import { INestApplication } from '@nestjs/common';
import * as bcrypt from 'bcryptjs';
import request from 'supertest';
import { App } from 'supertest/types';
import { PrismaService } from '../src/prisma/prisma.service';
import { encodeCursor } from '../src/erp-export/erp-cursor';
import { API_KEY_FAILURE_LIMIT } from '../src/api-keys/api-keys.service';
import { createTestApp } from './utils/create-test-app';
import { login } from './utils/api';

interface CreatedKeyBody {
  apiKey: { id: string };
  token: string;
}

interface PageBody<T> {
  contractVersion: number;
  generatedAt: string;
  items: T[];
  nextCursor: string | null;
  hasMore: boolean;
  settledUntil?: string;
}

type Item = Record<string, unknown> & { id: string };

interface HarvestYearsBody {
  contractVersion: number;
  years: {
    year: number;
    netWeightKg: number;
    harvestCount: number;
    harvestsWithoutNetWeight: number;
  }[];
}

const BASE = '/api/v1/export/inventar';
const ENDPOINTS = ['produkte', 'chargen', 'bewegungen', 'ernten'] as const;

/**
 * Inventar-Spiegel für ERPNext (T8): nur lesend, nur mit erp-inventory:read,
 * nur freigegebene Felder, stabil und seitenweise. Der ERPNext-Importer wird
 * nach docs/erp-inventar-export.md gebaut und verlässt sich auf diese Form.
 */
describe('ERP-Inventar-Export (e2e)', () => {
  let app: INestApplication<App>;
  let prisma: PrismaService;
  const suffix = `${Date.now()}-${Math.round(Math.random() * 1e6)}`;
  const password = 'SuperSecret123!';
  let adminToken: string;
  let readonlyToken: string;
  let erpKey: string;
  let shopKey: string;
  let honeyProductId: string;
  let candleProductId: string;
  let bottlingId: string;
  let productionBatchId: string;
  // Laufeigener Zeitraum weit in der Vergangenheit: so finden sich die
  // Bewegungen dieses Laufs zwischen denen anderer Läufe und Tests.
  const movementBase = Date.UTC(2001, 0, 1) + (Date.now() % 1_000_000_000);
  const at = (seconds: number) => new Date(movementBase + seconds * 1000);
  const movementIds: Record<string, string> = {};

  const server = () => app.getHttpServer();

  // Jeder Test tritt als eigener Client auf (X-Forwarded-For, im Test wird
  // ein Proxy-Hop vertraut): diese Datei stellt mehr Anfragen, als der
  // globale Throttler einer einzelnen Adresse je Minute erlaubt.
  let clientCounter = 0;
  let clientIp = '198.51.100.1';
  beforeEach(() => {
    clientCounter += 1;
    clientIp = `198.51.100.${clientCounter}`;
  });

  function get(path: string, token: string, ip = clientIp) {
    return request(server())
      .get(`${BASE}/${path}`)
      .set('Authorization', `Bearer ${token}`)
      .set('X-Forwarded-For', ip);
  }

  async function createKey(scopes: string[]): Promise<CreatedKeyBody> {
    const response = await request(server())
      .post('/api/v1/api-keys')
      .set('Authorization', `Bearer ${adminToken}`)
      .send({ name: `ERP-Test ${suffix}`, scopes })
      .expect(201);
    return response.body as CreatedKeyBody;
  }

  async function allItems(path: string): Promise<Item[]> {
    const items: Item[] = [];
    let nach: string | null = null;
    for (let page = 0; page < 20; page++) {
      const query = nach ? `?limit=500&nach=${nach}` : '?limit=500';
      const body = (await get(`${path}${query}`, erpKey).expect(200))
        .body as PageBody<Item>;
      items.push(...body.items);
      if (!body.hasMore) return items;
      nach = body.nextCursor;
    }
    throw new Error('zu viele Seiten');
  }

