"use client";

import { useEffect, useMemo, useRef, useState } from "react";
import { useRouter } from "next/navigation";
import { AnimatePresence, motion } from "motion/react";
import { HexMark } from "@/components/honeycomb";

export interface PaletteEntry {
  href: string;
  label: string;
  section: "pages" | "actions";
}

/**
 * Schnellsuche fuer den Admin-Bereich (Strg/Cmd + K): jede Seite und die
 * haeufigsten Aktionen sind zwei Tastendruecke entfernt, statt durch die
 * Seitenleiste zu scrollen. Pfeiltasten waehlen, Enter springt, Esc schliesst.
 *
 * Sucht tolerant: jedes getippte Wort muss irgendwo im Eintrag vorkommen
 * ("neu gut" findet "Neuen Gutschein anlegen"). Ziele sind ausschliesslich
 * die fest hinterlegten Eintraege, nie die Eingabe selbst.
 */
export function AdminCommandPalette({
  entries,
  labels,
  open,
  onOpenChange,
}: {
  entries: PaletteEntry[];
  labels: { placeholder: string; noResults: string; pages: string; actions: string; dialog: string };
  open: boolean;
  onOpenChange: (open: boolean) => void;
}) {
  const router = useRouter();
  const [query, setQuery] = useState("");
  const [active, setActive] = useState(0);
  const inputRef = useRef<HTMLInputElement>(null);

  // Globale Tastenkombination — auch wenn der Fokus gerade woanders liegt.
  useEffect(() => {
    const onKey = (event: KeyboardEvent) => {
      if ((event.ctrlKey || event.metaKey) && event.key.toLowerCase() === "k") {
        event.preventDefault();
        onOpenChange(!open);
      }
    };
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, [open, onOpenChange]);

  const results = useMemo(() => {
    const words = query.toLowerCase().split(/\s+/).filter(Boolean);
    if (words.length === 0) return entries;
    return entries.filter((entry) => words.every((word) => entry.label.toLowerCase().includes(word)));
  }, [entries, query]);

  function close() {
    onOpenChange(false);
    setQuery("");
    setActive(0);
  }

  function go(entry: PaletteEntry | undefined) {
    if (!entry) return;
    close();
    router.push(entry.href);
  }

  function onKeyDown(event: React.KeyboardEvent<HTMLInputElement>) {
    if (event.key === "Escape") {
      close();
    } else if (event.key === "ArrowDown") {
      event.preventDefault();
      setActive((i) => Math.min(results.length - 1, i + 1));
    } else if (event.key === "ArrowUp") {
      event.preventDefault();
      setActive((i) => Math.max(0, i - 1));
    } else if (event.key === "Enter") {
      event.preventDefault();
      go(results[active]);
    }
  }

  return (
    <AnimatePresence>
      {open ? (
        <motion.div
          className="fixed inset-0 z-[65] flex items-start justify-center bg-forest/40 px-4 pt-[15vh] backdrop-blur-[2px]"
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          exit={{ opacity: 0 }}
          onMouseDown={(event) => {
            if (event.target === event.currentTarget) close();
          }}
        >
          <motion.div
            role="dialog"
            aria-modal="true"
            aria-label={labels.dialog}
            initial={{ opacity: 0, y: -12, scale: 0.98 }}
            animate={{ opacity: 1, y: 0, scale: 1 }}
            exit={{ opacity: 0, y: -8, scale: 0.98, transition: { duration: 0.12 } }}
            transition={{ duration: 0.22, ease: [0.16, 1, 0.3, 1] }}
            onAnimationComplete={() => inputRef.current?.focus()}
            className="w-full max-w-lg overflow-hidden border border-ink/10 bg-background shadow-[0_40px_80px_-30px_rgba(36,53,43,0.6)]"
          >
            <div className="flex items-center gap-3 border-b border-ink/10 px-5">
              <svg viewBox="0 0 24 24" className="h-4 w-4 flex-shrink-0 text-ink/45" fill="none" stroke="currentColor" strokeWidth="1.6" aria-hidden="true">
                <circle cx="11" cy="11" r="6.5" />
                <path d="m16 16 4.5 4.5" strokeLinecap="round" />
              </svg>
              <input
                ref={inputRef}
                autoFocus
                value={query}
                onChange={(event) => {
                  setQuery(event.target.value);
                  setActive(0);
                }}
                onKeyDown={onKeyDown}
                placeholder={labels.placeholder}
                role="combobox"
                aria-expanded="true"
                aria-controls="admin-palette-results"
                aria-activedescendant={results[active] ? `palette-${active}` : undefined}
                className="h-14 w-full bg-transparent text-base focus:outline-none focus-visible:outline-none focus:shadow-none"
              />
              <kbd className="flex-shrink-0 border border-ink/15 px-1.5 py-0.5 text-[10px] text-ink/50">Esc</kbd>
            </div>
            <ul id="admin-palette-results" role="listbox" className="max-h-80 overflow-y-auto py-2">
              {results.length === 0 ? (
                <li className="px-5 py-6 text-center text-sm text-ink/60">{labels.noResults}</li>
              ) : null}
              {results.map((entry, i) => {
                const showSection = i === 0 || results[i - 1].section !== entry.section;
                return (
                  <li key={entry.href + entry.label} role="presentation">
                    {showSection ? (
                      <p className="px-5 pb-1 pt-3 text-[10px] tracking-wide-caps text-ink/45">
                        {entry.section === "pages" ? labels.pages : labels.actions}
                      </p>
                    ) : null}
                    <button
                      id={`palette-${i}`}
                      type="button"
                      role="option"
                      aria-selected={i === active}
                      onMouseEnter={() => setActive(i)}
                      onClick={() => go(entry)}
                      className={`flex w-full items-center gap-3 px-5 py-2.5 text-left text-sm transition-colors ${
                        i === active ? "bg-honey/10 text-heading" : "text-ink/75"
                      }`}
                    >
                      <HexMark
                        filled={i === active}
                        className={`h-2.5 w-2.5 flex-shrink-0 ${i === active ? "text-honey-dark" : "text-ink/25"}`}
                      />
                      <span className="flex-1">{entry.label}</span>
                      {i === active ? (
                        <kbd className="border border-ink/15 px-1.5 py-0.5 text-[10px] text-ink/50">Enter</kbd>
                      ) : null}
                    </button>
                  </li>
                );
              })}
            </ul>
          </motion.div>
        </motion.div>
      ) : null}
    </AnimatePresence>
  );
}