use crate::error::{MessageError, MessageErrorDetails::*};

#[derive(Debug, PartialEq)]
#[allow(non_camel_case_types)]
pub enum IRCCommand {
    NONE,
    NAMES,
    PRIVMSG,
    NOTICE,
    NICK,
    USER,
    QUIT,
    MOTD,
    LUSERS,
    WHOIS,
    TOPIC,
    RPL_WELCOME,
    RPL_YOURHOST,
    RPL_CREATED,
    RPL_MYINFO,
    RPL_NAMREPLY,
    RPL_ENDOFNAMES,
    RPL_LUSERCLIENT,
    RPL_LUSEROP,
    RPL_LUSERUNKNOWN,
    RPL_LUSERCHANNELS,
    RPL_LUSERME,
    RPL_WHOISUSER,
    RPL_WHOISSERVER,
    RPL_ENDOFWHOIS,
    PING,
    PONG,
    ERR_NONICKNAMEGIVEN,
    ERR_NICKNAMEINUSE,
    ERR_ALREADYREGISTRED,
    ERR_NEEDMOREPARAMS,
    ERR_NOTREGISTERED,
    ERR_UNKNOWNCOMMAND,
    ERR_NORECIPIENT,
    ERR_NOTEXTTOSEND,
    ERR_NOSUCHNICK,
    ERR_NOMOTD,
}

impl IRCCommand {
    /// Returns a reference to the command text of this [`IRCCommand`].
    pub fn command_text(&self) -> &str {
        match *self {
            IRCCommand::NONE => "NONE",
            IRCCommand::NAMES => "NAMES",
            IRCCommand::PRIVMSG => "PRIVMSG",
            IRCCommand::NICK => "NICK",
            IRCCommand::RPL_NAMREPLY => "353",
            IRCCommand::RPL_ENDOFNAMES => "366",
            IRCCommand::RPL_WELCOME => "001",
            IRCCommand::PING => "PING",
            IRCCommand::PONG => "PONG",
            IRCCommand::USER => "USER",
            IRCCommand::QUIT => "QUIT",
            IRCCommand::NOTICE => "NOTICE",
            IRCCommand::MOTD => "MOTD",
            IRCCommand::LUSERS => "LUSERS",
            IRCCommand::WHOIS => "WHOIS",
            IRCCommand::RPL_YOURHOST => "002",
            IRCCommand::RPL_CREATED => "003",
            IRCCommand::RPL_MYINFO => "004",
            IRCCommand::RPL_LUSERCLIENT => "251",
            IRCCommand::RPL_LUSEROP => "252",
            IRCCommand::RPL_LUSERUNKNOWN => "253",
            IRCCommand::RPL_LUSERCHANNELS => "254",
            IRCCommand::RPL_LUSERME => "255",
            IRCCommand::RPL_WHOISUSER => "311",
            IRCCommand::RPL_WHOISSERVER => "312",
            IRCCommand::RPL_ENDOFWHOIS => "318",
            IRCCommand::ERR_NONICKNAMEGIVEN => "431",
            IRCCommand::ERR_NICKNAMEINUSE => "433",
            IRCCommand::ERR_ALREADYREGISTRED => "462",
            IRCCommand::ERR_NEEDMOREPARAMS => "461",
            IRCCommand::ERR_NOTREGISTERED => "451",
            IRCCommand::ERR_UNKNOWNCOMMAND => "421",
            IRCCommand::ERR_NORECIPIENT => "411",
            IRCCommand::ERR_NOTEXTTOSEND => "412",
            IRCCommand::ERR_NOSUCHNICK => "401",
            IRCCommand::ERR_NOMOTD => "422",
            IRCCommand::TOPIC => "TOPIC",
        }
    }

