// excuse-contract.ts
import * as RestContracts from "rest-contracts";

export enum ExcuseQuality {
  Good = "solid",
  Mediocre = "iffy",
  Poor = "lame"
}

export interface Excuse {
  id: string;
  quality: ExcuseQuality;
  description: string;
}

export const Get =
  RestContracts.CreateAPI.Get
  .PathParameters<{ id: string }>()
  .NoQueryParameters
  .Returns<Excuse>()
  .Path('/excuses/:id/');

export const Query =
  RestContracts.CreateAPI.Get
  .NoPathParameters
  .QueryParameters<{quality?: Excuse["quality"]}>()
  .Returns<Excuse[]>()
  .Path('/excuses/');

export const Put =
  RestContracts.CreateAPI.Put
  .NoPathParameters
  .BodyParameters<Excuse>()
  .Returns<Excuse>()
  .Path("/excuses/");

// server.ts
import * as bodyParser from "body-parser";
import * as express from "express";
import * as RestContracts from "rest-contracts";
import * as RestContractsExpressServer from "rest-contracts-express-server";
import * as ExcuseContract from "./excuse-contract";

// If you're using express, you'll still have to configure it,
// making sure to use bodyParser.json()
const router = express.Router()
const app = express();
// This line causes express to parse JSON responses for you.
app.use(bodyParser.json());
app.use(router);
const PORT = 5000;
app.listen(PORT);

export function run(): void {
  console.log("Starting API server");

  // You'll implement your APIs by calling the implement method of this class.
  // (Want to add authentication or other steps?  Just create a subclass!)
  const ourApi = new RestContractsExpressServer.RestContractsExpressServer(router);

  // Best to create a new file here, import the ourApi class,
  // and separate implementations into different files.
  const excuseMemoryTable =
    new Map<ExcuseContract.Excuse["id"], ExcuseContract.Excuse>();

  // We've merged all params into params, but req, res, & next are still available
  // to you. (We've also added typings to the parameter fields of the req object!)

  // Implement the Excuse Put method
  ourApi.implement(ExcuseContract.Put, (params, req, res, next) => {
    excuseMemoryTable.set( params.id, params );
    return params;
  });

  // Implement the Excuse Get method
  // (leaving out req, res, next since we're not using them)
  ourApi.implement(ExcuseContract.Get, (params) =>
    excuseMemoryTable.get(params.id)
  );

  // Impelmenting the Excuse directory-level Get, which can query on excuse quality
  ourApi.implement(ExcuseContract.Query, (params) =>
    [...excuseMemoryTable.values()].
      filter( values => (!params.quality) || values.quality === params.quality )
  );
}

// client.ts
import * as RestContracts from "rest-contracts";
import {getClientCreationFunction} from "rest-contracts-axios-client";
import * as ExcuseContract from "./excuse-contract";

// To create client calls, the factory needs the URL and any default configuration settings
// we might want to specify.
const createRequestFunction = getClientCreationFunction  ("http://localhost:5000/", {timeout: 5000});

// Call the factory to create a request functio nfor Get, Query, and Put
const excuseClient = {
  get: createRequestFunction(ExcuseContract.Get),
  query: createRequestFunction(ExcuseContract.Query),
  put: createRequestFunction(ExcuseContract.Put),
};

// This function runs our example queries.  Try modifying the requests
// in VSCode to see Intellisense autocomplete parameters, dislpay type
// information, and report type errors.
export async function run(): Promise<void> {
  console.log("Starting API client");

  try {
    // Add two excuses.  Excuses for what?  Not using TypeScript.
    await excuseClient.put({
      id: "df458df",
      quality: ExcuseContract.ExcuseQuality.Poor,
      description: "I don't use TypeScript because I enjoy debugging type errors in production software.",
    });

    console.log("Put the first excuse");

    await excuseClient.put({
      id: "asdflewi",
      quality: ExcuseContract.ExcuseQuality.Poor,
      description: "My nervous systems has a built-in type checker that catches errors before they become keystrokes.",
    });

    console.log("Put the second excuse");

    // Retrieve the second excuse using get with a path parameter.
    const secondExcuse = await excuseClient.get({id: "asdflewi"});

    // Retrieve excuses using Query (get with a query parameter)
    const lameExcuses = await excuseClient.query({quality: ExcuseContract.ExcuseQuality.Poor});
    console.log("Retrieved excuses:", lameExcuses);

    // Retrieve excuses using Query (get with a query parameter)
    const goodExcuses = await excuseClient.query({quality: ExcuseContract.ExcuseQuality.Good});
    console.log("Here are all the valid excuses for not using TypeScript:", goodExcuses);
    console.log("Yup, that's all of them.");

  } catch (error) {
    console.log("Error:", error);
  }
}