package rtpmpeg1video

import (
	"testing"

	"github.com/pion/rtp"
	"github.com/stretchr/testify/require"
)

func TestDecode(t *testing.T) {
	for _, ca := range cases {
		t.Run(ca.name, func(t *testing.T) {
			d := &Decoder{}
			err := d.Init()
			require.NoError(t, err)

			var frame []byte

			for _, pkt := range ca.pkts {
				frame, err = d.Decode(pkt)
			}

			require.NoError(t, err)
			require.Equal(t, ca.frame, frame)
		})
	}
}

func TestDecodeErrorMissingPacket(t *testing.T) {
	d := &Decoder{}
	err := d.Init()
	require.NoError(t, err)

	_, err = d.Decode(&rtp.Packet{
		Header: rtp.Header{
			Version:        2,
			Marker:         false,
			PayloadType:    96,
			SequenceNumber: 17645,
			SSRC:           0x9dbb7812,
		},
		Payload: []byte{0, 0, 0x10, 0, 0, 0, 1},
	})
	require.Equal(t, ErrMorePacketsNeeded, err)

	_, err = d.Decode(&rtp.Packet{
		Header: rtp.Header{
			Version:        2,
			Marker:         false,
			PayloadType:    96,
			SequenceNumber: 17647,
			SSRC:           0x9dbb7812,
		},
		Payload: []byte{0, 0, 0x08, 0},
	})
	require.EqualError(t, err, "discarding frame since a RTP packet is missing")
}

func FuzzDecoder(f *testing.F) {
	f.Fuzz(func(_ *testing.T, a []byte, b []byte) {
		d := &Decoder{}
		d.Init() //nolint:errcheck

		d.Decode(&rtp.Packet{ //nolint:errcheck
			Header: rtp.Header{
				Version:        2,
				SequenceNumber: 17645,
				Timestamp:      2289527317,
				SSRC:           0x9dbb7812,
			},
			Payload: a,
		})

		d.Decode(&rtp.Packet{ //nolint:errcheck
			Header: rtp.Header{
				Version:        2,
				SequenceNumber: 17646,
				Timestamp:      2289527317,
				SSRC:           0x9dbb7812,
			},
			Payload: b,
		})
	})
}