package scenarios

import (
	"context"
	"fmt"
	"io"
	"strings"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/types/known/anypb"

	core "github.com/v2fly/v2ray-core/v5"
	"github.com/v2fly/v2ray-core/v5/app/commander"
	"github.com/v2fly/v2ray-core/v5/app/policy"
	"github.com/v2fly/v2ray-core/v5/app/proxyman"
	"github.com/v2fly/v2ray-core/v5/app/proxyman/command"
	"github.com/v2fly/v2ray-core/v5/app/router"
	"github.com/v2fly/v2ray-core/v5/app/stats"
	statscmd "github.com/v2fly/v2ray-core/v5/app/stats/command"
	"github.com/v2fly/v2ray-core/v5/common"
	"github.com/v2fly/v2ray-core/v5/common/net"
	"github.com/v2fly/v2ray-core/v5/common/protocol"
	"github.com/v2fly/v2ray-core/v5/common/serial"
	"github.com/v2fly/v2ray-core/v5/common/uuid"
	"github.com/v2fly/v2ray-core/v5/proxy/dokodemo"
	"github.com/v2fly/v2ray-core/v5/proxy/freedom"
	"github.com/v2fly/v2ray-core/v5/proxy/vmess"
	"github.com/v2fly/v2ray-core/v5/proxy/vmess/inbound"
	"github.com/v2fly/v2ray-core/v5/proxy/vmess/outbound"
	"github.com/v2fly/v2ray-core/v5/testing/servers/tcp"
)

func TestCommanderRemoveHandler(t *testing.T) {
	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	common.Must(err)
	defer tcpServer.Close()

	clientPort := tcp.PickPort()
	cmdPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*anypb.Any{
			serial.ToTypedMessage(&commander.Config{
				Tag: "api",
				Service: []*anypb.Any{
					serial.ToTypedMessage(&command.Config{}),
				},
			}),
			serial.ToTypedMessage(&router.Config{
				Rule: []*router.RoutingRule{
					{
						InboundTag: []string{"api"},
						TargetTag: &router.RoutingRule_Tag{
							Tag: "api",
						},
					},
				},
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				Tag: "d",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address:  net.NewIPOrDomain(dest.Address),
					Port:     uint32(dest.Port),
					Networks: []net.Network{net.Network_TCP},
				}),
			},
			{
				Tag: "api",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(cmdPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address:  net.NewIPOrDomain(dest.Address),
					Port:     uint32(dest.Port),
					Networks: []net.Network{net.Network_TCP},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				Tag:           "default-outbound",
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	servers, err := InitializeServerConfigs(clientConfig)
	common.Must(err)
	defer CloseAllServers(servers)

	if err := testTCPConn(clientPort, 1024, time.Second*5)(); err != nil {
		t.Fatal(err)
	}

	cmdConn, err := grpc.Dial(fmt.Sprintf("127.0.0.1:%d", cmdPort), grpc.WithInsecure(), grpc.WithBlock())
	common.Must(err)
	defer cmdConn.Close()

	hsClient := command.NewHandlerServiceClient(cmdConn)
	resp, err := hsClient.RemoveInbound(context.Background(), &command.RemoveInboundRequest{
		Tag: "d",
	})
	common.Must(err)
	if resp == nil {
		t.Error("unexpected nil response")
	}

	{
		_, err := net.DialTCP("tcp", nil, &net.TCPAddr{
			IP:   []byte{127, 0, 0, 1},
			Port: int(clientPort),
		})
		if err == nil {
			t.Error("unexpected nil error")
		}
	}
}

func TestCommanderAddRemoveUser(t *testing.T) {
	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	common.Must(err)
	defer tcpServer.Close()

	u1 := protocol.NewID(uuid.New())
	u2 := protocol.NewID(uuid.New())

	cmdPort := tcp.PickPort()
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*anypb.Any{
			serial.ToTypedMessage(&commander.Config{
				Tag: "api",
				Service: []*anypb.Any{
					serial.ToTypedMessage(&command.Config{}),
				},
			}),
			serial.ToTypedMessage(&router.Config{
				Rule: []*router.RoutingRule{
					{
						InboundTag: []string{"api"},
						TargetTag: &router.RoutingRule_Tag{
							Tag: "api",
						},
					},
				},
			}),
			serial.ToTypedMessage(&policy.Config{
				Level: map[uint32]*policy.Policy{
					0: {
						Timeout: &policy.Policy_Timeout{
							UplinkOnly:   &policy.Second{Value: 0},
							DownlinkOnly: &policy.Second{Value: 0},
						},
					},
				},
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				Tag: "v",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      u1.String(),
								AlterId: 0,
							}),
						},
					},
				}),
			},
			{
				Tag: "api",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(cmdPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address:  net.NewIPOrDomain(dest.Address),
					Port:     uint32(dest.Port),
					Networks: []net.Network{net.Network_TCP},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*anypb.Any{
			serial.ToTypedMessage(&policy.Config{
				Level: map[uint32]*policy.Policy{
					0: {
						Timeout: &policy.Policy_Timeout{
							UplinkOnly:   &policy.Second{Value: 0},
							DownlinkOnly: &policy.Second{Value: 0},
						},
					},
				},
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				Tag: "d",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      u2.String(),
										AlterId: 0,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	common.Must(err)
	defer CloseAllServers(servers)

