import type { Types } from "mongoose";
import { createTransaction } from "@/features/transactions/service";
import { AccountModel } from "@/models/account";
import { CategoryModel } from "@/models/category";
import { TransactionModel } from "@/models/transaction";
import { todayIstanbul } from "@/shared/dates";
import { addDays } from "@/shared/recurrence";

/**
 * Örnek taksitli kart harcamaları (Faz 7b): bir kısmı gerçekleşmiş, kalanı planlı taksitler.
 * İdempotent: aynı satıcıyla taksit planı varsa atlanır.
 */
const PURCHASES = [
  {
    payee: "Hepsiburada",
    description: "Çamaşır makinesi",
    amountMinor: 18_000_00,
    count: 9,
    daysAgo: 75,
    category: "ev",
    by: "admin",
  },
  {
    payee: "Teknosa",
    description: "Telefon",
    amountMinor: 12_000_00,
    count: 6,
    daysAgo: 20,
    category: "diger-gider",
    by: "emre",
  },
];

export async function seedInstallments(
  householdId: Types.ObjectId,
  userIds: Map<string, string>,
): Promise<number> {
  const today = todayIstanbul();
  const card = await AccountModel.findOne({ householdId, name: "Garanti Bonus" }).lean();
  if (!card) return 0;
  let created = 0;
  for (const p of PURCHASES) {
    const exists = await TransactionModel.exists({
      householdId,
      payeeName: p.payee,
      "installment.planId": { $type: "objectId" },
    });
    if (exists) continue;
    const category = await CategoryModel.findOne({ householdId, defaultKey: p.category }).lean();
    const r = await createTransaction(userIds.get(p.by)!, String(householdId), {
      type: "expense",
      amount: p.amountMinor,
      date: addDays(today, -p.daysAgo),
      accountId: String(card._id),
      toAccountId: null,
      categoryId: String(category!._id),
      splits: [],
      payee: p.payee,
      description: p.description,
      tags: [],
      installments: p.count,
      attachmentIds: [],
    });
    if (!r.ok) throw new Error(`Seed taksiti oluşturulamadı (${p.payee}): ${r.error}`);
    created++;
  }
  return created;
}