package core

import (
	"bufio"
	"context"
	"crypto/tls"
	"net"
	"net/http"
	"net/url"
	"os"
	"sync"
	"testing"
	"time"

	"github.com/bluenviron/gortsplib/v4"
	"github.com/bluenviron/gortsplib/v4/pkg/description"
	"github.com/bluenviron/gortsplib/v4/pkg/format"
	"github.com/bluenviron/mediacommon/pkg/formats/mpegts"
	srt "github.com/datarhei/gosrt"
	"github.com/pion/rtp"
	"github.com/stretchr/testify/require"

	"github.com/bluenviron/mediamtx/internal/protocols/rtmp"
	"github.com/bluenviron/mediamtx/internal/protocols/webrtc"
)

func TestMetrics(t *testing.T) {
	serverCertFpath, err := writeTempFile(serverCert)
	require.NoError(t, err)
	defer os.Remove(serverCertFpath)

	serverKeyFpath, err := writeTempFile(serverKey)
	require.NoError(t, err)
	defer os.Remove(serverKeyFpath)

	p, ok := newInstance("api: yes\n" +
		"hlsAlwaysRemux: yes\n" +
		"metrics: yes\n" +
		"webrtcServerCert: " + serverCertFpath + "\n" +
		"webrtcServerKey: " + serverKeyFpath + "\n" +
		"encryption: optional\n" +
		"serverCert: " + serverCertFpath + "\n" +
		"serverKey: " + serverKeyFpath + "\n" +
		"rtmpEncryption: optional\n" +
		"rtmpServerCert: " + serverCertFpath + "\n" +
		"rtmpServerKey: " + serverKeyFpath + "\n" +
		"paths:\n" +
		"  all_others:\n")
	require.Equal(t, true, ok)
	defer p.Close()

	hc := &http.Client{Transport: &http.Transport{}}

	t.Run("initial", func(t *testing.T) {
		bo := httpPullFile(t, hc, "http://localhost:9998/metrics")

		require.Equal(t, `paths 0
hls_muxers 0
hls_muxers_bytes_sent 0
rtsp_conns 0
rtsp_conns_bytes_received 0
rtsp_conns_bytes_sent 0
rtsp_sessions 0
rtsp_sessions_bytes_received 0
rtsp_sessions_bytes_sent 0
rtsps_conns 0
rtsps_conns_bytes_received 0
rtsps_conns_bytes_sent 0
rtsps_sessions 0
rtsps_sessions_bytes_received 0
rtsps_sessions_bytes_sent 0
rtmp_conns 0
rtmp_conns_bytes_received 0
rtmp_conns_bytes_sent 0
rtmps_conns 0
rtmps_conns_bytes_received 0
rtmps_conns_bytes_sent 0
srt_conns 0
srt_conns_bytes_received 0
srt_conns_bytes_sent 0
webrtc_sessions 0
webrtc_sessions_bytes_received 0
webrtc_sessions_bytes_sent 0
`, string(bo))
	})

	t.Run("with data", func(t *testing.T) {
		terminate := make(chan struct{})
		var wg sync.WaitGroup
		wg.Add(6)

		go func() {
			defer wg.Done()
			source := gortsplib.Client{}
			err := source.StartRecording("rtsp://localhost:8554/rtsp_path",
				&description.Session{Medias: []*description.Media{{
					Type:    description.MediaTypeVideo,
					Formats: []format.Format{testFormatH264},
				}}})
			require.NoError(t, err)
			defer source.Close()
			<-terminate
		}()

		go func() {
			defer wg.Done()
			source2 := gortsplib.Client{TLSConfig: &tls.Config{InsecureSkipVerify: true}}
			err := source2.StartRecording("rtsps://localhost:8322/rtsps_path",
				&description.Session{Medias: []*description.Media{{
					Type:    description.MediaTypeVideo,
					Formats: []format.Format{testFormatH264},
				}}})
			require.NoError(t, err)
			defer source2.Close()
			<-terminate
		}()

		go func() {
			defer wg.Done()
			u, err := url.Parse("rtmp://localhost:1935/rtmp_path")
			require.NoError(t, err)

			nconn, err := net.Dial("tcp", u.Host)
			require.NoError(t, err)
			defer nconn.Close()

			conn, err := rtmp.NewClientConn(nconn, u, true)
			require.NoError(t, err)

			_, err = rtmp.NewWriter(conn, testFormatH264, nil)
			require.NoError(t, err)
			<-terminate
		}()

		go func() {
			defer wg.Done()
			u, err := url.Parse("rtmp://localhost:1936/rtmps_path")
			require.NoError(t, err)

			nconn, err := tls.Dial("tcp", u.Host, &tls.Config{InsecureSkipVerify: true})
			require.NoError(t, err)
			defer nconn.Close() //nolint:errcheck

			conn, err := rtmp.NewClientConn(nconn, u, true)
			require.NoError(t, err)

