/**
 * Jeu de données de démonstration : la classe Terminale S2 avec deux semaines
 * d'évaluations. Idempotent — relancer `npm run seed` ne duplique rien.
 * Usage : npm run seed [-- --reset]
 */
import { existsSync, rmSync } from 'node:fs'
import { resolve } from 'node:path'
import { db, nowIso } from './db.js'
import { newToken } from './auth.js'
import type { WeatherKind } from '@meteo-exam/shared'

const DB_PATH = process.env['METEO_DB'] ?? resolve(process.cwd(), 'data/meteo-exam.db')

if (process.argv.includes('--reset')) {
  for (const suffix of ['', '-wal', '-shm']) {
    const file = `${DB_PATH}${suffix}`
    if (existsSync(file)) rmSync(file)
  }
  console.log('Base effacée. Relancez `npm run seed`.')
  process.exit(0)
}

const existing = db.prepare<[], { n: number }>('SELECT COUNT(*) AS n FROM classes').get()!
if (existing.n > 0) {
  console.log('La base contient déjà des classes — seed ignoré. Utilisez --reset pour repartir de zéro.')
  process.exit(0)
}

const CLASS_NAME = 'Terminale S2'
const LEVEL = 'Lycée'
const ADMIN_NICK = 'Thomas S.'
const CLASS_CODE = 'TERMS2'

const DAY_MS = 86_400_000
const isWeekend = (d: Date): boolean => d.getDay() === 0 || d.getDay() === 6

const midnight = new Date()
midnight.setHours(0, 0, 0, 0)

/**
 * `dayOffset` compte les jours **scolaires** : 0 = aujourd'hui (même si c'est
 * samedi, le seed reste lisible), puis on saute les weekends.
 */
function schoolDay(offset: number): Date {
  const date = new Date(midnight)
  let counted = 0
  for (let step = 0; step < 90; step++) {
    if (counted === offset) break
    date.setTime(date.getTime() + DAY_MS)
    if (!isWeekend(date)) counted++
  }
  return date
}

interface SeedExam {
  dayOffset: number
  hour: number
  subject: string
  teacher: string | null
  room: string | null
  chapter: string | null
  durationMin: number
  weight: number
  kind: WeatherKind
  note: string | null
}

