"use client";

import { useMemo, useState } from "react";
import Link from "next/link";
import {
  flexRender,
  getCoreRowModel,
  getFilteredRowModel,
  getSortedRowModel,
  useReactTable,
  type ColumnDef,
  type SortingState,
} from "@tanstack/react-table";
import { toast } from "sonner";
import { AppShell } from "@/components/app-shell";
import { Card, CardContent } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Skeleton } from "@/components/ui/skeleton";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { useCases, useRestoreCase, type Case } from "@/lib/api/cases";
import { subtypeOf } from "@/components/cases/appeal-type-bars";
import { APPEAL_SUBTYPE_LABELS, type AppealSubtype } from "@/lib/practice-area";
import { formatDate, getIsraelYear } from "@/lib/format-date";

// type chip styling per mockup 05 (.t-lic / .t-bet / .t-comp)
const TYPE_CHIP: Record<string, string> = {
  building_permit: "bg-info-bg text-info",
  betterment_levy: "bg-gold-wash text-gold-deep border border-rule",
  compensation_197: "bg-rule-soft text-ink-soft",
};

// outcome chip styling per mockup 05 (.r-acc / .r-rej / .r-part)
const OUTCOME_CHIP: Record<string, { label: string; cls: string }> = {
  full_acceptance: { label: "התקבל", cls: "bg-success-bg text-success" },
  partial_acceptance: { label: "חלקי", cls: "bg-warn-bg text-warn" },
  rejection: { label: "נדחה", cls: "bg-danger-bg text-danger" },
};

function RestoreButton({ caseNumber }: { caseNumber: string }) {
  const restore = useRestoreCase(caseNumber);
  return (
    <Button
      variant="outline"
      size="sm"
      disabled={restore.isPending}
      onClick={() => {
        restore.mutate(undefined, {
          onSuccess: (res) => {
            const pc = res.paperclip?.status;
            if (pc === "restored") {
              toast.success(`התיק שוחזר. גם הפרויקט ב-Paperclip שוחזר.`);
            } else if (pc === "not_found") {
              toast.success("התיק שוחזר. לא נמצא פרויקט מתאים ב-Paperclip.");
            } else if (pc === "error") {
              toast.warning(
                `התיק שוחזר ב-legal-ai, אך סנכרון Paperclip נכשל: ${res.paperclip?.message ?? ""}`,
              );
            } else {
              toast.success("התיק שוחזר.");
            }
          },
          onError: (err) =>
            toast.error(err instanceof Error ? err.message : "שגיאה בשחזור"),
        });
      }}
    >
      {restore.isPending ? "משחזר..." : "שחזר"}
    </Button>
  );
}

const columns: ColumnDef<Case>[] = [
  {
    accessorKey: "case_number",
    header: "מספר ערר",
    cell: ({ row }) => (
      <Link
        href={`/cases/${row.original.case_number}`}
        className="text-navy font-semibold hover:text-gold-deep tabular-nums"
      >
        {row.original.case_number}
      </Link>
    ),
  },
  {
    accessorKey: "title",
    header: "כותרת",
    cell: ({ row }) => (
      <div className="text-ink-soft max-w-[420px] truncate" title={row.original.title}>
        {row.original.title}
      </div>
    ),
  },
  {
    accessorKey: "appeal_subtype",
    header: "סוג",
    cell: ({ row }) => {
      const s = subtypeOf(row.original);
      if (!s || s === "unknown")
        return <span className="text-ink-muted">—</span>;
      return (
        <span
          className={`inline-block rounded-full px-2.5 py-0.5 text-[0.72rem] font-semibold whitespace-nowrap ${
            TYPE_CHIP[s] ?? "bg-rule-soft text-ink-soft"
          }`}
        >
          {APPEAL_SUBTYPE_LABELS[s as AppealSubtype]}
        </span>
      );
    },
  },
  {
    accessorKey: "expected_outcome",
    header: "תוצאה",
    cell: ({ row }) => {
      const o = row.original.expected_outcome;
      const chip = o ? OUTCOME_CHIP[o] : undefined;
      if (!chip) return <span className="text-ink-muted">—</span>;
      return (
        <span
          className={`inline-block rounded-full px-2.5 py-0.5 text-[0.72rem] font-semibold whitespace-nowrap ${chip.cls}`}
        >
          {chip.label}
        </span>
      );
    },
  },
  {
    accessorKey: "archived_at",
    header: "תאריך ארכוב",
    cell: ({ row }) => (
      <span className="text-ink-muted text-sm tabular-nums whitespace-nowrap">
        {formatDate(row.original.archived_at)}
      </span>
    ),
  },
  {
    id: "actions",
    header: "",
    cell: ({ row }) => <RestoreButton caseNumber={row.original.case_number} />,
  },
];

export default function ArchivePage() {
  const { data, isPending, error } = useCases(true, "archived");
  const [sorting, setSorting] = useState<SortingState>([
    { id: "archived_at", desc: true },
  ]);
  const [globalFilter, setGlobalFilter] = useState("");
  const [typeFilter, setTypeFilter] = useState<string>("all");
  const [yearFilter, setYearFilter] = useState<string>("all");

  const rows = useMemo(() => data ?? [], [data]);

  // years present in the archive (by archive date) — for the year filter (mockup 05)
  const years = useMemo(() => {
    const set = new Set<string>();
    for (const c of rows) {
      if (!c.archived_at) continue;
      const y = getIsraelYear(c.archived_at);
      if (y !== null) set.add(String(y));
    }
    return [...set].sort((a, b) => Number(b) - Number(a));
  }, [rows]);

  const table = useReactTable({
    data: rows,
    columns,
    state: { sorting, globalFilter },
    onSortingChange: setSorting,
    onGlobalFilterChange: setGlobalFilter,
    getCoreRowModel: getCoreRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    globalFilterFn: (row, _colId, filterValue: string) => {
      if (!filterValue) return true;
      const needle = filterValue.toLowerCase();
      return (
        row.original.case_number.toLowerCase().includes(needle) ||
        row.original.title.toLowerCase().includes(needle)
      );
    },
  });

