import assert from 'node:assert/strict';
import { after, before, describe, it } from 'node:test';
import { startTestDatabase, type TestDatabase } from './harness.js';

// Die Module lesen beim Laden die Umgebung, deshalb werden sie erst nach dem
// Start der Testdatenbank dynamisch importiert.
type Credits = typeof import('../src/services/credits.js');
type Characters = typeof import('../src/services/characters.js');
type Db = typeof import('../src/db.js');

let database: TestDatabase;
let credits: Credits;
let characters: Characters;
let db: Db;
let ctx: { actorId: number; actorName: string };

async function freshPlayer(name: string): Promise<number> {
  const player = await db.prisma.player.create({ data: { displayName: name } });
  return player.id;
}

before(async () => {
  database = await startTestDatabase(54329);
  process.env.DATABASE_URL = database.url;
  process.env.SESSION_SECRET = 'test-secret-that-is-long-enough-000000';
  process.env.NODE_ENV = 'test';

  db = await import('../src/db.js');
  credits = await import('../src/services/credits.js');
  characters = await import('../src/services/characters.js');

  const user = await db.prisma.user.create({
    data: { username: 'tester', passwordHash: 'x', role: 'ADMIN' },
  });
  ctx = { actorId: user.id, actorName: user.username };
});

after(async () => {
  await db.prisma.$disconnect();
  await database.stop();
});

describe('Guthaben-Töpfe', () => {
  it('ein CC-Paket erzeugt CC UND bezahltes Redesign', async () => {
    const playerId = await freshPlayer('Paket-Spieler');
    const { balances } = await credits.bookCcPackage(playerId, ctx);

    assert.equal(balances.CC, 1);
    assert.equal(balances.REDESIGN_PAID, 1);
    assert.equal(balances.REDESIGN_KULANZ, 0);
  });

  it('ein Redesign-Paket erzeugt nur Redesign-Guthaben', async () => {
    const playerId = await freshPlayer('Redesign-Spieler');
    const { balances } = await credits.bookRedesignPackage(playerId, ctx);

    assert.equal(balances.CC, 0);
    assert.equal(balances.REDESIGN_PAID, 1);
  });

  it('Kulanz landet im eigenen Topf und zählt zur Redesign-Summe', async () => {
    const playerId = await freshPlayer('Kulanz-Spieler');
    const { balances } = await credits.bookKulanz(playerId, ctx);

    assert.equal(balances.REDESIGN_KULANZ, 1);
    assert.equal(balances.REDESIGN_PAID, 0);
    assert.equal(balances.redesignTotal, 1);
  });

  it('ein überzogenes Konto wird zugelassen, nicht blockiert', async () => {
    const playerId = await freshPlayer('Minus-Spieler');
    const result = await characters.createCharacter(playerId, { name: 'Vorab-CC' }, ctx);

    assert.equal(result.balances.CC, -1);
    assert.equal(result.overdrawn, true);
  });
});

describe('CC-Lebenszyklus', () => {
  it('ein neuer CC verbraucht genau ein CC-Guthaben', async () => {
    const playerId = await freshPlayer('Ersteller');
    await credits.bookCcPackage(playerId, ctx);

    const result = await characters.createCharacter(playerId, { name: 'Dr. Bright' }, ctx);

    assert.equal(result.character.status, 'ACTIVE');
    assert.equal(result.balances.CC, 0);
    assert.equal(result.balances.REDESIGN_PAID, 1, 'das inklusive Redesign bleibt erhalten');
    assert.equal(result.overdrawn, false);
  });

  it('ein Redesign setzt den alten CC auf REWORKED und verkettet den neuen', async () => {
    const playerId = await freshPlayer('Redesigner');
    await credits.bookCcPackage(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'Alt' }, ctx);

    const result = await characters.redesignCharacter(
      first.character.id,
      { name: 'Neu', useKind: 'REDESIGN_PAID' },
      ctx,
    );

