import { ticketTiers, type PaymentMethodId } from "@/content/tickets";

export type PaymentPayload = {
  ticketId: string;
  quantity: number;
  name: string;
  email: string;
  company?: string;
  phone?: string;
  paymentMethod: PaymentMethodId;
  consent: boolean;
};

export function validatePayment(body: unknown): { ok: true; data: PaymentPayload } | { ok: false; error: string } {
  if (!body || typeof body !== "object") {
    return { ok: false, error: "Invalid request body" };
  }

  const b = body as Record<string, unknown>;
  const ticketId = typeof b.ticketId === "string" ? b.ticketId : "";
  const quantity = typeof b.quantity === "number" ? b.quantity : Number(b.quantity);
  const name = typeof b.name === "string" ? b.name.trim() : "";
  const email = typeof b.email === "string" ? b.email.trim() : "";
  const paymentMethod = b.paymentMethod as PaymentMethodId;

  const tier = ticketTiers.find((t) => t.id === ticketId);
  if (!tier || tier.soldOut) {
    return { ok: false, error: "Invalid or unavailable ticket" };
  }
  if (!Number.isInteger(quantity) || quantity < 1 || quantity > 10) {
    return { ok: false, error: "Quantity must be between 1 and 10" };
  }
  if (!name || name.length < 2) {
    return { ok: false, error: "Name is required" };
  }
  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
    return { ok: false, error: "Valid email is required" };
  }
  if (paymentMethod !== "card" && paymentMethod !== "bank") {
    return { ok: false, error: "Invalid payment method" };
  }
  if (b.consent !== true) {
    return { ok: false, error: "You must agree to data collection to complete your order" };
  }

  return {
    ok: true,
    data: {
      ticketId,
      quantity,
      name,
      email,
      paymentMethod,
      company: typeof b.company === "string" ? b.company.trim() : undefined,
      phone: typeof b.phone === "string" ? b.phone.trim() : undefined,
      consent: true,
    },
  };
}

export function calculateTotal(ticketId: string, quantity: number) {
  const tier = ticketTiers.find((t) => t.id === ticketId);
  if (!tier) return 0;
  return tier.priceUsd * quantity;
}