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package com.litongjava.tio.http.common;

import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;

import com.litongjava.tio.utils.hutool.StrUtil;

/**
 * @author tanyaowu 
 * 2018年7月1日 上午9:51:04
 */
public class HeaderValue implements Serializable {

  private static final long serialVersionUID = -4825039947418801490L;

  public static class EnumerableValue {
    private static final Map map = new HashMap<>();

    public static HeaderValue from(String value) {
      if (StrUtil.isBlank(value)) {
        return null;
      }
      HeaderValue ret = map.get(value);
      if (ret == null) {
        synchronized (map) {
          ret = map.get(value);
          if (ret == null) {
            ret = HeaderValue.from(value);
            map.put(value, ret);
          }
        }
      }
      return ret;
    }

  }

  public static final HeaderValue TRUE = HeaderValue.from("true");
  public static final HeaderValue FALSE = HeaderValue.from("false");

  public static class Connection extends EnumerableValue {
    public static final HeaderValue keep_alive = HeaderValue.from(HttpConst.ResponseHeaderValue.Connection.keep_alive);
    public static final HeaderValue close = HeaderValue.from(HttpConst.ResponseHeaderValue.Connection.close);
    public static final HeaderValue Upgrade = HeaderValue.from(HttpConst.ResponseHeaderValue.Connection.Upgrade);
  }

  public static class Upgrade extends EnumerableValue {
    public static final HeaderValue WebSocket = HeaderValue.from(HttpConst.ResponseHeaderValue.Upgrade.WebSocket);
  }

  public static class Keep_Alive extends EnumerableValue {
    public static final HeaderValue TIMEOUT_10_MAX_20 = HeaderValue.from("timeout=10, max=20");
  }

  public static class Cache_Control {
    public static final HeaderValue MAX_AGE_60 = HeaderValue.from("max-age:60");
  }

  public static class Server {
    public static final HeaderValue TIO = HeaderValue.from(com.litongjava.tio.http.common.HttpConst.SERVER_INFO);
  }

  public static class Content_Encoding extends EnumerableValue {
    public static final HeaderValue gzip = HeaderValue.from("gzip");
  }

  public static class Tio_From_Cache extends EnumerableValue {
    public static final HeaderValue TRUE = HeaderValue.from("true");
    public static final HeaderValue FALSE = HeaderValue.from("false");
  }

  public static class Tio_Webpack_Used_Cache extends EnumerableValue {
    public static final HeaderValue V_1 = HeaderValue.from("1");
  }

  public static class Content_Type extends EnumerableValue {
    public static final HeaderValue TEXT_PLAIN_TXT = HeaderValue.Content_Type.from(MimeType.TEXT_PLAIN_TXT.getType());
    public static final HeaderValue TEXT_PLAIN_JSON = HeaderValue.Content_Type.from(MimeType.TEXT_PLAIN_JSON.getType());
    public static final HeaderValue TEXT_HTML_HTML = HeaderValue.Content_Type.from(MimeType.TEXT_HTML_HTML.getType());
    public static final HeaderValue APPLICATION_ACAD_DWG = HeaderValue.Content_Type.from(MimeType.APPLICATION_ACAD_DWG.getType());
    public static final HeaderValue DEFAULT_TYPE = HeaderValue.Content_Type.from("application/octet-stream");
  }

  public static class Access_Control_Allow_Origin extends EnumerableValue {

  }

  public static class Access_Control_Allow_Headers extends EnumerableValue {

  }

  public static class Access_Control_Allow_Methods extends EnumerableValue {

  }

  public static class Access_Control_Max_Age extends EnumerableValue {

  }

  public final String value;
  public final byte[] bytes;

  private HeaderValue(String name) {
    this.value = name;
    this.bytes = name.getBytes();
  }

  private HeaderValue(String name, String charset) throws UnsupportedEncodingException {
    this.value = name;
    this.bytes = name.getBytes(charset);
  }

  public static HeaderValue from(String name) {
    return new HeaderValue(name);
  }

  public static HeaderValue from(String name, String charset) throws UnsupportedEncodingException {
    return new HeaderValue(name, charset);
  }

  @Override
  public String toString() {
    return value;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((value == null) ? 0 : value.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    HeaderValue other = (HeaderValue) obj;
    if (value == null) {
      if (other.value != null)
        return false;
    } else if (!value.equals(other.value))
      return false;
    return true;
  }

  public long getValueAsLong() {
    return Long.parseLong(value);
  }

  public static HeaderValue fromLong(long value) {
    return new HeaderValue(String.valueOf(value));
  }

  public static HeaderValue getLastModifiedHeader(long timestampMillis) {
    SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
    sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
    String value = sdf.format(new Date(timestampMillis));
    return new HeaderValue(String.valueOf(value));
  }
}