// Offer validation (F22). Same rules as the Odoo constraints; used by the editor (inline) and the server.
import { num } from "./offer-text";

export interface OfferInput {
  name: string;
  badge?: string | null;
  description?: string | null;
  type: string;
  discountType: string;
  discountValue: number | string;
  mixQty: number;
  buyQty: number;
  getQty: number;
  getPercent: number | string;
  startsAt?: string | null;
  endsAt?: string | null;
  maxPerOrder: number;
  sequence: number;
  lines: { productId: string; variantId?: string | null; quantity: number }[];
  scopes: { role: string; kind: string; refId: string }[];
}

export type Errors = Partial<Record<string, string>>;

export function validateOffer(o: OfferInput): Errors {
  const e: Errors = {};
  if (!o.name?.trim()) e.name = "Name is required.";
  else if (o.name.length > 80) e.name = "Use at most 80 characters (it is shown at checkout).";
  if (!["fixed", "mix", "bxgy"].includes(o.type)) e.type = "Choose a bundle type.";
  if (o.startsAt && o.endsAt && new Date(o.endsAt) < new Date(o.startsAt)) {
    e.endsAt = "The end date must be after the start date.";
  }
  if (!(o.maxPerOrder >= 0) || !Number.isInteger(o.maxPerOrder)) e.maxPerOrder = "Use 0 (no limit) or a whole number.";
  if (o.type === "fixed" || o.type === "mix") {
    if (!["percent", "amount", "fixed_price"].includes(o.discountType)) e.discountType = "Choose a discount type.";
    const v = num(o.discountValue);
    if (!(v > 0)) e.discountValue = "The discount value must be greater than 0.";
    else if (o.discountType === "percent" && v > 100) e.discountValue = "A percentage can't be more than 100.";
  }
  if (o.type === "fixed") {
    if (!o.lines.length) e.lines = "Add at least one product to the bundle.";
    else if (o.lines.some((l) => !(l.quantity >= 1) || !Number.isInteger(l.quantity))) e.lines = "Each quantity must be at least 1.";
  }
  if (o.type === "mix") {
    if (!o.scopes.some((s) => s.role === "mix")) e.scopes_mix = "Add products or collections.";
    if (!(o.mixQty >= 1)) e.mixQty = "The number of items must be at least 1.";
  }
  if (o.type === "bxgy") {
    if (!o.scopes.some((s) => s.role === "buy")) e.scopes_buy = "Add what the customer buys.";
    if (!o.scopes.some((s) => s.role === "get")) e.scopes_get = "Add what the customer gets.";
    if (!(o.buyQty >= 1)) e.buyQty = "The buy quantity must be at least 1.";
    if (!(o.getQty >= 1)) e.getQty = "The get quantity must be at least 1.";
    const gp = num(o.getPercent);
    if (!(gp > 0 && gp <= 100)) e.getPercent = "Use a percentage above 0 and up to 100 (100 = free).";
  }
  return e;
}