more chnages

app/template_generator.py

@@ -25,6 +25,7 @@ from template_controller import build_schedule  # noqa: E402
 from conflict_checker import check_all_conflicts  # noqa: E402
 from conflict_checker.student_conflict_checker import format_student_conflicts  # noqa: E402
 from conflict_checker.teacher_conflict_checker import format_teacher_conflicts  # noqa: E402
+from template_logger import reset_log, log_error, log_info  # noqa: E402
 
 from batch_wise_template import generate_batch_wise_templates  # noqa: E402
 from department_wise_template import generate_department_wise_templates  # noqa: E402
@@ -36,6 +37,8 @@ RESULT_DIR = os.path.join(ROOT_DIR, "result", "templates")
 
 
 def main():
+    reset_log()
+
     data_csv_marker = os.path.join(ROOT_DIR, "data", "dummy", "blocks", "rooms.csv")
     if not os.path.exists(data_csv_marker):
         print("Dummy data not found — generating it first...")
@@ -48,19 +51,19 @@ def main():
     data, sessions = build_schedule()
     print(f"Scheduled {len(sessions)} sessions.\n")
 
-    print("Running conflict checks (student/batch and teacher)...")
+    log_info("Running conflict checks (student/batch and teacher)...")
     report = check_all_conflicts(sessions)
     if report["has_conflicts"]:
         for line in format_student_conflicts(report["student_conflicts"]):
-            print(f"  STUDENT CONFLICT: {line}")
+            log_error(f"STUDENT CONFLICT: {line}")
         for line in format_teacher_conflicts(report["teacher_conflicts"]):
-            print(f"  TEACHER CONFLICT: {line}")
-        print(
+            log_error(f"TEACHER CONFLICT: {line}")
+        log_error(
             f"Found {len(report['student_conflicts'])} student conflict(s) and "
-            f"{len(report['teacher_conflicts'])} teacher conflict(s).\n"
+            f"{len(report['teacher_conflicts'])} teacher conflict(s)."
         )
     else:
-        print("No conflicts found — schedule is clash-free for students and teachers.\n")
+        log_info("No conflicts found — schedule is clash-free for students and teachers.")
 
     generators = [
         ("batch-wise", generate_batch_wise_templates),

app/template_logger.py

@@ -0,0 +1,48 @@
+"""
+Simple run-scoped logger for the template generator.
+
+The log file under logs/ is erased and recreated at the start of every run
+(see reset_log()) so it only ever reflects the most recent generation.
+"""
+
+import datetime
+import os
+
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+LOGS_DIR = os.path.join(ROOT_DIR, "logs")
+LOG_FILE = os.path.join(LOGS_DIR, "template_generator.log")
+
+_log_path = None
+
+
+def reset_log():
+    """Erases any previous log and starts a fresh one for this run."""
+    global _log_path
+    os.makedirs(LOGS_DIR, exist_ok=True)
+    _log_path = LOG_FILE
+    with open(_log_path, "w", encoding="utf-8") as f:
+        f.write(f"Timetable generation log - started {datetime.datetime.now().isoformat()}\n")
+        f.write("=" * 80 + "\n")
+    return _log_path
+
+
+def log_error(message):
+    """Appends an ERROR line to the current run's log file and prints it."""
+    _write("ERROR", message)
+
+
+def log_warning(message):
+    _write("WARNING", message)
+
+
+def log_info(message):
+    _write("INFO", message)
+
+
+def _write(level, message):
+    if _log_path is None:
+        reset_log()
+    line = f"[{datetime.datetime.now().strftime('%H:%M:%S')}] {level}: {message}"
+    with open(_log_path, "a", encoding="utf-8") as f:
+        f.write(line + "\n")
+    print(line)