import { beforeAll, describe, expect, it } from 'vitest';
import type { FastifyInstance } from 'fastify';
import { buildApp } from '../src/server.js';
import { run } from '../src/core/db.js';
import { runOnce } from '../../worker/src/jobs.js';
import { call, code, login, makeUser } from './helpers.js';

let app: FastifyInstance;
beforeAll(async () => { app = await buildApp(); await app.ready(); });
const drain = async () => { for (let i = 0; i < 30; i++) { await run("UPDATE jobs SET run_at = UTC_TIMESTAMP(3) WHERE status IN ('scheduled','retrying')"); if (!(await runOnce(() => undefined))) break; } };
async function staff(email: string, role: string) {
  await makeUser({ email, kind: 'staff', staffRole: role }); const { client } = await login(app, email);
  const s = (await call(app, client, 'POST', '/auth/mfa/setup')).json(); await call(app, client, 'POST', '/auth/mfa/confirm', { code: code(s.secret) }); return client;
}
async function customer(admin: any, name: string, mail: string) {
  const c = (await call(app, admin, 'POST', '/admin/customers', { type: 'business', name, owner: { email: mail, name } })).json();
  await app.inject({ method: 'POST', url: '/v1/auth/invite/accept', payload: { token: new URL(c.inviteLink).searchParams.get('token'), password: 'passwort-kunde-123', repeat: 'passwort-kunde-123' } });
  return { org: c.id as string, client: (await login(app, mail, 'passwort-kunde-123')).client };
}
const COMPANY = { name: 'Testfirma GmbH', street: 'Musterstr. 1', zip: '12345', city: 'Musterstadt', taxNumber: '12/345/67890' };

describe('Rechnungen', () => {
  it('Entwurf, Positionen, unvollständige Firmendaten blockieren das Ausstellen, danach ausstellen/PDF/bezahlt/Storno, Unveränderlichkeit, Mandantentrennung', async () => {
    const admin = await staff('inv-admin@example.com', 'superadmin'); const acc = await staff('inv-acc@example.com', 'accounting'); const support = await staff('inv-support@example.com', 'support');
    const A = await customer(admin, 'Kunde A', 'inv-a@example.com'); const B = await customer(admin, 'Kunde B', 'inv-b@example.com');

    expect((await call(app, support, 'POST', '/invoices', { orgId: A.org })).statusCode).toBe(403); // Support nur lesend
    const draft = (await call(app, acc, 'POST', '/invoices', { orgId: A.org, paymentMethod: 'Überweisung' })).json();
    expect((await call(app, A.client, 'GET', `/invoices/${draft.id}`)).statusCode).toBe(404); // Kunde sieht Entwurf nicht
    expect((await call(app, acc, 'GET', `/invoices/${draft.id}`)).json().status).toBe('draft');

    const items = [{ description: 'Hosting Paket M, September', quantity: 1, unitPriceNetCents: 10000, taxBp: 1900 }, { description: 'Domain-Aufschlag', quantity: 2, unitPriceNetCents: 500, taxBp: 1900 }];
    expect((await call(app, acc, 'PUT', `/invoices/${draft.id}/items`, { items })).statusCode).toBe(200);
    const withItems = (await call(app, acc, 'GET', `/invoices/${draft.id}`)).json();
    expect(withItems.totalNetCents).toBe(11000); expect(withItems.totalTaxCents).toBe(2090); expect(withItems.totalGrossCents).toBe(13090);

    // ohne vollständige Firmendaten kein Ausstellen
    const blocked = await call(app, acc, 'POST', `/invoices/${draft.id}/issue`); expect(blocked.statusCode).toBe(400); expect(blocked.json().error.code).toBe('COMPANY_SETTINGS_INCOMPLETE');
    expect((await call(app, acc, 'PUT', '/admin/company-settings', COMPANY)).statusCode).toBe(403); // nur superadmin
    expect((await call(app, admin, 'PUT', '/admin/company-settings', COMPANY)).statusCode).toBe(200);
    expect((await call(app, acc, 'GET', '/admin/company-settings')).json().complete).toBe(true);

    const issued = await call(app, acc, 'POST', `/invoices/${draft.id}/issue`); expect(issued.statusCode).toBe(200); const number = issued.json().number; expect(number).toMatch(/^RE-\d+$/);
    // ab jetzt unveränderlich
    expect((await call(app, acc, 'PUT', `/invoices/${draft.id}/items`, { items })).statusCode).toBe(409);
    expect((await call(app, acc, 'DELETE', `/invoices/${draft.id}`)).statusCode).toBe(403);

