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

#[derive(Debug, PartialEq)]
#[allow(non_camel_case_types)]
pub enum IRCCommand {
    NONE,
    NAMES,
    PRIVMSG,
    NICK,
    RPL_WELCOME,
    RPL_NAMREPLY,
    RPL_ENDOFNAMES,
    PING,
    PONG,
}

impl 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",
        }
    }
    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 => {
                if raw_input.len() < 2 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_two_params(raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::NICK => {
                if raw_input.len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                if raw_input[0].len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_one_param(raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::RPL_NAMREPLY => {
                if raw_input.len() < 2 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                return Ok(raw_input);
            }
            IRCCommand::RPL_ENDOFNAMES => {
                if raw_input.len() < 2 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_two_params(raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::RPL_WELCOME => {
                if raw_input.len() < 2 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_two_params(raw_input, &mut return_vec);
                Ok(return_vec)
            }
            IRCCommand::PING => {
                if raw_input.len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                if raw_input[0].len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_one_param(raw_input, &mut return_vec);
                Ok(return_vec)
            },
            IRCCommand::PONG => {
                if raw_input.len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                if raw_input[0].len() < 1 {
                    return Err(MessageError {
                        detail: MessageErrorDetails::NotEnoughParams,
                    });
                }
                IRCCommand::parse_one_param(raw_input, &mut return_vec);
                Ok(return_vec)
            },
        }
    }

    fn parse_two_params(raw_input: Vec<Vec<u8>>, return_vec: &mut Vec<Vec<u8>>) {
        return_vec.insert(0, raw_input[0].clone());
        let mut message: Vec<u8> = Vec::new();
        for (i, r) in raw_input.into_iter().enumerate() {
            if i == 1 {
                message = [message, r[1..].to_vec()].concat();
            } else if i > 1 {
                message = [message, [[32].to_vec(), r].concat()].concat();
            }
        }

        return_vec.insert(1, message);
    }
    
    fn parse_one_param(raw_input: Vec<Vec<u8>>, return_vec: &mut Vec<Vec<u8>>) {
        return_vec.insert(0, raw_input[0].clone());
    }
}

#[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,
        MessageErrorDetails::NotEnoughParams
    );
    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(), 1);
}

#[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,
        MessageErrorDetails::NotEnoughParams
    );
    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,
        MessageErrorDetails::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());
}