package protocol7

import (
	"slices"
	"testing"

	"github.com/teeworlds-go/go-teeworlds-protocol/chunk7"
	"github.com/teeworlds-go/go-teeworlds-protocol/internal/testutils/require"
	"github.com/teeworlds-go/go-teeworlds-protocol/messages7"
)

// repack packet with unknown messages should not lose data

func TestRepackUnknownMessages(t *testing.T) {
	// TODO: once 9e220138-d393-3cb0-90f1-e587c00ab1d0
	//       is supported this test makes no sense anymore
	//       because if the entire ddnet protocol is implemeted this dump does
	//       not contain an unknown message anymore
	//       to fix this add a custom unused uuid ddnet msg and or a unused teeworlds msg id

	// libtw2 dissector dump of ddnet7 connecting to official ddnet server
	// Teeworlds 0.7 Protocol packet
	// Teeworlds 0.7 Protocol chunk: game.sv_chat
	// Teeworlds 0.7 Protocol chunk: game.sv_chat
	// Teeworlds 0.7 Protocol chunk: game.sv_game_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info_remove
	// Teeworlds 0.7 Protocol chunk: game.9e220138-d393-3cb0-90f1-e587c00ab1d0
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info
	// Teeworlds 0.7 Protocol chunk: game.sv_command_info

	dump := []byte{
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		0x00,
	}

	conn := Session{}

	packet := Packet{}
	err := packet.Unpack(dump)
	require.NoError(t, err)

	conn.Ack = packet.Header.Ack
	repack := packet.Pack(&conn)
	require.Equal(t, dump, repack)
}

// update chunk headers

func TestPackUpdateChunkHeaders(t *testing.T) {
	// The chunk header is nil by default
	packet := Packet{}
	packet.Messages = append(packet.Messages, &messages7.SvChat{Message: "foo"})

	{
		got := packet.Messages[0].Header()
		require.NotNil(t, got)
	}

	// When packing the chunk header will be set automatically
	// Based on the current context
	conn := &Session{Sequence: 1}
	_ = packet.Pack(conn)

	{
		got := packet.Messages[0].Header()
		want := &chunk7.ChunkHeader{
			Flags: chunk7.ChunkFlags{
				Vital: true,
			},
			Size: 8,
			Seq:  2,
		}
		require.Equal(t, want, got)
	}

	// When the chunk header is already set
	// Packing will only update the size

	var chat *messages7.SvChat
	var ok bool
	if chat, ok = packet.Messages[0].(*messages7.SvChat); ok {
		chat.Message = "hello world"
		packet.Messages[0] = chat
	} else {
		t.Fatal("failed to cast chat message")
	}

	_ = packet.Pack(conn)

	{
		got := packet.Messages[0].Header()
		want := &chunk7.ChunkHeader{
			Flags: chunk7.ChunkFlags{
				Vital: true,
			},
			Size: 16,
			Seq:  2,
		}
		require.Equal(t, want, got)
	}
}

// pack header

func TestPackHeader(t *testing.T) {
	header := PacketHeader{
		Flags: PacketFlags{
			Connless:    false,
			Compression: false,
			Resend:      false,
			Control:     true,
		},
		Ack:       10,
		NumChunks: 0,
		Token:     [4]byte{0xcf, 0x2e, 0xde, 0x1d},
	}
	want := []byte{0x04, 0x0a, 0x00, 0xcf, 0x2e, 0xde, 0x1d}
	got := header.Pack()
	require.Equal(t, want, got)
}

// pack flags

func TestPackFlagsUnset(t *testing.T) {
	flags := PacketFlags{
		Connless:    false,
		Compression: false,
		Resend:      false,
		Control:     false,
	}

	want := []byte{0b0000}
	got := flags.Pack()
	require.Equal(t, want, got)
}

func TestPackFlagsCompressionSet(t *testing.T) {
	flags := PacketFlags{
		Connless:    false,
		Compression: true,
		Resend:      false,
		Control:     false,
	}

	want := []byte{0b0100}
	got := flags.Pack()
	require.Equal(t, want, got)
}

func TestPackFlagsAllSet(t *testing.T) {
	flags := PacketFlags{
		Connless:    true,
		Compression: true,
		Resend:      true,
		Control:     true,
	}

	want := []byte{0b1111}
	got := flags.Pack()
	require.Equal(t, want, got)
}

// unpack

func TestUnpackFlagsAllSet(t *testing.T) {
	want := PacketFlags{
		Connless:    true,
		Compression: true,
		Resend:      true,
		Control:     true,
	}
	got := PacketFlags{}
	err := got.Unpack([]byte{0b00111100})
	require.NoError(t, err)
	require.Equal(t, want, got)
}

func TestUnpackFlagsControlSet(t *testing.T) {
	want := PacketFlags{
		Connless:    false,
		Compression: false,
		Resend:      false,
		Control:     true,
	}
	got := PacketFlags{}

	err := got.Unpack([]byte{0b00000100})
	require.NoError(t, err)
	require.Equal(t, want, got)
}

func TestUnpackFlagsUnset(t *testing.T) {
	want := PacketFlags{
		Connless:    false,
		Compression: false,
		Resend:      false,
		Control:     false,
	}

	got := PacketFlags{}
	err := got.Unpack([]byte{0b00000000})
	require.NoError(t, err)
	require.Equal(t, want, got)
}

// packet header unpack

func TestUnpackCloseWithReason(t *testing.T) {
	want := PacketHeader{
		Flags: PacketFlags{
			Connless:    false,
			Compression: false,
			Resend:      false,
			Control:     true,
		},
		Ack:       10,
		NumChunks: 0,
		Token:     [4]byte{0xcf, 0x2e, 0xde, 0x1d},
	}

	got := PacketHeader{}
	err := got.Unpack(slices.Concat(
		[]byte{0x04, 0x0a, 0x00, 0xcf, 0x2e, 0xde, 0x1d, 0x04},
		[]byte("shutdown"),
		[]byte{0x00},
	))
	require.NoError(t, err)
	require.Equal(t, want, got)
}

func TestUnpackHeaderFlagsControlSet(t *testing.T) {
	want := PacketHeader{
		Flags: PacketFlags{
			Connless:    false,
			Compression: false,
			Resend:      false,
			Control:     true,
		},
		Ack:       0,
		NumChunks: 0,
		Token:     [4]byte{0xff, 0xff, 0xff, 0xff},
	}

	got := PacketHeader{}
	err := got.Unpack([]byte{0b00000100, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff})
	require.NoError(t, err)
	require.Equal(t, want, got)
}

func TestUnpackHeaderFlagsAllSet(t *testing.T) {
	want := PacketHeader{
		Flags: PacketFlags{
			Connless:    true,
			Compression: true,
			Resend:      true,
			Control:     true,
		},
		Ack:       0,
		NumChunks: 0,
		Token:     [4]byte{0xff, 0xff, 0xff, 0xff},
	}

	got := PacketHeader{}
	err := got.Unpack([]byte{0b00111100, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff})
	require.NoError(t, err)
	require.Equal(t, want, got)
}