import { NextRequest, NextResponse } from 'next/server'
import { cookies } from 'next/headers'
import pool from '@/lib/db'

// POST /api/buyer-data/get-or-create - Get existing buyer_data or create new one
export async function POST(request: NextRequest) {
  try {
    const cookieStore = cookies()
    const buyerIdCookie = cookieStore.get('buyer_id')?.value

    if (!buyerIdCookie) {
      return NextResponse.json(
        { error: 'Authentication required' },
        { status: 401 }
      )
    }

    const buyer_id = parseInt(buyerIdCookie, 10)
    const body = await request.json()
    const { fullname, address, phone } = body

    // Validate required fields
    if (!fullname || !address || !phone) {
      return NextResponse.json(
        { error: 'Full name, address, and phone are required' },
        { status: 400 }
      )
    }

    // Validate phone format (basic validation - 10-15 digits)
    const phoneRegex = /^[+]?[\d\s\-()]{10,15}$/
    if (!phoneRegex.test(phone)) {
      return NextResponse.json(
        { error: 'Invalid phone number format' },
        { status: 400 }
      )
    }

    // Check if buyer_data with same values already exists for this buyer
    const [existingRows] = await pool.execute(
      'SELECT id FROM buyer_data WHERE buyer_id = ? AND fullname = ? AND address = ? AND phone = ?',
      [buyer_id, fullname.trim(), address.trim(), phone.trim()]
    )

    const existing = existingRows as any[]
    if (existing.length > 0) {
      // Return existing buyer_data_id
      return NextResponse.json({
        buyer_data_id: existing[0].id,
        created: false,
      })
    }

    // Create new buyer_data record
    const [result] = await pool.execute(
      'INSERT INTO buyer_data (buyer_id, fullname, address, phone) VALUES (?, ?, ?, ?)',
      [buyer_id, fullname.trim(), address.trim(), phone.trim()]
    )

    const buyer_data_id = (result as any).insertId

    return NextResponse.json({
      buyer_data_id,
      created: true,
    }, { status: 201 })
  } catch (error) {
    console.error('Error getting or creating buyer_data:', error)
    return NextResponse.json(
      { error: 'Failed to process buyer data' },
      { status: 500 }
    )
  }
}