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use chakracore_sys::*;
use context::ContextGuard;
use super::{Value, Object};
use Property;

macro_rules! ctor {
    ($name:ident, $errtype:ident, $doc:expr) => {
        #[doc=$doc]
        pub fn $name(guard: &ContextGuard, message: &str) -> Self {
            create_error(guard, message, $errtype)
        }
    };
}

/// A JavaScript error.
pub struct Error(JsValueRef);

impl Error {
    ctor!(new, JsCreateError, "Creates a new error.");
    ctor!(range_error, JsCreateRangeError, "Creates a new range error.");
    ctor!(reference_error, JsCreateReferenceError, "Creates a new reference error.");
    ctor!(syntax_error, JsCreateSyntaxError, "Creates a new syntax error.");
    ctor!(type_error, JsCreateTypeError, "Creates a new type error.");
    ctor!(uri_error, JsCreateURIError, "Creates a new URI error.");

    /// Returns the error's message.
    pub fn message(&self, guard: &ContextGuard) -> String {
        let property = Property::new(guard, "message");
        self.get(guard, &property).to_string(guard)
    }

    is_same!(Error, "Returns true if the value is an `Error`.");
}

/// Function definition for an error call.
type ErrorCall = unsafe extern "system" fn(JsValueRef, *mut JsValueRef) -> JsErrorCode;

/// Creates an error object from a specified API.
fn create_error(guard: &ContextGuard, message: &str, api: ErrorCall) -> Error {
    let message = super::String::new(guard, message);
    let mut value = JsValueRef::new();
    unsafe {
        jsassert!(api(message.as_raw(), &mut value));
        Error::from_raw(value)
    }
}

reference!(Error);
inherit!(Error, Object);
subtype!(Error, Value);

#[cfg(test)]
mod tests {
    use {test, value};

    #[test]
    fn string_conversion() {
        test::run_with_context(|guard| {
            let error = value::Error::type_error(guard, "FooBar");
            assert_eq!(error.to_string(guard), "TypeError: FooBar");
        });
    }
}