feat: complete sell

lib/ui/sell_page/view_model/sell_view_model.dart

@@ -50,14 +50,41 @@ class SellViewModel extends ChangeNotifier {
   List<BookStack> get scannedBooks => _scannedBooks;
 
   bool isScanLoaded = false;
+  bool isSendingSell = false;
+  double minimumAmount = 0;
 
   void sellBook(BookStack addedBook) {
+    minimumAmount += addedBook.instance.price;
     _soldBooks.add(addedBook);
     notifyListeners();
   }
 
-  void sendSell() {
+  void sendSell(double givenAmount) async {
+    isSendingSell = true;
+    notifyListeners();
+    List<BookInstance> toSend = [];
+    int nbOfPl = 0;
+    for (BookStack book in _soldBooks) {
+      if (book.instance.price != 0) {
+        book.instance.soldPrice = book.instance.price;
+        givenAmount -= book.instance.price;
+        toSend.add(book.instance);
+      } else {
+        nbOfPl++;
+      }
+    }
+    if (nbOfPl != 0) {
+      double amountPerPl = givenAmount / nbOfPl;
+      for (BookStack book in _soldBooks) {
+        if (book.instance.price == 0) {
+          book.instance.soldPrice = amountPerPl;
+          toSend.add(book.instance);
+        }
+      }
+    }
+    await _bookInstanceRepository.sellBooks(toSend);
     _soldBooks.clear();
+    isSendingSell = false;
     notifyListeners();
   }
 
@@ -75,6 +102,9 @@ class SellViewModel extends ChangeNotifier {
     switch (result) {
       case Ok():
         for (BookInstance instance in result.value) {
+          if (instance.available == false) {
+            continue;
+          }
           if (_soldBooks
               .where((book) => book.instance.id == instance.id)
               .isNotEmpty) {