/**
 * Castle exam — 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 { gradeCastleExam } from '../src/gold-land/castle-exam/castle.grader'
import { castleExamPublic, getCastleQuestionBank } from '../src/gold-land/castle-exam/castle.mission'
import { GOLD_LAND_LEVELS } from '../src/gold-land/levels/levels'
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 = 'castle-test-user'
const testDir = mkdtempSync(join(tmpdir(), 'gold-land-castle-'))
process.env.DB_PATH = join(testDir, 'test.db')
process.env.NODE_ENV = 'test'
process.env.PORT = '4001'
process.env.JWT_SECRET = 'gold-land-dev-secret-change-in-production'

const correctIds = ['exchange', 'regular', 'water', 'moves', 'no', 'less', 'valid', 'keep', 'no', '121', 'b', '6']

function answersFor(count: number) {
  return getCastleQuestionBank().map((question, index) => ({
    questionId: question.id,
    answerId: index < count ? question.correctOptionId : question.options.find((option) => option.id !== question.correctOptionId)!.id,
  }))
}

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() {
  const scores = Array.from({ length: 13 }, (_, count) => gradeCastleExam(answersFor(count)).score)
  assert.deepEqual(scores, [0, 8, 17, 25, 33, 42, 50, 58, 67, 75, 83, 92, 100])
  assert.equal(gradeCastleExam(answersFor(7)).feedback.completed, false)
  assert.equal(gradeCastleExam(answersFor(8)).feedback.completed, true)
  assert.equal(JSON.stringify(castleExamPublic).includes('correctOptionId'), false)
  assert.equal(JSON.stringify(castleExamPublic).includes('explanation'), false)
  assert.deepEqual(castleExamPublic.questions.map((question) => question.sourceLevelId), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
  assert.throws(() => gradeCastleExam(answersFor(12).slice(0, 11)))
  assert.throws(() => gradeCastleExam([...answersFor(12), answersFor(1)[0]!]))
  assert.throws(() => gradeCastleExam(answersFor(12).map((answer, index) => (index === 0 ? { ...answer, answerId: 'nope' } : answer))))
  assert.throws(() => gradeCastleExam(answersFor(12).map((answer) => ({ ...answer, score: 100 }))))
  assert.deepEqual(correctIds, getCastleQuestionBank().map((question) => question.correctOptionId))

  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 (?, ?, 100, 3, 1, ?, ?, ?)
    `)
    for (let id = 1; id <= 11; id += 1) insert.run(USER, id, now, now, now)
    assert.throws(() => progression.startLevel(USER, 13))
    insert.run(USER, 12, now, now, now)
    assert.equal(progression.buildLevelItems(USER).find((level) => level.id === 13)?.status, 'available')
    const coinsOf = () => JSON.parse((db.prepare('SELECT state_json FROM users WHERE id = ?').get(USER) as { state_json: string }).state_json).coins as number
    const beforeCoins = coinsOf()
    const failed = progression.completeLevel(USER, 13, { answers: answersFor(7) })
    assert.equal(failed.score, 58)
    assert.equal(failed.stars, 0)
    assert.equal(failed.reward.coins, 0)
    assert.equal(failed.unlockedLevelId, null)
    assert.equal(failed.feedback && 'completed' in failed.feedback && failed.feedback.completed, false)
    const row = db.prepare('SELECT completed_at FROM user_level_progress WHERE user_id = ? AND level_id = 13').get(USER) as { completed_at: string | null } | undefined
    assert.equal(row?.completed_at ?? null, null)
    assert.equal(coinsOf(), beforeCoins)

    const first = progression.completeLevel(USER, 13, { answers: answersFor(8) })
    assert.equal(first.score, 67)
    assert.equal(first.stars, 1)
    assert.equal(first.reward.xp, 100 + 5)
    assert.equal(first.reward.coins, 50 + 3)
    assert.equal(first.unlockedLevelId, null)
    const saved = db.prepare('SELECT best_score, stars, completed_at FROM user_level_progress WHERE user_id = ? AND level_id = 13').get(USER) as { best_score: number; stars: number; completed_at: string }
    const afterPass = progression.completeLevel(USER, 13, { answers: answersFor(7) })
    assert.equal(afterPass.score, 58)
    assert.equal(afterPass.reward.coins, 0)
    assert.equal(afterPass.feedback && 'completed' in afterPass.feedback && afterPass.feedback.completed, false)
    assert.equal(afterPass.previousStars, 1)
    const still = db.prepare('SELECT best_score, stars, completed_at FROM user_level_progress WHERE user_id = ? AND level_id = 13').get(USER) as { best_score: number; stars: number; completed_at: string }
    assert.equal(still.best_score, saved.best_score)
    assert.equal(still.stars, saved.stars)
    assert.equal(still.completed_at, saved.completed_at)
    const replay = progression.completeLevel(USER, 13, { answers: answersFor(8) })
    assert.equal(replay.reward.coins, 0)
    const improved = progression.completeLevel(USER, 13, { answers: answersFor(12) })
    assert.equal(improved.score, 100)
    assert.equal(improved.stars, 3)
    assert.equal(improved.reward.xp, 10)
    assert.equal(improved.reward.coins, 6)
    assert.equal(improved.unlockedLevelId, null)
    assert.equal(GOLD_LAND_LEVELS.length, 13)
    assert.equal(progression.buildLevelItems(USER).some((level) => level.id === 14), false)

    const parallelId = 'castle-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 <= 12; id += 1) insert.run(parallelId, id, now, now, now)
    const { JwtService } = await import('@nestjs/jwt')
    const token = app.get(JwtService).sign({ userId: parallelId })
    const body = { answers: answersFor(11) }
    const [left, right] = await Promise.all([
      app.inject({ method: 'POST', url: '/api/gold-land/levels/13/complete', headers: { authorization: `Bearer ${token}` }, payload: body }),
      app.inject({ method: 'POST', url: '/api/gold-land/levels/13/complete', headers: { authorization: `Bearer ${token}` }, payload: body }),
    ])
    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 }; unlockedLevelId: number | null })
    assert.equal(bodies.reduce((sum, item) => sum + item.reward.coins, 0), 50 + 9)
    assert.equal(bodies.reduce((sum, item) => sum + item.reward.xp, 0), 100 + 15)
    assert.equal(bodies.every((item) => item.unlockedLevelId === null), true)
    console.log('castle-exam tests passed')
  } finally {
    await app.close()
    try { rmSync(testDir, { recursive: true, force: true }) } catch { /* ignore */ }
  }
}

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