import { NextRequest, NextResponse } from 'next/server'
import { createClient } from '@supabase/supabase-js'

// Create server-side Supabase client with user session
function createServerSupabaseClient(request: Request) {
  const authHeader = request.headers.get('authorization')
  
  return createClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      auth: {
        autoRefreshToken: false,
        persistSession: false
      },
      global: {
        headers: authHeader ? {
          Authorization: authHeader
        } : {}
      }
    }
  )
}

export async function GET(req: NextRequest) {
  try {
    const supabase = createServerSupabaseClient(req)
    
    // Get current user
    const { data: { user }, error: authError } = await supabase.auth.getUser()
    if (authError || !user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { searchParams } = new URL(req.url)
    const bookId = searchParams.get('bookId')
    const limit = parseInt(searchParams.get('limit') || '20')
    const offset = parseInt(searchParams.get('offset') || '0')

    // Build query
    let query = supabase
      .from('generated_images')
      .select('*')
      .eq('user_id', user.id)
      .order('created_at', { ascending: false })
      .range(offset, offset + limit - 1)

    // Filter by book if specified
    if (bookId) {
      query = query.eq('book_id', bookId)
    }

    const { data: images, error } = await query

    if (error) {
      return NextResponse.json({ error: 'Failed to fetch images' }, { status: 500 })
    }

    return NextResponse.json({
      images: images || [],
      pagination: {
        limit,
        offset,
        hasMore: images?.length === limit
      }
    })

  } catch (error) {
    return NextResponse.json({ error: 'Failed to fetch images' }, { status: 500 })
  }
}

// DELETE endpoint to remove generated images
export async function DELETE(req: NextRequest) {
  try {
    const supabase = createServerSupabaseClient(req)
    
    // Get current user
    const { data: { user }, error: authError } = await supabase.auth.getUser()
    if (authError || !user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { imageId } = await req.json()

    if (!imageId) {
      return NextResponse.json({ error: 'Image ID is required' }, { status: 400 })
    }

    // Delete the image (RLS will ensure user can only delete their own images)
    const { error } = await supabase
      .from('generated_images')
      .delete()
      .eq('id', imageId)
      .eq('user_id', user.id)

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

    return NextResponse.json({ success: true })
  } catch (error) {
    return NextResponse.json({ error: 'Failed to delete image' }, { status: 500 })
  }
}