/*
 * Copyright 2010-2011 Ning, Inc.
 *
 * Ning licenses this file to you 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.ning.billing.entitlement.api.user;

import java.lang.reflect.Field;
import java.util.List;
import java.util.UUID;

import org.joda.time.DateTime;

import com.ning.billing.catalog.api.CatalogService;
import com.ning.billing.catalog.api.ProductCategory;
import com.ning.billing.entitlement.api.SubscriptionApiService;
import com.ning.billing.entitlement.api.SubscriptionFactory;
import com.ning.billing.entitlement.events.EntitlementEvent;
import com.ning.billing.entitlement.exceptions.EntitlementError;
import com.ning.billing.util.clock.Clock;

import com.google.inject.Inject;

public class DefaultSubscriptionFactory implements SubscriptionFactory {
    private final SubscriptionApiService apiService;
    private final Clock clock;
    private final CatalogService catalogService;

    @Inject
    public DefaultSubscriptionFactory(final SubscriptionApiService apiService, final Clock clock, final CatalogService catalogService) {
        this.apiService = apiService;
        this.clock = clock;
        this.catalogService = catalogService;
    }

    @Override
    public SubscriptionData createSubscription(final SubscriptionBuilder builder, final List<EntitlementEvent> events) {
        final SubscriptionData subscription = new SubscriptionData(builder, apiService, clock);
        if (events.size() > 0) {
            subscription.rebuildTransitions(events, catalogService.getFullCatalog());
        }
        return subscription;
    }

    public static class SubscriptionBuilder {
        private UUID id;
        private UUID bundleId;
        private DateTime alignStartDate;
        private DateTime bundleStartDate;
        private Long activeVersion;
        private ProductCategory category;
        private DateTime chargedThroughDate;
        private DateTime paidThroughDate;

        public SubscriptionBuilder() {
            this.activeVersion = SubscriptionEvents.INITIAL_VERSION;
        }

        public SubscriptionBuilder(final SubscriptionData original) {
            this.id = original.getId();
            this.bundleId = original.getBundleId();
            this.alignStartDate = original.getAlignStartDate();
            this.bundleStartDate = original.getBundleStartDate();
            this.category = original.getCategory();
            this.activeVersion = original.getActiveVersion();
            this.chargedThroughDate = original.getChargedThroughDate();
            this.paidThroughDate = original.getPaidThroughDate();
        }

        public SubscriptionBuilder setId(final UUID id) {
            this.id = id;
            return this;
        }

        public SubscriptionBuilder setBundleId(final UUID bundleId) {
            this.bundleId = bundleId;
            return this;
        }

        public SubscriptionBuilder setAlignStartDate(final DateTime alignStartDate) {
            this.alignStartDate = alignStartDate;
            return this;
        }

        public SubscriptionBuilder setBundleStartDate(final DateTime bundleStartDate) {
            this.bundleStartDate = bundleStartDate;
            return this;
        }

        public SubscriptionBuilder setActiveVersion(final long activeVersion) {
            this.activeVersion = activeVersion;
            return this;
        }

        public SubscriptionBuilder setChargedThroughDate(final DateTime chargedThroughDate) {
            this.chargedThroughDate = chargedThroughDate;
            return this;
        }

        public SubscriptionBuilder setPaidThroughDate(final DateTime paidThroughDate) {
            this.paidThroughDate = paidThroughDate;
            return this;
        }

        public SubscriptionBuilder setCategory(final ProductCategory category) {
            this.category = category;
            return this;
        }

        public UUID getId() {
            return id;
        }

        public UUID getBundleId() {
            return bundleId;
        }

        public DateTime getAlignStartDate() {
            return alignStartDate;
        }

        public DateTime getBundleStartDate() {
            return bundleStartDate;
        }

        public Long getActiveVersion() {
            return activeVersion;
        }

        public ProductCategory getCategory() {
            return category;
        }

        public DateTime getChargedThroughDate() {
            return chargedThroughDate;
        }

        public DateTime getPaidThroughDate() {
            return paidThroughDate;
        }

        private void checkAllFieldsSet() {
            for (final Field cur : SubscriptionBuilder.class.getDeclaredFields()) {
                try {
                    final Object value = cur.get(this);
                    if (value == null) {
                        throw new EntitlementError(String.format("Field %s has not been set for Subscription",
                                                                 cur.getName()));
                    }
                } catch (IllegalAccessException e) {
                    throw new EntitlementError(String.format("Failed to access value for field %s for Subscription",
                                                             cur.getName()), e);
                }
            }
        }
    }

    public SubscriptionApiService getApiService() {
        return apiService;
    }

    public CatalogService getCatalogService() {
        return catalogService;
    }

    public Clock getClock() {
        return clock;
    }
}
