"use strict";

// Load up libraries
const Discord = require("discord.js");
// Load config!
let config = require("config");
config = config.get("bot");

var aliases;
try {
  aliases = require("./alias.json");
} catch (e) {
  //No aliases defined
  aliases = {
    test: {
      process: function(bot, msg) {
        msg.channel.send("test");
      }
    }
  };
}
var commands = {
  ping: {
    description: "responds pong, useful for checking if bot is alive",
    process: async function(bot, msg, suffix) {
      let m = await msg.channel.send(msg.author + " Ping?");
      m.edit(
        `Pong! Latency is ${m.createdTimestamp -
          msg.createdTimestamp}ms. API Latency is ${Math.round(bot.ping)}ms`
      );
      if (suffix) {
        msg.channel.send("note that !ping takes no arguments!");
      }
    }
  }
};

var bot = new Discord.Client();

bot.on("ready", function() {
  console.log(
    "Logged in! Serving in " + bot.guilds.array().length + " servers"
  );
  require("./plugins.js").init();
  console.log("type " + config.prefix + "help in Discord for a commands list.");
  bot.user.setGame(config.prefix + "help | Tipping not available");
});

bot.on("disconnected", function() {
  console.log("Disconnected!");
  process.exit(1); //exit node.js with an error
});

function checkMessageForCommand(msg, isEdit) {
  //check if message is a command
  if (msg.author.id != bot.user.id && msg.content.startsWith(config.prefix)) {
    console.log(
      "treating " +
        msg.content +
        " from UserID:" +
        msg.author +
        " || UserName: " +
        msg.author.username +
        " as command"
    );
    var cmdTxt = msg.content.split(" ")[0].substring(config.prefix.length);
    var suffix = msg.content.substring(
      cmdTxt.length + config.prefix.length + 1
    ); //add one for the ! and one for the space
    if (msg.isMentioned(bot.user)) {
      try {
        cmdTxt = msg.content.split(" ")[1];
        suffix = msg.content.substring(
          bot.user.mention().length + cmdTxt.length + config.prefix.length + 1
        );
      } catch (e) {
        //no command
        msg.channel.send("Yes?");
        return;
      }
    }
    let alias = aliases[cmdTxt];
    if (alias) {
      var cmd = alias;
    } else {
      var cmd = commands[cmdTxt];
    }
    if (cmdTxt === "help") {
      //help is special since it iterates over the other commands
      if (suffix) {
        var cmds = suffix.split(" ").filter(function(cmd) {
          return commands[cmd];
        });
        var info = "";
        for (var i = 0; i < cmds.length; i++) {
          var cmd = cmds[i];
          info += "**" + config.prefix + cmd + "**";
          var usage = commands[cmd].usage;
          if (usage) {
            info += " " + usage;
          }
          var description = commands[cmd].description;
          if (description instanceof Function) {
            description = description();
          }
          if (description) {
            info += "\n\t" + description;
          }
          info += "\n";
        }
        msg.channel.send(info);
      } else {
        msg.author.send("**Available Commands:**").then(function() {
          var batch = "";
          var sortedCommands = Object.keys(commands).sort();
          for (var i in sortedCommands) {
            var cmd = sortedCommands[i];
            var info = "**" + config.prefix + cmd + "**";
            var usage = commands[cmd].usage;
            if (usage) {
              info += " " + usage;
            }
            var description = commands[cmd].description;
            if (description instanceof Function) {
              description = description();
            }
            if (description) {
              info += "\n\t" + description;
            }
            var newBatch = batch + "\n" + info;
            if (newBatch.length > 1024 - 8) {
              //limit message length
              msg.author.send(batch);
              batch = info;
            } else {
              batch = newBatch;
            }
          }
          if (batch.length > 0) {
            msg.author.send(batch);
          }
        });
      }
    } else if (cmd) {
      // Add permission check here later on ;)
      try {
        cmd.process(bot, msg, suffix, isEdit);
      } catch (e) {
        var msgTxt = "command " + cmdTxt + " failed :(";
        if (config.debug) {
          msgTxt += "\n" + e.stack;
        }
        msg.channel.send(msgTxt);
      }
    } else {
      msg.channel
        .send(cmdTxt + " not recognized as a command!")
        .then(message => message.delete(10000));
    }
  } else {
    //message isn't a command or is from us
    //drop our own messages to prevent feedback loops
    if (msg.author == bot.user) {
      return;
    }

    if (msg.author != bot.user && msg.isMentioned(bot.user)) {
      msg.channel.send("yes?"); //using a mention here can lead to looping
    } else {
    }
  }
}

bot.on("message", msg => checkMessageForCommand(msg, false));
bot.on("messageUpdate", (oldMessage, newMessage) => {
  checkMessageForCommand(newMessage, true);
});

exports.addCommand = function(commandName, commandObject) {
  try {
    commands[commandName] = commandObject;
  } catch (err) {
    console.log(err);
  }
};
exports.addCustomFunc = function(customFunc) {
  try {
    customFunc(bot);
  } catch (err) {
    console.log(err);
  }
};
exports.commandCount = function() {
  return Object.keys(commands).length;
};

bot.login(config.token);