import * as AST from '../ast';
import Env, { EnvError } from '../env';

export class Rule {
  public property: AST.Property;
  public value: AST.Value;

  public constructor(
    property: AST.Property,
    value: AST.Value
  ) {
    this.property = property;
    this.value = value;
  }

  public compile(env: Env, opts: AST.Opts): string | EnvError {
    const wordSpacer = opts.prettyPrint ? ' ' : '';
    const indentSpacer = opts.prettyPrint ? '  ' + Array(opts.depth).fill(' ').join('') : '';
    const property = this.property.compile(env, opts);
    if (property instanceof EnvError) return property;
    const value = this.value.compile(env, opts);
    if (value instanceof EnvError) return value;
    return `${indentSpacer}${property}:${wordSpacer}${value};`;
  }
}