7 files changed, 59 insertions, 6 deletions

diff --git a/.cache/clangd/index/main.c.B35546292B5EA1F4.idx b/.cache/clangd/index/main.c.B35546292B5EA1F4.idx
index a5094ec..02a1be3 100644
--- a/.cache/clangd/index/main.c.B35546292B5EA1F4.idx
+++ b/.cache/clangd/index/main.c.B35546292B5EA1F4.idx
diff --git a/.cache/clangd/index/ring.h.D0AA315870801682.idx b/.cache/clangd/index/ring.h.D0AA315870801682.idx
index acdc302..304b0bb 100644
--- a/.cache/clangd/index/ring.h.D0AA315870801682.idx
+++ b/.cache/clangd/index/ring.h.D0AA315870801682.idx
diff --git a/.gitignore b/.gitignore
index 16d3c4d..490cac5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .cache
+.cache/*
diff --git a/src/main.c b/src/main.c
index 54d375f..4039aa3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -84,6 +84,26 @@ void draw_body() {
 	mvprintw(getcury(wmain)+1, 10, " ======= ");
 	mvprintw(getcury(wmain)+1, 10, "---------");
 	*/
+
+	// DEBUG
+	mvprintw(0, 0, "tower 1: %c %c %c", (towers[0].rings[0] ? 'X' : '_'), (towers[0].rings[1] ? 'X' : '_'), (towers[0].rings[2] ? 'X' : '_'));
+	mvprintw(1, 0, "tower 2: %c %c %c", (towers[1].rings[0] ? 'X' : '_'), (towers[1].rings[1] ? 'X' : '_'), (towers[1].rings[2] ? 'X' : '_'));
+	mvprintw(2, 0, "tower 3: %c %c %c", (towers[2].rings[0] ? 'X' : '_'), (towers[2].rings[1] ? 'X' : '_'), (towers[2].rings[2] ? 'X' : '_'));
+	mvprintw(3, 0, "ring 1:");
+	mvprintw(4, 2, "location: %d", rings[0].location);
+	mvprintw(5, 2, "held:     %d", rings[0].held);
+	mvprintw(6, 2, "size:     %d", rings[0].size);
+	mvprintw(7, 2, "ascii:    %s", rings[0].ascii);
+	mvprintw(8, 0, "ring 2:");
+	mvprintw(9, 2, "location: %d", rings[1].location);
+	mvprintw(10, 2, "held:     %d", rings[1].held);
+	mvprintw(11, 2, "size:     %d", rings[1].size);
+	mvprintw(12, 2, "ascii:    %s", rings[1].ascii);
+	mvprintw(13, 0, "ring 3:");
+	mvprintw(14, 2, "location: %d", rings[2].location);
+	mvprintw(15, 2, "held:     %d", rings[2].held);
+	mvprintw(16, 2, "size:     %d", rings[2].size);
+	mvprintw(17, 2, "ascii:    %s", rings[2].ascii);
 }
 
 void draw_tower(int ring_index, int startx, int starty) {
@@ -136,12 +156,18 @@ void input_loop() {
 
 			// pickup a ring
 			case ' ': // spacebar
-				// TODO check if a ring is already held, in which case we need to do something else
-				pickup_ring();
-				draw_body();
-				wrefresh(wbody);
+				if(held == NULL) {
+					pickup_ring();
+					draw_body();
+					wrefresh(wbody);
+				}
+				else {
+					if(drop_ring()) {
+						draw_body();
+						wrefresh(wbody);
+					}
+				}
 				break;
-
 		}
 	}
 }
diff --git a/src/ring.c b/src/ring.c
index 633648b..e73d477 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -19,8 +19,28 @@ void pickup_ring() {
 		}
 	}
 
-	if(pickup > 0) {
+	if(pickup >= 0) {
 		held = &rings[pickup];
 		held->held = true;
+		towers[hover].rings[pickup] = false;
 	}
 }
+
+bool drop_ring() {
+	int i;
+
+	// should not be called if we are not holding a ring
+	assert(held != NULL);
+
+	//determine if we are allowed to drop the ring here
+	for(i = 2; i > held->size; --i) {
+		if(towers[held->location].rings[i]) {
+			return false;
+		}
+	}
+
+	held->held = false;
+	towers[held->location].rings[i] = true;
+	held = NULL;
+	return true;
+}
diff --git a/src/ring.h b/src/ring.h
index 0b23bf1..0e146ff 100644
--- a/src/ring.h
+++ b/src/ring.h
@@ -14,5 +14,6 @@ extern Ring rings[3];
 extern Ring *held;
 
 void pickup_ring();
+bool drop_ring();
 
 #endif
diff --git a/src/tower.c b/src/tower.c
index 9220db2..6dcbc9a 100644
--- a/src/tower.c
+++ b/src/tower.c
@@ -1,3 +1,6 @@
+#include <stdlib.h>
+
+#include "ring.h"
 #include "tower.h"
 
 int hover_max = 2;
@@ -5,9 +8,11 @@ int hover_max = 2;
 void hover_move_right() {
 	++hover;
 	if(hover > hover_max) hover = hover_max;
+	if(held != NULL) held->location = hover;
 }
 
 void hover_move_left() {
 	--hover;
 	if(hover < 0) hover = 0;
+	if(held != NULL) held->location = hover;
 }