  // domain filter applied client-side (subtypeOf collapses בל"מ variants)
  const filteredRows = useMemo(() => {
    let all = table.getFilteredRowModel().rows;
    if (typeFilter !== "all") all = all.filter((r) => subtypeOf(r.original) === typeFilter);
    if (yearFilter !== "all") {
      all = all.filter((r) => {
        const iso = r.original.archived_at;
        return iso != null && String(getIsraelYear(iso)) === yearFilter;
      });
    }
    return all;
  }, [table, typeFilter, yearFilter, globalFilter, sorting, rows]);

  const total = rows.length;
  const shown = filteredRows.length;

  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">ארכיון</span>
          </nav>
          <div className="space-y-1">
            <div className="text-[0.75rem] uppercase tracking-[0.12em] text-gold-deep">
              ארכיון תיקי ערר
            </div>
            <h1 className="text-navy mb-0">ארכיון</h1>
            <p className="text-ink-muted text-base max-w-2xl leading-relaxed">
              כל ההחלטות שהושלמו — לחיפוש, סינון ועיון. {total} תיקים סגורים.
              שחזור מחזיר את התיק לרשימה הראשית ופותח מחדש את הפרויקט המקביל ב-Paperclip.
            </p>
          </div>
        </header>

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

        {/* filter bar — search + domain select + count aligned to end (mockup 05 .filters) */}
        <div className="flex items-center gap-3 flex-wrap">
          <Input
            value={globalFilter}
            onChange={(e) => setGlobalFilter(e.target.value)}
            placeholder="חיפוש לפי מספר ערר, כותרת או צד…"
            className="flex-1 min-w-[220px] bg-surface"
            dir="rtl"
          />
          <select
            value={typeFilter}
            onChange={(e) => setTypeFilter(e.target.value)}
            className="cursor-pointer text-[0.84rem] text-ink-soft bg-surface border border-rule rounded-lg px-3.5 py-2"
          >
            <option value="all">כל סוגי הערר</option>
            <option value="building_permit">רישוי ובנייה</option>
            <option value="betterment_levy">היטל השבחה</option>
            <option value="compensation_197">פיצויים (ס׳ 197)</option>
          </select>
          {years.length > 0 ? (
            <select
              value={yearFilter}
              onChange={(e) => setYearFilter(e.target.value)}
              className="cursor-pointer text-[0.84rem] text-ink-soft bg-surface border border-rule rounded-lg px-3.5 py-2"
            >
              <option value="all">כל השנים</option>
              {years.map((y) => (
                <option key={y} value={y}>{y}</option>
              ))}
            </select>
          ) : null}
          <span className="ms-auto text-[0.82rem] text-ink-muted tabular-nums">
            מציג {shown} מתוך {total}
          </span>
        </div>

        {/* clean bordered table — parchment header, gold-wash hover (mockup 05 .card table) */}
        <Card className="bg-surface border-rule shadow-sm overflow-hidden p-0">
          <CardContent className="p-0">
            <Table>
              <TableHeader className="bg-parchment">
                {table.getHeaderGroups().map((hg) => (
                  <TableRow key={hg.id} className="border-rule">
                    {hg.headers.map((header) => (
                      <TableHead
                        key={header.id}
                        onClick={header.column.getToggleSortingHandler()}
                        className="text-ink-muted font-medium text-[0.78rem] cursor-pointer select-none text-start"
                      >
                        {flexRender(
                          header.column.columnDef.header,
                          header.getContext(),
                        )}
                        {{ asc: " ▲", desc: " ▼" }[
                          header.column.getIsSorted() as string
                        ] ?? ""}
                      </TableHead>
                    ))}
                  </TableRow>
                ))}
              </TableHeader>
              <TableBody>
                {isPending ? (
                  Array.from({ length: 3 }).map((_, i) => (
                    <TableRow key={i} className="border-rule-soft">
                      {columns.map((_c, j) => (
                        <TableCell key={j}>
                          <Skeleton className="h-4 w-24" />
                        </TableCell>
                      ))}
                    </TableRow>
                  ))
                ) : error ? (
                  <TableRow>
                    <TableCell
                      colSpan={columns.length}
                      className="text-center text-danger py-8"
                    >
                      שגיאה בטעינת ארכיון: {error.message}
                    </TableCell>
                  </TableRow>
                ) : filteredRows.length === 0 ? (
                  <TableRow>
                    <TableCell
                      colSpan={columns.length}
                      className="text-center text-ink-muted py-12"
                    >
                      <div className="text-gold text-2xl mb-2" aria-hidden>
                        ❦
                      </div>
                      {globalFilter || typeFilter !== "all" || yearFilter !== "all"
                        ? "אין תיקים תואמים לחיפוש"
                        : "אין תיקים בארכיון"}
                    </TableCell>
                  </TableRow>
                ) : (
                  filteredRows.map((row) => (
                    <TableRow
                      key={row.id}
                      className="border-rule-soft hover:bg-gold-wash transition-colors"
                    >
                      {row.getVisibleCells().map((cell) => (
                        <TableCell key={cell.id} className="py-3">
                          {flexRender(
                            cell.column.columnDef.cell,
                            cell.getContext(),
                          )}
                        </TableCell>
                      ))}
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
          </CardContent>
        </Card>
      </section>
    </AppShell>
  );
}