import { Trans, useLingui } from "@lingui/react/macro";
import type { Bot, ComputerStatus } from "@rakazo/contracts";
import { Button, cn, Input } from "@rakazo/ui-web";
import { ArrowLeft, ArrowRight, ExternalLink, Loader2, RotateCw } from "lucide-react";
import { type FormEvent, useCallback, useEffect, useRef, useState } from "react";
import { normalizeBrowserUrl } from "../../lib/browser-url";
import { rpc } from "../../lib/rpc";
import { screenIframeSandbox } from "../../pages/shell/computer-screen";
import { ComputersUnavailableHint, computersAreUnavailable } from "../ComputersUnavailableHint";
import { AgentCursor } from "../computer/AgentCursor";
import { BrowserCoworkOverlay } from "./BrowserCoworkOverlay";

type ChromeState = {
  url: string;
  title: string;
  loading: boolean;
  canGoBack: boolean;
  canGoForward: boolean;
};

const EMPTY_CHROME: ChromeState = {
  url: "",
  title: "",
  loading: false,
  canGoBack: false,
  canGoForward: false,
};

export function OoComputerBrowser({
  active,
  computer,
  embeddedScreenUrl,
  computerScreenError,
  sandboxProvider,
  booting,
  onBoot,
  onRefreshScreen,
}: {
  active: Bot;
  computer: ComputerStatus | null;
  embeddedScreenUrl: string | null;
  computerScreenError: React.ReactNode;
  sandboxProvider: string | undefined;
  booting: boolean;
  onBoot: () => Promise<void>;
  onRefreshScreen: () => Promise<unknown>;
}) {
  const { t } = useLingui();
  const [chrome, setChrome] = useState<ChromeState>(EMPTY_CHROME);
  const [draft, setDraft] = useState("");
  const [invalid, setInvalid] = useState(false);
  const [busy, setBusy] = useState(false);
  const editing = useRef(false);
  const inputRef = useRef<HTMLInputElement>(null);
  const engagedScreen = useRef(false);

  const refreshChrome = useCallback(async () => {
    if (computer?.state !== "running") return;
    try {
      const next = await rpc.computer.browserChromeState({ botId: active.id });
      setChrome(next);
      if (!editing.current) setDraft(next.url);
    } catch {
      /* Address bar may lag the live tab while the computer boots. */
    }
  }, [active.id, computer?.state]);

  useEffect(() => {
    if (computer?.state !== "running") return;
    void refreshChrome();
    const timer = window.setInterval(() => void refreshChrome(), 4000);
    return () => window.clearInterval(timer);
  }, [computer?.state, refreshChrome]);

  useEffect(() => {
    if (computer?.state === "running" && (embeddedScreenUrl || computer?.kind === "desktop"))
      return;
    void onBoot().catch(() => undefined);
  }, [active.id, computer?.kind, computer?.state, embeddedScreenUrl, onBoot]);

  const runNav = useCallback(
    async (task: () => Promise<ChromeState>) => {
      setBusy(true);
      try {
        const next = await task();
        setChrome(next);
        if (!editing.current) setDraft(next.url);
        await onRefreshScreen();
      } finally {
        setBusy(false);
      }
    },
    [onRefreshScreen],
  );

  const onSubmit = (event: FormEvent) => {
    event.preventDefault();
    const url = normalizeBrowserUrl(draft);
    setInvalid(!url);
    if (!url) return;
    editing.current = false;
    void runNav(async () => {
      const next = await rpc.computer.browserNavigate({ botId: active.id, url });
      await rpc.computer
        .browserUserAction({
          botId: active.id,
          kind: "navigate",
          detail: url,
        })
        .catch(() => undefined);
      return next;
    });
    inputRef.current?.blur();
  };

  const reportUserAction = useCallback(
    (detail: { kind: "click" | "scroll" | "type"; detail: string }) => {
      void rpc.computer
        .browserUserAction({
          botId: active.id,
          kind: detail.kind,
          detail: detail.detail,
          passwordField: detail.kind === "type" && detail.detail.length > 1 ? false : undefined,
        })
        .catch(() => undefined);
    },
    [active.id],
  );

  const showScreen = computer?.state === "running" && embeddedScreenUrl && !computerScreenError;
  const unavailable = computersAreUnavailable(sandboxProvider);

