Add uci movetime, hash and initialize TT based on size in MBs

src/search/transposition_table.rs

@@ -1,5 +1,7 @@
 use crate::{board::zobrist::ZobristHash, movegen::r#move::Move};
 
+use super::TT_SIZE_IN_MB;
+
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct TranspositionTable {
     positions: Vec<Option<TTEntry>>,
@@ -7,10 +9,17 @@ pub struct TranspositionTable {
 }
 
 impl TranspositionTable {
-    pub fn new(size: u64) -> Self {
+    pub fn new() -> Self {
+        Self::new_with_mb_size(TT_SIZE_IN_MB)
+    }
+
+    pub fn new_with_mb_size(size_in_mega_bytes: usize) -> Self {
+        let size_in_bytes = size_in_mega_bytes * 1024 * 1024;
+        let num_of_entries = size_in_bytes / std::mem::size_of::<TTEntry>();
+
         Self {
-            positions: vec![None; size as usize],
-            size,
+            positions: vec![None; num_of_entries],
+            size: num_of_entries as u64,
         }
     }
 
@@ -66,7 +75,7 @@ mod tests {
         board::fen::from_fen,
         evaluation::{MAX_SCORE, MIN_SCORE},
         movegen::attack_generator::init_attacks,
-        search::{negamax::negamax, time::TimeInfo},
+        search::{negamax::negamax, time::TimeInfo, INC, TIME},
     };
 
     const FEN: &str = "1r2k2r/2P1pq1p/2npb3/1p3ppP/p3P3/P2B1Q2/1P1PNPP1/R3K2R w KQk g6 0 1";
@@ -77,10 +86,10 @@ mod tests {
     fn test_transposition_table() -> anyhow::Result<()> {
         init_attacks();
         let mut game = from_fen(FEN).unwrap();
-        let time_info = TimeInfo::new(std::time::Instant::now(), 30000, 100);
+        let time_info = TimeInfo::new(std::time::Instant::now(), TIME, INC);
 
         negamax(
-            &mut game, MIN_SCORE, MAX_SCORE, 2, 0, &time_info, &mut 0, true,
+            &mut game, MIN_SCORE, MAX_SCORE, 3, 0, &time_info, &mut 0, true,
         )
         .expect("Expected a search result");