src/klondike.rs

@@ -179,6 +179,10 @@ pub struct DstFoundation {
 	foundation: Foundation,
 }
 impl DstFoundation {
+	const ITER_BEGIN: Self = Self {
+		src: KlondikePile::ITER_BEGIN,
+		foundation: Foundation::ITER_BEGIN,
+	};
 	const fn next(self) -> Option<Self> {
 		let DstFoundation { src, foundation } = self;
 		if let Some(src) = src.next() {
@@ -222,6 +226,7 @@ pub enum KlondikeInstruction {
 	RotateStock,
 }
 impl KlondikeInstruction {
+	const ITER_BEGIN: Self = Self::DstFoundation(DstFoundation::ITER_BEGIN);
 	const fn next(self) -> Option<Self> {
 		Some(match self {
 			Self::DstFoundation(dst_foundation) => match dst_foundation.next() {
@@ -387,33 +392,16 @@ impl KlondikeState {
 	fn is_instruction_valid(&self, instruction: KlondikeInstruction) -> bool {
 		match instruction {
 			// Stock -> Stock draws a card or resets the stock
-			KlondikeInstruction {
-				src: InstructionSrc::STOCK,
-				dst: KlondikePileId::Stock,
-			} => {
+			KlondikeInstruction::RotateStock => {
 				// cannot move stock when stock is empty
 				!self.stock.is_empty()
 			}
 
-			// cannot move cards to stock
-			KlondikeInstruction {
-				src: _,
-				dst: KlondikePileId::Stock,
-			} => false,
-
 			// moving to foundation has special rules
-			KlondikeInstruction { src, dst }
-				if matches!(
-					dst,
-					KlondikePileId::Foundation1
-						| KlondikePileId::Foundation2
-						| KlondikePileId::Foundation3
-						| KlondikePileId::Foundation4
-				) =>
-			{
+			KlondikeInstruction::DstFoundation(dst_foundation) => {
 				// get the top cards
-				if let Some(src_card) = self.src_card(src) {
-					match self.dst_card(dst) {
+				if let Some(src_card) = self.src_card(dst_foundation.src) {
+					match self.dst_card(dst_foundation.foundation) {
 						// destination card exists
 						Some(dst_card) => {
 							// suit matches?
@@ -429,10 +417,10 @@ impl KlondikeState {
 				}
 			}
 			// other = move to tableau
-			KlondikeInstruction { src, dst } => {
+			KlondikeInstruction::DstTableau(dst_tableau) => {
 				// get the top cards
-				if let Some(src_card) = self.src_card(src) {
-					match self.dst_card(dst) {
+				if let Some(src_card) = self.src_card(dst_tableau.src) {
+					match self.dst_card(dst_tableau.tableau) {
 						// destination card exists
 						Some(dst_card) => {
 							// red-ness is opposite?
@@ -457,10 +445,7 @@ pub struct KlondikeIter {
 impl KlondikeIter {
 	const fn new() -> Self {
 		Self {
-			instruction: Some(KlondikeInstruction {
-				src: InstructionSrc::new(KlondikePileStack::Tableau1(SkipCards::Skip0)),
-				dst: KlondikePileId::Tableau2,
-			}),
+			instruction: Some(KlondikeInstruction::ITER_BEGIN),
 		}
 	}
 }