import { createFileRoute, Link, useNavigate } from "@tanstack/react-router";
import { useEffect, useMemo, useState } from "react";
import { ProtectedLayout } from "@/components/protected-layout";
import { PageContainer, PageHeader } from "@/components/app-shell";
import { Card, CardContent } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { supabase } from "@/integrations/supabase/client";
import { Receipt, Search, FilePlus, Clock, DollarSign, CheckCircle2, Undo2, Trash2, Send, Ban } from "lucide-react";
import { formatCurrency, formatDate, statusBadgeClass } from "@/lib/format";
import { ensureMarkedInvoicedPlaceholder } from "@/lib/invoice-generation";
import { useAuth } from "@/lib/auth";
import { toast } from "sonner";

export const Route = createFileRoute("/invoices/")({
  component: () => (
    <ProtectedLayout>
      <InvoicesIndex />
    </ProtectedLayout>
  ),
});

type UnbilledStatus = "unbilled" | "marked" | "all";

const PAGE_SIZE = 100;

function InvoicesIndex() {
  const navigate = useNavigate();
  const { user } = useAuth();
  const [invoices, setInvoices] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [q, setQ] = useState("");
  const [status, setStatus] = useState<string>("all");
  const [page, setPage] = useState(0);
  const [totalCount, setTotalCount] = useState(0);

  const [time, setTime] = useState<any[]>([]);
  const [expenses, setExpenses] = useState<any[]>([]);
  const [tabsLoaded, setTabsLoaded] = useState(false);
  const [timeFilter, setTimeFilter] = useState<UnbilledStatus>("unbilled");
  const [expFilter, setExpFilter] = useState<UnbilledStatus>("unbilled");
  const [selectedTime, setSelectedTime] = useState<Set<string>>(new Set());
  const [selectedExp, setSelectedExp] = useState<Set<string>>(new Set());
  const [selectedInvoices, setSelectedInvoices] = useState<Set<string>>(new Set());
  const [working, setWorking] = useState(false);

  // Map of placeholder invoice id -> true (placeholder = MARKED-INVOICED-* or IMPORT-PREBILLED-*)
  const [placeholderIds, setPlaceholderIds] = useState<Set<string>>(new Set());

  const fetchInvoices = async () => {
    setLoading(true);
    let query = supabase
      .from("invoices")
      .select("*, client:clients(id, name), case:cases(id, case_number, title)", { count: "exact" })
      .order("issue_date", { ascending: false, nullsFirst: false })
      .order("created_at", { ascending: false });

    if (status !== "all") query = query.eq("status", status as any);
    if (q.trim()) {
      const s = q.trim().replace(/[%,]/g, " ");
      query = query.or(`invoice_number.ilike.%${s}%`);
    }

    const from = page * PAGE_SIZE;
    const to = from + PAGE_SIZE - 1;
    const { data, count } = await query.range(from, to);

    setInvoices(data ?? []);
    setTotalCount(count ?? 0);
    setLoading(false);

    const placeholders = new Set<string>(
      (data ?? [])
        .filter((i: any) =>
          typeof i.invoice_number === "string" &&
          (i.invoice_number.startsWith("MARKED-INVOICED-") || i.invoice_number.startsWith("IMPORT-PREBILLED-"))
        )
        .map((i: any) => i.id),
    );
    setPlaceholderIds(placeholders);
  };

  useEffect(() => { fetchInvoices(); /* eslint-disable-next-line react-hooks/exhaustive-deps */ }, [page, status]);

