Initial Commit

2 files changed, 47 insertions, 0 deletions

diff --git a/src/notd/mod.rs b/src/notd/mod.rs
new file mode 100644
index 0000000..07cbe6e
--- /dev/null
+++ b/src/notd/mod.rs
@@ -0,0 +1,31 @@
+mod rand;
+
+use gtk::glib::DateTime;
+
+pub fn current_datetime() -> DateTime {
+    if let Ok(datetime) = DateTime::now_local() {
+        return datetime;
+    } else {
+        return DateTime::from_unix_utc(0).expect("DateTime is Broken");
+    }
+}
+
+pub fn number_of_the_day() -> u8 {
+    (rand::random_from_seed(date_to_seed(current_datetime())) % 100) as u8
+}
+
+pub fn personal_number_of_the_day(name_in: &str) -> u8 {
+    let name = name_in.trim().to_lowercase();
+    if &name == "" || &name == "name" {
+        return number_of_the_day();
+    }
+    ((rand::random_from_seed(date_to_seed(current_datetime()))
+        .wrapping_add(rand::seed_from_name(&name)))
+        % 100) as u8
+}
+
+fn date_to_seed(date: DateTime) -> u64 {
+    format!("{}{}{}", date.day_of_month(), date.month(), date.year())
+        .parse()
+        .unwrap_or(0)
+}
diff --git a/src/notd/rand.rs b/src/notd/rand.rs
new file mode 100644
index 0000000..95c8f0b
--- /dev/null
+++ b/src/notd/rand.rs
@@ -0,0 +1,16 @@
+use std::{
+    collections::hash_map::DefaultHasher,
+    hash::{Hash, Hasher},
+};
+
+pub fn random_from_seed(seed: u64) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    seed.hash(&mut hasher);
+    hasher.finish()
+}
+
+pub fn seed_from_name(name: &str) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    name.hash(&mut hasher);
+    hasher.finish() as u64
+}