package com.ReactNativeBlobUtil;

import android.net.Uri;
import android.util.Base64;

import com.ReactNativeBlobUtil.Utils.PathResolver;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.modules.core.DeviceEventManagerModule;

import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.util.Locale;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import okhttp3.OkHttpClient;

public class ReactNativeBlobUtilUtils {

    public static X509TrustManager sharedTrustManager;

    public static String getMD5(String input) {
        String result = null;

        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(input.getBytes());
            byte[] digest = md.digest();

            StringBuilder sb = new StringBuilder();

            for (byte b : digest) {
                sb.append(String.format(Locale.ROOT, "%02x", b & 0xff));
            }

            result = sb.toString();
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            // TODO: Is discarding errors the intent? (https://www.owasp.org/index.php/Return_Inside_Finally_Block)
            return result;
        }

    }

    public static void emitWarningEvent(String data) {
        WritableMap args = Arguments.createMap();
        args.putString("event", "warn");
        args.putString("detail", data);

        // emit event to js context
        ReactNativeBlobUtilImpl.RCTContext.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
                .emit(ReactNativeBlobUtilConst.EVENT_MESSAGE, args);
    }

    public static OkHttpClient.Builder getUnsafeOkHttpClient(OkHttpClient client) {
        try {

            if (sharedTrustManager == null) throw new IllegalStateException("Use of own trust manager but none defined");

            final TrustManager[] trustAllCerts = new TrustManager[]{sharedTrustManager};

            // Install the all-trusting trust manager
            final SSLContext sslContext = SSLContext.getInstance("SSL");
            sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
            // Create an ssl socLket factory with our all-trusting manager
            final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

            OkHttpClient.Builder builder = client.newBuilder();
            builder.sslSocketFactory(sslSocketFactory, sharedTrustManager);
            builder.hostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });

            return builder;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * String to byte converter method
     *
     * @param data     Raw data in string format
     * @param encoding Decoder name
     * @return Converted data byte array
     */
    public static byte[] stringToBytes(String data, String encoding) {
        if (encoding.equalsIgnoreCase("ascii")) {
            return data.getBytes(Charset.forName("US-ASCII"));
        } else if (encoding.toLowerCase(Locale.ROOT).contains("base64")) {
            return Base64.decode(data, Base64.NO_WRAP);

        } else if (encoding.equalsIgnoreCase("utf8")) {
            return data.getBytes(Charset.forName("UTF-8"));
        }
        return data.getBytes(Charset.forName("US-ASCII"));
    }

    /**
     * Normalize the path, remove URI scheme (xxx://) so that we can handle it.
     *
     * @param path URI string.
     * @return Normalized string
     */
    public static String normalizePath(String path) {
        if (path == null)
            return null;
        if (!path.matches("\\w+\\:.*"))
            return path;
        if (path.startsWith("file://")) {
            return path.replace("file://", "");
        }

        Uri uri = Uri.parse(path);
        if (path.startsWith(ReactNativeBlobUtilConst.FILE_PREFIX_BUNDLE_ASSET)) {
            return path;
        } else
            return PathResolver.getRealPathFromURI(ReactNativeBlobUtilImpl.RCTContext, uri);
    }

    public static boolean isAsset(String path) {
        return path != null && path.startsWith(ReactNativeBlobUtilConst.FILE_PREFIX_BUNDLE_ASSET);
    }

    public static boolean isContentUri(String path) {
        return path != null && path.startsWith(ReactNativeBlobUtilConst.FILE_PREFIX_CONTENT);
    }
}