  beforeAll(async () => {
    app = await createTestApp();
    prisma = app.get(PrismaService);
    const passwordHash = await bcrypt.hash(password, 12);
    const owner = await prisma.user.create({
      data: {
        email: `erp-admin-${suffix}@example.com`,
        passwordHash,
        name: 'Erika Imkerin',
        role: { connect: { key: 'ADMIN' } },
      },
    });
    await prisma.user.create({
      data: {
        email: `erp-ro-${suffix}@example.com`,
        passwordHash,
        name: 'Nur Lesen',
        role: { connect: { key: 'READONLY' } },
      },
    });
    adminToken = (await login(app, `erp-admin-${suffix}@example.com`, password))
      .accessToken;
    readonlyToken = (await login(app, `erp-ro-${suffix}@example.com`, password))
      .accessToken;
    erpKey = (await createKey(['erp-inventory:read'])).token;
    shopKey = (await createKey(['shop-sync:read', 'shop-sync:write'])).token;

    const apiary = await prisma.apiary.create({
      data: { name: `Waldrand ${suffix}`, notes: 'Schlüssel unter dem Stein' },
    });
    const harvest = await prisma.harvest.create({
      data: {
        apiaryId: apiary.id,
        userId: owner.id,
        date: new Date('2026-07-14T00:00:00.000Z'),
        honeyType: 'Sommertracht',
        netWeight: 41,
        notes: 'Volk 7 schwach',
      },
    });
    const extraction = await prisma.extraction.create({
      data: {
        date: new Date('2026-07-20T00:00:00.000Z'),
        userId: owner.id,
        harvests: { create: [{ harvestId: harvest.id }] },
      },
    });
    const honeyBatch = await prisma.honeyBatch.create({
      data: {
        batchNumber: `HB-${suffix}`,
        extractionId: extraction.id,
        honeyType: 'Sommertracht',
        amount: 50,
      },
    });
    honeyProductId = (
      await prisma.product.create({
        data: {
          name: `Sommertracht 500 g ${suffix}`,
          sku: `ERP-${suffix}`,
          description: 'Interne Notiz: Lieferant Gläser Huber',
          packagingSize: 500,
          weight: 500,
          salesUnit: 'Glas',
        },
      })
    ).id;
    candleProductId = (
      await prisma.product.create({
        data: {
          name: `Bienenwachskerze ${suffix}`,
          kind: 'MANUFACTURED',
          shopCategory: 'KERZEN',
        },
      })
    ).id;
    bottlingId = (
      await prisma.bottlingBatch.create({
        data: {
          honeyBatchId: honeyBatch.id,
          productId: honeyProductId,
          userId: owner.id,
          date: new Date('2026-08-01T00:00:00.000Z'),
          bestBeforeDate: new Date('2028-08-01T00:00:00.000Z'),
          jarSize: 500,
          jarCount: 60,
          totalAmount: 30,
          lotNumber: `L-ERP-${suffix}`,
        },
      })
    ).id;
    productionBatchId = (
      await prisma.productionBatch.create({
        data: {
          productId: candleProductId,
          userId: owner.id,
          lotNumber: `K-ERP-${suffix}`,
          date: new Date('2026-09-01T00:00:00.000Z'),
          quantity: 20,
          notes: 'Docht von Firma Meier',
        },
      })
    ).id;
    const rawLot = await prisma.rawMaterialLot.create({
      data: {
        kind: 'BEESWAX',
        lotNumber: `W-ERP-${suffix}`,
        date: new Date('2026-07-20T00:00:00.000Z'),
        quantity: 1000,
      },
    });

    const book = async (
      key: string,
      data: Parameters<PrismaService['batchMovement']['create']>[0]['data'],
    ) => {
      movementIds[key] = (await prisma.batchMovement.create({ data })).id;
    };
    const personal = {
      notes: 'an Nachbar Müller verschenkt',
      userId: owner.id,
    };
    await book('hofladen', {
      bottlingBatchId: bottlingId,
      type: 'WITHDRAWAL',
      reason: 'HOFLADEN',
      quantity: -6,
      createdAt: at(1),
      ...personal,
    });
    await book('eigenbedarf', {
      bottlingBatchId: bottlingId,
      type: 'WITHDRAWAL',
      reason: 'EIGENBEDARF',
      quantity: -2,
      createdAt: at(2),
      ...personal,
    });
    await book('verkauf', {
      bottlingBatchId: bottlingId,
      type: 'SHOP_SALE',
      quantity: -3,
      createdAt: at(2),
    });
    await book('bruch', {
      productionBatchId,
      type: 'WITHDRAWAL',
      reason: 'BRUCH',
      quantity: -1,
      createdAt: at(3),
      ...personal,
    });
    await book('korrektur', {
      bottlingBatchId: bottlingId,
      type: 'CORRECTION',
      quantity: 1,
      createdAt: at(4),
      ...personal,
    });
    await book('rohstoff', {
      rawMaterialLotId: rawLot.id,
      type: 'WITHDRAWAL',
      reason: 'SONSTIGES',
      quantity: -10,
      createdAt: at(5),
    });
    // Gerade eben gebucht: noch innerhalb der Wartezeit.
    await book('frisch', {
      bottlingBatchId: bottlingId,
      type: 'WITHDRAWAL',
      reason: 'PROBE',
      quantity: -1,
    });
  });