  return (
    <>
      <form onSubmit={onSubmit} className="relative flex items-center gap-0.5 border-b px-2 py-1.5">
        <Button
          type="button"
          variant="ghost"
          size="icon-sm"
          aria-label={t`Back`}
          disabled={!chrome.canGoBack || busy}
          onClick={() => void runNav(() => rpc.computer.browserBack({ botId: active.id }))}
        >
          <ArrowLeft strokeWidth={1.7} className="size-icon-md" />
        </Button>
        <Button
          type="button"
          variant="ghost"
          size="icon-sm"
          aria-label={t`Forward`}
          disabled={!chrome.canGoForward || busy}
          onClick={() => void runNav(() => rpc.computer.browserForward({ botId: active.id }))}
        >
          <ArrowRight strokeWidth={1.7} className="size-icon-md" />
        </Button>
        <Button
          type="button"
          variant="ghost"
          size="icon-sm"
          aria-label={t`Reload`}
          disabled={busy || computer?.state !== "running"}
          onClick={() => void runNav(() => rpc.computer.browserReload({ botId: active.id }))}
        >
          {busy || chrome.loading ? (
            <Loader2 strokeWidth={1.7} className="size-icon-md animate-spin" />
          ) : (
            <RotateCw strokeWidth={1.7} className="size-icon-md" />
          )}
        </Button>
        <Input
          ref={inputRef}
          value={draft}
          aria-label={t`Address`}
          aria-invalid={invalid || undefined}
          inputMode="url"
          autoComplete="off"
          autoCapitalize="off"
          spellCheck={false}
          placeholder="https://"
          onFocus={(event) => {
            editing.current = true;
            event.currentTarget.select();
          }}
          onBlur={() => {
            editing.current = false;
          }}
          onChange={(event) => {
            setDraft(event.target.value);
            setInvalid(false);
          }}
          className="mx-1 h-control-sm min-w-0 flex-1 rounded-full bg-muted/60 px-3 text-ui-body-sm"
        />
        <Button
          type="button"
          variant="ghost"
          size="icon-sm"
          aria-label={t`Open in browser`}
          disabled={!chrome.url}
          onClick={() => window.open(chrome.url, "_blank", "noopener,noreferrer")}
        >
          <ExternalLink strokeWidth={1.7} className="size-icon-md" />
        </Button>
        <div
          aria-hidden
          className={cn(
            "absolute inset-x-0 -bottom-px h-0.5 overflow-hidden transition-opacity duration-300",
            chrome.loading || booting ? "opacity-100" : "opacity-0",
          )}
        >
          <div className="rk-browser-progress h-full w-1/3 rounded-full bg-primary/70" />
        </div>
      </form>
      <div
        className="relative min-h-0 flex-1 bg-background"
        data-testid="oo-computer-browser-viewport"
      >
        {unavailable ? (
          <div className="grid h-full place-items-center px-6 text-center text-ui-body-sm text-muted-foreground">
            <ComputersUnavailableHint />
          </div>
        ) : showScreen ? (
          <>
            <iframe
              title={t`${active.name} browser`}
              src={embeddedScreenUrl}
              sandbox={screenIframeSandbox(embeddedScreenUrl)}
              className="h-full w-full border-0 bg-black"
              allow="clipboard-read; clipboard-write; fullscreen"
              data-testid="oo-computer-browser-screen"
            />
            <AgentCursor botId={active.id} color={active.color} name={active.name} />
            <BrowserCoworkOverlay
              botId={active.id}
              computer={computer}
              enabled
              onEngaged={() => {
                engagedScreen.current = true;
                void onRefreshScreen();
              }}
              onUserAction={reportUserAction}
            />
          </>
        ) : (
          <div className="grid h-full place-items-center px-6 text-center text-ui-body-sm text-muted-foreground">
            {computerScreenError ??
              (booting || computer?.state === "booting" ? (
                <span className="inline-flex items-center gap-2">
                  <Loader2 className="size-icon-md animate-spin" aria-hidden />
                  <Trans>Starting computer</Trans>
                </span>
              ) : (
                <Trans>{active.name}'s browser appears here when the computer is running.</Trans>
              ))}
          </div>
        )}
      </div>
    </>
  );
}