/**
 * @file OnboardingWizard.tsx
 * @description The first-run setup, once per ACCOUNT (docs/plans/onboarding;
 * modelled on Orca's welcome): 1 the default agent — the AI tools detected on
 * this machine, the rest behind "show more" — and the permission mode a new
 * session starts in (never bypass: that stays per session); 2 the look —
 * System / Dark / Light, a theme for each mode, language and terminal font;
 * 3 the corner pet (`PetSettings`); 4 notifications — permission, sound,
 * a test. Every choice is the same localStorage write Settings makes, so it
 * applies at once and is synced to the account (`lib/userPrefs.ts`). Shown
 * when the account has not been through it and has no workspace yet (one that
 * has is marked done silently), or when Settings asks for it again. The last
 * step hands over to the tour (`OnboardingTour`).
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useRef, useState, type ReactNode } from "react";
import { useTranslation } from "react-i18next";
import { useNavigate } from "react-router-dom";
import { Check, ChevronLeft, Monitor, Moon, Play, Sun, Zap } from "lucide-react";
import { api } from "../../lib/api";
import { useDialog } from "../../hooks/useDialog";
import { useAiTools } from "../../hooks/useAiTools";
import { THEMES, useTheme, type Theme, type ThemeMode } from "../../hooks/useTheme";
import { AiToolIcon } from "../AiToolIcon";
import { Switch } from "../Switch";
import { SettingsSegmented } from "../settings/SettingsRow";
import { PetSettings } from "../settings/PetSettings";
import { Swatch, THEME_LABELS } from "../settings/AppearanceSettings";
import { markOnboarded, useOnboarding } from "../../lib/userPrefs";
import {
  DEFAULT_MODES,
  readDefaultMode,
  readDefaultTool,
  writeDefaultMode,
  writeDefaultTool,
  type DefaultMode,
} from "../../lib/sessionDefaults";
import {
  TERMINAL_FONTS,
  readTerminalFont,
  writeTerminalFont,
  type TerminalFont,
} from "../../lib/terminalFont";
import {
  NOTIF_SOUNDS,
  loadNotifPrefs,
  saveNotifPrefs,
  type NotifPrefs,
  type NotifSound,
} from "../../lib/notifPrefs";
import { notify, playSound } from "../../lib/notify";
import { subscribeToPush } from "../../lib/push";
import { startTour } from "./OnboardingTour";

const STEPS = ["agent", "look", "pet", "notify"] as const;
type Step = (typeof STEPS)[number];

/** Mounted once in the layout: decides whether this account sees the setup. */
export function OnboardingWizard() {
  const { loaded, onboardedAt, forced } = useOnboarding();
  const [show, setShow] = useState(false);
  useEffect(() => {
    if (!loaded || onboardedAt) return setShow(false);
    if (forced) return setShow(true);
    let alive = true;
    api.lanes
      .list()
      .then((r) => {
        if (!alive) return;
        // An account already at work never needed a welcome.
        if (r.lanes.length) void markOnboarded();
        else setShow(true);
      })
      .catch(() => {
        /* cannot tell: ask again next load rather than interrupt */
      });
    return () => {
      alive = false;
    };
  }, [loaded, onboardedAt, forced]);
  return show ? <Wizard /> : null;
}

function Wizard() {
  const { t } = useTranslation("onboarding");
  const navigate = useNavigate();
  const [index, setIndex] = useState(0);
  const step: Step = STEPS[index] ?? "agent";
  const last = index === STEPS.length - 1;
  const panelRef = useRef<HTMLDivElement>(null);
  useDialog(true, panelRef);

  const skip = () => void markOnboarded();
  const next = () => {
    if (!last) return setIndex(index + 1);
    void markOnboarded();
    startTour();
    navigate("/");
  };

  // Ctrl/⌘+Enter continues, like Orca.
  const nextRef = useRef(next);
  nextRef.current = next;
  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) {
        e.preventDefault();
        nextRef.current();
      }
    };
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, []);

  return (
    <div className="fixed inset-0 z-[65] flex items-center justify-center bg-black/70 p-4 backdrop-blur-sm">
      <div
        ref={panelRef}
        role="dialog"
        aria-modal="true"
        aria-labelledby="onboarding-title"
        data-testid="onboarding-wizard"
        className="flex h-[min(820px,92vh)] w-full max-w-4xl flex-col rounded-2xl border border-border bg-surface-1 shadow-2xl shadow-black/50"
      >
        <div className="space-y-5 px-8 pt-7">
          <div className="flex items-center gap-2.5">
            <img src="/favicon.svg" alt="" className="h-7 w-7" />
            <span className="text-sm font-semibold text-fg-primary">{t("brand")}</span>
          </div>
          <div className="flex items-center gap-3" aria-hidden>
            {STEPS.map((s, i) => (
              <span
                key={s}
                className={`h-1 w-9 rounded-full ${i <= index ? "bg-fg-primary" : "bg-surface-4"}`}
              />
            ))}
            <span className="text-xs text-fg-muted">
              {t("progress", { n: index + 1, total: STEPS.length })}
            </span>
          </div>
        </div>

