From 5c53942b62970f644b1ae00b789e7e30c54df89f Mon Sep 17 00:00:00 2001
From: Dorian Pula <dorian.pula@amber-penguin-software.ca>
Date: Wed, 6 Nov 2019 17:42:41 -0500
Subject: [PATCH] Add a class and windchill example.

---
 README.md  |  4 ++++
 src/lib.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/README.md b/README.md
index 69f53b1..93ff293 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,7 @@ Insure the following dependencies are in place:
 ## Documentation
 
 * [PyO3 Python - Rust bindings](https://pyo3.rs/master/get_started.html)
+* Windchill calculations:
+    * [PDF from US Gov](https://www.weather.gov/media/epz/wxcalc/windChill.pdf)
+    * [Calculation in Celsius and kph](https://www.calcunation.com/calculator/wind-chill-celsius.php)
+    * [Windchill Calculator](https://www.weather.gov/epz/wxcalc_windchill)
diff --git a/src/lib.rs b/src/lib.rs
index e9c6f08..b86119b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,6 +5,32 @@ extern crate pyo3;
 
 use pyo3::prelude::*;
 
+#[pyclass(module = "unit_converter")]
+struct Temperature {
+    celsius: f32,
+}
+
+#[pymethods]
+impl Temperature {
+    #[new]
+    fn new(obj: &PyRawObject, temperature: f32) {
+        obj.init(Temperature {
+            celsius: temperature,
+        });
+    }
+
+    fn to_fahrenheit(&self) -> f32 {
+        self.celsius * 1.8 + 32.0
+    }
+
+    fn windchill(&self, wind_speed_kph: f32) -> f32 {
+        13.12 + (0.6215 * self.celsius) - (11.37 * wind_speed_kph.powf(0.16))
+            + (0.3965 * self.celsius * wind_speed_kph.powf(0.16))
+    }
+}
+
+// TODO: Add a test that -20 C and 32 kph feels like -32.9
+
 #[pyfunction]
 fn convert_to_fahrenheit(celsius: f32) -> f32 {
     celsius * 1.8 + 32.0
@@ -22,6 +48,7 @@ fn batch_convert_to_fahrenheit(celsius: Vec<f32>) -> Vec<f32> {
 fn unit_converter(_py: Python, m: &PyModule) -> PyResult<()> {
     m.add_wrapped(wrap_pyfunction!(convert_to_fahrenheit))?;
     m.add_wrapped(wrap_pyfunction!(batch_convert_to_fahrenheit))?;
+    m.add_class::<Temperature>()?;
     Ok(())
 }