    assert.equal(result.predecessor.status, 'INACTIVE');
    assert.equal(result.predecessor.inactiveReason, 'REWORKED');
    assert.equal(result.character.status, 'ACTIVE');
    assert.equal(result.character.predecessorId, first.character.id);
    assert.equal(
      result.character.lineageId,
      first.character.lineageId,
      'die Kette behält ihre lineageId',
    );
    assert.equal(result.balances.REDESIGN_PAID, 0);
  });

  it('ein Redesign kann auch aus dem Kulanz-Topf bezahlt werden', async () => {
    const playerId = await freshPlayer('Kulanz-Redesigner');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookKulanz(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'Alt' }, ctx);

    const result = await characters.redesignCharacter(
      first.character.id,
      { name: 'Neu', useKind: 'REDESIGN_KULANZ' },
      ctx,
    );

    assert.equal(result.balances.REDESIGN_KULANZ, 0);
    assert.equal(result.balances.REDESIGN_PAID, 1, 'der bezahlte Topf bleibt unangetastet');
  });
});

describe('Reaktivierung', () => {
  it('ein wegen Inaktivität entfernter CC kommt gratis zurück', async () => {
    const playerId = await freshPlayer('Inaktiver');
    await credits.bookCcPackage(playerId, ctx);
    const created = await characters.createCharacter(playerId, { name: 'Geputzt' }, ctx);

    await characters.deactivateCharacter(created.character.id, 'PLAYER_INACTIVITY', ctx);
    const before = await credits.getBalances(playerId);
    const result = await characters.reactivateFree(created.character.id, ctx);

    assert.equal(result.character.status, 'ACTIVE');
    assert.equal(result.character.inactiveReason, null);
    assert.deepEqual(result.balances, before, 'kein Guthaben wurde bewegt');
  });

  it('ein reworkter CC kommt NICHT gratis zurück', async () => {
    const playerId = await freshPlayer('Rework-Spieler');
    await credits.bookCcPackage(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'Alt' }, ctx);
    await characters.redesignCharacter(
      first.character.id,
      { name: 'Neu', useKind: 'REDESIGN_PAID' },
      ctx,
    );

    await assert.rejects(
      () => characters.reactivateFree(first.character.id, ctx),
      (error: Error & { code?: string }) => error.code === 'NOT_FREE',
    );
  });

  it('ein reworkter CC kommt gegen CC-Guthaben zurück', async () => {
    const playerId = await freshPlayer('Wiederbeleber');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookCcPackage(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'Alt' }, ctx);
    await characters.redesignCharacter(
      first.character.id,
      { name: 'Neu', useKind: 'REDESIGN_PAID' },
      ctx,
    );

    const before = await credits.getBalances(playerId);
    const result = await characters.reactivatePaid(first.character.id, 'CC', ctx);

    assert.equal(result.character.status, 'ACTIVE');
    assert.equal(result.balances.CC, before.CC - 1);
  });

  it('auch ein aus anderem Grund entfernter CC kommt gratis zurück', async () => {
    const playerId = await freshPlayer('Einheit-weg');
    await credits.bookCcPackage(playerId, ctx);
    const created = await characters.createCharacter(playerId, { name: 'MTF-Operativer' }, ctx);

    await characters.deactivateCharacter(
      created.character.id,
      'OTHER',
      ctx,
      'Einheit bis März entfernt',
    );

    const deactivated = await db.prisma.character.findUniqueOrThrow({
      where: { id: created.character.id },
    });
    assert.equal(deactivated.inactiveNote, 'Einheit bis März entfernt', 'der Grund bleibt lesbar');

    const before = await credits.getBalances(playerId);
    const result = await characters.reactivateFree(created.character.id, ctx);

    assert.equal(result.character.status, 'ACTIVE');
    assert.equal(result.character.inactiveNote, null, 'die Notiz wird beim Zurückholen gelöscht');
    assert.deepEqual(result.balances, before, 'kein Guthaben wurde bewegt');
  });

  it('eine bezahlte Reaktivierung wird bei jedem Gratis-Fall verweigert', async () => {
    const playerId = await freshPlayer('Gratis-Fall');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookCcPackage(playerId, ctx);

