types.ts

import { ReactNode } from "react";

export interface StockHistoryEntry {
  date: string;
  change: number;
  newStock: number;
  reason: string; // e.g., 'Initial Stock', 'Sale: ORD-XXXX', 'Manual Edit', 'Stock Merge'
}

export interface Part {
  _id: string;
  partNumber: string;
  name: string;
  vehicle: {
    make: string;
    model: string;
    yearStart: number | null;
    yearEnd: number | null;
  };
  category: string;
  brand: string;
  supplierId?: string;
  costPrice: number;
  sellPrice: number;
  currency: string;
  barcode: string;
  stockOnHand: number;
  reorderPoint: number;
  location: string;
  images?: string[];
  notes?: string;
  isActive: boolean;
  stockHistory?: StockHistoryEntry[];
  lastSoldAt?: string;
  createdAt: string;
  updatedAt: string;
}

export interface CartItem extends Part {
  quantity: number;
  discount: number; // KES amount
}

export interface Order {
  id: string;
  date: string;
  items: CartItem[];
  subtotal: number;
  tax: number;
  total: number;
  customer?: { // Optional customer info
    name: string;
    phone?: string;
  };
}

export interface Expense {
  _id: string;
  date: string;
  category: string;
  description: string;
  amount: number;
  createdAt: string;
  updatedAt: string;
}

export interface User {
  _id: string;
  username: string;
  role: 'Admin' | 'Staff';
  token: string;
}