"use client"

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

import { Badge } from "@/components/ui/badge"
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 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 className="mx-auto w-full max-w-5xl flex-1 px-6 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="relative w-full sm:w-72">
          <Search className="pointer-events-none absolute top-1/2 left-3 size-4 -translate-y-1/2 text-muted-foreground" />
          <Input
            placeholder="Suchen…"
            value={searchTerm}
            onChange={(e) => setSearchTerm(e.target.value)}
            className="px-9"
          />
          {searchTerm && (
            <Button
              variant="ghost"
              size="icon-sm"
              onClick={() => setSearchTerm("")}
              className="absolute top-1/2 right-0.5 -translate-y-1/2 text-muted-foreground"
            >
              <X />
              <span className="sr-only">Suche zurücksetzen</span>
            </Button>
          )}
        </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={() => setSearchTerm("")}>
              Suche zurücksetzen
            </Button>
          )}
        </div>
      ) : (
        <div className="divide-y overflow-hidden rounded-lg border bg-card">
          {filteredPolicies.map((policy) => (
            <div
              key={policy.id}
              className="group flex items-center gap-3 px-3 transition-colors hover:bg-muted/40"
            >
              {/* Echter Link: teilbar, in neuem Tab zu öffnen, ohne JavaScript nutzbar */}
              <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/50"
              >
                <span 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 truncate 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>
              </Link>

              <div className="flex shrink-0 items-center gap-2 pr-1">
                <span className="hidden text-sm text-muted-foreground sm:inline">
                  {formatDate(policy.updatedAt)}
                </span>
                <Separator orientation="vertical" className="hidden h-5 sm:block" />
                <PrintPolicy policy={policy} size="icon-sm" variant="ghost" />
                <Button
                  variant="ghost"
                  size="icon-sm"
                  asChild
                  className="text-muted-foreground group-hover:text-foreground"
                >
                  <Link href={`/erklaerung/${policy.slug}`}>
                    <ChevronRight />
                    <span className="sr-only">{policy.title} öffnen</span>
                  </Link>
                </Button>
              </div>
            </div>
          ))}
        </div>
      )}

      {!isLoading && !error && filteredPolicies.length > 0 && (
        <div className="mt-4 flex items-center justify-between text-sm text-muted-foreground">
          <span>
            {filteredPolicies.length}{" "}
            {filteredPolicies.length === 1 ? "Erklärung" : "Erklärungen"}
            {searchTerm && ` von ${policies.length}`}
          </span>
          <Badge variant="outline">DSGVO-konform</Badge>
        </div>
      )}
    </main>
  )
}