        <div className="min-h-0 flex-1 overflow-y-auto px-8 py-6">
          {step === "agent" && <AgentStep />}
          {step === "look" && <LookStep />}
          {step === "pet" && (
            <StepHead title={t("pet.title")} body={t("pet.body")}>
              <PetSettings />
            </StepHead>
          )}
          {step === "notify" && <NotifyStep />}
        </div>

        <div className="flex items-center gap-2 border-t border-border px-8 py-4">
          <button type="button" onClick={skip} className="btn-ghost text-xs">
            {t("skip")}
          </button>
          <span className="flex-1" />
          {index > 0 && (
            <button
              type="button"
              onClick={() => setIndex(index - 1)}
              className="btn-ghost border border-border text-xs"
            >
              <ChevronLeft className="h-3.5 w-3.5" />
              {t("back")}
            </button>
          )}
          <button
            type="button"
            onClick={next}
            data-testid="onboarding-next"
            className="btn-primary text-xs"
          >
            {last ? t("finish") : t("continue")}
            <kbd className="ml-1 rounded border border-white/30 px-1 text-[10px] font-normal opacity-80">
              Ctrl ↵
            </kbd>
          </button>
        </div>
      </div>
    </div>
  );
}

function StepHead({
  eyebrow,
  title,
  body,
  children,
}: {
  eyebrow?: string;
  title: string;
  body: string;
  children: ReactNode;
}) {
  return (
    <section className="space-y-6">
      <div className="space-y-2">
        {eyebrow && (
          <p className="text-[11px] font-semibold uppercase tracking-[0.18em] text-fg-muted">
            {eyebrow}
          </p>
        )}
        <h2 id="onboarding-title" className="text-3xl font-bold text-fg-primary">
          {title}
        </h2>
        <p className="text-sm text-fg-secondary">{body}</p>
      </div>
      {children}
    </section>
  );
}

function AgentStep() {
  const { t } = useTranslation("onboarding");
  const aiTools = useAiTools();
  const installed = aiTools.tools.filter((x) => x.installed && x.enabled);
  const others = aiTools.tools.filter((x) => !(x.installed && x.enabled));
  const [more, setMore] = useState(false);
  const [picked, setPicked] = useState<string | null>(readDefaultTool);
  const current =
    (picked && installed.some((x) => x.id === picked) ? picked : null) ??
    aiTools.defaultId ??
    installed[0]?.id ??
    null;
  const [mode, setMode] = useState<DefaultMode>(() => readDefaultMode() as DefaultMode);

  const pick = (id: string) => {
    writeDefaultTool(id);
    setPicked(id);
  };

  return (
    <StepHead eyebrow={t("agent.eyebrow")} title={t("agent.title")} body={t("agent.body")}>
      <div className="space-y-3">
        <p className="flex items-center gap-2 text-[11px] font-semibold uppercase tracking-[0.14em] text-fg-muted">
          <span className="h-1.5 w-1.5 rounded-full bg-status-success" />
          {t("agent.detected", { count: installed.length })}
        </p>
        {aiTools.loaded && !installed.length && (
          <p className="text-sm text-fg-muted">{t("agent.none")}</p>
        )}
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3">
          {installed.map((tool) => {
            const selected = tool.id === current;
            return (
              <button
                key={tool.id}
                type="button"
                onClick={() => pick(tool.id)}
                aria-pressed={selected}
                data-testid={`onboarding-agent-${tool.id}`}
                className={`relative flex items-center gap-3 rounded-xl border px-4 py-3.5 text-left transition-colors ${
                  selected
                    ? "border-accent bg-accent/10 ring-1 ring-accent/50"
                    : "border-border bg-surface-2 hover:border-border-light"
                }`}
              >
                <AiToolIcon tool={tool} className="h-6 w-6 shrink-0" />
                <span className="min-w-0">
                  <span className="block truncate text-sm font-medium text-fg-primary">
                    {tool.label}
                  </span>
                  <span className="block truncate font-mono text-xs text-fg-muted">
                    {tool.command || tool.id}
                  </span>
                </span>
                {selected && (
                  <span className="absolute right-2.5 top-2.5 flex h-5 w-5 items-center justify-center rounded-full bg-accent-solid text-white">
                    <Check className="h-3 w-3" />
                  </span>
                )}
              </button>
            );
          })}
          {more &&
            others.map((tool) => (
              <div
                key={tool.id}
                className="flex items-center gap-3 rounded-xl border border-dashed border-border px-4 py-3.5 opacity-60"
              >
                <AiToolIcon tool={tool} className="h-6 w-6 shrink-0" />
                <span className="min-w-0">
                  <span className="block truncate text-sm text-fg-primary">{tool.label}</span>
                  <span className="block text-xs text-fg-muted">{t("agent.notInstalled")}</span>
                </span>
              </div>
            ))}
        </div>
        {others.length > 0 && (
          <button
            type="button"
            onClick={() => setMore(!more)}
            className="text-xs font-medium text-fg-secondary hover:text-fg-primary"
          >
            {more ? t("agent.less") : `${t("agent.more", { count: others.length })} →`}
          </button>
        )}
      </div>

