/**
 * Copyright (c) 2015, The CyanogenMod Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dialer.lookup.auskunft;

import android.content.Context;
import android.net.Uri;
import android.util.Log;

import com.android.dialer.lookup.LookupUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public final class AuskunftApi {
  private static final String TAG = AuskunftApi.class.getSimpleName();

  private static final String PEOPLE_LOOKUP_URL = "https://auskunft.at/suche";

  private static final String SEARCH_RESULTS_REGEX =
      "(?i)<section[\\s]+class=[\"']?search-entry(.*?)?</section";
  private static final String NAME_REGEX =
      "(?i)<h1[\\s]+itemprop=[\"']?name[\"']?>(.*?)</h1";
  private static final String NUMBER_REGEX =
      "(?i)phone[\"'][\\s]+?href=[\"']{1}tel:(.*?)[\"']{1}";
  private static final String ADDRESS_REGEX =
      "(?i)<span[\\s]+itemprop=[\"']?streetAddress[\"']?>(.*?)</a";

  private static final String BUSINESS_IDENTIFIER = "(Firma)";

  private AuskunftApi() {
  }

  public static List<ContactInfo> query(String filter) throws IOException {
    // build URI
    Uri uri = Uri.parse(PEOPLE_LOOKUP_URL)
        .buildUpon()
        .appendQueryParameter("query", filter)
        .build();

    // get all search entry sections
    List<String> entries = LookupUtils.allRegexResults(
        LookupUtils.httpGet(uri.toString(), null), SEARCH_RESULTS_REGEX, true);

    // abort lookup if nothing found
    if (entries == null || entries.isEmpty()) {
      Log.w(TAG, "nothing found");
      return null;
    }

    // build response by iterating through the search entries and parsing their HTML data
    List<ContactInfo> infos = new ArrayList<ContactInfo>();
    for (String entry : entries) {
      // parse wanted data and replace null values
      String name = replaceNullResult(LookupUtils.firstRegexResult(entry, NAME_REGEX, true));
      String address = replaceNullResult(LookupUtils.firstRegexResult(entry, ADDRESS_REGEX, true));
      String number = replaceNullResult(LookupUtils.firstRegexResult(entry, NUMBER_REGEX, true));
      // ignore entry if name or number is empty (should not occur)
      // missing addresses won't be a problem (but do occur)
      if (name.isEmpty() || number.isEmpty()) {
        continue;
      }

      ContactInfo info = new ContactInfo();
      info.name = cleanupResult(name);
      info.number = cleanupResult(number);
      info.address = cleanupResult(address);
      info.url = uri.toString();

      infos.add(info);
    }
    return infos;
  }

  private static String cleanupResult(String result) {
    // get displayable text
    result = LookupUtils.fromHtml(result);
    // replace newlines with spaces
    result = result.replaceAll("\\r|\\n", " ");
    // replace multiple spaces with one
    result = result.replaceAll("\\s+", " ");
    // remove business identifier that is originally not part of the name
    result = result.replace(BUSINESS_IDENTIFIER, "");
    // final trimming
    result = result.trim();

    return result;
  }

  private static String replaceNullResult(String result) {
    return (result == null) ? "" : result;
  }

  static class ContactInfo {
    String name;
    String number;
    String url;
    String address;
  };
}