import assert from 'node:assert/strict';
import { after, before, describe, it } from 'node:test';
import { randomUUID } from 'node:crypto';
import { AttemptPhase, AttemptStatus, UserRole } from '@prisma/client';
import { prisma } from '../src/lib/prisma.js';
import { AUDIT_ACTIONS } from '../src/modules/admin/auditActions.js';
import { PCQ_QUESTION_IDS } from '../src/modules/assessments/scoring/index.js';
import { isReverseScored } from '../src/modules/assessments/scoring/reverseScoring.js';
import { QUESTION_DIMENSION_MAP } from '../src/modules/assessments/scoring/dimensions.js';
import {
  assertNoSecrets,
  authHeader,
  createTestApp,
  isDatabaseAvailable,
  requestJson,
} from './helpers.js';

const app = createTestApp();
const createdUserIds: bigint[] = [];

async function trackUser(externalId: string | undefined) {
  if (!externalId) return;
  const user = await prisma.user.findUnique({ where: { externalId } });
  if (user) createdUserIds.push(user.id);
}

async function register(email: string, password = 'password12') {
  const result = await requestJson(app, '/auth/register', {
    method: 'POST',
    body: JSON.stringify({ email, password }),
  });
  await trackUser((result.body.data?.user as { id?: string } | undefined)?.id);
  return result;
}

async function promoteAndLogin(email: string): Promise<{ token: string; userId: bigint }> {
  const registered = await register(email);
  assert.equal(registered.status, 201);
  const externalId = (registered.body.data?.user as { id: string }).id;
  const user = await prisma.user.findUniqueOrThrow({ where: { externalId } });
  await prisma.user.update({ where: { id: user.id }, data: { role: UserRole.admin } });
  const login = await requestJson(app, '/auth/login', {
    method: 'POST',
    body: JSON.stringify({ email, password: 'password12' }),
  });
  assert.equal(login.status, 200);
  return {
    token: login.body.data?.sessionToken as string,
    userId: user.id,
  };
}

async function createFullAttempt(userId: bigint, phase: AttemptPhase, likert = 4) {
  const now = new Date();
  const answers = PCQ_QUESTION_IDS.map((questionId) => {
    const reverse = isReverseScored(questionId);
    const points = reverse ? 7 - likert : likert;
    return {
      questionId,
      rawValue: likert,
      points,
      dimension: QUESTION_DIMENSION_MAP[questionId]!,
      isReverseScored: reverse,
    };
  });

  const efficacy = answers.slice(0, 6).reduce((s, a) => s + a.points, 0);
  const hope = answers.slice(6, 12).reduce((s, a) => s + a.points, 0);
  const resilience = answers.slice(12, 18).reduce((s, a) => s + a.points, 0);
  const optimism = answers.slice(18, 24).reduce((s, a) => s + a.points, 0);
  const total = efficacy + hope + resilience + optimism;

  return prisma.assessmentAttempt.create({
    data: {
      userId,
      phase,
      status: AttemptStatus.scored,
      submittedAt: now,
      scoredAt: now,
      answers: { create: answers },
      scores: {
        create: [
          { metricKey: 'efficacy', rawScore: efficacy },
          { metricKey: 'hope', rawScore: hope },
          { metricKey: 'resilience', rawScore: resilience },
          { metricKey: 'optimism', rawScore: optimism },
          { metricKey: 'total', rawScore: total },
        ],
      },
    },
  });
}

describe('admin user assessments', () => {
  let dbAvailable = false;

  before(async () => {
    dbAvailable = await isDatabaseAvailable();
  });

  after(async () => {
    if (dbAvailable && createdUserIds.length > 0) {
      await prisma.auditLog.deleteMany({
        where: {
          OR: [
            { actorUserId: { in: createdUserIds } },
            { targetUserId: { in: createdUserIds } },
          ],
        },
      });
      await prisma.user.deleteMany({ where: { id: { in: createdUserIds } } });
    }
  });