    pub fn text_command(text: &str) -> IRCCommand {
        match text {
            "NAMES" => return IRCCommand::NAMES,
            "NICK" => return IRCCommand::NICK,
            "PRIVMSG" => return IRCCommand::PRIVMSG,
            "001" => return IRCCommand::RPL_WELCOME,
            "353" => return IRCCommand::RPL_NAMREPLY,
            "366" => return IRCCommand::RPL_ENDOFNAMES,
            "PING" => return IRCCommand::PING,
            "PONG" => return IRCCommand::PONG,
            "USER" => return IRCCommand::USER,
            "QUIT" => return IRCCommand::QUIT,
            "NOTICE" => return IRCCommand::NOTICE,
            "MOTD" => return IRCCommand::MOTD,
            "LUSERS" => return IRCCommand::LUSERS,
            "WHOIS" => return IRCCommand::WHOIS,
            "TOPIC" => return IRCCommand::TOPIC,
            "002" => return IRCCommand::RPL_YOURHOST,
            "003" => return IRCCommand::RPL_CREATED,
            "004" => return IRCCommand::RPL_MYINFO,
            "251" => return IRCCommand::RPL_LUSERCLIENT,
            "252" => return IRCCommand::RPL_LUSEROP,
            "253" => return IRCCommand::RPL_LUSERUNKNOWN,
            "254" => return IRCCommand::RPL_LUSERCHANNELS,
            "255" => return IRCCommand::RPL_LUSERME,
            "311" => return IRCCommand::RPL_WHOISUSER,
            "312" => return IRCCommand::RPL_WHOISSERVER,
            "318" => return IRCCommand::RPL_ENDOFWHOIS,
            "431" => return IRCCommand::ERR_NONICKNAMEGIVEN,
            "433" => return IRCCommand::ERR_NICKNAMEINUSE,
            "462" => return IRCCommand::ERR_ALREADYREGISTRED,
            "461" => return IRCCommand::ERR_NEEDMOREPARAMS,
            "451" => return IRCCommand::ERR_NOTREGISTERED,
            "421" => return IRCCommand::ERR_UNKNOWNCOMMAND,
            "411" => return IRCCommand::ERR_NORECIPIENT,
            "412" => return IRCCommand::ERR_NOTEXTTOSEND,
            "401" => return IRCCommand::ERR_NOSUCHNICK,
            "422" => return IRCCommand::ERR_NOMOTD,
            _ => return IRCCommand::NONE,
        }
    }

    pub fn params_before_colon(&self) -> usize {
        match *self {
            IRCCommand::PRIVMSG => 1,
            IRCCommand::USER => 3,
            IRCCommand::TOPIC => 1,
            _ => 0,
        }
    }

    /// From a vector of u8 vectors, each entry representing the space (32) seperated values following the IRCCommand, will return a similar list of parameters. If a : (58) is encountered at the start of an entry all remaining values are concatenated with a space (32)
    ///
    /// # Errors
    ///
    /// This function will return an error if .
    pub fn parse_params(&self, raw_input: Vec<Vec<u8>>) -> Result<Vec<Vec<u8>>, MessageError> {
        let mut return_vec: Vec<Vec<u8>> = Vec::new();
        match *self {
            IRCCommand::NONE => Ok(Vec::new()),
            IRCCommand::NAMES => Ok(Vec::new()),
            IRCCommand::PRIVMSG => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::NICK => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::RPL_NAMREPLY => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_ENDOFNAMES => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_WELCOME => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::PING => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::PONG => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::USER => IRCCommand::number_and_presence(&raw_input, 4),
            IRCCommand::QUIT => {
                IRCCommand::parse_irc_params(&raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::NOTICE => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::MOTD => {
                IRCCommand::parse_irc_params(&raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::LUSERS => {
                IRCCommand::parse_irc_params(&raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::WHOIS => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::RPL_YOURHOST => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_CREATED => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_MYINFO => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_LUSERCLIENT => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::RPL_LUSEROP => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::RPL_LUSERUNKNOWN => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::RPL_LUSERCHANNELS => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::RPL_LUSERME => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::RPL_WHOISUSER => IRCCommand::number_and_presence(&raw_input, 6),
            IRCCommand::RPL_WHOISSERVER => IRCCommand::number_and_presence(&raw_input, 4),
            IRCCommand::RPL_ENDOFWHOIS => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::ERR_NONICKNAMEGIVEN => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::ERR_NICKNAMEINUSE => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::ERR_ALREADYREGISTRED => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::ERR_NEEDMOREPARAMS => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::ERR_NOTREGISTERED => IRCCommand::number_and_presence(&raw_input, 1),
            IRCCommand::ERR_UNKNOWNCOMMAND => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::ERR_NORECIPIENT => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::ERR_NOTEXTTOSEND => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::ERR_NOSUCHNICK => IRCCommand::number_and_presence(&raw_input, 3),
            IRCCommand::ERR_NOMOTD => IRCCommand::number_and_presence(&raw_input, 2),
            IRCCommand::TOPIC => IRCCommand::parse_topic(&raw_input),
        }
    }

