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package com.avaje.ebeaninternal.server.expression;

import com.avaje.ebean.LikeType;
import com.avaje.ebean.event.BeanQueryRequest;
import com.avaje.ebeaninternal.api.SpiExpressionRequest;
import com.avaje.ebeaninternal.server.el.ElPropertyValue;

class LikeExpression extends AbstractExpression implements LuceneAwareExpression {

  private static final long serialVersionUID = -5398151809111172380L;

  private final String val;

  private final boolean caseInsensitive;

  private final LikeType type;

  LikeExpression(FilterExprPath pathPrefix, String propertyName, String value, boolean caseInsensitive, LikeType type) {
    super(pathPrefix, propertyName);
    this.caseInsensitive = caseInsensitive;
    this.type = type;
    this.val = value;
  }

  public void addBindValues(SpiExpressionRequest request) {

    ElPropertyValue prop = getElProp(request);
    if (prop != null && prop.isDbEncrypted()) {
      // bind the key as well as the value
      String encryptKey = prop.getBeanProperty().getEncryptKey().getStringValue();
      request.addBindValue(encryptKey);
    }

    String bindValue = getValue(val, caseInsensitive, type);
    request.addBindValue(bindValue);
  }

  public void addSql(SpiExpressionRequest request) {

    String propertyName = getPropertyName();
    String pname = propertyName;

    ElPropertyValue prop = getElProp(request);
    if (prop != null && prop.isDbEncrypted()) {
      pname = prop.getBeanProperty().getDecryptProperty(propertyName);
    }
    if (caseInsensitive) {
      request.append("lower(").append(pname).append(")");
    } else {
      request.append(pname);
    }
    if (type.equals(LikeType.EQUAL_TO)) {
      request.append(" = ? ");
    } else {
      request.append(" like ? ");
    }
  }

  /**
   * Based on caseInsensitive and the property name.
   */
  public int queryAutoFetchHash() {
    int hc = LikeExpression.class.getName().hashCode();
    hc = hc * 31 + (caseInsensitive ? 0 : 1);
    hc = hc * 31 + propName.hashCode();
    return hc;
  }

  public int queryPlanHash(BeanQueryRequest request) {
    return queryAutoFetchHash();
  }

  public int queryBindHash() {
    return val.hashCode();
  }

  private static String getValue(String value, boolean caseInsensitive, LikeType type) {
    if (caseInsensitive) {
      value = value.toLowerCase();
    }
    switch (type) {
    case RAW:
      return value;
    case STARTS_WITH:
      return value + "%";
    case ENDS_WITH:
      return "%" + value;
    case CONTAINS:
      return "%" + value + "%";
    case EQUAL_TO:
      return value;

    default:
      throw new RuntimeException("LikeType " + type + " missed?");
    }
  }

}