use crate::*;
use ConnectName::*;
use ConnectScope::*;
use ConnectStatus::*;

#[derive(Clone, Debug, PartialEq)] pub enum ConnectName {
    /** Exact match */
    Exact(Arc<str>),
    /** Match regular expression */
    RegExp(Arc<str>),
}

#[derive(Clone, Copy, Debug, PartialEq)] pub enum ConnectScope {
    One,
    All
}

#[derive(Clone, Copy, Debug, PartialEq)] pub enum ConnectStatus {
    Missing,
    Disconnected,
    Connected,
    Mismatch,
}

/// Port connection manager.
///
/// ```
/// let connect = tek::Connect::default();
/// ```
#[derive(Clone, Debug, Default)] pub struct Connect {
    pub name:   Option<ConnectName>,
    pub scope:  Option<ConnectScope>,
    pub status: Arc<RwLock<Vec<(Port<Unowned>, Arc<str>, ConnectStatus)>>>,
    pub info:   Arc<str>,
}

impl Connect {
    pub fn collect (exact: &[impl AsRef<str>], re: &[impl AsRef<str>], re_all: &[impl AsRef<str>])
        -> Vec<Self>
    {
        let mut connections = vec![];
        for port in exact.iter()  { connections.push(Self::exact(port)) }
        for port in re.iter()     { connections.push(Self::regexp(port)) }
        for port in re_all.iter() { connections.push(Self::regexp_all(port)) }
        connections
    }
    /// Connect to this exact port
    pub fn exact (name: impl AsRef<str>) -> Self {
        let info = format!("=:{}", name.as_ref()).into();
        let name = Some(Exact(name.as_ref().into()));
        Self { name, scope: Some(One), status: Arc::new(RwLock::new(vec![])), info }
    }
    pub fn regexp (name: impl AsRef<str>) -> Self {
        let info = format!("~:{}", name.as_ref()).into();
        let name = Some(RegExp(name.as_ref().into()));
        Self { name, scope: Some(One), status: Arc::new(RwLock::new(vec![])), info }
    }
    pub fn regexp_all (name: impl AsRef<str>) -> Self {
        let info = format!("+:{}", name.as_ref()).into();
        let name = Some(RegExp(name.as_ref().into()));
        Self { name, scope: Some(All), status: Arc::new(RwLock::new(vec![])), info }
    }
    pub fn info (&self) -> Arc<str> {
        format!(" ({}) {} {}", {
            let status = self.status.read().unwrap();
            let mut ok = 0;
            for (_, _, state) in status.iter() {
                if *state == Connected {
                    ok += 1
                }
            }
            format!("{ok}/{}", status.len())
        }, match self.scope {
            None      => "x",
            Some(One) => " ",
            Some(All) => "*",
        }, match &self.name {
            None               => format!("x"),
            Some(Exact(name))  => format!("= {name}"),
            Some(RegExp(name)) => format!("~ {name}"),
        }).into()
    }
}