/**
 * Engine integration test - drives `runAlertEngineForPorts` against
 * seeded conditions and asserts: (1) correct alerts upsert, (2) running
 * twice doesn't duplicate, (3) mutating state auto-resolves stale alerts.
 *
 * Socket emissions are stubbed via vi.mock so the test stays offline.
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import { and, eq, isNull } from 'drizzle-orm';

vi.mock('@/lib/socket/server', () => ({
  emitToRoom: vi.fn(),
}));

import { db } from '@/lib/db';
import { alerts } from '@/lib/db/schema/insights';
import { interests } from '@/lib/db/schema/interests';
import { berthTenancies } from '@/lib/db/schema/tenancies';
import { documents } from '@/lib/db/schema/documents';
import { interestContactLog } from '@/lib/db/schema/operations';
import { migrationSourceLinks } from '@/lib/db/schema/migration';
import { runAlertEngineForPorts } from '@/lib/services/alert-engine';
import { makePort, makeClient, makeBerth, makeYacht } from '../helpers/factories';

async function clearAlerts(portId: string) {
  await db.delete(alerts).where(eq(alerts.portId, portId));
}

async function listOpenAlerts(portId: string, ruleId: string) {
  return db
    .select()
    .from(alerts)
    .where(and(eq(alerts.portId, portId), eq(alerts.ruleId, ruleId), isNull(alerts.resolvedAt)));
}

/** Mark an interest as bulk-imported via the migration ledger. */
async function markImported(interestId: string) {
  await db.insert(migrationSourceLinks).values({
    sourceSystem: 'nocodb_interests',
    sourceId: `legacy-${interestId}`,
    targetEntityType: 'interest',
    targetEntityId: interestId,
    appliedId: 'test-apply',
  });
}

/** A genuine in-system follow-up: a logged contact at `occurredAt`. */
async function logContact(portId: string, interestId: string, occurredAt: Date) {
  await db.insert(interestContactLog).values({
    portId,
    interestId,
    occurredAt,
    channel: 'phone',
    direction: 'outbound',
    summary: 'Test follow-up',
    createdBy: 'seed',
  });
}

describe('alert engine', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it('reservation.no_agreement fires for active reservation older than 3 days without agreement', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const berth = await makeBerth({ portId: port.id });
    const yacht = await makeYacht({
      portId: port.id,
      ownerType: 'client',
      ownerId: client.id,
      overrides: { name: 'M/Y Test' },
    });
    const fourDaysAgo = new Date(Date.now() - 4 * 86_400_000);
    const [resv] = await db
      .insert(berthTenancies)
      .values({
        portId: port.id,
        berthId: berth.id,
        clientId: client.id,
        yachtId: yacht.id,
        status: 'active',
        startDate: new Date(),
        createdBy: 'seed',
        createdAt: fourDaysAgo,
      })
      .returning();
    expect(resv).toBeDefined();

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    const open = await listOpenAlerts(port.id, 'reservation.no_agreement');
    expect(open).toHaveLength(1);
    expect(open[0]!.entityId).toBe(resv!.id);
    expect(open[0]!.severity).toBe('warning');
  });

  it('does not duplicate on a second sweep', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const berth = await makeBerth({ portId: port.id });
    const yacht = await makeYacht({
      portId: port.id,
      ownerType: 'client',
      ownerId: client.id,
    });
    const stale = new Date(Date.now() - 10 * 86_400_000);
    await db.insert(berthTenancies).values({
      portId: port.id,
      berthId: berth.id,
      clientId: client.id,
      yachtId: yacht.id,
      status: 'active',
      startDate: new Date(),
      createdBy: 'seed',
      createdAt: stale,
    });

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);
    await runAlertEngineForPorts([port.id]);

    const open = await listOpenAlerts(port.id, 'reservation.no_agreement');
    expect(open).toHaveLength(1);
  });

  it('auto-resolves an open alert when the underlying condition clears', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const berth = await makeBerth({ portId: port.id });
    const yacht = await makeYacht({
      portId: port.id,
      ownerType: 'client',
      ownerId: client.id,
    });
    const tenDaysAgo = new Date(Date.now() - 10 * 86_400_000);
    const [resv] = await db
      .insert(berthTenancies)
      .values({
        portId: port.id,
        berthId: berth.id,
        clientId: client.id,
        yachtId: yacht.id,
        status: 'active',
        startDate: new Date(),
        createdBy: 'seed',
        createdAt: tenDaysAgo,
      })
      .returning();

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);
    expect(await listOpenAlerts(port.id, 'reservation.no_agreement')).toHaveLength(1);

