feat: 3D-Statistik Tool mit Haushaltsbuch, Diagrammen und Ausgaben-Tracker

backend/src/db.js

@@ -590,4 +590,17 @@ db.exec(`
   )
 `);
 
+// 3D-Druck Ausgaben (Haushaltsbuch)
+db.exec(`
+  CREATE TABLE IF NOT EXISTS expenses (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    date        TEXT NOT NULL,
+    category    TEXT NOT NULL DEFAULT 'Sonstiges',
+    description TEXT NOT NULL,
+    amount      REAL NOT NULL,
+    created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
+  )
+`);
+
 module.exports = db;

backend/src/tools/statistik/routes.js

@@ -0,0 +1,116 @@
+const express = require('express');
+const router  = express.Router();
+const db      = require('../../db');
+const { authenticate } = require('../../middleware/auth');
+
+const uid = req => req.user.id;
+
+// ── Ausgaben CRUD ──────────────────────────────────────────────────────────
+router.get('/expenses', authenticate, (req, res) => {
+  const { from, to } = req.query;
+  let q = 'SELECT * FROM expenses WHERE user_id=?';
+  const p = [uid(req)];
+  if (from) { q += ' AND date>=?'; p.push(from); }
+  if (to)   { q += ' AND date<=?'; p.push(to); }
+  q += ' ORDER BY date DESC, id DESC';
+  res.json(db.prepare(q).all(...p));
+});
+
+router.post('/expenses', authenticate, (req, res) => {
+  const { date, category, description, amount } = req.body;
+  if (!date || !description || !amount) return res.status(400).json({ error: 'Fehlende Felder' });
+  const r = db.prepare('INSERT INTO expenses (user_id,date,category,description,amount) VALUES (?,?,?,?,?)')
+    .run(uid(req), date, category||'Sonstiges', description, parseFloat(amount));
+  res.json(db.prepare('SELECT * FROM expenses WHERE id=?').get(r.lastInsertRowid));
+});
+
+router.delete('/expenses/:id', authenticate, (req, res) => {
+  const e = db.prepare('SELECT id FROM expenses WHERE id=? AND user_id=?').get(req.params.id, uid(req));
+  if (!e) return res.status(404).json({ error: 'Nicht gefunden' });
+  db.prepare('DELETE FROM expenses WHERE id=?').run(e.id);
+  res.json({ ok: true });
+});
+
+// ── Statistik-Daten ────────────────────────────────────────────────────────
+router.get('/overview', authenticate, (req, res) => {
+  const { from, to } = req.query;
+  const u = uid(req);
+
+  let oq = `SELECT o.*,
+    COALESCE(o.custom_price,
+      (SELECT SUM(oi.custom_price * oi.stueckzahl) FROM order_items oi WHERE oi.order_id=o.id AND oi.custom_price IS NOT NULL)
+    ) as revenue,
+    (SELECT COALESCE(SUM(COALESCE(c.preis_freundschaft, oi.preis_freundschaft, 0) * oi.stueckzahl),0)
+     FROM order_items oi LEFT JOIN calculations c ON c.id=oi.calculation_id WHERE oi.order_id=o.id) as base_cost
+    FROM orders o WHERE o.user_id=?`;
+  const op = [u];
+  if (from) { oq += ' AND DATE(o.created_at)>=?'; op.push(from); }
+  if (to)   { oq += ' AND DATE(o.created_at)<=?'; op.push(to); }
+  oq += ' ORDER BY o.created_at DESC';
+  const orders = db.prepare(oq).all(...op);
+
+  const paidOrders = orders.filter(o => !!o.bezahlt);
+  const openOrders = orders.filter(o => !o.bezahlt && o.status !== 'warteliste');
+
+  const totalRevenue  = paidOrders.reduce((s,o) => s + (o.revenue || 0), 0);
+  const openRevenue   = openOrders.reduce((s,o) => s + (o.revenue || 0), 0);
+  const totalBaseCost = paidOrders.reduce((s,o) => s + (o.base_cost || 0), 0);
+  const totalProfit   = totalRevenue - totalBaseCost;
+
+  let eq = 'SELECT * FROM expenses WHERE user_id=?';
+  const ep = [u];
+  if (from) { eq += ' AND date>=?'; ep.push(from); }
+  if (to)   { eq += ' AND date<=?'; ep.push(to); }
+  const expenses = db.prepare(eq + ' ORDER BY date DESC').all(...ep);
+  const totalExpenses = expenses.reduce((s,e) => s + e.amount, 0);
+  const netProfit = totalProfit - totalExpenses;
+
+  const byStatus = { warteliste:0, in_arbeit:0, fertig:0, bezahlt:0, abgeschlossen:0 };
+  for (const o of orders) {
+    if (!!o.bezahlt && !!o.abgeholt) byStatus.abgeschlossen++;
+    else if (!!o.bezahlt)            byStatus.bezahlt++;
+    else if (o.status in byStatus)   byStatus[o.status]++;
+  }
+
+  const byCategory = {};
+  for (const e of expenses) {
+    byCategory[e.category] = (byCategory[e.category] || 0) + e.amount;
+  }
+
+  // Monatliche Daten
+  const monthlyRev = db.prepare(`
+    SELECT strftime('%Y-%m', created_at) as month,
+      SUM(CASE WHEN bezahlt=1 THEN COALESCE(custom_price,0) ELSE 0 END) as revenue,
+      COUNT(*) as orders
+    FROM orders WHERE user_id=? GROUP BY month ORDER BY month
+  `).all(u);
+
+  const monthlyExp = db.prepare(`
+    SELECT strftime('%Y-%m', date) as month, SUM(amount) as expenses
+    FROM expenses WHERE user_id=? GROUP BY month ORDER BY month
+  `).all(u);
+
+  const monthlyMap = {};
+  for (const m of monthlyRev) monthlyMap[m.month] = { month:m.month, revenue:m.revenue||0, orders:m.orders||0, expenses:0 };
+  for (const m of monthlyExp) {
+    if (monthlyMap[m.month]) monthlyMap[m.month].expenses = m.expenses||0;
+    else monthlyMap[m.month] = { month:m.month, revenue:0, orders:0, expenses:m.expenses||0 };
+  }
+  const monthlyData = Object.values(monthlyMap).sort((a,b)=>a.month.localeCompare(b.month)).slice(-12);
+
+  let cum = 0;
+  const cumulativeData = monthlyData.map(m => {
+    cum += (m.revenue||0) - (m.expenses||0);
+    return { month: m.month, value: Math.round(cum*100)/100 };
+  });
+
+  res.json({
+    totalRevenue, openRevenue, totalBaseCost, totalProfit,
+    totalExpenses, netProfit, totalOrders: orders.length,
+    byStatus, byCategory, monthlyData, cumulativeData,
+    expenses: expenses.slice(0,100),
+    recentOrders: orders.slice(0,30),
+  });
+});
+
+module.exports = router;