import express from 'express';
import { requireRole, ROLES } from '../middleware/auth.js';
import { DEFAULTS, getSettings, saveSetting } from '../lib/settings.js';
import { ssoConfigured, testConnection } from '../lib/sso.js';
import { sendDocument } from '../export/render.js';

const router = express.Router();

// Fuer alle Angemeldeten: was die Oberflaeche zum Rechnen braucht.
router.get('/public', async (req, res, next) => {
  try {
    const s = await getSettings();
    res.json({
      weekly_hours: Number(s.weekly_hours),
      hours_per_day: Number(s.hours_per_day),
      budget_warn_percent: Number(s.budget_warn_percent),
      budget_warn_days: Number(s.budget_warn_days),
      company_name: s.company_name,
      project_code_pattern: s.project_code_pattern,
      project_name_pattern: s.project_name_pattern,
    });
  } catch (err) {
    next(err);
  }
});

router.get('/', requireRole('admin'), async (req, res, next) => {
  try {
    const s = await getSettings();
    // Geheimnisse werden nie ausgeliefert, nur die Information, dass sie stehen.
    res.json({
      ...s,
      sso: { ...s.sso, client_secret: '', client_secret_set: Boolean(s.sso.client_secret), configured: ssoConfigured(s.sso) },
      hrworks: {
        ...s.hrworks,
        secret_access_key: '',
        secret_set: Boolean(s.hrworks.secret_access_key),
        configured: Boolean(s.hrworks.access_key && s.hrworks.secret_access_key),
      },
    });
  } catch (err) {
    next(err);
  }
});

const text = (v, max) => String(v ?? '').slice(0, max);

router.put('/', requireRole('admin'), async (req, res, next) => {
  try {
    const body = req.body || {};
    const current = await getSettings();
    const errors = [];

    const numbers = {
      weekly_hours: [1, 80],
      hours_per_day: [1, 24],
      budget_warn_percent: [1, 100],
      budget_warn_days: [0, 365],
    };
    for (const [key, [min, max]] of Object.entries(numbers)) {
      if (body[key] === undefined) continue;
      const value = Number(body[key]);
      if (!(value >= min && value <= max)) errors.push(`${key}: Wert zwischen ${min} und ${max}.`);
      else await saveSetting(key, value);
    }
    if (body.company_name !== undefined) await saveSetting('company_name', text(body.company_name, 160));
    if (body.project_code_pattern !== undefined) {
      const pattern = text(body.project_code_pattern, 60).trim();
      if (!pattern.includes('{NR}')) errors.push('Das Codemuster braucht {NR}, sonst sind Codes nicht eindeutig.');
      else await saveSetting('project_code_pattern', pattern);
    }
    if (body.project_name_pattern !== undefined) {
      const pattern = text(body.project_name_pattern, 60).trim();
      if (!pattern.includes('{PROJEKT}')) errors.push('Das Namensmuster braucht {PROJEKT}.');
      else await saveSetting('project_name_pattern', pattern);
    }

    if (body.export) {
      const next_ = { ...current.export };
      for (const key of Object.keys(DEFAULTS.export)) {
        if (body.export[key] === undefined) continue;
        if (key === 'show_signature') next_[key] = Boolean(body.export[key]);
        else if (key === 'logo') {
          const logo = body.export.logo;
          if (logo === null || logo === '') next_.logo = null;
          else if (/^data:image\/(png|jpe?g);base64,/.test(logo) && logo.length < 2_500_000) next_.logo = logo;
          else errors.push('Logo: PNG oder JPG bis ca. 1,8 MB.');
        } else if (key === 'accent') {
          if (/^#[0-9a-f]{6}$/i.test(body.export.accent)) next_.accent = body.export.accent;
          else errors.push('Akzentfarbe ist ungültig.');
        } else next_[key] = text(body.export[key], 300);
      }
      await saveSetting('export', next_);
    }

    if (body.hrworks) {
      const next_ = { ...current.hrworks };
      for (const key of ['access_key', 'project_code', 'holiday_task']) {
        if (body.hrworks[key] !== undefined) next_[key] = text(body.hrworks[key], 200).trim();
      }
      if (body.hrworks.enabled !== undefined) next_.enabled = Boolean(body.hrworks.enabled);
      if (body.hrworks.window_days !== undefined) {
        const days = Number(body.hrworks.window_days);
        if (days >= 1 && days <= 365) next_.window_days = Math.round(days);
        else errors.push('HRworks: Fenster zwischen 1 und 365 Tagen.');
      }
      if (body.hrworks.half_day_hours !== undefined) {
        const hours = Number(body.hrworks.half_day_hours);
        if (hours >= 0 && hours <= 12) next_.half_day_hours = hours;
        else errors.push('HRworks: Stunden für einen halben Tag zwischen 0 und 12.');
      }
      if (body.hrworks.type_map && typeof body.hrworks.type_map === 'object') {
        const map = {};
        for (const [key, value] of Object.entries(body.hrworks.type_map)) {
          if (/^(absence|sick):[A-Za-z0-9_-]{1,20}$/.test(key)) map[key] = text(value, 160).trim();
        }
        next_.type_map = map;
      }
      // Leer = unveraendert; der geheime Teil wird nie ausgeliefert.
      if (body.hrworks.secret_access_key) next_.secret_access_key = text(body.hrworks.secret_access_key, 500).trim();
      if (body.hrworks.clear_secret) next_.secret_access_key = '';
      if (next_.enabled && !(next_.access_key && next_.secret_access_key)) {
        errors.push('HRworks kann erst aktiviert werden, wenn Access Key und Secret gesetzt sind.');
      }
      if (!errors.length) await saveSetting('hrworks', next_);
    }

