/*-
 * ============LICENSE_START=======================================================
 * ONAP-REST
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.rest.jpa;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

import com.att.research.xacml.api.pip.PIPException;
import com.att.research.xacml.std.pip.engines.StdConfigurableEngine;
import com.google.common.base.Splitter;


/**
 * The persistent class for the PIPResolver database table.
 * 
 */
@Entity
@Table(name="PIPResolver")
@NamedQuery(name="PIPResolver.findAll", query="SELECT p FROM PIPResolver p")
public class PIPResolver implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="id")
	private int id;

	@Column(name="DESCRIPTION", nullable=true, length=2048)
	private String description;

	@Column(name="NAME", nullable=false, length=255)
	private String name;

	@Column(name="ISSUER", nullable=true, length=1024)
	private String issuer;

	@Column(name="CLASSNAME", nullable=false, length=2048)
	private String classname;

	@Column(name="READ_ONLY", nullable=false)
	private char readOnly = '0';

	@Column(name="CREATED_BY", nullable=false, length=255)
	private String createdBy = "guest";

	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="CREATED_DATE", nullable=false, updatable=false)
	private Date createdDate;

	@Column(name="MODIFIED_BY", nullable=false, length=255)
	private String modifiedBy = "guest";

	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="MODIFIED_DATE", nullable=false)
	private Date modifiedDate;

	//bi-directional many-to-one association to PIPConfiguration
	@ManyToOne
	@JoinColumn(name="PIP_ID")
	private PIPConfiguration pipconfiguration;

	//bi-directional many-to-one association to PIPResolverParam
	@OneToMany(mappedBy="pipresolver", orphanRemoval=true, cascade=CascadeType.REMOVE)
	private Set<PIPResolverParam> pipresolverParams = new HashSet<>();

	public PIPResolver() {
		//An empty constructor
	}
	
	public PIPResolver(String prefix, Properties properties, String user) throws PIPException {
		this.createdBy = user;
		this.modifiedBy = user;
		this.readOnly = '0';
		this.readProperties(prefix, properties);
	}
	
	public PIPResolver(PIPResolver resolver) {
		this.name = resolver.name;
		this.description = resolver.description;
		this.issuer = resolver.issuer;
		this.classname = resolver.classname;
		this.readOnly = resolver.readOnly;
		for (PIPResolverParam param : this.pipresolverParams) {
			this.addPipresolverParam(new PIPResolverParam(param));
		}
	}

	@PrePersist
	public void	prePersist() {
		Date date = new Date();
		this.createdDate = date;
		this.modifiedDate = date;
	}
	
	@PreUpdate
	public void preUpdate() {
		this.modifiedDate = new Date();
	}

	public int getId() {
		return this.id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getDescription() {
		return this.description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getIssuer() {
		return issuer;
	}

	public void setIssuer(String issuer) {
		this.issuer = issuer;
	}

	public String getClassname() {
		return classname;
	}

	public void setClassname(String classname) {
		this.classname = classname;
	}

	public char getReadOnly() {
		return readOnly;
	}

	public void setReadOnly(char readOnly) {
		this.readOnly = readOnly;
	}

	public String getCreatedBy() {
		return createdBy;
	}

	public void setCreatedBy(String createdBy) {
		this.createdBy = createdBy;
	}

	public Date getCreatedDate() {
		return createdDate;
	}

	public void setCreatedDate(Date createdDate) {
		this.createdDate = createdDate;
	}

	public String getModifiedBy() {
		return modifiedBy;
	}

	public void setModifiedBy(String modifiedBy) {
		this.modifiedBy = modifiedBy;
	}

	public Date getModifiedDate() {
		return modifiedDate;
	}

	public void setModifiedDate(Date modifiedDate) {
		this.modifiedDate = modifiedDate;
	}

	public PIPConfiguration getPipconfiguration() {
		return this.pipconfiguration;
	}

	public void setPipconfiguration(PIPConfiguration pipconfiguration) {
		this.pipconfiguration = pipconfiguration;
	}

	public Set<PIPResolverParam> getPipresolverParams() {
		return this.pipresolverParams;
	}

	public void setPipresolverParams(Set<PIPResolverParam> pipresolverParams) {
		this.pipresolverParams = pipresolverParams;
	}

