"use client";

import { useQuery } from "@tanstack/react-query";
import {
  PageHeader,
  LoadingState,
  ErrorState,
  Badge,
  Card,
  CardContent,
  EmptyState,
} from "@/components/ds";
import { crmApi, CrmApiError } from "@/modules/crm/services/crm-api";
import { useTenantId } from "@/hooks/useTenantId";
import { CrmStatGrid } from "@/modules/crm/design-system";

export function CrmPageLoader({ label = "در حال بارگذاری…" }: { label?: string }) {
  return <LoadingState label={label} />;
}

export function CrmPageError({
  error,
  onRetry,
}: {
  error: unknown;
  onRetry?: () => void;
}) {
  if (error instanceof CrmApiError && error.status === 403) {
    return (
      <EmptyState
        title="دسترسی محدود"
        description={error.message || "مجوز لازم برای این عملیات وجود ندارد."}
      />
    );
  }
  const message = error instanceof Error ? error.message : "خطا در دریافت داده‌ها";
  return <ErrorState message={message} onRetry={onRetry} />;
}

export function useCrmHealth() {
  return useQuery({
    queryKey: ["crm", "health"],
    queryFn: () => crmApi.health(),
  });
}

export function CrmServiceBadge() {
  const healthQ = useCrmHealth();
  if (!healthQ.data) return null;
  return (
    <Badge tone={healthQ.data.status === "ok" ? "success" : "danger"}>
      CRM v{healthQ.data.version}
    </Badge>
  );
}

export function useCrmCounts(tenantId: string | null) {
  return useQuery({
    queryKey: ["crm", tenantId, "counts"],
    queryFn: async () => {
      const [leads, contacts, orgs, opps, activities, tasks, meetings, calls] =
        await Promise.all([
          crmApi.leads.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.contacts.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.organizations.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.opportunities.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.activities.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.tasks.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.meetings.list(tenantId!, { page: 1, page_size: 500 }),
          crmApi.calls.list(tenantId!, { page: 1, page_size: 500 }),
        ]);
      return {
        leads: leads.length,
        contacts: contacts.length,
        organizations: orgs.length,
        opportunities: opps.length,
        activities: activities.length,
        tasks: tasks.length,
        meetings: meetings.length,
        calls: calls.length,
        openDeals: opps.filter((o) => o.status === "open").length,
        wonDeals: opps.filter((o) => o.status === "won").length,
      };
    },
    enabled: !!tenantId,
  });
}

export function CrmCountsGrid({ tenantId }: { tenantId: string }) {
  const q = useCrmCounts(tenantId);
  if (q.isLoading) return <CrmPageLoader />;
  if (q.error) return <CrmPageError error={q.error} onRetry={() => q.refetch()} />;
  const c = q.data!;
  return (
    <CrmStatGrid
      stats={[
        { label: "سرنخ‌ها", value: c.leads },
        { label: "مخاطبین", value: c.contacts },
        { label: "شرکت‌ها", value: c.organizations },
        { label: "معاملات باز", value: c.openDeals },
        { label: "معاملات برنده", value: c.wonDeals },
        { label: "فعالیت‌ها", value: c.activities },
        { label: "وظایف", value: c.tasks },
        { label: "جلسات", value: c.meetings },
      ]}
    />
  );
}

export function exportToCsv(filename: string, rows: Record<string, unknown>[], columns: string[]) {
  const header = columns.join(",");
  const lines = rows.map((r) =>
    columns.map((c) => JSON.stringify(r[c] ?? "")).join(",")
  );
  const blob = new Blob(["\uFEFF" + [header, ...lines].join("\n")], {
    type: "text/csv;charset=utf-8;",
  });
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url;
  a.download = filename;
  a.click();
  URL.revokeObjectURL(url);
}