// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF 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.cloud.bridge.model;

import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

@Entity
@Table(name = "sobject")
public class SObjectVO {
    //private static final long serialVersionUID = 8566744941395660486L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;

    @Column(name = "SBucketID")
    private long bucketID;

    @Column(name = "NameKey")
    private String nameKey;

    @Column(name = "OwnerCanonicalID")
    private String ownerCanonicalId;

    @Column(name = "NextSequence")
    private int nextSequence;

    @Column(name = "DeletionMark")
    private String deletionMark;    // This must also a unique ID to give to the REST client

    @Column(name = "CreateTime")
    @Temporal(value = TemporalType.TIMESTAMP)
    private Date createTime;

    @Transient
    private SBucket bucket;

    @Transient
    private Set<SObjectItemVO> items = new HashSet<SObjectItemVO>();

    public SObjectVO() {
        deletionMark = null;
    }

    public Long getId() {
        return id;
    }

    private void setId(Long id) {
        this.id = id;
    }

    public long getBucketID() {
        return bucketID;
    }

    public void setBucketID(long bucketID) {
        this.bucketID = bucketID;
    }

    public String getNameKey() {
        return nameKey;
    }

    public void setNameKey(String nameKey) {
        this.nameKey = nameKey;
    }

    public String getOwnerCanonicalId() {
        return ownerCanonicalId;
    }

    public void setOwnerCanonicalId(String ownerCanonicalId) {
        this.ownerCanonicalId = ownerCanonicalId;
    }

    public int getNextSequence() {
        return nextSequence;
    }

    public void setNextSequence(int nextSequence) {
        this.nextSequence = nextSequence;
    }

    public String getDeletionMark() {
        return deletionMark;
    }

    public void setDeletionMark(String deletionMark) {
        this.deletionMark = deletionMark;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public SBucket getBucket() {
        return bucket;
    }

    public void setBucket(SBucket bucket) {
        this.bucket = bucket;
    }

    public Set<SObjectItemVO> getItems() {
        return items;
    }

    public void setItems(Set<SObjectItemVO> items) {
        this.items = items;
    }

    public void deleteItem(long id) {
        Iterator<SObjectItemVO> it = getItems().iterator();

        while (it.hasNext()) {
            SObjectItemVO oneItem = it.next();
            if (id == oneItem.getId()) {
                boolean bRemoved = items.remove(oneItem);
                System.out.println("deleteItem from sobject: " + bRemoved);
                return;
            }
        }
    }

    public SObjectItemVO getLatestVersion(boolean versioningOff) {
        Iterator<SObjectItemVO> it = getItems().iterator();
        int maxVersion = 0;
        int curVersion = 0;
        SObjectItemVO latestItem = null;

        while (it.hasNext()) {
            SObjectItemVO item = it.next();

            //    If versioning is off then return the item with the null version string (if exists)
            //    For example, the bucket could have allowed versioning and then it was suspended
            //    If an application wants a specific version it will need to explicitly ask for it
            try {
                String version = item.getVersion();
                if (versioningOff && null == version) {
                    return item;
                }
                curVersion = Integer.parseInt(version);

            } catch (NumberFormatException e) {
                curVersion = 0;
            }

            if (curVersion >= maxVersion) {
                maxVersion = curVersion;
                latestItem = item;
            }
        }
        return latestItem;
    }

    /**
     * S3 versioning allows the client to request the return of a specific version,
     * not just the last version.
     *
     * @param wantVersion
     * @return
     */
    public SObjectItemVO getVersion(String wantVersion) {
        Iterator<SObjectItemVO> it = getItems().iterator();
        while (it.hasNext()) {
            SObjectItemVO item = it.next();
            String curVersion = item.getVersion();
            if (null != curVersion && wantVersion.equalsIgnoreCase(curVersion))
                return item;
        }
        return null;
    }

    @Override
    public boolean equals(Object other) {
        if (this == other)
            return true;

        if (!(other instanceof SObjectVO))
            return false;

        if (!getNameKey().equals(((SObjectVO)other).getNameKey()))
            return false;

        if (getBucket() != null) {
            if (!getBucket().equals(((SObjectVO)other).getBucket()))
                return false;
        } else {
            if (((SObjectVO)other).getBucket() != null)
                return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int hashCode = 0;
        hashCode = hashCode * 17 + getNameKey().hashCode();

        if (getBucket() != null)
            hashCode = hashCode * 17 + getBucket().hashCode();
        return hashCode;
    }
}