import { NextRequest, NextResponse } from "next/server";
import { transactionService } from "@/services/transaction.service";
import { bankingService } from "@/services/banking.service";
import { requireAuth } from "@/lib/auth-utils";
import type { Transaction } from "@/lib/types";

export async function GET(request: NextRequest) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const { searchParams } = new URL(request.url);

    // Parse pagination params
    const limit = parseInt(searchParams.get("limit") || "50", 10);
    const offset = parseInt(searchParams.get("offset") || "0", 10);

    // Parse filter params
    const startDate = searchParams.get("startDate") || undefined;
    const endDate = searchParams.get("endDate") || undefined;
    const accountIds = searchParams.get("accountIds")
      ? searchParams.get("accountIds")!.split(",")
      : undefined;
    const categoryIds = searchParams.get("categoryIds")
      ? searchParams.get("categoryIds")!.split(",")
      : undefined;
    const includeUncategorized =
      searchParams.get("includeUncategorized") === "true";
    const search = searchParams.get("search") || undefined;
    const isReconciledParam = searchParams.get("isReconciled");
    const isReconciled =
      isReconciledParam === "true"
        ? true
        : isReconciledParam === "false"
          ? false
          : "all";
    const sortField =
      (searchParams.get("sortField") as "date" | "amount" | "description") ||
      "date";
    const sortOrder =
      (searchParams.get("sortOrder") as "asc" | "desc") || "desc";

    const result = await bankingService.getTransactionsPaginated({
      limit,
      offset,
      startDate,
      endDate,
      accountIds,
      categoryIds,
      includeUncategorized,
      search,
      isReconciled,
      sortField,
      sortOrder,
    });

    return NextResponse.json(result, {
      headers: {
        "Cache-Control": "public, s-maxage=60, stale-while-revalidate=120",
      },
    });
  } catch (error) {
    console.error("Error fetching transactions:", error);
    return NextResponse.json(
      { error: "Failed to fetch transactions" },
      { status: 500 },
    );
  }
}

export async function POST(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;
  try {
    const transactions: Transaction[] = await request.json();
    const result = await transactionService.createMany(transactions);
    return NextResponse.json(result);
  } catch (error) {
    console.error("Error creating transactions:", error);
    return NextResponse.json(
      { error: "Failed to create transactions" },
      { status: 500 },
    );
  }
}

export async function PUT(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const transaction: Transaction = await request.json();
    const updated = await transactionService.update(
      transaction.id,
      transaction,
    );
    return NextResponse.json(updated);
  } catch (error) {
    console.error("Error updating transaction:", error);
    return NextResponse.json(
      { error: "Failed to update transaction" },
      { status: 500 },
    );
  }
}

export async function DELETE(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const { searchParams } = new URL(request.url);
    const id = searchParams.get("id");

    if (!id) {
      return NextResponse.json(
        { error: "Transaction ID is required" },
        { status: 400 },
      );
    }

    await transactionService.delete(id);
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("Error deleting transaction:", error);
    return NextResponse.json(
      { error: "Failed to delete transaction" },
      { status: 500 },
    );
  }
}