use std::ops::Add;
use super::super::types::Type;
use super::super::types::Type::*;
use super::super::types::Number;

impl Add for Type {
    type Output = Result<Type, String>;

    fn add(self, other: Type) -> Result<Type, String> {
        match (self, other) {
            (Bool(_), _) | (_, Bool(_)) |
            (Str(_), _) | (_, Str(_)) |
            (Operator(_), _) | (_, Operator(_)) => {
                Err("Cannot add these types".to_string())
            },
            (Number(Number::Int(i)), Number(Number::Float(f))) |
            (Number(Number::Float(f)), Number(Number::Int(i))) => {
                Ok(Number(Number::Float(f + i as f32)))
            },

            (Number(Number::Int(a)), Number(Number::Int(b))) => {
                Ok(Number(Number::Int(a + b)))
            },

            (Number(Number::Float(a)), Number(Number::Float(b))) => {
                Ok(Number(Number::Float(a + b)))
            },

            (Symbol(_), Number(_)) |
            (Number(_), Symbol(_)) |
            (Symbol(_), Symbol(_)) => Err("Not yet implemented".to_string())
        }
    }
}