"use client";

import { use, useRef, useState } from "react";
import Link from "next/link";
import { FileText } from "lucide-react";
import { AppShell } from "@/components/app-shell";
import { Card, CardContent } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Skeleton } from "@/components/ui/skeleton";
import {
  Accordion,
  AccordionContent,
  AccordionItem,
  AccordionTrigger,
} from "@/components/ui/accordion";
import { SubsectionCard } from "@/components/compose/subsection-card";
import { PrecedentsSection } from "@/components/compose/precedents-section";
import { CitationVerificationPanel } from "@/components/compose/citation-verification-panel";
import { DecisionBlocksPanel } from "@/components/cases/decision-blocks-panel";
import { StatusBadge } from "@/components/cases/status-badge";
import { Markdown } from "@/components/ui/markdown";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { useCase } from "@/lib/api/cases";
import {
  useCaseLearningStatus,
  type CaseLearningStatus,
} from "@/lib/api/learning";
import { useResearchAnalysis } from "@/lib/api/research";
import { useCasePrecedents } from "@/lib/api/precedents";
import { APPEAL_SUBTYPES } from "@/lib/practice-area";
import { DOC_TYPE_LABELS, type DocType } from "@/lib/doc-types";

function subtypeLabel(subtype?: string | null): string | null {
  if (!subtype) return null;
  return APPEAL_SUBTYPES.find((s) => s.value === subtype)?.label ?? null;
}

// ── Staged-pipeline indicator text (mockup 03) — derived from the live
// learning-status, same source as the drafts-panel LearningStatusBadges. ──────
function voiceLearningText(s?: CaseLearningStatus): string {
  if (!s?.final_uploaded) return "ממתין להעלאת הסופי";
  const v = s.voice_learning;
  if (v.outcome === "succeeded") {
    const bits = [`${v.lessons_count} לקחים הופקו`];
    if (v.lessons_proposed > 0) bits.push(`${v.lessons_proposed} הוצעו לאישור`);
    return `✓ הושלם · ${bits.join(" · ")}`;
  }
  if (v.outcome === "failed") return v.error ? `✗ נכשל — ${v.error}` : "✗ נכשל";
  return "ממתין להרצה";
}

function halachaExtractionText(s?: CaseLearningStatus): string {
  if (!s?.final_uploaded) return "ממתין להעלאת הסופי";
  const h = s.halacha_extraction;
  if (!h.enrolled_in_corpus)
    return h.not_enrolled_reason ?? "לא נכנס לקורפוס-הפסיקה";
  switch (h.status) {
    case "completed":
      return `✓ הושלם · חולצו ${h.halachot_count} · ${h.approved} אושרו · ${h.rejected} נדחו`;
    case "processing":
      return "רץ עכשיו…";
    case "pending":
    case "busy":
      return "בתור";
    case "partial":
      return `חלקי · חולצו ${h.halachot_count}`;
    case "failed":
    case "extraction_failed":
      return "✗ נכשל";
    case "no_chunks":
      return "אין טקסט לחילוץ";
    default:
      return "ממתין להרצה";
  }
}

function ProseSection({ title, content }: { title: string; content?: string }) {
  if (!content?.trim()) return null;
  return (
    <section className="space-y-2">
      <h3 className="text-[0.78rem] uppercase tracking-[0.08em] text-gold-deep font-semibold">
        {title}
      </h3>
      <Markdown content={content.trim()} />
    </section>
  );
}

// ── "השלמה והעברה" rail card — DOCX export, upload, download (all real) ──────
function FinishRail({
  caseNumber,
  hasAnalysis,
  onUploaded,
}: {
  caseNumber: string;
  hasAnalysis: boolean;
  onUploaded: () => void;
}) {
  const fileRef = useRef<HTMLInputElement>(null);
  const [uploading, setUploading] = useState(false);
  const [uploadMsg, setUploadMsg] = useState<{ ok: boolean; text: string } | null>(null);
  const learning = useCaseLearningStatus(caseNumber);

