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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.scheduler.schedule;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableMap;
import org.graylog.scheduler.JobSchedule;
import org.graylog.scheduler.clock.JobSchedulerClock;
import org.joda.time.DateTime;

import javax.validation.constraints.Min;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;

@AutoValue
@JsonTypeName(IntervalJobSchedule.TYPE_NAME)
@JsonDeserialize(builder = IntervalJobSchedule.Builder.class)
public abstract class IntervalJobSchedule implements JobSchedule {
    public static final String TYPE_NAME = "interval";

    public static final String FIELD_INTERVAL = "interval";
    public static final String FIELD_UNIT = "unit";

    @JsonProperty(FIELD_INTERVAL)
    @Min(1)
    public abstract long interval();

    @JsonProperty(FIELD_UNIT)
    public abstract TimeUnit unit();

    @JsonIgnore
    @Override
    public Optional calculateNextTime(DateTime lastExecutionTime, DateTime lastNextTime, JobSchedulerClock clock) {
        return Optional.of(lastNextTime.plus(unit().toMillis(interval())));
    }

    @Override
    public Optional> toDBUpdate(String fieldPrefix) {
        return Optional.of(ImmutableMap.of(
                fieldPrefix + JobSchedule.TYPE_FIELD, type(),
                fieldPrefix + FIELD_INTERVAL, interval(),
                fieldPrefix + FIELD_UNIT, unit()
        ));
    }

    public static Builder builder() {
        return Builder.create();
    }

    public abstract Builder toBuilder();

    @AutoValue.Builder
    public static abstract class Builder implements JobSchedule.Builder {
        @JsonCreator
        public static Builder create() {
            return new AutoValue_IntervalJobSchedule.Builder().type(TYPE_NAME);
        }

        @JsonProperty(FIELD_INTERVAL)
        public abstract Builder interval(long interval);

        @JsonProperty(FIELD_UNIT)
        public abstract Builder unit(TimeUnit unit);

        abstract IntervalJobSchedule autoBuild();

        public IntervalJobSchedule build() {
            // Make sure the type name is correct!
            type(TYPE_NAME);

            return autoBuild();
        }
    }
}