add Dataset Class and Tests

server/DatasetExporter.py

@@ -0,0 +1,64 @@
+import argparse
+import json
+from pathlib import Path
+
+
+class DatasetExporter:
+  def __init__(self, input_dir:str, output_file:str):
+    self.input_dir = Path(input_dir)
+    self.output_file = Path(output_file)
+
+  def _iter_game_files(self):
+    if not self.input_dir.exists():
+      return []
+    return sorted(self.input_dir.rglob("*.json"))
+
+  def _extract_samples(self, payload:dict, source_file:Path):
+    dataset = payload.get("dataset", {})
+    game_info = dataset.get("game", payload.get("game", {}))
+    snake_info = dataset.get("snake", payload.get("snake", {}))
+
+    samples = []
+    for sample in dataset.get("samples", []):
+      samples.append({
+        "game_id": game_info.get("id"),
+        "game_map": game_info.get("map"),
+        "game_type": game_info.get("type"),
+        "snake_type": snake_info.get("type"),
+        "turn": sample.get("turn"),
+        "move": sample.get("move"),
+        "is_good_move": sample.get("is_good_move", False),
+        "game_board": sample.get("game_board"),
+        "history": sample.get("history"),
+        "source_file": str(source_file),
+      })
+    return samples
+
+  def export_jsonl(self):
+    game_files = self._iter_game_files()
+    self.output_file.parent.mkdir(parents=True, exist_ok=True)
+
+    sample_count = 0
+    with self.output_file.open("w", encoding="utf-8") as output:
+      for game_file in game_files:
+        with game_file.open("r", encoding="utf-8") as source:
+          payload = json.load(source)
+
+        for sample in self._extract_samples(payload, game_file):
+          output.write(json.dumps(sample, ensure_ascii=False) + "\n")
+          sample_count += 1
+
+    return {
+      "games_scanned": len(game_files),
+      "samples_exported": sample_count,
+      "output_file": str(self.output_file),
+    }
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser(description="Export Battlesnake dataset to JSONL")
+  parser.add_argument("--input", default="data", help="Input directory with stored game JSON files")
+  parser.add_argument("--output", default="data/dataset/good_moves.jsonl", help="Output JSONL file")
+  args = parser.parse_args()
+
+  report = DatasetExporter(args.input, args.output).export_jsonl()
+  print(json.dumps(report, indent=2))