import { beforeEach, describe, expect, it, mock, vi } from 'bun:test';
import { Hono } from 'hono';

const db = {
  group: {
    findUnique: mock(),
  },
  classSession: {
    findMany: mock(),
  },
  attendee: {
    findMany: mock(),
    findFirst: mock(),
    findUnique: mock(),
    update: mock(),
  },
  attendance: {
    findMany: mock(),
  },
  slotRelease: {
    count: mock(),
  },
};

mock.module('@/lib/prisma', () => ({
  default: db,
  getPrismaClient: mock(),
  UnitOfWork: class {
    executeResult = mock(async (cb: (tx: unknown) => Promise<unknown>) => cb(db));
    execute = mock(async (cb: (tx: unknown) => Promise<unknown>) => cb(db));
  },
}));

import prisma from '@/lib/prisma';
import { analyticsRoutes, studentStatusRoutes } from '@/modules/analytics';

const userId = 'user-1';
const DAY_MS = 24 * 60 * 60 * 1000;
const now = Date.now();
const at = (offsetDays: number) => new Date(now - offsetDays * DAY_MS).toISOString();

function makeApp(userValue: unknown) {
  const app = new Hono();
  app.use('*', async (c, next) => {
    c.set('user', userValue as never);
    await next();
  });
  app.route('/groups', analyticsRoutes);
  app.route('/students', studentStatusRoutes);
  return app;
}

function makeGroup(overrides: Record<string, unknown> = {}) {
  return {
    id: 'group-1',
    name: 'Funcional',
    createdById: userId,
    members: [],
    ...overrides,
  };
}

describe('analytics routes', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe('GET /groups/:groupId/analytics', () => {
    it('calcula métricas de asistencia de los últimos 30 días', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.classSession.findMany.mockResolvedValue([{ id: 's-1' }, { id: 's-2' }]);
      prisma.attendance.findMany.mockResolvedValue([
        { status: 'PRESENT' },
        { status: 'PRESENT' },
        { status: 'ABSENT' },
        { status: 'EXCUSED' },
      ]);
      prisma.slotRelease.count.mockResolvedValue(2);

      const res = await makeApp({ id: userId }).request('/groups/group-1/analytics');

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({
        attendanceRate: 50,
        totalPresent: 2,
        totalClasses: 2,
        recoveredSlots: 2,
      });
    });

    it('devuelve 0 en todas las métricas sin clases en el período', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.classSession.findMany.mockResolvedValue([]);
      prisma.attendance.findMany.mockResolvedValue([]);
      prisma.slotRelease.count.mockResolvedValue(0);

      const res = await makeApp({ id: userId }).request('/groups/group-1/analytics');

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({
        attendanceRate: 0,
        totalPresent: 0,
        totalClasses: 0,
        recoveredSlots: 0,
      });
    });

    it('prohíbe el acceso a quien no es owner ni miembro', async () => {
      prisma.group.findUnique.mockResolvedValue(
        makeGroup({ createdById: 'someone-else' }),
      );

      const res = await makeApp({ id: userId }).request('/groups/group-1/analytics');

      expect(res.status).toBe(403);
      expect(await res.json()).toMatchObject({ code: 'group_access_denied' });
    });

    it('devuelve 404 si el grupo no existe', async () => {
      prisma.group.findUnique.mockResolvedValue(null);

      const res = await makeApp({ id: userId }).request('/groups/group-1/analytics');

      expect(res.status).toBe(404);
      expect(await res.json()).toMatchObject({ code: 'not_found' });
    });

    it('rechaza requests sin sesión', async () => {
      const res = await makeApp(null).request('/groups/group-1/analytics');

      expect(res.status).toBe(401);
    });
  });

  describe('GET /groups/:groupId/students-at-risk', () => {
    const sessions = [at(0), at(7), at(14), at(21)];

    it('clasifica HIGH y MEDIUM según el historial de asistencia', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.classSession.findMany.mockResolvedValue(sessions.map((startsAt) => ({ id: 's', startsAt })));
      prisma.attendee.findMany.mockResolvedValue([
        { id: 'a-1', fullName: 'Ana Pérez', phone: '+521111111111' },
        { id: 'a-2', fullName: 'Bruno Díaz', phone: null },
      ]);
      prisma.attendance.findMany.mockResolvedValue([
        { attendeeId: 'a-1', status: 'ABSENT', classSession: { startsAt: new Date(at(0)) } },
        { attendeeId: 'a-1', status: 'ABSENT', classSession: { startsAt: new Date(at(7)) } },
        { attendeeId: 'a-1', status: 'ABSENT', classSession: { startsAt: new Date(at(14)) } },
        { attendeeId: 'a-1', status: 'PRESENT', classSession: { startsAt: new Date(at(21)) } },
        { attendeeId: 'a-2', status: 'ABSENT', classSession: { startsAt: new Date(at(0)) } },
        { attendeeId: 'a-2', status: 'ABSENT', classSession: { startsAt: new Date(at(7)) } },
        { attendeeId: 'a-2', status: 'PRESENT', classSession: { startsAt: new Date(at(14)) } },
        { attendeeId: 'a-2', status: 'PRESENT', classSession: { startsAt: new Date(at(21)) } },
      ]);

      const res = await makeApp({ id: userId }).request('/groups/group-1/students-at-risk');