  // Debounce search
  useEffect(() => {
    const t = setTimeout(() => { setPage(0); fetchInvoices(); }, 300);
    return () => clearTimeout(t);
    /* eslint-disable-next-line react-hooks/exhaustive-deps */
  }, [q]);

  const loadUnbilled = async () => {
    const [{ data: t }, { data: e }] = await Promise.all([
      supabase
        .from("time_entries")
        .select("id, work_date, description, hours, hourly_rate, billable, user_id, invoice_id, case_id, case:cases(id, case_number, title, client_id, client:clients(id, name)), profile:profiles!time_entries_user_id_fkey(id, full_name, email)")
        .eq("billable", true)
        .order("work_date", { ascending: false })
        .limit(2000),
      supabase
        .from("expenses")
        .select("id, expense_date, description, amount, billable, user_id, invoice_id, case_id, case:cases(id, case_number, title, client_id, client:clients(id, name)), profile:profiles!expenses_user_id_fkey(id, full_name, email)")
        .eq("billable", true)
        .order("expense_date", { ascending: false })
        .limit(2000),
    ]);
    setTime(t ?? []);
    setExpenses(e ?? []);
    setTabsLoaded(true);
  };

  useEffect(() => { loadUnbilled(); }, []);

  const filtered = invoices;

  const totals = useMemo(() => {
    const outstanding = filtered.reduce((s, i) => s + (Number(i.total) - Number(i.amount_paid)), 0);
    const paid = filtered.reduce((s, i) => s + Number(i.amount_paid), 0);
    return { outstanding, paid, count: totalCount };
  }, [filtered, totalCount]);

  const totalPages = Math.max(1, Math.ceil(totalCount / PAGE_SIZE));

  // Classify each row: unbilled (no invoice_id), marked (linked to placeholder), real (linked to real invoice — not shown)
  const isPlaceholder = (invId: string | null) => !!invId && placeholderIds.has(invId);
  const rowStatus = (invId: string | null): UnbilledStatus =>
    !invId ? "unbilled" : isPlaceholder(invId) ? "marked" : "all"; // "all" sentinel for real-invoice rows we hide

  const visibleTime = useMemo(() => {
    return time.filter((t) => {
      const s = rowStatus(t.invoice_id);
      if (s === "all" /* real invoice */) return false;
      if (timeFilter === "all") return true;
      return s === timeFilter;
    });
  }, [time, timeFilter, placeholderIds]);

  const visibleExp = useMemo(() => {
    return expenses.filter((e) => {
      const s = rowStatus(e.invoice_id);
      if (s === "all") return false;
      if (expFilter === "all") return true;
      return s === expFilter;
    });
  }, [expenses, expFilter, placeholderIds]);

  const visibleTimeTotal = useMemo(
    () => visibleTime.reduce((s, t) => s + Number(t.hours) * Number(t.hourly_rate), 0),
    [visibleTime],
  );
  const visibleExpTotal = useMemo(
    () => visibleExp.reduce((s, e) => s + Number(e.amount), 0),
    [visibleExp],
  );

  const toggleSel = (set: Set<string>, id: string) => {
    const next = new Set(set);
    if (next.has(id)) next.delete(id); else next.add(id);
    return next;
  };

  const bulkUpdate = async (
    table: "time_entries" | "expenses",
    rows: any[],
    ids: Set<string>,
    markInvoiced: boolean,
  ) => {
    if (!user?.id) { toast.error("Not signed in"); return; }
    if (ids.size === 0) { toast.error("Select at least one item"); return; }
    setWorking(true);
    try {
      if (markInvoiced) {
        // Group by client_id; create/find placeholder per client.
        const byClient = new Map<string, { caseId: string; rowIds: string[] }>();
        const skipped: string[] = [];
        for (const r of rows) {
          if (!ids.has(r.id)) continue;
          const cid = r.case?.client_id ?? r.case?.client?.id ?? null;
          if (!cid || !r.case_id) { skipped.push(r.id); continue; }
          const slot = byClient.get(cid);
          if (slot) slot.rowIds.push(r.id);
          else byClient.set(cid, { caseId: r.case_id, rowIds: [r.id] });
        }
        for (const [cid, slot] of byClient) {
          const invId = await ensureMarkedInvoicedPlaceholder(cid, slot.caseId, user.id);
          const { error } = await supabase.from(table).update({ invoice_id: invId }).in("id", slot.rowIds);
          if (error) throw error;
        }
        if (skipped.length) toast.warning(`${skipped.length} item(s) skipped — missing client/case`);
        toast.success(`Marked ${ids.size - skipped.length} item(s) as invoiced`);
      } else {
        const idArr = Array.from(ids);
        const { error } = await supabase.from(table).update({ invoice_id: null }).in("id", idArr);
        if (error) throw error;
        toast.success(`Marked ${idArr.length} item(s) as unbilled`);
      }
      // Refetch invoices to refresh placeholder set + unbilled lists
      await fetchInvoices();
      await loadUnbilled();
      if (table === "time_entries") setSelectedTime(new Set()); else setSelectedExp(new Set());
    } catch (err: any) {
      toast.error(err?.message ?? "Bulk update failed");
    } finally {
      setWorking(false);
    }
  };

