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/*
 * Copyright (C) 2022 Dremio
 *
 * 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 org.projectnessie.model;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import java.io.IOException;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.projectnessie.model.types.ContentTypes;
import org.projectnessie.model.types.RepositoryConfigTypes;

final class Util {

  private Util() {}

  public static final int FIRST_ALLOWED_KEY_CHAR = 0x20;
  public static final char ZERO_BYTE = '\u0000';
  public static final char DOT = '.';
  public static final char GROUP_SEPARATOR = '\u001D';
  public static final char URL_PATH_SEPARATOR = '/';
  public static final String DOT_STRING = ".";
  public static final char REF_HASH_SEPARATOR = '@';

  /**
   * Convert from path encoded string to normal string.
   *
   * @param encoded Path encoded string
   * @return Actual key.
   */
  public static List fromPathString(String encoded) {
    return Arrays.stream(encoded.split("\\."))
        .map(x -> x.replace(GROUP_SEPARATOR, DOT).replace(ZERO_BYTE, DOT))
        .collect(Collectors.toList());
  }

  /**
   * Convert these elements to a URL encoded path string.
   *
   * @return String encoded for path use.
   */
  public static String toPathString(List elements) {
    return elements.stream()
        .map(x -> x.replace(DOT, GROUP_SEPARATOR).replace(ZERO_BYTE, GROUP_SEPARATOR))
        .collect(Collectors.joining("."));
  }

  public static String toPathStringRef(String name, String hash) {
    StringBuilder builder = new StringBuilder();
    boolean separatorRequired = hash != null && !hash.isEmpty() && isHexChar(hash.charAt(0));
    if (name != null) {
      builder.append(name);
      separatorRequired |= name.indexOf(URL_PATH_SEPARATOR) >= 0;
    }

    if (separatorRequired) {
      builder.append(REF_HASH_SEPARATOR);
    }

    if (hash != null) {
      builder.append(hash);
    }

    return builder.toString();
  }

  private static boolean isHexChar(char c) {
    return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
  }

  static final class ContentTypeDeserializer extends JsonDeserializer {
    @Override
    public Content.Type deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
      String name = p.readValueAs(String.class);
      return name != null ? ContentTypes.forName(name) : null;
    }
  }

  static final class ContentTypeSerializer extends JsonSerializer {
    @Override
    public void serialize(Content.Type value, JsonGenerator gen, SerializerProvider serializers)
        throws IOException {
      if (value == null) {
        gen.writeNull();
      } else {
        gen.writeString(value.name());
      }
    }
  }

  static final class RepositoryConfigTypeDeserializer
      extends JsonDeserializer {
    @Override
    public RepositoryConfig.Type deserialize(JsonParser p, DeserializationContext ctxt)
        throws IOException {
      String name = p.readValueAs(String.class);
      return name != null ? RepositoryConfigTypes.forName(name) : null;
    }
  }

  static final class RepositoryConfigTypeSerializer extends JsonSerializer {
    @Override
    public void serialize(
        RepositoryConfig.Type value, JsonGenerator gen, SerializerProvider serializers)
        throws IOException {
      if (value == null) {
        gen.writeNull();
      } else {
        gen.writeString(value.name());
      }
    }
  }

  static class DurationSerializer extends StdSerializer {
    public DurationSerializer() {
      this(Duration.class);
    }

    protected DurationSerializer(Class t) {
      super(t);
    }

    @Override
    public void serialize(Duration value, JsonGenerator gen, SerializerProvider provider)
        throws IOException {
      gen.writeString(value.toString());
    }
  }

  static class DurationDeserializer extends StdDeserializer {
    public DurationDeserializer() {
      this(null);
    }

    protected DurationDeserializer(Class vc) {
      super(vc);
    }

    @Override
    public Duration deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
      return Duration.parse(p.getText());
    }
  }
}