import { NextRequest, NextResponse } from 'next/server'
import { authMiddleware } from '@/lib/auth-middleware'
import connectDB from '@/lib/mongodb'
import { User as UserModel } from '@/models/user'
import BillingService from '@/lib/billing-service'

// Define your VPN endpoints
const VPN_ENDPOINTS = {
  america: 'https://wireguard-vpn.3027622.siliconpin.com/vpn',
  europe: 'https://wireguard.vps20.siliconpin.com/vpn',
}

export async function POST(request: NextRequest) {
  try {
    // Check authentication
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Get data from request body
    const { orderId, location, plan, amount } = await request.json()

    if (!orderId) {
      return NextResponse.json({ error: 'Order ID is required' }, { status: 400 })
    }

    if (!location || !VPN_ENDPOINTS[location as keyof typeof VPN_ENDPOINTS]) {
      return NextResponse.json({ error: 'Valid VPN location is required' }, { status: 400 })
    }

    // Connect to MongoDB
    await connectDB()

    // Get user data for billing
    const userData = await UserModel.findOne({ email: user.email })
    if (!userData) {
      return NextResponse.json({ error: 'User not found' }, { status: 404 })
    }

    const requiredAmount = amount || 0

    // Check balance only if amount > 0
    if (requiredAmount > 0) {
      const currentBalance = userData.balance || 0
      if (currentBalance < requiredAmount) {
        return NextResponse.json(
          {
            error: `Insufficient balance. Required: ₹${requiredAmount}, Available: ₹${currentBalance}`,
            code: 'INSUFFICIENT_BALANCE',
          },
          { status: 400 }
        )
      }
    }

    // Get environment variables
    const VPN_API_KEY = process.env.VPN_API_KEY
    if (!VPN_API_KEY) {
      return NextResponse.json({ error: 'VPN API configuration missing' }, { status: 500 })
    }

    // Get the endpoint for the selected location
    const endpoint = VPN_ENDPOINTS[location as keyof typeof VPN_ENDPOINTS]

    // Make API request to the selected VPN endpoint
    const response = await fetch(endpoint, {
      method: 'POST',
      headers: {
        'X-API-Key': VPN_API_KEY,
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        new: orderId.toString(),
        userId: user.id,
        plan,
        location,
      }),
    })
    console.log('VPN_API_KEY', VPN_API_KEY)
    // Handle non-200 responses
    if (!response.ok) {
      const errorData = await response.text()
      throw new Error(`VPN API returned HTTP ${response.status}: ${errorData}`)
    }

    // Parse the response
    const vpnData = await response.json()
    const deploymentSuccess = response.ok && vpnData?.config

    if (!deploymentSuccess) {
      throw new Error('Invalid response from VPN API: Missing config')
    }

    // Process billing using the new comprehensive billing service
    try {
      const billingResult = await BillingService.processServiceDeployment({
        user: {
          id: user.id,
          email: user.email,
          siliconId: userData.siliconId,
        },
        service: {
          name: `VPN Service - ${location}`,
          type: 'vpn',
          id: orderId.toString(),
          config: {
            orderId,
            location,
            plan,
            endpoint: endpoint,
          },
        },
        amount: requiredAmount,
        currency: 'INR',
        cycle: 'monthly',
        deploymentSuccess,
        deploymentResponse: vpnData,
        metadata: {
          userAgent: request.headers.get('user-agent'),
          ip: request.headers.get('x-forwarded-for') || request.headers.get('x-real-ip'),
          vpnLocation: location,
          vpnPlan: plan,
        },
      })

      console.log('VPN billing processed:', {
        billingId: billingResult.billing.billing_id,
        transactionId: billingResult.transaction?.transactionId,
        balanceUpdated: billingResult.balanceUpdated,
      })
    } catch (billingError) {
      console.error('Billing processing failed:', billingError)
      // Continue even if billing fails, but return error if it's balance-related
      if (billingError instanceof Error && billingError.message.includes('Insufficient balance')) {
        return NextResponse.json(
          {
            error: billingError.message,
            code: 'INSUFFICIENT_BALANCE',
          },
          { status: 400 }
        )
      }
    }

    // Return the VPN configuration
    return NextResponse.json({
      success: true,
      data: vpnData,
    })
  } catch (error) {
    console.error('VPN deployment error:', error)
    return NextResponse.json(
      {
        error: 'VPN deployment failed',
        details: error instanceof Error ? error.message : 'Unknown error',
      },
      { status: 500 }
    )
  }
}