package com.vpnpanel;

import android.content.Context;
import android.content.SharedPreferences;
import android.net.VpnService;
import android.util.Log;
import org.json.JSONObject;
import java.io.File;

/**
 * مدیریت تمام پروتکل‌های VPN
 * - OpenVPN
 * - WireGuard
 * - V2Ray (VMess, VLESS)
 * - Shadowsocks
 * - IKEv2/IPSec
 */
public class VPNProtocolManager {
    private static final String TAG = "VPNProtocolManager";
    private Context context;
    private SharedPreferences prefs;
    
    // Protocol Types
    public enum Protocol {
        OPENVPN, WIREGUARD, V2RAY_VMESS, V2RAY_VLESS, SHADOWSOCKS, IKEV2
    }
    
    private Protocol currentProtocol;
    private VPNConnectionCallback callback;
    
    public interface VPNConnectionCallback {
        void onConnected();
        void onDisconnected();
        void onError(String error);
        void onTrafficUpdate(long download, long upload);
    }
    
    public VPNProtocolManager(Context context) {
        this.context = context;
        this.prefs = context.getSharedPreferences("VPNSettings", Context.MODE_PRIVATE);
    }
    
    public void setCallback(VPNConnectionCallback callback) {
        this.callback = callback;
    }
    
    /**
     * اتصال به VPN با پروتکل مشخص
     */
    public void connect(Protocol protocol, JSONObject config) {
        this.currentProtocol = protocol;
        
        Log.d(TAG, "Connecting with protocol: " + protocol.name());
        
        try {
            switch (protocol) {
                case OPENVPN:
                    connectOpenVPN(config);
                    break;
                case WIREGUARD:
                    connectWireGuard(config);
                    break;
                case V2RAY_VMESS:
                    connectV2RayVMess(config);
                    break;
                case V2RAY_VLESS:
                    connectV2RayVLESS(config);
                    break;
                case SHADOWSOCKS:
                    connectShadowsocks(config);
                    break;
                case IKEV2:
                    connectIKEv2(config);
                    break;
            }
        } catch (Exception e) {
            Log.e(TAG, "Connection error: " + e.getMessage());
            if (callback != null) {
                callback.onError(e.getMessage());
            }
        }
    }
    
    /**
     * قطع اتصال VPN
     */
    public void disconnect() {
        Log.d(TAG, "Disconnecting...");
        
        try {
            switch (currentProtocol) {
                case OPENVPN:
                    disconnectOpenVPN();
                    break;
                case WIREGUARD:
                    disconnectWireGuard();
                    break;
                case V2RAY_VMESS:
                case V2RAY_VLESS:
                    disconnectV2Ray();
                    break;
                case SHADOWSOCKS:
                    disconnectShadowsocks();
                    break;
                case IKEV2:
                    disconnectIKEv2();
                    break;
            }
            
            if (callback != null) {
                callback.onDisconnected();
            }
        } catch (Exception e) {
            Log.e(TAG, "Disconnect error: " + e.getMessage());
        }
    }
    
    // ========== OpenVPN ==========
    
    private void connectOpenVPN(JSONObject config) throws Exception {
        String ovpnConfig = config.getString("ovpn_config");
        String username = config.optString("username", "");
        String password = config.optString("password", "");
        
        Log.d(TAG, "Connecting OpenVPN...");
        
        // ذخیره config در فایل
        File configFile = new File(context.getFilesDir(), "client.ovpn");
        java.io.FileWriter writer = new java.io.FileWriter(configFile);
        writer.write(ovpnConfig);
        writer.close();
        
        // شروع OpenVPN Service
        // استفاده از OpenVPN for Android API
        // کد کامل در VPNService پیاده‌سازی می‌شود
        
        if (callback != null) {
            callback.onConnected();
        }
    }
    
    private void disconnectOpenVPN() {
        Log.d(TAG, "Disconnecting OpenVPN...");
        // قطع OpenVPN
    }
    
    // ========== WireGuard ==========
    
    private void connectWireGuard(JSONObject config) throws Exception {
        String privateKey = config.getString("private_key");
        String address = config.getString("address");
        String dns = config.optString("dns", "1.1.1.1");
        String publicKey = config.getString("public_key");
        String endpoint = config.getString("endpoint");
        String allowedIPs = config.optString("allowed_ips", "0.0.0.0/0");
        
        Log.d(TAG, "Connecting WireGuard...");
        
        // ساخت WireGuard Config
        String wgConfig = String.format(
            "[Interface]\n" +
            "PrivateKey = %s\n" +
            "Address = %s\n" +
            "DNS = %s\n\n" +
            "[Peer]\n" +
            "PublicKey = %s\n" +
            "Endpoint = %s\n" +
            "AllowedIPs = %s\n" +
            "PersistentKeepalive = 25",
            privateKey, address, dns, publicKey, endpoint, allowedIPs
        );
        
        // ذخیره config
        File configFile = new File(context.getFilesDir(), "wg0.conf");
        java.io.FileWriter writer = new java.io.FileWriter(configFile);
        writer.write(wgConfig);
        writer.close();
        
        // شروع WireGuard
        // استفاده از WireGuard Tunnel Library
        
        if (callback != null) {
            callback.onConnected();
        }
    }
    
    private void disconnectWireGuard() {
        Log.d(TAG, "Disconnecting WireGuard...");
        // قطع WireGuard
    }
    
    // ========== V2Ray VMess ==========
    
    private void connectV2RayVMess(JSONObject config) throws Exception {
        String address = config.getString("address");
        int port = config.getInt("port");
        String uuid = config.getString("uuid");
        int alterId = config.optInt("alter_id", 0);
        String security = config.optString("security", "auto");
        String network = config.optString("network", "tcp");
        
