import EnzymeAdapter from './EnzymeAdapter';

export default function validateAdapter(adapter) {
  if (!adapter) {
    throw new Error(`
      Enzyme Internal Error: Enzyme expects an adapter to be configured, but found none.
      To configure an adapter, you should call \`Enzyme.configure({ adapter: new Adapter() })\`
      before using any of Enzyme's top level APIs, where \`Adapter\` is the adapter
      corresponding to the library currently being tested. For example:

      import Adapter from 'enzyme-adapter-react-15';

      To find out more about this, see https://airbnb.io/enzyme/docs/installation/index.html
    `);
  }
  if (typeof adapter === 'function') {
    if (Object.getPrototypeOf(adapter) === EnzymeAdapter) {
      throw new Error(`
        Enzyme Internal Error: Enzyme expects an adapter instance to be configured -
        you provided an adapter *constructor*.
        To configure an adapter, you should call \`Enzyme.configure({ adapter: new Adapter() })\`
        before using any of Enzyme's top level APIs, where \`Adapter\` is the adapter
        corresponding to the library currently being tested. For example:

        import Adapter from 'enzyme-adapter-react-15';

        To find out more about this, see https://airbnb.io/enzyme/docs/installation/index.html
      `);
    }
    throw new Error(`
      Enzyme Internal Error: Enzyme expects an adapter to be configured -
      an enzyme adapter must be an object instance; you provided a function.
      To configure an adapter, you should call \`Enzyme.configure({ adapter: new Adapter() })\`
      before using any of Enzyme's top level APIs, where \`Adapter\` is the adapter
      corresponding to the library currently being tested. For example:

      import Adapter from 'enzyme-adapter-react-15';

      To find out more about this, see https://airbnb.io/enzyme/docs/installation/index.html
    `);
  }
  if (!(adapter instanceof EnzymeAdapter)) {
    throw new Error('Enzyme Internal Error: configured enzyme adapter did not inherit from the EnzymeAdapter base class');
  }
}