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use crate::UltrarouteError;
use std::convert::TryFrom;
use std::hash::{Hash, Hasher};

static PREFIXES: [char; 2] = ['!', '/']; // TODO: possibility to define it

#[inline(always)]
fn unprefix_and_lowercase(mut input: String) -> String {
    if input
        .chars()
        .next()
        .map(|chr| PREFIXES.contains(&chr))
        .unwrap_or(false)
    {
        input.remove(0);
        input.to_lowercase()
    } else {
        input.to_lowercase()
    }
}

#[derive(Debug, Clone)]
pub struct Command {
    pub cmd: String,
    pub args: Vec<String>,
    pub args_count: u8,
}

impl Command {
    // it's any case by default
    #[inline]
    pub fn new(initial: String) -> Result<Self, UltrarouteError> {
        let initial = unprefix_and_lowercase(initial);
        let mut parts: Vec<String> = initial
            .trim()
            .split_ascii_whitespace()
            .map(|s| s.to_string())
            .collect();
        if parts.len() < 1 {
            return Err(UltrarouteError::StringIsEmpty);
        }
        let cmd = parts.remove(0);
        let args_count = parts.len() as u8;
        Ok(Self {
            cmd,
            args: parts,
            args_count,
        })
    }
}

impl TryFrom<String> for Command {
    type Error = UltrarouteError;
    fn try_from(string: String) -> Result<Self, UltrarouteError> {
        Self::new(string)
    }
}

impl TryFrom<&str> for Command {
    type Error = UltrarouteError;
    fn try_from(string: &str) -> Result<Self, UltrarouteError> {
        Self::new(string.to_string())
    }
}

#[macro_export]
// create command or panic
macro_rules! create_command {
    ($command:expr) => {{
        use std::convert::TryFrom;
        match Command::try_from($command) {
            Ok(ok) => ok,
            Err(e) => panic!("{}", e),
        }
    }};
}

impl PartialEq for Command {
    fn eq(&self, other: &Self) -> bool {
        self.cmd == other.cmd && self.args_count == other.args_count
    }
}
impl Eq for Command {}

impl Hash for Command {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.cmd.hash(state);
        self.args_count.hash(state);
    }
}