Add: armor plates support with new database tables and loadout functionality

fix: only required mods are applied to guns for weight management.

app.py

@@ -357,7 +357,7 @@ def loadout():
     tab  = request.args.get("tab", "guns")
     sort = request.args.get("sort", "weight_asc")
 
-    guns = armor = helmets = headwear = backpacks = rigs = []
+    guns = armor = helmets = headwear = backpacks = rigs = plates = []
     builder_guns = builder_armor = builder_helmets = builder_rigs = builder_backpacks = []
     requires = request.args.getlist("requires")  # list of slot_nameids that must exist
     min_class    = request.args.get("min_class",    0, type=int)
@@ -443,6 +443,14 @@ def loadout():
             ORDER BY {sort_frag}
         """, (min_capacity, min_capacity, min_class, min_class)).fetchall()
 
+    elif tab == "plates":
+        plates = conn.execute(f"""
+            SELECT * FROM gear_items
+            WHERE category = 'plate'
+              AND (? = 0 OR armor_class >= ?)
+            ORDER BY {sort_frag}
+        """, (min_class, min_class)).fetchall()
+
     elif tab == "builder":
         builder_guns      = conn.execute("SELECT id, name, weight_kg FROM gear_items WHERE category='gun'      ORDER BY name").fetchall()
         builder_armor     = conn.execute("SELECT id, name, weight_kg FROM gear_items WHERE category='armor'    ORDER BY name").fetchall()
@@ -450,12 +458,16 @@ def loadout():
         builder_rigs      = conn.execute("SELECT id, name, weight_kg FROM gear_items WHERE category='rig'      ORDER BY name").fetchall()
         builder_backpacks = conn.execute("SELECT id, name, weight_kg FROM gear_items WHERE category='backpack' ORDER BY name").fetchall()
 
+    # IDs of carriers that have at least one open plate slot (shell weight only)
+    open_slot_rows = conn.execute("SELECT DISTINCT carrier_id FROM armor_open_slots").fetchall()
+    carrier_ids_with_open_slots = {row["carrier_id"] for row in open_slot_rows}
+
     conn.close()
     return render_template(
         "loadout.html",
         tab=tab, sort=sort,
         guns=guns, armor=armor, helmets=helmets, headwear=headwear,
-        backpacks=backpacks, rigs=rigs,
+        backpacks=backpacks, rigs=rigs, plates=plates,
         slot_filters=LOADOUT_SLOT_FILTERS,
         requires=requires,
         min_class=min_class, min_capacity=min_capacity,
@@ -464,6 +476,7 @@ def loadout():
         builder_helmets=builder_helmets,
         builder_rigs=builder_rigs,
         builder_backpacks=builder_backpacks,
+        carrier_ids_with_open_slots=carrier_ids_with_open_slots,
     )
 
 
@@ -506,17 +519,19 @@ def gun_detail(gun_id):
         if row["mod_id"]:
             slots[sid]["mods"].append(dict(row))
 
-    # Key slots to show at top (highlighted)
+    # Split into required vs optional slots
     KEY_SLOTS = {"mod_muzzle", "mod_magazine"}
     ordered_slots = [slots[s] for s in slot_order]
-    key_slots   = [s for s in ordered_slots if s["slot_nameid"] in KEY_SLOTS]
-    other_slots = [s for s in ordered_slots if s["slot_nameid"] not in KEY_SLOTS]
+    # Required slots (always needed) shown at top — key slots (magazine/muzzle) highlighted
+    key_slots      = [s for s in ordered_slots if s["required"] and s["slot_nameid"] in KEY_SLOTS]
+    req_slots      = [s for s in ordered_slots if s["required"] and s["slot_nameid"] not in KEY_SLOTS]
+    optional_slots = [s for s in ordered_slots if not s["required"]]
 
-    # Lightest total (base + lightest per slot)
+    # Lightest total (base + lightest per REQUIRED slot only)
     lightest_total = (gun["weight_kg"] or 0) + sum(
         s["mods"][0]["weight_kg"]
         for s in ordered_slots
-        if s["mods"] and s["mods"][0]["weight_kg"] is not None
+        if s["required"] and s["mods"] and s["mods"][0]["weight_kg"] is not None
     )
 
     conn.close()
@@ -524,7 +539,8 @@ def gun_detail(gun_id):
         "gun_detail.html",
         gun=gun,
         key_slots=key_slots,
-        other_slots=other_slots,
+        req_slots=req_slots,
+        optional_slots=optional_slots,
         lightest_total=lightest_total,
     )
 
@@ -571,6 +587,45 @@ def gun_slots_json(gun_id):
     return jsonify(result)
 
 
+@app.route("/loadout/carrier/<carrier_id>/slots.json")
+def carrier_slots_json(carrier_id):
+    """Returns open plate slots and allowed plates for a carrier (armor or rig)."""
+    conn = get_db()
+    rows = conn.execute("""
+        SELECT aos.slot_nameid, aos.zones,
+               p.id AS plate_id, p.name AS plate_name, p.short_name AS plate_short,
+               p.weight_kg, p.armor_class, p.durability, p.material
+        FROM armor_open_slots aos
+        LEFT JOIN armor_slot_plates asp ON asp.carrier_id = aos.carrier_id
+            AND asp.slot_nameid = aos.slot_nameid
+        LEFT JOIN gear_items p ON p.id = asp.plate_id
+        WHERE aos.carrier_id = ?
+        ORDER BY aos.slot_nameid, p.armor_class DESC, p.weight_kg ASC
+    """, (carrier_id,)).fetchall()
+    conn.close()
+
+    # Group by slot
+    slots = {}
+    slot_order = []
+    for row in rows:
+        sn = row["slot_nameid"]
+        if sn not in slots:
+            slots[sn] = {"slot_nameid": sn, "zones": row["zones"], "plates": []}
+            slot_order.append(sn)
+        if row["plate_id"]:
+            slots[sn]["plates"].append({
+                "id":         row["plate_id"],
+                "name":       row["plate_name"],
+                "short_name": row["plate_short"],
+                "weight_kg":  row["weight_kg"],
+                "armor_class": row["armor_class"],
+                "durability": row["durability"],
+                "material":   row["material"],
+            })
+
+    return jsonify([slots[s] for s in slot_order])
+
+
 @app.route("/loadout/save-build", methods=["POST"])
 def save_build():
     data = request.get_json() or {}