import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'
import { verifyJWT } from '@/lib/auth'

export async function POST(req: NextRequest) {
  try {
    const auth = req.headers.get('authorization')
    if (!auth?.startsWith('Bearer ')) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }
    
    const payload = await verifyJWT(auth.slice(7))
    if (!payload) {
      return NextResponse.json({ error: 'Invalid token' }, { status: 401 })
    }

    const { projectId, amountFlh } = await req.json()
    if (!projectId || !amountFlh || amountFlh <= 0) {
      return NextResponse.json({ error: 'Invalid project or amount' }, { status: 400 })
    }

    const user = await prisma.user.findUnique({ where: { id: payload.id } })
    if (!user) {
      return NextResponse.json({ error: 'User not found' }, { status: 404 })
    }

    if (user.flhBalance < amountFlh) {
      return NextResponse.json({ error: 'Insufficient FLH balance' }, { status: 400 })
    }

    // Decrement the user's balance
    const updatedUser = await prisma.user.update({
      where: { id: payload.id },
      data: { flhBalance: { decrement: amountFlh } },
    })

    return NextResponse.json({
      success: true,
      newBalance: updatedUser.flhBalance,
      message: `Successfully contributed ${amountFlh} FLH to the project.`
    })
  } catch (e) {
    console.error(e)
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}