import { NextResponse } from 'next/server'
import { z } from 'zod'
import { stripe } from '@/lib/stripe-server'
import { prisma } from '@/lib/db'
import { verifyToken } from '@/lib/auth'

export const runtime = 'nodejs'

const portalSchema = z.object({
  locale: z.string().default('en')
})

export async function POST(request: Request) {
  try {
    // Verify authentication
    const authHeader = request.headers.get('authorization')
    if (!authHeader?.startsWith('Bearer ')) {
      return NextResponse.json(
        { success: false, error: 'Authentication required' },
        { status: 401 }
      )
    }

    const token = authHeader.substring(7)
    let payload
    try {
      payload = await verifyToken(token)
    } catch (error) {
      return NextResponse.json(
        { success: false, error: 'Invalid or expired token' },
        { status: 401 }
      )
    }

    const userId = payload.userId

    // Get user
    const user = await prisma.user.findUnique({
      where: { id: userId },
      select: {
        stripeCustomerId: true,
        subscriptionTier: true
      }
    })

    if (!user) {
      return NextResponse.json(
        { success: false, error: 'User not found' },
        { status: 404 }
      )
    }

    if (!user.stripeCustomerId) {
      return NextResponse.json(
        {
          success: false,
          error: 'No subscription found',
          code: 'NO_SUBSCRIPTION'
        },
        { status: 404 }
      )
    }

    const body = await request.json()
    const { locale } = portalSchema.parse(body)

    // Create billing portal session
    const session = await stripe.billingPortal.sessions.create({
      customer: user.stripeCustomerId,
      return_url: `${process.env.NEXTAUTH_URL}/${locale}/settings`
    })

    console.log('✅ Customer portal session created:', {
      sessionId: session.id,
      userId,
      customerId: user.stripeCustomerId
    })

    return NextResponse.json({
      success: true,
      url: session.url
    })

  } catch (error) {
    console.error('Customer portal error:', error)

    if (error instanceof z.ZodError) {
      return NextResponse.json(
        {
          success: false,
          error: 'Invalid request format',
          details: error.errors
        },
        { status: 400 }
      )
    }

    return NextResponse.json(
      {
        success: false,
        error: 'Failed to create portal session'
      },
      { status: 500 }
    )
  }
}