'use server'

import { revalidatePath } from 'next/cache'
import prisma from '@/lib/prisma'
import { auth } from '@/auth'

export async function createBrainstormShare(
  sessionId: string,
  recipientEmail: string,
  permission: 'editor' | 'viewer' = 'editor'
) {
  const session = await auth()
  if (!session?.user?.id) throw new Error('Unauthorized')

  const brainstorm = await prisma.brainstormSession.findUnique({
    where: { id: sessionId },
  })
  if (!brainstorm) throw new Error('Session not found')
  if (brainstorm.userId !== session.user.id)
    throw new Error('Only the owner can share')

  const recipient = await prisma.user.findUnique({
    where: { email: recipientEmail },
  })
  if (!recipient) throw new Error('No account found with this email')
  if (recipient.id === session.user.id)
    throw new Error('Cannot share with yourself')

  const existing = await prisma.brainstormShare.findUnique({
    where: { sessionId_userId: { sessionId, userId: recipient.id } },
  })

  if (existing) {
    switch (existing.status) {
      case 'accepted':
        return { success: true, message: 'already_shared' }
      case 'pending':
        return { success: true, message: 'already_pending' }
      case 'declined':
      case 'removed':
        await prisma.brainstormShare.update({
          where: { id: existing.id },
          data: {
            status: 'pending',
            permission,
            notifiedAt: new Date(),
            respondedAt: null,
          },
        })
        return { success: true, message: 're_invited' }
    }
  }

  await prisma.brainstormShare.create({
    data: {
      sessionId,
      userId: recipient.id,
      sharedBy: session.user.id,
      status: 'pending',
      permission,
      notifiedAt: new Date(),
    },
  })

  return { success: true, message: 'invited' }
}

export async function getPendingBrainstormShares() {
  const session = await auth()
  if (!session?.user?.id) return []

  try {
    return await prisma.brainstormShare.findMany({
      where: { userId: session.user.id, status: 'pending' },
      include: {
        session: {
          select: { id: true, seedIdea: true, createdAt: true },
        },
        sharer: {
          select: { id: true, name: true, email: true, image: true },
        },
      },
      orderBy: { createdAt: 'desc' },
    })
  } catch {
    return []
  }
}

export async function respondToBrainstormShare(
  shareId: string,
  action: 'accept' | 'decline'
) {
  const session = await auth()
  if (!session?.user?.id) throw new Error('Unauthorized')

  const share = await prisma.brainstormShare.findUnique({
    where: { id: shareId },
  })
  if (!share) throw new Error('Share not found')
  if (share.userId !== session.user.id) throw new Error('Unauthorized')
  if (share.status !== 'pending')
    throw new Error(`Share already ${share.status}`)

  const newStatus = action === 'accept' ? 'accepted' : 'declined'

  await prisma.brainstormShare.update({
    where: { id: shareId },
    data: { status: newStatus, respondedAt: new Date() },
  })

  if (action === 'accept') {
    await prisma.brainstormParticipant.upsert({
      where: {
        sessionId_userId: {
          sessionId: share.sessionId,
          userId: session.user.id,
        },
      },
      create: {
        sessionId: share.sessionId,
        userId: session.user.id,
        role: share.permission === 'viewer' ? 'viewer' : 'editor',
      },
      update: {
        role: share.permission === 'viewer' ? 'viewer' : 'editor',
      },
    })
  }

  revalidatePath('/home')
  return { success: true }
}

export async function ensureAcceptedSharesHaveParticipants() {
  const session = await auth()
  if (!session?.user?.id) return

  const acceptedShares = await prisma.brainstormShare.findMany({
    where: { userId: session.user.id, status: 'accepted' },
    select: { sessionId: true, permission: true },
  })

  for (const share of acceptedShares) {
    await prisma.brainstormParticipant.upsert({
      where: {
        sessionId_userId: {
          sessionId: share.sessionId,
          userId: session.user.id,
        },
      },
      create: {
        sessionId: share.sessionId,
        userId: session.user.id,
        role: share.permission === 'viewer' ? 'viewer' : 'editor',
      },
      update: {},
    })
  }
}

export async function getAcceptedBrainstormShares() {
  const session = await auth()
  if (!session?.user?.id) return []

  try {
    return await prisma.brainstormShare.findMany({
      where: { userId: session.user.id, status: 'accepted' },
      include: {
        session: {
          select: {
            id: true,
            seedIdea: true,
            createdAt: true,
            updatedAt: true,
            ideas: { where: { status: 'active' }, select: { id: true } },
          },
        },
      },
      orderBy: { session: { updatedAt: 'desc' } },
    })
  } catch {
    return []
  }
}

export async function removeBrainstormShare(sessionId: string) {
  const session = await auth()
  if (!session?.user?.id) throw new Error('Unauthorized')

  await prisma.brainstormShare.updateMany({
    where: { sessionId, userId: session.user.id, status: 'accepted' },
    data: { status: 'removed' },
  })

  revalidatePath('/home')
  return { success: true }
}