/**
 * Smart shop — temporary SQLite only.
 */
import assert from 'node:assert/strict'
import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { ValidationPipe } from '@nestjs/common'
import { Test } from '@nestjs/testing'
import { FastifyAdapter, NestFastifyApplication } from '@nestjs/platform-fastify'
import { ApiExceptionFilter } from '../src/common/filters/api-exception.filter'
import { finalCost } from '../src/gold-land/smart-shop/shop.math'
import { gradeSmartShopSubmission } from '../src/gold-land/smart-shop/shop.grader'
import { smartShopMission } from '../src/gold-land/smart-shop/shop.mission'
import { GoldLandProgressionService } from '../src/gold-land/services/progression.service'
import type { DatabaseService } from '../src/database/database.service'
import { createDefaultUserState } from '../src/shared/catalog/default-user-state'

const USER = 'shop-test-user'
const testDir = mkdtempSync(join(tmpdir(), 'gold-land-shop-'))
process.env.DB_PATH = join(testDir, 'test.db')
process.env.NODE_ENV = 'test'
process.env.PORT = '3998'
process.env.JWT_SECRET = 'gold-land-dev-secret-change-in-production'

const correct = [
  { questionId: 'notebook-choice', answerId: 'b' },
  { questionId: 'notebook-why', answerId: 'fits-and-cheaper' },
  { questionId: 'discount-choice', answerId: 'b' },
  { questionId: 'discount-why', answerId: 'pay-amount' },
  { questionId: 'info-choice', answerId: 'ask' },
  { questionId: 'info-why', answerId: 'incomplete' },
]
const wrong = ['a', 'cheapest-tag', 'a', 'bigger-discount', 'buy-now', 'hurry']

function withCount(count: number) {
  return correct.map((answer, index) => (index < count ? answer : { questionId: answer.questionId, answerId: wrong[index]! }))
}

async function createApp(): Promise<NestFastifyApplication> {
  const { AppModule } = await import('../src/app.module')
  const moduleRef = await Test.createTestingModule({ imports: [AppModule] }).compile()
  const app = moduleRef.createNestApplication<NestFastifyApplication>(new FastifyAdapter())
  app.useGlobalPipes(new ValidationPipe({ transform: true, whitelist: true, forbidNonWhitelisted: true }))
  app.useGlobalFilters(new ApiExceptionFilter())
  await app.init()
  await app.getHttpAdapter().getInstance().ready()
  return app
}

async function run() {
  assert.equal(finalCost({ price: 40, delivery: 5 }), 45)
  assert.equal(finalCost({ price: 38, delivery: 12 }), 50)
  assert.equal(finalCost({ price: 30, delivery: 0 }), 30)
  assert.equal(finalCost({ price: 28, delivery: 0 }), 28)
  assert.equal(finalCost({ price: 45, delivery: null }), null)
  assert.notEqual(finalCost({ price: 45, delivery: null }), 0)

  const scores = [0, 1, 2, 3, 4, 5, 6].map((count) => gradeSmartShopSubmission(withCount(count)).score)
  assert.deepEqual(scores, [0, 17, 33, 50, 67, 83, 100])
  assert.throws(() => gradeSmartShopSubmission(correct.slice(0, 5)))
  assert.throws(() => gradeSmartShopSubmission([...correct, correct[0]!]))
  assert.throws(() => gradeSmartShopSubmission(correct.map((answer, index) => (index === 0 ? { ...answer, answerId: 'ask' } : answer))))
  assert.throws(() => gradeSmartShopSubmission(correct.map((answer) => ({ ...answer, price: 1 }))))

  const payload = JSON.stringify(smartShopMission)
  assert.equal(payload.includes('correctAnswerId'), false)
  assert.equal(payload.includes('"explanation"'), false)
  const info = smartShopMission.missions[2]?.cards[0]
  assert.equal(info?.delivery, null)
  assert.equal(info?.finalCost, null)