  const refreshInvoices = async () => {
    await fetchInvoices();
  };

  const bulkInvoiceAction = async (action: "delete" | "sent" | "void") => {
    if (selectedInvoices.size === 0) { toast.error("Select at least one invoice"); return; }
    const ids = Array.from(selectedInvoices);
    const verb = action === "delete" ? "delete" : `mark as ${action}`;
    if (!confirm(`${verb.charAt(0).toUpperCase() + verb.slice(1)} ${ids.length} invoice(s)?`)) return;
    setWorking(true);
    try {
      if (action === "delete") {
        const { error } = await supabase.from("invoices").delete().in("id", ids);
        if (error) throw error;
        toast.success(`Deleted ${ids.length} invoice(s)`);
      } else {
        const { error } = await supabase.from("invoices").update({ status: action }).in("id", ids);
        if (error) throw error;
        toast.success(`Marked ${ids.length} invoice(s) as ${action}`);
      }
      setSelectedInvoices(new Set());
      await refreshInvoices();
    } catch (err: any) {
      toast.error(err?.message ?? "Bulk action failed");
    } finally {
      setWorking(false);
    }
  };

  return (
    <PageContainer>
      <PageHeader
        title="Invoices"
        description="All client invoices across the firm"
        actions={
          <Button onClick={() => navigate({ to: "/invoices/new" })}>
            <FilePlus className="h-4 w-4 mr-2" /> New invoice
          </Button>
        }
      />

      <div className="grid sm:grid-cols-3 gap-3 mb-5">
        <Stat label="Invoices" value={totals.count.toString()} />
        <Stat label="Outstanding A/R" value={formatCurrency(totals.outstanding)} />
        <Stat label="Collected" value={formatCurrency(totals.paid)} />
      </div>

      <Tabs defaultValue="invoices">
        <TabsList>
          <TabsTrigger value="invoices">
            <Receipt className="h-4 w-4 mr-1.5" /> Invoices
          </TabsTrigger>
          <TabsTrigger value="time">
            <Clock className="h-4 w-4 mr-1.5" /> Time
          </TabsTrigger>
          <TabsTrigger value="expenses">
            <DollarSign className="h-4 w-4 mr-1.5" /> Expenses
          </TabsTrigger>
        </TabsList>

        <TabsContent value="invoices" className="mt-4">
          <div className="flex flex-col sm:flex-row gap-2 mb-4">
            <div className="relative flex-1">
              <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
              <Input className="pl-9" placeholder="Search by invoice #, client, case…" value={q} onChange={(e) => setQ(e.target.value)} />
            </div>
            <Select value={status} onValueChange={(v) => { setPage(0); setStatus(v); }}>
              <SelectTrigger className="w-[180px]"><SelectValue /></SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All statuses</SelectItem>
                <SelectItem value="draft">Draft</SelectItem>
                <SelectItem value="sent">Sent</SelectItem>
                <SelectItem value="paid">Paid</SelectItem>
                <SelectItem value="overdue">Overdue</SelectItem>
                <SelectItem value="void">Void</SelectItem>
              </SelectContent>
            </Select>
          </div>

