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/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.value;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import studio.raptor.sqlparser.fast.api.ErrorCode;
import studio.raptor.sqlparser.fast.message.ParseException;
import studio.raptor.sqlparser.fast.util.MathUtils;

/**
 * Implementation of the INT data type.
 */
public class ValueInt extends Value {

  /**
   * The precision in digits.
   */
  public static final int PRECISION = 10;

  /**
   * The maximum display size of an int.
   * Example: -2147483648
   */
  public static final int DISPLAY_SIZE = 11;

  private static final int STATIC_SIZE = 128;
  // must be a power of 2
  private static final int DYNAMIC_SIZE = 256;
  private static final ValueInt[] STATIC_CACHE = new ValueInt[STATIC_SIZE];
  private static final ValueInt[] DYNAMIC_CACHE = new ValueInt[DYNAMIC_SIZE];

  static {
    for (int i = 0; i < STATIC_SIZE; i++) {
      STATIC_CACHE[i] = new ValueInt(i);
    }
  }

  private final int value;

  private ValueInt(int value) {
    this.value = value;
  }

  /**
   * Get or create an int value for the given int.
   *
   * @param i the int
   * @return the value
   */
  public static ValueInt get(int i) {
    if (i >= 0 && i < STATIC_SIZE) {
      return STATIC_CACHE[i];
    }
    ValueInt v = DYNAMIC_CACHE[i & (DYNAMIC_SIZE - 1)];
    if (v == null || v.value != i) {
      v = new ValueInt(i);
      DYNAMIC_CACHE[i & (DYNAMIC_SIZE - 1)] = v;
    }
    return v;
  }

  private static ValueInt checkRange(long x) {
    if (x < Integer.MIN_VALUE || x > Integer.MAX_VALUE) {
      throw ParseException.get(ErrorCode.NUMERIC_VALUE_OUT_OF_RANGE_1, Long.toString(x));
    }
    return ValueInt.get((int) x);
  }

  @Override
  public Value add(Value v) {
    ValueInt other = (ValueInt) v;
    return checkRange((long) value + (long) other.value);
  }

  @Override
  public int getSignum() {
    return Integer.signum(value);
  }

  @Override
  public Value negate() {
    return checkRange(-(long) value);
  }

  @Override
  public Value subtract(Value v) {
    ValueInt other = (ValueInt) v;
    return checkRange((long) value - (long) other.value);
  }

  @Override
  public Value multiply(Value v) {
    ValueInt other = (ValueInt) v;
    return checkRange((long) value * (long) other.value);
  }

  @Override
  public Value divide(Value v) {
    ValueInt other = (ValueInt) v;
    if (other.value == 0) {
      throw ParseException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
    }
    return ValueInt.get(value / other.value);
  }

  @Override
  public Value modulus(Value v) {
    ValueInt other = (ValueInt) v;
    if (other.value == 0) {
      throw ParseException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
    }
    return ValueInt.get(value % other.value);
  }

  @Override
  public String getSQL() {
    return getString();
  }

  @Override
  public int getType() {
    return INT;
  }

  @Override
  public int getInt() {
    return value;
  }

  @Override
  public long getLong() {
    return value;
  }

  @Override
  protected int compareSecure(Value o, CompareMode mode) {
    ValueInt v = (ValueInt) o;
    return MathUtils.compareInt(value, v.value);
  }

  @Override
  public String getString() {
    return String.valueOf(value);
  }

  @Override
  public long getPrecision() {
    return PRECISION;
  }

  @Override
  public int hashCode() {
    return value;
  }

  @Override
  public Object getObject() {
    return value;
  }

  @Override
  public void set(PreparedStatement prep, int parameterIndex)
      throws SQLException {
    prep.setInt(parameterIndex, value);
  }

  @Override
  public int getDisplaySize() {
    return DISPLAY_SIZE;
  }

  @Override
  public boolean equals(Object other) {
    return other instanceof ValueInt && value == ((ValueInt) other).value;
  }

}