  async function handleUpload(file: File) {
    setUploading(true);
    setUploadMsg(null);
    try {
      const form = new FormData();
      form.append("file", file);
      const res = await fetch(`/api/cases/${caseNumber}/research/analysis/upload`, {
        method: "PUT",
        body: form,
      });
      const data = await res.json();
      if (!res.ok) {
        setUploadMsg({ ok: false, text: data.detail || "שגיאה בהעלאה" });
        return;
      }
      setUploadMsg({
        ok: true,
        text: `הקובץ הועלה — ${data.sections.threshold_claims} טענות סף, ${data.sections.issues} סוגיות`,
      });
      onUploaded();
    } catch {
      setUploadMsg({ ok: false, text: "שגיאת רשת" });
    } finally {
      setUploading(false);
      if (fileRef.current) fileRef.current.value = "";
    }
  }

  return (
    <Card className="bg-surface border-rule shadow-sm">
      <CardContent className="px-4 py-4">
        <h3 className="text-navy text-[0.9rem] font-semibold mb-3">השלמה והעברה</h3>

        <input
          ref={fileRef}
          type="file"
          accept=".md"
          className="hidden"
          onChange={(e) => {
            const f = e.target.files?.[0];
            if (f) handleUpload(f);
          }}
        />

        <div className="space-y-2">
          {hasAnalysis && (
            <Button
              variant="outline"
              className="w-full justify-center"
              onClick={() => {
                const a = document.createElement("a");
                a.href = `/api/cases/${caseNumber}/research/analysis/export-docx`;
                a.click();
              }}
            >
              ייצוא DOCX
            </Button>
          )}
          <Button
            className="w-full justify-center bg-gold text-white hover:bg-gold-deep"
            disabled={uploading}
            onClick={() => fileRef.current?.click()}
          >
            {uploading ? "מעלה…" : "העלאת ניתוח מעודכן"}
          </Button>
          {hasAnalysis && (
            <Button
              variant="outline"
              className="w-full justify-center"
              onClick={() => {
                const a = document.createElement("a");
                a.href = `/api/cases/${caseNumber}/research/analysis/download`;
                a.download = `analysis-${caseNumber}.md`;
                a.click();
              }}
            >
              הורד ניתוח (MD)
            </Button>
          )}
        </div>

        {uploadMsg && (
          <p className={`text-xs mt-2 ${uploadMsg.ok ? "text-success" : "text-danger"}`}>
            {uploadMsg.text}
          </p>
        )}

        {/* mockup 03: stage indicators — informational pointers, not actions */}
        <div className="mt-3 space-y-0">
          <div className="text-[0.78rem] text-ink-muted pt-2 border-t border-rule-soft">
            <b className="text-navy">הרץ למידת-קול</b> — {voiceLearningText(learning.data)}
          </div>
          <div className="text-[0.78rem] text-ink-muted pt-2 mt-2 border-t border-rule-soft">
            <b className="text-navy">הרץ אימות-הלכות</b> — {halachaExtractionText(learning.data)}
          </div>
        </div>

        <Button asChild variant="ghost" className="w-full justify-center mt-3 text-ink-muted">
          <Link href={`/cases/${caseNumber}`}>חזרה לתיק</Link>
        </Button>
      </CardContent>
    </Card>
  );
}

export default function ComposePage({
  params,
}: {
  params: Promise<{ caseNumber: string }>;
}) {
  const { caseNumber } = use(params);
  const caseQuery = useCase(caseNumber);
  const analysis = useResearchAnalysis(caseNumber);
  const precedentsQuery = useCasePrecedents(caseNumber);

  /* Partition the flat list into scopes so each child renders its own slice
   * without re-fetching. Done once at the page level. */
  const allPrecedents = precedentsQuery.data ?? [];
  const caseLevelPrecedents = allPrecedents.filter((p) => p.section_id === null);
  const precedentsBySection = new Map<string, typeof allPrecedents>();
  for (const p of allPrecedents) {
    if (p.section_id) {
      const existing = precedentsBySection.get(p.section_id) ?? [];
      existing.push(p);
      precedentsBySection.set(p.section_id, existing);
    }
  }
  const practiceArea = caseQuery.data?.practice_area ?? null;
  const subtype = subtypeLabel(caseQuery.data?.appeal_subtype);
  const parties = (() => {
    const c = caseQuery.data;
    if (!c) return null;
    const app = c.appellants?.length ? c.appellants.join(", ") : null;
    const resp = c.respondents?.length ? c.respondents.join(", ") : null;
    const out: string[] = [];
    if (app) out.push(`עוררים: ${app}`);
    if (resp) out.push(`משיבה: ${resp}`);
    return out.length ? out.join(" · ") : c.title || null;
  })();
  const documents = caseQuery.data?.documents ?? [];

