import type { NullableChildType, ChildNodeType } from '../../types.ts';
import { TextNode } from '../TextNode.ts';
import { NODE_TYPE } from '../../constants.ts';

export function normalizeChildren(
    children: NullableChildType[],
): ChildNodeType[] {
    const result: any[] = [];

    for (const child of children) {
        if (child && typeof child !== 'boolean') {
            if (typeof child === 'string' || typeof child === 'number') {
                result.push(new TextNode(`${child}`));
            } else if (Array.isArray(child)) {
                normalizeChildren(child).forEach((normalized) =>
                    result.push(normalized),
                );
            } else if (
                child.type === NODE_TYPE.ELEMENT ||
                child.type === NODE_TYPE.TEXT ||
                child.type === NODE_TYPE.COMPONENT
            ) {
                result.push(child);
            } else {
                throw new TypeError(`Unrecognized node type: ${typeof child}`);
            }
        }
    }

    return result;
}