1 files changed, 35 insertions, 0 deletions
diff --git a/apps/koffice/libko/src/invoice.rs b/apps/koffice/libko/src/invoice.rs
new file mode 100644
index 000000000000..737513785916
--- /dev/null
+++ b/apps/koffice/libko/src/invoice.rs
@@ -0,0 +1,35 @@
+use chrono::NaiveDate;
+use serde::{Deserialize, Serialize};
+use std::string::ToString;
+
+/// A specification to build invoice IDs with
+#[derive(Serialize, Deserialize)]
+pub enum InvoiceId {
+    YearMonthId(u16, u8, usize),
+}
+
+impl ToString for InvoiceId {
+    fn to_string(&self) -> String {
+        match self {
+            Self::YearMonthId(yr, mo, id) => format!("#{}-{:02}-{:04}", yr, mo, id),
+        }
+    }
+}
+
+/// An invoice for a specific project
+#[derive(Serialize, Deserialize)]
+pub struct Invoice {
+    id: InvoiceId,
+    client: String,
+    project: String,
+    date: NaiveDate,
+    amount: usize,
+    currency: String,
+    vat: u8,
+}
+
+#[test]
+fn invoice_id_fmt() {
+    let inv_id = InvoiceId::YearMonthId(2020, 06, 0055);
+    assert_eq!(inv_id.to_string(), "#2020-06-0055".to_string());
+}