import { NextRequest, NextResponse } from 'next/server'
import { withAdminAuth } from '@/lib/admin-middleware'
import { connectDB } from '@/lib/mongodb'
import { Billing } from '@/models/billing'
import { DeveloperRequest } from '@/models/developer-request'

export async function GET(request: NextRequest) {
  return withAdminAuth(request, async (req, admin) => {
    try {
      await connectDB()

      const { searchParams } = new URL(request.url)
      const page = parseInt(searchParams.get('page') || '1')
      const limit = parseInt(searchParams.get('limit') || '20')
      const serviceType = searchParams.get('serviceType') || ''
      const status = searchParams.get('status') || ''
      const dateFrom = searchParams.get('dateFrom')
      const dateTo = searchParams.get('dateTo')

      const skip = (page - 1) * limit

      // Build filter query for billing services
      const billingFilter: any = {}

      if (serviceType && serviceType !== 'all') {
        billingFilter.service_type = serviceType
      }

      if (status && status !== 'all') {
        billingFilter.service_status = status
      }

      if (dateFrom || dateTo) {
        billingFilter.created_at = {}
        if (dateFrom) billingFilter.created_at.$gte = new Date(dateFrom)
        if (dateTo) billingFilter.created_at.$lte = new Date(dateTo)
      }

      // Fetch billing services
      const [billingServices, totalBillingServices] = await Promise.all([
        Billing.find(billingFilter).sort({ created_at: -1 }).skip(skip).limit(limit),
        Billing.countDocuments(billingFilter),
      ])

      // Build filter for developer requests
      const devRequestFilter: any = {}

      if (status && status !== 'all') {
        devRequestFilter.status = status
      }

      if (dateFrom || dateTo) {
        devRequestFilter.createdAt = {}
        if (dateFrom) devRequestFilter.createdAt.$gte = new Date(dateFrom)
        if (dateTo) devRequestFilter.createdAt.$lte = new Date(dateTo)
      }

      // Fetch developer requests
      const [developerRequests, totalDeveloperRequests] = await Promise.all([
        (DeveloperRequest as any)
          .find(devRequestFilter)
          .populate('userId', 'name email siliconId')
          .sort({ createdAt: -1 })
          .skip(skip)
          .limit(limit),
        (DeveloperRequest as any).countDocuments(devRequestFilter),
      ])

      // Service statistics
      const serviceStats = await Billing.aggregate([
        {
          $group: {
            _id: '$service_type',
            count: { $sum: 1 },
            revenue: { $sum: '$amount' },
            activeServices: {
              $sum: { $cond: [{ $eq: ['$service_status', 'active'] }, 1, 0] },
            },
          },
        },
        { $sort: { count: -1 } },
      ])

      // Status breakdown
      const statusBreakdown = await Billing.aggregate([
        {
          $group: {
            _id: '$service_status',
            count: { $sum: 1 },
          },
        },
      ])

      const totalPages = Math.ceil(Math.max(totalBillingServices, totalDeveloperRequests) / limit)

      return NextResponse.json({
        billingServices,
        developerRequests,
        serviceStats,
        statusBreakdown,
        pagination: {
          currentPage: page,
          totalPages,
          totalBillingServices,
          totalDeveloperRequests,
          hasNext: page < totalPages,
          hasPrev: page > 1,
        },
      })
    } catch (error) {
      console.error('Admin services fetch error:', error)
      return NextResponse.json({ error: 'Failed to fetch services data' }, { status: 500 })
    }
  })
}

export async function POST(request: NextRequest) {
  return withAdminAuth(request, async (req, admin) => {
    try {
      await connectDB()

      const body = await request.json()
      const { action, serviceId, serviceType, data } = body

      if (action === 'updateBilling') {
        const billing = await Billing.findByIdAndUpdate(
          serviceId,
          {
            service_status: data.service_status,
            updated_at: new Date(),
          },
          { new: true }
        )

        if (!billing) {
          return NextResponse.json({ error: 'Service not found' }, { status: 404 })
        }

        return NextResponse.json({ service: billing })
      }

      if (action === 'updateDeveloperRequest') {
        const developerRequest = await (DeveloperRequest as any)
          .findByIdAndUpdate(
            serviceId,
            {
              status: data.status,
              assignedDeveloper: data.assignedDeveloper,
              estimatedCompletionDate: data.estimatedCompletionDate,
              notes: data.notes,
              updatedAt: new Date(),
            },
            { new: true }
          )
          .populate('userId', 'name email siliconId')

        if (!developerRequest) {
          return NextResponse.json({ error: 'Developer request not found' }, { status: 404 })
        }

        return NextResponse.json({ service: developerRequest })
      }

      if (action === 'cancelService') {
        if (serviceType === 'billing') {
          const billing = await Billing.findByIdAndUpdate(
            serviceId,
            {
              service_status: 'cancelled',
              updated_at: new Date(),
            },
            { new: true }
          )

          return NextResponse.json({ service: billing })
        }

        if (serviceType === 'developer') {
          const updatedDeveloperRequest = await (DeveloperRequest as any)
            .findByIdAndUpdate(
              serviceId,
              {
                status: 'cancelled',
                updatedAt: new Date(),
              },
              { new: true }
            )
            .populate('userId', 'name email siliconId')

          return NextResponse.json({ service: updatedDeveloperRequest })
        }
      }

      return NextResponse.json({ error: 'Invalid action or service type' }, { status: 400 })
    } catch (error) {
      console.error('Admin service action error:', error)
      return NextResponse.json({ error: 'Failed to perform service action' }, { status: 500 })
    }
  })
}