From d1950def002f7b25e6447d7be9b1522d7c7722ef Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Mon, 30 Jun 2025 15:32:38 -0700
Subject: [PATCH] [core] Add conversions between Score and f32

These conversions assume the float value you want is a point value where 1 point
equals 1 pawn.
---
 core/src/score.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/core/src/score.rs b/core/src/score.rs
index 2dfd7c9..c7f4f2e 100644
--- a/core/src/score.rs
+++ b/core/src/score.rs
@@ -6,6 +6,7 @@ use std::{
 };
 
 pub(crate) type Value = i32;
+pub(crate) type FloatValue = f32;
 
 /// A score for a position in centipawns.
 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
@@ -38,6 +39,24 @@ impl Score {
         Self(value)
     }
 
+    /// Create a [`Score`] from a floating point value. This method assumes the
+    /// value is a point value where 1 point = 1 pawn. The floating point value
+    /// will be truncated as part of this conversion.
+    ///
+    /// ## Examples
+    ///
+    /// ```
+    /// use chessfriend_core::score::Score;
+    /// assert_eq!(Score::from_float(3.1415926), Score(314));
+    /// assert_ne!(Score::from_float(2.7182818).to_float(), 2.7182818);
+    /// ```
+    ///
+    #[must_use]
+    pub const fn from_float(value: FloatValue) -> Self {
+        #[allow(clippy::cast_possible_truncation)]
+        Self((value * Self::CENTIPAWNS_PER_POINT) as Value)
+    }
+
     /// Returns `true` if this [`Score`] is zero.
     ///
     /// ## Examples
@@ -52,6 +71,14 @@ impl Score {
     pub const fn is_zero(&self) -> bool {
         self.0 == 0
     }
+
+    /// Return a floating point value in points where 1 point = 1 pawn. This
+    /// conversion loses precision.
+    #[must_use]
+    #[allow(clippy::cast_precision_loss)]
+    pub const fn to_float(&self) -> FloatValue {
+        self.0 as f32 / Self::CENTIPAWNS_PER_POINT
+    }
 }
 
 impl Add for Score {