"use client";

import { useMemo } from "react";
import { useTransactions } from "@/lib/hooks";
import { useBankingMetadata } from "@/lib/hooks";
import type { TransactionsPaginatedParams } from "@/services/banking.service";

interface UseTransactionsForAccountFilterParams {
  selectedCategories: string[];
  period: "1month" | "3months" | "6months" | "12months" | "custom" | "all";
  customStartDate?: Date;
  customEndDate?: Date;
  showReconciled: string;
  searchQuery: string;
}

/**
 * Hook to fetch transactions filtered by categories, period, search, reconciled
 * but NOT by accounts. Used for displaying account totals in account filter.
 */
export function useTransactionsForAccountFilter({
  selectedCategories,
  period,
  customStartDate,
  customEndDate,
  showReconciled,
  searchQuery,
}: UseTransactionsForAccountFilterParams) {
  const { data: metadata } = useBankingMetadata();

  // Calculate start date based on period
  const startDate = useMemo(() => {
    const now = new Date();
    switch (period) {
      case "1month":
        return new Date(now.getFullYear(), now.getMonth() - 1, 1);
      case "3months":
        return new Date(now.getFullYear(), now.getMonth() - 3, 1);
      case "6months":
        return new Date(now.getFullYear(), now.getMonth() - 6, 1);
      case "12months":
        return new Date(now.getFullYear(), now.getMonth() - 12, 1);
      case "custom":
        return customStartDate || new Date(0);
      default:
        return new Date(0);
    }
  }, [period, customStartDate]);

  // Calculate end date (only for custom period)
  const endDate = useMemo(() => {
    if (period === "custom" && customEndDate) {
      return customEndDate;
    }
    return undefined;
  }, [period, customEndDate]);

  // Build params for fetching all transactions (no pagination, no account filter)
  const filterParams = useMemo<TransactionsPaginatedParams>(() => {
    const params: TransactionsPaginatedParams = {
      limit: 10000, // Large limit to get all transactions
      offset: 0,
      sortField: "date",
      sortOrder: "asc",
    };

    if (startDate && period !== "all") {
      params.startDate = startDate.toISOString().split("T")[0];
    }
    if (endDate) {
      params.endDate = endDate.toISOString().split("T")[0];
    }
    // NOTE: We intentionally don't filter by accounts here
    if (!selectedCategories.includes("all")) {
      if (selectedCategories.includes("uncategorized")) {
        params.includeUncategorized = true;
      } else {
        params.categoryIds = selectedCategories;
      }
    }
    if (searchQuery) {
      params.search = searchQuery;
    }
    if (showReconciled !== "all") {
      params.isReconciled = showReconciled === "reconciled";
    }

    return params;
  }, [
    startDate,
    endDate,
    selectedCategories,
    searchQuery,
    showReconciled,
    period,
  ]);

  // Fetch all filtered transactions (without account filter)
  const { data: transactionsData, isLoading } = useTransactions(
    filterParams,
    !!metadata,
  );

  return {
    transactions: transactionsData?.transactions || [],
    isLoading,
  };
}