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use crate::distance_matrix::{error::Error, request::Request};
use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
impl<'a> Request<'a> {
/// Builds the query string for the Google Maps Directions API based on the
/// input provided by the client.
///
/// ## Arguments
///
/// This method accepts no arguments.
pub fn build(&mut self) -> Result<&'a mut Request, Error> {
// Ensure request has been validated before building the query string:
if !self.validated {
return Err(Error::RequestNotValidated);
}
// Builds the "required parameters" portion of the query string:
let mut query = format!(
"key={}&origins={}&destinations={}",
// Key:
self.client.key,
// Origins:
utf8_percent_encode(
&self
.origins
.iter()
.map(String::from)
.collect::<Vec<String>>()
.join("|"),
NON_ALPHANUMERIC
),
// Destinations:
utf8_percent_encode(
&self
.destinations
.iter()
.map(String::from)
.collect::<Vec<String>>()
.join("|"),
NON_ALPHANUMERIC
),
); // format!
// Builds the "optional parameters" portion of the query string:
// Arrival time key/value pair:
if let Some(arrival_time) = &self.arrival_time {
query.push_str("&arrival_time=");
query.push_str(&arrival_time.and_utc().timestamp().to_string());
} // if
// Avoid key/value pair:
if !self.restrictions.is_empty() {
query.push_str("&avoid=");
query.push_str(
&utf8_percent_encode(
&self
.restrictions
.iter()
.map(String::from)
.collect::<Vec<String>>()
.join("|"),
NON_ALPHANUMERIC,
)
.to_string(),
); // push_str
} // if
// Departure time key/value pair:
if let Some(departure_time) = &self.departure_time {
query.push_str("&departure_time=");
query.push_str(&String::from(departure_time));
} // if
// Language key/value pair:
if let Some(language) = &self.language {
query.push_str("&language=");
query.push_str(&String::from(language));
} // if
// Travel mode key/value pair:
if let Some(travel_mode) = &self.travel_mode {
query.push_str("&mode=");
query.push_str(&String::from(travel_mode).to_lowercase());
} // if
// Region key/value pair:
if let Some(region) = &self.region {
query.push_str("®ion=");
query.push_str(&String::from(region));
} // if
// Traffic model key/value pair:
if let Some(traffic_model) = &self.traffic_model {
query.push_str("&traffic_model=");
query.push_str(&String::from(traffic_model));
} // if
// Transit mode key/value pair:
if !self.transit_modes.is_empty() {
query.push_str("&transit_mode=");
query.push_str(
&utf8_percent_encode(
&self
.transit_modes
.iter()
.map(String::from)
.collect::<Vec<String>>()
.join("|"),
NON_ALPHANUMERIC,
)
.to_string(),
); // push_str
} // if
// Transit route preference key/value pair:
if let Some(transit_route_preference) = &self.transit_route_preference {
query.push_str("&transit_routing_preference=");
query.push_str(&String::from(transit_route_preference));
} // if
// Unit system key/value pair:
if let Some(unit_system) = &self.unit_system {
query.push_str("&units=");
query.push_str(&String::from(unit_system));
} // if
// Set query string in Request struct.
self.query = Some(query);
// Return modified Request struct to caller.
Ok(self)
} // fn
} // impl