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use super::client::NightscoutClient;
use crate::endpoints::Endpoint;
use crate::error::NightscoutError;
use std::marker::PhantomData;
use chrono::{DateTime, Utc};
use futures::stream::{self, StreamExt};
use reqwest::Method;
use serde::de::DeserializeOwned;
#[derive(Clone, Debug, PartialEq)]
/// Specifies target device filtering behavior.
pub enum Device {
/// Automatically attempts to determine the primary device name from recent data.
/// Performs an extra HTTP request (pre-flight) to find the device name.
Auto,
/// Fetches data from all devices.
All,
/// Fetches data only from a specific device name (e.g., "bubble").
Custom(String),
}
/// Trait for models that contain a device name field.
pub trait HasDevice {
fn device(&self) -> Option<&str>;
}
pub struct QueryBuilder<T> {
client: NightscoutClient,
endpoint: Endpoint,
from_date: Option<DateTime<Utc>>,
to_date: Option<DateTime<Utc>>,
count: usize,
method: Method,
id: Option<String>,
device: Device,
date_field: String,
_marker: PhantomData<T>,
}
impl<T> QueryBuilder<T> {
pub fn new(client: NightscoutClient, endpoint: Endpoint, method: Method) -> Self {
Self {
client,
endpoint,
from_date: None,
to_date: None,
count: 10,
method,
id: None,
device: Device::All,
date_field: "dateString".to_string(),
_marker: PhantomData,
}
}
/// Filters results to entries occurring on or after this date.
pub fn from(mut self, date: DateTime<Utc>) -> Self {
self.from_date = Some(date);
self
}
/// Filters results to entries occurring on or before this date.
pub fn to(mut self, date: DateTime<Utc>) -> Self {
self.to_date = Some(date);
self
}
/// Limits the number of results returned. Default is 10.
pub fn limit(mut self, count: usize) -> Self {
self.count = count;
self
}
/// targets a specific resource ID.
///
/// When used with `GET`, this fetches a single item.
/// When used with `DELETE`, this deletes a single item.
pub fn id(mut self, id: impl Into<String>) -> Self {
self.id = Some(id.into());
self
}
/// Some nightscout entries use different date filter names
///
/// This function allows to override the default dateString date field query
/// param name.
pub(crate) fn with_date_field(mut self, field: impl Into<String>) -> Self {
self.date_field = field.into();
self
}
/// Filters results by device name.
pub fn device(mut self, device: Device) -> Self {
self.device = device;
self
}
}
impl<T> QueryBuilder<T>
where
T: DeserializeOwned + Send + Sync + 'static + HasDevice,
{
/// Executes the built query.
///
/// This method sends the HTTP request to Nightscout constructed by the builder methods.
pub async fn send(self) -> Result<Vec<T>, NightscoutError> {
// For Device::Auto, it is needed to do a pre-flight to determine which device to use.
// While it has performance impact, it's a good tradeoff if you do not know the device
// names on the server and only want data from one device.
let resolved_device_name: Option<String> = match &self.device {
Device::Custom(name) => Some(name.clone()),
Device::Auto => {
let mut probe_url = self.client.base_url.join(self.endpoint.as_path())?;
{
let mut query = probe_url.query_pairs_mut();
query.append_pair("count", "1");
// We still need to access the data at the interval which the user wants us to get data
// if we didn't the device name could be (and probably will be) total wrong.
if let Some(from) = self.from_date {
let key = format!("find[{}][$gte]", self.date_field);
query.append_pair(&key, &from.to_rfc3339());
}
if let Some(to) = self.to_date {
let key = format!("find[{}][$lte]", self.date_field);
query.append_pair(&key, &to.to_rfc3339());
}
}
let probe_result: Result<Vec<T>, _> = self.client.fetch(probe_url).await;
match probe_result {
Ok(items) => items
.first()
.and_then(|item| item.device())
.map(|s| s.to_string()),
Err(_) => None,
}
}
Device::All => None,
};
let path = if let Some(id) = &self.id {
format!("{}/{}", self.endpoint.as_path(), id)
} else {
self.endpoint.as_path().to_string()
};
let mut url = self.client.base_url.join(&path)?;
{
let mut query = url.query_pairs_mut();
if self.id.is_none() {
query.append_pair("count", &self.count.to_string());
if let Some(from) = self.from_date {
let key = format!("find[{}][$gte]", self.date_field);
query.append_pair(&key, &from.to_rfc3339());
}
if let Some(to) = self.to_date {
let key = format!("find[{}][$lte]", self.date_field);
query.append_pair(&key, &to.to_rfc3339());
}
if let Some(name) = &resolved_device_name {
query.append_pair("find[device]", name);
}
}
}
match self.method {
Method::GET => {
let items: Vec<T> = self.client.fetch(url).await?;
Ok(items)
}
Method::DELETE => {
if self.id.is_some() {
let item: Vec<T> = self.client.fetch(url.clone()).await?;
let mut del_req = self.client.http.delete(url);
del_req = self.client.auth(del_req);
self.client.send_checked(del_req).await?;
Ok(item)
} else {
let items: Vec<serde_json::Value> = self.client.fetch(url.clone()).await?;
let delete_urls: Vec<reqwest::Url> = items
.iter()
.filter_map(|item| {
let id = item.get("_id")?.as_str()?;
let delete_path = format!("{}/{}", self.endpoint.as_path(), id);
self.client.base_url.join(&delete_path).ok()
})
.collect();
let delete_tasks = delete_urls.into_iter().map(|url| {
let client = self.client.clone();
async move {
let mut req = client.http.delete(url);
req = client.auth(req);
client.send_checked(req).await
}
});
stream::iter(delete_tasks)
.buffer_unordered(10)
.collect::<Vec<_>>()
.await;
let t_items: Vec<T> = serde_json::from_value(serde_json::Value::Array(items))?;
Ok(t_items)
}
}
_ => Err(NightscoutError::Unknown),
}
}
}