import { NextRequest, NextResponse } from "next/server";
const BE_BASE_URL = process.env.BE_BASE_URL || "http://localhost:5000";
const COOKIE_NAME = "auth_token";

type FilterValue =
  | string
  | {
      operator?: string;
      value: string;
    };

export async function POST(request: NextRequest) {
  try {
    const { cookies } = await import("next/headers");
    const cookieStore = await cookies();
    const token = cookieStore.get(COOKIE_NAME)?.value;

    if (!token) {
      return NextResponse.json(
        { message: "Missing Authorization header" },
        { status: 401 }
      );
    }

    const body = await request.json();
    const { filters = {}, pagination = { page: 1, limit: 10 }, sort } = body;

    // Force deposits filter while allowing other filters to stack
    const mergedFilters: Record<string, FilterValue> = {
      ...filters,
      Type: {
        operator: "==",
        value: "deposit",
      },
    };

    const queryParts: string[] = [];
    queryParts.push(`limit=${pagination.limit}`);
    queryParts.push(`page=${pagination.page}`);

    if (sort) {
      queryParts.push(`sort=${sort.field}:${sort.order}`);
    }

    for (const [key, filterValue] of Object.entries(mergedFilters)) {
      if (!filterValue) continue;

      let operator: string;
      let value: string;

      if (typeof filterValue === "string") {
        operator = "==";
        value = filterValue;
      } else {
        operator = filterValue.operator || "==";
        value = filterValue.value;
      }

      if (!value) continue;

      const encodedValue = encodeURIComponent(value);
      const needsEqualsPrefix = /^[A-Za-z]/.test(operator);
      const operatorSegment = needsEqualsPrefix ? `=${operator}` : operator;

      queryParts.push(`${key}${operatorSegment}/${encodedValue}`);
    }

    const queryString = queryParts.join("&");
    const backendUrl = `${BE_BASE_URL}/api/v1/transactions${
      queryString ? `?${queryString}` : ""
    }`;

    const response = await fetch(backendUrl, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${token}`,
      },
      cache: "no-store",
    });

    if (!response.ok) {
      const errorData = await response
        .json()
        .catch(() => ({ message: "Failed to fetch deposits" }));
      return NextResponse.json(
        {
          success: false,
          message: errorData?.message || "Failed to fetch deposits",
        },
        { status: response.status }
      );
    }

    const data = await response.json();
    return NextResponse.json(data, { status: response.status });
  } catch (err: unknown) {
    console.error(
      "Proxy POST /api/dashboard/transactions/deposits error:",
      err
    );
    const errorMessage = err instanceof Error ? err.message : "Unknown error";
    return NextResponse.json(
      { message: "Internal server error", error: errorMessage },
      { status: 500 }
    );
  }
}