package rtsp

import (
	"context"
	"crypto/tls"
	"os"
	"testing"
	"time"

	"github.com/bluenviron/gortsplib/v4"
	"github.com/bluenviron/gortsplib/v4/pkg/auth"
	"github.com/bluenviron/gortsplib/v4/pkg/base"
	"github.com/bluenviron/gortsplib/v4/pkg/description"
	"github.com/pion/rtp"
	"github.com/stretchr/testify/require"

	"github.com/bluenviron/mediamtx/internal/conf"
	"github.com/bluenviron/mediamtx/internal/defs"
	"github.com/bluenviron/mediamtx/internal/test"
)

type testServer struct {
	onDescribe func(*gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error)
	onSetup    func(*gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error)
	onPlay     func(*gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error)
}

func (sh *testServer) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx,
) (*base.Response, *gortsplib.ServerStream, error) {
	return sh.onDescribe(ctx)
}

func (sh *testServer) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
	return sh.onSetup(ctx)
}

func (sh *testServer) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
	return sh.onPlay(ctx)
}

func TestSource(t *testing.T) {
	for _, source := range []string{
		"udp",
		"tcp",
		"tls",
	} {
		t.Run(source, func(t *testing.T) {
			var strm *gortsplib.ServerStream

			nonce, err := auth.GenerateNonce()
			require.NoError(t, err)

			media0 := test.UniqueMediaH264()

			s := gortsplib.Server{
				Handler: &testServer{
					onDescribe: func(ctx *gortsplib.ServerHandlerOnDescribeCtx,
					) (*base.Response, *gortsplib.ServerStream, error) {
						err2 := auth.Verify(ctx.Request, "testuser", "testpass", nil, "IPCAM", nonce)
						if err2 != nil {
							return &base.Response{ //nolint:nilerr
								StatusCode: base.StatusUnauthorized,
								Header: base.Header{
									"WWW-Authenticate": auth.GenerateWWWAuthenticate(nil, "IPCAM", nonce),
								},
							}, nil, nil
						}

						return &base.Response{
							StatusCode: base.StatusOK,
						}, strm, nil
					},
					onSetup: func(_ *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
						return &base.Response{
							StatusCode: base.StatusOK,
						}, strm, nil
					},
					onPlay: func(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
						go func() {
							time.Sleep(100 * time.Millisecond)
							err2 := strm.WritePacketRTP(media0, &rtp.Packet{
								Header: rtp.Header{
									Version:        0x02,
									PayloadType:    96,
									SequenceNumber: 57899,
									Timestamp:      345234345,
									SSRC:           978651231,
									Marker:         true,
								},
								Payload: []byte{5, 1, 2, 3, 4},
							})
							require.NoError(t, err2)
						}()

						return &base.Response{
							StatusCode: base.StatusOK,
						}, nil
					},
				},
				RTSPAddress: "127.0.0.1:8555",
			}

			switch source {
			case "udp":
				s.UDPRTPAddress = "127.0.0.1:8002"
				s.UDPRTCPAddress = "127.0.0.1:8003"

			case "tls":
				var serverCertFpath string
				serverCertFpath, err = test.CreateTempFile(test.TLSCertPub)
				require.NoError(t, err)
				defer os.Remove(serverCertFpath)

				var serverKeyFpath string
				serverKeyFpath, err = test.CreateTempFile(test.TLSCertKey)
				require.NoError(t, err)
				defer os.Remove(serverKeyFpath)

				var cert tls.Certificate
				cert, err = tls.LoadX509KeyPair(serverCertFpath, serverKeyFpath)
				require.NoError(t, err)

				s.TLSConfig = &tls.Config{Certificates: []tls.Certificate{cert}}
			}

			err = s.Start()
			require.NoError(t, err)
			defer s.Close()

			strm = &gortsplib.ServerStream{
				Server: &s,
				Desc:   &description.Session{Medias: []*description.Media{media0}},
			}
			err = strm.Initialize()
			require.NoError(t, err)
			defer strm.Close()

			var ur string
			var cnf *conf.Path

			if source != "tls" {
				ur = "rtsp://testuser:testpass@localhost:8555/teststream"
				var sp conf.RTSPTransport
				sp.UnmarshalJSON([]byte(`"` + source + `"`)) //nolint:errcheck
				cnf = &conf.Path{
					RTSPTransport: sp,
				}
			} else {
				ur = "rtsps://testuser:testpass@localhost:8555/teststream"
				cnf = &conf.Path{
					SourceFingerprint: "33949E05FFFB5FF3E8AA16F8213A6251B4D9363804BA53233C4DA9A46D6F2739",
				}
			}

			p := &test.StaticSourceParent{}
			p.Initialize()
			defer p.Close()

			so := &Source{
				ReadTimeout:    conf.Duration(10 * time.Second),
				WriteTimeout:   conf.Duration(10 * time.Second),
				WriteQueueSize: 2048,
				Parent:         p,
			}

			done := make(chan struct{})
			defer func() { <-done }()

			ctx, ctxCancel := context.WithCancel(context.Background())
			defer ctxCancel()

			reloadConf := make(chan *conf.Path)

			go func() {
				so.Run(defs.StaticSourceRunParams{ //nolint:errcheck
					Context:        ctx,
					ResolvedSource: ur,
					Conf:           cnf,
					ReloadConf:     reloadConf,
				})
				close(done)
			}()