    // Kunde sieht sie jetzt, PDF ist ladbar; fremder Kunde nicht
    const seen = (await call(app, A.client, 'GET', `/invoices/${draft.id}`)).json(); expect(seen.number).toBe(number); expect(seen.status).toBe('open');
    expect((await call(app, B.client, 'GET', `/invoices/${draft.id}`)).statusCode).toBe(404);
    const pdf = await app.inject({ method: 'GET', url: `/v1/invoices/${draft.id}/pdf`, headers: { cookie: A.client.cookie } });
    expect(pdf.statusCode).toBe(200); expect(pdf.headers['content-type']).toBe('application/pdf'); expect(pdf.rawPayload.subarray(0, 4).toString()).toBe('%PDF');

    // Storno: neue Rechnung mit umgekehrten Vorzeichen, Original unveränderlich als storniert markiert
    const credit = await call(app, acc, 'POST', `/invoices/${draft.id}/cancel`, { reason: 'Testkorrektur' }); expect(credit.statusCode).toBe(200);
    const orig = (await call(app, acc, 'GET', `/invoices/${draft.id}`)).json(); expect(orig.status).toBe('cancelled'); expect(orig.cancelledByInvoiceId).toBe(credit.json().creditInvoiceId);
    const cr = (await call(app, acc, 'GET', `/invoices/${credit.json().creditInvoiceId}`)).json(); expect(cr.totalGrossCents).toBe(-13090); expect(cr.cancelsInvoiceId).toBe(draft.id);
    expect((await call(app, acc, 'POST', `/invoices/${draft.id}/cancel`)).statusCode).toBe(409); // nicht doppelt stornierbar
    expect((await call(app, acc, 'POST', `/invoices/${draft.id}/mark-paid`)).statusCode).toBe(409); // stornierte Rechnung nicht mehr "bezahlbar"

    // zweite, normal bezahlte Rechnung
    const d2 = (await call(app, acc, 'POST', '/invoices', { orgId: A.org })).json();
    await call(app, acc, 'PUT', `/invoices/${d2.id}/items`, { items: [{ description: 'Setup', quantity: 1, unitPriceNetCents: 2000, taxBp: 1900 }] });
    await call(app, acc, 'POST', `/invoices/${d2.id}/issue`);
    expect((await call(app, acc, 'POST', `/invoices/${d2.id}/mark-paid`)).statusCode).toBe(200);
    expect((await call(app, acc, 'GET', `/invoices/${d2.id}`)).json().status).toBe('paid');

    // Listen: Kunde sieht nur eigene, keine Entwürfe
    const custList = (await call(app, A.client, 'GET', '/invoices')).json(); expect(custList.every((i: any) => i.status !== 'draft')).toBe(true); expect(custList.length).toBe(3);
    const staffOpenB = (await call(app, acc, 'GET', `/invoices?org=${B.org}`)).json(); expect(staffOpenB).toEqual([]);
  });
});

describe('Rechnungspositionen aus Produkt/Vertrag übernehmen', () => {
  it('Vorschlag aus einem Produkt (Einrichtung + wiederkehrend als eigene Positionen) und aus einem Vertrag (laufende Periode)', async () => {
    const admin = await staff('sugg-admin@example.com', 'superadmin'); const acc = await staff('sugg-acc@example.com', 'accounting');
    const A = await customer(admin, 'Kunde A', 'sugg-a@example.com');
    const t19 = (await call(app, admin, 'GET', '/admin/tax-rates')).json().find((t: any) => t.rateBp === 1900).id;

    const prod = await call(app, admin, 'POST', '/admin/products', {
      sku: 'HOST-M', category: 'hosting', orderableByCustomer: true, requiresApproval: false, customerActions: [], status: 'active',
      version: { name: 'Hosting Paket M', taxRateId: t19, setupCents: 1000, recurringCents: 2500, billingInterval: 'monthly', termMonths: 12, renewal: 'auto', renewalTermMonths: 1, noticeDays: 30, provisioning: {} },
    });
    const suggProd = (await call(app, acc, 'GET', `/invoices/suggest-from-product/${prod.json().id}`)).json();
    expect(suggProd.items).toEqual([{ description: 'Einrichtung: Hosting Paket M', quantity: 1, unitPriceNetCents: 1000, taxBp: 1900 }, { description: 'Hosting Paket M', quantity: 1, unitPriceNetCents: 2500, taxBp: 1900 }]);

    const order = (await call(app, admin, 'POST', '/orders', { orgId: A.org, items: [{ productId: prod.json().id }] })).json();
    const contractId = (await call(app, admin, 'GET', `/orders/${order.id}`)).json().items[0].contractId;
    const suggContract = (await call(app, acc, 'GET', `/invoices/suggest-from-contract/${contractId}`)).json();
    expect(suggContract.orgId).toBe(A.org); expect(suggContract.items).toEqual([{ description: 'Hosting Paket M', quantity: 1, unitPriceNetCents: 2500, taxBp: 1900, contractId }]);

