package srt

import (
	"bufio"
	"testing"
	"time"

	"github.com/bluenviron/gortsplib/v4/pkg/description"
	"github.com/bluenviron/mediacommon/pkg/formats/mpegts"
	"github.com/bluenviron/mediamtx/internal/asyncwriter"
	"github.com/bluenviron/mediamtx/internal/auth"
	"github.com/bluenviron/mediamtx/internal/conf"
	"github.com/bluenviron/mediamtx/internal/defs"
	"github.com/bluenviron/mediamtx/internal/externalcmd"
	"github.com/bluenviron/mediamtx/internal/stream"
	"github.com/bluenviron/mediamtx/internal/test"
	"github.com/bluenviron/mediamtx/internal/unit"
	srt "github.com/datarhei/gosrt"
	"github.com/stretchr/testify/require"
)

type dummyPath struct {
	stream        *stream.Stream
	streamCreated chan struct{}
}

func (p *dummyPath) Name() string {
	return "teststream"
}

func (p *dummyPath) SafeConf() *conf.Path {
	return &conf.Path{}
}

func (p *dummyPath) ExternalCmdEnv() externalcmd.Environment {
	return externalcmd.Environment{}
}

func (p *dummyPath) StartPublisher(req defs.PathStartPublisherReq) (*stream.Stream, error) {
	var err error
	p.stream, err = stream.New(
		1460,
		req.Desc,
		true,
		test.NilLogger{},
	)
	if err != nil {
		return nil, err
	}
	close(p.streamCreated)
	return p.stream, nil
}

func (p *dummyPath) StopPublisher(_ defs.PathStopPublisherReq) {
}

func (p *dummyPath) RemovePublisher(_ defs.PathRemovePublisherReq) {
}

func (p *dummyPath) RemoveReader(_ defs.PathRemoveReaderReq) {
}

type dummyPathManager struct {
	path *dummyPath
}

func (pm *dummyPathManager) AddPublisher(req defs.PathAddPublisherReq) (defs.Path, error) {
	if req.AccessRequest.User != "myuser" || req.AccessRequest.Pass != "mypass" {
		return nil, auth.Error{}
	}
	return pm.path, nil
}

func (pm *dummyPathManager) AddReader(req defs.PathAddReaderReq) (defs.Path, *stream.Stream, error) {
	if req.AccessRequest.User != "myuser" || req.AccessRequest.Pass != "mypass" {
		return nil, nil, auth.Error{}
	}
	return pm.path, pm.path.stream, nil
}

func TestServerPublish(t *testing.T) {
	externalCmdPool := externalcmd.NewPool()
	defer externalCmdPool.Close()

	path := &dummyPath{
		streamCreated: make(chan struct{}),
	}

	pathManager := &dummyPathManager{path: path}

	s := &Server{
		Address:             "127.0.0.1:8890",
		RTSPAddress:         "",
		ReadTimeout:         conf.StringDuration(10 * time.Second),
		WriteTimeout:        conf.StringDuration(10 * time.Second),
		WriteQueueSize:      512,
		UDPMaxPayloadSize:   1472,
		RunOnConnect:        "",
		RunOnConnectRestart: false,
		RunOnDisconnect:     "string",
		ExternalCmdPool:     externalCmdPool,
		PathManager:         pathManager,
		Parent:              &test.NilLogger{},
	}
	err := s.Initialize()
	require.NoError(t, err)
	defer s.Close()

	u := "srt://localhost:8890?streamid=publish:mypath:myuser:mypass"

	srtConf := srt.DefaultConfig()
	address, err := srtConf.UnmarshalURL(u)
	require.NoError(t, err)

	err = srtConf.Validate()
	require.NoError(t, err)

	publisher, err := srt.Dial("srt", address, srtConf)
	require.NoError(t, err)
	defer publisher.Close()

	track := &mpegts.Track{
		Codec: &mpegts.CodecH264{},
	}

	bw := bufio.NewWriter(publisher)
	w := mpegts.NewWriter(bw, []*mpegts.Track{track})
	require.NoError(t, err)

	err = w.WriteH26x(track, 0, 0, true, [][]byte{
		test.FormatH264.SPS,
		test.FormatH264.PPS,
		{0x05, 1}, // IDR
	})
	require.NoError(t, err)

	err = bw.Flush()
	require.NoError(t, err)

