Feat: Referral/Gründer-Rabatt in Rechnungssystem integriert (Discount-Badge, Auto-Vorausfüllung)

backend/routes/admin.py

@@ -1137,13 +1137,28 @@ async def list_upgrade_requests(user=Depends(require_admin)):
     with db() as conn:
         rows = conn.execute("""
             SELECT r.id, r.user_id, r.tier, r.message, r.created_at, r.fulfilled_at,
-                   u.name, u.email, u.billing_address
+                   u.name, u.email, u.billing_address,
+                   u.is_founder, u.is_founder_pending, u.referred_by,
+                   COALESCE((SELECT COUNT(*) FROM users WHERE referred_by=u.id), 0) AS referral_count
             FROM upgrade_requests r
             JOIN users u ON u.id = r.user_id
             ORDER BY r.fulfilled_at IS NOT NULL, r.created_at DESC
             LIMIT 100
         """).fetchall()
-    return [dict(r) for r in rows]
+        result = []
+        for r in rows:
+            d = dict(r)
+            d_info = _get_discount_info(conn, r["user_id"])
+            d["discount_pct"]    = d_info["discount_pct"]
+            d["discount_reason"] = d_info["reason"]
+            result.append(d)
+    return result
+
+
+@router.get("/users/{user_id}/discount")
+def get_user_discount(user_id: int, admin=Depends(require_admin)):
+    with db() as conn:
+        return _get_discount_info(conn, user_id)
 
 
 @router.post("/upgrade-requests/{req_id}/fulfill")
@@ -1268,6 +1283,35 @@ async def fulfill_upgrade_request(req_id: int, user=Depends(require_admin)):
     return {"ok": True, "tier": req["tier"], "user": req["name"]}
 
 
+def _get_discount_info(conn, user_id: int) -> dict:
+    """Berechnet Rabatt für einen User basierend auf Gründer-Status und Referrals."""
+    row = conn.execute(
+        """SELECT u.is_founder, u.is_founder_pending, u.referred_by,
+                  COALESCE((SELECT COUNT(*) FROM users WHERE referred_by=u.id), 0) AS referral_count
+           FROM users u WHERE u.id=?""",
+        (user_id,)
+    ).fetchone()
+    if not row:
+        return {"discount_pct": 0, "reason": None, "referral_count": 0}
+
+    if row["is_founder"] or row["is_founder_pending"]:
+        return {"discount_pct": 100, "reason": "founder", "referral_count": row["referral_count"]}
+
+    referred_by = row["referred_by"] or 0
+    if referred_by > 0:
+        referrer = conn.execute(
+            "SELECT is_founder, is_founder_pending FROM users WHERE id=?", (referred_by,)
+        ).fetchone()
+        if referrer and (referrer["is_founder"] or referrer["is_founder_pending"]):
+            return {"discount_pct": 50, "reason": "referred_by_founder", "referral_count": row["referral_count"]}
+
+    count = row["referral_count"]
+    for threshold, pct in [(50, 50), (20, 30), (10, 20)]:
+        if count >= threshold:
+            return {"discount_pct": pct, "reason": "referral", "referral_count": count}
+    return {"discount_pct": 0, "reason": None, "referral_count": count}
+
+
 async def _handle_upgrade_invoices(req: dict, new_tier_label: str):
     """Storniert offene Rechnungen des alten Tiers und legt neuen Entwurf an."""
     from routes.invoices import _next_invoice_number
@@ -1302,17 +1346,31 @@ async def _handle_upgrade_invoices(req: dict, new_tier_label: str):
         ).fetchone()
         billing_address = billing["billing_address"] if billing else None
 
+        disc_info    = _get_discount_info(conn, req["user_id"])
+        discount_pct = disc_info["discount_pct"]
+        discount_amt = round(price * discount_pct / 100, 2)
+        after_disc   = round(price - discount_amt, 2)
+
+        _AGB = "Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen."
+        if disc_info["reason"] == "founder":
+            note = f"Gründer-Sonderkonditionen: {new_tier_label} kostenfrei als Dankeschön für deine Unterstützung als Gründer! {_AGB}"
+        elif disc_info["reason"] == "referred_by_founder":
+            note = f"Willkommen in der Gründer-Community! Als persönlich von einem Gründer eingeladenes Mitglied erhältst du dauerhaft {discount_pct}% Rabatt. {_AGB}"
+        elif disc_info["reason"] == "referral":
+            note = f"Herzlichen Dank für deine Unterstützung! Für {disc_info['referral_count']} geworbene Freunde erhältst du {discount_pct}% Rabatt. {_AGB}"
+        else:
+            note = f"{_AGB} (Upgrade von {req.get('old_tier','Standard')} auf {new_tier_label})"
+
         inv_number = _next_invoice_number(conn)
         conn.execute("""
             INSERT INTO invoices
                 (invoice_number, user_id, recipient_name, recipient_email, recipient_address,
                  description, service_period, amount_net, discount_pct, discount_amount,
                  amount_after_discount, tax_rate, tax_amount, amount_gross, notes)
-            VALUES (?,?,?,?,?,?,?,?,0,0,?,0,0,?,?)
+            VALUES (?,?,?,?,?,?,?,?,?,?,?,0,0,?,?)
         """, (
             inv_number, req["user_id"], req["name"], req["email"], billing_address,
-            description, period, price, price, price,
+            description, period, price, discount_pct, discount_amt, after_disc, after_disc, note,
-            f"Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen. (Upgrade von {req.get('old_tier','Standard')} auf {new_tier_label})",
         ))
         invoice_id = conn.execute("SELECT last_insert_rowid()").fetchone()[0]
         conn.execute(

