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/*
 * Copyright (c) 2004, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package org.postgresql.core;

import org.postgresql.util.GT;
import org.postgresql.util.PSQLException;
import org.postgresql.util.PSQLState;

import java.lang.reflect.Field;

/**
 * Provides constants for well-known backend OIDs for the types we commonly use.
 */
public class Oid {
  public static final int UNSPECIFIED = 0;
  public static final int INT2 = 21;
  public static final int INT2_ARRAY = 1005;
  public static final int INT4 = 23;
  public static final int INT4_ARRAY = 1007;
  public static final int INT8 = 20;
  public static final int INT8_ARRAY = 1016;
  public static final int TEXT = 25;
  public static final int TEXT_ARRAY = 1009;
  public static final int NUMERIC = 1700;
  public static final int NUMERIC_ARRAY = 1231;
  public static final int FLOAT4 = 700;
  public static final int FLOAT4_ARRAY = 1021;
  public static final int FLOAT8 = 701;
  public static final int FLOAT8_ARRAY = 1022;
  public static final int BOOL = 16;
  public static final int BOOL_ARRAY = 1000;
  public static final int DATE = 1082;
  public static final int DATE_ARRAY = 1182;
  public static final int TIME = 1083;
  public static final int TIME_ARRAY = 1183;
  public static final int TIMETZ = 1266;
  public static final int TIMETZ_ARRAY = 1270;
  public static final int TIMESTAMP = 1114;
  public static final int TIMESTAMP_ARRAY = 1115;
  public static final int TIMESTAMPTZ = 1184;
  public static final int TIMESTAMPTZ_ARRAY = 1185;
  public static final int BYTEA = 17;
  public static final int BYTEA_ARRAY = 1001;
  public static final int VARCHAR = 1043;
  public static final int VARCHAR_ARRAY = 1015;
  public static final int OID = 26;
  public static final int OID_ARRAY = 1028;
  public static final int BPCHAR = 1042;
  public static final int BPCHAR_ARRAY = 1014;
  public static final int MONEY = 790;
  public static final int MONEY_ARRAY = 791;
  public static final int NAME = 19;
  public static final int NAME_ARRAY = 1003;
  public static final int BIT = 1560;
  public static final int BIT_ARRAY = 1561;
  public static final int VOID = 2278;
  public static final int INTERVAL = 1186;
  public static final int INTERVAL_ARRAY = 1187;
  public static final int CHAR = 18; // This is not char(N), this is "char" a single byte type.
  public static final int CHAR_ARRAY = 1002;
  public static final int VARBIT = 1562;
  public static final int VARBIT_ARRAY = 1563;
  public static final int UUID = 2950;
  public static final int UUID_ARRAY = 2951;
  public static final int XML = 142;
  public static final int XML_ARRAY = 143;
  public static final int POINT = 600;
  public static final int POINT_ARRAY = 1017;
  public static final int BOX = 603;
  public static final int JSONB_ARRAY = 3807;
  public static final int JSON = 114;
  public static final int JSON_ARRAY = 199;
  public static final int REF_CURSOR = 1790;
  public static final int REF_CURSOR_ARRAY = 2201;

  /**
   * Returns the name of the oid as string.
   *
   * @param oid The oid to convert to name.
   * @return The name of the oid or {@code ""} if oid no constant for oid value has been
   *         defined.
   */
  public static String toString(int oid) {
    try {
      Field[] fields = Oid.class.getFields();
      for (Field field : fields) {
        if (field.getInt(null) == oid) {
          return field.getName();
        }
      }
    } catch (IllegalAccessException e) {
      // never happens
    }
    return "";
  }

  public static int valueOf(String oid) throws PSQLException {
    try {
      return (int) Long.parseLong(oid);
    } catch (NumberFormatException ex) {
    }
    try {
      oid = oid.toUpperCase();
      Field[] fields = Oid.class.getFields();
      for (Field field : fields) {
        if (field.getName().toUpperCase().equals(oid)) {
          return field.getInt(null);
        }
      }
    } catch (IllegalAccessException e) {
      // never happens
    }
    throw new PSQLException(GT.tr("oid type {0} not known and not a number", oid),
        PSQLState.INVALID_PARAMETER_VALUE);
  }
}