package main

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"net"
	"strings"
)

var nick = "pathbbot"

func sendData(conn net.Conn, message string) {
	fmt.Fprintf(conn, "%s\n", message)
}

func logon(conn net.Conn) {
	sendData(conn, "NICK "+nick)
	sendData(conn, "User inhabitant 8 * : pathbwalker")
}

func sendPong(conn net.Conn, ping string) {
	sendData(conn, strings.Replace(ping, "PING", "PONG", 1))
}

func join(conn net.Conn) {
	sendData(conn, "JOIN #pathb")
}

func main() {
	conn, err := net.Dial("tcp", "irc.anarchyplanet.org:6667")
	if err != nil {
		log.Print(err)
	}

	reader := bufio.NewReader(conn)

	logon(conn)
	for {
		ln, err := reader.ReadString('\n')
		fmt.Print(ln)

		var _, command, _, message = parseIRCMessage(ln)

		switch err {
		case io.EOF:
			log.Println("Reached EOF - closing this connection.\n")
			return
		case nil: // Do nothing
			break
		default:
			log.Println("error.\n")
			return
		}

		switch {
		case command == "PING":
			sendPong(conn, ln)
		case command == "001":
			join(conn)
		case command == "PRIVMSG" && message == "@arise":
			sendData(conn, "PRIVMSG #pathb :What the fuck did you just fucking say about me, you little bitch? I'll have you know I graduated top of my class in the Navy Seals, and I've been involved in numerous secret raids on Al-Quaeda, and I have over 300 confirmed kills. I am trained in gorilla warfare and I'm the top sniper in the entire US armed forces. You are nothing to me but just another target. I will wipe you the fuck out with precision the likes of which has never been seen before on this Earth, mark my fucking words.")
		}

	}
}

/***
 * Parses a recieved IRC message into its components.
 *
 * Returns:
 * prefix string - optional prefix, empty string if not
 * command string - command
 * params []string - params, separated into a slice. If final param form is present,
 *		it is returned with its preceeding ':'
 * text string - if final param form is present, return final param string without
 *		preceeding ':'
 */
func parseIRCMessage(message string) (prefix, command string, params []string, text string) {
	var lineReader = bufio.NewReader(strings.NewReader(strings.Trim(message, "\n")))

	// Optionally scan prefix into prefix
	if message[0] == ':' {
		fmt.Fscanf(lineReader, ":%s ", &prefix)
	}

	// Scan first non prefix string into command
	fmt.Fscanf(lineReader, "%s ", &command)

	// Scan rest of line into args
	for lineReader.Buffered() > 0 {

		var param string

		// Peek the first character, if it's a ':' this is the last parameter,
		// which includes spaces
		if char, _ := lineReader.Peek(1); char[0] == ':' {
			var paramBytes, _ = io.ReadAll(lineReader)
			param = string(paramBytes)

			// Text is defined as the last parameter sans ':', if the special
			// Last parameter exists
			text = strings.TrimPrefix(param, ":")
		} else {
			var paramBytes, _ = lineReader.ReadString(' ')
			param = string(paramBytes)
		}

		params = append(params, param)
	}

	return prefix, command, params, text
}