backend/scheduler.py

@@ -246,6 +246,49 @@ async def _create_renewal_invoice_draft(user: dict, expires: date, tier_label: s
         ).fetchone()
         billing_address = row["billing_address"] if row else None
 
+        # Rabatt berechnen (inline, da kein Admin-Import möglich)
+        disc_row = conn.execute(
+            """SELECT u.is_founder, u.is_founder_pending, u.referred_by,
+                      COALESCE((SELECT COUNT(*) FROM users WHERE referred_by=u.id), 0) AS referral_count
+               FROM users u WHERE u.id=?""",
+            (user["id"],)
+        ).fetchone()
+        discount_pct = 0
+        discount_reason = None
+        referral_count = 0
+        if disc_row:
+            referral_count = disc_row["referral_count"]
+            if disc_row["is_founder"] or disc_row["is_founder_pending"]:
+                discount_pct = 100
+                discount_reason = "founder"
+            elif (disc_row["referred_by"] or 0) > 0:
+                ref = conn.execute(
+                    "SELECT is_founder, is_founder_pending FROM users WHERE id=?",
+                    (disc_row["referred_by"],)
+                ).fetchone()
+                if ref and (ref["is_founder"] or ref["is_founder_pending"]):
+                    discount_pct = 50
+                    discount_reason = "referred_by_founder"
+            if not discount_reason:
+                for thr, pct in [(50, 50), (20, 30), (10, 20)]:
+                    if referral_count >= thr:
+                        discount_pct = pct
+                        discount_reason = "referral"
+                        break
+
+        discount_amt = round(price * discount_pct / 100, 2)
+        after_disc   = round(price - discount_amt, 2)
+
+        _AGB = "Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen."
+        if discount_reason == "founder":
+            notes = f"Gründer-Sonderkonditionen: {tier_label} kostenfrei als Dankeschön für deine Unterstützung als Gründer! {_AGB} (Automatisch erstellt, Ablauf: {expires.strftime('%d.%m.%Y')})"
+        elif discount_reason == "referred_by_founder":
+            notes = f"Willkommen in der Gründer-Community! Als persönlich von einem Gründer eingeladenes Mitglied erhältst du dauerhaft {discount_pct}% Rabatt. {_AGB} (Automatisch erstellt, Ablauf: {expires.strftime('%d.%m.%Y')})"
+        elif discount_reason == "referral":
+            notes = f"Herzlichen Dank für deine Unterstützung! Für {referral_count} geworbene Freunde erhältst du {discount_pct}% Rabatt. {_AGB} (Automatisch erstellt, Ablauf: {expires.strftime('%d.%m.%Y')})"
+        else:
+            notes = f"{_AGB} (Automatisch erstellt, Ablauf: {expires.strftime('%d.%m.%Y')})"
+
         invoice_number = _next_invoice_number(conn)
         description    = f"{tier_label} Jahresabo (Verlängerung)"
         conn.execute("""
@@ -253,12 +296,11 @@ async def _create_renewal_invoice_draft(user: dict, expires: date, tier_label: s
                 (invoice_number, user_id, recipient_name, recipient_email, recipient_address,
                  description, service_period, amount_net, discount_pct, discount_amount,
                  amount_after_discount, tax_rate, tax_amount, amount_gross, notes)
-            VALUES (?,?,?,?,?,?,?,?,0,0,?,0,0,?,?)
+            VALUES (?,?,?,?,?,?,?,?,?,?,?,0,0,?,?)
         """, (
             invoice_number, user["id"], user["name"], user["email"], billing_address,
             description, period,
-            price, price, price,
+            price, discount_pct, discount_amt, after_disc, after_disc, notes,
-            f"Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen. (Automatisch erstellt, Ablauf: {expires.strftime('%d.%m.%Y')})",
         ))
         conn.execute(
             "INSERT INTO invoice_items (invoice_id, description, quantity, unit_price, total) VALUES (?,?,1,?,?)",