  it('returns 401 without session', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }
    const { status, raw } = await requestJson(app, `/admin/users/${randomUUID()}/assessments`);
    assert.equal(status, 401);
    assertNoSecrets(raw);
  });

  it('returns 403 for a normal user', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }
    const registered = await register(`assess-user-${Date.now()}@example.com`);
    const token = registered.body.data?.sessionToken as string;
    const id = (registered.body.data?.user as { id: string }).id;
    const { status, body, raw } = await requestJson(app, `/admin/users/${id}/assessments`, {
      headers: authHeader(token),
    });
    assert.equal(status, 403);
    assert.equal(body.error?.code, 'FORBIDDEN');
    assertNoSecrets(raw);
  });

  it('returns 422 for invalid externalId', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }
    const { token } = await promoteAndLogin(`assess-invalid-${Date.now()}@example.com`);
    const { status, body, raw } = await requestJson(app, '/admin/users/not-a-uuid/assessments', {
      headers: authHeader(token),
    });
    assert.equal(status, 422);
    assert.equal(body.error?.code, 'VALIDATION_ERROR');
    assertNoSecrets(raw);
  });

  it('returns 404 for missing user', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }
    const { token } = await promoteAndLogin(`assess-missing-${Date.now()}@example.com`);
    const { status, body, raw } = await requestJson(
      app,
      `/admin/users/${randomUUID()}/assessments`,
      { headers: authHeader(token) },
    );
    assert.equal(status, 404);
    assert.equal(body.error?.code, 'NOT_FOUND');
    assertNoSecrets(raw);
  });

  it('returns empty phases when user has no attempts', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }
    const stamp = Date.now();
    const target = await register(`assess-empty-${stamp}@example.com`);
    const targetId = (target.body.data?.user as { id: string }).id;
    const { token } = await promoteAndLogin(`assess-empty-admin-${stamp}@example.com`);

    const { status, body, raw } = await requestJson(app, `/admin/users/${targetId}/assessments`, {
      headers: authHeader(token),
    });
    assert.equal(status, 200);
    assertNoSecrets(raw);
    const data = body.data as {
      pretest: { exists: boolean; answers: unknown[] };
      posttest: { exists: boolean; answers: unknown[] };
    };
    assert.equal(data.pretest.exists, false);
    assert.equal(data.posttest.exists, false);
    assert.equal(data.pretest.answers.length, 0);
    assert.equal(data.posttest.answers.length, 0);
  });

  it('returns pretest only, ordered answers, stored scores, reverse flags, and audit', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }

    const stamp = Date.now();
    const targetReg = await register(`assess-pre-${stamp}@example.com`);
    const targetId = (targetReg.body.data?.user as { id: string }).id;
    const target = await prisma.user.findUniqueOrThrow({ where: { externalId: targetId } });
    await createFullAttempt(target.id, AttemptPhase.pre, 4);

    const { token, userId: adminId } = await promoteAndLogin(
      `assess-pre-admin-${stamp}@example.com`,
    );

    const { status, body, raw } = await requestJson(app, `/admin/users/${targetId}/assessments`, {
      headers: authHeader(token),
    });
    assert.equal(status, 200);
    assertNoSecrets(raw);

    const data = body.data as {
      user: { id: string; email: string | null };
      pretest: {
        exists: boolean;
        scores: Record<string, number | null>;
        answers: Array<{
          questionId: string;
          questionNumber: number;
          isReverseScored: boolean;
          points: number;
          rawValue: number;
        }>;
        answerCount: number;
      };
      posttest: { exists: boolean };
    };

    assert.equal(data.user.id, targetId);
    assert.equal(data.pretest.exists, true);
    assert.equal(data.posttest.exists, false);
    assert.equal(data.pretest.answerCount, 24);
    assert.equal(data.pretest.answers.length, 24);
    assert.equal(data.pretest.answers[0]?.questionId, 'pcq_01');
    assert.equal(data.pretest.answers[0]?.questionNumber, 1);
    assert.equal(data.pretest.answers[23]?.questionId, 'pcq_24');
    assert.equal(data.pretest.answers[23]?.questionNumber, 24);

