// components/Tabs.js
import { Tag, $, Watch } from "sigpro";

export const Tabs = (props) => {
  const { items, class: className, onTabClose, ...rest } = props;
  const itemsSignal = typeof items === "function" ? items : () => items || [];
  const activeIndex = $(0);

  Watch(() => {
    const list = itemsSignal();
    const idx = list.findIndex(it => {
      const active = it.active;
      return typeof active === "function" ? active() : active;
    });
    if (idx !== -1 && activeIndex() !== idx) activeIndex(idx);
  });

  const removeTab = (idx, item) => {
    item.onClose?.();
    onTabClose?.(item, idx);
    const current = itemsSignal();
    if (typeof items !== "function" || items._isComputed) return;
    const newItems = current.filter((_, i) => i !== idx);
    items(newItems);
    if (newItems.length) {
      let newIdx = activeIndex();
      if (idx < newIdx) newIdx--;
      else if (idx === newIdx) newIdx = Math.min(newIdx, newItems.length - 1);
      activeIndex(newIdx);
    }
  };

  return Tag("div", { ...rest, class: `tabs ${className || ''}`.trim() }, () => {
    const list = itemsSignal();
    const elements = [];
    for (let i = 0; i < list.length; i++) {
      const item = list[i];
      const label = typeof item.label === "function" ? item.label() : item.label;
      const closable = typeof item.closable === "function" ? item.closable() : item.closable;

      const btnContent = closable
        ? Tag("span", { class: "flex items-center" }, [
            label,
            Tag("span", {
              class: "icon-[lucide--x] w-3.5 h-3.5 ml-2 cursor-pointer hover:opacity-70",
              onclick: (e) => { e.stopPropagation(); removeTab(i, item); }
            })
          ])
        : label;

      const tabBtn = Tag("button", {
        class: () => `tab ${activeIndex() === i ? 'tab-active' : ''}`,
        onclick: (e) => {
          e.preventDefault();
          const disabled = typeof item.disabled === "function" ? item.disabled() : item.disabled;
          if (!disabled) {
            item.onclick?.();
            activeIndex(i);
          }
        }
      }, btnContent);

      elements.push(item.tip ? Tag("div", { class: "tooltip", "data-tip": item.tip }, tabBtn) : tabBtn);

      const content = typeof item.content === "function" ? item.content() : item.content;
      elements.push(
        Tag("div", {
          class: "tab-content bg-base-100 border-base-300 p-6",
          style: () => `display: ${activeIndex() === i ? 'block' : 'none'}`
        }, content)
      );
    }
    return elements;
  });
};