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

#[derive(Debug, PartialEq)]
pub enum IRCCommand {
    NONE,
    NAMES,
    PRIVMSG,
    NICK,
}

impl IRCCommand {
    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,
                    });
                }
                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);
                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,
                    });
                }
                return_vec.insert(0, raw_input[0].clone());
                Ok(return_vec)
            }
        }
    }
}

#[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);
}