"use client";

import Link from "next/link";
import { AppShell } from "@/components/app-shell";
import { Card, CardContent } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import {
  usePendingApprovals,
  type ApprovalCategory,
  type ApprovalSeverity,
} from "@/lib/api/chair";

/**
 * מרכז אישורים — דפנה (INV-G10).
 *
 * עמוד אחד שמרכז את כל השערים האנושיים הממתינים להכרעת היו"ר: אישור הלכות,
 * פסיקה חסרה, הערות שטרם יושמו, ותיקים שנכשלו ב-QA. המטרה:
 * שאף פריט הדורש את אישורך לא יישכח. הנתונים נשלפים חי מ-/api/chair/pending.
 */
// Severity expressed as a colored dot next to the title (matches the approved
// IA-redesign mockup): high=danger, medium=warn, low=info, ok=success.
const SEVERITY_DOT: Record<ApprovalSeverity, string> = {
  high: "bg-danger",
  medium: "bg-warn",
  low: "bg-info",
  ok: "bg-success",
};

function formatDate(iso?: string | null): string {
  if (!iso) return "";
  try {
    return new Date(iso).toLocaleDateString("he-IL", {
      day: "numeric",
      month: "long",
      year: "numeric",
    });
  } catch {
    return "";
  }
}

function ApprovalCard({ cat }: { cat: ApprovalCategory }) {
  const cleared = cat.count === 0;
  return (
    <Card className="bg-surface border-rule shadow-sm flex flex-col overflow-hidden">
      <CardContent className="p-0 flex flex-col grow">
        {/* top row — severity dot · title+age · big count number (mockup 01) */}
        <div className="flex items-start gap-3 px-5 pt-5 pb-2">
          <span
            className={`mt-2 h-2.5 w-2.5 shrink-0 rounded-full ${SEVERITY_DOT[cat.severity]}`}
            aria-hidden
          />
          <div className="grow min-w-0">
            <h2 className="text-navy text-base font-semibold mb-0 leading-snug">{cat.label}</h2>
            <div className="text-[0.78rem] text-ink-muted mt-0.5">
              {cleared ? (
                <span className="inline-block rounded-full bg-success-bg text-success text-[0.72rem] px-2.5 py-0.5 font-medium">
                  תור נקי
                </span>
              ) : cat.oldest_at ? (
                <>הוותיק ביותר — {formatDate(cat.oldest_at)}</>
              ) : (
                cat.description
              )}
            </div>
          </div>
          <span
            className="text-3xl font-bold text-navy leading-none tabular-nums shrink-0"
            aria-label={`${cat.count} פריטים ממתינים`}
          >
            {cat.count}
          </span>
        </div>

        {/* description kept (subtle) when the age line took the title slot */}
        {!cleared && cat.oldest_at ? (
          <p className="px-5 text-[0.8rem] text-ink-muted leading-relaxed mb-0">{cat.description}</p>
        ) : null}

        {cat.extra ? (
          <p className="px-5 mt-1 text-[0.78rem] text-ink-muted mb-0">
            סך {cat.extra.total} שאילתות · {cat.extra.reviewed} אושרו על־ידך
          </p>
        ) : null}

        {!cleared && cat.sample && cat.sample.length > 0 ? (
          <ul className="mt-3 px-5 border-t border-rule-soft">
            {cat.sample.map((s, i) => {
              const row = (
                <div className="flex items-start gap-2">
                  <span className="line-clamp-2 text-ink-soft">{s.text || "—"}</span>
                  {s.source ? (
                    <span className="text-ink-muted text-[0.72rem] ms-auto shrink-0 whitespace-nowrap">
                      {s.source}
                    </span>
                  ) : null}
                </div>
              );
              return (
                <li
                  key={i}
                  className="text-[0.82rem] py-2.5 border-b border-rule-soft last:border-b-0"
                >
                  {s.href ? (
                    <Link href={s.href} className="block hover:text-gold-deep">
                      {row}
                    </Link>
                  ) : (
                    row
                  )}
                </li>
              );
            })}
          </ul>
        ) : cleared ? (
          <p className="px-5 mt-2 text-[0.85rem] text-ink-muted mb-0">
            אין פריטים הממתינים להתייחסות. כל התיקים עברו בדיקת-איכות.
          </p>
        ) : null}

        {/* foot — gold CTA when actionable, quiet outline when cleared */}
        <div className="mt-auto px-5 pt-4 pb-5">
          {cat.href ? (
            cleared ? (
              <Button asChild variant="outline" size="sm" className="border-rule text-ink-muted">
                <Link href={cat.href}>צפייה ←</Link>
              </Button>
            ) : (
              <Button
                asChild
                size="sm"
                className="bg-gold text-white hover:bg-gold-deep border-transparent"
              >
                <Link href={cat.href}>לטיפול ←</Link>
              </Button>
            )
          ) : (
            <span className="text-[0.75rem] text-ink-muted">סקירה ידנית (ראה דוח FU-5)</span>
          )}
        </div>
      </CardContent>
    </Card>
  );
}

export default function ApprovalsPage() {
  const { data, isPending, error } = usePendingApprovals();

  return (
    <AppShell>
      <section className="space-y-6">
        <header className="space-y-1.5">
          <nav className="text-[0.78rem] text-ink-muted mb-1">
            <Link href="/" className="hover:text-gold-deep">בית</Link>
            <span aria-hidden> · </span>
            <span className="text-navy">מרכז אישורים</span>
          </nav>
          <div className="flex items-end justify-between gap-4 flex-wrap">
            <div className="space-y-1">
              <div className="text-[0.75rem] uppercase tracking-[0.12em] text-gold-deep">
                שערים אנושיים · יו״ר הוועדה
              </div>
              <h1 className="text-navy mb-0">מרכז אישורים</h1>
              <p className="text-ink-muted text-sm mt-1 max-w-2xl leading-relaxed">
                כל מה שממתין להכרעתך במקום אחד — כדי שאף פריט לא יישכח. מתעדכן חי.
              </p>
            </div>
            {typeof data?.total_pending === "number" ? (
              <div className="inline-flex items-baseline gap-2 rounded-lg border border-rule bg-gold-wash px-4 py-2.5">
                <span className="text-2xl font-semibold text-gold-deep leading-none tabular-nums">
                  {data.total_pending}
                </span>
                <span className="text-[0.85rem] text-ink-soft">פריטים ממתינים</span>
              </div>
            ) : null}
          </div>
        </header>

        <div className="h-[2px] bg-gradient-to-l from-transparent via-gold to-transparent" />

        {error ? (
          <Card className="bg-surface border-rule">
            <CardContent className="px-6 py-5 text-ink-muted text-sm">
              שגיאה בטעינת מרכז האישורים. נסה לרענן.
            </CardContent>
          </Card>
        ) : isPending ? (
          <div className="grid gap-5 md:grid-cols-2 xl:grid-cols-3">
            {[0, 1, 2, 3, 4].map((i) => (
              <Card key={i} className="bg-surface border-rule shadow-sm">
                <CardContent className="px-6 py-5 h-44 animate-pulse" />
              </Card>
            ))}
          </div>
        ) : (
          <div className="grid gap-5 md:grid-cols-2 xl:grid-cols-3">
            {(data?.categories ?? []).map((cat) => (
              <ApprovalCard key={cat.key} cat={cat} />
            ))}
          </div>
        )}
      </section>
    </AppShell>
  );
}