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use crate::directions::{
    SERVICE_URL,
    OUTPUT_FORMAT,
    error::Error,
    request::Request,
}; // crate::directions

impl<'a> Request<'a> {

    /// Returns the URL query string that represents the query you've built.
    ///
    /// ## Description:
    ///
    /// Returns the query string that will be sent to the Google Maps API. It
    /// is the result of the builder pattern. This method could be useful for
    /// records or logging. It could also be used for passing to your HTTP
    /// client of choice and executing the HTTP GET request yourself.
    ///
    /// ## Arguments:
    ///
    /// This method accepts no arguments.

    pub fn query_url(&'a mut self) -> Result<String, Error> {
        let query_string = match &self.query {
            // If query string has already been built, return it:
            Some(query_string) => query_string,
            // If it hasn't been built, build it:
            None => self.validate()?.build()?.query.as_ref().unwrap(),
        }; // match
        Ok(format!("{SERVICE_URL}/{OUTPUT_FORMAT}?{query_string}"))
    } // fn

} // impl