rowt/src/scheduled/weather.rs

use chrono::DateTime;
use serde::{Deserialize, Serialize};
use sqlx::SqlitePool;

use crate::model::weather::Weather;

pub async fn update(db: &SqlitePool, api_key: &str) -> Result<(), String> {
    let mut tx = db.begin().await.unwrap();

    // 1. Delete weather data
    Weather::delete_all(&mut tx).await;

    // 2. Fetch
    let data = fetch(api_key)?;
    for d in data.daily {
        let Some(date) = DateTime::from_timestamp(d.dt, 0) else {
            println!("Skipping {} because convertion to datetime failed", d.dt);
            continue;
        };
        let max_temp = d.temp.max;
        let wind_gust = d.wind_gust;
        let rain_mm = d.rain.unwrap_or(0.);

        Weather::create(
            &mut tx,
            date.naive_utc().into(),
            max_temp,
            wind_gust,
            rain_mm,
        )
        .await?
    }

    // 3. Save in DB
    tx.commit().await.unwrap();

    Ok(())
}
#[derive(Serialize, Deserialize, Debug, Clone)]
struct Data {
    lat: f64,
    lon: f64,
    timezone: String,
    timezone_offset: i64,
    daily: Vec<Daily>,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
struct Daily {
    dt: i64,
    sunrise: i64,
    sunset: i64,
    moonrise: i64,
    moonset: i64,
    moon_phase: f64,
    summary: String,
    temp: Temp,
    feels_like: FeelsLike,
    pressure: i64,
    humidity: i64,
    dew_point: f64,
    wind_speed: f64,
    wind_deg: i64,
    wind_gust: f64,
    weather: Vec<DailyWeather>,
    clouds: i64,
    pop: f64,
    rain: Option<f64>,
    uvi: f64,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
struct Temp {
    day: f64,
    min: f64,
    max: f64,
    night: f64,
    eve: f64,
    morn: f64,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
struct FeelsLike {
    day: f64,
    night: f64,
    eve: f64,
    morn: f64,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
struct DailyWeather {
    id: i64,
    main: String,
    description: String,
    icon: String,
}

fn fetch(api_key: &str) -> Result<Data, String> {
    let url = format!("https://api.openweathermap.org/data/3.0/onecall?lat=48.31970&lon=14.29451&units=metric&exclude=current,minutely,hourly,alert&appid={api_key}");

    match ureq::get(&url).call() {
        Ok(response) => {
            let data: Result<Data, _> = response.into_json();

            if let Ok(data) = data {
                return Ok(data);
            } else {
                return Err(format!(
                    "Failed to parse the json received by {url}: {}",
                    data.err().unwrap()
                ));
            }
        }
        Err(_) => {
            return Err(format!(
                "Could not fetch {url}, do you have internet? Maybe their server is down?"
            ));
        }
    }
}