			_, err = rtmp.NewWriter(conn, testFormatH264, nil)
			require.NoError(t, err)
			<-terminate
		}()

		go func() {
			defer wg.Done()

			su, err := url.Parse("http://localhost:8889/webrtc_path/whip")
			require.NoError(t, err)

			s := &webrtc.WHIPClient{
				HTTPClient: &http.Client{Transport: &http.Transport{}},
				URL:        su,
			}

			tracks, err := s.Publish(context.Background(), testMediaH264.Formats[0], nil)
			require.NoError(t, err)
			defer checkClose(t, s.Close)

			err = tracks[0].WriteRTP(&rtp.Packet{
				Header: rtp.Header{
					Version:        2,
					Marker:         true,
					PayloadType:    96,
					SequenceNumber: 123,
					Timestamp:      45343,
					SSRC:           563423,
				},
				Payload: []byte{1},
			})
			require.NoError(t, err)
			<-terminate
		}()

		go func() {
			defer wg.Done()

			srtConf := srt.DefaultConfig()
			address, err := srtConf.UnmarshalURL("srt://localhost:8890?streamid=publish:srt_path")
			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{
				{ // SPS
					0x67, 0x42, 0xc0, 0x28, 0xd9, 0x00, 0x78, 0x02,
					0x27, 0xe5, 0x84, 0x00, 0x00, 0x03, 0x00, 0x04,
					0x00, 0x00, 0x03, 0x00, 0xf0, 0x3c, 0x60, 0xc9,
					0x20,
				},
				{ // PPS
					0x08, 0x06, 0x07, 0x08,
				},
				{ // IDR
					0x05, 1,
				},
			})
			require.NoError(t, err)

			err = bw.Flush()
			require.NoError(t, err)
			<-terminate
		}()

		time.Sleep(500 * time.Millisecond)

		bo := httpPullFile(t, hc, "http://localhost:9998/metrics")

		require.Regexp(t,
			`^paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths\{name=".*?",state="ready"\} 1`+"\n"+
				`paths_bytes_received\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`paths_bytes_sent\{name=".*?",state="ready"\} [0-9]+`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`hls_muxers\{name=".*?"\} 1`+"\n"+
				`hls_muxers_bytes_sent\{name=".*?"\} 0`+"\n"+
				`rtsp_conns\{id=".*?"\} 1`+"\n"+
				`rtsp_conns_bytes_received\{id=".*?"\} [0-9]+`+"\n"+
				`rtsp_conns_bytes_sent\{id=".*?"\} [0-9]+`+"\n"+
				`rtsp_sessions\{id=".*?",state="publish"\} 1`+"\n"+
				`rtsp_sessions_bytes_received\{id=".*?",state="publish"\} 0`+"\n"+
				`rtsp_sessions_bytes_sent\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`rtsps_conns\{id=".*?"\} 1`+"\n"+
				`rtsps_conns_bytes_received\{id=".*?"\} [0-9]+`+"\n"+
				`rtsps_conns_bytes_sent\{id=".*?"\} [0-9]+`+"\n"+
				`rtsps_sessions\{id=".*?",state="publish"\} 1`+"\n"+
				`rtsps_sessions_bytes_received\{id=".*?",state="publish"\} 0`+"\n"+
				`rtsps_sessions_bytes_sent\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`rtmp_conns\{id=".*?",state="publish"\} 1`+"\n"+
				`rtmp_conns_bytes_received\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`rtmp_conns_bytes_sent\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`rtmps_conns\{id=".*?",state="publish"\} 1`+"\n"+
				`rtmps_conns_bytes_received\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`rtmps_conns_bytes_sent\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`srt_conns\{id=".*?",state="publish"\} 1`+"\n"+
				`srt_conns_bytes_received\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`srt_conns_bytes_sent\{id=".*?",state="publish"\} 0`+"\n"+
				`webrtc_sessions\{id=".*?",state="publish"\} 1`+"\n"+
				`webrtc_sessions_bytes_received\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				`webrtc_sessions_bytes_sent\{id=".*?",state="publish"\} [0-9]+`+"\n"+
				"$",
			string(bo))

		close(terminate)
		wg.Wait()
	})

	t.Run("servers deleted", func(t *testing.T) {
		httpRequest(t, hc, http.MethodPatch, "http://localhost:9997/v3/config/global/patch", map[string]interface{}{
			"rtsp":   false,
			"rtmp":   false,
			"srt":    false,
			"hls":    false,
			"webrtc": false,
		}, nil)

		time.Sleep(500 * time.Millisecond)

		bo := httpPullFile(t, hc, "http://localhost:9998/metrics")

		require.Equal(t, "paths 0\n", string(bo))
	})
}