"use client";

import { searchItems } from "@/lib/search";

import Image from "next/image";
import Link from "next/link";
import { useSearchParams } from "next/navigation";
import { SearchIcon, UsersIcon } from "lucide-react";
import { useMemo } from "react";

import {
  Card,
  CardAction,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import {
  Empty,
  EmptyDescription,
  EmptyHeader,
  EmptyTitle,
} from "@/components/ui/empty";
import {
  InputGroup,
  InputGroupAddon,
  InputGroupInput,
} from "@/components/ui/input-group";
import { useVisitorPresence } from "@/hooks/use-presence";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";

type GuideCard = {
  id: string;
  slug: string;
  name: string;
  overview: string;
  coverUrl: string;
  version: number;
  aliases: string[];
  element: string | null;
  weaponType: string | null;
  rarity: number | null;
  updatedAt: Date;
  publishedAt: Date | null;
  publishedCatalogVersion: string | null;
};

const elementLabels: Record<string, string> = {
  Pyro: "ไฟ",
  Hydro: "น้ำ",
  Anemo: "ลม",
  Electro: "ไฟฟ้า",
  Dendro: "ไม้",
  Cryo: "น้ำแข็ง",
  Geo: "หิน",
};

const weaponTypeLabels: Record<string, string> = {
  WEAPON_SWORD_ONE_HAND: "ดาบ",
  WEAPON_CLAYMORE: "ดาบใหญ่",
  WEAPON_POLE: "หอก",
  WEAPON_BOW: "ธนู",
  WEAPON_CATALYST: "สื่อเวท",
};

export function StructuredDirectory({ guides }: { guides: GuideCard[] }) {
  const searchParams = useSearchParams();
  const query = searchParams.get("q") ?? "";
  const presence = useVisitorPresence(null);
  const elements = useMemo(() => [...new Set(guides.flatMap((guide) => guide.element ? [guide.element] : []))].sort(), [guides]);
  const weapons = useMemo(() => [...new Set(guides.flatMap((guide) => guide.weaponType ? [guide.weaponType] : []))].sort(), [guides]);
  const rarities = useMemo(() => [...new Set(guides.flatMap((guide) => guide.rarity ? [guide.rarity] : []))].sort((a, b) => b - a), [guides]);
  const elementParam = searchParams.get("element");
  const weaponParam = searchParams.get("weapon");
  const rarityParam = searchParams.get("rarity");
  const element = elementParam && elements.includes(elementParam) ? elementParam : "all";
  const weapon = weaponParam && weapons.includes(weaponParam) ? weaponParam : "all";
  const rarity = rarityParam && rarities.includes(Number(rarityParam)) ? rarityParam : "all";
  const sort = searchParams.get("sort") === "recent" ? "recent" : "manual";
  const matchingGuides = guides.filter((guide) =>
    (element === "all" || guide.element === element) &&
    (weapon === "all" || guide.weaponType === weapon) &&
    (rarity === "all" || guide.rarity === Number(rarity)),
  );
  const search = searchItems(matchingGuides, query,
    (guide) => `${guide.name} ${guide.overview} ${guide.aliases.join(" ")}`,
    (guide) => [guide.name, ...guide.aliases]);
  const filtered = sort === "recent"
    ? [...search.items].sort((left, right) =>
        new Date(right.publishedAt ?? right.updatedAt).getTime() - new Date(left.publishedAt ?? left.updatedAt).getTime())
    : search.items;

