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import {
  effect,
  el,
  type ElementSetup,
  isReactive,
  on,
  type ReactiveOrStatic,
} from "../ef.js";
import { type JSXChildren } from "./jsx.js";

export { type JSX } from "./jsx.js";

function setAttribute(el: Element, name: string, value: string | boolean) {
  switch (value) {
    case true:
      el.setAttribute(name, "");
      return;
    case false:
      el.removeAttribute(name);
      return;
    default:
      el.setAttribute(name, value);
  }
}

const EVENT_PATTERN = /^on([A-Z][a-zA-Z]*)$/;

/**
 * This JSX runtime focuses on attributes, because this docs site will be statically HTML rendered.
 */
export function jsx(
  type: string | ((props: any) => Node),
  props: {
    [key: `on${string}`]: (evt: Event) => void;
  } & { [key: string]: ReactiveOrStatic<string | boolean> } & {
    children?: JSXChildren;
  },
): Node {
  if (typeof type === "function") {
    return type(props);
  }

  const { children, ...rest } = props;

  const setups = Object.entries(rest).map<ElementSetup<Element>>(
    ([key, value]) => {
      if (typeof value === "function") {
        if (EVENT_PATTERN.test(key)) {
          const name = key.replace(EVENT_PATTERN, "$1").toLowerCase();
          return on(name, value);
        }

        // ignore invalid
        return () => {};
      }

      if (isReactive(value)) {
        return (el) => {
          effect(() => {
            setAttribute(el, key, value.get());
          });
        };
      }

      return (el) => {
        setAttribute(el, key, value);
      };
    },
  );

  const normalizedChildren = Array.isArray(children)
    ? children.flat()
    : [children];

  return el(type, setups, normalizedChildren);
}

export { jsx as jsxs };