"use client";

// Befehls-Palette (Cmd/Ctrl+K): schnelles Springen zwischen Plänen und Szenarien plus
// die wichtigsten Aktionen -- der Effizienz-Pfad für geübte Nutzer, ohne der Maus-
// Bedienung etwas wegzunehmen.

import { useEffect, useMemo, useRef, useState } from "react";
import { CornerDownLeft, Search } from "lucide-react";
import type { PlanListItem } from "@/lib/types";

export interface PaletteAction {
  id: string;
  label: string;
  hint?: string;
  run: () => void;
}

export function CommandPalette({
  open,
  onClose,
  plans,
  actions,
  onOpenScenario,
}: {
  open: boolean;
  onClose: () => void;
  plans: PlanListItem[];
  actions: PaletteAction[];
  onOpenScenario: (id: string) => void;
}) {
  const [query, setQuery] = useState("");
  const [index, setIndex] = useState(0);
  const inputRef = useRef<HTMLInputElement | null>(null);

  const items = useMemo<PaletteAction[]>(() => {
    const scenarioItems: PaletteAction[] = plans.flatMap((p) =>
      p.scenarios.map((s) => ({
        id: `s-${s.id}`,
        label: `${p.name} · ${s.name}`,
        hint: "Szenario öffnen",
        run: () => onOpenScenario(s.id),
      }))
    );
    const all = [...actions, ...scenarioItems];
    const q = query.trim().toLowerCase();
    if (!q) return all;
    return all.filter((i) => i.label.toLowerCase().includes(q));
  }, [plans, actions, query, onOpenScenario]);

  useEffect(() => {
    if (open) {
      // eslint-disable-next-line react-hooks/set-state-in-effect -- Reset beim Öffnen
      setQuery("");
      setIndex(0);
      requestAnimationFrame(() => inputRef.current?.focus());
    }
  }, [open]);

  useEffect(() => {
    // eslint-disable-next-line react-hooks/set-state-in-effect -- Auswahl folgt der Eingabe
    setIndex(0);
  }, [query]);

  if (!open) return null;

  function choose(item: PaletteAction | undefined) {
    if (!item) return;
    onClose();
    item.run();
  }

  return (
    <div className="ui-fade fixed inset-0 z-50 flex items-start justify-center bg-black/40 px-4 pt-[15vh]" onClick={onClose}>
      <div
        onClick={(e) => e.stopPropagation()}
        className="ui-pop w-full max-w-lg overflow-hidden rounded-2xl border border-border bg-surface shadow-2xl"
      >
        <div className="flex items-center gap-2 border-b border-border px-4 py-3">
          <Search className="h-4 w-4 shrink-0 text-faint" />
          <input
            ref={inputRef}
            value={query}
            onChange={(e) => setQuery(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === "ArrowDown") {
                e.preventDefault();
                setIndex((i) => Math.min(i + 1, items.length - 1));
              } else if (e.key === "ArrowUp") {
                e.preventDefault();
                setIndex((i) => Math.max(i - 1, 0));
              } else if (e.key === "Enter") {
                e.preventDefault();
                choose(items[index]);
              } else if (e.key === "Escape") {
                onClose();
              }
            }}
            placeholder="Plan, Szenario oder Aktion suchen…"
            className="w-full bg-transparent text-sm text-fg outline-none placeholder:text-faint"
          />
          <kbd className="rounded border border-border bg-surface-2 px-1.5 py-0.5 text-[10px] text-faint">ESC</kbd>
        </div>
        <div className="max-h-80 overflow-y-auto py-1">
          {items.length === 0 && <p className="px-4 py-3 text-sm text-muted">Nichts gefunden.</p>}
          {items.slice(0, 40).map((item, i) => (
            <button
              key={item.id}
              type="button"
              onMouseEnter={() => setIndex(i)}
              onClick={() => choose(item)}
              className={`flex w-full items-center justify-between gap-3 px-4 py-2 text-left text-sm ${
                i === index ? "bg-accent-soft text-accent-soft-fg" : "text-fg"
              }`}
            >
              <span className="min-w-0 flex-1 truncate">{item.label}</span>
              <span className="flex items-center gap-1.5 text-[10px] text-faint">
                {item.hint}
                {i === index && <CornerDownLeft className="h-3 w-3" />}
              </span>
            </button>
          ))}
        </div>
      </div>
    </div>
  );
}