import { NextResponse } from "next/server"
import { prisma } from "@/lib/prisma"
import type { Category } from "@/lib/types"

export async function POST(request: Request) {
  try {
    const category: Omit<Category, "id"> = await request.json()

    const created = await prisma.category.create({
      data: {
        name: category.name,
        color: category.color,
        icon: category.icon,
        keywords: JSON.stringify(category.keywords),
        parentId: category.parentId,
      },
    })

    return NextResponse.json({
      ...created,
      keywords: JSON.parse(created.keywords),
    })
  } catch (error) {
    console.error("Error creating category:", error)
    return NextResponse.json({ error: "Failed to create category" }, { status: 500 })
  }
}

export async function PUT(request: Request) {
  try {
    const category: Category = await request.json()

    const updated = await prisma.category.update({
      where: { id: category.id },
      data: {
        name: category.name,
        color: category.color,
        icon: category.icon,
        keywords: JSON.stringify(category.keywords),
        parentId: category.parentId,
      },
    })

    return NextResponse.json({
      ...updated,
      keywords: JSON.parse(updated.keywords),
    })
  } catch (error) {
    console.error("Error updating category:", error)
    return NextResponse.json({ error: "Failed to update category" }, { status: 500 })
  }
}

export async function DELETE(request: Request) {
  try {
    const { searchParams } = new URL(request.url)
    const id = searchParams.get("id")

    if (!id) {
      return NextResponse.json({ error: "Category ID is required" }, { status: 400 })
    }

    // Remove category from transactions (set to null)
    await prisma.transaction.updateMany({
      where: { categoryId: id },
      data: { categoryId: null },
    })

    await prisma.category.delete({
      where: { id },
    })

    return NextResponse.json({ success: true })
  } catch (error) {
    console.error("Error deleting category:", error)
    return NextResponse.json({ error: "Failed to delete category" }, { status: 500 })
  }
}