  const isNotFound =
    analysis.error instanceof Error &&
    /404|לא נמצא|טרם בוצע/.test(analysis.error.message);

  return (
    <AppShell>
      {/* ── Case header band (mockup 03) — parchment strip, full-bleed to the
          AppShell <main> edges (which pads px-10 py-10) ── */}
      <div className="-mx-10 -mt-10 mb-6 border-b border-rule bg-parchment px-10 py-5">
        <nav className="text-[0.78rem] text-ink-muted flex items-center gap-2 mb-2">
          <Link href="/" className="hover:text-gold-deep">בית</Link>
          <span aria-hidden>·</span>
          <Link href={`/cases/${caseNumber}`} className="hover:text-gold-deep">
            ערר {caseNumber}
          </Link>
          <span aria-hidden>·</span>
          <span className="text-navy">עורך החלטה</span>
        </nav>
        <Link
          href={`/cases/${caseNumber}`}
          className="inline-flex items-center gap-1.5 mb-3 rounded-md border border-rule bg-surface px-3 py-1.5 text-[0.82rem] font-semibold text-gold-deep hover:bg-gold-wash hover:text-navy transition-colors"
        >
          <span aria-hidden>→</span> חזרה לדף התיק
        </Link>
        <div className="flex items-center gap-3 flex-wrap">
          <h1 className="text-navy text-2xl font-bold mb-0">ערר {caseNumber}</h1>
          {/* read-only status chip — reuses the shared StatusBadge (G2: no
              parallel status map). Status is changed only in the overview hero. */}
          {caseQuery.data?.status && <StatusBadge status={caseQuery.data.status} />}
          {subtype && (
            <span className="rounded-full text-[0.78rem] font-semibold px-3 py-0.5 border border-rule bg-gold-wash text-gold-deep">
              {subtype}
            </span>
          )}
          {/* INV-G10: source-of-truth pill — the blocks are the canonical text */}
          <span className="ms-auto rounded-lg text-[0.8rem] font-semibold px-3.5 py-1.5 border border-gold bg-gold-wash text-gold-deep">
            מקור-אמת: בלוקים
          </span>
        </div>
        {parties && <p className="text-ink-soft text-sm mt-2">{parties}</p>}
      </div>

      {caseQuery.isPending ? (
        <Card className="bg-surface border-rule shadow-sm">
          <CardContent className="px-6 py-5 space-y-3">
            <Skeleton className="h-6 w-48" />
            <Skeleton className="h-4 w-96" />
            <Skeleton className="h-4 w-80" />
            <Skeleton className="h-32 w-full" />
          </CardContent>
        </Card>
      ) : (
        /* ── Full-width workspace (mockup 03b): no side rail; the case-docs
             table is gone (DocumentsPanel in the overview is the sole owner),
             relocated here as a collapsible doc-strip inside the positions tab. ── */
        <Tabs defaultValue="blocks" dir="rtl">
          <TabsList className="bg-rule-soft/60">
            <TabsTrigger value="blocks">עורך הבלוקים</TabsTrigger>
            <TabsTrigger value="positions">עמדות וטענות</TabsTrigger>
            <TabsTrigger value="verify">אימות פסיקה</TabsTrigger>
          </TabsList>

          {/* Tab 1 — the 12-block decision editor (reused DecisionBlocksPanel) */}
          <TabsContent value="blocks" className="mt-5">
            <DecisionBlocksPanel caseNumber={caseNumber} />
          </TabsContent>

          {/* Tab 3 — citation verification: per-argument support + verify gate (#154) */}
          <TabsContent value="verify" className="mt-5">
            <CitationVerificationPanel caseNumber={caseNumber} />
          </TabsContent>

