import { NextRequest, NextResponse } from 'next/server'
import { createServerSupabaseClient } from '@/lib/supabase'

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

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

    if (!userId) {
      return NextResponse.json({ error: 'User ID required' }, { status: 400 })
    }

    // Validate file type
    if (!file.type.startsWith('image/')) {
      return NextResponse.json({ error: 'File must be an image' }, { status: 400 })
    }

    // Validate file size (max 5MB)
    if (file.size > 5 * 1024 * 1024) {
      return NextResponse.json({ error: 'File size must be less than 5MB' }, { status: 400 })
    }

    const supabase = createServerSupabaseClient()

    // Generate unique filename
    const fileExt = file.name.split('.').pop()
    const fileName = `${userId}/${Date.now()}-${Math.random().toString(36).substring(2)}.${fileExt}`
    const filePath = `book-covers/${fileName}`

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

    // Upload to Supabase Storage
    const { data, error } = await supabase.storage
      .from('book-covers')
      .upload(filePath, buffer, {
        contentType: file.type,
        cacheControl: '3600',
        upsert: false
      })

    if (error) {
      console.error('Storage upload error:', error)
      return NextResponse.json({ error: 'Failed to upload image' }, { status: 500 })
    }

    // Get public URL
    const { data: { publicUrl } } = supabase.storage
      .from('book-covers')
      .getPublicUrl(data.path)

    return NextResponse.json({ 
      success: true, 
      imageUrl: publicUrl,
      path: data.path
    })

  } catch (error) {
    console.error('Upload API error:', error)
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}