          <Card className="border-border/60 overflow-hidden">
            <CardContent className="p-0">
              {selectedInvoices.size > 0 && (
                <div className="flex items-center justify-between gap-2 px-4 py-2 bg-muted/40 border-b">
                  <span className="text-xs text-muted-foreground">{selectedInvoices.size} selected</span>
                  <div className="flex items-center gap-2">
                    <Button variant="outline" size="sm" disabled={working} onClick={() => bulkInvoiceAction("sent")}>
                      <Send className="h-3.5 w-3.5 mr-1.5" /> Mark sent
                    </Button>
                    <Button variant="outline" size="sm" disabled={working} onClick={() => bulkInvoiceAction("void")}>
                      <Ban className="h-3.5 w-3.5 mr-1.5" /> Mark void
                    </Button>
                    <Button variant="outline" size="sm" disabled={working} onClick={() => bulkInvoiceAction("delete")} className="text-destructive hover:text-destructive">
                      <Trash2 className="h-3.5 w-3.5 mr-1.5" /> Delete
                    </Button>
                    <Button variant="ghost" size="sm" onClick={() => setSelectedInvoices(new Set())}>Clear</Button>
                  </div>
                </div>
              )}
              <table className="w-full text-sm">
                <thead className="bg-muted/50 text-xs uppercase tracking-wider text-muted-foreground">
                  <tr>
                    <th className="px-3 py-3 w-9">
                      <Checkbox
                        checked={filtered.length > 0 && selectedInvoices.size === filtered.length}
                        onCheckedChange={(c) => setSelectedInvoices(c ? new Set(filtered.map((i) => i.id)) : new Set())}
                      />
                    </th>
                    <th className="text-left px-4 py-3 font-medium">Invoice #</th>
                    <th className="text-left px-4 py-3 font-medium">Client</th>
                    <th className="text-left px-4 py-3 font-medium">Issued</th>
                    <th className="text-left px-4 py-3 font-medium">Due</th>
                    <th className="text-left px-4 py-3 font-medium">Status</th>
                    <th className="text-right px-4 py-3 font-medium">Total</th>
                    <th className="text-right px-4 py-3 font-medium">Balance</th>
                  </tr>
                </thead>
                <tbody>
                  {loading && <tr><td colSpan={8} className="text-center py-12 text-muted-foreground">Loading…</td></tr>}
                  {!loading && filtered.length === 0 && (
                    <tr><td colSpan={8} className="text-center py-12 text-muted-foreground">
                      <Receipt className="h-8 w-8 mx-auto mb-2 opacity-40" />
                      No invoices yet. Click <strong>New invoice</strong> to generate one.
                    </td></tr>
                  )}
                  {filtered.map((i) => {
                    const balance = Number(i.total) - Number(i.amount_paid);
                    return (
                      <tr key={i.id} className="border-t hover:bg-muted/30">
                        <td className="px-3 py-3" onClick={(e) => e.stopPropagation()}>
                          <Checkbox
                            checked={selectedInvoices.has(i.id)}
                            onCheckedChange={() => setSelectedInvoices((s) => toggleSel(s, i.id))}
                          />
                        </td>
                        <td className="px-4 py-3">
                          <Link to="/invoices/$invoiceId" params={{ invoiceId: i.id }} className="font-medium hover:text-primary">
                            {i.invoice_number}
                          </Link>
                        </td>
                        <td className="px-4 py-3">
                          {i.client ? (
                            <Link to="/clients/$clientId" params={{ clientId: i.client.id }} className="hover:text-primary">
                              {i.client.name}
                            </Link>
                          ) : "—"}
                        </td>
                        <td className="px-4 py-3 text-muted-foreground">{formatDate(i.issue_date)}</td>
                        <td className="px-4 py-3 text-muted-foreground">{formatDate(i.due_date)}</td>
                        <td className="px-4 py-3"><Badge variant="outline" className={statusBadgeClass(i.status)}>{i.status}</Badge></td>
                        <td className="px-4 py-3 text-right tabular-nums">{formatCurrency(i.total)}</td>
                        <td className="px-4 py-3 text-right tabular-nums font-medium">{formatCurrency(balance)}</td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </CardContent>
          </Card>
          {totalCount > PAGE_SIZE && (
            <div className="flex items-center justify-between mt-3 text-sm">
              <span className="text-muted-foreground">
                Showing {totalCount === 0 ? 0 : page * PAGE_SIZE + 1}–{Math.min((page + 1) * PAGE_SIZE, totalCount)} of {totalCount}
              </span>
              <div className="flex items-center gap-2">
                <Button variant="outline" size="sm" disabled={page === 0 || loading} onClick={() => setPage((p) => Math.max(0, p - 1))}>
                  Previous
                </Button>
                <span className="text-muted-foreground">Page {page + 1} of {totalPages}</span>
                <Button variant="outline" size="sm" disabled={page + 1 >= totalPages || loading} onClick={() => setPage((p) => p + 1)}>
                  Next
                </Button>
              </div>
            </div>
          )}
        </TabsContent>

