import crypto from "node:crypto";
import fs from "node:fs/promises";
import path from "node:path";

import type { CDPSession, Page } from "playwright-core";
import { devices as playwrightDevices } from "playwright-core";
import type { BrowserFormField } from "./client-actions-core.js";
import {
  buildRoleSnapshotFromAriaSnapshot,
  getRoleSnapshotStats,
  parseRoleRef,
  type RoleSnapshotOptions,
} from "./pw-role-snapshot.js";
import {
  type BrowserConsoleMessage,
  type BrowserNetworkRequest,
  type BrowserPageError,
  ensureContextState,
  ensurePageState,
  getPageForTargetId,
  refLocator,
  type WithSnapshotForAI,
} from "./pw-session.js";

let nextUploadArmId = 0;
let nextDialogArmId = 0;
let nextDownloadArmId = 0;

function requireRef(value: unknown): string {
  const raw = typeof value === "string" ? value.trim() : "";
  const roleRef = raw ? parseRoleRef(raw) : null;
  const ref = roleRef ?? (raw.startsWith("@") ? raw.slice(1) : raw);
  if (!ref) throw new Error("ref is required");
  return ref;
}

function buildTempDownloadPath(fileName: string): string {
  const id = crypto.randomUUID();
  const safeName = fileName.trim() ? fileName.trim() : "download.bin";
  return path.join("/tmp/clawdbot/downloads", `${id}-${safeName}`);
}

function normalizeTimeoutMs(timeoutMs: number | undefined, fallback: number) {
  return Math.max(500, Math.min(120_000, timeoutMs ?? fallback));
}

function createPageDownloadWaiter(page: Page, timeoutMs: number) {
  let done = false;
  let timer: NodeJS.Timeout | undefined;
  let handler: ((download: unknown) => void) | undefined;

  const cleanup = () => {
    if (timer) clearTimeout(timer);
    timer = undefined;
    if (handler) {
      page.off("download", handler as never);
      handler = undefined;
    }
  };

  const promise = new Promise<unknown>((resolve, reject) => {
    handler = (download: unknown) => {
      if (done) return;
      done = true;
      cleanup();
      resolve(download);
    };

    page.on("download", handler as never);
    timer = setTimeout(() => {
      if (done) return;
      done = true;
      cleanup();
      reject(new Error("Timeout waiting for download"));
    }, timeoutMs);
  });

  return {
    promise,
    cancel: () => {
      if (done) return;
      done = true;
      cleanup();
    },
  };
}

function matchUrlPattern(pattern: string, url: string): boolean {
  const p = pattern.trim();
  if (!p) return false;
  if (p === url) return true;
  if (p.includes("*")) {
    const escaped = p.replace(/[|\\{}()[\]^$+?.]/g, "\\$&");
    const regex = new RegExp(
      `^${escaped.replace(/\*\*/g, ".*").replace(/\*/g, ".*")}$`,
    );
    return regex.test(url);
  }
  return url.includes(p);
}

function toAIFriendlyError(error: unknown, selector: string): Error {
  const message = error instanceof Error ? error.message : String(error);

  if (message.includes("strict mode violation")) {
    const countMatch = message.match(/resolved to (\d+) elements/);
    const count = countMatch ? countMatch[1] : "multiple";
    return new Error(
      `Selector "${selector}" matched ${count} elements. ` +
        `Run a new snapshot to get updated refs, or use a different ref.`,
    );
  }

  if (
    (message.includes("Timeout") || message.includes("waiting for")) &&
    (message.includes("to be visible") || message.includes("not visible"))
  ) {
    return new Error(
      `Element "${selector}" not found or not visible. ` +
        `Run a new snapshot to see current page elements.`,
    );
  }

  if (
    message.includes("intercepts pointer events") ||
    message.includes("not visible") ||
    message.includes("not receive pointer events")
  ) {
    return new Error(
      `Element "${selector}" is not interactable (hidden or covered). ` +
        `Try scrolling it into view, closing overlays, or re-snapshotting.`,
    );
  }

