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'
import { checkServiceAvailability } from '@/lib/system-settings'

// VPC subnet mapping based on datacenter
const VPC_SUBNET_MAP: { [key: string]: string } = {
  inmumbaizone2: '3889f7ca-ca19-4851-abc7-5c6b4798b3fe', // Mumbai public subnet
  inbangalore: 'c17032c9-3cfd-4028-8f2a-f3f5aa8c2976', // Bangalore public subnet
  innoida: '95c60b59-4925-4b7e-bd05-afbf940d8000', // Delhi/Noida public subnet
  defra1: '72ea201d-e1e7-4d30-a186-bc709efafad8', // Frankfurt public subnet
  uslosangeles: '0e253cd1-8ecc-4b65-ae0f-6acbc53b0fb6', // Los Angeles public subnet
  inbangalore3: 'f687a58b-04f0-4ebe-b583-65788a1d18bf', // Bangalore DC3 public subnet
}

export async function POST(request: NextRequest) {
  try {
    // Check if VPS deployment service is enabled
    if (!(await checkServiceAvailability('vps'))) {
      return NextResponse.json(
        {
          status: 'error',
          message: 'VPS deployment service is currently disabled by administrator',
        },
        { status: 503 }
      )
    }

    // Check authentication using your auth middleware
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json(
        { status: 'error', message: 'Unauthorized: Please login to continue' },
        { status: 401 }
      )
    }

    // Get input data from request
    const input = await request.json()
    if (!input) {
      return NextResponse.json({ status: 'error', message: 'Invalid JSON' }, { status: 400 })
    }

    // Get API key from environment
    const UTHO_API_KEY = process.env.UTHO_API_KEY
    if (!UTHO_API_KEY) {
      return NextResponse.json(
        { status: 'error', message: 'API configuration missing' },
        { status: 500 }
      )
    }

    // Connect to MongoDB
    await connectDB()

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

    const requiredAmount = input.amount || 0

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

    // Get VPC subnet based on datacenter
    const vpcSubnet = VPC_SUBNET_MAP[input.dclocation] || VPC_SUBNET_MAP['inbangalore']

    // Prepare Utho payload - use the exact format from your PHP code
    const uthoPayload = {
      dcslug: input.dclocation,
      planid: input.planid,
      billingcycle: 'hourly',
      auth: 'option2',
      enable_publicip: input.publicip !== false,
      subnetRequired: false,
      firewall: '23434645',
      cpumodel: 'intel',
      enablebackup: input.backup || false,
      root_password: input.password,
      support: 'unmanaged',
      vpc: vpcSubnet,
      cloud: [
        {
          hostname: input.hostname,
        },
      ],
      image: input.image,
      sshkeys: '',
    }

    console.log('Sending to Utho API:', uthoPayload)

    // Make API request to Utho
    const UTHO_API_URL = 'https://api.utho.com/v2/cloud/deploy'
    const response = await fetch(UTHO_API_URL, {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${UTHO_API_KEY}`,
        'Content-Type': 'application/json',
        Accept: '*/*',
      },
      body: JSON.stringify(uthoPayload),
    })

    const httpCode = response.status
    const deploymentSuccess = httpCode >= 200 && httpCode < 300
    const responseData = await response.json()

    // Add status field like PHP does
    responseData.status = deploymentSuccess ? 'success' : 'error'

    console.log('Utho API response:', { httpCode, responseData })

    // 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: 'VPS Server',
          type: 'vps',
          id: responseData.server_id || responseData.id,
          instanceId: responseData.server_id || responseData.id,
          config: {
            hostname: input.hostname,
            planid: input.planid,
            dclocation: input.dclocation,
            image: input.image,
            backup: input.backup,
            publicip: input.publicip,
          },
        },
        amount: requiredAmount,
        currency: 'INR',
        cycle: (input.cycle as any) || 'onetime',
        deploymentSuccess,
        deploymentResponse: responseData,
        metadata: {
          userAgent: request.headers.get('user-agent'),
          ip: request.headers.get('x-forwarded-for') || request.headers.get('x-real-ip'),
          uthoPayload,
          httpCode,
        },
      })

      console.log('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(
          {
            status: 'error',
            message: billingError.message,
            code: 'INSUFFICIENT_BALANCE',
          },
          { status: 400 }
        )
      }
    }

    // Return the exact same response format as PHP
    return NextResponse.json(responseData, { status: httpCode })
  } catch (error) {
    console.error('Cloud deployment error:', error)
    return NextResponse.json(
      {
        status: 'error',
        message: 'Internal server error',
        details: error instanceof Error ? error.message : 'Unknown error',
      },
      { status: 500 }
    )
  }
}