From 88a93e9ed705f1fbe0047a663436ecf822b5b720 Mon Sep 17 00:00:00 2001
From: Michael Peters <michael@styx>
Date: Thu, 14 Mar 2024 21:57:44 -0700
Subject: [PATCH] add edge cross movement

---
 src/cube.rs |  8 ++++++++
 src/f2l.rs  | 46 +++++++++++++++++++++++++++++++++++-----------
 src/main.rs | 16 +++++++++++++---
 3 files changed, 56 insertions(+), 14 deletions(-)

diff --git a/src/cube.rs b/src/cube.rs
index b129a49..01d8173 100644
--- a/src/cube.rs
+++ b/src/cube.rs
@@ -173,6 +173,7 @@ impl Cube {
     //   D
 
     pub fn u(&mut self) {
+        print!("u");
         self.u.rotate();
         let (f_tr, f_tm, f_tl) = (self.f.tr, self.f.tm, self.f.tl);
         self.f.apply_t(self.r.tl, self.r.tm, self.r.tr);
@@ -182,6 +183,7 @@ impl Cube {
     }
 
     pub fn d(&mut self) {
+        print!("d");
         self.d.rotate();
         let (f_br, f_bm, f_bl) = (self.f.br, self.f.bm, self.f.bl);
         self.f.apply_b(self.l.br, self.l.bm, self.l.bl);
@@ -191,6 +193,7 @@ impl Cube {
     }
 
     pub fn l(&mut self) {
+        print!("l");
         self.l.rotate();
         let (f_tl, f_ml, f_bl) = (self.f.tl, self.f.ml, self.f.bl);
         self.f.apply_l(self.u.tl, self.u.ml, self.u.bl);
@@ -200,6 +203,7 @@ impl Cube {
     }
 
     pub fn r(&mut self) {
+        print!("r");
         self.r.rotate();
         let (f_tr, f_mr, f_br) = (self.f.tr, self.f.mr, self.f.br);
         self.f.apply_r(self.d.tr, self.d.mr, self.d.br);
@@ -209,6 +213,7 @@ impl Cube {
     }
 
     pub fn f(&mut self) {
+        print!("f");
         self.f.rotate();
         let (u_bl, u_bm, u_br) = (self.u.bl, self.u.bm, self.u.br);
         self.u.apply_b(self.l.br, self.l.mr, self.l.tr);
@@ -218,6 +223,7 @@ impl Cube {
     }
 
     pub fn b(&mut self) {
+        print!("b");
         self.b.rotate();
         let (u_tl, u_tm, u_tr) = (self.u.tl, self.u.tm, self.u.tr);
         self.u.apply_t(self.r.tr, self.r.mr, self.r.br);
@@ -232,6 +238,7 @@ impl Cube {
         self.u();
     }
 
+    #[allow(dead_code)]
     pub fn d2(&mut self) {
         self.d();
         self.d();
@@ -264,6 +271,7 @@ impl Cube {
         self.u();
     }
 
+    #[allow(dead_code)]
     pub fn dp(&mut self) {
         self.d();
         self.d();
diff --git a/src/f2l.rs b/src/f2l.rs
index c882303..1ca1a34 100644
--- a/src/f2l.rs
+++ b/src/f2l.rs
@@ -57,7 +57,7 @@ fn find_edge(c: &Cube, color_a: Color, color_b: Color) -> Option<(EdgeLoc, EdgeC
     EDGE_LOCS
         .iter()
         .map(|&el| (el, get_edge_color(&c, el)))
-        .find(|&(el, ec)| correct_ec(ec))
+        .find(|&(_el, ec)| correct_ec(ec))
 }
 
 #[rustfmt::skip]
@@ -103,17 +103,39 @@ fn move_white_edge_top(c: &mut Cube, el: EdgeLoc, ec: EdgeColor) -> EdgeLoc {
     }
 }
 
-fn move_edge_cross(c: &mut Cube, el: EdgeLoc, ec: EdgeColor) {}
-
-fn solve_cross_white_edge(c: &mut Cube, color: Color) {
-    // moves the white-<color> edge to the top of the cube with the white
-    // facing the U direction
-    let (el_start, ec) = find_edge(c, Color::W, color).expect("unable to find edge");
-    let el_top = move_white_edge_top(c, el_start, ec);
+#[rustfmt::skip]
+fn move_edge_cross(c: &mut Cube, el: EdgeLoc, color: Color) {
+    // F = G, B = B, L = R, R = O
+    let eli: i8 = match el {
+        EdgeLoc::UF => 0,
+        EdgeLoc::UB => 2,
+        EdgeLoc::UL => 3,
+        EdgeLoc::UR => 1,
+        _ => panic!("invalid edge location: {:?}", el),
+    };
+    let eci: i8 = match color {
+        Color::G => 0,
+        Color::B => 2,
+        Color::R => 3,
+        Color::O => 1,
+        _ => panic!("invalid edge color: {}", color),
+    };
+    let d = (eli - eci + 4) % 4;
+    match d {
+        0 => (),
+        1 => { c.u(); },
+        2 => { c.u2(); },
+        3 => { c.up(); },
+        _ => panic!("invalid d: {}", d)
+    }
 }
 
-fn solve_cross(_c: &mut Cube) {
-    for color in [Color::G, Color::B, Color::R, Color::O] {}
+pub fn solve_cross(c: &mut Cube) {
+    for color in [Color::G, Color::B, Color::R, Color::O] {
+        let (el_start, ec) = find_edge(c, Color::W, color).expect("unable to find edge");
+        let el_top = move_white_edge_top(c, el_start, ec);
+        move_edge_cross(c, el_top, color);
+    }
 }
 
 fn solve_f2l(_c: &mut Cube) {}
@@ -122,7 +144,9 @@ fn solve_oll(_c: &mut Cube) {}
 
 fn solve_pll(_c: &mut Cube) {}
 
-pub fn solve(_c: &mut Cube) {}
+pub fn solve(c: &mut Cube) {
+    solve_cross(c);
+}
 
 #[cfg(test)]
 mod tests {
diff --git a/src/main.rs b/src/main.rs
index 63ba0e6..5670ec1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,10 +5,20 @@ fn main() {
     let mut c = cube::Cube::new();
     println!("initial cube:\n{}", c);
 
-    let moves = cube::parse_moves("R U R' U R U2 R'").expect("unable to parse moves");
+    let moves = cube::parse_moves(
+        "R2 F' D' B D' B2 L' B2 R2 L2 F' B2 L' D B2 U' B' F' D' F2 D2 U' B2 D' B'",
+    )
+    .expect("unable to parse moves");
+
     cube::apply_moves(&mut c, moves);
 
-    f2l::solve(&mut c);
+    // TODO: scramble results are wrong
+    println!();
+    println!("after scramble:\n{}", c);
 
-    println!("after OLL:\n{}", c);
+    f2l::solve_cross(&mut c);
+
+    // TODO: cross is not solved
+    println!();
+    println!("after f2l:\n{}", c);
 }