        <TabsContent value="time" className="mt-4">
          <UnbilledToolbar
            label="time entries"
            filter={timeFilter}
            setFilter={setTimeFilter}
            count={visibleTime.length}
            total={visibleTimeTotal}
            selectedCount={selectedTime.size}
            working={working}
            onMarkInvoiced={() => bulkUpdate("time_entries", visibleTime, selectedTime, true)}
            onMarkUnbilled={() => bulkUpdate("time_entries", visibleTime, selectedTime, false)}
            onClearSel={() => setSelectedTime(new Set())}
          />
          <Card className="border-border/60 overflow-hidden">
            <CardContent className="p-0">
              <table className="w-full text-sm">
                <thead className="bg-muted/50 text-xs uppercase tracking-wider text-muted-foreground">
                  <tr>
                    <th className="px-3 py-3 w-9">
                      <Checkbox
                        checked={visibleTime.length > 0 && selectedTime.size === visibleTime.length}
                        onCheckedChange={(c) => setSelectedTime(c ? new Set(visibleTime.map((t) => t.id)) : new Set())}
                      />
                    </th>
                    <th className="text-left px-4 py-3 font-medium">Date</th>
                    <th className="text-left px-4 py-3 font-medium">Client / Case</th>
                    <th className="text-left px-4 py-3 font-medium">Description</th>
                    <th className="text-left px-4 py-3 font-medium">User</th>
                    <th className="text-right px-4 py-3 font-medium">Hours</th>
                    <th className="text-right px-4 py-3 font-medium">Rate</th>
                    <th className="text-right px-4 py-3 font-medium">Amount</th>
                    <th className="text-left px-4 py-3 font-medium">Status</th>
                  </tr>
                </thead>
                <tbody>
                  {!tabsLoaded && <tr><td colSpan={9} className="text-center py-12 text-muted-foreground">Loading…</td></tr>}
                  {tabsLoaded && visibleTime.length === 0 && (
                    <tr><td colSpan={9} className="text-center py-12 text-muted-foreground">
                      <Clock className="h-8 w-8 mx-auto mb-2 opacity-40" />
                      No matching time entries.
                    </td></tr>
                  )}
                  {visibleTime.map((t) => {
                    const amount = Number(t.hours) * Number(t.hourly_rate);
                    const marked = isPlaceholder(t.invoice_id);
                    return (
                      <tr key={t.id} className="border-t hover:bg-muted/30">
                        <td className="px-3 py-3">
                          <Checkbox
                            checked={selectedTime.has(t.id)}
                            onCheckedChange={() => setSelectedTime((s) => toggleSel(s, t.id))}
                          />
                        </td>
                        <td className="px-4 py-3 text-muted-foreground whitespace-nowrap">{formatDate(t.work_date)}</td>
                        <td className="px-4 py-3">
                          {t.case ? (
                            <div className="min-w-0">
                              {t.case.client && (
                                <Link to="/clients/$clientId" params={{ clientId: t.case.client.id }} className="text-xs text-muted-foreground hover:text-primary block truncate">
                                  {t.case.client.name}
                                </Link>
                              )}
                              <Link to="/cases/$caseId" params={{ caseId: t.case.id }} className="hover:text-primary truncate block">
                                {t.case.case_number} · {t.case.title}
                              </Link>
                            </div>
                          ) : "—"}
                        </td>
                        <td className="px-4 py-3 text-muted-foreground max-w-md truncate">{t.description}</td>
                        <td className="px-4 py-3 text-muted-foreground text-xs">{t.profile?.full_name || t.profile?.email || "—"}</td>
                        <td className="px-4 py-3 text-right tabular-nums">{Number(t.hours).toFixed(2)}</td>
                        <td className="px-4 py-3 text-right tabular-nums text-muted-foreground">{formatCurrency(t.hourly_rate)}</td>
                        <td className="px-4 py-3 text-right tabular-nums font-medium">{formatCurrency(amount)}</td>
                        <td className="px-4 py-3 text-xs">
                          {marked ? (
                            <Badge variant="outline" className="text-muted-foreground">Marked invoiced</Badge>
                          ) : (
                            <Badge variant="outline">Unbilled</Badge>
                          )}
                        </td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </CardContent>
          </Card>
        </TabsContent>

