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/*
 * Copyright 2017 Google Inc.
 *
 * 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.google.firebase.database.utilities;

import static com.google.firebase.database.utilities.Utilities.hardAssert;

import com.google.firebase.database.DatabaseException;
import com.google.firebase.database.core.Path;
import com.google.firebase.database.core.ServerValues;
import com.google.firebase.database.core.ValidationPath;
import com.google.firebase.database.snapshot.ChildKey;
import com.google.firebase.database.snapshot.Node;
import com.google.firebase.database.snapshot.NodeUtilities;
import com.google.firebase.database.snapshot.PriorityUtilities;

import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.regex.Pattern;

public class Validation {

  private static final Pattern INVALID_PATH_REGEX = Pattern.compile("[\\[\\]\\.#$]");
  // CSOFF: AvoidEscapedUnicodeCharacters
  private static final Pattern INVALID_KEY_REGEX =
      Pattern.compile("[\\[\\]\\.#\\$\\/\\u0000-\\u001F\\u007F]");
  // CSON: AvoidEscapedUnicodeCharacters

  private static boolean isValidPathString(String pathString) {
    return !INVALID_PATH_REGEX.matcher(pathString).find();
  }

  public static void validatePathString(String pathString) throws DatabaseException {
    if (!isValidPathString(pathString)) {
      throw new DatabaseException(
          "Invalid Firebase Database path: "
              + pathString
              + ". Firebase Database paths must not contain '.', '#', '$', '[', or ']'");
    }
  }

  public static void validateRootPathString(String pathString) throws DatabaseException {
    if (pathString.startsWith(".info")) {
      validatePathString(pathString.substring(5));
    } else if (pathString.startsWith("/.info")) {
      validatePathString(pathString.substring(6));
    } else {
      validatePathString(pathString);
    }
  }

  private static boolean isWritableKey(String key) {
    return key != null
        && key.length() > 0
        && (key.equals(".value")
            || key.equals(".priority")
            || (!key.startsWith(".") && !INVALID_KEY_REGEX.matcher(key).find()));
  }

  private static boolean isValidKey(String key) {
    return key.equals(".info") || !INVALID_KEY_REGEX.matcher(key).find();
  }

  public static void validateNullableKey(String key) throws DatabaseException {
    if (!(key == null || isValidKey(key))) {
      throw new DatabaseException(
          "Invalid key: " + key + ". Keys must not contain '/', '.', '#', '$', '[', or ']'");
    }
  }

  private static void validateDoubleValue(double d) {
    if (Double.isInfinite(d) || Double.isNaN(d)) {
      throw new DatabaseException("Invalid value: Value cannot be NaN, Inf or -Inf.");
    }
  }

  private static boolean isWritablePath(Path path) {
    // Getting a path with invalid keys will throw earlier in the process, so we should just
    // check the first token
    ChildKey front = path.getFront();
    return front == null || !front.asString().startsWith(".");
  }

  @SuppressWarnings("unchecked")
  public static void validateWritableObject(Object object) {
    if (object instanceof Map) {
      Map map = (Map) object;
      if (map.containsKey(ServerValues.NAME_SUBKEY_SERVERVALUE)) {
        // This will be short-circuited by conversion and we consider it valid
        return;
      }
      for (Map.Entry entry : map.entrySet()) {
        validateWritableKey(entry.getKey());
        validateWritableObject(entry.getValue());
      }
    } else if (object instanceof List) {
      List