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extern crate modelica_parser;

use self::modelica_parser::ast::*;

pub trait TranspileJS {
    fn repr_js(&self) -> Result<String, String>;
}


impl TranspileJS for ModelicaModel {
    fn repr_js(&self) -> Result<String, String> {
        let mut constants = vec![];
        for (c, e) in self.get_constant_vars() {
            if let Some(v) = e {
                constants.push(format!("var {} = {};",
                    c, try!(v.repr_js())));
            }
        }
        let mut binds = vec![];
        let mut outputs = vec![];
        for eq in self.equations.iter() {
            if let Expr::Ident(ref symb) = eq.lhs {
                binds.push(format!("var {} = {};",
                    symb,
                    try!(eq.rhs.repr_js())));
                outputs.push(symb.to_string());
            } else {
                return Err("Expected an identifier on LHS (in this partial implementation)".to_string())
            }
        }
        Ok(format!(
        r#"function {slug}({args}) {{
                {constants}
                {binds}
                return [{outputs}];
        }}"#,
            slug = "f",
            args = self.get_free_vars().join(", "),
            constants = constants.join("\n    "),
            binds = binds.join("\n    "),
            outputs = outputs.join(", ")))
    }
}

impl TranspileJS for Expr {
    fn repr_js(&self) -> Result<String, String> {
        use modelica_parser::ast::Expr::*;
        match *self {
            Integer(e) => Ok(format!("{}", e)),
            Float(e) => Ok(format!("{}", e)),
            Ident(ref e) => Ok(format!("{}", e)),
            Der(ref e) => Ok(format!("der({})", try!(e.repr_js()))),
            Abs(ref e) => Ok(format!("abs({})", try!(e.repr_js()))),
            BinExpr(op, ref l, ref r) =>
                Ok(format!("({} {:?} {})",
                    try!(l.repr_js()),
                    op,
                    try!(r.repr_js()))),
        }
    }
}