          {/* Tab 2 — chair positions on the analyst's threshold-claims + issues */}
          <TabsContent value="positions" className="mt-5 space-y-4">
            {/* ★ collapsible doc-strip at the top, closed by default (mockup 03b).
                Read-only pointer to the docs owned by the overview tab. */}
            <Accordion type="single" collapsible>
              <AccordionItem
                value="docs"
                className="overflow-hidden rounded-lg border border-rule bg-surface shadow-sm"
              >
                <AccordionTrigger className="px-4 py-3 hover:no-underline">
                  <span className="flex flex-1 items-center gap-2.5">
                    <FileText className="size-3.5 text-gold-deep" aria-hidden />
                    <span className="text-navy text-[0.85rem] font-semibold">מסמכי התיק</span>
                    <span className="text-ink-muted text-[0.78rem]">
                      {documents.length} מסמכים
                    </span>
                  </span>
                </AccordionTrigger>
                <AccordionContent className="px-4 pb-3.5 pt-0">
                  {documents.length === 0 ? (
                    <p className="text-[0.78rem] text-ink-muted">אין מסמכים מצורפים</p>
                  ) : (
                    <div className="flex flex-wrap gap-2 border-t border-rule-soft pt-3">
                      {documents.map((d) => (
                        <span
                          key={d.id}
                          className="inline-flex items-center gap-1.5 rounded-full border border-rule bg-parchment px-3 py-1 text-[0.78rem] text-ink-soft"
                          title={d.title}
                        >
                          <FileText className="size-3 text-gold-deep shrink-0" aria-hidden />
                          <span className="truncate max-w-[14rem]">{d.title || "מסמך"}</span>
                          <span className="rounded bg-gold-wash text-gold-deep text-[0.66rem] font-semibold px-1.5 py-0.5">
                            {DOC_TYPE_LABELS[d.doc_type as DocType] ?? d.doc_type}
                          </span>
                        </span>
                      ))}
                    </div>
                  )}
                </AccordionContent>
              </AccordionItem>
            </Accordion>

            <p className="text-ink-muted text-[0.78rem]">
              סוגיות-המחלוקת ועמדות הצדדים. עורך עמדת-היו״ר נשמר אוטומטית ומזין את בלוק י׳ (דיון והכרעה).
            </p>

            {analysis.isPending ? (
              <Card className="bg-surface border-rule shadow-sm">
                <CardContent className="px-6 py-5 space-y-3">
                  <Skeleton className="h-6 w-48" />
                  <Skeleton className="h-4 w-96" />
                  <Skeleton className="h-32 w-full" />
                </CardContent>
              </Card>
            ) : isNotFound ? (
              <Card className="bg-surface border-rule shadow-sm">
                <CardContent className="px-6 py-12 text-center space-y-3">
                  <div className="text-gold text-3xl" aria-hidden>❦</div>
                  <h2 className="text-navy text-lg mb-0">
                    טרם בוצע ניתוח משפטי לתיק זה
                  </h2>
                  <p className="text-ink-muted text-sm max-w-md mx-auto">
                    לאחר שקובץ <code>analysis-and-research.md</code> ייווצר, תוכלי
                    לערוך כאן את עמדת הוועדה לכל טענת סף וסוגיה.
                  </p>
                </CardContent>
              </Card>
            ) : analysis.error ? (
              <Card className="bg-danger-bg border-danger/40">
                <CardContent className="px-6 py-5 text-center">
                  <p className="text-danger">{analysis.error.message}</p>
                </CardContent>
              </Card>
            ) : analysis.data ? (
              <div className="space-y-6">
                {/* Threshold claims — laid out 2-up across the full width (mockup 03b) */}
                {analysis.data.threshold_claims &&
                  analysis.data.threshold_claims.length > 0 && (
                    <div className="space-y-3">
                      <div className="flex items-center gap-2">
                        <h2 className="text-navy text-lg font-semibold mb-0">טענות סף</h2>
                        <span className="text-[0.72rem] rounded-full bg-gold-wash text-gold-deep px-2 py-0.5 border border-gold/40 tabular-nums">
                          {analysis.data.threshold_claims.length}
                        </span>
                      </div>
                      <div className="grid gap-3 lg:grid-cols-2 items-start">
                        {analysis.data.threshold_claims.map((tc) => (
                          <SubsectionCard
                            key={tc.id}
                            caseNumber={caseNumber}
                            item={tc}
                            precedents={precedentsBySection.get(tc.id) ?? []}
                            practiceArea={practiceArea}
                          />
                        ))}
                      </div>
                    </div>
                  )}