  return error instanceof Error ? error : new Error(message);
}

export async function snapshotAiViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  timeoutMs?: number;
  maxChars?: number;
}): Promise<{ snapshot: string; truncated?: boolean }> {
  const page = await getPageForTargetId({
    cdpUrl: opts.cdpUrl,
    targetId: opts.targetId,
  });
  ensurePageState(page);

  const maybe = page as unknown as WithSnapshotForAI;
  if (!maybe._snapshotForAI) {
    throw new Error(
      "Playwright _snapshotForAI is not available. Upgrade playwright-core.",
    );
  }

  const result = await maybe._snapshotForAI({
    timeout: Math.max(
      500,
      Math.min(60_000, Math.floor(opts.timeoutMs ?? 5000)),
    ),
    track: "response",
  });
  let snapshot = String(result?.full ?? "");
  const maxChars = opts.maxChars;
  const limit =
    typeof maxChars === "number" && Number.isFinite(maxChars) && maxChars > 0
      ? Math.floor(maxChars)
      : undefined;
  if (limit && snapshot.length > limit) {
    snapshot = `${snapshot.slice(0, limit)}\n\n[...TRUNCATED - page too large]`;
    return { snapshot, truncated: true };
  }
  return { snapshot };
}

export async function snapshotRoleViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  selector?: string;
  frameSelector?: string;
  options?: RoleSnapshotOptions;
}): Promise<{
  snapshot: string;
  refs: Record<string, { role: string; name?: string; nth?: number }>;
  stats: { lines: number; chars: number; refs: number; interactive: number };
}> {
  const page = await getPageForTargetId({
    cdpUrl: opts.cdpUrl,
    targetId: opts.targetId,
  });
  const state = ensurePageState(page);

  const frameSelector = opts.frameSelector?.trim() || "";
  const selector = opts.selector?.trim() || "";
  const locator = frameSelector
    ? selector
      ? page.frameLocator(frameSelector).locator(selector)
      : page.frameLocator(frameSelector).locator(":root")
    : selector
      ? page.locator(selector)
      : page.locator(":root");

  const ariaSnapshot = await locator.ariaSnapshot();
  const built = buildRoleSnapshotFromAriaSnapshot(
    String(ariaSnapshot ?? ""),
    opts.options,
  );
  state.roleRefs = built.refs;
  state.roleRefsFrameSelector = frameSelector || undefined;
  return {
    snapshot: built.snapshot,
    refs: built.refs,
    stats: getRoleSnapshotStats(built.snapshot, built.refs),
  };
}

export async function getPageErrorsViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  clear?: boolean;
}): Promise<{ errors: BrowserPageError[] }> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const errors = [...state.errors];
  if (opts.clear) state.errors = [];
  return { errors };
}

export async function getNetworkRequestsViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  filter?: string;
  clear?: boolean;
}): Promise<{ requests: BrowserNetworkRequest[] }> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const raw = [...state.requests];
  const filter = typeof opts.filter === "string" ? opts.filter.trim() : "";
  const requests = filter ? raw.filter((r) => r.url.includes(filter)) : raw;
  if (opts.clear) {
    state.requests = [];
    state.requestIds = new WeakMap();
  }
  return { requests };
}

export async function highlightViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const ref = requireRef(opts.ref);
  try {
    await refLocator(page, ref).highlight();
  } catch (err) {
    throw toAIFriendlyError(err, ref);
  }
}

export async function traceStartViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  screenshots?: boolean;
  snapshots?: boolean;
  sources?: boolean;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  const context = page.context();
  const ctxState = ensureContextState(context);
  if (ctxState.traceActive) {
    throw new Error(
      "Trace already running. Stop the current trace before starting a new one.",
    );
  }
  await context.tracing.start({
    screenshots: opts.screenshots ?? true,
    snapshots: opts.snapshots ?? true,
    sources: opts.sources ?? false,
  });
  ctxState.traceActive = true;
}

export async function traceStopViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  path: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  const context = page.context();
  const ctxState = ensureContextState(context);
  if (!ctxState.traceActive) {
    throw new Error("No active trace. Start a trace before stopping it.");
  }
  await context.tracing.stop({ path: opts.path });
  ctxState.traceActive = false;
}

