Add "best" subcommand to CLI to invoke AI core

fish/src/bin/cli.rs

@@ -72,7 +72,7 @@ fn main() -> anyhow::Result<()> {
     let args = <Args as clap::Parser>::parse();
     match args.cmd {
         Cmd::List(_) => list_moves(),
-        Cmd::Best(_) => Err(anyhow!("'best' command is not implemented")),
+        Cmd::Best(cmd) => print_best_move(cmd.settings),
         Cmd::Play(_) => Err(anyhow!("'play' command is not implemented")),
     }
 }
@@ -102,3 +102,41 @@ fn list_moves() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+fn print_best_move(_settings: Settings) -> anyhow::Result<()> {
+    let input: fish::io::InputState =
+        serde_json::from_reader(std::io::stdin()).context("error parsing input state")?;
+
+    let mut mat = input.matrix.to_mat();
+    mat.clear_lines();
+
+    // TODO: ai init config, e.g. personality
+    let mut ai = fish::Ai::new();
+
+    // TODO: hold
+    // TODO: attack state
+    ai.start(&mat, &input.queue.previews, input.queue.hold);
+
+    // TODO: resource limits (cycles,nodes,time)
+    loop {
+        if ai.think_1_cycle() {
+            break;
+        }
+        // TODO: proper logging
+        // eprintln!("thinking...");
+    }
+
+    // print suggestions trace
+    let mut output = fish::io::OutputMoves::default();
+    for pc in ai.suggestion() {
+        output.moves.push(fish::io::OutputMove {
+            location: pc.into(),
+            // TODO: spin suggestions
+            spin: fish::io::Spin::None,
+        });
+    }
+
+    serde_json::to_writer(std::io::stdout(), &output).context("error writing output state")?;
+    println!();
+    Ok(())
+}