siftlode/frontend/src/components/OnboardingWizard.tsx

import { useEffect, useRef } from "react";
import { Trans, useTranslation } from "react-i18next";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { qk } from "../lib/queryKeys";
import { AlertTriangle, Check, Loader2, RefreshCw, ShieldCheck, X, Youtube } from "lucide-react";
import { api, type Me } from "../lib/api";
import { beginGrant, endOnboarding } from "../lib/onboarding";
import { notifyActionError } from "../lib/actionErrors";
import Overlay from "./Overlay";

// A first-login wizard that walks the user through granting YouTube access one scope at a
// time, each with a plain explanation and an up-front heads-up about Google's "unverified
// app" screen. Sign-in itself only asks for name/email (no warning); YouTube access is
// always an explicit, informed opt-in here.
//
// The visible step is derived from what's already granted, so the wizard resumes correctly
// after each redirect: no read -> "read", read but no write -> "write", both -> "done".
// Right after read is granted, it auto-imports the user's subscriptions so they land on a
// populated feed (channels already in the shared catalog appear instantly).

// A small reusable heads-up so the Google consent warning never feels like a surprise.
function ConsentHeadsUp() {
  return (
    <div className="flex gap-2.5 rounded-xl border border-warn/30 bg-warn/5 p-3 text-left">
      <AlertTriangle className="w-4 h-4 shrink-0 mt-0.5 text-warn" />
      <p className="text-xs leading-relaxed text-fg/80">
        <Trans
          i18nKey="onboarding.consent"
          components={[
            <span className="font-medium" />,
            <span className="font-medium" />,
            <span className="font-medium" />,
            <a
              href="https://myaccount.google.com/permissions"
              target="_blank"
              rel="noreferrer"
              className="text-accent hover:underline"
            />,
          ]}
        />
      </p>
    </div>
  );
}

function Dots({ index, total }: { index: number; total: number }) {
  return (
    <div className="flex justify-center gap-1.5">
      {Array.from({ length: total }).map((_, i) => (
        <span
          key={i}
          className={`h-1.5 rounded-full transition-all ${
            i === index ? "w-5 bg-accent" : "w-1.5 bg-border"
          }`}
        />
      ))}
    </div>
  );
}

export default function OnboardingWizard({ me, onClose }: { me: Me; onClose: () => void }) {
  const { t } = useTranslation();
  const qc = useQueryClient();
  const importTriggered = useRef(false);

  // Once we have read access, find out whether any subscriptions are imported yet.
  const myStatus = useQuery({
    queryKey: qk.myStatus(),
    queryFn: api.myStatus,
    enabled: me.can_read,
  });

  const importSubs = useMutation({
    mutationFn: () => api.syncSubscriptions(),
    onSuccess: () => {
      // Feed/channels/status now have content — refresh the app behind the wizard.
      qc.invalidateQueries({ queryKey: qk.feed() });
      qc.invalidateQueries({ queryKey: qk.feedSummary() });
      qc.invalidateQueries({ queryKey: qk.channels() });
      qc.invalidateQueries({ queryKey: qk.myStatus() });
    },
    // Say something rather than nothing: this route is rate-limited (SEC-14) and can 403 without a
    // read grant, and a swallowed rejection here leaves the wizard looking like it simply did not
    // run. The server's own reason wins over the fallback.
    onError: (e) => notifyActionError(e, t("onboarding.importFailed")),
  });

  // First time we see read access with zero imported channels, pull the user's
  // subscriptions automatically so they don't have to hunt for a button.
  useEffect(() => {
    if (
      me.can_read &&
      myStatus.data &&
      myStatus.data.channels_total === 0 &&
      !importTriggered.current
    ) {
      importTriggered.current = true;
      importSubs.mutate();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [me.can_read, myStatus.data?.channels_total]);

  // Closing without finishing the essential read step suppresses future auto-popups
  // (it stays reachable from Settings). Once read is granted, closing is just "done".
  const close = () => {
    endOnboarding(!me.can_read);
    onClose();
  };

  useEffect(() => {
    function onKey(e: KeyboardEvent) {
      if (e.key === "Escape") close();
    }
    document.addEventListener("keydown", onKey);
    return () => document.removeEventListener("keydown", onKey);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [me.can_read]);

  // Are we currently importing (or about to)? Show a progress screen instead of the
  // "you're connected" step until the first import settles.
  const importing =
    me.can_read &&
    !importSubs.isError &&
    (importSubs.isPending ||
      (importTriggered.current && !importSubs.isSuccess) ||
      (myStatus.data?.channels_total === 0 && !importSubs.isSuccess));

  const step = !me.can_read ? "read" : !me.can_write ? "write" : "done";
  const stepIndex = step === "read" ? 0 : step === "write" ? 1 : 2;

  return (
    <Overlay>
      <div className="fixed inset-0 z-overlay grid place-items-center p-4">
        <div
          className="absolute inset-0 bg-black/50 animate-[overlayIn_0.2s_ease]"
          onClick={close}
        />
        <div className="glass relative w-[min(94vw,460px)] rounded-2xl p-7 text-center animate-[panelIn_0.26s_cubic-bezier(0.22,1,0.36,1)]">
          <button
            onClick={close}
            className="absolute top-3 right-3 p-2 rounded-lg text-muted hover:text-fg hover:bg-card/60 transition"
            aria-label={t("onboarding.close")}
          >
            <X className="w-4 h-4" />
          </button>

