From a28a965d12124d95b9ec21f72bc60e6cabcfb276 Mon Sep 17 00:00:00 2001
From: Rhys Lloyd <krakow20@gmail.com>
Date: Mon, 18 May 2026 19:17:11 +0000
Subject: [PATCH] seed_from_u64 (#7)

Closes #5

Reviewed-on: https://git.aleshym.co/Quaternions/card_game/pulls/7
Co-authored-by: Rhys Lloyd <krakow20@gmail.com>
Co-committed-by: Rhys Lloyd <krakow20@gmail.com>
---
 Cargo.lock               |  1 +
 klondike-cli/Cargo.toml  |  1 +
 klondike-cli/src/main.rs | 11 +++++++++--
 klondike/Cargo.toml      |  2 +-
 klondike/src/lib.rs      | 12 +++++++-----
 klondike/src/test.rs     |  4 ++--
 6 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index c2b05c6..34560f3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -138,6 +138,7 @@ version = "0.1.0"
 dependencies = [
  "card_game",
  "klondike",
+ "rand",
 ]
 
 [[package]]
diff --git a/klondike-cli/Cargo.toml b/klondike-cli/Cargo.toml
index b6f74d2..5816939 100644
--- a/klondike-cli/Cargo.toml
+++ b/klondike-cli/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2024"
 [dependencies]
 card_game = { version = "0.1.0", path = "../card_game" }
 klondike = { version = "0.1.0", path = "../klondike" }
+rand = { version = "0.10.1", default-features = false, features = ["thread_rng"] }
diff --git a/klondike-cli/src/main.rs b/klondike-cli/src/main.rs
index d5a58ce..973939d 100644
--- a/klondike-cli/src/main.rs
+++ b/klondike-cli/src/main.rs
@@ -255,10 +255,14 @@ fn get_good_move(state: &Klondike) -> Option<KlondikeInstruction> {
 }
 
 fn main() -> Result<(), std::io::Error> {
-	let mut session = Session::new_default(Klondike::new_random());
+	use rand::RngExt;
+	let mut rng = rand::rng();
+	let mut seed = rng.random();
+	let mut session = Session::new_default(Klondike::with_seed(seed));
 	let mut input = String::new();
 	loop {
 		// display stats
+		println!("seed: {seed} ");
 		println!("{}", Displayed(session.stats()));
 		// display game
 		println!("{}", Displayed(session.state()));
@@ -273,7 +277,10 @@ fn main() -> Result<(), std::io::Error> {
 
 		// run game
 		match instruction {
-			SessionInstruction::New => session = Session::new_default(Klondike::new_random()),
+			SessionInstruction::New => {
+				seed = rng.random();
+				session = Session::new_default(Klondike::with_seed(seed))
+			}
 			SessionInstruction::Undo => session.undo(),
 			SessionInstruction::Exit => break Ok(()),
 			SessionInstruction::Hint => {
diff --git a/klondike/Cargo.toml b/klondike/Cargo.toml
index b71a19b..96dccbf 100644
--- a/klondike/Cargo.toml
+++ b/klondike/Cargo.toml
@@ -5,4 +5,4 @@ edition = "2024"
 
 [dependencies]
 card_game = { version = "0.1.0", path = "../card_game" }
-rand = { version = "0.10.1", default-features = false, features = ["thread_rng"] }
+rand = { version = "0.10.1", default-features = false, features = ["std_rng"] }
diff --git a/klondike/src/lib.rs b/klondike/src/lib.rs
index 978e733..14e51f6 100644
--- a/klondike/src/lib.rs
+++ b/klondike/src/lib.rs
@@ -1,4 +1,4 @@
-pub type Rng = rand::rngs::ThreadRng;
+pub type Rng = rand::rngs::StdRng;
 
 use card_game::{Card, Game, Pile, Rank, Stack};
 
@@ -532,14 +532,16 @@ pub struct Klondike {
 	state: KlondikeState,
 }
 impl Klondike {
-	pub fn new_random() -> Self {
-		Self::new(Rng::default())
+	pub fn with_seed(seed: u64) -> Self {
+		use rand::SeedableRng;
+		let rng = Rng::seed_from_u64(seed);
+		Self::with_rng(rng)
 	}
-	pub fn new(mut seed: Rng) -> Self {
+	pub fn with_rng(mut rng: Rng) -> Self {
 		// shuffle a new deck
 		let mut deck = Stack::full_deck(card_game::Deck::Deck1);
 		use rand::seq::SliceRandom;
-		deck.shuffle(&mut seed);
+		deck.shuffle(&mut rng);
 		let mut deck = deck.into_iter();
 
 		// generate tableaus
diff --git a/klondike/src/test.rs b/klondike/src/test.rs
index 1eec73b..84bcf90 100644
--- a/klondike/src/test.rs
+++ b/klondike/src/test.rs
@@ -3,13 +3,13 @@ use card_game::Session;
 #[test]
 fn test_is_winnable() {
 	// is winnable
-	let is_winnable = Session::new_default(Klondike::new_random()).is_winnable();
+	let is_winnable = Session::new_default(Klondike::with_seed(123)).is_winnable();
 	println!("is_winnable = {is_winnable:?}");
 }
 #[test]
 fn test_klondike() {
 	// create game session
-	let game = Klondike::new_random();
+	let game = Klondike::with_seed(123);
 	let mut session = Session::new_default(game);
 
 	// is winnable