export async function clickViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
  doubleClick?: boolean;
  button?: "left" | "right" | "middle";
  modifiers?: Array<"Alt" | "Control" | "ControlOrMeta" | "Meta" | "Shift">;
  timeoutMs?: number;
}): Promise<void> {
  const page = await getPageForTargetId({
    cdpUrl: opts.cdpUrl,
    targetId: opts.targetId,
  });
  ensurePageState(page);
  const ref = requireRef(opts.ref);
  const locator = refLocator(page, ref);
  const timeout = Math.max(
    500,
    Math.min(60_000, Math.floor(opts.timeoutMs ?? 8000)),
  );
  try {
    if (opts.doubleClick) {
      await locator.dblclick({
        timeout,
        button: opts.button,
        modifiers: opts.modifiers,
      });
    } else {
      await locator.click({
        timeout,
        button: opts.button,
        modifiers: opts.modifiers,
      });
    }
  } catch (err) {
    throw toAIFriendlyError(err, ref);
  }
}

export async function hoverViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
  timeoutMs?: number;
}): Promise<void> {
  const ref = requireRef(opts.ref);
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  try {
    await refLocator(page, ref).hover({
      timeout: Math.max(500, Math.min(60_000, opts.timeoutMs ?? 8000)),
    });
  } catch (err) {
    throw toAIFriendlyError(err, ref);
  }
}

export async function dragViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  startRef: string;
  endRef: string;
  timeoutMs?: number;
}): Promise<void> {
  const startRef = requireRef(opts.startRef);
  const endRef = requireRef(opts.endRef);
  if (!startRef || !endRef) throw new Error("startRef and endRef are required");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  try {
    await refLocator(page, startRef).dragTo(refLocator(page, endRef), {
      timeout: Math.max(500, Math.min(60_000, opts.timeoutMs ?? 8000)),
    });
  } catch (err) {
    throw toAIFriendlyError(err, `${startRef} -> ${endRef}`);
  }
}

export async function selectOptionViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
  values: string[];
  timeoutMs?: number;
}): Promise<void> {
  const ref = requireRef(opts.ref);
  if (!opts.values?.length) throw new Error("values are required");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  try {
    await refLocator(page, ref).selectOption(opts.values, {
      timeout: Math.max(500, Math.min(60_000, opts.timeoutMs ?? 8000)),
    });
  } catch (err) {
    throw toAIFriendlyError(err, ref);
  }
}

export async function pressKeyViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  key: string;
  delayMs?: number;
}): Promise<void> {
  const key = String(opts.key ?? "").trim();
  if (!key) throw new Error("key is required");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.keyboard.press(key, {
    delay: Math.max(0, Math.floor(opts.delayMs ?? 0)),
  });
}

export async function cookiesGetViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
}): Promise<{ cookies: unknown[] }> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const cookies = await page.context().cookies();
  return { cookies };
}

export async function cookiesSetViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  cookie: {
    name: string;
    value: string;
    url?: string;
    domain?: string;
    path?: string;
    expires?: number;
    httpOnly?: boolean;
    secure?: boolean;
    sameSite?: "Lax" | "None" | "Strict";
  };
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const cookie = opts.cookie;
  if (!cookie.name || cookie.value === undefined) {
    throw new Error("cookie name and value are required");
  }
  const hasUrl = typeof cookie.url === "string" && cookie.url.trim();
  const hasDomainPath =
    typeof cookie.domain === "string" &&
    cookie.domain.trim() &&
    typeof cookie.path === "string" &&
    cookie.path.trim();
  if (!hasUrl && !hasDomainPath) {
    throw new Error("cookie requires url, or domain+path");
  }
  await page.context().addCookies([cookie]);
}

export async function cookiesClearViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.context().clearCookies();
}

type StorageKind = "local" | "session";

