import path from "path";
import yaml from "js-yaml";

import fs from "fs";
const fsp = fs.promises;

import { Knub, logger, PluginError, CommandArgumentTypeError, Plugin } from "knub";
import { SimpleError } from "./SimpleError";

require("dotenv").config();

let recentPluginErrors = 0;
const RECENT_ERROR_EXIT_THRESHOLD = 5;
setInterval(() => (recentPluginErrors = Math.max(0, recentPluginErrors - 1)), 2500);

process.on("unhandledRejection", (reason, p) => {
  console.error(reason);

  if (reason instanceof PluginError) {
    if (++recentPluginErrors >= RECENT_ERROR_EXIT_THRESHOLD) process.exit(1);
  } else {
    process.exit(1);
  }
});

process.on("uncaughtException", err => {
  console.error(err);

  if (err instanceof PluginError) {
    if (++recentPluginErrors >= RECENT_ERROR_EXIT_THRESHOLD) process.exit(1);
  } else {
    process.exit(1);
  }
});

// Verify required Node.js version
const REQUIRED_NODE_VERSION = "10.14.2";
const requiredParts = REQUIRED_NODE_VERSION.split(".").map(v => parseInt(v, 10));
const actualVersionParts = process.versions.node.split(".").map(v => parseInt(v, 10));
for (const [i, part] of actualVersionParts.entries()) {
  if (part > requiredParts[i]) break;
  if (part === requiredParts[i]) continue;
  throw new SimpleError(`Unsupported Node.js version! Must be at least ${REQUIRED_NODE_VERSION}`);
}

// Always use UTC
import moment from "moment-timezone";
moment.tz.setDefault("UTC");

import { Client } from "eris";
import { connect } from "./data/db";

// Global plugins
import { BotControlPlugin } from "./plugins/BotControl";
import { LogServerPlugin } from "./plugins/LogServer";

// Guild plugins
import { ModActionsPlugin } from "./plugins/ModActions";
import { UtilityPlugin } from "./plugins/Utility";
import { LogsPlugin } from "./plugins/Logs";
import { PostPlugin } from "./plugins/Post";
import { ReactionRolesPlugin } from "./plugins/ReactionRoles";
import { CensorPlugin } from "./plugins/Censor";
import { PersistPlugin } from "./plugins/Persist";
import { SpamPlugin } from "./plugins/Spam";
import { TagsPlugin } from "./plugins/Tags";
import { MessageSaverPlugin } from "./plugins/MessageSaver";
import { CasesPlugin } from "./plugins/Cases";
import { MutesPlugin } from "./plugins/Mutes";
import { SlowmodePlugin } from "./plugins/Slowmode";
import { StarboardPlugin } from "./plugins/Starboard";
import { NameHistoryPlugin } from "./plugins/NameHistory";
import { AutoReactionsPlugin } from "./plugins/AutoReactionsPlugin";
import { PingableRolesPlugin } from "./plugins/PingableRolesPlugin";
import { SelfGrantableRolesPlugin } from "./plugins/SelfGrantableRolesPlugin";
import { RemindersPlugin } from "./plugins/Reminders";
import { convertDelayStringToMS, errorMessage, successMessage } from "./utils";
import { ZeppelinPlugin } from "./plugins/ZeppelinPlugin";

// Run latest database migrations
logger.info("Running database migrations");
connect().then(async conn => {
  await conn.runMigrations();

  const client = new Client(`Bot ${process.env.TOKEN}`, {
    getAllUsers: true,
    restMode: true,
  });
  client.setMaxListeners(100);

  client.on("debug", message => {
    if (message.includes(" 429 ")) {
      logger.info(`[RATELIMITED] ${message}`);
    }
  });

  const basePlugins = ["message_saver", "name_history", "cases", "mutes"];

  const bot = new Knub(client, {
    plugins: [
      // Base plugins (always enabled)
      MessageSaverPlugin,
      NameHistoryPlugin,
      CasesPlugin,
      MutesPlugin,

      // Regular plugins
      UtilityPlugin,
      ModActionsPlugin,
      LogsPlugin,
      PostPlugin,
      ReactionRolesPlugin,
      CensorPlugin,
      PersistPlugin,
      SpamPlugin,
      TagsPlugin,
      SlowmodePlugin,
      StarboardPlugin,
      AutoReactionsPlugin,
      PingableRolesPlugin,
      SelfGrantableRolesPlugin,
      RemindersPlugin,
    ],

    globalPlugins: [BotControlPlugin, LogServerPlugin],

    options: {
      getEnabledPlugins(guildId, guildConfig): string[] {
        const configuredPlugins = guildConfig.plugins || {};
        const pluginNames: string[] = Array.from(this.plugins.keys());
        const plugins: Array<typeof Plugin> = Array.from(this.plugins.values());
        const zeppelinPlugins: Array<typeof ZeppelinPlugin> = plugins.filter(
          p => p.prototype instanceof ZeppelinPlugin,
        ) as Array<typeof ZeppelinPlugin>;

        const enabledBasePlugins = pluginNames.filter(n => basePlugins.includes(n));
        const explicitlyEnabledPlugins = pluginNames.filter(pluginName => {
          return configuredPlugins[pluginName] && configuredPlugins[pluginName].enabled !== false;
        });
        const enabledPlugins = new Set([...enabledBasePlugins, ...explicitlyEnabledPlugins]);

        const pluginsEnabledAsDependencies = zeppelinPlugins.reduce((arr, pluginClass) => {
          if (!enabledPlugins.has(pluginClass.pluginName)) return arr;
          return arr.concat(pluginClass.dependencies);
        }, []);

        const finalEnabledPlugins = new Set([
          ...basePlugins,
          ...pluginsEnabledAsDependencies,
          ...explicitlyEnabledPlugins,
        ]);
        return Array.from(finalEnabledPlugins.values());
      },

      async getConfig(id) {
        const configFile = id ? `${id}.yml` : "global.yml";
        const configPath = path.join("config", configFile);

        try {
          await fsp.access(configPath);
        } catch (e) {
          return {};
        }

        const yamlString = await fsp.readFile(configPath, { encoding: "utf8" });
        return yaml.safeLoad(yamlString);
      },

      logFn: (level, msg) => {
        if (level === "debug") return;
        const ts = moment().format("YYYY-MM-DD HH:mm:ss");
        console.log(`[${ts}] [${level.toUpperCase()}] ${msg}`);
      },

      performanceDebug: {
        enabled: true,
        size: 30,
        threshold: 200,
      },

      customArgumentTypes: {
        delay(value) {
          const result = convertDelayStringToMS(value);
          if (result == null) {
            throw new CommandArgumentTypeError(`Could not convert ${value} to a delay`);
          }

          return result;
        },
      },

      sendSuccessMessageFn(channel, body) {
        channel.createMessage(successMessage(body));
      },

      sendErrorMessageFn(channel, body) {
        channel.createMessage(errorMessage(body));
      },
    },
  });

  logger.info("Starting the bot");
  bot.run();
});