package main

import (
	"bufio"
	"encoding/base64"
	"encoding/json"
	"net"
	"path/filepath"
	"testing"
)

func TestOpenWindowsEncodedSessionBindsDescriptorToRequest(t *testing.T) {
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer listener.Close()
	serverError := make(chan error, 1)
	go func() {
		connection, err := listener.Accept()
		if err != nil {
			serverError <- err
			return
		}
		defer connection.Close()
		if _, err := connection.Write([]byte("{\"kind\":\"windows_agent_hello\"}\n")); err != nil {
			serverError <- err
			return
		}
		var request struct {
			Kind                  string `json:"kind"`
			SessionID             string `json:"session_id"`
			FramesPerSecond       uint8  `json:"frames_per_second"`
			AllowSoftwareFallback bool   `json:"allow_software_fallback"`
		}
		if err := readBoundedAgentJSON(bufio.NewReader(connection), &request); err != nil {
			serverError <- err
			return
		}
		if request.Kind != "open_encoded_desktop" || request.SessionID != "session-1" || request.FramesPerSecond != 60 || !request.AllowSoftwareFallback {
			serverError <- &testControlError{"encoded desktop request mismatch"}
			return
		}
		response := encodedDesktopOpened{
			Kind: "encoded_desktop_opened", VideoCodec: "h264",
			MediaTransport: "shared_memory_encoded_access_units",
			Ring: mediaRingDescriptor{
				SchemaVersion: 1, SessionID: "session-1", Generation: 7, OwnerPID: 42,
				RingPath: filepath.Join(t.TempDir(), "media.ring"), SlotCount: 16,
				SlotBytes: 8 * 1024 * 1024, VideoTransport: "shared_memory_encoded_access_units",
				AudioTransport: "separate_transport",
			},
		}
		encoded, err := json.Marshal(response)
		if err == nil {
			encoded = append(encoded, '\n')
			_, err = connection.Write(encoded)
		}
		serverError <- err
	}()
	connection, descriptor, err := openWindowsEncodedSession(listener.Addr().String(), "session-1", 60, true)
	if err != nil {
		t.Fatal(err)
	}
	defer connection.Close()
	if descriptor.Generation != 7 || descriptor.SessionID != "session-1" {
		t.Fatalf("unexpected descriptor: %+v", descriptor)
	}
	if err := <-serverError; err != nil {
		t.Fatal(err)
	}
}

func TestWindowsAgentControlRejectsRemoteAndMismatchedDescriptor(t *testing.T) {
	if validateAgentControlAddress("192.0.2.10:39501") == nil {
		t.Fatal("remote Windows Agent control address was accepted")
	}
	descriptor := mediaRingDescriptor{
		SchemaVersion: 1, SessionID: "other", Generation: 1, OwnerPID: 1,
		RingPath: filepath.Join(t.TempDir(), "media.ring"), SlotCount: 16,
		SlotBytes: 1024, VideoTransport: "shared_memory_encoded_access_units",
		AudioTransport: "separate_transport",
	}
	if validateMediaRingDescriptor(descriptor, "session-1") == nil {
		t.Fatal("descriptor for another session was accepted")
	}
}

func TestWindowsAgentPipeAuthenticationMatchesRustWireVector(t *testing.T) {
	key := make([]byte, 32)
	nonce := make([]byte, 32)
	for index := range key {
		key[index] = byte(index)
		nonce[index] = byte(index + 32)
	}
	actual := base64.RawURLEncoding.EncodeToString(windowsAgentPipeMAC(key, nonce))
	const expected = "KinBDOBvVhz0eRv37iahq8BO0z8QdiI0Qnx7HZmcxIk"
	if actual != expected {
		t.Fatalf("unexpected Agent Pipe MAC: %s", actual)
	}
	if validateAgentControlAddress(`\\.\pipe\RemoteDesk\windows-agent`) != nil {
		t.Fatal("RemoteDesk Agent Pipe was rejected")
	}
	if validateAgentControlAddress(`\\.\pipe\Other\windows-agent`) == nil {
		t.Fatal("Pipe outside the RemoteDesk namespace was accepted")
	}
}

type testControlError struct{ message string }

func (e *testControlError) Error() string { return e.message }