computer: fix coarse lazy indexes

crates/brk_core/src/structs/dateindex.rs

@@ -115,7 +115,7 @@ impl FromCoarserIndex<WeekIndex> for DateIndex {
         } else if coarser == 1 {
             1
         } else {
-            4 + (coarser - 1) * 7
+            4 + (coarser - 2) * 7
         }
     }
 
@@ -126,7 +126,7 @@ impl FromCoarserIndex<WeekIndex> for DateIndex {
         } else if coarser == 1 {
             3
         } else {
-            3 + coarser * 7
+            3 + (coarser - 1) * 7
         }
     }
 }

crates/brk_core/src/structs/decadeindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -63,6 +66,27 @@ impl Add<usize> for DecadeIndex {
     }
 }
 
+impl Add<DecadeIndex> for DecadeIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for DecadeIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for DecadeIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl From<DateIndex> for DecadeIndex {
     fn from(value: DateIndex) -> Self {
         Self::from(Date::from(value))

crates/brk_core/src/structs/monthindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -57,6 +60,27 @@ impl Add<usize> for MonthIndex {
     }
 }
 
+impl Add<MonthIndex> for MonthIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for MonthIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for MonthIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl From<DateIndex> for MonthIndex {
     fn from(value: DateIndex) -> Self {
         Self::from(Date::from(value))

crates/brk_core/src/structs/quarterindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -57,6 +60,27 @@ impl Add<usize> for QuarterIndex {
     }
 }
 
+impl Add<QuarterIndex> for QuarterIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for QuarterIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for QuarterIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl From<MonthIndex> for QuarterIndex {
     fn from(value: MonthIndex) -> Self {
         Self((usize::from(value) / 3) as u16)

crates/brk_core/src/structs/semesterindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -57,6 +60,27 @@ impl Add<usize> for SemesterIndex {
     }
 }
 
+impl Add<SemesterIndex> for SemesterIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for SemesterIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for SemesterIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl From<MonthIndex> for SemesterIndex {
     fn from(value: MonthIndex) -> Self {
         Self((usize::from(value) / 6) as u16)

crates/brk_core/src/structs/weekindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -49,6 +52,27 @@ impl From<WeekIndex> for usize {
     }
 }
 
+impl Add<WeekIndex> for WeekIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for WeekIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for WeekIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl Add<usize> for WeekIndex {
     type Output = Self;
 

crates/brk_core/src/structs/yearindex.rs

@@ -1,4 +1,7 @@
-use std::{fmt::Debug, ops::Add};
+use std::{
+    fmt::Debug,
+    ops::{Add, AddAssign, Div},
+};
 
 use serde::{Deserialize, Serialize};
 use zerocopy_derive::{FromBytes, Immutable, IntoBytes, KnownLayout};
@@ -51,6 +54,27 @@ impl Add<usize> for YearIndex {
     }
 }
 
+impl Add<YearIndex> for YearIndex {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::from(self.0 + rhs.0)
+    }
+}
+
+impl AddAssign for YearIndex {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = Self(self.0 + rhs.0)
+    }
+}
+
+impl Div<usize> for YearIndex {
+    type Output = Self;
+    fn div(self, _: usize) -> Self::Output {
+        unreachable!()
+    }
+}
+
 impl From<DateIndex> for YearIndex {
     fn from(value: DateIndex) -> Self {
         Self::from(Date::from(value))