import { prisma } from "@/lib/prisma";
import type { Category } from "@/lib/types";

export const categoryService = {
  async create(data: Omit<Category, "id">): Promise<Category> {
    const created = await prisma.category.create({
      data: {
        name: data.name,
        color: data.color,
        icon: data.icon,
        keywords: JSON.stringify(data.keywords),
        parentId: data.parentId,
      },
    });

    return {
      id: created.id,
      name: created.name,
      color: created.color,
      icon: created.icon,
      keywords: JSON.parse(created.keywords) as string[],
      parentId: created.parentId,
    };
  },

  async update(
    id: string,
    data: Partial<Omit<Category, "id">>,
  ): Promise<Category> {
    const updated = await prisma.category.update({
      where: { id },
      data: {
        name: data.name,
        color: data.color,
        icon: data.icon,
        keywords: data.keywords ? JSON.stringify(data.keywords) : undefined,
        parentId: data.parentId,
      },
    });

    return {
      id: updated.id,
      name: updated.name,
      color: updated.color,
      icon: updated.icon,
      keywords: JSON.parse(updated.keywords) as string[],
      parentId: updated.parentId,
    };
  },

  async delete(id: string): Promise<void> {
    // Business rule: Remove category from transactions (set to null)
    await prisma.transaction.updateMany({
      where: { categoryId: id },
      data: { categoryId: null },
    });

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