    for (const reason of ['PLAYER_INACTIVITY', 'OTHER'] as const) {
      const created = await characters.createCharacter(playerId, { name: `CC-${reason}` }, ctx);
      await characters.deactivateCharacter(created.character.id, reason, ctx);

      await assert.rejects(
        () => characters.reactivatePaid(created.character.id, 'CC', ctx),
        (error: Error & { code?: string }) => error.code === 'IS_FREE',
        `Grund ${reason} darf nichts kosten`,
      );
    }
  });
});

describe('Korrekturen', () => {
  it('ein Paket-Storno nimmt beide Zeilen gemeinsam zurück', async () => {
    const playerId = await freshPlayer('Storno-Spieler');
    const booked = await credits.bookCcPackage(playerId, ctx);

    const entry = await db.prisma.creditLedger.findFirstOrThrow({
      where: { groupId: booked.groupId },
    });
    const result = await credits.reverseGroup(entry.id, 'Doppelt erfasst', ctx);

    assert.equal(result.reversed, 2, 'beide Zeilen des Pakets');
    assert.equal(result.balances.CC, 0);
    assert.equal(result.balances.REDESIGN_PAID, 0);
  });

  it('dieselbe Buchung lässt sich kein zweites Mal stornieren', async () => {
    const playerId = await freshPlayer('Doppel-Storno');
    const booked = await credits.bookKulanz(playerId, ctx);
    const entry = await db.prisma.creditLedger.findFirstOrThrow({
      where: { groupId: booked.groupId },
    });

    await credits.reverseGroup(entry.id, 'Erste Korrektur', ctx);

    await assert.rejects(
      () => credits.reverseGroup(entry.id, 'Nochmal', ctx),
      (error: Error & { code?: string }) => error.code === 'ALREADY_REVERSED',
    );
  });

  it('eine Verbrauchsbuchung wird nicht direkt storniert', async () => {
    const playerId = await freshPlayer('Verbrauch-Storno');
    await credits.bookCcPackage(playerId, ctx);
    const created = await characters.createCharacter(playerId, { name: 'CC' }, ctx);

    const consume = await db.prisma.creditLedger.findFirstOrThrow({
      where: { characterId: created.character.id, source: 'CONSUME' },
    });

    await assert.rejects(
      () => credits.reverseGroup(consume.id, 'Versuch', ctx),
      (error: Error & { code?: string }) => error.code === 'CONSUME_NOT_REVERSIBLE',
    );
  });

  it('eine Rücknahme bucht das Guthaben zurück und reaktiviert den Vorgänger', async () => {
    const playerId = await freshPlayer('Rücknehmer');
    await credits.bookCcPackage(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'Original' }, ctx);
    const redesigned = await characters.redesignCharacter(
      first.character.id,
      { name: 'Versehen', useKind: 'REDESIGN_PAID' },
      ctx,
    );

    const result = await characters.revertCharacter(
      redesigned.character.id,
      'Falscher Spieler',
      ctx,
    );

    assert.equal(result.restoredPredecessorId, first.character.id);
    assert.equal(result.balances.REDESIGN_PAID, 1, 'das Redesign-Guthaben ist wieder da');

    const restored = await db.prisma.character.findUniqueOrThrow({
      where: { id: first.character.id },
    });
    assert.equal(restored.status, 'ACTIVE');
    assert.equal(restored.inactiveReason, null);
  });

  it('eine Rücknahme mitten in der Kette wird abgelehnt', async () => {
    const playerId = await freshPlayer('Ketten-Spieler');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookRedesignPackage(playerId, ctx);
    const first = await characters.createCharacter(playerId, { name: 'A' }, ctx);
    const second = await characters.redesignCharacter(
      first.character.id,
      { name: 'B', useKind: 'REDESIGN_PAID' },
      ctx,
    );
    await characters.redesignCharacter(
      second.character.id,
      { name: 'C', useKind: 'REDESIGN_PAID' },
      ctx,
    );

    await assert.rejects(
      () => characters.revertCharacter(second.character.id, 'Zu spät', ctx),
      (error: Error & { code?: string }) => error.code === 'HAS_SUCCESSORS',
    );
  });
});

