import pm2 from "pm2";
import { Api } from "@top-gg/sdk";
import winston from "winston";

// load config from .env file
import { resolve, dirname } from "path";
import { fileURLToPath } from "url";
import { readFileSync } from "fs";
import { createServer } from "http";
import { config } from "dotenv";
config({ path: resolve(dirname(fileURLToPath(import.meta.url)), "../../.env") });

import database from "../database.js";

const dbl = process.env.NODE_ENV === "production" && process.env.DBL ? new Api(process.env.DBL) : null;

const logger = winston.createLogger({
  levels: {
    error: 0,
    warn: 1,
    info: 2,
    main: 3,
    debug: 4
  },
  transports: [
    new winston.transports.Console({ format: winston.format.colorize({ all: true }), stderrLevels: ["error", "warn"] })
  ],
  level: process.env.DEBUG_LOG ? "debug" : "main",
  format: winston.format.combine(
    winston.format.timestamp({ format: "YYYY-MM-DD HH:mm:ss" }),
    winston.format.printf((info) => {
      const {
        timestamp, level, message, ...args
      } = info;

      return `[${timestamp}]: [${level.toUpperCase()}] - ${message} ${Object.keys(args).length ? JSON.stringify(args, null, 2) : ""}`;
    }),
  )
});

winston.addColors({
  info: "green",
  main: "gray",
  debug: "magenta",
  warn: "yellow",
  error: "red"
});

let serverCount = 0;
let shardCount = 0;
let clusterCount = 0;
let responseCount = 0;

let timeout;

process.on("message", (packet) => {
  if (packet.data?.type === "getCount") {
    process.send({
      type: "process:msg",
      data: {
        type: "countResponse",
        serverCount
      }
    });
  }
});

function updateStats() {
  serverCount = 0;
  shardCount = 0;
  clusterCount = 0;
  responseCount = 0;
  return new Promise((resolve, reject) => {
    pm2.list((err, list) => {
      if (err) reject(err);
      const clusters = list.filter((v) => v.name === "esmBot");
      clusterCount = clusters.length;
      const listener = (packet) => {
        if (packet.data?.type === "serverCounts") {
          clearTimeout(timeout);
          serverCount += packet.data.guilds;
          shardCount += packet.data.shards;
          responseCount += 1;
          if (responseCount >= clusterCount) {
            resolve();
            process.removeListener("message", listener);
          } else {
            timeout = setTimeout(() => {
              reject();
              process.removeListener("message", listener);
            }, 5000);
          }
        }
      };
      timeout = setTimeout(() => {
        reject();
        process.removeListener("message", listener);
      }, 5000);
      process.on("message", listener);
      process.send({
        type: "process:msg",
        data: {
          type: "serverCounts"
        }
      });
    });
  });
}

async function dblPost() {
  logger.main("Posting stats to Top.gg...");
  try {
    //await updateStats();
    await dbl.postStats({
      serverCount,
      shardCount
    });
    logger.main("Stats posted.");
  } catch (e) {
    logger.error(e);
  }
}

if (process.env.METRICS && process.env.METRICS !== "") {
  const servers = [];
  if (process.env.API_TYPE === "ws") {
    const imageHosts = JSON.parse(readFileSync(new URL("../../config/servers.json", import.meta.url), { encoding: "utf8" })).image;
    for (let { server } of imageHosts) {
      if (!server.includes(":")) {
        server += ":3762";
      }
      servers.push(server);
    }
  }
  const httpServer = createServer(async (req, res) => {
    if (req.method !== "GET") {
      res.statusCode = 405;
      return res.end("GET only");
    }
    res.write(`# HELP esmbot_command_count Number of times a command has been run
# TYPE esmbot_command_count counter
# HELP esmbot_server_count Number of servers/guilds the bot is in
# TYPE esmbot_server_count gauge
# HELP esmbot_shard_count Number of shards the bot has
# TYPE esmbot_shard_count gauge
`);
    const counts = await database.getCounts();
    for (const [i, w] of Object.entries(counts)) {
      res.write(`esmbot_command_count{command="${i}"} ${w}\n`);
    }

    res.write(`esmbot_server_count ${serverCount}\n`);
    res.write(`esmbot_shard_count ${shardCount}\n`);
    res.end();
  });
  httpServer.listen(process.env.METRICS, () => {
    logger.log("info", `Serving metrics at ${process.env.METRICS}`);
  });
}

setInterval(updateStats, 300000);
if (dbl) setInterval(dblPost, 1800000);

setTimeout(updateStats, 10000);

logger.info("Started esmBot management process.");