  afterAll(async () => {
    await app.close();
  });

  describe('Zugang', () => {
    it.each(ENDPOINTS)('%s ist mit dem ERP-Schlüssel lesbar', async (path) => {
      await get(path, erpKey).expect(200);
    });

    it.each(ENDPOINTS)('%s verlangt einen Schlüssel (401)', async (path) => {
      await request(server()).get(`${BASE}/${path}`).expect(401);
    });

    it('lehnt fehlerhafte und unbekannte Schlüssel ab (401)', async () => {
      await get('produkte', 'ack_nope').expect(401);
      await get('produkte', `ack_abcd1234_${'Z'.repeat(43)}`).expect(401);
    });

    it.each(ENDPOINTS)(
      '%s bleibt dem Shop-Schlüssel verschlossen (403)',
      async (path) => {
        await get(path, shopKey).expect(403);
      },
    );

    it('verweigert Benutzern ohne das Recht den Export (403)', async () => {
      await get('produkte', readonlyToken).expect(403);
    });

    it('öffnet dem ERP-Schlüssel nichts außer dem Export', async () => {
      const auth = { Authorization: `Bearer ${erpKey}` };
      for (const path of [
        '/api/v1/shop-sync',
        '/api/v1/shop-sync/stock',
        '/api/v1/products',
        '/api/v1/harvests',
        '/api/v1/bottling-batches',
        '/api/v1/export/colonies.csv',
        '/api/v1/users',
        '/api/v1/auth/me',
      ]) {
        await request(server()).get(path).set(auth).expect(403);
      }
      await request(server())
        .post('/api/v1/shop-sync/movements')
        .set(auth)
        .send({ requests: [] })
        .expect(403);
    });

    it('sperrt einen widerrufenen Schlüssel sofort (401)', async () => {
      const created = await createKey(['erp-inventory:read']);
      await get('produkte', created.token).expect(200);
      await request(server())
        .post(`/api/v1/api-keys/${created.apiKey.id}/revoke`)
        .set('Authorization', `Bearer ${adminToken}`)
        .expect(201);
      await get('produkte', created.token).expect(401);
    });
  });

  describe('Produkte', () => {
    it('liefert nur die freigegebenen Felder, ohne Beschreibung', async () => {
      const items = await allItems('produkte');
      const honey = items.find((p) => p.id === honeyProductId);
      const candle = items.find((p) => p.id === candleProductId);

      expect(Object.keys(honey ?? {}).sort()).toEqual(
        [
          'id',
          'kind',
          'name',
          'packagingSize',
          'salesUnit',
          'shopCategory',
          'sku',
          'status',
          'updatedAt',
          'weight',
        ].sort(),
      );
      expect(honey).toMatchObject({
        name: `Sommertracht 500 g ${suffix}`,
        sku: `ERP-${suffix}`,
        kind: 'BOTTLED_HONEY',
        shopCategory: 'HONIG',
        status: 'ACTIVE',
        packagingSize: 500,
        weight: 500,
        salesUnit: 'Glas',
      });
      expect(candle).toMatchObject({
        kind: 'MANUFACTURED',
        shopCategory: 'KERZEN',
      });
      expect(JSON.stringify(items)).not.toContain('Lieferant Gläser Huber');
    });

    it('blättert stabil nach id', async () => {
      const first = (await get('produkte?limit=1', erpKey).expect(200))
        .body as PageBody<Item>;
      expect(first.contractVersion).toBe(1);
      expect(first.items).toHaveLength(1);
      expect(first.hasMore).toBe(true);

