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/*
 * Copyright 2010-2014 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 org.killbill.billing.invoice.tree;

import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.annotation.Nullable;

import org.joda.time.LocalDate;

import org.killbill.billing.invoice.api.InvoiceItem;
import org.killbill.billing.invoice.tree.Item.ItemAction;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;
import com.google.common.collect.Iterables;
import com.google.common.collect.Ordering;

/**
 * Tree of invoice items for a given subscription.
 */
public class SubscriptionItemTree {

    private final UUID targetInvoiceId;
    private final UUID subscriptionId;

    private ItemsNodeInterval root;
    private boolean isBuilt;
    private List items;
    private List existingFixedItems;
    private Map remainingFixedItems;
    private List pendingItemAdj;

    private static final Comparator INVOICE_ITEM_COMPARATOR = new Comparator() {
        @Override
        public int compare(final InvoiceItem o1, final InvoiceItem o2) {
            int startDateComp = o1.getStartDate().compareTo(o2.getStartDate());
            if (startDateComp != 0) {
                return startDateComp;
            }
            int itemTypeComp =  (o1.getInvoiceItemType().ordinal()
     * When called prior, the merge this gives a flat view of the existing items on disk
     * When called after the merge with proposed items, this gives the list of items that should now be written to disk -- new fixed, recurring and repair.
     * 
     * @return a flat view of the items in the tree.
     */
    public List getView() {

        final List tmp = new LinkedList();
        tmp.addAll(remainingFixedItems.values());
        tmp.addAll(Collections2.filter(Collections2.transform(items, new Function() {
            @Override
            public InvoiceItem apply(final Item input) {
                return input.toInvoiceItem();
            }
        }), new Predicate() {
            @Override
            public boolean apply(@Nullable final InvoiceItem input) {
                return input != null;
            }
        }));

        final List result = Ordering.from(INVOICE_ITEM_COMPARATOR).sortedCopy(tmp);
        checkItemsListState(result);
        return result;
    }

    // Verify there is no double billing, and no double repair (credits)
    private void checkItemsListState(final List orderedList) {

        LocalDate prevRecurringEndDate = null;
        LocalDate prevRepairEndDate = null;
        for (InvoiceItem cur : orderedList) {
            switch (cur.getInvoiceItemType()) {
                case FIXED:
                    break;

                case RECURRING:
                    if (prevRecurringEndDate != null) {
                        Preconditions.checkState(prevRecurringEndDate.compareTo(cur.getStartDate()) <= 0);
                    }
                    prevRecurringEndDate = cur.getEndDate();
                    break;

                case REPAIR_ADJ:
                    if (prevRepairEndDate != null) {
                        Preconditions.checkState(prevRepairEndDate.compareTo(cur.getStartDate()) <= 0);
                    }
                    prevRepairEndDate = cur.getEndDate();
                    break;

                default:
                    Preconditions.checkState(false, "Unexpected item type " + cur.getInvoiceItemType());
            }
        }
    }

    public UUID getSubscriptionId() {
        return subscriptionId;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof SubscriptionItemTree)) {
            return false;
        }

        final SubscriptionItemTree that = (SubscriptionItemTree) o;

        if (root != null ? !root.equals(that.root) : that.root != null) {
            return false;
        }
        if (subscriptionId != null ? !subscriptionId.equals(that.subscriptionId) : that.subscriptionId != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = subscriptionId != null ? subscriptionId.hashCode() : 0;
        result = 31 * result + (root != null ? root.hashCode() : 0);
        return result;
    }

    @VisibleForTesting
    ItemsNodeInterval getRoot() {
        return root;
    }
}