	if err := testTCPConn(clientPort, 1024, time.Second*5)(); err != io.EOF &&
		/*We might wish to drain the connection*/
		(err != nil && !strings.HasSuffix(err.Error(), "i/o timeout")) {
		t.Fatal("expected error: ", err)
	}

	cmdConn, err := grpc.Dial(fmt.Sprintf("127.0.0.1:%d", cmdPort), grpc.WithInsecure(), grpc.WithBlock())
	common.Must(err)
	defer cmdConn.Close()

	hsClient := command.NewHandlerServiceClient(cmdConn)
	resp, err := hsClient.AlterInbound(context.Background(), &command.AlterInboundRequest{
		Tag: "v",
		Operation: serial.ToTypedMessage(
			&command.AddUserOperation{
				User: &protocol.User{
					Email: "test@v2fly.org",
					Account: serial.ToTypedMessage(&vmess.Account{
						Id:      u2.String(),
						AlterId: 0,
					}),
				},
			}),
	})
	common.Must(err)
	if resp == nil {
		t.Fatal("nil response")
	}

	if err := testTCPConn(clientPort, 1024, time.Second*5)(); err != nil {
		t.Fatal(err)
	}

	resp, err = hsClient.AlterInbound(context.Background(), &command.AlterInboundRequest{
		Tag:       "v",
		Operation: serial.ToTypedMessage(&command.RemoveUserOperation{Email: "test@v2fly.org"}),
	})
	common.Must(err)
	if resp == nil {
		t.Fatal("nil response")
	}
}

func TestCommanderStats(t *testing.T) {
	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	common.Must(err)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	cmdPort := tcp.PickPort()

	serverConfig := &core.Config{
		App: []*anypb.Any{
			serial.ToTypedMessage(&stats.Config{}),
			serial.ToTypedMessage(&commander.Config{
				Tag: "api",
				Service: []*anypb.Any{
					serial.ToTypedMessage(&statscmd.Config{}),
				},
			}),
			serial.ToTypedMessage(&router.Config{
				Rule: []*router.RoutingRule{
					{
						InboundTag: []string{"api"},
						TargetTag: &router.RoutingRule_Tag{
							Tag: "api",
						},
					},
				},
			}),
			serial.ToTypedMessage(&policy.Config{
				Level: map[uint32]*policy.Policy{
					0: {
						Timeout: &policy.Policy_Timeout{
							UplinkOnly:   &policy.Second{Value: 0},
							DownlinkOnly: &policy.Second{Value: 0},
						},
					},
					1: {
						Stats: &policy.Policy_Stats{
							UserUplink:   true,
							UserDownlink: true,
						},
					},
				},
				System: &policy.SystemPolicy{
					Stats: &policy.SystemPolicy_Stats{
						InboundUplink: true,
					},
				},
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				Tag: "vmess",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Level: 1,
							Email: "test",
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 0,
							}),
						},
					},
				}),
			},
			{
				Tag: "api",
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(cmdPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 0,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	if err != nil {
		t.Fatal("Failed to create all servers", err)
	}
	defer CloseAllServers(servers)

	if err := testTCPConn(clientPort, 10240*1024, time.Second*20)(); err != nil {
		t.Fatal(err)
	}

	cmdConn, err := grpc.Dial(fmt.Sprintf("127.0.0.1:%d", cmdPort), grpc.WithInsecure(), grpc.WithBlock())
	common.Must(err)
	defer cmdConn.Close()

	const name = "user>>>test>>>traffic>>>uplink"
	sClient := statscmd.NewStatsServiceClient(cmdConn)

	sresp, err := sClient.GetStats(context.Background(), &statscmd.GetStatsRequest{
		Name:   name,
		Reset_: true,
	})
	common.Must(err)
	if r := cmp.Diff(sresp.Stat, &statscmd.Stat{
		Name:  name,
		Value: 10240 * 1024,
	}, cmpopts.IgnoreUnexported(statscmd.Stat{})); r != "" {
		t.Error(r)
	}

	sresp, err = sClient.GetStats(context.Background(), &statscmd.GetStatsRequest{
		Name: name,
	})
	common.Must(err)
	if r := cmp.Diff(sresp.Stat, &statscmd.Stat{
		Name:  name,
		Value: 0,
	}, cmpopts.IgnoreUnexported(statscmd.Stat{})); r != "" {
		t.Error(r)
	}

	sresp, err = sClient.GetStats(context.Background(), &statscmd.GetStatsRequest{
		Name:   "inbound>>>vmess>>>traffic>>>uplink",
		Reset_: true,
	})
	common.Must(err)
	if sresp.Stat.Value <= 10240*1024 {
		t.Error("value < 10240*1024: ", sresp.Stat.Value)
	}
}