"use client"

import { useMemo, useRef, useState } from "react"
import Link from "next/link"
import { ChevronRight, FileText, Search, X } from "lucide-react"

import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Separator } from "@/components/ui/separator"
import { Skeleton } from "@/components/ui/skeleton"
import { PrintPolicy } from "@/components/print-policy"
import { usePublicPrivacyPolicies } from "@/hooks/use-privacy-policies"
import { formatDate } from "@/lib/format"
import { PrivacyPolicy } from "@/types/privacy-policy"

export function PolicyList({ initial }: { initial: PrivacyPolicy[] }) {
  const { policies, isLoading, error } = usePublicPrivacyPolicies(initial)
  const [searchTerm, setSearchTerm] = useState("")
  const searchRef = useRef<HTMLInputElement>(null)
  const resetSearch = () => { setSearchTerm(""); searchRef.current?.focus() }

  const filteredPolicies = useMemo(() => {
    const term = searchTerm.trim().toLowerCase()
    if (!term) return policies

    return policies.filter((policy) =>
      [policy.title, policy.responsible, policy.processingDescription].some((field) =>
        field.toLowerCase().includes(term)
      )
    )
  }, [policies, searchTerm])

  return (
    <main id="inhalt" tabIndex={-1} className="mx-auto w-full max-w-5xl flex-1 px-4 py-6 sm:px-6 sm:py-8">
      <div className="mb-6 flex flex-col gap-4 sm:flex-row sm:items-end sm:justify-between">
        <div className="space-y-1.5">
          <h1 className="text-2xl font-semibold tracking-tight">
            Datenschutzerklärungen
          </h1>
          <p className="text-sm text-muted-foreground">
            Transparente Informationen zu unserer Datenverarbeitung nach DSGVO
          </p>
        </div>

        <div className="w-full sm:w-72">
          <label htmlFor="suche" className="sr-only">
            Datenschutzerklärungen durchsuchen
          </label>
          <div className="relative">
            <Search
              aria-hidden="true"
              className="pointer-events-none absolute top-1/2 left-3 size-4 -translate-y-1/2 text-muted-foreground"
            />
            <Input
              id="suche"
              ref={searchRef}
              type="search"
              placeholder="Suchen…"
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="px-9"
            />
            {searchTerm && (
              <Button
                variant="ghost"
                size="icon-sm"
                onClick={resetSearch}
                className="absolute top-1/2 right-0.5 -translate-y-1/2 text-muted-foreground"
              >
                <X aria-hidden="true" />
                <span className="sr-only">Suche zurücksetzen</span>
              </Button>
            )}
          </div>
        </div>
      </div>

      {error ? (
        <div className="rounded-lg border border-destructive/30 bg-destructive/5 p-4 text-sm text-destructive">
          Fehler beim Laden der Daten: {error.message}
        </div>
      ) : isLoading ? (
        <div className="divide-y rounded-lg border">
          {Array.from({ length: 4 }).map((_, index) => (
            <div key={index} className="flex items-center gap-4 p-4">
              <Skeleton className="size-9 rounded-lg" />
              <div className="flex-1 space-y-2">
                <Skeleton className="h-4 w-1/3" />
                <Skeleton className="h-3.5 w-1/2" />
              </div>
              <Skeleton className="h-4 w-20" />
            </div>
          ))}
        </div>
      ) : filteredPolicies.length === 0 ? (
        <div className="flex flex-col items-center gap-3 rounded-lg border border-dashed px-6 py-16 text-center">
          <div className="flex size-12 items-center justify-center rounded-full bg-muted">
            <FileText className="size-6 text-muted-foreground" />
          </div>
          <p className="font-medium">
            {searchTerm
              ? "Keine Treffer"
              : "Keine Datenschutzerklärungen verfügbar"}
          </p>
          <p className="max-w-sm text-sm text-muted-foreground">
            {searchTerm
              ? "Versuchen Sie einen anderen Suchbegriff."
              : "Derzeit sind keine öffentlichen Datenschutzerklärungen hinterlegt."}
          </p>
          {searchTerm && (
            <Button variant="outline" onClick={resetSearch}>
              Suche zurücksetzen
            </Button>
          )}
        </div>
      ) : (
        <ul className="divide-y overflow-hidden rounded-lg border bg-card">
          {filteredPolicies.map((policy) => (
            <li
              key={policy.id}
              className="group flex flex-wrap items-center gap-x-3 gap-y-1 px-3 transition-colors hover:bg-muted/40 sm:flex-nowrap"
            >
              {/* Echter Link: teilbar, in neuem Tab zu öffnen, ohne JavaScript
                  nutzbar. Der Pfeil gehört mit hinein, statt daneben ein
                  zweiter Link auf dasselbe Ziel zu stehen. */}
              <Link
                href={`/erklaerung/${policy.slug}`}
                className="flex min-w-0 flex-1 items-center gap-3 rounded-md py-4 outline-none focus-visible:ring-[3px] focus-visible:ring-ring"
              >
                <span
                  aria-hidden="true"
                  className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-brand/10 text-brand"
                >
                  <FileText className="size-4.5" />
                </span>
                <span className="min-w-0 flex-1">
                  <span className="block font-medium">{policy.title}</span>
                  <span className="mt-0.5 block truncate text-sm text-muted-foreground">
                    {policy.responsible.replace(/[*_#`]/g, "").split("\n")[0]}
                  </span>
                </span>
                <ChevronRight
                  aria-hidden="true"
                  className="hidden size-4 shrink-0 text-muted-foreground group-hover:text-foreground sm:block"
                />
              </Link>

              <div className="flex shrink-0 items-center gap-2 pb-3 sm:pb-0">
                <span className="text-sm text-muted-foreground">
                  <span className="sr-only">Zuletzt geändert: </span>
                  {formatDate(policy.updatedAt)}
                </span>
                <Separator orientation="vertical" className="h-5" />
                <PrintPolicy policy={policy} size="icon-sm" variant="ghost" />
              </div>
            </li>
          ))}
        </ul>
      )}

      <p role="status" aria-live="polite" aria-atomic="true" className="mt-4 text-sm text-muted-foreground">
        {error ? "Fehler beim Laden der Datenschutzerklärungen." : isLoading ? "Datenschutzerklärungen werden geladen…" : filteredPolicies.length + (filteredPolicies.length === 1 ? " Erklärung" : " Erklärungen") + (searchTerm ? " von " + policies.length : "")}
      </p>
    </main>
  )
}