      const second = (
        await get(`produkte?limit=1&nach=${first.nextCursor}`, erpKey).expect(
          200,
        )
      ).body as PageBody<Item>;
      expect(second.items).toHaveLength(1);
      expect(second.items[0].id > first.items[0].id).toBe(true);
    });
  });

  describe('Chargen', () => {
    it('liefert Abfüllung und Herstellungscharge mit Rest aus dem Bewegungsbuch', async () => {
      const items = await allItems('chargen');
      const bottling = items.find((b) => b.id === bottlingId);
      const production = items.find((b) => b.id === productionBatchId);

      expect(bottling).toEqual({
        id: bottlingId,
        batchType: 'BOTTLING',
        lotNumber: `L-ERP-${suffix}`,
        productId: honeyProductId,
        date: '2026-08-01T00:00:00.000Z',
        bestBeforeDate: '2028-08-01T00:00:00.000Z',
        initialQuantity: 60,
        // 60 - 6 Hofladen - 2 Eigenbedarf - 3 Shop + 1 Inventur - 1 Probe
        remainingQuantity: 49,
        fillWeightGrams: 500,
        honeyType: 'Sommertracht',
      });
      expect(production).toEqual({
        id: productionBatchId,
        batchType: 'PRODUCTION',
        lotNumber: `K-ERP-${suffix}`,
        productId: candleProductId,
        date: '2026-09-01T00:00:00.000Z',
        bestBeforeDate: null,
        initialQuantity: 20,
        remainingQuantity: 19,
        fillWeightGrams: null,
        honeyType: null,
      });
      // Abfüllungen vor Herstellungschargen.
      const kinds = items.map((b) => b.batchType);
      expect(kinds.lastIndexOf('BOTTLING')).toBeLessThan(
        kinds.indexOf('PRODUCTION'),
      );
      const raw = JSON.stringify(items);
      expect(raw).not.toContain('Docht von Firma Meier');
      expect(raw).not.toContain('Erika Imkerin');
      // Rohstoff-Chargen sind keine Ware.
      expect(raw).not.toContain(`W-ERP-${suffix}`);
    });

    it('blättert ohne Lücken und Dubletten', async () => {
      const all = (await allItems('chargen')).map((b) => b.id);
      const limit = Math.max(1, Math.ceil(all.length / 3));
      const seen: string[] = [];
      let nach: string | null = null;
      for (let page = 0; page < 20; page++) {
        const query: string = nach
          ? `?limit=${limit}&nach=${nach}`
          : `?limit=${limit}`;
        const body = (await get(`chargen${query}`, erpKey).expect(200))
          .body as PageBody<Item>;
        expect(body.items.length).toBeLessThanOrEqual(limit);
        seen.push(...body.items.map((b) => b.id));
        nach = body.nextCursor;
        if (!body.hasMore) break;
      }
      expect(new Set(seen).size).toBe(seen.length);
      expect(seen).toEqual(
        expect.arrayContaining([bottlingId, productionBatchId]),
      );
      // Andere Testdateien legen parallel Chargen an oder löschen welche:
      // verglichen wird die Reihenfolge der Chargen, die beide Abrufe sahen.
      const inBoth = new Set(all.filter((id) => seen.includes(id)));
      expect(seen.filter((id) => inBoth.has(id))).toEqual(
        all.filter((id) => inBoth.has(id)),
      );
    });
  });

  describe('Bewegungen', () => {
    async function myMovements(): Promise<{ items: Item[]; cursor: string }> {
      const mine = new Set(Object.values(movementIds));
      const found: Item[] = [];
      let query = `bewegungen?limit=2&seit=${at(0).toISOString()}`;
      for (let page = 0; page < 40; page++) {
        const body = (await get(query, erpKey).expect(200))
          .body as PageBody<Item>;
        found.push(...body.items.filter((m) => mine.has(m.id)));
        const last = body.items[body.items.length - 1];
        const passedMine =
          last !== undefined &&
          new Date(last.createdAt as string).getTime() > at(5).getTime();
        if (!body.hasMore || passedMine) {
          return { items: found, cursor: body.nextCursor! };
        }
        query = `bewegungen?limit=2&nach=${body.nextCursor}`;
      }
      throw new Error('zu viele Seiten');
    }

    it('liefert Entnahmen mit Grund, Shop-Verkäufe und Inventur in stabiler Reihenfolge', async () => {
      const { items } = await myMovements();