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({
        groupName: 'Funcional',
        data: [
          {
            attendeeId: 'a-1',
            fullName: 'Ana Pérez',
            phone: '+521111111111',
            riskLevel: 'HIGH',
            consecutiveAbsences: 3,
            lastAttendedAt: at(21),
            monthlyAttendanceRate: 25,
          },
          {
            attendeeId: 'a-2',
            fullName: 'Bruno Díaz',
            phone: null,
            riskLevel: 'MEDIUM',
            consecutiveAbsences: 2,
            lastAttendedAt: at(14),
            monthlyAttendanceRate: 50,
          },
        ],
      });
    });

    it('devuelve lista vacía cuando nadie está en riesgo', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.classSession.findMany.mockResolvedValue(sessions.map((startsAt) => ({ id: 's', startsAt })));
      prisma.attendee.findMany.mockResolvedValue([
        { id: 'a-1', fullName: 'Ana Pérez', phone: null },
      ]);
      prisma.attendance.findMany.mockResolvedValue([
        { attendeeId: 'a-1', status: 'PRESENT', classSession: { startsAt: new Date(at(0)) } },
        { attendeeId: 'a-1', status: 'PRESENT', classSession: { startsAt: new Date(at(7)) } },
      ]);

      const res = await makeApp({ id: userId }).request('/groups/group-1/students-at-risk');

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({ groupName: 'Funcional', data: [] });
    });
  });

  describe('GET /groups/:groupId/attendees/:attendeeId/history', () => {
    it('devuelve el historial de presentismo con su porcentaje', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.attendee.findFirst.mockResolvedValue({ id: 'a-1', fullName: 'Ana Pérez' });
      prisma.classSession.findMany.mockResolvedValue([
        { id: 's-2', startsAt: new Date(at(7)) },
        { id: 's-1', startsAt: new Date(at(0)) },
      ]);
      prisma.attendance.findMany.mockResolvedValue([
        { classSessionId: 's-1', status: 'PRESENT' },
        { classSessionId: 's-2', status: 'ABSENT' },
      ]);

      const res = await makeApp({ id: userId }).request(
        '/groups/group-1/attendees/a-1/history',
      );

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({
        attendeeId: 'a-1',
        fullName: 'Ana Pérez',
        groupId: 'group-1',
        groupName: 'Funcional',
        attendanceRate: 50,
        sessions: [
          { classSessionId: 's-1', startsAt: at(0), status: 'PRESENT' },
          { classSessionId: 's-2', startsAt: at(7), status: 'ABSENT' },
        ],
      });
    });

    it('devuelve 404 si el alumno no pertenece al grupo', async () => {
      prisma.group.findUnique.mockResolvedValue(makeGroup());
      prisma.attendee.findFirst.mockResolvedValue(null);

      const res = await makeApp({ id: userId }).request(
        '/groups/group-1/attendees/nope/history',
      );

      expect(res.status).toBe(404);
      expect(await res.json()).toMatchObject({ code: 'not_found' });
    });
  });

  describe('POST /students/:studentId/status', () => {
    function makeAttendee(status: string, overrides: Record<string, unknown> = {}) {
      return {
        id: 'a-1',
        status,
        group: { createdById: userId, members: [] },
        ...overrides,
      };
    }

    it('cambia el estado del alumno', async () => {
      prisma.attendee.findUnique.mockResolvedValue(makeAttendee('ACTIVE'));
      prisma.attendee.update.mockResolvedValue({ id: 'a-1', status: 'DROPPED' });

      const res = await makeApp({ id: userId }).request('/students/a-1/status', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: 'DROPPED' }),
      });

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({ attendeeId: 'a-1', status: 'DROPPED' });
      expect(prisma.attendee.update).toHaveBeenCalledWith({
        where: { id: 'a-1' },
        data: { status: 'DROPPED' },
        select: { id: true, status: true },
      });
    });

    it('es idempotente si el estado no cambia', async () => {
      prisma.attendee.findUnique.mockResolvedValue(makeAttendee('PAUSED'));

      const res = await makeApp({ id: userId }).request('/students/a-1/status', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: 'PAUSED' }),
      });

      expect(res.status).toBe(200);
      expect(await res.json()).toEqual({ attendeeId: 'a-1', status: 'PAUSED' });
      expect(prisma.attendee.update).not.toHaveBeenCalled();
    });

    it('prohíbe el acceso a quien no es owner ni miembro', async () => {
      prisma.attendee.findUnique.mockResolvedValue(
        makeAttendee('ACTIVE', { group: { createdById: 'someone-else', members: [] } }),
      );

      const res = await makeApp({ id: userId }).request('/students/a-1/status', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: 'PAUSED' }),
      });

      expect(res.status).toBe(403);
      expect(await res.json()).toMatchObject({ code: 'group_access_denied' });
    });

    it('rechaza estados fuera del contrato', async () => {
      const res = await makeApp({ id: userId }).request('/students/a-1/status', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: 'HOLD' }),
      });

      expect(res.status).toBe(400);
      expect(prisma.attendee.update).not.toHaveBeenCalled();
    });

    it('rechaza requests sin sesión', async () => {
      const res = await makeApp(null).request('/students/a-1/status', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ status: 'ACTIVE' }),
      });

      expect(res.status).toBe(401);
    });
  });
});