                {/* Issues — 2-up grid */}
                {analysis.data.issues && analysis.data.issues.length > 0 && (
                  <div className="space-y-3">
                    <div className="flex items-center gap-2">
                      <h2 className="text-navy text-lg font-semibold mb-0">סוגיות להכרעה</h2>
                      <span className="text-[0.72rem] rounded-full bg-gold-wash text-gold-deep px-2 py-0.5 border border-gold/40 tabular-nums">
                        {analysis.data.issues.length}
                      </span>
                    </div>
                    <div className="grid gap-3 lg:grid-cols-2 items-start">
                      {analysis.data.issues.map((iss) => (
                        <SubsectionCard
                          key={iss.id}
                          caseNumber={caseNumber}
                          item={iss}
                          precedents={precedentsBySection.get(iss.id) ?? []}
                          practiceArea={practiceArea}
                        />
                      ))}
                    </div>
                  </div>
                )}

                {!analysis.data.threshold_claims?.length &&
                  !analysis.data.issues?.length && (
                    <Card className="bg-surface border-rule">
                      <CardContent className="px-6 py-10 text-center text-ink-muted">
                        לא נמצאו טענות סף או סוגיות בניתוח זה.
                      </CardContent>
                    </Card>
                  )}

                {/* Background prose — supporting context after the decision points */}
                <Card className="bg-surface border-rule shadow-sm">
                  <CardContent className="px-6 py-5 space-y-5">
                    <h2 className="text-navy text-lg font-semibold mb-0">רקע לניתוח</h2>
                    <ProseSection title="צד מיוצג" content={analysis.data.represented_party} />
                    <ProseSection title="רקע דיוני" content={analysis.data.procedural_background} />
                    <ProseSection title="עובדות מוסכמות" content={analysis.data.agreed_facts} />
                    <ProseSection title="עובדות במחלוקת" content={analysis.data.disputed_facts} />
                  </CardContent>
                </Card>

                {analysis.data.conclusions?.trim() && (
                  <Card className="bg-gold-wash border-gold/40 shadow-sm">
                    <CardContent className="px-6 py-5 space-y-3">
                      <h2 className="text-gold-deep text-lg font-semibold mb-0">מסקנות</h2>
                      <Markdown content={analysis.data.conclusions.trim()} />
                    </CardContent>
                  </Card>
                )}
              </div>
            ) : null}

            {/* ── case-level פסיקה מצורפת + finish/export gates — relocated from
                 the removed side rail; kept inline (INV-IA3: gates not removed). ── */}
            <div className="grid gap-4 lg:grid-cols-2 items-start pt-2">
              {/* פסיקה מצורפת (case-level) — stays inline */}
              <Card className="bg-surface border-rule shadow-sm">
                <CardContent className="px-5 py-4">
                  <h3 className="text-navy text-[0.9rem] font-semibold mb-1">פסיקה מצורפת</h3>
                  <p className="text-[0.72rem] text-ink-muted mb-3">
                    ציטוטים התומכים בעמדה באופן רוחבי — ישולבו בפתיחת בלוק י (דיון).
                  </p>
                  <PrecedentsSection
                    caseNumber={caseNumber}
                    sectionId={null}
                    precedents={caseLevelPrecedents}
                    practiceArea={practiceArea}
                    emptyHelperText="עדיין לא צורפה פסיקה כללית לתיק"
                  />
                </CardContent>
              </Card>

              {/* השלמה והעברה — export/upload gates, relocated not removed */}
              <FinishRail
                caseNumber={caseNumber}
                hasAnalysis={!!analysis.data}
                onUploaded={() => analysis.refetch()}
              />
            </div>
          </TabsContent>
        </Tabs>
      )}
    </AppShell>
  );
}