let R = require('ramda');

// JSON.stringify(crudOpenApiEndpoints({ single: 'app' }))
function crudOpenApiEndpoints ({ single, plural = single + 's', id = 'id', type = 'integer' }) {
  let up = (s) => s[0].toUpperCase() + s.substring(1);
  let $ref = `#/definitions/${up(single)}`;
  let resp = R.merge({ description: 'OK' });
  let responses = { 204: resp({}) }; // empty non-GET response
  let idPar = { name: id, in: 'path', required: true, type };
  let bodyPar = { name: single, in: 'body', required: true, schema: { $ref } };
  return {
    [`/${plural}`]: {
      get: {
        responses: {
          200: resp({
            // schema: { type: 'array', items: { $ref } },
            schema: { $ref: `#/definitions/${up(plural)}` },
          }),
        },
      },
      post: {
        parameters: [bodyPar],
        responses,
      },
    },
    [`/${plural}/{id}`]: {
      get: {
        parameters: [idPar],
        responses: {
          200: resp({
            schema: { $ref },
          }),
        },
      },
      delete: {
        parameters: [idPar],
        responses,
      },
      put: {
        parameters: [idPar, bodyPar],
        responses,
      },
    },
  };
}