From 6a780efa4a3ac02529baaee9a69899a38c624456 Mon Sep 17 00:00:00 2001
From: Greg Shuflin <greg.shuflin@protonmail.com>
Date: Mon, 20 Sep 2021 22:50:12 -0700
Subject: [PATCH] Basic Tetris gameplay working

---
 iced-tetris/src/main.rs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/iced-tetris/src/main.rs b/iced-tetris/src/main.rs
index 5ffef32..15b64ac 100644
--- a/iced-tetris/src/main.rs
+++ b/iced-tetris/src/main.rs
@@ -18,6 +18,7 @@ struct Tetris {
     blocks: BlockGrid,
     ticks: usize,
     paused: bool,
+    lines_removed: u32,
 }
 
 impl Tetris {
@@ -27,6 +28,7 @@ impl Tetris {
             blocks: BlockGrid::new(),
             ticks: 0,
             paused: false,
+            lines_removed: 0,
         }
     }
 }
@@ -77,6 +79,9 @@ impl Application for Tetris {
                 }
             }
         };
+
+        let lines_removed = self.blocks.clear_pieces();
+        self.lines_removed += lines_removed;
         Command::none()
     }
 
@@ -344,6 +349,39 @@ impl BlockGrid {
         }
     }
 
+    /// Returns number of lines removed
+    fn clear_pieces(&mut self) -> u32 {
+      let mut new_state = [[None; 20]; 10];
+      let mut offset = 0;
+      for row in (0..=19).rev() {
+        let mut all_filled = true;
+        let mut all_empty = true;
+        for col in 0..10 {
+          if self.state[col][row].is_none() {
+            all_filled = false;
+          }
+          if self.state[col][row].is_some() {
+            all_empty = false;
+          }
+        }
+
+        if all_filled && !all_empty {
+          offset += 1;
+        } else {
+          if offset != 0 {
+            println!("Offset {} row {}", offset, row);
+          }
+          for col in 0..10 {
+            new_state[col][row+offset] = self.state[col][row];
+          }
+        }
+      }
+
+      self.state = new_state;
+      println!("OFFSET: {}", offset);
+      offset as u32
+    }
+
     fn iter<'a>(&'a self) -> BlockGridIter<'a> {
         let active_piece_blocks = self.active_piece.as_ref().map(|piece| {
             let b = Self::piece_blocks(piece);