// Tool: 3D-Druck-Kalkulator
const express = require('express');
const db      = require('../../db');
const { authenticate } = require('../../middleware/auth');
const router = express.Router();

router.get('/', authenticate, (req, res) => {
  const uid = req.user.id;
  const items = db.prepare('SELECT * FROM calculations WHERE user_id=? ORDER BY created_at DESC').all(uid);

  const baseFolder = db.prepare(
    "SELECT id FROM folders WHERE user_id=? AND name='3D-Modelle' AND parent_id IS NULL"
  ).get(uid);
  let filesMap = {};
  if (baseFolder) {
    const rows = db.prepare(`
      SELECT f.name, COUNT(fi.id) AS cnt FROM folders f
      LEFT JOIN files fi ON fi.folder_id = f.id
      WHERE f.parent_id = ? AND f.user_id = ? GROUP BY f.id
    `).all(baseFolder.id, uid);
    for (const r of rows) filesMap[r.name] = r.cnt > 0;
  }

  // Geteilt mit mir
  const shared = db.prepare(`
    SELECT c.*, u.username as owner_name, 1 as is_shared
    FROM calculations c
    JOIN calculation_shares cs ON cs.calc_id = c.id
    JOIN users u ON u.id = c.user_id
    WHERE cs.shared_with = ?
    ORDER BY c.created_at DESC
  `).all(uid);

  res.json({
    own:    items.map(i => ({ ...i, has_files: !!filesMap[i.name] })),
    shared: shared,
  });
});

// Share-Management
router.get('/:id/shares', authenticate, (req, res) => {
  const calc = db.prepare('SELECT * FROM calculations WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
  if (!calc) return res.status(404).json({ error: 'Nicht gefunden' });
  res.json(db.prepare(`
    SELECT u.id, u.username, cs.created_at as shared_at
    FROM calculation_shares cs JOIN users u ON u.id = cs.shared_with
    WHERE cs.calc_id = ?
  `).all(calc.id));
});

router.post('/:id/share', authenticate, (req, res) => {
  const calc = db.prepare('SELECT * FROM calculations WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
  if (!calc) return res.status(404).json({ error: 'Nicht gefunden' });
  const target = db.prepare('SELECT * FROM users WHERE username=?').get(req.body.username);
  if (!target) return res.status(404).json({ error: 'Benutzer nicht gefunden' });
  if (target.id === req.user.id) return res.status(400).json({ error: 'Kann nicht mit dir selbst teilen' });
  db.prepare("INSERT OR IGNORE INTO calculation_shares (calc_id, shared_by, shared_with, created_at) VALUES (?,?,?,datetime('now','localtime'))")
    .run(calc.id, req.user.id, target.id);
  res.json({ ok: true });
});

router.delete('/:id/share/:userId', authenticate, (req, res) => {
  const calc = db.prepare('SELECT * FROM calculations WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
  if (!calc) return res.status(404).json({ error: 'Nicht gefunden' });
  db.prepare('DELETE FROM calculation_shares WHERE calc_id=? AND shared_with=?').run(calc.id, req.params.userId);
  res.json({ ok: true });
});

router.post('/', authenticate, (req, res) => {
  const { name, gramm, stunden, farben,
    materialpreis_pro_gramm, stromverbrauch_kw, strompreis_pro_kwh,
    druckerpreis, gesamtdruckstunden, verschleiss_pro_stunde,
    preis_freundschaft, preis_normal, preis_auftrag,
    image = null, bemerkung = '' } = req.body;

  if (!name || gramm == null || stunden == null)
    return res.status(400).json({ error: 'Name, Gramm und Stunden erforderlich' });

  const r = db.prepare(`INSERT INTO calculations
    (user_id,name,gramm,stunden,farben,materialpreis_pro_gramm,stromverbrauch_kw,
     strompreis_pro_kwh,druckerpreis,gesamtdruckstunden,verschleiss_pro_stunde,
     preis_freundschaft,preis_normal,preis_auftrag,image,bemerkung)
    VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`)
    .run(req.user.id, name, gramm, stunden, farben,
      materialpreis_pro_gramm, stromverbrauch_kw, strompreis_pro_kwh,
      druckerpreis, gesamtdruckstunden, verschleiss_pro_stunde,
      preis_freundschaft, preis_normal, preis_auftrag, image, bemerkung);

  res.json(db.prepare('SELECT * FROM calculations WHERE id=?').get(r.lastInsertRowid));
});

router.put('/:id', authenticate, (req, res) => {
  const ex = db.prepare('SELECT * FROM calculations WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
  if (!ex) return res.status(404).json({ error: 'Nicht gefunden' });

  const { name, gramm, stunden, farben,
    materialpreis_pro_gramm, stromverbrauch_kw, strompreis_pro_kwh,
    druckerpreis, gesamtdruckstunden, verschleiss_pro_stunde,
    preis_freundschaft, preis_normal, preis_auftrag,
    image = ex.image, bemerkung = ex.bemerkung } = req.body;

  db.prepare(`UPDATE calculations SET
    name=?,gramm=?,stunden=?,farben=?,materialpreis_pro_gramm=?,stromverbrauch_kw=?,
    strompreis_pro_kwh=?,druckerpreis=?,gesamtdruckstunden=?,verschleiss_pro_stunde=?,
    preis_freundschaft=?,preis_normal=?,preis_auftrag=?,image=?,bemerkung=?,
    updated_at=CURRENT_TIMESTAMP WHERE id=? AND user_id=?`)
    .run(name, gramm, stunden, farben,
      materialpreis_pro_gramm, stromverbrauch_kw, strompreis_pro_kwh,
      druckerpreis, gesamtdruckstunden, verschleiss_pro_stunde,
      preis_freundschaft, preis_normal, preis_auftrag, image, bemerkung,
      req.params.id, req.user.id);

  res.json(db.prepare('SELECT * FROM calculations WHERE id=?').get(req.params.id));
});

router.delete('/:id', authenticate, (req, res) => {
  const r = db.prepare('DELETE FROM calculations WHERE id=? AND user_id=?').run(req.params.id, req.user.id);
  if (!r.changes) return res.status(404).json({ error: 'Nicht gefunden' });
  res.json({ success: true });
});

module.exports = router;