export async function storageGetViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  kind: StorageKind;
  key?: string;
}): Promise<{ values: Record<string, string> }> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const kind = opts.kind;
  const key = typeof opts.key === "string" ? opts.key : undefined;
  const values = await page.evaluate(
    ({ kind: kind2, key: key2 }) => {
      const store =
        kind2 === "session" ? window.sessionStorage : window.localStorage;
      if (key2) {
        const value = store.getItem(key2);
        return value === null ? {} : { [key2]: value };
      }
      const out: Record<string, string> = {};
      for (let i = 0; i < store.length; i += 1) {
        const k = store.key(i);
        if (!k) continue;
        const v = store.getItem(k);
        if (v !== null) out[k] = v;
      }
      return out;
    },
    { kind, key },
  );
  return { values: values ?? {} };
}

export async function storageSetViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  kind: StorageKind;
  key: string;
  value: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const key = String(opts.key ?? "");
  if (!key) throw new Error("key is required");
  await page.evaluate(
    ({ kind, key: k, value }) => {
      const store =
        kind === "session" ? window.sessionStorage : window.localStorage;
      store.setItem(k, value);
    },
    { kind: opts.kind, key, value: String(opts.value ?? "") },
  );
}

export async function storageClearViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  kind: StorageKind;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.evaluate(
    ({ kind }) => {
      const store =
        kind === "session" ? window.sessionStorage : window.localStorage;
      store.clear();
    },
    { kind: opts.kind },
  );
}

export async function setOfflineViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  offline: boolean;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.context().setOffline(Boolean(opts.offline));
}

export async function setExtraHTTPHeadersViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  headers: Record<string, string>;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.context().setExtraHTTPHeaders(opts.headers);
}

export async function setHttpCredentialsViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  username?: string;
  password?: string;
  clear?: boolean;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  if (opts.clear) {
    await page.context().setHTTPCredentials(null);
    return;
  }
  const username = String(opts.username ?? "");
  const password = String(opts.password ?? "");
  if (!username) throw new Error("username is required (or set clear=true)");
  await page.context().setHTTPCredentials({ username, password });
}

export async function setGeolocationViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  latitude?: number;
  longitude?: number;
  accuracy?: number;
  origin?: string;
  clear?: boolean;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const context = page.context();
  if (opts.clear) {
    await context.setGeolocation(null);
    await context.clearPermissions().catch(() => {});
    return;
  }
  if (typeof opts.latitude !== "number" || typeof opts.longitude !== "number") {
    throw new Error("latitude and longitude are required (or set clear=true)");
  }
  await context.setGeolocation({
    latitude: opts.latitude,
    longitude: opts.longitude,
    accuracy: typeof opts.accuracy === "number" ? opts.accuracy : undefined,
  });
  const origin =
    opts.origin?.trim() ||
    (() => {
      try {
        return new URL(page.url()).origin;
      } catch {
        return "";
      }
    })();
  if (origin) {
    await context.grantPermissions(["geolocation"], { origin }).catch(() => {});
  }
}

export async function emulateMediaViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  colorScheme: "dark" | "light" | "no-preference" | null;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.emulateMedia({ colorScheme: opts.colorScheme });
}

async function withCdpSession<T>(
  page: Page,
  fn: (session: CDPSession) => Promise<T>,
): Promise<T> {
  const session = await page.context().newCDPSession(page);
  try {
    return await fn(session);
  } finally {
    await session.detach().catch(() => {});
  }
}

export async function setLocaleViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  locale: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const locale = String(opts.locale ?? "").trim();
  if (!locale) throw new Error("locale is required");
  await withCdpSession(page, async (session) => {
    try {
      await session.send("Emulation.setLocaleOverride", { locale });
    } catch (err) {
      if (
        String(err).includes("Another locale override is already in effect")
      ) {
        return;
      }
      throw err;
    }
  });
}

export async function setTimezoneViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  timezoneId: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const timezoneId = String(opts.timezoneId ?? "").trim();
  if (!timezoneId) throw new Error("timezoneId is required");
  await withCdpSession(page, async (session) => {
    try {
      await session.send("Emulation.setTimezoneOverride", { timezoneId });
    } catch (err) {
      const msg = String(err);
      if (msg.includes("Timezone override is already in effect")) return;
      if (msg.includes("Invalid timezone"))
        throw new Error(`Invalid timezone ID: ${timezoneId}`);
      throw err;
    }
  });
}

