import { CaretNode, h, t, VNode } from "@caret-js/core";
import { VariableNode } from "./variable";

export class FunctionDefinitionNode extends CaretNode {
  constructor(
    public name: string,
    public args: VariableNode[] = [],
    public body: CaretNode
  ) {
    super();
  }

  static from(
    name: string,
    args: VariableNode[] = [],
    body: CaretNode
  ): FunctionDefinitionNode {
    return new FunctionDefinitionNode(name, args, body);
  }

  toDebugMathML(): VNode {
    return h(
      "mrow",
      {},
      h("mi", {}, t(this.name)),
      h("mo", { stretchy: "true" }, t("(")),
      ...this.args.flatMap((arg, index) => [
        arg.toDebugMathML(),
        index < this.args.length - 1 ? h("mo", {}, t(",")) : null,
      ]),
      h("mo", { stretchy: "true" }, t(")")),
      h("mo", {}, t("=")),
      this.body.toDebugMathML()
    );
  }
}