import type { Types } from "mongoose";
import { budgetFromActuals, saveBudget } from "@/features/budgets/service";
import { BudgetModel } from "@/models/budget";
import { CategoryModel } from "@/models/category";
import { HouseholdModel } from "@/models/household";
import { periodOfDate, shiftMonth } from "@/shared/budget";
import { todayIstanbul } from "@/shared/dates";
import { budgetLimitsSchema } from "@/shared/schemas/budget";
import { formatMoneyInput } from "@/shared/money";

/**
 * Örnek bütçeler (Faz 10a): Çakır Ailesi'nde önceki ve bu ay, önceki ayların harcamalarından
 * oluşturulur. Bu ay "Market" limiti biraz düşürülür ve "Elektrik" alt limiti eklenir; böylece
 * uyarı ve alt limit örnekleri görünür. İdempotent: bütçesi olan aya dokunulmaz.
 */
export async function seedBudgets(
  householdIds: Map<string, Types.ObjectId>,
  userIds: Map<string, string>,
): Promise<number> {
  const householdId = householdIds.get("Çakır Ailesi")!;
  const by = userIds.get("ayse")!;
  const hh = String(householdId);
  const h = await HouseholdModel.findById(householdId).select({ settings: 1 }).lean();
  const current = periodOfDate(todayIstanbul(), h?.settings?.budgetMonthStartDay ?? 1);
  let created = 0;
  for (const month of [shiftMonth(current, -1), current]) {
    if (await BudgetModel.exists({ householdId, month })) continue;
    const r = await budgetFromActuals(by, hh, month);
    if (!r.ok) continue;
    created++;
  }
  if (created && (await BudgetModel.exists({ householdId, month: current }))) {
    const doc = (await BudgetModel.findOne({ householdId, month: current }).lean())!;
    const cats = await CategoryModel.find({
      householdId,
      defaultKey: { $in: ["market", "faturalar.elektrik"] },
    }).lean();
    const id = (key: string) => String(cats.find((c) => c.defaultKey === key)?._id ?? "");
    const limits = doc.limits.map((l) => ({
      categoryId: String(l.categoryId),
      amount: formatMoneyInput(
        String(l.categoryId) === id("market") ? Math.round(l.amountMinor * 0.7) : l.amountMinor,
      ),
    }));
    if (id("faturalar.elektrik"))
      limits.push({ categoryId: id("faturalar.elektrik"), amount: "900" });
    await saveBudget(by, hh, budgetLimitsSchema.parse({ month: current, limits }));
  }
  return created;
}