"use server";
import { cookies } from "next/headers";

import {
  AUTH_COOKIE_NAME,
  BE_BASE_URL,
  REVALIDATE_SECONDS,
  HEALTH_CACHE_TAG,
} from "./constants";
import {
  type IDashboardData,
  type IFetchHealthDataParams,
  type IHealthData,
  type IReviewTransactionsData,
  type ITransactionsOverviewData,
} from "./types";

/**
 * Fetch both health and overview data concurrently
 * This is optimized for initial page load
 * Always includes overview data with the provided date range
 */
export async function fetchDashboardDataService({
  dateStart,
  dateEnd,
}: IFetchHealthDataParams): Promise<IDashboardData> {
  const cookieStore = await cookies();
  const token = cookieStore.get(AUTH_COOKIE_NAME)?.value;

  if (!token) {
    throw new Error("Missing auth token");
  }

  const queryParts: string[] = [];

  // Add date filter if provided
  if (dateStart && dateEnd) {
    queryParts.push(
      `Modified=BETWEEN/${encodeURIComponent(dateStart)}/${encodeURIComponent(dateEnd)}`
    );
  } else if (dateStart) {
    queryParts.push(`Modified=>/${encodeURIComponent(dateStart)}`);
  } else if (dateEnd) {
    queryParts.push(`Modified=</${encodeURIComponent(dateEnd)}`);
  }

  const queryString = queryParts.join("&");

  const fetchConfig = {
    method: "GET",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${token}`,
    },
    next: {
      revalidate: REVALIDATE_SECONDS,
      tags: [HEALTH_CACHE_TAG],
    },
  };

  // Fetch all three endpoints concurrently
  const [healthResponse, overviewResponse, reviewResponse] = await Promise.all([
    fetch(
      `${BE_BASE_URL}/api/v1/transactions/health${
        queryString ? `?${queryString}` : ""
      }`,
      fetchConfig
    ),
    fetch(
      `${BE_BASE_URL}/api/v1/transactions/overview${
        queryString ? `?${queryString}` : ""
      }`,
      fetchConfig
    ),
    fetch(
      `${BE_BASE_URL}/api/v1/transactions?limit=1000&page=1${
        queryString ? `&${queryString}` : ""
      }&Status==/review`,
      fetchConfig
    ),
  ]);

  // Handle health data response
  if (!healthResponse.ok) {
    const errorData = await healthResponse
      .json()
      .catch(() => ({ message: "Failed to fetch health data" }));
    throw new Error(errorData?.message || "Failed to fetch health data");
  }

  const healthData = (await healthResponse.json()) as IHealthData;

  // Handle overview data response
  let overviewData: ITransactionsOverviewData = {
    success: false,
    cancelled: 0,
    failed: 0,
    successful: 0,
    waiting: 0,
  };

  if (!overviewResponse.ok) {
    // Don't fail the whole request if overview fails, just log it
    console.error("Failed to fetch transactions overview");
  } else {
    overviewData = (await overviewResponse.json()) as ITransactionsOverviewData;
  }

  // Handle review transactions response
  let reviewTransactions: IReviewTransactionsData = {
    success: false,
    transactions: [],
    total: 0,
  };

  if (!reviewResponse.ok) {
    // Don't fail the whole request if review transactions fail, just log it
    console.error("Failed to fetch review transactions");
  } else {
    const reviewData = (await reviewResponse.json()) as IReviewTransactionsData;
    reviewTransactions = {
      success: reviewData.success ?? true,
      transactions: reviewData.transactions || [],
      total: reviewData.total || 0,
    };
  }

  return {
    healthData,
    overviewData,
    reviewTransactions,
  };
}