import { useEffect, useState } from "react";
import { Link, useSearchParams } from "react-router-dom";

import {
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
} from "@/components/ui/breadcrumb";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { apiGet } from "@/lib/api";
import type { Booking } from "@/lib/types";
import { formatDate, formatMoney } from "@/lib/format";
import { roomDisplayName } from "@/lib/room-utils";

export function BookingsPage() {
  const [searchParams] = useSearchParams();
  const ref = searchParams.get("referral") ?? "";
  const [list, setList] = useState<Booking[]>([]);
  const [status, setStatus] = useState<string>("all");
  const [q, setQ] = useState("");

  useEffect(() => {
    const params = new URLSearchParams();
    if (status !== "all") params.set("status", status);
    if (q) params.set("q", q);
    if (ref) params.set("referralCode", ref);
    const t = setTimeout(() => {
      apiGet<{ data: Booking[] }>(`/bookings?${params}`)
        .then((r) => setList(r.data))
        .catch(console.error);
    }, 200);
    return () => clearTimeout(t);
  }, [status, q, ref]);

  return (
    <div className="space-y-6">
      <Breadcrumb>
        <BreadcrumbList>
          <BreadcrumbItem>
            <BreadcrumbLink href="/dashboard">Home</BreadcrumbLink>
          </BreadcrumbItem>
          <BreadcrumbSeparator />
          <BreadcrumbItem>
            <BreadcrumbPage>Bookings</BreadcrumbPage>
          </BreadcrumbItem>
        </BreadcrumbList>
      </Breadcrumb>
      <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
        <div>
          <h1 className="text-2xl font-bold">Bookings</h1>
          <p className="text-muted-foreground text-sm">
            Search, filter, export
          </p>
        </div>
        <div className="flex flex-wrap gap-2">
          <Button asChild>
            <Link to="/bookings/new">+ New booking</Link>
          </Button>
          <Button variant="outline" asChild>
            <a href="/api/export/bookings.csv" download>
              Export CSV
            </a>
          </Button>
        </div>
      </div>

      <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-4">
        {["Total", "Confirmed", "Held", "Pending"].map((label, i) => (
          <Card key={label} className="rounded-2xl">
            <CardHeader className="pb-2">
              <CardTitle className="text-sm font-medium text-muted-foreground">
                {label}
              </CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-2xl font-bold">
                {i === 0
                  ? list.length
                  : list.filter((b) =>
                      label === "Confirmed"
                        ? b.status === "confirmed"
                        : label === "Held"
                          ? b.status === "held"
                          : b.status === "payment_pending"
                    ).length}
              </p>
            </CardContent>
          </Card>
        ))}
      </div>

      <Card className="rounded-2xl">
        <CardContent className="pt-6">
          <div className="mb-4 flex flex-col gap-3 sm:flex-row">
            <Input
              placeholder="Search guest, ref…"
              value={q}
              onChange={(e) => setQ(e.target.value)}
              className="max-w-md"
            />
            <Select value={status} onValueChange={setStatus}>
              <SelectTrigger className="w-full sm:w-44">
                <SelectValue placeholder="Status" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All status</SelectItem>
                <SelectItem value="confirmed">Confirmed</SelectItem>
                <SelectItem value="held">Held</SelectItem>
                <SelectItem value="payment_pending">Payment pending</SelectItem>
                <SelectItem value="cancelled">Cancelled</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="hidden md:block overflow-x-auto">
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead>Guest</TableHead>
                  <TableHead>Room</TableHead>
                  <TableHead>Dates</TableHead>
                  <TableHead>Status</TableHead>
                  <TableHead className="text-right">Total</TableHead>
                  <TableHead />
                </TableRow>
              </TableHeader>
              <TableBody>
                {list.map((b) => (
                  <TableRow key={b.id}>
                    <TableCell>
                      <p className="font-medium">
                        {b.guest.firstName} {b.guest.lastName}
                      </p>
                      <p className="text-xs text-muted-foreground">
                        {b.guest.email}
                      </p>
                    </TableCell>
                    <TableCell className="text-sm">
                      {roomDisplayName(b.roomId)}
                    </TableCell>
                    <TableCell className="text-xs text-muted-foreground">
                      {formatDate(b.checkIn)} → {formatDate(b.checkOut)}
                    </TableCell>
                    <TableCell>
                      <Badge variant="secondary">{b.status}</Badge>
                    </TableCell>
                    <TableCell className="text-right font-medium">
                      {formatMoney(b.pricing.total)}
                    </TableCell>
                    <TableCell>
                      <Button variant="outline" size="sm" asChild>
                        <Link to={`/bookings/${b.id}`}>Details</Link>
                      </Button>
                    </TableCell>
                  </TableRow>
                ))}
              </TableBody>
            </Table>
          </div>
          <div className="space-y-3 md:hidden">
            {list.map((b) => (
              <Link
                key={b.id}
                to={`/bookings/${b.id}`}
                className="block rounded-xl border p-4"
              >
                <p className="font-medium">
                  {b.guest.firstName} {b.guest.lastName}
                </p>
                <p className="text-xs text-muted-foreground">
                  {formatDate(b.checkIn)} · {b.status}
                </p>
                <p className="mt-2 font-semibold">
                  {formatMoney(b.pricing.total)}
                </p>
              </Link>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
}