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

#[derive(Debug)]
pub struct Message {
    pub source: Option<String>,
    pub command: IRCCommand,
    pub params: Vec<String>,
    pub valid: bool,
    pub error: Option<MessageError>,
}

impl Message {
    pub fn parse(raw_input: Vec<u8>, source_client: Option<String>) -> Result<Self, MessageError> {
        if raw_input.len() < 1 {
            return Err(MessageError {
                detail: MessageErrorDetails::NoData,
            });
        }

        let split_message: Vec<Vec<u8>> = raw_input.into_iter().fold(Vec::new(), |mut acc, x| {
            if x == 32 || acc.is_empty() {
                acc.push(Vec::new());
            }
            if x != 32 {
                acc.last_mut().unwrap().push(x);
            }
            acc
        });

        let mut source = source_client.clone();

        let mut command_index = 0;
        if split_message[0][0] == 58 {
            command_index = 1;
            let parsed_source = match Message::parse_prefix(split_message[0].clone()) {
                Ok(x) => x,
                Err(y) => return Err(y),
            };
            source = source_client.or_else(|| Some(parsed_source));
        }

        if split_message.len() < command_index + 1 {
            return Err(MessageError {
                detail: MessageErrorDetails::NoCommand,
            });
        }

        let irc_command = match Message::parse_command(split_message[command_index].clone()) {
            Ok(x) => x,
            Err(y) => return Err(y),
        };

        Ok(Message {
            source: source,
            command: irc_command,
            valid: true,
            params: Vec::new(),
            error: None,
        })
    }

    fn parse_command(command_input: Vec<u8>) -> Result<IRCCommand, MessageError> {
        let raw_command = match String::from_utf8(command_input) {
            Ok(x) => x,
            Err(_) => {
                return Err(MessageError {
                    detail: MessageErrorDetails::FailedCommandParse,
                })
            }
        };

        match raw_command.as_str() {
            "NAMES" => return Ok(IRCCommand::NAMES),
            "NICK" => return Ok(IRCCommand::NICK),
            "PRIVMSG" => return Ok(IRCCommand::PRIVMSG),
            _ => {
                return Err(MessageError {
                    detail: MessageErrorDetails::InvalidCommand,
                })
            }
        }
    }

    fn parse_prefix(prefix_input: Vec<u8>) -> Result<String, MessageError> {
        if prefix_input.len() < 2 {
            return Err(MessageError {
                detail: MessageErrorDetails::NoClient,
            });
        }

        if prefix_input[0] == 58 {
            match String::from_utf8(prefix_input.clone().split_off(1)) {
                Ok(x) => return Ok(x),
                Err(_) => {
                    return Err(MessageError {
                        detail: MessageErrorDetails::FailedParse,
                    });
                }
            }
        } else {
            return Err(MessageError {
                detail: MessageErrorDetails::NoPrefix,
            });
        }
    }
}

#[test]
fn test_valid_command() {
    let message = "NAMES".as_bytes().to_vec();
    let command = Message::parse_command(message);
    assert_eq!(command, Ok(IRCCommand::NAMES));
}

#[test]
fn test_invalid_command() {
    let message = "NAMES2".as_bytes().to_vec();
    let command = Message::parse_command(message);
    assert!(command.is_err());
}

#[test]
fn test_blank_command() {
    let message = "".as_bytes().to_vec();
    let command = Message::parse_command(message);
    assert!(command.is_err());
}

#[test]
fn test_valid_source() {
    let message = ":TestClient".as_bytes().to_vec();
    let source = Message::parse_prefix(message);
    let source_string = match source {
        Ok(x) => x,
        Err(_) => "None".to_string(),
    };
    assert_eq!(source_string, "TestClient");
}
#[test]
fn test_invalid_source() {
    let message = ":".as_bytes().to_vec();
    let source = Message::parse_prefix(message);
    let source_string = match source {
        Ok(x) => x,
        Err(y) => y.detail.error_text().to_string(),
    };
    assert_eq!(source_string, "No client identifier");
}
#[test]
fn test_empty_source() {
    let message = Vec::new();
    let source = Message::parse_prefix(message);
    let source_string = match source {
        Ok(x) => x,
        Err(y) => y.detail.error_text().to_string(),
    };
    assert_eq!(source_string, "No client identifier");
}

#[test]
fn test_format_source() {
    let message = "TestClient".as_bytes().to_vec();
    let source = Message::parse_prefix(message);
    let source_string = match source {
        Ok(x) => x,
        Err(y) => y.detail.error_text().to_string(),
    };
    assert_eq!(source_string, "Missing : character");
}