package com.billpaymentservice.bbps;

import java.net.URI;
import java.net.http.*;
import java.util.*;
import java.util.concurrent.*;
import org.json.*;

public class BBPSAutomationTest {

    private static final String BASE_URL = "http://localhost:9090/masterData";
    private static final String BILLER_API = "https://bbps-staging.digiledge.in/agent/cou-master/masters/billers";
    private static final HttpClient client = HttpClient.newHttpClient();

    // Run 10 threads in parallel
    private static final ExecutorService executor = Executors.newFixedThreadPool(10);

    public static void main(String[] args) {
        try {
            System.out.println("🚀 Starting BBPS Test Flow (Multi-Threaded)...\n");

            List<String> categories = getAllCategories();
            if (categories.isEmpty()) {
                System.out.println("❌ No categories found. Exiting...");
                return;
            }

            System.out.println("\n✅ Total Categories Found: " + categories.size());

            int count = 1;
            for (String category : categories) {
                System.out.println("\n📂 [" + count++ + "/" + categories.size() + "] Category: " + category);

                List<String> billerIds = Collections.emptyList();
                try {
                    billerIds = fetchBillersByCategory(category);
                } catch (Exception ex) {
                    System.err.println("⚠️ Skipping category '" + category + "' due to error: " + ex.getMessage());
                    continue; // skip and go to next category
                }

                if (billerIds == null || billerIds.isEmpty()) {
                    System.out.println("⚠️ No billers found for: " + category + " — Skipping...");
                    continue;
                }

                System.out.println("🔹 Found " + billerIds.size() + " billers. Fetching details in parallel...");

                // Run all biller calls in parallel threads
                List<Future<?>> futures = new ArrayList<>();
                for (String billerId : billerIds) {
                    futures.add(executor.submit(() -> {
                        try {
                            sendBillerDetails(billerId);
                        } catch (Exception e) {
                            System.err.println("❌ Error with biller " + billerId + ": " + e.getMessage());
                        }
                    }));
                }

                // Wait for all billers to finish
                for (Future<?> f : futures) {
                    try {
                        f.get();
                    } catch (Exception e) {
                        System.err.println("⚠️ Thread interrupted: " + e.getMessage());
                    }
                }

                System.out.println("✅ Completed all billers for category: " + category);
            }

            executor.shutdown();
            System.out.println("\n🎯 All categories processed successfully (multi-threaded & safe)!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // Step 1 - Get All Categories
    private static List<String> getAllCategories() throws Exception {
        String reqId = UUID.randomUUID().toString();

        JSONObject body = new JSONObject();
        body.put("mid", "ALLCOS00117BHO");
        body.put("reqId", reqId);
        body.put("secretKey", "ABCD1234SECRET");

        JSONObject device = new JSONObject();
        device.put("deviceId", "DEVICE001");
        device.put("deviceName", "Samsung Galaxy S23");
        device.put("os", "Android 14");
        device.put("appVersion", "1.0.5");
        device.put("ipAddress", "192.168.1.101");
        body.put("deviceDetial", device);

        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(BASE_URL + "/getAllMastersData"))
                .header("Content-Type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(body.toString()))
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            System.out.println("❌ getAllMastersData failed | HTTP " + response.statusCode());
            return Collections.emptyList();
        }

        JSONObject json = new JSONObject(response.body());
        JSONArray catArray = json.optJSONObject("data") != null
                ? json.getJSONObject("data").optJSONArray("categoryRespList")
                : null;

        List<String> categories = new ArrayList<>();
        if (catArray != null && catArray.length() > 0) {
            for (int i = 0; i < catArray.length(); i++) {
                categories.add(catArray.getJSONObject(i).getString("categoryName"));
            }
        }

        System.out.println("✅ Categories found: " + categories.size());
        return categories;
    }

    // Step 2 - Fetch Billers by Category
    private static List<String> fetchBillersByCategory(String category) throws Exception {
        // Encode category to handle spaces & special characters safely
        String encodedCategory = java.net.URLEncoder.encode(category, java.nio.charset.StandardCharsets.UTF_8);
        String url = BILLER_API + "?category=" + encodedCategory + "&page=0&pagesize=50";

        HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).GET().build();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

        if (response.statusCode() != 200) {
            System.out.println("❌ Failed to fetch billers for " + category + " | HTTP " + response.statusCode());
            return Collections.emptyList();
        }

        JSONObject json = new JSONObject(response.body());
        JSONArray billersArray = json.optJSONArray("billerResp");

        if (billersArray == null || billersArray.length() == 0) {
            System.out.println("⚠️ billerResp empty or null for category: " + category);
            return Collections.emptyList();
        }

        List<String> billerIds = new ArrayList<>();
        for (int i = 0; i < billersArray.length(); i++) {
            billerIds.add(billersArray.getJSONObject(i).getString("billerId"));
        }

        return billerIds;
    }

    // Step 3 - Get Biller Details
    private static void sendBillerDetails(String billerId) throws Exception {
        String reqId = UUID.randomUUID().toString();

        JSONObject body = new JSONObject();
        body.put("mid", "ALLCOS00117BHO");
        body.put("reqId", reqId);
        body.put("billerId", billerId);
        body.put("secretKey", "ABCD1234SECRET");

        JSONObject device = new JSONObject();
        device.put("deviceId", "DEVICE001");
        device.put("deviceName", "Samsung Galaxy S23");
        device.put("os", "Android 14");
        device.put("appVersion", "1.0.5");
        device.put("ipAddress", "192.168.1.101");
        body.put("deviceDetial", device);

        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(BASE_URL + "/getBillerDetails"))
                .header("Content-Type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(body.toString()))
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

        synchronized (System.out) { // thread-safe log printing
            if (response.statusCode() == 200) {
                System.out.println("✅ Success: " + billerId);
            } else {
                System.out.println("❌ Failed: " + billerId + " | HTTP " + response.statusCode());
            }
        }
    }
}