export async function setDeviceViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  name: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const name = String(opts.name ?? "").trim();
  if (!name) throw new Error("device name is required");
  const descriptor = (playwrightDevices as Record<string, unknown>)[name] as
    | {
        userAgent?: string;
        viewport?: { width: number; height: number };
        deviceScaleFactor?: number;
        isMobile?: boolean;
        hasTouch?: boolean;
        locale?: string;
      }
    | undefined;
  if (!descriptor) {
    throw new Error(`Unknown device "${name}".`);
  }

  if (descriptor.viewport) {
    await page.setViewportSize({
      width: descriptor.viewport.width,
      height: descriptor.viewport.height,
    });
  }

  await withCdpSession(page, async (session) => {
    if (descriptor.userAgent || descriptor.locale) {
      await session.send("Emulation.setUserAgentOverride", {
        userAgent: descriptor.userAgent ?? "",
        acceptLanguage: descriptor.locale ?? undefined,
      });
    }
    if (descriptor.viewport) {
      await session.send("Emulation.setDeviceMetricsOverride", {
        mobile: Boolean(descriptor.isMobile),
        width: descriptor.viewport.width,
        height: descriptor.viewport.height,
        deviceScaleFactor: descriptor.deviceScaleFactor ?? 1,
        screenWidth: descriptor.viewport.width,
        screenHeight: descriptor.viewport.height,
      });
    }
    if (descriptor.hasTouch) {
      await session.send("Emulation.setTouchEmulationEnabled", {
        enabled: true,
      });
    }
  });
}

export async function typeViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
  text: string;
  submit?: boolean;
  slowly?: boolean;
  timeoutMs?: number;
}): Promise<void> {
  const text = String(opts.text ?? "");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const ref = requireRef(opts.ref);
  const locator = refLocator(page, ref);
  const timeout = Math.max(500, Math.min(60_000, opts.timeoutMs ?? 8000));
  try {
    if (opts.slowly) {
      await locator.click({ timeout });
      await locator.type(text, { timeout, delay: 75 });
    } else {
      await locator.fill(text, { timeout });
    }
    if (opts.submit) {
      await locator.press("Enter", { timeout });
    }
  } catch (err) {
    throw toAIFriendlyError(err, ref);
  }
}

export async function fillFormViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  fields: BrowserFormField[];
  timeoutMs?: number;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const timeout = Math.max(500, Math.min(60_000, opts.timeoutMs ?? 8000));
  for (const field of opts.fields) {
    const ref = field.ref.trim();
    const type = field.type.trim();
    const rawValue = field.value;
    const value =
      typeof rawValue === "string"
        ? rawValue
        : typeof rawValue === "number" || typeof rawValue === "boolean"
          ? String(rawValue)
          : "";
    if (!ref || !type) continue;
    const locator = refLocator(page, ref);
    if (type === "checkbox" || type === "radio") {
      const checked =
        rawValue === true ||
        rawValue === 1 ||
        rawValue === "1" ||
        rawValue === "true";
      try {
        await locator.setChecked(checked, { timeout });
      } catch (err) {
        throw toAIFriendlyError(err, ref);
      }
      continue;
    }
    try {
      await locator.fill(value, { timeout });
    } catch (err) {
      throw toAIFriendlyError(err, ref);
    }
  }
}

export async function evaluateViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  fn: string;
  ref?: string;
}): Promise<unknown> {
  const fnText = String(opts.fn ?? "").trim();
  if (!fnText) throw new Error("function is required");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  if (opts.ref) {
    const locator = refLocator(page, opts.ref);
    // Use Function constructor at runtime to avoid esbuild adding __name helper
    // which doesn't exist in the browser context
    // eslint-disable-next-line @typescript-eslint/no-implied-eval -- required for browser-context eval
    const elementEvaluator = new Function(
      "el",
      "fnBody",
      `
      "use strict";
      try {
        var candidate = eval("(" + fnBody + ")");
        return typeof candidate === "function" ? candidate(el) : candidate;
      } catch (err) {
        throw new Error("Invalid evaluate function: " + (err && err.message ? err.message : String(err)));
      }
      `,
    ) as (el: Element, fnBody: string) => unknown;
    return await locator.evaluate(elementEvaluator, fnText);
  }
  // Use Function constructor at runtime to avoid esbuild adding __name helper
  // which doesn't exist in the browser context
  // eslint-disable-next-line @typescript-eslint/no-implied-eval -- required for browser-context eval
  const browserEvaluator = new Function(
    "fnBody",
    `
    "use strict";
    try {
      var candidate = eval("(" + fnBody + ")");
      return typeof candidate === "function" ? candidate() : candidate;
    } catch (err) {
      throw new Error("Invalid evaluate function: " + (err && err.message ? err.message : String(err)));
    }
    `,
  ) as (fnBody: string) => unknown;
  return await page.evaluate(browserEvaluator, fnText);
}