    if (body.sso) {
      const next_ = { ...current.sso };
      for (const key of ['tenant_id', 'client_id', 'redirect_uri', 'button_label']) {
        if (body.sso[key] !== undefined) next_[key] = text(body.sso[key], 300).trim();
      }
      for (const key of ['enabled', 'local_login']) {
        if (body.sso[key] !== undefined) next_[key] = Boolean(body.sso[key]);
      }
      // Leer = unveraendert lassen; das Secret wird nie ausgeliefert.
      if (body.sso.client_secret) next_.client_secret = text(body.sso.client_secret, 500).trim();
      if (body.sso.clear_secret) next_.client_secret = '';
      if (next_.enabled && !ssoConfigured(next_)) errors.push('SSO kann erst aktiviert werden, wenn Tenant, Client-ID, Secret und Redirect-URI gesetzt sind.');
      if (next_.enabled && !ssoConfigured(next_)) next_.enabled = false;
      if (!next_.enabled) next_.local_login = true; // ohne SSO braucht es die normale Anmeldung
      await saveSetting('sso', next_);
    }

    if (errors.length) return res.status(400).json({ error: errors.join(' ') });
    res.json({ ok: true });
  } catch (err) {
    next(err);
  }
});

router.post('/sso/test', requireRole('admin'), async (req, res) => {
  try {
    const { sso } = await getSettings();
    if (!ssoConfigured(sso)) return res.status(400).json({ error: 'Tenant, Client-ID und Secret fehlen.' });
    const result = await testConnection(sso);
    res.json({ ok: true, ...result });
  } catch (err) {
    res.status(502).json({ error: `Verbindung fehlgeschlagen: ${err.message}` });
  }
});

/** Beispiel-Stundennachweis mit Platzhalterdaten - zeigt Kopf und Fuss. */
router.get('/export-preview', requireRole('admin'), async (req, res, next) => {
  try {
    const settings = await getSettings();
    const format = ['pdf', 'xlsx', 'csv'].includes(req.query.format) ? req.query.format : 'pdf';
    const rows = [
      ['2026-09-01', 'Di', 'Projektleitung', 'Jour fixe und Statusbericht', 150],
      ['2026-09-02', 'Mi', 'Konzeption', 'Workshop Anforderungen', 420],
      ['2026-09-03', 'Do', 'Konzeption', 'Dokumentation Prozessmodell', 390],
      ['2026-09-04', 'Fr', 'Projektleitung', '', 240],
    ].map(([entry_date, weekday, task_name, note, minutes]) => ({
      entry_date,
      weekday,
      project_display: 'Musterkunde - Beispielprojekt',
      task_name,
      note,
      minutes,
      duration: `${Math.floor(minutes / 60)}:${String(minutes % 60).padStart(2, '0')}`,
    }));
    const total = rows.reduce((s, r) => s + r.minutes, 0);
    await sendDocument(
      res,
      {
        title: settings.export.title || 'Stundennachweis',
        subtitle: 'Vorschau',
        filename: 'Vorschau Stundennachweis',
        info: [
          ['Berater', 'Max Mustermann'],
          ['Kunde', 'Musterkunde GmbH'],
          ['Zeitraum', '01.09.2026 – 30.09.2026'],
          ['Projekt', 'Musterkunde - Beispielprojekt'],
        ],
        kpis: [
          ['Gesamtstunden', (total / 60).toLocaleString('de-DE', { minimumFractionDigits: 2 })],
          ['Tage mit Leistung', '4'],
        ],
        tables: [
          {
            columns: [
              { key: 'entry_date', label: 'Datum', type: 'date', width: 58 },
              { key: 'weekday', label: 'Tag', width: 26 },
              { key: 'project_display', label: 'Projekt', width: 120 },
              { key: 'task_name', label: 'Task', width: 80 },
              { key: 'note', label: 'Tätigkeit', type: 'text' },
              { key: 'duration', label: 'Dauer', align: 'right', width: 38 },
              { key: 'minutes', label: 'Stunden', type: 'hours', align: 'right', width: 46 },
            ],
            rows,
            totals: { weekday: 'Summe', minutes: total },
          },
        ],
        signature: true,
      },
      format,
      settings
    );
  } catch (err) {
    next(err);
  }
});

export default router;