        <TabsContent value="expenses" className="mt-4">
          <UnbilledToolbar
            label="expenses"
            filter={expFilter}
            setFilter={setExpFilter}
            count={visibleExp.length}
            total={visibleExpTotal}
            selectedCount={selectedExp.size}
            working={working}
            onMarkInvoiced={() => bulkUpdate("expenses", visibleExp, selectedExp, true)}
            onMarkUnbilled={() => bulkUpdate("expenses", visibleExp, selectedExp, false)}
            onClearSel={() => setSelectedExp(new Set())}
          />
          <Card className="border-border/60 overflow-hidden">
            <CardContent className="p-0">
              <table className="w-full text-sm">
                <thead className="bg-muted/50 text-xs uppercase tracking-wider text-muted-foreground">
                  <tr>
                    <th className="px-3 py-3 w-9">
                      <Checkbox
                        checked={visibleExp.length > 0 && selectedExp.size === visibleExp.length}
                        onCheckedChange={(c) => setSelectedExp(c ? new Set(visibleExp.map((e) => e.id)) : new Set())}
                      />
                    </th>
                    <th className="text-left px-4 py-3 font-medium">Date</th>
                    <th className="text-left px-4 py-3 font-medium">Client / Case</th>
                    <th className="text-left px-4 py-3 font-medium">Description</th>
                    <th className="text-left px-4 py-3 font-medium">User</th>
                    <th className="text-right px-4 py-3 font-medium">Amount</th>
                    <th className="text-left px-4 py-3 font-medium">Status</th>
                  </tr>
                </thead>
                <tbody>
                  {!tabsLoaded && <tr><td colSpan={7} className="text-center py-12 text-muted-foreground">Loading…</td></tr>}
                  {tabsLoaded && visibleExp.length === 0 && (
                    <tr><td colSpan={7} className="text-center py-12 text-muted-foreground">
                      <DollarSign className="h-8 w-8 mx-auto mb-2 opacity-40" />
                      No matching expenses.
                    </td></tr>
                  )}
                  {visibleExp.map((e) => {
                    const marked = isPlaceholder(e.invoice_id);
                    return (
                      <tr key={e.id} className="border-t hover:bg-muted/30">
                        <td className="px-3 py-3">
                          <Checkbox
                            checked={selectedExp.has(e.id)}
                            onCheckedChange={() => setSelectedExp((s) => toggleSel(s, e.id))}
                          />
                        </td>
                        <td className="px-4 py-3 text-muted-foreground whitespace-nowrap">{formatDate(e.expense_date)}</td>
                        <td className="px-4 py-3">
                          {e.case ? (
                            <div className="min-w-0">
                              {e.case.client && (
                                <Link to="/clients/$clientId" params={{ clientId: e.case.client.id }} className="text-xs text-muted-foreground hover:text-primary block truncate">
                                  {e.case.client.name}
                                </Link>
                              )}
                              <Link to="/cases/$caseId" params={{ caseId: e.case.id }} className="hover:text-primary truncate block">
                                {e.case.case_number} · {e.case.title}
                              </Link>
                            </div>
                          ) : "—"}
                        </td>
                        <td className="px-4 py-3 text-muted-foreground max-w-md truncate">{e.description}</td>
                        <td className="px-4 py-3 text-muted-foreground text-xs">{e.profile?.full_name || e.profile?.email || "—"}</td>
                        <td className="px-4 py-3 text-right tabular-nums font-medium">{formatCurrency(e.amount)}</td>
                        <td className="px-4 py-3 text-xs">
                          {marked ? (
                            <Badge variant="outline" className="text-muted-foreground">Marked invoiced</Badge>
                          ) : (
                            <Badge variant="outline">Unbilled</Badge>
                          )}
                        </td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </CardContent>
          </Card>
        </TabsContent>
      </Tabs>
    </PageContainer>
  );
}

