import { useState } from "react";
import { useParams, Link } from "wouter";
import { useLanguage } from "../contexts/LanguageContext";
import { Reveal } from "../components/Reveal";
import { Card, CardContent } from "@/components/ui/card";
import { Users, Info, Check, Building2 } from "lucide-react";

type TabKey = "visionMission" | "goalsPillars" | "advantagesDomains";

function ListBlock({ title, items }: { title: string; items: string[] }) {
  return (
    <div>
      <h3 className="text-lg font-bold text-primary mb-4">{title}</h3>
      <ul className="space-y-3">
        {items.map((item, i) => (
          <li key={i} className="flex items-start gap-3">
            <Check className="w-5 h-5 text-primary shrink-0 mt-0.5" />
            <span className="text-foreground/90 leading-relaxed">{item}</span>
          </li>
        ))}
      </ul>
    </div>
  );
}

function StatementBlock({ title, text }: { title: string; text: string }) {
  return (
    <div>
      <h3 className="text-lg font-bold text-primary mb-3">{title}</h3>
      <p className="text-foreground/90 leading-loose">{text}</p>
    </div>
  );
}

export default function About() {
  const { t } = useLanguage();
  const params = useParams<{ section?: string }>();
  const isCommittees = params.section === "committees";
  const [tab, setTab] = useState<TabKey>("visionMission");

  const tabs: { key: TabKey; label: string }[] = [
    { key: "visionMission", label: t.about.tabVisionMission },
    { key: "goalsPillars", label: t.about.tabGoalsPillars },
    { key: "advantagesDomains", label: t.about.tabAdvantagesDomains },
  ];

  return (
    <div className="container mx-auto px-4 py-10">
      {/* Section toggle: Who we are / Committees */}
      <div className="flex justify-end mb-8">
        <div className="inline-flex rounded-full border border-border bg-muted/40 p-1">
          <Link
            href="/about"
            className={`inline-flex items-center gap-2 rounded-full px-5 py-2 text-sm font-medium transition-colors ${
              !isCommittees
                ? "bg-primary/10 text-primary"
                : "text-muted-foreground hover:text-primary"
            }`}
            data-testid="about-tab-whoWeAre"
          >
            <Info className="w-4 h-4" />
            {t.about.whoWeAre}
          </Link>
          <Link
            href="/about/committees"
            className={`inline-flex items-center gap-2 rounded-full px-5 py-2 text-sm font-medium transition-colors ${
              isCommittees
                ? "bg-primary/10 text-primary"
                : "text-muted-foreground hover:text-primary"
            }`}
            data-testid="about-tab-committees"
          >
            <Users className="w-4 h-4" />
            {t.about.committees}
          </Link>
        </div>
      </div>

      {isCommittees ? (
        <Reveal>
          <h1 className="text-2xl font-bold text-foreground mb-3">{t.about.committeesTitle}</h1>
          <p className="text-muted-foreground mb-8 max-w-3xl leading-relaxed">
            {t.about.committeesIntro}
          </p>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
            {t.about.committeeItems.map((c, i) => (
              <Reveal key={i} delay={(i % 2) * 0.08} className="h-full">
                <Card className="h-full">
                  <CardContent className="p-6 flex items-start gap-4">
                    <div className="w-11 h-11 rounded-xl bg-primary/10 text-primary flex items-center justify-center shrink-0">
                      <Building2 className="w-5 h-5" />
                    </div>
                    <div>
                      <h3 className="text-base font-bold text-foreground mb-1">{c.name}</h3>
                      <p className="text-sm text-muted-foreground leading-relaxed">{c.desc}</p>
                    </div>
                  </CardContent>
                </Card>
              </Reveal>
            ))}
          </div>
        </Reveal>
      ) : (
        <>
          {/* Intro green panel */}
          <Reveal>
            <section className="rounded-2xl bg-primary text-primary-foreground p-8 md:p-12 mb-10">
              <h1 className="text-2xl md:text-3xl font-bold mb-5">{t.about.introTitle}</h1>
              <p className="leading-loose text-primary-foreground/90 max-w-4xl">
                {t.about.intro}
              </p>
            </section>
          </Reveal>

          {/* Tabs */}
          <Reveal>
            <div className="border-b border-border mb-8">
              <div className="flex flex-wrap gap-2">
                {tabs.map((tb) => (
                  <button
                    key={tb.key}
                    type="button"
                    onClick={() => setTab(tb.key)}
                    data-testid={`about-section-${tb.key}`}
                    className={`px-4 py-3 text-sm font-medium border-b-2 -mb-px transition-colors ${
                      tab === tb.key
                        ? "border-primary text-primary"
                        : "border-transparent text-muted-foreground hover:text-primary"
                    }`}
                  >
                    {tb.label}
                  </button>
                ))}
              </div>
            </div>
          </Reveal>

          {/* Tab content */}
          <Reveal>
            <div className="grid grid-cols-1 md:grid-cols-2 gap-8 md:gap-12">
              {tab === "visionMission" && (
                <>
                  <StatementBlock title={t.about.visionTitle} text={t.about.visionText} />
                  <StatementBlock title={t.about.missionTitle} text={t.about.missionText} />
                </>
              )}
              {tab === "goalsPillars" && (
                <>
                  <ListBlock title={t.about.goalsTitle} items={t.about.goals} />
                  <ListBlock title={t.about.pillarsTitle} items={t.about.pillars} />
                </>
              )}
              {tab === "advantagesDomains" && (
                <>
                  <ListBlock title={t.about.advantagesTitle} items={t.about.advantages} />
                  <ListBlock title={t.about.domainsTitle} items={t.about.domains} />
                </>
              )}
            </div>
          </Reveal>
        </>
      )}
    </div>
  );
}