Working version

3 files changed, 1069 insertions, 1 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c77e177..ad18778 100644
--- a/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
index fc76ecb..514539c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,6 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+reqwest = { version = "0.11", features = ["blocking"] }
+serde = { version = "1.0.104", features = ["derive"] }
+serde_json = "1.0.48"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..cf4dc66 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,108 @@
+use serde_json::Value;
+use std::error::Error;
+use std::fs;
+use std::path::Path;
+
+const CONFIG_PATH: &str = "/home/adam/.config/forecast";
+
+#[derive(Debug)]
+struct WeatherInfo {
+    icon: char,
+    temp: i32,
+}
+
 fn main() {
-    println!("Hello, world!");
+    let (current_endpoint, forecast_endpoint) = init();
+    let current_data = req_weather(current_endpoint).unwrap();
+    let forecast_data = req_weather(forecast_endpoint).unwrap();
+
+    let current_weather = parse_current(current_data).unwrap();
+    let forecast_weather = parse_forecast(forecast_data).unwrap();
+    let trend = get_trend(current_weather.temp, forecast_weather.temp);
+
+    println!(
+        "  {} {}°C {} {} {}°C  ",
+        current_weather.icon,
+        current_weather.temp,
+        trend,
+        forecast_weather.icon,
+        forecast_weather.temp
+    );
+}
+
+fn init() -> (String, String) {
+    let city_id = read_config_file("city_id");
+    let api_key = read_config_file("api_key");
+
+    let current_endpoint: String = format!(
+        "https://api.openweathermap.org/data/2.5/weather?id={}&appid={}&units=metric",
+        city_id, api_key
+    );
+    let forecast_endpoint: String = format!(
+        "https://api.openweathermap.org/data/2.5/forecast?id={}&appid={}&units=metric&cnt=1",
+        city_id, api_key
+    );
+    (current_endpoint, forecast_endpoint)
+}
+
+fn read_config_file(file_name: &str) -> String {
+    let path = Path::new(CONFIG_PATH).join(file_name);
+    fs::read_to_string(path.to_string_lossy().to_string()).unwrap()
+}
+
+fn req_weather(endpoint: String) -> Result<Value, Box<dyn Error>> {
+    let resp = reqwest::blocking::get(endpoint)?.text()?;
+    Ok(serde_json::from_str(&resp)?)
+}
+
+fn parse_current(response: Value) -> Option<WeatherInfo> {
+    let icon_code = response["weather"][0]["icon"].as_str()?;
+    let temperature = response["main"]["temp"].as_f64()?.round();
+
+    Some(WeatherInfo {
+        icon: get_icon(icon_code),
+        temp: temperature as i32,
+    })
+}
+
+fn parse_forecast(response: Value) -> Option<WeatherInfo> {
+    let icon_code = response["list"][0]["weather"][0]["icon"].as_str()?;
+    let temperature = response["list"][0]["main"]["temp"].as_f64()?.round();
+
+    Some(WeatherInfo {
+        icon: get_icon(icon_code),
+        temp: temperature as i32,
+    })
+}
+
+fn get_icon(code: &str) -> char {
+    match code {
+        "01d" => '',         // Clear sky - day
+        "01n" => '',         // Clear sky - night
+        "02d" => '',         // Few clouds (11-25%) - day
+        "02n" => '',         // Few clouds (11-25%) - night
+        "03d" | "03n" => '', // Scattered clouds (25-50%) - day/night
+        "04d" | "04n" => '', // Broken / Overcast clouds (51-84% / 85-100%) - day/night
+        "09d" => '',         // Shower rain - day
+        "09n" => '',         // Shower rain - night
+        "10d" => '',         // Moderate / heavy rain - day
+        "10n" => '',         // Moderate / heavy rain - night
+        "11d" => '',         // Thunderstorm - day
+        "11n" => '',         // Thunderstorm - night
+        "13d" => '',         // Snow - day
+        "13n" => '',         // Snow - night
+        "50d" => '',         // Fog - day
+        "50n" => '',         // Fog - night
+        _ => '',             // ??
+    }
+}
+
+fn get_trend(t1: i32, t2: i32) -> char {
+    if t1 < t2 {
+        ''
+    } else if t1 > t2 {
+        ''
+    } else {
+        ''
+    }
 }