1 files changed, 95 insertions, 0 deletions
diff --git a/src/statistics/damage.rs b/src/statistics/damage.rs
new file mode 100644
index 0000000..fdf723f
--- /dev/null
+++ b/src/statistics/damage.rs
@@ -0,0 +1,95 @@
+use super::math::{Monoid, RecordFunc, Semigroup};
+use std::fmt;
+
+/// Type of the damage.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum DamageType {
+    Physical,
+    Condition,
+}
+
+/// Meta information about a damage log entry.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Meta {
+    pub source: u64,
+    pub target: u64,
+    pub kind: DamageType,
+    pub skill: u16,
+}
+
+/// A small wrapper that wraps a damage number.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Damage(pub u64);
+
+impl Semigroup for Damage {
+    #[inline]
+    fn combine(&self, other: &Self) -> Self {
+        Damage(self.0 + other.0)
+    }
+}
+
+impl Monoid for Damage {
+    #[inline]
+    fn mempty() -> Self {
+        Damage(0)
+    }
+}
+
+/// Provides access to the damage log.
+#[derive(Clone)]
+pub struct DamageLog {
+    inner: RecordFunc<u64, Meta, Damage>,
+}
+
+impl DamageLog {
+    pub fn new() -> Self {
+        DamageLog {
+            inner: RecordFunc::new(),
+        }
+    }
+
+    pub fn log(
+        &mut self,
+        time: u64,
+        source: u64,
+        target: u64,
+        kind: DamageType,
+        skill: u16,
+        value: u64,
+    ) {
+        self.inner.insert(
+            time,
+            Meta {
+                source,
+                target,
+                kind,
+                skill,
+            },
+            Damage(value),
+        )
+    }
+
+    pub fn damage_between<F: FnMut(&Meta) -> bool>(
+        &self,
+        start: u64,
+        stop: u64,
+        filter: F,
+    ) -> Damage {
+        self.inner.between_only(&start, &stop, filter)
+    }
+
+    pub fn damage<F: FnMut(&Meta) -> bool>(&self, filter: F) -> Damage {
+        self.inner.tally_only(filter)
+    }
+}
+
+impl fmt::Debug for DamageLog {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "DamageLog {{ {} events logged, {:?} total damage }}",
+            self.inner.len(),
+            self.inner.tally()
+        )
+    }
+}