/*
 * Copyright (c) 2016 Uber Technologies, Inc. (hoodie-dev-group@uber.com)
 *
 * 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.uber.hoodie.hadoop;

import org.apache.hadoop.mapreduce.JobContext;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

public class HoodieHiveUtil {
    public static final Logger LOG =
        LogManager.getLogger(HoodieHiveUtil.class);

    public static final String HOODIE_CONSUME_MODE_PATTERN = "hoodie.%s.consume.mode";
    public static final String HOODIE_START_COMMIT_PATTERN = "hoodie.%s.consume.start.timestamp";
    public static final String HOODIE_MAX_COMMIT_PATTERN = "hoodie.%s.consume.max.commits";
    public static final String INCREMENTAL_SCAN_MODE = "INCREMENTAL";
    public static final String LATEST_SCAN_MODE = "LATEST";
    public static final String DEFAULT_SCAN_MODE = LATEST_SCAN_MODE;
    public static final int DEFAULT_MAX_COMMITS = 1;
    public static final int MAX_COMMIT_ALL = -1;

    public static Integer readMaxCommits(JobContext job, String tableName) {
        String maxCommitName = String.format(HOODIE_MAX_COMMIT_PATTERN, tableName);
        int maxCommits = job.getConfiguration().getInt(maxCommitName, DEFAULT_MAX_COMMITS);
        if (maxCommits == MAX_COMMIT_ALL) {
            maxCommits = Integer.MAX_VALUE;
        }
        LOG.info("Read max commits - " + maxCommits);
        return maxCommits;
    }

    public static String readStartCommitTime(JobContext job, String tableName) {
        String startCommitTimestampName = String.format(HOODIE_START_COMMIT_PATTERN, tableName);
        LOG.info("Read start commit time - " + job.getConfiguration().get(startCommitTimestampName));
        return job.getConfiguration().get(startCommitTimestampName);
    }

    public static String readMode(JobContext job, String tableName) {
        String modePropertyName = String.format(HOODIE_CONSUME_MODE_PATTERN, tableName);
        String mode =job.getConfiguration().get(modePropertyName, DEFAULT_SCAN_MODE);
        LOG.info(modePropertyName + ": " + mode);
        return mode;
    }
}