const fs = require('fs')
const path = require('path')

const {
  ensureData,
  findUserByEmail,
  createUser,
  findGameById,
  createGame,
  updateGameThumbnail,
  createGameItem,
  createCustomItem,
  findTierListById,
  saveTierList,
  createGameSuggestion,
} = require('../src/db')

async function run() {
  const sourcePath = path.join(__dirname, '..', 'data', 'db.json')
  const raw = fs.readFileSync(sourcePath, 'utf8')
  const data = JSON.parse(raw)

  await ensureData()

  for (const user of data.users || []) {
    const existing = await findUserByEmail(user.email)
    if (!existing) {
      await createUser({
        id: user.id,
        email: user.email,
        nickname: user.nickname || '',
        passwordHash: user.passwordHash,
        isAdmin: !!user.isAdmin,
      })
    }
  }

  for (const game of data.games || []) {
    const existing = await findGameById(game.id)
    if (!existing) {
      await createGame({ id: game.id, name: game.name })
    }
    if (game.thumbnailSrc) {
      await updateGameThumbnail(game.id, game.thumbnailSrc)
    }
  }

  for (const item of data.gameImages || []) {
    try {
      await createGameItem({
        id: item.id,
        gameId: item.gameId,
        src: item.src,
        label: item.label,
      })
    } catch (e) {}
  }

  for (const suggestion of data.gameSuggestions || []) {
    try {
      await createGameSuggestion({ id: suggestion.id, name: suggestion.name })
    } catch (e) {}
  }

  const seenCustomIds = new Set()
  for (const tierList of data.tierLists || []) {
    for (const item of tierList.pool || []) {
      if (item.origin !== 'custom' || seenCustomIds.has(item.id)) continue
      seenCustomIds.add(item.id)
      try {
        await createCustomItem({
          id: item.id,
          ownerId: tierList.authorId,
          src: item.src,
          label: item.label,
        })
      } catch (e) {}
    }
  }

  for (const tierList of data.tierLists || []) {
    const existing = await findTierListById(tierList.id)
    if (!existing) {
      await saveTierList({
        id: tierList.id,
        authorId: tierList.authorId,
        gameId: tierList.gameId,
        title: tierList.title,
        description: tierList.description || '',
        isPublic: !!tierList.isPublic,
        groups: tierList.groups || [],
        pool: tierList.pool || [],
      })
    }
  }

  console.log('migrate-lowdb-to-mariadb: done')
}

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