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use crate::{generate::*, type_info::*};
use std::fmt;

/// Definition of `__new__` method.
#[derive(Debug, Clone, PartialEq)]
pub struct NewDef {
    pub args: Vec<Arg>,
    pub signature: Option<&'static str>,
}

impl Import for NewDef {
    fn import(&self) -> HashSet<ModuleRef> {
        let mut import = HashSet::new();
        for arg in &self.args {
            import.extend(arg.import().into_iter());
        }
        import
    }
}

impl From<&NewInfo> for NewDef {
    fn from(info: &NewInfo) -> Self {
        Self {
            args: info.args.iter().map(Arg::from).collect(),
            signature: info.signature,
        }
    }
}

impl fmt::Display for NewDef {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let indent = indent();
        write!(f, "{indent}def __new__(cls,")?;
        if let Some(signature) = self.signature {
            let joined = signature.replace('\n', " ");
            write!(f, "{}", joined)?;
        } else {
            for (n, arg) in self.args.iter().enumerate() {
                write!(f, "{}", arg)?;
                if n != self.args.len() - 1 {
                    write!(f, ", ")?;
                }
            }
        }
        writeln!(f, "): ...")?;
        Ok(())
    }
}