function UnbilledToolbar({
  label,
  filter,
  setFilter,
  count,
  total,
  selectedCount,
  working,
  onMarkInvoiced,
  onMarkUnbilled,
  onClearSel,
}: {
  label: string;
  filter: UnbilledStatus;
  setFilter: (v: UnbilledStatus) => void;
  count: number;
  total: number;
  selectedCount: number;
  working: boolean;
  onMarkInvoiced: () => void;
  onMarkUnbilled: () => void;
  onClearSel: () => void;
}) {
  return (
    <div className="flex flex-wrap items-center justify-between gap-2 mb-3">
      <div className="flex items-center gap-3">
        <Select value={filter} onValueChange={(v) => setFilter(v as UnbilledStatus)}>
          <SelectTrigger className="w-[200px]"><SelectValue /></SelectTrigger>
          <SelectContent>
            <SelectItem value="unbilled">Unbilled only</SelectItem>
            <SelectItem value="marked">Marked invoiced</SelectItem>
            <SelectItem value="all">All (unbilled + marked)</SelectItem>
          </SelectContent>
        </Select>
        <div className="text-sm text-muted-foreground">{count} {label}</div>
      </div>
      <div className="flex items-center gap-2">
        {selectedCount > 0 && (
          <>
            <span className="text-xs text-muted-foreground">{selectedCount} selected</span>
            <Button variant="outline" size="sm" disabled={working} onClick={onMarkInvoiced}>
              <CheckCircle2 className="h-3.5 w-3.5 mr-1.5" /> Mark invoiced
            </Button>
            <Button variant="outline" size="sm" disabled={working} onClick={onMarkUnbilled}>
              <Undo2 className="h-3.5 w-3.5 mr-1.5" /> Mark unbilled
            </Button>
            <Button variant="ghost" size="sm" onClick={onClearSel}>Clear</Button>
          </>
        )}
        <div className="font-serif text-xl tabular-nums ml-3">{formatCurrency(total)}</div>
      </div>
    </div>
  );
}

function Stat({ label, value }: { label: string; value: string }) {
  return (
    <Card className="border-border/60">
      <CardContent className="p-4">
        <div className="text-[10px] uppercase tracking-wider text-muted-foreground">{label}</div>
        <div className="font-serif text-2xl mt-1">{value}</div>
      </CardContent>
    </Card>
  );
}