import { requireAuth } from '~/server/utils/auth'
import { prisma } from '~/server/utils/prisma'

export default defineEventHandler(async (event) => {
  const currentUser = requireAuth(event)
  const targetIdOrUsername = getRouterParam(event, 'id')

  const targetUser = await prisma.user.findFirst({
    where: {
      OR: [
        { id: targetIdOrUsername },
        { username: targetIdOrUsername }
      ]
    }
  })

  if (!targetUser) {
    throw createError({ statusCode: 404, message: 'User not found' })
  }

  if (targetUser.id === currentUser.id) {
    throw createError({ statusCode: 400, message: 'You cannot follow yourself' })
  }

  await prisma.follows.upsert({
    where: {
      followerId_followingId: {
        followerId: currentUser.id,
        followingId: targetUser.id
      }
    },
    update: {},
    create: {
      followerId: currentUser.id,
      followingId: targetUser.id
    }
  })

  return { success: true }
})