// Copyright (C) 2013 The Android Open Source Project
//
// 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 com.google.gerrit.server.index;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.gerrit.server.index.ChangeField.UPDATED;

import com.google.gerrit.server.query.QueryParseException;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gwtjsonrpc.common.JavaSqlTimestampHelper;

import java.sql.Timestamp;
import java.util.Date;

// TODO: Migrate this to IntegerRangePredicate
public abstract class TimestampRangePredicate<I> extends IndexPredicate<I> {
  @SuppressWarnings({"deprecation", "unchecked"})
  protected static FieldDef<ChangeData, Timestamp> updatedField(
      Schema<ChangeData> schema) {
    if (schema == null) {
      return ChangeField.LEGACY_UPDATED;
    }
    FieldDef<ChangeData, ?> f = schema.getFields().get(UPDATED.getName());
    if (f == null) {
      f = schema.getFields().get(ChangeField.LEGACY_UPDATED.getName());
      checkNotNull(f, "schema missing updated field, found: %s", schema);
    }
    checkArgument(f.getType() == FieldType.TIMESTAMP,
        "expected %s to be TIMESTAMP, found %s", f.getName(), f.getType());
    return (FieldDef<ChangeData, Timestamp>) f;
  }

  protected static Timestamp parse(String value) throws QueryParseException {
    try {
      return JavaSqlTimestampHelper.parseTimestamp(value);
    } catch (IllegalArgumentException e) {
      // parseTimestamp's errors are specific and helpful, so preserve them.
      throw new QueryParseException(e.getMessage(), e);
    }
  }

  protected TimestampRangePredicate(FieldDef<I, Timestamp> def,
      String name, String value) {
    super(def, name, value);
  }

  public abstract Date getMinTimestamp();
  public abstract Date getMaxTimestamp();

  @Override
  public int getCost() {
    return 1;
  }
}