import type { ReactNode } from "react";
import Link from "next/link";
import { Badge } from "@/components/ui/badge";
import { StatusBadge } from "@/components/cases/status-badge";
import { SyncIndicator } from "@/components/cases/sync-indicator";
import { CaseArchiveAction } from "@/components/cases/case-archive-action";
import { CreateRepoButton } from "@/components/cases/create-repo-button";
import {
  PRACTICE_AREA_LABELS,
  APPEAL_SUBTYPE_LABELS,
  isBlamSubtype,
} from "@/lib/practice-area";
import type { CaseDetail } from "@/lib/api/cases";

function formatDate(iso?: string | null) {
  if (!iso) return "—";
  try {
    return new Date(iso).toLocaleDateString("he-IL", {
      day: "2-digit",
      month: "2-digit",
      year: "numeric",
    });
  } catch {
    return iso ?? "—";
  }
}

function partiesLine(data?: CaseDetail): string | null {
  const appellant = data?.appellants?.filter(Boolean) ?? [];
  const respondent = data?.respondents?.filter(Boolean) ?? [];
  const parts: string[] = [];
  if (appellant.length) parts.push(`עוררת: ${appellant.join(", ")}`);
  if (respondent.length) parts.push(`משיבה: ${respondent.join(", ")}`);
  return parts.length ? parts.join(" · ") : null;
}

/**
 * Case header — parchment band (IA-redesign mockup 17): full-bleed band with
 * the case title + status/type chips inline, a parties line, the case actions
 * (edit / archive / repo / sync), and a metadata strip. The `tabs` slot renders
 * the tab strip inside the band, anchored to its bottom edge.
 */
export function CaseHeader({
  data,
  actions,
  tabs,
}: {
  data?: CaseDetail;
  actions?: ReactNode;
  tabs?: ReactNode;
}) {
  const parties = partiesLine(data);
  const isBlam =
    data?.proceeding_type === 'בל"מ' || isBlamSubtype(data?.appeal_subtype);

  return (
    <div className="-mx-10 -mt-10 mb-2 bg-parchment border-b border-rule px-10 pt-6">
      <nav className="text-[0.78rem] text-ink-muted mb-3 flex items-center gap-2">
        <Link href="/" className="hover:text-gold-deep">בית</Link>
        <span aria-hidden>·</span>
        <span>תיקי ערר</span>
        <span aria-hidden>·</span>
        <span className="text-navy tabular-nums">{data?.case_number ?? "…"}</span>
      </nav>

      <div className="flex items-start justify-between gap-6 flex-wrap">
        <div className="min-w-0">
          {/* title row — H1 + status/type/blam chips inline (mockup .band h1) */}
          <h1 className="text-navy text-[1.7rem] font-bold leading-tight flex items-center gap-3 flex-wrap mb-0">
            <span className="tabular-nums">
              {data?.proceeding_type ?? "ערר"} {data?.case_number ?? "—"}
            </span>
            {data?.status && <StatusBadge status={data.status} />}
            {data?.archived_at && (
              <Badge
                variant="outline"
                className="rounded-full px-3 py-0.5 text-[0.75rem] font-semibold bg-ink-muted/10 text-ink-muted border-ink-muted/30"
              >
                בארכיון
              </Badge>
            )}
            {data?.practice_area && (
              <Badge
                variant="outline"
                className="rounded-full px-3 py-0.5 text-[0.75rem] font-semibold bg-gold-wash text-gold-deep border-rule"
              >
                {PRACTICE_AREA_LABELS[data.practice_area]}
                {data.appeal_subtype && data.appeal_subtype !== "unknown" && (
                  <> · {APPEAL_SUBTYPE_LABELS[data.appeal_subtype]}</>
                )}
              </Badge>
            )}
            {isBlam && (
              <Badge
                variant="outline"
                className="rounded-full px-3 py-0.5 text-[0.75rem] font-bold bg-warn/10 text-warn-deep border-warn/40"
                title="בקשה להארכת מועד להגשת ערר"
              >
                בל&quot;מ
              </Badge>
            )}
          </h1>

          {/* case title / subject under the heading */}
          {data?.title && (
            <p className="text-navy/90 text-base font-semibold mt-2 max-w-3xl leading-snug">
              {data.title}
            </p>
          )}
          {/* parties line (mockup .parties) */}
          {parties ? (
            <p className="text-ink-soft text-sm mt-1.5">{parties}</p>
          ) : data?.subject ? (
            <p className="text-ink-soft text-sm mt-1.5 max-w-3xl leading-relaxed">
              {data.subject}
            </p>
          ) : null}

          {/* case actions — kept verbatim, moved into the band */}
          <div className="flex items-center gap-2 flex-wrap mt-3">
            {data?.case_number && (
              <CaseArchiveAction
                caseNumber={data.case_number}
                archivedAt={data.archived_at}
              />
            )}
            <CreateRepoButton data={data} />
            {actions}
          </div>
        </div>

        {/* metadata strip — hearing date / updated / sync */}
        <dl className="grid grid-cols-2 gap-x-6 gap-y-1 text-sm shrink-0">
          <dt className="text-ink-muted text-[0.72rem] uppercase tracking-wider">
            תאריך דיון
          </dt>
          <dd className="text-ink-soft tabular-nums">{formatDate(data?.hearing_date)}</dd>
          <dt className="text-ink-muted text-[0.72rem] uppercase tracking-wider">
            עודכן
          </dt>
          <dd className="text-ink-soft tabular-nums">{formatDate(data?.updated_at)}</dd>
          <dt className="text-ink-muted text-[0.72rem] uppercase tracking-wider">
            סנכרון
          </dt>
          <dd><SyncIndicator caseNumber={data?.case_number} /></dd>
        </dl>
      </div>

      {/* tab strip anchored to band bottom (mockup .tabs) */}
      {tabs ? <div className="mt-5">{tabs}</div> : null}
    </div>
  );
}