describe('Von Hand eingetragene Guthaben zurücknehmen', () => {
  it('zählt, wie viel jemals in den Topf kam', async () => {
    const playerId = await freshPlayer('Zaehler');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookCcPackage(playerId, ctx);
    await characters.createCharacter(playerId, { name: 'Verbraucht eines' }, ctx);

    const stand = await credits.getBalances(playerId);
    assert.equal(stand.CC, 1, 'eines ist noch offen');
    assert.equal(stand.granted.CC, 2, 'zwei kamen jemals herein');
    assert.equal(stand.granted.REDESIGN_PAID, 2, 'jedes Paket bringt eines mit');
  });

  it('zählt die Rücknahme eines Verbrauchs nicht als Zugang', async () => {
    // Sonst sähe ein storniertes Redesign wie ein zusätzliches Paket aus.
    const playerId = await freshPlayer('Stornierer');
    await credits.bookCcPackage(playerId, ctx);
    const cc = await characters.createCharacter(playerId, { name: 'Wird zurückgenommen' }, ctx);
    await characters.revertCharacter(cc.character.id, 'Fehleintrag', ctx);

    const stand = await credits.getBalances(playerId);
    assert.equal(stand.CC, 1, 'das Guthaben ist zurück');
    assert.equal(stand.granted.CC, 1, 'hereingekommen ist trotzdem nur eines');
  });

  it('nimmt das zuletzt eingetragene CC-Paket zurück, beide Zeilen', async () => {
    const playerId = await freshPlayer('Vertipper');
    await credits.bookCcPackage(playerId, ctx);
    await credits.bookCcPackage(playerId, ctx);

    const { balances } = await credits.removeLastGrant(playerId, 'CC_PACKAGE', ctx);

    assert.equal(balances.CC, 1);
    assert.equal(balances.REDESIGN_PAID, 1, 'das mitgelieferte Redesign geht mit zurück');
    assert.equal(balances.granted.CC, 1, 'und zählt auch nicht mehr als erhalten');
  });

  it('nimmt eine Kulanz zurück', async () => {
    const playerId = await freshPlayer('Kulanzfall');
    await credits.bookKulanz(playerId, ctx, { note: 'War zu grosszügig' });

    const { balances } = await credits.removeLastGrant(playerId, 'KULANZ', ctx);
    assert.equal(balances.REDESIGN_KULANZ, 0);
    assert.equal(balances.granted.REDESIGN_KULANZ, 0);
  });

  it('meldet sich, wenn es nichts zurückzunehmen gibt', async () => {
    const playerId = await freshPlayer('Leerer Topf');

    await assert.rejects(
      () => credits.removeLastGrant(playerId, 'CC_PACKAGE', ctx),
      (error: Error & { code?: string }) => error.code === 'NOTHING_TO_REMOVE',
    );
  });

  it('lässt gebuchte Import-Pakete in Ruhe', async () => {
    // Ein Paket aus einer Bestellung gehört in die Historie, nicht unter
    // einen Knopf, der "das letzte weg" bedeutet.
    const playerId = await freshPlayer('Importiert');
    const importRecord = await db.prisma.import.create({
      data: { filename: 'shop.csv', status: 'COMMITTED', rowCount: 1 },
    });
    await db.prisma.creditLedger.create({
      data: {
        playerId,
        kind: 'CC',
        amount: 1,
        source: 'CC_PACKAGE',
        importId: importRecord.id,
      },
    });

    await assert.rejects(
      () => credits.removeLastGrant(playerId, 'CC_PACKAGE', ctx),
      (error: Error & { code?: string }) => error.code === 'NOTHING_TO_REMOVE',
    );
  });

  it('nimmt dieselbe Zugabe nicht zweimal zurück', async () => {
    const playerId = await freshPlayer('Doppelklicker');
    await credits.bookKulanz(playerId, ctx);

    await credits.removeLastGrant(playerId, 'KULANZ', ctx);
    await assert.rejects(
      () => credits.removeLastGrant(playerId, 'KULANZ', ctx),
      (error: Error & { code?: string }) => error.code === 'NOTHING_TO_REMOVE',
    );
  });
});