1 files changed, 28 insertions, 0 deletions
diff --git a/src/domain/error.rs b/src/domain/error.rs
new file mode 100644
index 0000000..4602b7e
--- /dev/null
+++ b/src/domain/error.rs
@@ -0,0 +1,28 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum DomainError {
+    #[error("Invalid time range: start time must be before end time")]
+    InvalidTimeRange,
+
+    #[error("Invalid color value")]
+    InvalidColor,
+
+    #[error("Invalid frequency")]
+    InvalidFrequency,
+
+    #[error("Invalid interval: must be greater than 0")]
+    InvalidInterval,
+
+    #[error("Calendar not found: {0}")]
+    CalendarNotFound(String),
+
+    #[error("Event not found: {0}")]
+    EventNotFound(String),
+
+    #[error("Recurrence not found: {0}")]
+    RecurrenceNotFound(String),
+
+    #[error("Cannot modify archived calendar")]
+    CalendarArchived,
+}