From 73d2077d6772ab819cdd624ee9f0be304a4a48be Mon Sep 17 00:00:00 2001
From: Richard Schreiber <schreiber@rami.io>
Date: Fri, 2 Jun 2023 09:14:03 +0200
Subject: [PATCH] respect existing items in cart for order_min

---
 .../templates/pretixpresale/event/fragment_cart.html        | 2 +-
 src/pretix/static/pretixpresale/js/ui/main.js               | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
index 24210626a2..6291ed6314 100644
--- a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
+++ b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
@@ -21,7 +21,7 @@
     </div>
     <div role="rowgroup" class="firstchild-in-panel">
     {% for line in cart.positions %}
-        <div role="row" class="row cart-row {% if hide_prices %}hide-prices{% endif %} {% if download %}has-downloads{% endif %}{% if editable %}editable{% endif %}">
+        <div role="row" class="row cart-row {% if hide_prices %}hide-prices{% endif %} {% if download %}has-downloads{% endif %}{% if editable %}editable{% endif %}" data-item="{{ line.item.id }}" data-count="{{ line.count }}">
             <div role="cell" class="product">
                 <p>
                 {% if line.addon_to %}
diff --git a/src/pretix/static/pretixpresale/js/ui/main.js b/src/pretix/static/pretixpresale/js/ui/main.js
index 6b5d43229e..7982c1de8a 100644
--- a/src/pretix/static/pretixpresale/js/ui/main.js
+++ b/src/pretix/static/pretixpresale/js/ui/main.js
@@ -130,6 +130,12 @@ var form_handlers = function (el) {
     }).on("change", function(e) {
         var quantity = parseFloat(this.value) || 0;
         var itemOrderMin = parseFloat(this.getAttribute("data-min")) || 0;
+        if (itemOrderMin) {
+            document.querySelectorAll(".cart-row[data-item='"+this.id.substring(5)+"']").forEach(function(row) {
+                itemOrderMin -= (parseFloat(row.getAttribute("data-count")) || 1)
+            });
+            if (itemOrderMin < 0) itemOrderMin = 0;
+        }
         if (quantity && quantity < itemOrderMin) {
             this.value = this.previousValue > quantity ? 0 : itemOrderMin;
         }