    // Die Vorschläge lassen sich als Positionen übernehmen
    const draft = (await call(app, acc, 'POST', '/invoices', { orgId: A.org })).json();
    expect((await call(app, acc, 'PUT', `/invoices/${draft.id}/items`, { items: suggProd.items })).statusCode).toBe(200);
    expect((await call(app, acc, 'GET', `/invoices/${draft.id}`)).json().totalNetCents).toBe(3500);
  });
});

describe('Rechnungspositionen aus der Domain-Aufstellung', () => {
  it('Verkaufspreis (nie Einkauf) wird übernommen, inkl. Einrichtung; ohne Aufschlag klare Fehlermeldung', async () => {
    const admin = await staff('domsug-admin@example.com', 'superadmin'); const acc = await staff('domsug-acc@example.com', 'accounting');
    const A = await customer(admin, 'Kunde A', 'domsug-a@example.com');
    await call(app, admin, 'POST', '/admin/domain-tlds/import', { text: 'com\t12\t12,50\t12,00\t11,00\t10,50\t7,50 €' });

    const unpriced = (await call(app, admin, 'POST', '/admin/domain-records', { domain: 'domsug-x.com', orgId: A.org })).json();
    expect((await call(app, acc, 'GET', `/invoices/suggest-from-domain/${unpriced.id}`)).statusCode).toBe(400);

    await call(app, admin, 'PUT', '/admin/domain-settings', { tier: 1, rounding: false, basis: 'gross', margin: { type: 'percent', value: 2000 } });
    const priced = (await call(app, admin, 'POST', '/admin/domain-records', { domain: 'domsug-y.com', orgId: A.org })).json();
    const sugg = (await call(app, acc, 'GET', `/invoices/suggest-from-domain/${priced.id}`)).json();
    expect(sugg.orgId).toBe(A.org);
    expect(sugg.items).toEqual([{ description: 'Einrichtung domsug-y.com', quantity: 1, unitPriceNetCents: 630, taxBp: 1900 }, { description: 'domsug-y.com (12 Monate)', quantity: 1, unitPriceNetCents: 1261, taxBp: 1900 }]);

    const draft = (await call(app, acc, 'POST', '/invoices', { orgId: A.org })).json();
    await call(app, acc, 'PUT', `/invoices/${draft.id}/items`, { items: sugg.items });
    expect((await call(app, acc, 'GET', `/invoices/${draft.id}`)).json().totalNetCents).toBe(1891);
  });
});

describe('Rechnungsposition aus Produkt mit Laufzeit-Staffel', () => {
  it('Ohne Laufzeitangabe der Basispreis, mit Laufzeitangabe die Staffel; unbekannte Laufzeit abgelehnt', async () => {
    const admin = await staff('psugg-admin@example.com', 'superadmin'); const acc = await staff('psugg-acc@example.com', 'accounting');
    const t19 = (await call(app, admin, 'GET', '/admin/tax-rates')).json().find((t: any) => t.rateBp === 1900).id;
    const prod = await call(app, admin, 'POST', '/admin/products', {
      sku: 'HOST-PSUGG', category: 'hosting', orderableByCustomer: true, requiresApproval: false, customerActions: [], status: 'active',
      version: { name: 'Hosting X', taxRateId: t19, setupCents: 0, recurringCents: 999, billingInterval: 'monthly', termMonths: 1, renewal: 'auto', renewalTermMonths: 1, noticeDays: 30, provisioning: {},
        termPrices: [{ termMonths: 12, recurringCents: 9588 }] },
    });
    const base = (await call(app, acc, 'GET', `/invoices/suggest-from-product/${prod.json().id}`)).json();
    expect(base.items).toEqual([{ description: 'Hosting X', quantity: 1, unitPriceNetCents: 999, taxBp: 1900 }]);
    const tier = (await call(app, acc, 'GET', `/invoices/suggest-from-product/${prod.json().id}?termMonths=12`)).json();
    expect(tier.items).toEqual([{ description: 'Hosting X (12 Monate)', quantity: 1, unitPriceNetCents: 9588, taxBp: 1900 }]);
    expect((await call(app, acc, 'GET', `/invoices/suggest-from-product/${prod.json().id}?termMonths=6`)).statusCode).toBe(400);
  });
});

