// Auto-generated OrderItem service
import { queryAll, queryOne, execute } from "../db/client.js";
import type { OrderItem, CreateOrderItemInput, UpdateOrderItemInput } from "../types/index.js";

export class OrderItemService {
  /** List all order_items */
  list(): OrderItem[] {
    return queryAll<OrderItem>("SELECT * FROM order_items ORDER BY created_at DESC");
  }

  /** Get by ID */
  getById(id: string): OrderItem | undefined {
    return queryOne<OrderItem>("SELECT * FROM order_items WHERE id = ?", [id]);
  }

  /** Create */
  create(input: CreateOrderItemInput): OrderItem {
    const id = crypto.randomUUID();
    const now = new Date().toISOString();
    const hasCreatedAt = false;
    const hasUpdatedAt = false;
    const cols = ["id", "order_id", "product_id", "quantity", "unit_price"];
    const placeholders = cols.map(() => "?").join(", ");
    const values = [id, input.orderId ?? null, input.productId ?? null, input.quantity ?? null, input.unitPrice ?? null];

    execute(`INSERT INTO order_items (${cols.join(", ")}) VALUES (${placeholders})`, values);
    return this.getById(id)!;
  }

  /** Update */
  update(id: string, input: UpdateOrderItemInput): OrderItem | undefined {
    const existing = this.getById(id);
    if (!existing) return undefined;

    const sets: string[] = [];
    const values: unknown[] = [];
    if (input.orderId !== undefined) { sets.push("order_id = ?"); values.push(input.orderId); }
    if (input.productId !== undefined) { sets.push("product_id = ?"); values.push(input.productId); }
    if (input.quantity !== undefined) { sets.push("quantity = ?"); values.push(input.quantity); }
    if (input.unitPrice !== undefined) { sets.push("unit_price = ?"); values.push(input.unitPrice); }

    if (sets.length === 0) return existing;

    

    values.push(id);
    execute(`UPDATE order_items SET ${sets.join(", ")} WHERE id = ?`, values);
    return this.getById(id)!;
  }

  /** Delete */
  delete(id: string): boolean {
    const result = execute("DELETE FROM order_items WHERE id = ?", [id]);
    return result.changes > 0;
  }
}