import jsTokens from 'js-tokens';

const FILL_COMMENT = " ";
function stripLiteralFromToken(token, fillChar, filter) {
  if (token.type === "SingleLineComment") {
    return FILL_COMMENT.repeat(token.value.length);
  }
  if (token.type === "MultiLineComment") {
    return token.value.replace(/[^\n]/g, FILL_COMMENT);
  }
  if (token.type === "StringLiteral") {
    if (!token.closed) {
      return token.value;
    }
    const body = token.value.slice(1, -1);
    if (filter(body)) {
      return token.value[0] + fillChar.repeat(body.length) + token.value[token.value.length - 1];
    }
  }
  if (token.type === "NoSubstitutionTemplate") {
    const body = token.value.slice(1, -1);
    if (filter(body)) {
      return `\`${body.replace(/[^\n]/g, fillChar)}\``;
    }
  }
  if (token.type === "RegularExpressionLiteral") {
    const body = token.value;
    if (filter(body)) {
      return body.replace(/\/(.*)\/(\w?)$/g, (_, $1, $2) => `/${fillChar.repeat($1.length)}/${$2}`);
    }
  }
  if (token.type === "TemplateHead") {
    const body = token.value.slice(1, -2);
    if (filter(body)) {
      return `\`${body.replace(/[^\n]/g, fillChar)}\${`;
    }
  }
  if (token.type === "TemplateTail") {
    const body = token.value.slice(0, -2);
    if (filter(body)) {
      return `}${body.replace(/[^\n]/g, fillChar)}\``;
    }
  }
  if (token.type === "TemplateMiddle") {
    const body = token.value.slice(1, -2);
    if (filter(body)) {
      return `}${body.replace(/[^\n]/g, fillChar)}\${`;
    }
  }
  return token.value;
}
function optionsWithDefaults(options) {
  return {
    fillChar: options?.fillChar ?? " ",
    filter: options?.filter ?? (() => true)
  };
}
function stripLiteral(code, options) {
  let result = "";
  const _options = optionsWithDefaults(options);
  for (const token of jsTokens(code, { jsx: false })) {
    result += stripLiteralFromToken(token, _options.fillChar, _options.filter);
  }
  return result;
}
function stripLiteralDetailed(code, options) {
  let result = "";
  const tokens = [];
  const _options = optionsWithDefaults(options);
  for (const token of jsTokens(code, { jsx: false })) {
    tokens.push(token);
    result += stripLiteralFromToken(token, _options.fillChar, _options.filter);
  }
  return {
    result,
    tokens
  };
}

export { stripLiteral, stripLiteralDetailed, stripLiteralDetailed as stripLiteralJsTokens };