    fn parse_topic(params: &Vec<Vec<u8>>) -> Result<Vec<Vec<u8>>, MessageError> {
        if params.len() < 1 {
            return Err(MessageError {
                detail: NotEnoughParams,
            });
        }
        let mut return_vec: Vec<Vec<u8>> = Vec::new();
        IRCCommand::parse_irc_params(&params, &mut return_vec);
        Ok(return_vec)
    }

    fn number_and_presence(
        params: &Vec<Vec<u8>>,
        number: usize,
    ) -> Result<Vec<Vec<u8>>, MessageError> {
        let mut return_vec: Vec<Vec<u8>> = Vec::new();
        if !IRCCommand::validate_param_presence(&params) {
            return Err(MessageError {
                detail: BlankParams,
            });
        }
        if params.len() < number {
            return Err(MessageError {
                detail: NotEnoughParams,
            });
        }
        IRCCommand::parse_irc_params(&params, &mut return_vec);
        Ok(return_vec)
    }

    fn validate_param_presence(params: &Vec<Vec<u8>>) -> bool {
        for p in params {
            if p.len() < 1 {
                return false;
            }
        }
        true
    }

    fn parse_irc_params(raw_input: &Vec<Vec<u8>>, return_vec: &mut Vec<Vec<u8>>) {
        for (i, r) in raw_input.into_iter().enumerate() {
            if r[0] != 58 {
                return_vec.push(r.to_vec());
            } else {
                let rest = raw_input.clone().split_off(i);
                let mut message: Vec<u8> = Vec::new();
                for (j, s) in rest.into_iter().enumerate() {
                    if j == 0 {
                        message = [message, s[1..].to_vec()].concat();
                    } else {
                        message = [message, [[32].to_vec(), s].concat()].concat();
                    }
                }
                return_vec.push(message);
                return;
            }
        }
    }
}

#[test]
fn test_no_params() {
    let command_params = vec!["".as_bytes().to_vec()];
    let res = IRCCommand::NAMES.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.ok().unwrap().len(), 0);
    let command_params = vec!["abc".as_bytes().to_vec()];
    let res = IRCCommand::NAMES.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.ok().unwrap().len(), 0);
    let command_params = vec!["abc :Hello".as_bytes().to_vec()];
    let res = IRCCommand::NAMES.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.ok().unwrap().len(), 0);
}

#[test]
fn test_one_param() {
    let command_params = vec!["".as_bytes().to_vec()];
    let res = IRCCommand::NICK.parse_params(command_params);
    assert!(res.is_err());
    assert_eq!(res.err().unwrap().detail, BlankParams);
    let command_params = vec!["Anon".as_bytes().to_vec()];
    let res = IRCCommand::NICK.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.ok().unwrap()[0][0], 65);
    let command_params = vec!["Anon".as_bytes().to_vec(), "B".as_bytes().to_vec()];
    let res = IRCCommand::NICK.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.ok().unwrap().len(), 2);
}

#[test]
fn test_message_param() {
    let command_params = vec!["".as_bytes().to_vec()];
    let res = IRCCommand::PRIVMSG.parse_params(command_params);
    assert!(res.is_err());
    assert_eq!(res.err().unwrap().detail, BlankParams);
    let command_params = vec!["Anon".as_bytes().to_vec()];
    let res = IRCCommand::PRIVMSG.parse_params(command_params);
    assert!(res.is_err());
    assert_eq!(res.err().unwrap().detail, NotEnoughParams);
    let command_params = vec![
        "Anon".as_bytes().to_vec(),
        ":Hello".as_bytes().to_vec(),
        "anon".as_bytes().to_vec(),
    ];
    let res = IRCCommand::PRIVMSG.parse_params(command_params);
    assert!(res.is_ok());
    assert_eq!(res.as_ref().ok().unwrap().len(), 2);
    assert_eq!(res.as_ref().ok().unwrap()[1][0], 72);
}

#[test]
fn test_welcome() {
    let raw_input = vec![
        "Anon".as_bytes().to_vec(),
        ":Welcome".as_bytes().to_vec(),
        "to".as_bytes().to_vec(),
        "the".as_bytes().to_vec(),
        "server".as_bytes().to_vec(),
    ];
    let res = IRCCommand::RPL_WELCOME.parse_params(raw_input);
    println!("{:?}", res);
    assert!(res.is_ok());
    assert_eq!(res.as_ref().unwrap().len(), 2);
    assert_eq!(res.as_ref().unwrap()[1].len(), 21);
    let raw_input = vec!["Anon".as_bytes().to_vec()];
    let res = IRCCommand::RPL_WELCOME.parse_params(raw_input);
    println!("{:?}", res);
    assert!(res.is_err());
}