import { inspect } from 'node:util';
import { symbolFunction, symbolList, symbolProduct, symbolSum } from '../structures/types.js';

export function pretty(obj) {
  return inspect(obj, { colors: true, depth: null, breakLength: 120 });
}

// Pretty print type
export function prettyT(type) {
  // console.log("pretty:", type);
  if (typeof type === "symbol") {
    return type.description;
  }
  if (type.typeVars) {
    if (type.typeVars.size > 0) {
      return `∀${[...type.typeVars].map(prettyT).sort((a, b) => a.localeCompare(b)).join(",")}: ${prettyT(type.type)}`;
    }
    else {
      return prettyT(type.type);
    }
  }
  if (type.symbol === symbolFunction) {
    return `(${prettyT(type.params[0])} -> ${prettyT(type.params[1])})`;
  }
  if (type.symbol === symbolList) {
    return `[${prettyT(type.params[0])}]`;
  }
  if (type.symbol === symbolProduct) {
    return `(${prettyT(type.params[0])} × ${prettyT(type.params[1])})`;
  }
  if (type.symbol === symbolSum) {
    return `(${prettyT(type.params[0])} | ${prettyT(type.params[1])})`;
  }
  if (type.params.length === 0) {
    return type.symbol.description;
  }
  return `${type.symbol.description}(${type.params.map(prettyT).join(", ")})`;
}