"use client";

import { Suspense, useMemo, useState } from "react";
import Link from "next/link";
import { useRouter, useSearchParams } from "next/navigation";
import { useQuery } from "@tanstack/react-query";
import { Plus } from "lucide-react";
import { accountingApi } from "@/lib/accounting-api";
import { useTenantId } from "@/hooks/useTenantId";
import { formatMoney } from "@/lib/utils";
import {
  PageHeader,
  Button,
  DataTable,
  EmptyState,
  LoadingState,
  ErrorState,
  Badge,
  JalaliDateText,
  Pagination,
  Select,
} from "@/components/ds";

const STATUS_FA: Record<string, string> = {
  draft: "پیش‌نویس",
  validated: "اعتبارسنجی‌شده",
  posted: "ثبت قطعی",
  reversed: "برگشتی",
  cancelled: "لغو شده",
};

const SOURCE_FA: Record<string, string> = {
  manual: "دستی",
  sales: "فروش (اتومات)",
  purchase: "خرید (اتومات)",
  treasury: "خزانه (اتومات)",
  payroll: "حقوق (اتومات)",
  assets: "دارایی (اتومات)",
};

function sourceLabel(raw: unknown): string {
  const s = String(raw ?? "").trim();
  if (!s || s === "manual") return "دستی";
  return SOURCE_FA[s] ?? `${s} (سیستمی)`;
}

function isAutoSource(raw: unknown): boolean {
  const s = String(raw ?? "").trim();
  return !!s && s !== "manual";
}

const STATUS_TITLES: Record<string, string> = {
  draft: "اسناد پیش‌نویس",
  reversed: "اسناد برگشتی",
  posted: "اسناد ثبت‌قطع‌شده",
};

function VouchersList() {
  const { tenantId } = useTenantId();
  const sp = useSearchParams();
  const router = useRouter();
  const statusFilter = sp.get("status") || "";
  const sourceFilter = sp.get("source") || "";
  const [page, setPage] = useState(1);
  const pageSize = 100;

  const listQ = useQuery({
    queryKey: ["accounting", tenantId, "vouchers", page, pageSize, statusFilter, sourceFilter],
    queryFn: () =>
      accountingApi.vouchers.list(tenantId!, page, pageSize, {
        status: statusFilter || undefined,
        source: sourceFilter || undefined,
      }),
    enabled: !!tenantId,
  });

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

  const setSource = (source: string) => {
    const params = new URLSearchParams();
    if (statusFilter) params.set("status", statusFilter);
    if (source) params.set("source", source);
    const q = params.toString();
    router.push(q ? `/accounting/vouchers?${q}` : "/accounting/vouchers");
    setPage(1);
  };

  if (!tenantId || listQ.isLoading) return <LoadingState />;
  if (listQ.error) return <ErrorState message={listQ.error.message} onRetry={() => listQ.refetch()} />;

  const title =
    sourceFilter === "auto"
      ? "اسناد سیستمی / اتومات"
      : sourceFilter === "manual"
        ? "اسناد دستی"
        : STATUS_TITLES[statusFilter] || "لیست اسناد حسابداری";

  return (
    <div>
      <PageHeader
        title={title}
        description="همه اسناد دفتر کل — دستی و اتومات (فروش، خرید، خزانه و …) از طریق Posting Engine."
        actions={
          <Link href="/accounting/vouchers/new">
            <Button>
              <Plus className="h-4 w-4" />
              سند جدید
            </Button>
          </Link>
        }
      />

      <div className="mb-4 flex flex-wrap items-center gap-3">
        <div className="flex flex-wrap gap-2">
          <Button
            type="button"
            size="sm"
            variant={!sourceFilter ? "default" : "outline"}
            onClick={() => setSource("")}
          >
            همه منابع
          </Button>
          <Button
            type="button"
            size="sm"
            variant={sourceFilter === "auto" ? "default" : "outline"}
            onClick={() => setSource("auto")}
          >
            سیستمی / اتومات
          </Button>
          <Button
            type="button"
            size="sm"
            variant={sourceFilter === "manual" ? "default" : "outline"}
            onClick={() => setSource("manual")}
          >
            دستی
          </Button>
        </div>
        <Select
          className="w-auto min-w-[10rem]"
          value={
            ["sales", "purchase", "treasury", "payroll", "assets"].includes(sourceFilter)
              ? sourceFilter
              : ""
          }
          onChange={(e) => setSource(e.target.value)}
        >
          <option value="">ماژول خاص…</option>
          <option value="sales">فروش</option>
          <option value="purchase">خرید</option>
          <option value="treasury">خزانه</option>
          <option value="payroll">حقوق</option>
          <option value="assets">دارایی</option>
        </Select>
      </div>

      <DataTable
        columns={[
          {
            key: "voucher_number",
            header: "شماره",
            render: (r) => (
              <Link className="font-medium text-primary hover:underline" href={`/accounting/vouchers/${r.id}`}>
                {String(r.voucher_number)}
              </Link>
            ),
          },
          {
            key: "voucher_date",
            header: "تاریخ",
            render: (r) => <JalaliDateText value={String(r.voucher_date ?? "")} />,
          },
          {
            key: "source_module",
            header: "منبع",
            render: (r) => (
              <Badge tone={isAutoSource(r.source_module) ? "primary" : "default"}>
                {sourceLabel(r.source_module)}
              </Badge>
            ),
          },
          {
            key: "status",
            header: "وضعیت",
            render: (r) => (
              <Badge tone={r.status === "posted" ? "success" : r.status === "draft" ? "default" : "warning"}>
                {STATUS_FA[String(r.status)] ?? String(r.status)}
              </Badge>
            ),
          },
          { key: "total_debit", header: "بدهکار", render: (r) => formatMoney(String(r.total_debit)) },
          { key: "total_credit", header: "بستانکار", render: (r) => formatMoney(String(r.total_credit)) },
          {
            key: "description",
            header: "شرح",
            render: (r) => {
              const ref = r.reference_number ? String(r.reference_number) : "";
              const desc = r.description ? String(r.description) : "";
              if (desc && ref) return `${desc} (مرجع: ${ref})`;
              return desc || ref || "—";
            },
          },
        ]}
        rows={rows as unknown as Record<string, unknown>[]}
        empty={
          <EmptyState
            title={
              sourceFilter === "auto"
                ? "هنوز سند اتومات ثبت نشده — ثبت حسابداری فاکتور/رسید/خزانه یا روشن‌کردن اسناد اتوماتیک"
                : "سندی وجود ندارد"
            }
            action={
              <Link href="/accounting/vouchers/new">
                <Button>ایجاد سند دستی</Button>
              </Link>
            }
          />
        }
      />
      <Pagination
        page={page}
        pageSize={pageSize}
        total={
          (listQ.data?.length ?? 0) === pageSize
            ? page * pageSize + 1
            : (page - 1) * pageSize + Math.max(listQ.data?.length ?? 0, 1)
        }
        onPageChange={setPage}
      />
    </div>
  );
}

export default function VouchersPage() {
  return (
    <Suspense fallback={<LoadingState />}>
      <VouchersList />
    </Suspense>
  );
}