      // Zeitpunkt, dann id: eigenbedarf und verkauf haben denselben Zeitpunkt.
      const sameTime = [movementIds.eigenbedarf, movementIds.verkauf].sort();
      expect(items.map((m) => m.id)).toEqual([
        movementIds.hofladen,
        ...sameTime,
        movementIds.bruch,
        movementIds.korrektur,
      ]);
      expect(items.find((m) => m.id === movementIds.hofladen)).toEqual({
        id: movementIds.hofladen,
        createdAt: at(1).toISOString(),
        batchType: 'BOTTLING',
        batchId: bottlingId,
        lotNumber: `L-ERP-${suffix}`,
        productId: honeyProductId,
        type: 'WITHDRAWAL',
        reason: 'HOFLADEN',
        quantity: -6,
      });
      expect(items.find((m) => m.id === movementIds.bruch)).toMatchObject({
        batchType: 'PRODUCTION',
        batchId: productionBatchId,
        productId: candleProductId,
        reason: 'BRUCH',
        quantity: -1,
      });
      expect(items.find((m) => m.id === movementIds.verkauf)).toMatchObject({
        type: 'SHOP_SALE',
        reason: null,
        quantity: -3,
      });
      expect(items.find((m) => m.id === movementIds.korrektur)).toMatchObject({
        type: 'CORRECTION',
        quantity: 1,
      });
    });

    it('lässt Rohstoffe, Notizen, Benutzer und noch offene Buchungen weg', async () => {
      const { items } = await myMovements();
      const ids = items.map((m) => m.id);
      expect(ids).not.toContain(movementIds.rohstoff);
      expect(ids).not.toContain(movementIds.frisch);
      const raw = JSON.stringify(items);
      expect(raw).not.toContain('Müller');
      expect(raw).not.toContain('Erika');
      expect(raw).not.toContain('userId');
    });

    it('meldet, bis wann die Liste vollständig ist', async () => {
      const before = Date.now();
      const body = (await get('bewegungen?limit=1', erpKey).expect(200))
        .body as PageBody<Item>;
      const settled = new Date(body.settledUntil!).getTime();
      expect(settled).toBeLessThanOrEqual(before - 4 * 60 * 1000);
      expect(settled).toBeGreaterThan(before - 6 * 60 * 1000);
    });

    it('setzt mit dem letzten Cursor fort, ohne etwas doppelt zu liefern', async () => {
      const { cursor } = await myMovements();
      const body = (
        await get(`bewegungen?limit=500&nach=${cursor}`, erpKey).expect(200)
      ).body as PageBody<Item>;
      const mine = new Set(Object.values(movementIds));
      // Nur Bewegungen hinter dem Cursor - die eigenen lagen davor.
      expect(body.items.filter((m) => mine.has(m.id))).toEqual([]);
    });
  });

  describe('Parameter', () => {
    it.each([
      ['produkte?limit=0'],
      ['produkte?limit=501'],
      ['produkte?limit=zwei'],
      ['produkte?nach=kaputt!'],
      ['produkte?seite=2'],
      ['chargen?nach=bm90LWpzb24'],
      ['bewegungen?seit=gestern'],
      ['ernten?jahr=1800'],
      ['ernten?jahr=dieses'],
    ])('lehnt %s ab (400)', async (path) => {
      await get(path, erpKey).expect(400);
    });

    it('lehnt einen Cursor eines anderen Endpunkts ab (400)', async () => {
      const productCursor = encodeCursor({ k: 'produkte', id: honeyProductId });
      await get(`bewegungen?nach=${productCursor}`, erpKey).expect(400);
    });

    it('lehnt einen Bewegungs-Cursor mit unmöglichem Jahr ab (400 statt 500)', async () => {
      const cursor = encodeCursor({
        k: 'bewegungen',
        ts: '+275760-09-13T00:00:00.000Z',
        id: movementIds.hofladen,
      });
      await get(`bewegungen?nach=${cursor}`, erpKey).expect(400);
    });

    it('verträgt ein fernes seit (leere Seite statt Fehler)', async () => {
      const body = (
        await get('bewegungen?seit=9999-12-31T00:00:00Z', erpKey).expect(200)
      ).body as PageBody<Item>;
      expect(body.items).toEqual([]);
    });

