import { CaretNode, h, t, VNode } from "@caret-js/core";
import { DecimalNode } from "./decimal";
import { MathExpressionTag } from "../tags/mathExpression";
import { CanBeAdjacentMultRightSideTag } from "../parselets/adjacentMultiplication";
import { ParenthesesChildTag } from "../parselets/parentheses";

export class NegativeNode extends CaretNode {
  constructor(public child: CaretNode) {
    super();
    this.addTag(new MathExpressionTag()).addTag(
      new CanBeAdjacentMultRightSideTag(false) // Negative nodes cannot be on the right side of adjacent multiplication (that would just be subtraction)
    );
  }

  static from(child: CaretNode): NegativeNode | DecimalNode {
    if (
      child instanceof DecimalNode &&
      !child.value.startsWith("-") &&
      !child.hasTag(ParenthesesChildTag)
    ) {
      return new DecimalNode(`-${child.value}`);
    }

    return new NegativeNode(child);
  }

  toDebugMathML(): VNode {
    return h("mrow", {}, h("mo", {}, t("-")), this.child.toDebugMathML());
  }
}