    // Add an agreement document - condition no longer fires.
    await db.insert(documents).values({
      portId: port.id,
      tenancyId: resv!.id,
      documentType: 'reservation_agreement',
      title: 'Reservation Agreement',
      status: 'sent',
      createdBy: 'seed',
    });
    await runAlertEngineForPorts([port.id]);

    expect(await listOpenAlerts(port.id, 'reservation.no_agreement')).toHaveLength(0);
    const allRows = await db
      .select()
      .from(alerts)
      .where(and(eq(alerts.portId, port.id), eq(alerts.ruleId, 'reservation.no_agreement')));
    expect(allRows).toHaveLength(1);
    expect(allRows[0]!.resolvedAt).not.toBeNull();
  });

  it('interest.stale fires for worked leads gone quiet >14d', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const stale = new Date(Date.now() - 30 * 86_400_000);
    const [interest] = await db
      .insert(interests)
      .values({
        portId: port.id,
        clientId: client.id,
        pipelineStage: 'qualified',
        dateLastContact: stale,
        createdAt: stale,
        updatedAt: stale,
      })
      .returning();
    // A real in-system follow-up 30 days ago → this is a worked-then-quiet lead,
    // not an untouched import.
    await logContact(port.id, interest!.id, stale);

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    const open = await listOpenAlerts(port.id, 'interest.stale');
    expect(open).toHaveLength(1);
    expect(open[0]!.entityId).toBe(interest!.id);
    expect(open[0]!.severity).toBe('info');
    // A worked lead must not also fire the new-untouched rule.
    expect(await listOpenAlerts(port.id, 'interest.no_activity')).toHaveLength(0);
  });

  it('interest.stale does NOT fire for imported, never-touched interests', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const migrationTime = new Date(Date.now() - 20 * 86_400_000);
    const legacyDate = new Date(Date.now() - 3 * 365 * 86_400_000); // ~3yr back-dated
    const [interest] = await db
      .insert(interests)
      .values({
        portId: port.id,
        clientId: client.id,
        pipelineStage: 'qualified',
        dateLastContact: legacyDate, // back-dated by the migration
        createdAt: migrationTime,
        updatedAt: migrationTime,
      })
      .returning();
    await markImported(interest!.id);

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    // Imported + never touched in-system → neither interest rule should fire.
    expect(await listOpenAlerts(port.id, 'interest.stale')).toHaveLength(0);
    expect(await listOpenAlerts(port.id, 'interest.no_activity')).toHaveLength(0);
  });

  it('interest.no_activity fires for new, non-imported, untouched interests >14d old', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const created = new Date(Date.now() - 20 * 86_400_000);
    const [interest] = await db
      .insert(interests)
      .values({
        portId: port.id,
        clientId: client.id,
        pipelineStage: 'enquiry',
        dateLastContact: null,
        createdAt: created,
        updatedAt: created,
      })
      .returning();

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    const open = await listOpenAlerts(port.id, 'interest.no_activity');
    expect(open).toHaveLength(1);
    expect(open[0]!.entityId).toBe(interest!.id);
    expect(open[0]!.severity).toBe('info');
    expect(await listOpenAlerts(port.id, 'interest.stale')).toHaveLength(0);
  });

  it('interest.high_value_silent fires for hot leads silent >7d', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const stale = new Date(Date.now() - 10 * 86_400_000);
    await db.insert(interests).values({
      portId: port.id,
      clientId: client.id,
      pipelineStage: 'qualified',
      leadCategory: 'hot_lead',
      dateLastContact: stale,
      updatedAt: stale,
    });

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    const open = await listOpenAlerts(port.id, 'interest.high_value_silent');
    expect(open).toHaveLength(1);
    expect(open[0]!.severity).toBe('critical');
  });

  it('interest.high_value_silent skips imported, never-touched hot leads', async () => {
    const port = await makePort();
    const client = await makeClient({ portId: port.id });
    const migrationTime = new Date(Date.now() - 20 * 86_400_000);
    const legacyDate = new Date(Date.now() - 3 * 365 * 86_400_000);
    const [interest] = await db
      .insert(interests)
      .values({
        portId: port.id,
        clientId: client.id,
        pipelineStage: 'qualified',
        leadCategory: 'hot_lead',
        dateLastContact: legacyDate,
        createdAt: migrationTime,
        updatedAt: migrationTime,
      })
      .returning();
    await markImported(interest!.id);

    await clearAlerts(port.id);
    await runAlertEngineForPorts([port.id]);

    expect(await listOpenAlerts(port.id, 'interest.high_value_silent')).toHaveLength(0);
  });

  it('engine reports rule errors without crashing the sweep', async () => {
    const port = await makePort();
    const summary = await runAlertEngineForPorts([port.id]);
    expect(summary.portsScanned).toBe(1);
    expect(summary.rulesEvaluated).toBeGreaterThan(0);
    // No conditions seeded - no rules should fail.
    expect(summary.errors).toHaveLength(0);
  });
});