  function setParam(name: string, value: string) {
    const next = new URLSearchParams(searchParams.toString());
    if (!value || value === "all" || (name === "sort" && value === "manual")) next.delete(name);
    else next.set(name, value);
    const suffix = next.toString();
    window.history.replaceState(null, "", suffix ? `?${suffix}` : window.location.pathname);
  }
  return (
    <div className="flex flex-col gap-8">
      <div className="flex flex-wrap items-center gap-2">
        <InputGroup className="h-11 min-w-64 flex-1">
          <InputGroupAddon>
            <SearchIcon />
          </InputGroupAddon>
          <InputGroupInput
            value={query}
            onChange={(event) => setParam("q", event.target.value)}
            placeholder="ค้นหาไกด์…"
            aria-label="ค้นหาไกด์"
          />
        </InputGroup>
        <div className="flex flex-wrap gap-2" aria-label="ตัวกรองไกด์">
          <GuideFilter label="ธาตุ" value={element} options={elements} optionLabels={elementLabels} onChange={(value) => setParam("element", value)} />
          <GuideFilter label="อาวุธ" value={weapon} options={weapons} optionLabels={weaponTypeLabels} onChange={(value) => setParam("weapon", value)} />
          <GuideFilter label="ดาว" value={rarity} options={rarities.map(String)} onChange={(value) => setParam("rarity", value)} />
          <GuideFilter label="เรียงตาม" value={sort} options={["manual", "recent"]} optionLabels={{ manual: "แนะนำ", recent: "อัปเดตล่าสุด" }} includeAll={false} onChange={(value) => setParam("sort", value)} />
        </div>
      </div>

      {filtered.length ? (
        <div className="grid gap-5 sm:grid-cols-2 lg:grid-cols-3">
          {filtered.map((guide, index) => (
            <Link
              key={guide.id}
              href={`/${guide.slug}`}
              prefetch={false}
              className="group rounded-xl outline-none focus-visible:ring-2 focus-visible:ring-ring"
            >
              <Card className="h-full overflow-hidden py-0 transition-transform group-hover:-translate-y-0.5">
                <div className="relative aspect-square bg-muted">
                  <Image
                    src={guide.coverUrl}
                    alt={`ไกด์ ${guide.name}`}
                    fill
                    fetchPriority={index === 0 ? "high" : undefined}
                    sizes="(min-width: 1024px) 33vw, (min-width: 640px) 50vw, 100vw"
                    className="object-cover"
                  />
                </div>
                <CardHeader className="pt-5">
                  <CardTitle>{guide.name}</CardTitle>
                  <CardAction
                    className={(presence?.byGuide[guide.id] ?? 0) > 0 ? undefined : "invisible"}
                  >
                    <Badge variant="secondary" className="min-w-14 tabular-nums">
                      <UsersIcon data-icon="inline-start" />
                      {presence?.byGuide[guide.id] ?? 0} คน
                    </Badge>
                  </CardAction>
                  <CardDescription className="line-clamp-3">
                    {guide.overview}
                  </CardDescription>
                  <div className="flex flex-wrap gap-2 pt-2">
                    {guide.publishedCatalogVersion ? <Badge variant="outline">v{guide.publishedCatalogVersion}</Badge> : null}
                  </div>
                </CardHeader>
              </Card>
            </Link>
          ))}
        </div>
      ) : (
        <Empty className="border">
          <EmptyHeader>
            <EmptyTitle>ไม่พบไกด์</EmptyTitle>
            <EmptyDescription>ลองค้นหาด้วยชื่อตัวละครอื่น</EmptyDescription>
          </EmptyHeader>
        </Empty>
      )}
    </div>
  );
}

function GuideFilter({
  label,
  value,
  options,
  optionLabels = {},
  includeAll = true,
  onChange,
}: {
  label: string;
  value: string;
  options: string[];
  optionLabels?: Record<string, string>;
  includeAll?: boolean;
  onChange: (value: string) => void;
}) {
  return (
    <Select value={value} onValueChange={(next) => next && onChange(next)}>
      <SelectTrigger aria-label={label}>
        <SelectValue>{optionLabels[value] ?? (value === "all" ? label : value)}</SelectValue>
      </SelectTrigger>
      <SelectContent>
        <SelectGroup>
          {includeAll ? <SelectItem value="all">{label}: ทั้งหมด</SelectItem> : null}
          {options.map((option) => (
            <SelectItem key={option} value={option}>{optionLabels[option] ?? option}</SelectItem>
          ))}
        </SelectGroup>
      </SelectContent>
    </Select>
  );
}