/**
 * Match-candidates API — integration test.
 *
 * Exercises the GET /api/v1/clients/match-candidates handler against a
 * real port + clients pool. Verifies the dedup library's at-create
 * suggestion path returns the right candidates and confidence tiers
 * for the "use existing client?" form interruption.
 */
import { describe, expect, it } from 'vitest';

import { db } from '@/lib/db';
import { clientContacts } from '@/lib/db/schema/clients';
import { getMatchCandidatesHandler } from '@/app/api/v1/clients/match-candidates/handlers';
import { makeMockCtx, makeMockRequest } from '../../helpers/route-tester';
import { makeClient, makePort } from '../../helpers/factories';

interface MatchData {
  clientId: string;
  fullName: string;
  score: number;
  confidence: 'high' | 'medium' | 'low';
  reasons: string[];
  interestCount: number;
}

async function callHandler(
  ctx: ReturnType<typeof makeMockCtx>,
  query: Record<string, string>,
): Promise<MatchData[]> {
  const url = new URL('http://localhost/api/v1/clients/match-candidates');
  for (const [k, v] of Object.entries(query)) url.searchParams.set(k, v);
  const req = makeMockRequest('GET', url.toString());
  const res = await getMatchCandidatesHandler(req, ctx);
  expect(res.status).toBe(200);
  const body = await res.json();
  return body.data as MatchData[];
}

describe('GET /api/v1/clients/match-candidates', () => {
  it('returns empty when nothing actionable was provided', async () => {
    const port = await makePort();
    const ctx = makeMockCtx({ portId: port.id });
    const data = await callHandler(ctx, {});
    expect(data).toEqual([]);
  });

  it('finds an existing client by exact email match (high confidence)', async () => {
    const port = await makePort();
    const ctx = makeMockCtx({ portId: port.id });
    const existing = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus Laurent' },
    });
    await db.insert(clientContacts).values({
      clientId: existing.id,
      channel: 'email',
      value: 'marcus@example.com',
      isPrimary: true,
    });
    await db.insert(clientContacts).values({
      clientId: existing.id,
      channel: 'phone',
      value: '+15551234567',
      valueE164: '+15551234567',
      isPrimary: true,
    });

    const data = await callHandler(ctx, {
      email: 'Marcus@example.com',
      phone: '+15551234567',
      name: 'Marcus Laurent',
    });

    expect(data).toHaveLength(1);
    expect(data[0]!.clientId).toBe(existing.id);
    expect(data[0]!.confidence).toBe('high');
    expect(data[0]!.reasons).toEqual(expect.arrayContaining(['email match', 'phone match']));
  });

  it('does not surface unrelated clients in the same port', async () => {
    const port = await makePort();
    const ctx = makeMockCtx({ portId: port.id });
    const target = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Marcus Laurent' },
    });
    await db.insert(clientContacts).values({
      clientId: target.id,
      channel: 'email',
      value: 'marcus@example.com',
      isPrimary: true,
    });
    // An unrelated client.
    const unrelated = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Bob Smith' },
    });
    await db.insert(clientContacts).values({
      clientId: unrelated.id,
      channel: 'email',
      value: 'bob@example.org',
      isPrimary: true,
    });

    const data = await callHandler(ctx, { email: 'marcus@example.com' });
    expect(data.map((d) => d.clientId)).toEqual([target.id]);
  });

  it('returns medium-confidence partial matches', async () => {
    // Same name, different contact info — Pattern F territory.
    const port = await makePort();
    const ctx = makeMockCtx({ portId: port.id });
    const existing = await makeClient({
      portId: port.id,
      overrides: { fullName: 'Etiennette Clamouze' },
    });
    await db.insert(clientContacts).values({
      clientId: existing.id,
      channel: 'email',
      value: 'clamouze.etiennette@gmail.com',
      isPrimary: true,
    });

    const data = await callHandler(ctx, {
      // Different email + phone, same name.
      email: 'etiennette@the-manoah.com',
      name: 'Etiennette Clamouze',
    });

    // Either no match (low confidence filtered out) or a medium one —
    // either is fine. Critically, NOT high.
    if (data.length > 0) {
      expect(data[0]!.confidence).not.toBe('high');
    }
  });

  it('does not leak across ports', async () => {
    const portA = await makePort();
    const portB = await makePort();

    const ctxA = makeMockCtx({ portId: portA.id });
    const inB = await makeClient({
      portId: portB.id,
      overrides: { fullName: 'In Port B' },
    });
    await db.insert(clientContacts).values({
      clientId: inB.id,
      channel: 'email',
      value: 'b@example.com',
      isPrimary: true,
    });

    // Caller is in port A, asking for an email that lives in port B.
    const data = await callHandler(ctxA, { email: 'b@example.com' });
    expect(data).toEqual([]);
  });
});