        Log.d(TAG, "Connecting V2Ray VMess...");
        
        // ساخت V2Ray Config برای VMess
        String v2rayConfig = String.format(
            "{\n" +
            "  \"inbounds\": [{\n" +
            "    \"port\": 10808,\n" +
            "    \"protocol\": \"socks\",\n" +
            "    \"settings\": {\"auth\": \"noauth\", \"udp\": true}\n" +
            "  }],\n" +
            "  \"outbounds\": [{\n" +
            "    \"protocol\": \"vmess\",\n" +
            "    \"settings\": {\n" +
            "      \"vnext\": [{\n" +
            "        \"address\": \"%s\",\n" +
            "        \"port\": %d,\n" +
            "        \"users\": [{\n" +
            "          \"id\": \"%s\",\n" +
            "          \"alterId\": %d,\n" +
            "          \"security\": \"%s\"\n" +
            "        }]\n" +
            "      }]\n" +
            "    },\n" +
            "    \"streamSettings\": {\"network\": \"%s\"}\n" +
            "  }]\n" +
            "}",
            address, port, uuid, alterId, security, network
        );
        
        startV2Ray(v2rayConfig);
    }
    
    // ========== V2Ray VLESS ==========
    
    private void connectV2RayVLESS(JSONObject config) throws Exception {
        String address = config.getString("address");
        int port = config.getInt("port");
        String uuid = config.getString("uuid");
        String encryption = config.optString("encryption", "none");
        String flow = config.optString("flow", "");
        String network = config.optString("network", "tcp");
        
        Log.d(TAG, "Connecting V2Ray VLESS...");
        
        // ساخت V2Ray Config برای VLESS
        String v2rayConfig = String.format(
            "{\n" +
            "  \"inbounds\": [{\n" +
            "    \"port\": 10808,\n" +
            "    \"protocol\": \"socks\",\n" +
            "    \"settings\": {\"auth\": \"noauth\", \"udp\": true}\n" +
            "  }],\n" +
            "  \"outbounds\": [{\n" +
            "    \"protocol\": \"vless\",\n" +
            "    \"settings\": {\n" +
            "      \"vnext\": [{\n" +
            "        \"address\": \"%s\",\n" +
            "        \"port\": %d,\n" +
            "        \"users\": [{\n" +
            "          \"id\": \"%s\",\n" +
            "          \"encryption\": \"%s\",\n" +
            "          \"flow\": \"%s\"\n" +
            "        }]\n" +
            "      }]\n" +
            "    },\n" +
            "    \"streamSettings\": {\"network\": \"%s\"}\n" +
            "  }]\n" +
            "}",
            address, port, uuid, encryption, flow, network
        );
        
        startV2Ray(v2rayConfig);
    }
    
    private void startV2Ray(String config) {
        Log.d(TAG, "Starting V2Ray with config: " + config);
        
        // ذخیره config
        File configFile = new File(context.getFilesDir(), "config.json");
        try {
            java.io.FileWriter writer = new java.io.FileWriter(configFile);
            writer.write(config);
            writer.close();
            
            // شروع V2Ray Core
            // استفاده از AndroidLibV2rayLite
            
            if (callback != null) {
                callback.onConnected();
            }
        } catch (Exception e) {
            Log.e(TAG, "V2Ray start error: " + e.getMessage());
            if (callback != null) {
                callback.onError(e.getMessage());
            }
        }
    }
    
    private void disconnectV2Ray() {
        Log.d(TAG, "Disconnecting V2Ray...");
        // قطع V2Ray
    }
    
    // ========== Shadowsocks ==========
    
    private void connectShadowsocks(JSONObject config) throws Exception {
        String server = config.getString("server");
        int port = config.getInt("port");
        String password = config.getString("password");
        String method = config.optString("method", "aes-256-gcm");
        String plugin = config.optString("plugin", "");
        
        Log.d(TAG, "Connecting Shadowsocks...");
        
        // ساخت Shadowsocks Config
        JSONObject ssConfig = new JSONObject();
        ssConfig.put("server", server);
        ssConfig.put("server_port", port);
        ssConfig.put("password", password);
        ssConfig.put("method", method);
        if (!plugin.isEmpty()) {
            ssConfig.put("plugin", plugin);
        }
        
        // ذخیره config
        File configFile = new File(context.getFilesDir(), "ss-config.json");
        java.io.FileWriter writer = new java.io.FileWriter(configFile);
        writer.write(ssConfig.toString());
        writer.close();
        
        // شروع Shadowsocks
        // استفاده از Shadowsocks-Android Library
        
        if (callback != null) {
            callback.onConnected();
        }
    }
    
    private void disconnectShadowsocks() {
        Log.d(TAG, "Disconnecting Shadowsocks...");
        // قطع Shadowsocks
    }
    
    // ========== IKEv2/IPSec ==========
    
    private void connectIKEv2(JSONObject config) throws Exception {
        String server = config.getString("server");
        String username = config.getString("username");
        String password = config.getString("password");
        String certificate = config.optString("certificate", "");
        
        Log.d(TAG, "Connecting IKEv2...");
        
        // ساخت IKEv2 Profile
        // استفاده از strongSwan Library
        
        if (callback != null) {
            callback.onConnected();
        }
    }
    
    private void disconnectIKEv2() {
        Log.d(TAG, "Disconnecting IKEv2...");
        // قطع IKEv2
    }
    
    /**
     * دریافت وضعیت فعلی اتصال
     */
    public boolean isConnected() {
        // بررسی وضعیت VPN
        return false;
    }
    
    /**
     * دریافت آمار ترافیک
     */
    public long[] getTrafficStats() {
        // [download, upload]
        return new long[]{0, 0};
    }
}