export async function armFileUploadViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  paths?: string[];
  timeoutMs?: number;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const timeout = Math.max(500, Math.min(120_000, opts.timeoutMs ?? 120_000));

  state.armIdUpload = nextUploadArmId += 1;
  const armId = state.armIdUpload;

  void page
    .waitForEvent("filechooser", { timeout })
    .then(async (fileChooser) => {
      if (state.armIdUpload !== armId) return;
      if (!opts.paths?.length) {
        // Playwright removed `FileChooser.cancel()`; best-effort close the chooser instead.
        try {
          await page.keyboard.press("Escape");
        } catch {
          // Best-effort.
        }
        return;
      }
      await fileChooser.setFiles(opts.paths);
      try {
        const input =
          typeof fileChooser.element === "function"
            ? await Promise.resolve(fileChooser.element())
            : null;
        if (input) {
          await input.evaluate((el) => {
            el.dispatchEvent(new Event("input", { bubbles: true }));
            el.dispatchEvent(new Event("change", { bubbles: true }));
          });
        }
      } catch {
        // Best-effort for sites that don't react to setFiles alone.
      }
    })
    .catch(() => {
      // Ignore timeouts; the chooser may never appear.
    });
}

export async function setInputFilesViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  inputRef?: string;
  element?: string;
  paths: string[];
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  if (!opts.paths.length) throw new Error("paths are required");
  const inputRef =
    typeof opts.inputRef === "string" ? opts.inputRef.trim() : "";
  const element = typeof opts.element === "string" ? opts.element.trim() : "";
  if (inputRef && element) {
    throw new Error("inputRef and element are mutually exclusive");
  }
  if (!inputRef && !element) {
    throw new Error("inputRef or element is required");
  }

  const locator = inputRef
    ? refLocator(page, inputRef)
    : page.locator(element).first();

  try {
    await locator.setInputFiles(opts.paths);
  } catch (err) {
    throw toAIFriendlyError(err, inputRef || element);
  }
  try {
    const handle = await locator.elementHandle();
    if (handle) {
      await handle.evaluate((el) => {
        el.dispatchEvent(new Event("input", { bubbles: true }));
        el.dispatchEvent(new Event("change", { bubbles: true }));
      });
    }
  } catch {
    // Best-effort for sites that don't react to setInputFiles alone.
  }
}

export async function armDialogViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  accept: boolean;
  promptText?: string;
  timeoutMs?: number;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const timeout = normalizeTimeoutMs(opts.timeoutMs, 120_000);

  state.armIdDialog = nextDialogArmId += 1;
  const armId = state.armIdDialog;

  void page
    .waitForEvent("dialog", { timeout })
    .then(async (dialog) => {
      if (state.armIdDialog !== armId) return;
      if (opts.accept) await dialog.accept(opts.promptText);
      else await dialog.dismiss();
    })
    .catch(() => {
      // Ignore timeouts; the dialog may never appear.
    });
}

export async function waitForDownloadViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  path?: string;
  timeoutMs?: number;
}): Promise<{
  url: string;
  suggestedFilename: string;
  path: string;
}> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const timeout = normalizeTimeoutMs(opts.timeoutMs, 120_000);

  state.armIdDownload = nextDownloadArmId += 1;
  const armId = state.armIdDownload;