describe('Mahnwesen: überfällige Rechnungen und fällige Verträge', () => {
  it('Überfällige offene Rechnungen und Verträge ohne aktuelle Rechnung werden gefunden; bezahlte/aktuelle/inaktive nicht', async () => {
    const admin = await staff('rem-admin@example.com', 'superadmin'); const acc = await staff('rem-acc@example.com', 'accounting'); const support = await staff('rem-support@example.com', 'support');
    await call(app, admin, 'PUT', '/admin/company-settings', COMPANY);
    const A = await customer(admin, 'Kunde A', 'rem-a@example.com'); const B = await customer(admin, 'Kunde B', 'rem-b@example.com'); const C = await customer(admin, 'Kunde C', 'rem-c@example.com');
    const t19 = (await call(app, admin, 'GET', '/admin/tax-rates')).json().find((t: any) => t.rateBp === 1900).id;
    const prod = (await call(app, admin, 'POST', '/admin/products', {
      sku: 'HOST-REM', category: 'hosting', orderableByCustomer: true, requiresApproval: false, customerActions: [], status: 'active',
      version: { name: 'Hosting Monatlich', taxRateId: t19, setupCents: 0, recurringCents: 999, billingInterval: 'monthly', termMonths: 0, renewal: 'auto', renewalTermMonths: 1, noticeDays: 30, provisioning: {}, termPrices: [] },
    })).json();

    // A: Vertrag seit 40 Tagen, nie in Rechnung gestellt -> fällig
    const orderA = (await call(app, admin, 'POST', '/orders', { orgId: A.org, items: [{ productId: prod.id }] })).json(); await drain();
    const contractA = (await call(app, admin, 'GET', `/orders/${orderA.id}`)).json().items[0].contractId;
    await run('UPDATE contracts SET started_at = DATE_SUB(UTC_TIMESTAMP(3), INTERVAL 40 DAY) WHERE id = ?', [contractA]);

    // B: Vertrag seit 40 Tagen, aber vor 5 Tagen bereits in Rechnung gestellt -> nicht fällig
    const orderB = (await call(app, admin, 'POST', '/orders', { orgId: B.org, items: [{ productId: prod.id }] })).json(); await drain();
    const contractB = (await call(app, admin, 'GET', `/orders/${orderB.id}`)).json().items[0].contractId;
    await run('UPDATE contracts SET started_at = DATE_SUB(UTC_TIMESTAMP(3), INTERVAL 40 DAY) WHERE id = ?', [contractB]);
    const invB = (await call(app, acc, 'POST', '/invoices', { orgId: B.org })).json();
    await call(app, acc, 'PUT', `/invoices/${invB.id}/items`, { items: [{ description: 'x', quantity: 1, unitPriceNetCents: 999, taxBp: 1900, contractId: contractB }] });
    await call(app, acc, 'POST', `/invoices/${invB.id}/issue`);
    await run('UPDATE invoices SET issue_date = DATE_SUB(UTC_TIMESTAMP(3), INTERVAL 5 DAY) WHERE id = ?', [invB.id]);

    // C: Vertrag erst seit 2 Tagen -> nicht fällig
    const orderC = (await call(app, admin, 'POST', '/orders', { orgId: C.org, items: [{ productId: prod.id }] })).json(); await drain();

    // überfällige Rechnung bei A: ausgestellt, Zahlungsziel überschritten, offen
    const invA = (await call(app, acc, 'POST', '/invoices', { orgId: A.org })).json();
    await call(app, acc, 'PUT', `/invoices/${invA.id}/items`, { items: [{ description: 'überfällig', quantity: 1, unitPriceNetCents: 5000, taxBp: 1900 }] });
    await call(app, acc, 'POST', `/invoices/${invA.id}/issue`, { dueDate: new Date(Date.now() - 3 * 86400000).toISOString().slice(0, 10) });

    const r = (await call(app, acc, 'GET', '/invoices/reminders')).json();
    expect(r.overdueInvoices.map((i: any) => i.id)).toContain(invA.id);
    expect(r.overdueInvoices.map((i: any) => i.id)).not.toContain(invB.id);
    const dueOrgs = r.dueContracts.map((c: any) => c.orgId);
    expect(dueOrgs).toContain(A.org); expect(dueOrgs).not.toContain(B.org); expect(dueOrgs).not.toContain(C.org);
    const entryA = r.dueContracts.find((c: any) => c.orgId === A.org); expect(entryA.productName).toBe('Hosting Monatlich'); expect(entryA.lastInvoicedAt).toBeNull();

    expect((await call(app, support, 'GET', '/invoices/reminders')).statusCode).toBe(200); // Support liest mit
    expect((await call(app, A.client, 'GET', '/invoices/reminders')).statusCode).toBe(403); // Kunden nicht
  });
});