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use crate::directions::travel_mode::TravelMode;
use crate::distance_matrix::{
    error::Error,
    request::Request,
}; // use

impl<'a> Request<'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 Directions API will accept them - i.e. it will not allow both a
    /// arrival time and departure time in the same query. This function does
    /// not check parameter values for validity - i.e. it will not ensure
    /// Polylines or Place ID's are valid and well-formed.
    ///
    /// ## Arguments:
    ///
    /// This method accepts no arguments.

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

        if let Some(travel_mode) = &self.travel_mode {

            // If the transit mode is not set to TravelMode::Transit...
            if *travel_mode != TravelMode::Transit {

                // ...an arrival time cannot be set:
                if let Some(arrival_time) = &self.arrival_time {
                    return Err(Error::ArrivalTimeIsForTransitOnly(
                        String::from(travel_mode),
                        arrival_time.format("%F %r")
                    )) // Err
                } // if

                // ...a transit mode cannot be set:
                if let Some(transit_modes) = &self.transit_modes {
                    return Err(Error::TransitModeIsForTransitOnly(
                        String::from(travel_mode),
                        String::from(transit_modes.iter().map(|mode| String::from(mode) + "|").collect::<String>().trim_end_matches('|'))
                    )) // Err
                } // if

                // ...a transit route preference cannot be set:
                if let Some(transit_route_preference) = &self.transit_route_preference {
                    return Err(Error::TransitRoutePreferenceIsForTransitOnly(
                        String::from(travel_mode),
                        String::from(transit_route_preference),
                    )) // Err
                } // if

            } // if

        } // if

        // If an arrival time has been set...
        if let Some(arrival_time) = &self.arrival_time {

            // ...a departure time cannot be set:
            if let Some(departure_time) = &self.departure_time {
                return Err(Error::EitherDepartureTimeOrArrivalTime(
                    arrival_time.format("%F %r"),
                    String::from(departure_time),
                )) // Err
            } // if

        } // if

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

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

    } // fn

} // impl