  const waiter = createPageDownloadWaiter(page, timeout);
  try {
    const download = (await waiter.promise) as {
      url?: () => string;
      suggestedFilename?: () => string;
      saveAs?: (outPath: string) => Promise<void>;
    };
    if (state.armIdDownload !== armId) {
      throw new Error("Download was superseded by another waiter");
    }
    const suggested = download.suggestedFilename?.() || "download.bin";
    const outPath = opts.path?.trim() || buildTempDownloadPath(suggested);
    await fs.mkdir(path.dirname(outPath), { recursive: true });
    await download.saveAs?.(outPath);
    return {
      url: download.url?.() || "",
      suggestedFilename: suggested,
      path: path.resolve(outPath),
    };
  } catch (err) {
    waiter.cancel();
    throw err;
  }
}

export async function downloadViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref: string;
  path: string;
  timeoutMs?: number;
}): Promise<{
  url: string;
  suggestedFilename: string;
  path: string;
}> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  const timeout = normalizeTimeoutMs(opts.timeoutMs, 120_000);

  const ref = requireRef(opts.ref);
  const outPath = String(opts.path ?? "").trim();
  if (!outPath) throw new Error("path is required");

  state.armIdDownload = nextDownloadArmId += 1;
  const armId = state.armIdDownload;

  const waiter = createPageDownloadWaiter(page, timeout);
  try {
    const locator = refLocator(page, ref);
    try {
      await locator.click({ timeout });
    } catch (err) {
      throw toAIFriendlyError(err, ref);
    }

    const download = (await waiter.promise) as {
      url?: () => string;
      suggestedFilename?: () => string;
      saveAs?: (outPath: string) => Promise<void>;
    };
    if (state.armIdDownload !== armId) {
      throw new Error("Download was superseded by another waiter");
    }
    const suggested = download.suggestedFilename?.() || "download.bin";
    await fs.mkdir(path.dirname(outPath), { recursive: true });
    await download.saveAs?.(outPath);
    return {
      url: download.url?.() || "",
      suggestedFilename: suggested,
      path: path.resolve(outPath),
    };
  } catch (err) {
    waiter.cancel();
    throw err;
  }
}

export async function responseBodyViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  url: string;
  timeoutMs?: number;
  maxChars?: number;
}): Promise<{
  url: string;
  status?: number;
  headers?: Record<string, string>;
  body: string;
  truncated?: boolean;
}> {
  const pattern = String(opts.url ?? "").trim();
  if (!pattern) throw new Error("url is required");
  const maxChars =
    typeof opts.maxChars === "number" && Number.isFinite(opts.maxChars)
      ? Math.max(1, Math.min(5_000_000, Math.floor(opts.maxChars)))
      : 200_000;
  const timeout = normalizeTimeoutMs(opts.timeoutMs, 20_000);

  const page = await getPageForTargetId(opts);
  ensurePageState(page);

  const promise = new Promise<unknown>((resolve, reject) => {
    let done = false;
    let timer: NodeJS.Timeout | undefined;
    let handler: ((resp: unknown) => void) | undefined;

    const cleanup = () => {
      if (timer) clearTimeout(timer);
      timer = undefined;
      if (handler) page.off("response", handler as never);
    };

    handler = (resp: unknown) => {
      if (done) return;
      const r = resp as { url?: () => string };
      const u = r.url?.() || "";
      if (!matchUrlPattern(pattern, u)) return;
      done = true;
      cleanup();
      resolve(resp);
    };

    page.on("response", handler as never);
    timer = setTimeout(() => {
      if (done) return;
      done = true;
      cleanup();
      reject(
        new Error(
          `Response not found for url pattern "${pattern}". Run 'clawdbot browser requests' to inspect recent network activity.`,
        ),
      );
    }, timeout);
  });

  const resp = (await promise) as {
    url?: () => string;
    status?: () => number;
    headers?: () => Record<string, string>;
    body?: () => Promise<Buffer>;
    text?: () => Promise<string>;
  };

  const url = resp.url?.() || "";
  const status = resp.status?.();
  const headers = resp.headers?.();

  let bodyText = "";
  try {
    if (typeof resp.text === "function") {
      bodyText = await resp.text();
    } else if (typeof resp.body === "function") {
      const buf = await resp.body();
      bodyText = new TextDecoder("utf-8").decode(buf);
    }
  } catch (err) {
    throw new Error(
      `Failed to read response body for "${url}": ${String(err)}`,
    );
  }

