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

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

const EVENT_HANDLER = /^on(?=[A-Z])/;

function isAttributeValue(x: unknown): x is string | boolean {
  return typeof x === "string" || typeof x === "boolean";
}

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);
  }
}

function setPropertyOrAttribute(
  element: Element,
  name: string,
  value: unknown,
) {
  if (name in element) {
    try {
      // @ts-expect-error: TS is stupid still.
      element[name] = value;
    } catch (error) {
      if (error instanceof TypeError && isAttributeValue(value)) {
        // Probably element[name] was read-only
        setAttribute(element, name, value);
        return;
      }

      console.warn(`Failed to set property "${name}"`, {
        element,
        name,
        value,
      });
    }
    return;
  }

  if (!isAttributeValue(value)) {
    console.warn(
      `The property you specified does not present in the element and the value is not available as an attribute value.`,
      { element, name, value },
    );
    return;
  }

  setAttribute(element, name, value);
}

export function jsx(type: string | ((props: any) => Node), props: any): Node {
  if (typeof type === "function") {
    return type(props);
  }

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

  const setups = Object.entries(rest).map<ElementSetup<Element>>(
    ([key, value]) => {
      if (EVENT_HANDLER.test(key) && typeof value === "function") {
        return on(
          key.replace(EVENT_HANDLER, "").toLowerCase(),
          value as (ev: Event) => unknown,
        );
      }

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

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

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

  return el(type, setups, normalizedChildren);
}

export { jsx as jsxs };