import { NextRequest, NextResponse } from 'next/server'
import { writeFile, mkdir } from 'fs/promises'
import { join } from 'path'
import { existsSync } from 'fs'

export async function POST(request: NextRequest) {
  try {
    const formData = await request.formData()
    const file = formData.get('file') as File

    if (!file) {
      return NextResponse.json(
        { error: 'No file uploaded' },
        { status: 400 }
      )
    }

    // Validate file type
    const validTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/webp']
    if (!validTypes.includes(file.type)) {
      return NextResponse.json(
        { error: 'Invalid file type. Only JPEG, PNG, and WebP are allowed.' },
        { status: 400 }
      )
    }

    // Validate file size (max 5MB)
    const maxSize = 5 * 1024 * 1024 // 5MB
    if (file.size > maxSize) {
      return NextResponse.json(
        { error: 'File size too large. Maximum size is 5MB.' },
        { status: 400 }
      )
    }

    const bytes = await file.arrayBuffer()
    const buffer = Buffer.from(bytes)

    // Create uploads directory if it doesn't exist
    const uploadsDir = join(process.cwd(), 'public', 'uploads')
    if (!existsSync(uploadsDir)) {
      await mkdir(uploadsDir, { recursive: true })
    }

    // Generate unique filename
    const timestamp = Date.now()
    const originalName = file.name.replace(/[^a-zA-Z0-9.-]/g, '_')
    const filename = `${timestamp}-${originalName}`
    const filepath = join(uploadsDir, filename)

    // Write file
    await writeFile(filepath, buffer)

    // Return the public URL
    const fileUrl = `/uploads/${filename}`

    return NextResponse.json({ url: fileUrl }, { status: 200 })
  } catch (error) {
    console.error('Error uploading file:', error)
    return NextResponse.json(
      { error: 'Failed to upload file' },
      { status: 500 }
    )
  }
}