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use crate::geocoding::{
    error::Error,
    forward::ForwardRequest,
};

impl<'a> ForwardRequest<'a> {

    /// Ensures the built query is valid. This function checks the combination
    /// of parameters to ensure that they make sense together and that Google
    /// Maps Geocoding API will accept them - i.e. require an address or
    /// components to be specified. This function does not check parameter
    /// values for validity - i.e. it will not Latitudes/Longitudes are valid
    /// and well-formed.
    ///
    /// ## Arguments:
    ///
    /// This method accepts no arguments.

    pub fn validate(&mut self) -> Result<&'a mut ForwardRequest, Error> {

        // If a positional request has been set...
        if self.address == None && self.components == None {
            return Err(Error::AddressOrComponentsRequired)
        } // if

        // Indicate that the request passed validation.
        self.validated = true;

        // Return modified Request struct to caller.
        Ok(self)

    } // fn

} // impl