  const app = await createApp()
  const database = app.get((await import('../src/database/database.service')).DatabaseService) as DatabaseService
  const progression = app.get(GoldLandProgressionService)
  const db = database.getDb()
  try {
    const now = new Date().toISOString()
    db.prepare('INSERT INTO users (id, state_json, updated_at) VALUES (?, ?, ?)').run(USER, JSON.stringify(createDefaultUserState(USER)), now)
    const insert = db.prepare(`
      INSERT INTO user_level_progress (
        user_id, level_id, best_score, stars, attempts_count, started_at, completed_at, updated_at
      ) VALUES (?, ?, 80, 2, 1, ?, ?, ?)
    `)
    for (let id = 1; id <= 9; id += 1) insert.run(USER, id, now, now, now)
    assert.throws(() => progression.startLevel(USER, 11))
    insert.run(USER, 10, now, now, now)
    assert.equal(progression.buildLevelItems(USER).find((level) => level.id === 11)?.status, 'available')
    assert.equal(progression.buildLevelItems(USER).find((level) => level.id === 12)?.status, 'locked')

    assert.throws(() => progression.completeLevel(USER, 11, { answers: withCount(3) }))
    const first = progression.completeLevel(USER, 11, { answers: withCount(4) })
    assert.equal(first.score, 67)
    assert.equal(first.stars, 1)
    assert.equal(first.reward.xp, 45 + 5)
    assert.equal(first.reward.coins, 18 + 3)
    const replay = progression.completeLevel(USER, 11, { answers: withCount(4) })
    assert.equal(replay.reward.coins, 0)
    const improved = progression.completeLevel(USER, 11, { answers: correct })
    assert.equal(improved.score, 100)
    assert.equal(improved.stars, 3)
    assert.equal(improved.reward.xp, 10)
    assert.equal(improved.reward.coins, 6)
    assert.equal(progression.buildLevelItems(USER).find((level) => level.id === 12)?.status, 'available')
    assert.equal(progression.buildLevelItems(USER).find((level) => level.id === 13)?.status, 'locked')

    const parallelId = 'shop-parallel-user'
    db.prepare('INSERT INTO users (id, state_json, updated_at) VALUES (?, ?, ?)').run(parallelId, JSON.stringify(createDefaultUserState(parallelId)), now)
    for (let id = 1; id <= 10; id += 1) insert.run(parallelId, id, now, now, now)
    const { JwtService } = await import('@nestjs/jwt')
    const token = app.get(JwtService).sign({ userId: parallelId })
    const [left, right] = await Promise.all([
      app.inject({ method: 'POST', url: '/api/gold-land/levels/11/complete', headers: { authorization: `Bearer ${token}` }, payload: { answers: correct } }),
      app.inject({ method: 'POST', url: '/api/gold-land/levels/11/complete', headers: { authorization: `Bearer ${token}` }, payload: { answers: correct } }),
    ])
    assert.equal(left.statusCode, 200)
    assert.equal(right.statusCode, 200)
    const bodies = [left, right].map((response) => JSON.parse(response.payload) as { reward: { coins: number; xp: number } })
    assert.equal(bodies.reduce((sum, body) => sum + body.reward.coins, 0), 18 + 9)
    assert.equal(bodies.reduce((sum, body) => sum + body.reward.xp, 0), 45 + 15)
    const bad = await app.inject({
      method: 'POST',
      url: '/api/gold-land/levels/11/complete',
      headers: { authorization: `Bearer ${token}` },
      payload: { answers: [{ questionId: 'notebook-choice', answerId: 'b', score: 100 }] },
    })
    assert.equal(bad.statusCode, 400)
    console.log('smart-shop tests passed')
  } finally {
    await app.close()
    try { rmSync(testDir, { recursive: true, force: true }) } catch { /* ignore */ }
  }
}

run().catch((error) => {
  console.error(error)
  process.exit(1)
})