    it('lehnt seit und nach zusammen ab (400)', async () => {
      const cursor = encodeCursor({
        k: 'bewegungen',
        ts: at(1).toISOString(),
        id: movementIds.hofladen,
      });
      await get(
        `bewegungen?seit=${at(0).toISOString()}&nach=${cursor}`,
        erpKey,
      ).expect(400);
    });
  });

  describe('Ernten', () => {
    it('summiert das Nettogewicht eines Jahres und weist Ernten ohne Gewicht aus', async () => {
      const year = 2003;
      const read = async () =>
        (
          (await get(`ernten?jahr=${year}`, erpKey).expect(200))
            .body as HarvestYearsBody
        ).years;
      const before = await read();
      expect(before).toHaveLength(1);

      const owner = await prisma.user.findFirstOrThrow({
        where: { email: `erp-admin-${suffix}@example.com` },
      });
      const apiary = await prisma.apiary.create({
        data: { name: `Ernte-Stand ${suffix}` },
      });
      for (const [day, netWeight] of [
        ['2003-06-01', 12.5],
        ['2003-07-15', 7.25],
        ['2003-08-30', null],
        ['2004-01-01', 99],
      ] as const) {
        await prisma.harvest.create({
          data: {
            apiaryId: apiary.id,
            userId: owner.id,
            date: new Date(`${day}T00:00:00.000Z`),
            netWeight,
          },
        });
      }

      const [after] = await read();
      expect(after.year).toBe(year);
      expect(after.netWeightKg - before[0].netWeightKg).toBeCloseTo(19.75, 3);
      expect(after.harvestCount - before[0].harvestCount).toBe(3);
      expect(
        after.harvestsWithoutNetWeight - before[0].harvestsWithoutNetWeight,
      ).toBe(1);
    });

    it('liefert ohne Jahr alle Jahre aufsteigend, ohne Standorte', async () => {
      const body = (await get('ernten', erpKey).expect(200))
        .body as HarvestYearsBody;
      const years = body.years.map((y) => y.year);
      expect(years).toEqual([...years].sort((a, b) => a - b));
      expect(years).toContain(2026);
      const raw = JSON.stringify(body);
      expect(raw).not.toContain('Waldrand');
      expect(raw).not.toContain('Volk 7');
    });
  });

  describe('Fehlversuche', () => {
    it('sperrt nach zu vielen unbekannten Schlüsseln weitere ungültige mit 429, andere Adressen nicht', async () => {
      const attacker = '203.0.113.50';
      const wrong = `ack_abcd1234_${'Y'.repeat(43)}`;
      for (let i = 0; i < API_KEY_FAILURE_LIMIT.maxFailures; i++) {
        await get('produkte', wrong, attacker).expect(401);
      }
      const blocked = await get('produkte', wrong, attacker).expect(429);
      expect(blocked.body).toMatchObject({
        statusCode: 429,
        message: expect.stringContaining('Fehlversuche') as string,
      });
      await get('produkte', wrong, '203.0.113.51').expect(401);
    });

    it('lässt einen gültigen Schlüssel auch von einer gesperrten Adresse durch', async () => {
      // Sonst könnte jeder, der die gemeinsame Adresse (Cluster-Ausgang,
      // Proxy) nutzt oder fälscht, ERPNext oder den Shop aussperren.
      const shared = '203.0.113.60';
      const wrong = `ack_abcd1234_${'X'.repeat(43)}`;
      for (let i = 0; i < API_KEY_FAILURE_LIMIT.maxFailures; i++) {
        await get('produkte', wrong, shared).expect(401);
      }
      await get('produkte', wrong, shared).expect(429);
      await get('produkte', erpKey, shared).expect(200);
      await request(server())
        .get('/api/v1/shop-sync/stock')
        .set('Authorization', `Bearer ${shopKey}`)
        .set('X-Forwarded-For', shared)
        .expect(200);
    });

    it('zählt fehlerhaft aufgebaute Schlüssel nicht', async () => {
      const ip = '203.0.113.70';
      for (let i = 0; i < API_KEY_FAILURE_LIMIT.maxFailures + 5; i++) {
        await get('produkte', 'ack_x', ip).expect(401);
      }
      await get('produkte', `ack_abcd1234_${'W'.repeat(43)}`, ip).expect(401);
    });
  });
});