	<-path.streamCreated

	aw := asyncwriter.New(512, &test.NilLogger{})

	recv := make(chan struct{})

	path.stream.AddReader(aw,
		path.stream.Desc().Medias[0],
		path.stream.Desc().Medias[0].Formats[0],
		func(u unit.Unit) error {
			require.Equal(t, [][]byte{
				test.FormatH264.SPS,
				test.FormatH264.PPS,
				{0x05, 1}, // IDR
			}, u.(*unit.H264).AU)
			close(recv)
			return nil
		})

	err = w.WriteH26x(track, 0, 0, true, [][]byte{
		{5, 2},
	})
	require.NoError(t, err)

	err = bw.Flush()
	require.NoError(t, err)

	aw.Start()
	<-recv
	aw.Stop()
}

func TestServerRead(t *testing.T) {
	externalCmdPool := externalcmd.NewPool()
	defer externalCmdPool.Close()

	desc := &description.Session{Medias: []*description.Media{test.MediaH264}}

	stream, err := stream.New(
		1460,
		desc,
		true,
		test.NilLogger{},
	)
	require.NoError(t, err)

	path := &dummyPath{stream: stream}

	pathManager := &dummyPathManager{path: path}

	s := &Server{
		Address:             "127.0.0.1:8890",
		RTSPAddress:         "",
		ReadTimeout:         conf.StringDuration(10 * time.Second),
		WriteTimeout:        conf.StringDuration(10 * time.Second),
		WriteQueueSize:      512,
		UDPMaxPayloadSize:   1472,
		RunOnConnect:        "",
		RunOnConnectRestart: false,
		RunOnDisconnect:     "string",
		ExternalCmdPool:     externalCmdPool,
		PathManager:         pathManager,
		Parent:              &test.NilLogger{},
	}
	err = s.Initialize()
	require.NoError(t, err)
	defer s.Close()

	u := "srt://localhost:8890?streamid=read:mypath:myuser:mypass"

	srtConf := srt.DefaultConfig()
	address, err := srtConf.UnmarshalURL(u)
	require.NoError(t, err)

	err = srtConf.Validate()
	require.NoError(t, err)

	reader, err := srt.Dial("srt", address, srtConf)
	require.NoError(t, err)
	defer reader.Close()

	stream.WriteUnit(desc.Medias[0], desc.Medias[0].Formats[0], &unit.H264{
		Base: unit.Base{
			NTP: time.Time{},
		},
		AU: [][]byte{
			{5, 1}, // IDR
		},
	})

	r, err := mpegts.NewReader(reader)
	require.NoError(t, err)

	require.Equal(t, []*mpegts.Track{{
		PID:   256,
		Codec: &mpegts.CodecH264{},
	}}, r.Tracks())

	received := false

	r.OnDataH26x(r.Tracks()[0], func(pts int64, dts int64, au [][]byte) error {
		require.Equal(t, int64(0), pts)
		require.Equal(t, int64(0), dts)
		require.Equal(t, [][]byte{
			test.FormatH264.SPS,
			test.FormatH264.PPS,
			{0x05, 1},
		}, au)
		received = true
		return nil
	})

	stream.WriteUnit(desc.Medias[0], desc.Medias[0].Formats[0], &unit.H264{
		Base: unit.Base{
			NTP: time.Time{},
		},
		AU: [][]byte{
			{5, 2},
		},
	})

	for {
		err = r.Read()
		require.NoError(t, err)
		if received {
			break
		}
	}
}