      <div className="space-y-2 rounded-xl border border-border bg-surface-2 px-4 py-3.5">
        <div className="flex flex-wrap items-center gap-3">
          <span className="text-sm font-medium text-fg-primary">{t("agent.permission")}</span>
          <SettingsSegmented
            ariaLabel={t("agent.permission")}
            value={mode}
            onChange={(m) => {
              writeDefaultMode(m);
              setMode(m);
            }}
            options={DEFAULT_MODES.map((m) => ({ value: m, label: t(`agent.modes.${m}`) }))}
          />
        </div>
        <p className="text-xs text-fg-muted">{t("agent.permissionHint")}</p>
      </div>
    </StepHead>
  );
}

const MODE_CARDS: { mode: ThemeMode; Icon: typeof Moon }[] = [
  { mode: "system", Icon: Monitor },
  { mode: "dark", Icon: Moon },
  { mode: "light", Icon: Sun },
];

function LookStep() {
  const { t, i18n } = useTranslation("onboarding");
  const { t: ts } = useTranslation("settings");
  const { mode, themeFor, setMode, setThemeFor } = useTheme();
  const [font, setFont] = useState<TerminalFont>(readTerminalFont);

  return (
    <StepHead title={t("look.title")} body={t("look.body")}>
      <div className="grid grid-cols-1 gap-3 sm:grid-cols-3">
        {MODE_CARDS.map(({ mode: m, Icon }) => {
          const selected = mode === m;
          return (
            <button
              key={m}
              type="button"
              onClick={() => setMode(m)}
              aria-pressed={selected}
              data-testid={`onboarding-mode-${m}`}
              className={`rounded-xl border p-2.5 text-left transition-colors ${
                selected
                  ? "border-accent ring-2 ring-accent/40"
                  : "border-border hover:border-border-light"
              }`}
            >
              {m === "system" ? (
                <div className="grid grid-cols-2 overflow-hidden rounded-md">
                  <Swatch mode="dark" name={themeFor.dark} />
                  <Swatch mode="light" name={themeFor.light} />
                </div>
              ) : (
                <Swatch mode={m} name={themeFor[m]} />
              )}
              <span className="flex items-center gap-1.5 px-1 pt-2 text-sm font-medium text-fg-primary">
                <Icon className="h-3.5 w-3.5" />
                {t(`look.modes.${m}`)}
                <span className="ml-auto text-[11px] font-normal text-fg-muted">
                  {t(`look.modeHints.${m}`)}
                </span>
              </span>
            </button>
          );
        })}
      </div>

      {(["dark", "light"] as Theme[]).map((group) => (
        <div key={group} className="space-y-2">
          <p className="text-xs font-medium text-fg-secondary">
            {t(group === "dark" ? "look.darkThemes" : "look.lightThemes")}
          </p>
          <div className="grid grid-cols-2 gap-2 sm:grid-cols-4">
            {THEMES[group].map((name) => {
              const selected = themeFor[group] === name;
              const label = THEME_LABELS[name] ?? ts("appearance.default");
              return (
                <button
                  key={name}
                  type="button"
                  onClick={() => setThemeFor(group, name)}
                  aria-pressed={selected}
                  aria-label={`${t(group === "dark" ? "look.darkThemes" : "look.lightThemes")}: ${label}`}
                  className={`rounded-lg border p-1 text-left transition-colors ${
                    selected
                      ? "border-accent ring-2 ring-accent/40"
                      : "border-border hover:border-border-light"
                  }`}
                >
                  <Swatch mode={group} name={name} />
                  <span className="block px-1 pt-1 text-[11px] text-fg-primary">{label}</span>
                </button>
              );
            })}
          </div>
        </div>
      ))}

