import { CalendarDays, HeartPulse, Smartphone, Sparkles, Users } from "lucide-react";
import type { ReactNode } from "react";
import { useTranslation } from "react-i18next";
import { Link, useNavigate } from "react-router-dom";
import { attemptOpenNativeApp, isAndroidPhoneBrowser } from "../../lib/mobile-app-redirect";
import "./landing-page.scss";

/**
 * Public marketing page shown at `/` to a logged-out visitor (see
 * `RequireAuth` for how it's wired in without touching the route table).
 * All copy comes from i18next under the `landing.*` namespace — no
 * hardcoded JSX text, same convention as every other page.
 *
 * Deliberately dependency-free for visuals: the hero illustration is an
 * inline stroke-drawn SVG in the same visual language as `lucide-react`
 * (the icon set already used everywhere), not an imported illustration
 * library or an external asset — same choice `TechStepCorrectionPopover`
 * made for its own hand-drawn icons. The three preview images are real
 * app screenshots served statically from `public/landing/` (see that
 * folder's README); a missing file just falls back to its `alt` text and
 * never breaks the build.
 */
export function LandingPage() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  // UA-based, not `useIsMobileViewport()` — same reasoning as
  // `attemptOpenNativeApp`'s own doc comment: this decides whether trying
  // to open the *native app* makes sense at all (a platform question), not
  // whether the viewport is narrow (a resized desktop window shouldn't
  // attempt a scheme navigation just because it's a small window).
  const isMobile = isAndroidPhoneBrowser();

  function handleOpenApp() {
    attemptOpenNativeApp({ onFallback: () => navigate("/telecharger") });
  }

  const features: { icon: ReactNode; key: "planning" | "import" | "health" | "household" }[] = [
    { icon: <CalendarDays aria-hidden />, key: "planning" },
    { icon: <Sparkles aria-hidden />, key: "import" },
    { icon: <HeartPulse aria-hidden />, key: "health" },
    { icon: <Users aria-hidden />, key: "household" },
  ];

  const shots: { src: string; key: "planning" | "recipe" | "cookingSession" }[] = [
    { src: "/landing/planning.png", key: "planning" },
    { src: "/landing/recipe.png", key: "recipe" },
    { src: "/landing/cooking-session.png", key: "cookingSession" },
  ];

  return (
    <main className="landing">
      <section className="landing__hero">
        <div className="landing__hero-copy">
          <p className="landing__wordmark">batchCooking</p>
          <h1>{t("landing.hero.title")}</h1>
          <p className="landing__lede">{t("landing.hero.lede")}</p>
          <div className="landing__cta-row">
            {/*
             * Issue #85: on a real Android phone browser, opening/getting
             * the app is more useful than a web account — the web
             * experience isn't optimized for mobile at all (the whole
             * point of this chantier), and someone with the app already
             * installed can sign up/log in from inside it just as well.
             * So this becomes the *primary* action, demoting Signup/Login
             * to secondary rather than hiding them — some visitors
             * genuinely want the browser flow, e.g. to try it before
             * installing anything. Desktop is untouched: a scheme-open
             * attempt makes no sense there, so Signup stays primary and
             * this button doesn't render at all (see the plain `/telecharger`
             * link below instead, replacing the old direct-APK link).
             */}
            {isMobile && (
              <button
                type="button"
                className="landing__cta landing__cta--primary"
                onClick={handleOpenApp}
              >
                <Smartphone aria-hidden />
                {t("landing.hero.ctaOpenApp")}
              </button>
            )}
            <Link
              className={
                isMobile
                  ? "landing__cta landing__cta--secondary"
                  : "landing__cta landing__cta--primary"
              }
              to="/signup"
            >
              {t("landing.hero.ctaSignup")}
            </Link>
            <Link className="landing__cta landing__cta--secondary" to="/login">
              {t("landing.hero.ctaLogin")}
            </Link>
          </div>
          {/*
           * Desktop only — a scheme-open attempt (the mobile button above)
           * has no meaning here. Routed through `/telecharger` (the same
           * fallback page a failed mobile attempt lands on) rather than
           * linking `${API_BASE_URL}/mobile/download` directly, so "get
           * the app" has exactly one canonical destination app-wide
           * instead of two slightly different mechanisms to keep in sync.
           */}
          {!isMobile && (
            <Link className="landing__mobile-link" to="/telecharger">
              <Smartphone aria-hidden />
              {t("landing.hero.mobileDownload")}
            </Link>
          )}
        </div>
        <HeroIllustration />
      </section>

      <section className="landing__features" aria-labelledby="landing-features-title">
        <h2 id="landing-features-title">{t("landing.features.title")}</h2>
        <ul className="landing__feature-grid">
          {features.map(({ icon, key }) => (
            <li key={key} className="landing__feature">
              <span className="landing__feature-icon">{icon}</span>
              <h3>{t(`landing.features.${key}.title`)}</h3>
              <p>{t(`landing.features.${key}.body`)}</p>
            </li>
          ))}
        </ul>
      </section>

      <section className="landing__preview" aria-labelledby="landing-preview-title">
        <h2 id="landing-preview-title">{t("landing.preview.title")}</h2>
        <div className="landing__shots">
          {shots.map(({ src, key }) => (
            <figure key={key} className="landing__shot">
              <img src={src} alt={t(`landing.preview.${key}Alt`)} loading="lazy" />
              <figcaption>{t(`landing.preview.${key}Caption`)}</figcaption>
            </figure>
          ))}
        </div>
      </section>

      <section className="landing__final-cta">
        <h2>{t("landing.finalCta.title")}</h2>
        <Link className="landing__cta landing__cta--primary" to="/signup">
          {t("landing.finalCta.button")}
        </Link>
      </section>
    </main>
  );
}

/**
 * Hero illustration — a week grid with a simmering pot, drawn in the same
 * 2px round-stroke `currentColor` language as the lucide icon set so it
 * sits visually with the rest of the app. No external asset.
 */
function HeroIllustration() {
  return (
    <svg
      className="landing__hero-art"
      viewBox="0 0 240 200"
      fill="none"
      stroke="currentColor"
      strokeWidth={2}
      strokeLinecap="round"
      strokeLinejoin="round"
      aria-hidden
    >
      {/* week grid */}
      <rect x="18" y="26" width="150" height="118" rx="10" />
      <line x1="18" y1="56" x2="168" y2="56" />
      <line x1="63" y1="56" x2="63" y2="144" />
      <line x1="108" y1="56" x2="108" y2="144" />
      <line x1="138" y1="56" x2="138" y2="144" />
      <line x1="18" y1="86" x2="168" y2="86" />
      <line x1="18" y1="115" x2="168" y2="115" />
      {/* a couple of "planned" chips */}
      <rect x="26" y="64" width="30" height="12" rx="6" />
      <rect x="71" y="93" width="30" height="12" rx="6" />
      <rect x="116" y="123" width="16" height="12" rx="6" />
      {/* simmering pot, front-right */}
      <path d="M150 150h74a8 8 0 0 1 8 8v18a20 20 0 0 1-20 20h-50a20 20 0 0 1-20-20v-18a8 8 0 0 1 8-8Z" />
      <line x1="142" y1="150" x2="128" y2="150" />
      <line x1="232" y1="150" x2="246" y2="150" />
      <path d="M164 138c-4-6 2-10 0-16" />
      <path d="M188 136c-4-6 2-10 0-16" />
      <path d="M212 138c-4-6 2-10 0-16" />
    </svg>
  );
}