import { auth } from "@/lib/auth"
import { prisma } from "@/lib/prisma"
import { generateBackupCsv } from "@/lib/backup"
import { NextResponse } from "next/server"

export async function GET() {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
  }

  const userId = session.user.id

  try {
    const [drinks, ratings, wishlistItems, preferences, sharedLists, barItems] =
      await Promise.all([
        prisma.drink.findMany({
          where: { userId },
          orderBy: { createdAt: "asc" },
        }),
        prisma.rating.findMany({
          where: { userId },
          include: { drink: { select: { name: true } } },
          orderBy: { createdAt: "asc" },
        }),
        prisma.wishlistItem.findMany({
          where: { userId },
          orderBy: { createdAt: "asc" },
        }),
        prisma.userPreference.findUnique({ where: { userId } }),
        prisma.sharedList.findMany({
          where: { userId },
          orderBy: { createdAt: "asc" },
        }),
        prisma.barItem.findMany({
          where: { userId },
          orderBy: { createdAt: "asc" },
        }),
      ])

    const csv = generateBackupCsv(
      drinks,
      ratings,
      wishlistItems,
      preferences,
      sharedLists,
      barItems
    )

    const date = new Date().toISOString().split("T")[0]

    return new Response(csv, {
      headers: {
        "Content-Type": "text/csv; charset=utf-8",
        "Content-Disposition": `attachment; filename="drinktracker-backup-${date}.csv"`,
      },
    })
  } catch (error) {
    console.error("Backup export error:", error)
    return NextResponse.json(
      { error: "Failed to generate backup" },
      { status: 500 }
    )
  }
}