import jwt from 'jsonwebtoken'
import PreRegistration from '../../models/preRegistration.js'
import Member from '../../models/member.js'
import { connectDB } from '../../utils/mongoose.js'
import { assignMemberNumber } from '../../utils/memberNumber.js'

export default defineEventHandler(async (event) => {
  const body = await validateBody(event, inviteAcceptSchema)
  const config = useRuntimeConfig(event)
  await connectDB()

  // Re-verify the token is still valid (not expired)
  let decoded
  try {
    decoded = jwt.verify(body.token, config.jwtSecret)
  } catch {
    throw createError({ statusCode: 401, statusMessage: 'Invalid or expired invitation link' })
  }

  if (decoded.type !== 'prereg-invite' || decoded.preRegistrationId !== body.preRegistrationId) {
    throw createError({ statusCode: 401, statusMessage: 'Invalid or expired invitation link' })
  }

  const preReg = await PreRegistration.findById(body.preRegistrationId)
  if (!preReg) {
    throw createError({ statusCode: 404, statusMessage: 'Pre-registration not found' })
  }

  if (preReg.status === 'accepted') {
    throw createError({ statusCode: 400, statusMessage: 'This invitation has already been accepted' })
  }

  // Check no existing member with this email
  const existingMember = await Member.findOne({ email: preReg.email })
  if (existingMember) {
    throw createError({ statusCode: 409, statusMessage: 'A member with this email already exists' })
  }

  // Create the member
  const member = await Member.create({
    email: preReg.email,
    name: body.name,
    pronouns: body.pronouns || undefined,
    location: body.location || undefined,
    circle: body.circle,
    contributionTier: body.contributionTier,
    bio: body.motivation || undefined,
    status: body.contributionTier === '0' ? 'active' : 'pending_payment',
  })

  await assignMemberNumber(member._id)

  // Update pre-registration
  await PreRegistration.findByIdAndUpdate(preReg._id, {
    $set: {
      status: 'accepted',
      acceptedAt: new Date(),
      memberId: member._id,
    }
  })

  logActivity(member._id, 'member_joined', {
    source: 'pre-registration',
    preRegistrationId: preReg._id,
  })

  // For free tier, issue session and redirect to welcome
  if (body.contributionTier === '0') {
    const sessionToken = jwt.sign(
      { memberId: member._id, email: member.email, tv: member.tokenVersion },
      config.jwtSecret,
      { expiresIn: '7d' },
    )

    setCookie(event, 'auth-token', sessionToken, {
      httpOnly: true,
      secure: process.env.NODE_ENV === 'production',
      sameSite: 'lax',
      path: '/',
      maxAge: 60 * 60 * 24 * 7,
    })

    return {
      success: true,
      requiresPayment: false,
      redirectUrl: '/member/dashboard',
      member: {
        id: member._id,
        email: member.email,
        name: member.name,
        circle: member.circle,
        contributionTier: member.contributionTier,
        status: member.status,
      }
    }
  }

  // For paid tiers, return member info so frontend can proceed to Helcim payment
  return {
    success: true,
    requiresPayment: true,
    member: {
      id: member._id,
      email: member.email,
      name: member.name,
      circle: member.circle,
      contributionTier: member.contributionTier,
      status: member.status,
    }
  }
})