          {step === "read" && (
            <>
              <div className="mx-auto mb-4 grid place-items-center w-12 h-12 rounded-2xl bg-accent/15 text-accent">
                <Youtube className="w-6 h-6" />
              </div>
              <h2 className="text-lg font-semibold">{t("onboarding.read.title")}</h2>
              <p className="text-sm text-muted leading-relaxed mt-2 mb-4">
                <Trans
                  i18nKey="onboarding.read.body"
                  components={[<span className="text-fg/90" />]}
                />
              </p>
              <ConsentHeadsUp />
              <div className="mt-5 flex flex-col gap-2">
                <button
                  onClick={() => beginGrant("read")}
                  className="inline-flex items-center justify-center gap-2 px-5 py-3 rounded-xl font-semibold btn-primary transition"
                >
                  <Youtube className="w-4 h-4" /> {t("onboarding.read.connect")}
                </button>
                <button
                  onClick={close}
                  className="px-5 py-2 rounded-xl text-sm text-muted hover:text-fg transition"
                >
                  {t("onboarding.read.skip")}
                </button>
              </div>
            </>
          )}

          {/* Read granted: show import progress before the optional write step. */}
          {me.can_read && importing && (
            <>
              <div className="mx-auto mb-4 grid place-items-center w-12 h-12 rounded-2xl bg-accent/15 text-accent">
                <Loader2 className="w-6 h-6 animate-spin" />
              </div>
              <h2 className="text-lg font-semibold">{t("onboarding.importing.title")}</h2>
              <p className="text-sm text-muted leading-relaxed mt-2 mb-2">
                {t("onboarding.importing.body")}
              </p>
            </>
          )}

          {step === "write" && !importing && (
            <>
              <div className="mx-auto mb-4 grid place-items-center w-12 h-12 rounded-2xl bg-accent/15 text-accent">
                <Check className="w-6 h-6" />
              </div>
              <h2 className="text-lg font-semibold">{t("onboarding.write.title")}</h2>
              <p className="text-sm text-muted leading-relaxed mt-2 mb-4">
                {importSubs.isError ? (
                  <>{t("onboarding.write.importFailed")}</>
                ) : (
                  <>
                    {t("onboarding.write.feedReady", {
                      channels: myStatus.data
                        ? t("onboarding.write.feedReadyChannels", {
                            count: myStatus.data.channels_total,
                          })
                        : "",
                    })}
                  </>
                )}
                {!importSubs.isError && (
                  <Trans
                    i18nKey="onboarding.write.rationale"
                    components={[<span className="text-fg/90" />]}
                  />
                )}
              </p>
              {importSubs.isError && (
                <button
                  onClick={() => importSubs.mutate()}
                  className="mb-3 inline-flex items-center justify-center gap-2 px-4 py-2 rounded-xl text-sm bg-card border border-border hover:border-accent transition"
                >
                  <RefreshCw className="w-4 h-4" /> {t("onboarding.write.retryImport")}
                </button>
              )}
              <ConsentHeadsUp />
              <div className="mt-5 flex flex-col gap-2">
                <button
                  onClick={() => beginGrant("write")}
                  className="inline-flex items-center justify-center gap-2 px-5 py-3 rounded-xl font-semibold btn-primary transition"
                >
                  <ShieldCheck className="w-4 h-4" /> {t("onboarding.write.enableUnsubscribe")}
                </button>
                <button
                  onClick={() => {
                    endOnboarding(false);
                    onClose();
                  }}
                  className="px-5 py-2 rounded-xl text-sm text-muted hover:text-fg transition"
                >
                  {t("onboarding.write.keepReadOnly")}
                </button>
              </div>
            </>
          )}

          {step === "done" && !importing && (
            <>
              <div className="mx-auto mb-4 grid place-items-center w-12 h-12 rounded-2xl bg-accent/15 text-accent">
                <Check className="w-6 h-6" />
              </div>
              <h2 className="text-lg font-semibold">{t("onboarding.done.title")}</h2>
              <p className="text-sm text-muted leading-relaxed mt-2 mb-5">
                {t("onboarding.done.body")}
              </p>
              <button
                onClick={() => {
                  endOnboarding(false);
                  onClose();
                }}
                className="inline-flex items-center justify-center gap-2 px-5 py-3 rounded-xl font-semibold btn-primary transition w-full"
              >
                {t("onboarding.done.done")}
              </button>
            </>
          )}

          <div className="mt-6">
            <Dots index={stepIndex} total={3} />
          </div>
        </div>
      </div>
    </Overlay>
  );
}