      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
        <div className="space-y-2">
          <p className="text-xs font-medium text-fg-secondary">{t("look.language")}</p>
          <SettingsSegmented
            ariaLabel={t("look.language")}
            value={(i18n.resolvedLanguage ?? i18n.language).startsWith("vi") ? "vi" : "en"}
            onChange={(v) => void i18n.changeLanguage(v)}
            options={[
              { value: "en" as const, label: ts("language.names.en") },
              { value: "vi" as const, label: ts("language.names.vi") },
            ]}
          />
        </div>
        <div className="space-y-2">
          <p className="text-xs font-medium text-fg-secondary">{t("look.font")}</p>
          <SettingsSegmented
            ariaLabel={t("look.font")}
            value={font}
            onChange={(f) => {
              writeTerminalFont(f);
              setFont(f);
            }}
            options={(Object.keys(TERMINAL_FONTS) as TerminalFont[]).map((f) => ({
              value: f,
              label: (
                <span style={{ fontFamily: TERMINAL_FONTS[f] }}>
                  {ts(`terminalFont.names.${f}`)}
                </span>
              ),
            }))}
          />
        </div>
      </div>
      <p className="text-xs text-fg-muted">{t("look.more")}</p>
    </StepHead>
  );
}

function NotifyStep() {
  const { t } = useTranslation("onboarding");
  const { t: ts } = useTranslation("settings");
  const [prefs, setPrefs] = useState<NotifPrefs>(loadNotifPrefs);
  const [result, setResult] = useState<string | null>(null);
  const supported = typeof window !== "undefined" && "Notification" in window;
  const [permission, setPermission] = useState(() =>
    supported ? Notification.permission : "default"
  );
  const update = (patch: Partial<NotifPrefs>) => {
    const next = { ...prefs, ...patch };
    saveNotifPrefs(next);
    setPrefs(next);
  };

  const enable = async (on: boolean) => {
    if (!on) return update({ enabled: false });
    if (supported && Notification.permission !== "granted") {
      const perm = await Notification.requestPermission();
      setPermission(perm);
      if (perm !== "granted") return;
    }
    update({ enabled: true });
    await subscribeToPush().catch(() => {
      /* the local fallback still shows them */
    });
  };

  const test = async () => {
    const r = await notify(ts("notifications.testTitle"), ts("notifications.testBody"));
    setResult(
      r.via === "push" || r.via === "native"
        ? ts("notifications.testSent")
        : r.via === "local"
          ? ts("notifications.testLocal")
          : r.via === "blocked"
            ? ts("notifications.testBlocked")
            : ts("notifications.testFailed")
    );
  };

  return (
    <StepHead title={t("notify.title")} body={t("notify.body")}>
      <div className="space-y-4 rounded-xl border border-border bg-surface-2 px-4 py-4">
        <div className="flex items-center gap-3">
          <div className="min-w-0 flex-1">
            <p className="text-sm font-medium text-fg-primary">{t("notify.enable")}</p>
            <p className="text-xs text-fg-muted">{t("notify.enableHint")}</p>
          </div>
          <Switch
            checked={prefs.enabled}
            onChange={(v) => void enable(v)}
            label={t("notify.enable")}
          />
        </div>
        {permission === "denied" && (
          <p className="text-xs text-status-danger">{t("notify.blocked")}</p>
        )}
        <div className="flex flex-wrap items-center gap-2 border-t border-border pt-4">
          <span className="mr-2 text-sm text-fg-primary">{t("notify.sound")}</span>
          <select
            aria-label={t("notify.sound")}
            value={prefs.sound}
            onChange={(e) => {
              const sound = e.target.value as NotifSound;
              update({ sound });
              playSound(sound);
            }}
            className="select py-1 text-xs"
          >
            {NOTIF_SOUNDS.map((k) => (
              <option key={k} value={k}>
                {ts(`notifications.sound.${k}`)}
              </option>
            ))}
          </select>
          <button
            type="button"
            onClick={() => playSound(prefs.sound)}
            disabled={prefs.sound === "none"}
            className="btn-ghost text-xs disabled:opacity-50"
          >
            <Play className="h-3 w-3" />
            {t("notify.preview")}
          </button>
          <button
            type="button"
            onClick={() => void test()}
            className="btn-ghost border border-border text-xs"
          >
            <Zap className="h-3 w-3" />
            {t("notify.test")}
          </button>
        </div>
        {result && (
          <p role="status" className="text-xs text-fg-secondary">
            {result}
          </p>
        )}
      </div>
    </StepHead>
  );
}