{}, errFake
			},
		}
		alloc = TCPAllocation{
			allocation: allocation{
				client:  client,
				permMap: pm,
				log:     log,
			},
		}

		_, err = alloc.Connect(addr)
		assert.ErrorContains(t, err, "Connect error response", "error 400")
	})

	t.Run("SetDeadline()", func(t *testing.T) {
		relayedAddr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:13478")
		assert.NoError(t, err)

		loggerFactory := logging.NewDefaultLoggerFactory()

		alloc := NewTCPAllocation(&AllocationConfig{
			Client:      &mockClient{},
			Lifetime:    time.Second,
			Log:         loggerFactory.NewLogger("test"),
			RelayedAddr: relayedAddr,
		})

		err = alloc.SetDeadline(time.Now())
		assert.NoError(t, err)

		cid, err := alloc.AcceptTCPWithConn(nil)
		assert.Nil(t, cid)
		assert.Contains(t, err.Error(), "i/o timeout")
	})

	t.Run("AcceptTCPWithConn()", func(t *testing.T) {
		relayedAddr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:13478")
		assert.NoError(t, err)

		loggerFactory := logging.NewDefaultLoggerFactory()
		alloc := NewTCPAllocation(&AllocationConfig{
			Client:      &mockClient{},
			Lifetime:    time.Second,
			Log:         loggerFactory.NewLogger("test"),
			RelayedAddr: relayedAddr,
		})

		from, err := net.ResolveTCPAddr("tcp", "127.0.0.1:11111")
		var cid proto.ConnectionID = 5
		assert.NoError(t, err)
		alloc.HandleConnectionAttempt(from, cid)

		conn := dummyTCPConn{}
		dataConn, err := alloc.AcceptTCPWithConn(conn)
		assert.Equal(t, cid, dataConn.ConnectionID)
		assert.NoError(t, err)
	})

	t.Run("DialWithConn()", func(t *testing.T) {
		relayedAddr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:13478")
		assert.NoError(t, err)

		var cid proto.ConnectionID = 5
		loggerFactory := logging.NewDefaultLoggerFactory()
		client := &mockClient{
			performTransaction: func(msg *stun.Message, _ net.Addr, _ bool) (TransactionResult, error) {
				typ := stun.NewType(stun.MethodConnect, stun.ClassSuccessResponse)
				if msg.Type.Method == stun.MethodCreatePermission {
					typ = stun.NewType(stun.MethodCreatePermission, stun.ClassSuccessResponse)
				}

				msg, err = stun.Build(
					stun.TransactionID,
					typ,
					cid,
				)
				assert.NoError(t, err)
				return TransactionResult{Msg: msg}, nil
			},
		}
		alloc := NewTCPAllocation(&AllocationConfig{
			Client:      client,
			Lifetime:    time.Second,
			Log:         loggerFactory.NewLogger("test"),
			RelayedAddr: relayedAddr,
		})

		conn := dummyTCPConn{}
		dataConn, err := alloc.DialWithConn(conn, "tcp", "127.0.0.1:11111")
		assert.Equal(t, cid, dataConn.ConnectionID)
		assert.NoError(t, err)
	})
}