"use strict"; require("dotenv").config(); require("date-format-lite");



//  P A C K A G E S

const chalk = require("chalk");
const cors = require("cors");
const dedent = require("dedent");

const fastify = require("fastify")({
  logger: {
    level: "warn",
    prettyPrint: process.env.NODE_ENV === "development" ? true : false
  }
});

const octokit = require("@octokit/rest")();
const redis = require("redis");
const relativeDate = require("relative-date");
const local = require("app-root-path").require;

//  V A R I A B L E S

const github = local("/helpers/github");
const log = console.log; // eslint-disable-line
const logSlackError = local("/helpers/slack");
let client;

if (typeof process.env.GITHUB_OAUTH_TOKEN !== "undefined") {
  octokit.authenticate({
    type: "oauth",
    token: process.env.GITHUB_OAUTH_TOKEN
  });
}

if (typeof process.env.REDISCLOUD_URL !== "undefined") {
  client = redis.createClient(process.env.REDISCLOUD_URL);

  client.on("error", redisError => {
    process.env.NODE_ENV === "development" ?
      log("Unable to connect to Redis client. You may be missing an .env file") :
      logSlackError("An error occured with Redis", redisError)
    ;
  });
}



//  P R O G R A M

fastify.use(cors());

fastify.register(require("fastify-compress"));
fastify.register(require("fastify-ws"));

fastify.register(require("fastify-helmet"), {
  hidePoweredBy: { setTo: "LBRY" }
});

fastify.register(require("fastify-static"), {
  root: `${__dirname}/public/`,
  prefix: "/assets/"
});

fastify.register(require("choo-ssr/fastify"), {
  app: require("./client"),
  plugins: [
    [ require("choo-bundles/ssr"), {} ]
  ]
});

fastify.ready(err => {
  if (err) throw err;

  fastify.ws.on("connection", socket => {
    socket.send(JSON.stringify({ "message": "welcome" }));

    socket.on("message", msg => {
      if (msg === "landed on homepage") {
        generateGitHubFeed(result => {
          socket.send(JSON.stringify({
            "message": "updated html",
            "html": result,
            "selector": "#github-feed"
          }));
        });
      }
    });

    socket.on("close", () => log("Client disconnected.")); // TODO: Close socket?
  });
});



//  B E G I N

const start = async () => {
  try {
    await fastify.listen(process.env.PORT || 8080, process.env.IP || "0.0.0.0");
  } catch (err) {
    fastify.log.error(err);
    process.exit(1);
  }

  process.env.NODE_ENV === "development" ?
    log(`\n— ${chalk.green("⚡")} ${fastify.server.address().port}\n`) :
    logSlackError(`Server started at port \`${fastify.server.address().port}\``)
  ;
};

start();



//  H E L P E R S

function generateGitHubFeed(displayGitHubFeed) {
  if (typeof process.env.REDISCLOUD_URL !== "undefined") {
    client.zrevrange("events", 0, 9, (err, reply) => {
      if (err) return; // TODO: Render a div with nice error message

      const events = [];
      const renderedEvents = [];

      reply.forEach(item => events.push(JSON.parse(item)));

      for (const event of events) {
        renderedEvents.push(`
          <div class='github-feed__event'>
            <a href="${github.generateUrl("actor", event)}" target="_blank" rel="noopener noreferrer">
              <img src="${event.actor.avatar_url}" class="github-feed__event__avatar" alt=""/>
            </a>

            <p>
              ${github.generateEvent(event)}
              <a href="${github.generateUrl("repo", event)}" title="View this repo on GitHub" target="_blank" rel="noopener noreferrer"><strong>${event.repo.name}</strong></a>
              <em class="github-feed__event__time">${relativeDate(new Date(event.created_at))}</em>
            </p>
          </div>
        `);
      }

      // TODO: Update `.last-updated` every minute

      displayGitHubFeed(dedent`
        <h3>GitHub</h3>
        <h5 class="last-updated">Last updated: ${new Date().format("YYYY-MM-DD at H:mm:ss A").toLowerCase().replace(/-/g, "&middot;")}</h5>

        ${renderedEvents.join("")}
      `);
    });
  }
}