/**
 * Client merge service — end-to-end integration test.
 *
 * Spins up two real clients in a real port via the factory helpers,
 * attaches a few satellites (interest, contact, address, note),
 * merges them, and asserts everything survived in the right place
 * with the merge log written.
 */
import { describe, expect, it } from 'vitest';
import { eq } from 'drizzle-orm';

import { db } from '@/lib/db';
import { clients, clientContacts, clientNotes, clientMergeLog } from '@/lib/db/schema/clients';
import { interests } from '@/lib/db/schema/interests';
import { mergeClients } from '@/lib/services/client-merge.service';
import { makeClient, makePort, makeBerth } from '../../helpers/factories';

describe('mergeClients', () => {
  it('moves interests and contacts from loser to winner; archives loser; writes merge log', async () => {
    const port = await makePort();
    const winner = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus Laurent' },
    });
    const loser = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus Laurent (dup)' },
    });

    // Attach contact + interest to loser
    await db.insert(clientContacts).values({
      clientId: loser.id,
      channel: 'email',
      value: 'marcus@example.com',
      isPrimary: true,
    });
    await db.insert(clientNotes).values({
      clientId: loser.id,
      authorId: 'test-user',
      content: 'Loser-side note',
    });
    const berth = await makeBerth({ portId: port.id });
    await db.insert(interests).values({
      portId: port.id,
      clientId: loser.id,
      berthId: berth.id,
      pipelineStage: 'open',
      leadCategory: 'general_interest',
    });

    // ── Merge ─────────────────────────────────────────────────────────────
    const result = await mergeClients({
      winnerId: winner.id,
      loserId: loser.id,
      mergedBy: 'test-user',
    });

    expect(result.movedRows.interests).toBe(1);
    expect(result.movedRows.contacts).toBe(1);
    expect(result.movedRows.notes).toBe(1);

    // ── Loser should be archived with mergedIntoClientId set ──────────────
    const [archivedLoser] = await db.select().from(clients).where(eq(clients.id, loser.id));
    expect(archivedLoser?.archivedAt).not.toBeNull();
    expect(archivedLoser?.mergedIntoClientId).toBe(winner.id);

    // ── All loser-side rows now point at the winner ───────────────────────
    const winnerInterests = await db
      .select()
      .from(interests)
      .where(eq(interests.clientId, winner.id));
    expect(winnerInterests).toHaveLength(1);

    const winnerContacts = await db
      .select()
      .from(clientContacts)
      .where(eq(clientContacts.clientId, winner.id));
    expect(winnerContacts.find((c) => c.value === 'marcus@example.com')).toBeDefined();

    const winnerNotes = await db
      .select()
      .from(clientNotes)
      .where(eq(clientNotes.clientId, winner.id));
    expect(winnerNotes.find((n) => n.content === 'Loser-side note')).toBeDefined();

    // ── Merge log row exists with snapshot ────────────────────────────────
    const [log] = await db
      .select()
      .from(clientMergeLog)
      .where(eq(clientMergeLog.id, result.mergeLogId));
    expect(log?.survivingClientId).toBe(winner.id);
    expect(log?.mergedClientId).toBe(loser.id);
    expect(log?.mergedBy).toBe('test-user');
    expect(log?.mergeDetails).toBeDefined();
  });

  it('refuses to merge a client into itself', async () => {
    const port = await makePort();
    const c = await makeClient({ portId: port.id });
    await expect(mergeClients({ winnerId: c.id, loserId: c.id, mergedBy: 'u' })).rejects.toThrow(
      /itself/i,
    );
  });

  it('refuses to merge across different ports', async () => {
    const portA = await makePort();
    const portB = await makePort();
    const a = await makeClient({ portId: portA.id });
    const b = await makeClient({ portId: portB.id });
    await expect(mergeClients({ winnerId: a.id, loserId: b.id, mergedBy: 'u' })).rejects.toThrow(
      /different ports/i,
    );
  });

  it('refuses to merge a client that has already been merged', async () => {
    const port = await makePort();
    const winner = await makeClient({ portId: port.id });
    const loser = await makeClient({ portId: port.id });
    // First merge succeeds.
    await mergeClients({ winnerId: winner.id, loserId: loser.id, mergedBy: 'u' });
    // Second merge of the same loser should refuse.
    const winner2 = await makeClient({ portId: port.id });
    await expect(
      mergeClients({ winnerId: winner2.id, loserId: loser.id, mergedBy: 'u' }),
    ).rejects.toThrow(/already merged/i);
  });

  it('drops duplicate contact rows during reattach', async () => {
    const port = await makePort();
    const winner = await makeClient({ portId: port.id });
    const loser = await makeClient({ portId: port.id });

    // Both have the same email contact.
    await db.insert(clientContacts).values({
      clientId: winner.id,
      channel: 'email',
      value: 'same@example.com',
      isPrimary: true,
    });
    await db.insert(clientContacts).values({
      clientId: loser.id,
      channel: 'email',
      value: 'same@example.com',
      isPrimary: true,
    });

    const result = await mergeClients({
      winnerId: winner.id,
      loserId: loser.id,
      mergedBy: 'u',
    });

    expect(result.movedRows.contacts).toBe(0); // duplicate dropped
    const winnerEmails = await db
      .select()
      .from(clientContacts)
      .where(eq(clientContacts.clientId, winner.id));
    // Winner kept exactly one copy of the shared email.
    expect(winnerEmails.filter((c) => c.value === 'same@example.com')).toHaveLength(1);
  });

  it('applies fieldChoices to copy loser values onto the winner', async () => {
    const port = await makePort();
    const winner = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus L.' },
    });
    const loser = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus Laurent' },
    });

    await mergeClients({
      winnerId: winner.id,
      loserId: loser.id,
      mergedBy: 'u',
      fieldChoices: { fullName: 'loser' },
    });

    const [updatedWinner] = await db.select().from(clients).where(eq(clients.id, winner.id));
    expect(updatedWinner?.fullName).toBe('Marcus Laurent');
  });
});