// components/Autocomplete.js
import { $, $html, $for } from "../sigpro.js";
import { val } from "../core/utils.js";
import { tt } from "../core/i18n.js";
import { Input } from "./Input.js";

/**
 * Autocomplete component
 * 
 * daisyUI classes used:
 * - input, input-bordered, input-primary, input-secondary
 * - menu, menu-dropdown, menu-dropdown-show
 * - bg-base-100, rounded-box, shadow-xl, border, border-base-300
 * - absolute, left-0, w-full, mt-1, p-2, max-h-60, overflow-y-auto
 * - z-50, active, bg-primary, text-primary-content
 */
export const Autocomplete = (props) => {
  const { class: className, items = [], value, onSelect, label, placeholder, ...rest } = props;

  const query = $(val(value) || "");
  const isOpen = $(false);
  const cursor = $(-1);

  const list = $(() => {
    const q = query().toLowerCase();
    const data = val(items) || [];
    return q 
      ? data.filter((o) => (typeof o === "string" ? o : o.label).toLowerCase().includes(q)) 
      : data;
  });

  const pick = (opt) => {
    const valStr = typeof opt === "string" ? opt : opt.value;
    const labelStr = typeof opt === "string" ? opt : opt.label;

    query(labelStr);
    if (typeof value === "function") value(valStr);
    onSelect?.(opt);

    isOpen(false);
    cursor(-1);
  };

  const nav = (e) => {
    const items = list();
    if (e.key === "ArrowDown") {
      e.preventDefault();
      isOpen(true);
      cursor(Math.min(cursor() + 1, items.length - 1));
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      cursor(Math.max(cursor() - 1, 0));
    } else if (e.key === "Enter" && cursor() >= 0) {
      e.preventDefault();
      pick(items[cursor()]);
    } else if (e.key === "Escape") {
      isOpen(false);
    }
  };

  return $html("div", { class: 'relative w-full' }, [
    Input({
      label,
      class: className, 
      placeholder: placeholder || tt("search")(),
      value: query,
      onfocus: () => isOpen(true),
      onblur: () => setTimeout(() => isOpen(false), 150),
      onkeydown: nav,
      oninput: (e) => {
        const v = e.target.value;
        query(v);
        if (typeof value === "function") value(v);
        isOpen(true);
        cursor(-1);
      },
      ...rest,
    }),
    $html(
      "ul",
      {
        class: "absolute left-0 w-full menu bg-base-100 rounded-box mt-1 p-2 shadow-xl max-h-60 overflow-y-auto border border-base-300 z-50",
        style: () => (isOpen() && list().length ? "display:block" : "display:none"),
      },
      [
        $for(
          list,
          (opt, i) =>
            $html("li", {}, [
              $html(
                "a",
                {
                  class: () => `block w-full ${cursor() === i ? "active bg-primary text-primary-content" : ""}`,
                  onclick: () => pick(opt),
                  onmouseenter: () => cursor(i),
                },
                typeof opt === "string" ? opt : opt.label,
              ),
            ]),
          (opt, i) => (typeof opt === "string" ? opt : opt.value) + i,
        ),
        () => (list().length ? null : $html("li", { class: "p-2 text-center opacity-50" }, tt("nodata")())),
      ],
    ),
  ]);
};