const exams: SeedExam[] = [
  { dayOffset: 0, hour: 8, subject: 'Mathématiques', teacher: 'M. Roussel', room: 'B204', chapter: 'Intégrales, primitives et dérivation', durationMin: 120, weight: 4, kind: 'tempete', note: 'Calculatrice autorisée, calculatrice graphique non.' },
  { dayOffset: 0, hour: 14, subject: 'Histoire-Géographie', teacher: 'Mme Ferrand', room: 'A112', chapter: null, durationMin: 55, weight: 1, kind: 'vent', note: 'Interro surprise probable en début de cours.' },
  { dayOffset: 1, hour: 9, subject: 'Physique-Chimie', teacher: 'Mme Nguyen', room: 'Labo 3', chapter: 'Mécanique : second principe', durationMin: 60, weight: 2, kind: 'orage', note: 'Paquet de calculatrices fourni.' },
  { dayOffset: 1, hour: 15, subject: 'Anglais', teacher: 'M. Whitfield', room: 'C007', chapter: 'Compréhension orale — Unit 4', durationMin: 30, weight: 1, kind: 'vent', note: 'Rumeur d’une dictée surprise.' },
  { dayOffset: 2, hour: 8, subject: 'SVT', teacher: 'Mme Perrin', room: 'S215', chapter: 'Génétique des populations', durationMin: 90, weight: 3, kind: 'orage', note: 'TP suivi d’une synthèse écrite.' },
  { dayOffset: 3, hour: 10, subject: 'Philosophie', teacher: 'M. Aubert', room: 'A008', chapter: 'La raison et le doute', durationMin: 120, weight: 3, kind: 'orage', note: 'Dissertation, sujet au choix.' },
  { dayOffset: 3, hour: 16, subject: 'EPS', teacher: 'Mme Costa', room: 'Gymnase', chapter: null, durationMin: 60, weight: 1, kind: 'soleil', note: 'Basket obligatoire.' },
  { dayOffset: 4, hour: 9, subject: 'Mathématiques', teacher: 'M. Roussel', room: 'B204', chapter: 'Probabilités conditionnelles', durationMin: 60, weight: 2, kind: 'orage', note: null },
  { dayOffset: 5, hour: 10, subject: 'Français', teacher: 'Mme Dumas', room: 'A101', chapter: 'Guerre froide — contexte', durationMin: 60, weight: 1, kind: 'vent', note: 'Lecture suivie d’une étude de texte.' },
  { dayOffset: 6, hour: 8, subject: 'Examen blanc', teacher: null, room: 'Amphi A', chapter: 'Toutes matières', durationMin: 180, weight: 5, kind: 'tempete', note: 'Blanc général, convocation à 8h précises.' },
  { dayOffset: 7, hour: 9, subject: 'SVT', teacher: 'Mme Perrin', room: 'S215', chapter: 'Écosystèmes et bilan de matière', durationMin: 45, weight: 1, kind: 'brouillard', note: 'Brouillard : TP évalué, date encore floue.' },
  { dayOffset: 8, hour: 14, subject: 'Anglais', teacher: 'M. Whitfield', room: 'C007', chapter: 'Expression écrite — sujet d’invention', durationMin: 60, weight: 2, kind: 'orage', note: null },
  { dayOffset: 9, hour: 8, subject: 'Histoire-Géographie', teacher: 'Mme Ferrand', room: 'A112', chapter: 'La décolonisation', durationMin: 60, weight: 2, kind: 'orage', note: null },
  { dayOffset: 10, hour: 10, subject: 'Philosophie', teacher: 'M. Aubert', room: 'A008', chapter: 'Le sujet et l’autre', durationMin: 60, weight: 2, kind: 'orage', note: 'Plan imposé.' },
]

const seed = db.transaction(() => {
  db.prepare('INSERT INTO classes (name, level, code, flash_message, created_at) VALUES (?, ?, ?, ?, ?)')
    .run(CLASS_NAME, LEVEL, CLASS_CODE, 'Bon courage pour les révisions cette semaine ! 🌤️', nowIso())

  const classId = db.prepare<[string], { id: number }>('SELECT id FROM classes WHERE code = ?')
    .get(CLASS_CODE)!.id

  const adminToken = newToken()
  const adminId = db
    .prepare('INSERT INTO members (class_id, nickname, role, token, created_at) VALUES (?, ?, ?, ?, ?)')
    .run(classId, ADMIN_NICK, 'admin', adminToken, nowIso()).lastInsertRowid as number

  // Quelques élèves : ils donneront du volume aux votes du radar plus tard.
  for (const nick of ['Léa M.', 'Karim B.', 'Chloé D.', 'Inès R.', 'Lucas P.', 'Mehdi A.']) {
    db.prepare('INSERT INTO members (class_id, nickname, role, token, created_at) VALUES (?, ?, ?, ?, ?)')
      .run(classId, nick, 'student', newToken(), nowIso())
  }

  const insert = db.prepare(
    `INSERT INTO exams
       (class_id, subject, teacher, room, chapter, starts_at, duration_min, weight, kind, note, created_by, created_at, updated_at)
     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
  )

  for (const e of exams) {
    const date = schoolDay(e.dayOffset)
    date.setHours(e.hour, 0, 0, 0)
    const now = nowIso()
    insert.run(
      classId, e.subject, e.teacher, e.room, e.chapter,
      date.toISOString(), e.durationMin, e.weight, e.kind, e.note,
      adminId, now, now,
    )
  }

  return { classId, adminToken }
})

const { adminToken } = seed()

console.log('Seed terminé.')
console.log(`  Classe      : ${CLASS_NAME} (${LEVEL})`)
console.log(`  Code invite : ${CLASS_CODE}`)
console.log(`  Admin       : ${ADMIN_NICK}`)
console.log(`  Évaluations : ${exams.length}`)
console.log(`  Jeton admin : ${adminToken}`)