backend/static/js/pages/admin.js

@@ -3531,8 +3531,14 @@ window.Page_admin = (() => {
             <div style="font-size:var(--text-xs);color:var(--c-text-muted);margin-bottom:var(--space-2)">${_esc(r.email)}</div>
             <div style="display:flex;align-items:center;gap:var(--space-2);flex-wrap:wrap">
               ${tierBadge(r.tier)}
+              ${r.discount_pct > 0 ? `<span style="display:inline-block;padding:1px 8px;border-radius:999px;
+  font-size:11px;font-weight:700;background:#e67e22;color:#fff;margin-left:4px">
+  ${r.discount_pct}% Rabatt</span>` : ''}
               <span style="font-size:var(--text-xs);color:var(--c-text-muted)">${r.created_at?.slice(0,10) || ''}</span>
             </div>
+            ${r.discount_reason === 'founder' ? `<div style="font-size:10px;color:#e67e22;margin-top:2px">Gründer — kostenfrei</div>` : ''}
+            ${r.discount_reason === 'referred_by_founder' ? `<div style="font-size:10px;color:#e67e22;margin-top:2px">Von Gründer eingeladen</div>` : ''}
+            ${r.discount_reason === 'referral' ? `<div style="font-size:10px;color:var(--c-text-muted);margin-top:2px">${r.referral_count} Freunde geworben</div>` : ''}
             ${r.message ? `<div style="margin-top:var(--space-2);font-size:var(--text-xs);color:var(--c-text-secondary);
                                        padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);
                                        background:var(--c-surface-raised,rgba(0,0,0,.04))">
@@ -3544,6 +3550,9 @@ window.Page_admin = (() => {
           <button class="btn adm-invoice-btn"
                   data-name="${_esc(r.name)}" data-email="${_esc(r.email)}"
                   data-tier="${r.tier}" data-address="${_esc(r.billing_address || '')}"
+                  data-discount="${r.discount_pct || 0}"
+                  data-discount-reason="${r.discount_reason || ''}"
+                  data-referral-count="${r.referral_count || 0}"
                   style="background:#e67e22;color:#fff;border:none;
                          padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);
                          cursor:pointer;font-size:var(--text-sm);font-weight:600">
@@ -3632,9 +3641,20 @@ window.Page_admin = (() => {
     const _fmt   = d => `${String(d.getDate()).padStart(2,'0')}.${String(d.getMonth()+1).padStart(2,'0')}.${d.getFullYear()}`;
     const _period = `${_fmt(_now)} – ${_fmt(_end)}`;
 
+    function _discountNote(reason, count, pct, tierLabel) {
+      const agb = 'Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen.';
+      if (reason === 'founder') return `Gründer-Sonderkonditionen: ${tierLabel} kostenfrei als Dankeschön für deine Unterstützung als Gründer! ${agb}`;
+      if (reason === 'referred_by_founder') return `Willkommen in der Gründer-Community! Als persönlich von einem Gründer eingeladenes Mitglied erhältst du dauerhaft ${pct}% Rabatt. ${agb}`;
+      if (reason === 'referral') return `Herzlichen Dank für deine Unterstützung! Für ${count} geworbene Freunde erhältst du ${pct}% Rabatt. ${agb}`;
+      return agb;
+    }
+
     el.querySelectorAll('.adm-invoice-btn').forEach(btn => {
       btn.addEventListener('click', () => {
         const { name, email, tier, address } = btn.dataset;
+        const discountPct    = Number(btn.dataset.discount) || 0;
+        const discountReason = btn.dataset.discountReason || '';
+        const referralCount  = Number(btn.dataset.referralCount) || 0;
         const tierItem = TIER_ITEMS[tier] || { description: 'Ban Yaro Abo', unit_price: 0 };
         _openNeueRechnungModal(() => {
           _tab = 'rechnungen';
@@ -3644,8 +3664,9 @@ window.Page_admin = (() => {
           recipient_email:   email,
           recipient_address: address || '',
           service_period:    _period,
+          discount_pct:      discountPct,
+          notes:             _discountNote(discountReason, referralCount, discountPct, tierItem.description),
           items: [{ description: tierItem.description, quantity: 1, unit_price: tierItem.unit_price }],
-          notes: 'Jahresbeitrag gem. AGB. Bei vorzeitiger Kündigung keine anteilige Rückerstattung; Zugang bleibt bis Laufzeitende bestehen.',
         });
       });
     });
@@ -3913,7 +3934,7 @@ window.Page_admin = (() => {
           <div style="display:grid;grid-template-columns:auto 1fr;gap:var(--space-3);align-items:center">
             <div style="display:flex;align-items:center;gap:var(--space-2)">
               <label class="form-label" style="font-size:var(--text-xs);margin:0;white-space:nowrap">Rabatt %</label>
-              <input class="form-control" name="discount_pct" type="number" min="0" max="100" value="0"
+              <input class="form-control" name="discount_pct" type="number" min="0" max="100" value="${p.discount_pct ?? 0}"
                      style="width:80px" id="${id}-discount">
             </div>
             <!-- Live-Vorschau -->
@@ -3927,7 +3948,7 @@ window.Page_admin = (() => {
             <label class="form-label" style="font-size:var(--text-xs)">Notizen <span style="color:var(--c-text-muted)">(optional)</span></label>
             <textarea class="form-control" name="notes" rows="2"
                       style="resize:vertical;font-family:inherit"
-                      placeholder="Interne Notiz / Zahlungshinweis"></textarea>
+                      placeholder="Interne Notiz / Zahlungshinweis">${_esc(p.notes || '')}</textarea>
           </div>
 
         </form>