  const trimmed =
    bodyText.length > maxChars ? bodyText.slice(0, maxChars) : bodyText;
  return {
    url,
    status,
    headers,
    body: trimmed,
    truncated: bodyText.length > maxChars ? true : undefined,
  };
}

export async function navigateViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  url: string;
  timeoutMs?: number;
}): Promise<{ url: string }> {
  const url = String(opts.url ?? "").trim();
  if (!url) throw new Error("url is required");
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.goto(url, {
    timeout: Math.max(1000, Math.min(120_000, opts.timeoutMs ?? 20_000)),
  });
  return { url: page.url() };
}

export async function waitForViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  timeMs?: number;
  text?: string;
  textGone?: string;
  selector?: string;
  url?: string;
  loadState?: "load" | "domcontentloaded" | "networkidle";
  fn?: string;
  timeoutMs?: number;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const timeout = normalizeTimeoutMs(opts.timeoutMs, 20_000);

  if (typeof opts.timeMs === "number" && Number.isFinite(opts.timeMs)) {
    await page.waitForTimeout(Math.max(0, opts.timeMs));
  }
  if (opts.text) {
    await page.getByText(opts.text).first().waitFor({
      state: "visible",
      timeout,
    });
  }
  if (opts.textGone) {
    await page.getByText(opts.textGone).first().waitFor({
      state: "hidden",
      timeout,
    });
  }
  if (opts.selector) {
    const selector = String(opts.selector).trim();
    if (selector) {
      await page
        .locator(selector)
        .first()
        .waitFor({ state: "visible", timeout });
    }
  }
  if (opts.url) {
    const url = String(opts.url).trim();
    if (url) {
      await page.waitForURL(url, { timeout });
    }
  }
  if (opts.loadState) {
    await page.waitForLoadState(opts.loadState, { timeout });
  }
  if (opts.fn) {
    const fn = String(opts.fn).trim();
    if (fn) {
      await page.waitForFunction(fn, { timeout });
    }
  }
}

export async function takeScreenshotViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  ref?: string;
  element?: string;
  fullPage?: boolean;
  type?: "png" | "jpeg";
}): Promise<{ buffer: Buffer }> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const type = opts.type ?? "png";
  if (opts.ref) {
    if (opts.fullPage)
      throw new Error("fullPage is not supported for element screenshots");
    const locator = refLocator(page, opts.ref);
    const buffer = await locator.screenshot({ type });
    return { buffer };
  }
  if (opts.element) {
    if (opts.fullPage)
      throw new Error("fullPage is not supported for element screenshots");
    const locator = page.locator(opts.element).first();
    const buffer = await locator.screenshot({ type });
    return { buffer };
  }
  const buffer = await page.screenshot({
    type,
    fullPage: Boolean(opts.fullPage),
  });
  return { buffer };
}

export async function resizeViewportViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  width: number;
  height: number;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.setViewportSize({
    width: Math.max(1, Math.floor(opts.width)),
    height: Math.max(1, Math.floor(opts.height)),
  });
}

export async function closePageViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
}): Promise<void> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  await page.close();
}

export async function pdfViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
}): Promise<{ buffer: Buffer }> {
  const page = await getPageForTargetId(opts);
  ensurePageState(page);
  const buffer = await page.pdf({ printBackground: true });
  return { buffer };
}

function consolePriority(level: string) {
  switch (level) {
    case "error":
      return 3;
    case "warning":
      return 2;
    case "info":
    case "log":
      return 1;
    case "debug":
      return 0;
    default:
      return 1;
  }
}

export async function getConsoleMessagesViaPlaywright(opts: {
  cdpUrl: string;
  targetId?: string;
  level?: string;
}): Promise<BrowserConsoleMessage[]> {
  const page = await getPageForTargetId(opts);
  const state = ensurePageState(page);
  if (!opts.level) return [...state.console];
  const min = consolePriority(opts.level);
  return state.console.filter((msg) => consolePriority(msg.type) >= min);
}