From 33a8ebd260ba0b31ed1f07f386d928d4c6b0724a Mon Sep 17 00:00:00 2001
From: Shea Frembling <sfrembling@gmail.com>
Date: Tue, 3 Mar 2026 14:05:51 -0600
Subject: [PATCH] add csv module with Row struct and make_checksum fn

---
 src/csv.rs  | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs |  2 ++
 2 files changed, 75 insertions(+)
 create mode 100644 src/csv.rs

diff --git a/src/csv.rs b/src/csv.rs
new file mode 100644
index 0000000..194f7d5
--- /dev/null
+++ b/src/csv.rs
@@ -0,0 +1,73 @@
+pub struct Row {
+    name: String,
+    hut_type: String,
+    path: String,
+    tare: f64,
+    mat_id: String,
+    quantity: f64,
+    lot_id: String,
+    uom: String,
+    lot_status: String,
+    born: chrono::DateTime<chrono::Local>,
+    expire: chrono::DateTime<chrono::Local>,
+}
+
+impl Row {
+    pub fn new(
+        name: &str,
+        hut_type: &str,
+        path: &str,
+        tare: f64,
+        mat_id: &str,
+        quantity: f64,
+        uom: &str,
+        lot_status: &str,
+        checksum: bool,
+    ) -> Self {
+        let born = chrono::Local::now();
+        let expire = born
+            .checked_add_days(chrono::Days::new(365))
+            .expect("A valid date time");
+        let name = match checksum {
+            true => make_checksum(),
+            false => name.to_ascii_uppercase(),
+        };
+        Self {
+            name: name.clone(),
+            hut_type: hut_type.to_ascii_uppercase(),
+            path: path.to_ascii_uppercase(),
+            tare,
+            mat_id: mat_id.to_ascii_uppercase(),
+            quantity,
+            lot_id: format!("{}-{}", name, mat_id).to_ascii_uppercase(),
+            uom: uom.to_ascii_uppercase(),
+            lot_status: lot_status.to_ascii_uppercase(),
+            born,
+            expire,
+        }
+    }
+}
+
+fn make_checksum() -> String {
+    let base = rand::random_range(10000..99999).to_string();
+    let expect = "a valid character in the base checksum";
+
+    let split = format!(
+        "{}{}{}{}{}",
+        base.chars().next().expect(expect),
+        base.chars().nth(2).expect(expect),
+        base.chars().nth(4).expect(expect),
+        base.chars().nth(1).expect(expect),
+        base.chars().nth(3).expect(expect)
+    )
+    .repeat(2);
+
+    let sum: u32 = split
+        .chars()
+        .map(|c| c.to_digit(10).expect("a valid integer value"))
+        .sum();
+
+    let last = (10 - (sum % 10)) % 10;
+
+    format!("{}{}", base, last)
+}
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..99c5e26 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+mod csv;
+
 fn main() {
     println!("Hello, world!");
 }