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// This module contains convenient helper functions return ElementSetup.

import { type ElementSetup } from "./dom.js";
import { effect, isReactive, type ReactiveOrStatic } from "./signals.js";

export function classList<T extends Element>(
  ...values: readonly ReactiveOrStatic<string | null>[]
): ElementSetup<T> {
  return (el) => {
    for (const value of values) {
      if (isReactive(value)) {
        effect(() => {
          const v = value.get();
          if (v) {
            el.classList.add(v);

            return () => {
              el.classList.remove(v);
            };
          }
        });
        continue;
      }

      if (value) {
        el.classList.add(value);
      }
    }
  };
}

export function style<T extends HTMLElement | SVGElement>(
  name: string,
  value: ReactiveOrStatic<string | null>,
): ElementSetup<T> {
  return (el) => {
    if (isReactive(value)) {
      effect(() => {
        const v = value.get();
        if (v === null) {
          el.style.removeProperty(name);
          return;
        }

        el.style.setProperty(name, v);
      });
      return;
    }

    if (value === null) {
      el.style.removeProperty(name);
      return;
    }

    el.style.setProperty(name, value);
  };
}