    const reverseIds = data.pretest.answers
      .filter((a) => a.isReverseScored)
      .map((a) => a.questionId);
    assert.deepEqual(reverseIds, ['pcq_13', 'pcq_20', 'pcq_23']);

    const reverseAnswer = data.pretest.answers.find((a) => a.questionId === 'pcq_13');
    assert.equal(reverseAnswer?.rawValue, 4);
    assert.equal(reverseAnswer?.points, 3);

    assert.equal(data.pretest.scores.total, 93);
    assert.equal(data.pretest.scores.efficacy, 24);
    assert.equal(typeof data.pretest.scores.hope, 'number');

    assert.equal('passwordHash' in data, false);
    assert.equal('messages' in data, false);
    assert.equal('assignments' in data, false);

    const audit = await prisma.auditLog.findFirst({
      where: {
        actorUserId: adminId,
        targetUserId: target.id,
        action: AUDIT_ACTIONS.ADMIN_VIEW_ASSESSMENT,
      },
      orderBy: { createdAt: 'desc' },
    });
    assert.ok(audit);
    const meta = JSON.stringify(audit.metadata ?? {});
    assert.match(meta, /"view":"assessment"/);
    assert.equal(/passwordHash|tokenHash|rawValue|pcq_01/i.test(meta), false);
  });

  it('separates pre and post attempts', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }

    const stamp = Date.now();
    const targetReg = await register(`assess-both-${stamp}@example.com`);
    const targetId = (targetReg.body.data?.user as { id: string }).id;
    const target = await prisma.user.findUniqueOrThrow({ where: { externalId: targetId } });
    await createFullAttempt(target.id, AttemptPhase.pre, 3);
    await createFullAttempt(target.id, AttemptPhase.post, 5);

    const { token } = await promoteAndLogin(`assess-both-admin-${stamp}@example.com`);
    const { status, body, raw } = await requestJson(app, `/admin/users/${targetId}/assessments`, {
      headers: authHeader(token),
    });
    assert.equal(status, 200);
    assertNoSecrets(raw);
    const data = body.data as {
      pretest: { exists: boolean; phase: string; scores: { total: number | null } };
      posttest: { exists: boolean; phase: string; scores: { total: number | null } };
    };
    assert.equal(data.pretest.exists, true);
    assert.equal(data.posttest.exists, true);
    assert.equal(data.pretest.phase, 'pre');
    assert.equal(data.posttest.phase, 'post');
    assert.notEqual(data.pretest.scores.total, data.posttest.scores.total);
  });

  it('handles attempt without scores without inventing values', async (t) => {
    if (!dbAvailable) {
      t.skip('MySQL is not running');
      return;
    }

    const stamp = Date.now();
    const targetReg = await register(`assess-noscore-${stamp}@example.com`);
    const targetId = (targetReg.body.data?.user as { id: string }).id;
    const target = await prisma.user.findUniqueOrThrow({ where: { externalId: targetId } });
    const now = new Date();
    await prisma.assessmentAttempt.create({
      data: {
        userId: target.id,
        phase: AttemptPhase.pre,
        status: AttemptStatus.submitted,
        submittedAt: now,
        scoredAt: now,
        answers: {
          create: [
            {
              questionId: 'pcq_01',
              rawValue: 2,
              points: 2,
              dimension: 'efficacy',
              isReverseScored: false,
            },
          ],
        },
      },
    });

    const { token } = await promoteAndLogin(`assess-noscore-admin-${stamp}@example.com`);
    const { status, body, raw } = await requestJson(app, `/admin/users/${targetId}/assessments`, {
      headers: authHeader(token),
    });
    assert.equal(status, 200);
    assertNoSecrets(raw);
    const pretest = (body.data as { pretest: { scores: unknown; answers: unknown[]; status: string } })
      .pretest;
    assert.equal(pretest.scores, null);
    assert.equal(pretest.answers.length, 1);
    assert.equal(pretest.status, 'submitted');
  });
});