"use client"

import { useMemo, useState } from "react"
import { ChevronRight, FileText, Search, Settings2, 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 { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip"
import { Brand } from "@/components/brand"
import { PolicyDetail } from "@/components/policy-detail"
import { PrintPolicy } from "@/components/print-policy"
import { ThemeToggle } from "@/components/theme-toggle"
import { usePublicPrivacyPolicies } from "@/hooks/use-privacy-policies"
import { PrivacyPolicy } from "@/types/privacy-policy"
import { formatDate } from "@/lib/format"

export default function PublicDashboard() {
  const { policies, isLoading, error } = usePublicPrivacyPolicies()
  const [selectedPolicy, setSelectedPolicy] = useState<PrivacyPolicy | null>(null)
  const [isDetailOpen, setIsDetailOpen] = useState(false)
  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])

  const handleViewDetails = (policy: PrivacyPolicy) => {
    setSelectedPolicy(policy)
    setIsDetailOpen(true)
  }

  return (
    <div className="min-h-screen bg-background">
      <header className="sticky top-0 z-40 border-b bg-background/80 backdrop-blur supports-[backdrop-filter]:bg-background/60">
        <div className="mx-auto flex h-14 max-w-5xl items-center justify-between gap-4 px-6">
          <Brand subtitle="Datenschutz" />
          <div className="flex items-center gap-1">
            <ThemeToggle />
            <Tooltip>
              <TooltipTrigger asChild>
                <Button
                  variant="ghost"
                  size="icon"
                  onClick={() => window.open("/admin", "_blank")}
                >
                  <Settings2 />
                  <span className="sr-only">Admin-Bereich</span>
                </Button>
              </TooltipTrigger>
              <TooltipContent>Admin-Bereich</TooltipContent>
            </Tooltip>
          </div>
        </div>
      </header>

      <main className="mx-auto max-w-5xl 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"
              >
                <button
                  type="button"
                  onClick={() => handleViewDetails(policy)}
                  className="flex min-w-0 flex-1 cursor-pointer items-center gap-3 rounded-md py-4 text-left 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>
                </button>

                <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"
                    onClick={() => handleViewDetails(policy)}
                    className="text-muted-foreground group-hover:text-foreground"
                  >
                    <ChevronRight />
                    <span className="sr-only">Details anzeigen</span>
                  </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>

      <PolicyDetail
        policy={selectedPolicy}
        open={isDetailOpen}
        onOpenChange={setIsDetailOpen}
      />
    </div>
  )
}