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'use strict';

const JSON5 = require('json5');

const specialValues = {
  null: null,
  true: true,
  false: false,
};

function parseQuery(query) {
  if (query.substr(0, 1) !== '?') {
    throw new Error(
      "A valid query string passed to parseQuery should begin with '?'"
    );
  }

  query = query.substr(1);

  if (!query) {
    return {};
  }

  if (query.substr(0, 1) === '{' && query.substr(-1) === '}') {
    return JSON5.parse(query);
  }

  const queryArgs = query.split(/[,&]/g);
  const result = {};

  queryArgs.forEach((arg) => {
    const idx = arg.indexOf('=');

    if (idx >= 0) {
      let name = arg.substr(0, idx);
      let value = decodeURIComponent(arg.substr(idx + 1));

      if (specialValues.hasOwnProperty(value)) {
        value = specialValues[value];
      }

      if (name.substr(-2) === '[]') {
        name = decodeURIComponent(name.substr(0, name.length - 2));

        if (!Array.isArray(result[name])) {
          result[name] = [];
        }

        result[name].push(value);
      } else {
        name = decodeURIComponent(name);
        result[name] = value;
      }
    } else {
      if (arg.substr(0, 1) === '-') {
        result[decodeURIComponent(arg.substr(1))] = false;
      } else if (arg.substr(0, 1) === '+') {
        result[decodeURIComponent(arg.substr(1))] = true;
      } else {
        result[decodeURIComponent(arg)] = true;
      }
    }
  });

  return result;
}

module.exports = parseQuery;