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#![allow(clippy::should_implement_trait)] // TODO

use {
	super::ValueCore,
	crate::{Convert, ConvertFrom, Result, Value, ValueError},
};

// These were using references, they now consume their variables. See ::recipe.
macro_rules! natural_binary_op {
    ($name: ident, $trait: ident, $op: tt) => {
        pub fn $name<Core>(self, other: Self) -> Result<Self>
        where
            Core: ValueCore + $trait<Output = Core>,
        {
            let (left, right) = (Core::convert_from(self)?, Core::convert_from(other)?);
            let result = left $op right;
            Ok(result.into())
        }
    };
}
macro_rules! natural_binary_ops {
    ($(($name: ident, $trait: ident, $op: tt, $generic_name: ident)),+) => {
        use std::ops::{$($trait),+};
        impl Value {
            $(
                natural_binary_op!($name, $trait, $op);
                generic!($name, $generic_name);
            )+
        }
    }
}

macro_rules! boolean_binary_op {
    ($name: ident, $op: tt) => {
        pub fn $name(self, other: Self) -> Result<Self>
        {
            let (left, right): (bool, bool) = (self.convert()?, other.convert()?);
            let result = left $op right;
            Ok(result.into())
        }
    };
}
macro_rules! boolean_binary_ops {
    ($(($name: ident, $op: tt)),+) => {
        impl Value {
            $(boolean_binary_op!($name, $op);)+
        }
    }
}

macro_rules! comparative_binary_op {
    ($name: ident, $op: tt) => {
        pub fn $name(self, other: Self) -> Result<Self> {
            Ok(Value::Bool(self $op other))
        }
    };
}
macro_rules! comparative_binary_ops {
    ($(($name: ident, $op: tt)),+) => {
        impl Value {
            $(comparative_binary_op!($name, $op);)+
        }
    }
}

macro_rules! generic {
	($name: ident, $generic_name: ident) => {
		pub fn $generic_name(self, other: Self) -> Result<Self> {
			if matches!(self, Value::Null) || matches!(other, Value::Null) {
				Ok(Value::Null)
			} else if !i64::convert_from(self.clone()).is_err()
				&& !i64::convert_from(other.clone()).is_err()
			{
				self.$name::<i64>(other)
			} else if !f64::convert_from(self.clone()).is_err()
				&& !f64::convert_from(other.clone()).is_err()
			{
				self.$name::<f64>(other)
			} else {
				Err(ValueError::OnlySupportsNumeric(
					if f64::convert_from(self.clone()).is_err() {
						self
					} else {
						other
					},
					stringify!($name),
				)
				.into())
			}
		}
	};
}

natural_binary_ops!(
	(add, Add, +, generic_add),
	(subtract, Sub, -, generic_subtract),
	(multiply, Mul, *, generic_multiply),
	(divide, Div, /, generic_divide),
	(modulus, Rem, %, generic_modulus)
);

boolean_binary_ops!(
	(and, &),
	(or, |),
	(xor, ^)
);

comparative_binary_ops!(
	(eq, ==),
	(not_eq, !=),
	(gt, >),
	(gt_eq, >=),
	(lt, <),
	(lt_eq, <=)
);

impl Value {
	pub fn string_concat(self, other: Self) -> Result<Self> {
		if matches!(self, Value::Null) || matches!(other, Value::Null) {
			Ok(Value::Null)
		} else {
			Ok(format!(
				"{}{}",
				String::convert_from(self)?,
				String::convert_from(other)?
			)
			.into())
		}
	}
}