From 3a78d6d6f725bffa414e27d2da82994eb1b357dd Mon Sep 17 00:00:00 2001
From: Pierre-Antoine Rouby <contact@parouby.fr>
Date: Thu, 11 Sep 2025 14:39:28 +0200
Subject: [PATCH] MainWindow: Create a study file copy in current dire before
 update.

---
 src/Model/Study.py     |  3 ++-
 src/View/MainWindow.py |  9 ++++++---
 src/tools.py           | 20 ++++++++++++++++++++
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/Model/Study.py b/src/Model/Study.py
index f5636241..6b96cc9e 100644
--- a/src/Model/Study.py
+++ b/src/Model/Study.py
@@ -37,6 +37,8 @@ logger = logging.getLogger()
 
 
 class Study(SQLModel):
+    _version = "0.2.0"
+
     _sub_classes = [
         Scenario,
         River,
@@ -44,7 +46,6 @@ class Study(SQLModel):
 
     def __init__(self, filename=None, init_new=True):
         # Metadata
-        self._version = "0.2.0"
         self.creation_date = datetime.now()
         self.last_modification_date = datetime.now()
         self.last_save_date = datetime.now()
diff --git a/src/View/MainWindow.py b/src/View/MainWindow.py
index 2e4ce1e7..b0d8a49e 100644
--- a/src/View/MainWindow.py
+++ b/src/View/MainWindow.py
@@ -31,7 +31,7 @@ from platformdirs import user_cache_dir
 
 from Solver.AdisTS import AdisTS
 from Solver.Mage import Mage8
-from tools import logger_exception
+from tools import logger_exception, pamhyr_db_need_update
 
 from PyQt5 import QtGui
 from PyQt5.QtGui import (
@@ -1087,10 +1087,13 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             dialog.setDirectory(os.path.dirname(self.conf.last_study))
 
             if dialog.exec_():
-                file_name = dialog.selectedFiles()
+                file_name = dialog.selectedFiles()[0]
+
+                if pamhyr_db_need_update(file_name, Study._version):
+                    shutil.copyfile(file_name, file_name + ".old")
 
                 def fn():
-                    self._tmp_study = Study.open(file_name[0])
+                    self._tmp_study = Study.open(file_name)
 
                 dlg = WaitingDialog(
                     payload_fn=fn,
diff --git a/src/tools.py b/src/tools.py
index 275eea6f..02a783de 100644
--- a/src/tools.py
+++ b/src/tools.py
@@ -19,6 +19,7 @@
 import os
 import time
 import logging
+import sqlite3
 import traceback
 
 from datetime import datetime, timedelta
@@ -456,3 +457,22 @@ def _parse_word_up_to_next_sep(words, sep=" "):
 
     rest = words[i+1:]
     return word, rest
+
+
+######
+# DB #
+######
+
+def pamhyr_db_need_update(db_file, expected_version):
+    db = sqlite3.connect(db_file, check_same_thread=False)
+    cur = db.cursor()
+
+    data = cur.execute(
+        "SELECT value FROM info WHERE key='version'"
+    ).fetchall()
+
+    db.close()
+    if len(data) == 0:
+        return True
+
+    return expected_version != data[0]