			<-p.Unit

			// the source must be listening on ReloadConf
			reloadConf <- nil
		})
	}
}

func TestSourceNoPassword(t *testing.T) {
	var strm *gortsplib.ServerStream

	nonce, err := auth.GenerateNonce()
	require.NoError(t, err)

	media0 := test.UniqueMediaH264()

	s := gortsplib.Server{
		Handler: &testServer{
			onDescribe: func(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
				err2 := auth.Verify(ctx.Request, "testuser", "", nil, "IPCAM", nonce)
				if err2 != nil {
					return &base.Response{ //nolint:nilerr
						StatusCode: base.StatusUnauthorized,
						Header: base.Header{
							"WWW-Authenticate": auth.GenerateWWWAuthenticate(nil, "IPCAM", nonce),
						},
					}, nil, nil
				}

				return &base.Response{
					StatusCode: base.StatusOK,
				}, strm, nil
			},
			onSetup: func(_ *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
				go func() {
					time.Sleep(100 * time.Millisecond)
					err2 := strm.WritePacketRTP(media0, &rtp.Packet{
						Header: rtp.Header{
							Version:        0x02,
							PayloadType:    96,
							SequenceNumber: 57899,
							Timestamp:      345234345,
							SSRC:           978651231,
							Marker:         true,
						},
						Payload: []byte{5, 1, 2, 3, 4},
					})
					require.NoError(t, err2)
				}()

				return &base.Response{
					StatusCode: base.StatusOK,
				}, strm, nil
			},
			onPlay: func(_ *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
				return &base.Response{
					StatusCode: base.StatusOK,
				}, nil
			},
		},
		RTSPAddress: "127.0.0.1:8555",
	}

	err = s.Start()
	require.NoError(t, err)
	defer s.Close()

	strm = &gortsplib.ServerStream{
		Server: &s,
		Desc:   &description.Session{Medias: []*description.Media{media0}},
	}
	err = strm.Initialize()
	require.NoError(t, err)
	defer strm.Close()

	var sp conf.RTSPTransport
	sp.UnmarshalJSON([]byte(`"tcp"`)) //nolint:errcheck

	p := &test.StaticSourceParent{}
	p.Initialize()
	defer p.Close()

	so := &Source{
		ReadTimeout:    conf.Duration(10 * time.Second),
		WriteTimeout:   conf.Duration(10 * time.Second),
		WriteQueueSize: 2048,
		Parent:         p,
	}

	done := make(chan struct{})
	defer func() { <-done }()

	ctx, ctxCancel := context.WithCancel(context.Background())
	defer ctxCancel()

	go func() {
		so.Run(defs.StaticSourceRunParams{ //nolint:errcheck
			Context:        ctx,
			ResolvedSource: "rtsp://testuser:@127.0.0.1:8555/teststream",
			Conf: &conf.Path{
				RTSPTransport: sp,
			},
		})
		close(done)
	}()

	<-p.Unit
}

func TestSourceRange(t *testing.T) {
	for _, ca := range []string{"clock", "npt", "smpte"} {
		t.Run(ca, func(t *testing.T) {
			var strm *gortsplib.ServerStream

			media0 := test.UniqueMediaH264()

			s := gortsplib.Server{
				Handler: &testServer{
					onDescribe: func(_ *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
						return &base.Response{
							StatusCode: base.StatusOK,
						}, strm, nil
					},
					onSetup: func(_ *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
						return &base.Response{
							StatusCode: base.StatusOK,
						}, strm, nil
					},
					onPlay: func(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
						switch ca {
						case "clock":
							require.Equal(t, base.HeaderValue{"clock=20230812T120000Z-"}, ctx.Request.Header["Range"])

						case "npt":
							require.Equal(t, base.HeaderValue{"npt=0.35-"}, ctx.Request.Header["Range"])

						case "smpte":
							require.Equal(t, base.HeaderValue{"smpte=0:02:10-"}, ctx.Request.Header["Range"])
						}

						go func() {
							time.Sleep(100 * time.Millisecond)
							err := strm.WritePacketRTP(media0, &rtp.Packet{
								Header: rtp.Header{
									Version:        0x02,
									PayloadType:    96,
									SequenceNumber: 57899,
									Timestamp:      345234345,
									SSRC:           978651231,
									Marker:         true,
								},
								Payload: []byte{5, 1, 2, 3, 4},
							})
							require.NoError(t, err)
						}()

						return &base.Response{
							StatusCode: base.StatusOK,
						}, nil
					},
				},
				RTSPAddress: "127.0.0.1:8555",
			}

			err := s.Start()
			require.NoError(t, err)
			defer s.Close()

			strm = &gortsplib.ServerStream{
				Server: &s,
				Desc:   &description.Session{Medias: []*description.Media{media0}},
			}
			err = strm.Initialize()
			require.NoError(t, err)
			defer strm.Close()

			cnf := &conf.Path{}

			switch ca {
			case "clock":
				cnf.RTSPRangeType = conf.RTSPRangeTypeClock
				cnf.RTSPRangeStart = "20230812T120000Z"

			case "npt":
				cnf.RTSPRangeType = conf.RTSPRangeTypeNPT
				cnf.RTSPRangeStart = "350ms"

			case "smpte":
				cnf.RTSPRangeType = conf.RTSPRangeTypeSMPTE
				cnf.RTSPRangeStart = "130s"
			}

			p := &test.StaticSourceParent{}
			p.Initialize()
			defer p.Close()

			so := &Source{
				ReadTimeout:    conf.Duration(10 * time.Second),
				WriteTimeout:   conf.Duration(10 * time.Second),
				WriteQueueSize: 2048,
				Parent:         p,
			}

			done := make(chan struct{})
			defer func() { <-done }()

			ctx, ctxCancel := context.WithCancel(context.Background())
			defer ctxCancel()

			go func() {
				so.Run(defs.StaticSourceRunParams{ //nolint:errcheck
					Context:        ctx,
					ResolvedSource: "rtsp://127.0.0.1:8555/teststream",
					Conf:           cnf,
				})
				close(done)
			}()

			<-p.Unit
		})
	}
}