/**
 * mimecast-client.ts — isMimecastConfigured()/getMimecastClient() factory tests.
 *
 * Mirrors pax8-factory.test.ts's beforeEach env-var-delete + reset seam
 * pattern. Does not test MimecastClient's other 20+ methods — out of scope
 * for this phase (Phase 17, Plan 01, Task 1).
 */

import { describe, it, expect, beforeEach, vi } from 'vitest';
import {
  isMimecastConfigured,
  getMimecastClient,
  getMimecastClientForTenant,
  _resetMimecastClient,
} from './mimecast-client';

beforeEach(() => {
  delete process.env.MIMECAST_CLIENT_ID;
  delete process.env.MIMECAST_CLIENT_SECRET;
  _resetMimecastClient();
});

describe('isMimecastConfigured', () => {
  it('returns false when neither env var is set', () => {
    expect(isMimecastConfigured()).toBe(false);
  });

  it('returns false when only MIMECAST_CLIENT_ID is set', () => {
    process.env.MIMECAST_CLIENT_ID = 'id1';
    expect(isMimecastConfigured()).toBe(false);
  });

  it('returns false when only MIMECAST_CLIENT_SECRET is set', () => {
    process.env.MIMECAST_CLIENT_SECRET = 'secret1';
    expect(isMimecastConfigured()).toBe(false);
  });

  it('returns true when both env vars are set', () => {
    process.env.MIMECAST_CLIENT_ID = 'id1';
    process.env.MIMECAST_CLIENT_SECRET = 'secret1';
    expect(isMimecastConfigured()).toBe(true);
  });
});

describe('getMimecastClient', () => {
  it('throws the exact configuration error when not configured', () => {
    expect(() => getMimecastClient()).toThrow(
      'MIMECAST_CLIENT_ID and MIMECAST_CLIENT_SECRET must be set'
    );
  });

  it('returns the same cached instance on repeated calls', () => {
    process.env.MIMECAST_CLIENT_ID = 'id1';
    process.env.MIMECAST_CLIENT_SECRET = 'secret1';
    const first = getMimecastClient();
    const second = getMimecastClient();
    expect(second).toBe(first);
  });

  it('rebuilds a new instance after _resetMimecastClient()', () => {
    process.env.MIMECAST_CLIENT_ID = 'id1';
    process.env.MIMECAST_CLIENT_SECRET = 'secret1';
    const first = getMimecastClient();
    _resetMimecastClient();
    const second = getMimecastClient();
    expect(second).not.toBe(first);
  });
});

describe('getMimecastClientForTenant', () => {
  // Fake credentials only — never real mimecast_tenants values.
  const FAKE_TENANT = { client_id: 'tid', client_secret: 'tsecret', base_url: 'https://tenant.example' };

  it('returns a MimecastClient instance exposing the fan-out methods', () => {
    const client = getMimecastClientForTenant(FAKE_TENANT);
    expect(client).toBeTruthy();
    expect(typeof client.searchDeliveredMessages).toBe('function');
    expect(typeof client.getHeldMessages).toBe('function');
    expect(typeof client.getThreatEvents).toBe('function');
  });

  it('returns a NEW instance on each call — never the cached global', () => {
    const first = getMimecastClientForTenant(FAKE_TENANT);
    const second = getMimecastClientForTenant(FAKE_TENANT);
    expect(second).not.toBe(first);
  });

  it('does not populate or replace the cached global getMimecastClient() instance', () => {
    process.env.MIMECAST_CLIENT_ID = 'id1';
    process.env.MIMECAST_CLIENT_SECRET = 'secret1';

    getMimecastClientForTenant(FAKE_TENANT);
    const global1 = getMimecastClient();
    const global2 = getMimecastClient();

    // The global singleton is unaffected by tenant-client construction —
    // still cached and independent of the tenant instance.
    expect(global2).toBe(global1);
    expect(global1).not.toBe(getMimecastClientForTenant(FAKE_TENANT));
  });

  it('does not throw when base_url is omitted (defaults to the Mimecast API host)', () => {
    expect(() => getMimecastClientForTenant({ client_id: 'tid', client_secret: 'tsecret' })).not.toThrow();
  });
});

describe('getHeldMessages date-scoping', () => {
  // Fake credentials only — never real mimecast_tenants values.
  const FAKE_TENANT = { client_id: 'tid', client_secret: 'tsecret', base_url: 'https://tenant.example' };

  it('includes start/end in the POST body data[0] when provided', async () => {
    const client = getMimecastClientForTenant(FAKE_TENANT);
    const requestSpy = vi
      .spyOn(client as any, 'request')
      .mockResolvedValue({ data: [], meta: { pagination: {} } });

    await client.getHeldMessages({
      recipient: 'r@x.test',
      start: '2026-07-14T00:00:00+0000',
      end: '2026-07-15T00:00:00+0000',
    });

    expect(requestSpy).toHaveBeenCalledTimes(1);
    const body: any = requestSpy.mock.calls[0][2];
    expect(body.data[0]).toMatchObject({
      admin: true,
      start: '2026-07-14T00:00:00+0000',
      end: '2026-07-15T00:00:00+0000',
      searchBy: { fieldName: 'recipient', value: 'r@x.test' },
    });
  });

  it('omits start/end from the POST body data[0] when not provided', async () => {
    const client = getMimecastClientForTenant(FAKE_TENANT);
    const requestSpy = vi
      .spyOn(client as any, 'request')
      .mockResolvedValue({ data: [], meta: { pagination: {} } });

    await client.getHeldMessages({ recipient: 'r@x.test' });

    expect(requestSpy).toHaveBeenCalledTimes(1);
    const body: any = requestSpy.mock.calls[0][2];
    expect(body.data[0]).not.toHaveProperty('start');
    expect(body.data[0]).not.toHaveProperty('end');
  });
});