	public PIPResolverParam addPipresolverParam(PIPResolverParam pipresolverParam) {
		getPipresolverParams().add(pipresolverParam);
		pipresolverParam.setPipresolver(this);

		return pipresolverParam;
	}

	public PIPResolverParam removePipresolverParam(PIPResolverParam pipresolverParam) {
		if (pipresolverParam == null) {
			return pipresolverParam;
		}
		getPipresolverParams().remove(pipresolverParam);
		pipresolverParam.setPipresolver(null);

		return pipresolverParam;
	}
	
	@Transient
	public void clearParams() {
		while (this.pipresolverParams.isEmpty() == false) {
			this.removePipresolverParam(this.pipresolverParams.iterator().next());
		}
	}

	@Transient
	public boolean isReadOnly() {
		return this.readOnly == '1';
	}
	
	@Transient
	public void setReadOnly(boolean readOnly) {
		if (readOnly) {
			this.readOnly = '1';
		} else {
			this.readOnly = '0';
		}
	}
	
	@Transient
	public static Collection<PIPResolver>	importResolvers(String prefix, String list, Properties properties, String user) throws PIPException {
		Collection<PIPResolver> resolvers = new ArrayList<>();
		for (String id : Splitter.on(',').trimResults().omitEmptyStrings().split(list)) {
			resolvers.add(new PIPResolver(prefix + "." + id, properties, user));
		}		
		return resolvers;
	}

	@Transient
	protected void readProperties(String prefix, Properties properties) throws PIPException {
		//
		// Get its classname, this MUST exist.
		//
		this.classname = properties.getProperty(prefix + ".classname");
		if (this.classname == null) {
			throw new PIPException("PIP Engine defined without a classname");
		}
		//
		// Go through each property
		//
		for (Object nme : properties.keySet()) {
			if (nme.toString().startsWith(prefix) == false) {
				continue;
			}
			if (nme.equals(prefix + ".classname")) {
				//
				// We already saved this
				//
			} else if (nme.equals(prefix + "." + StdConfigurableEngine.PROP_NAME)) {
				this.name = properties.getProperty(nme.toString());
			} else if (nme.equals(prefix + "." + StdConfigurableEngine.PROP_DESCRIPTION)) {
				this.description = properties.getProperty(nme.toString());
			} else if (nme.equals(prefix + "." + StdConfigurableEngine.PROP_ISSUER)) {
				this.issuer = properties.getProperty(nme.toString());
			} else {
				this.addPipresolverParam(new PIPResolverParam(nme.toString().substring(prefix.length() + 1),
															properties.getProperty(nme.toString())));
			}
		}
	}

	@Transient
	public Map<String, String> getConfiguration(String prefix) {
		String pref = prefix;
		Map<String, String> map = new HashMap<>();
		if (prefix.endsWith(".") == false) {
			pref = prefix + ".";
		}
		map.put(pref + "classname", this.classname);
		map.put(pref + "name", this.name);
		if (this.description != null) {
			map.put(pref + "description", this.description);
		}
		if (this.issuer != null && this.issuer.isEmpty() != false) {
			map.put(pref + "issuer", this.issuer);
		}
		for (PIPResolverParam param : this.pipresolverParams) {
			map.put(pref + param.getParamName(), param.getParamValue());
		}
		return map;
	}

	@Transient
	public void	generateProperties(Properties props, String prefix) {
		String pref = prefix;
		if (prefix.endsWith(".") == false) {
			pref = prefix + ".";
		}
		props.setProperty(pref + "classname", this.classname);
		props.setProperty(pref + "name", this.name);
		if (this.description != null) {
			props.setProperty(pref + "description", this.description);
		}
		if (this.issuer != null && this.issuer.isEmpty() != false) {
			props.setProperty(pref + "issuer", this.issuer);
		}
		for (PIPResolverParam param : this.pipresolverParams) {
			props.setProperty(pref + param.getParamName(), param.getParamValue());
		}
	}

	@Transient
	@Override
	public String toString() {
		return "PIPResolver [id=" + id + ", classname=" + classname + ", name="
				+ name + ", description=" + description + ", issuer=" + issuer
				+ ", readOnly=" + readOnly + ", createdBy=" + createdBy
				+ ", createdDate=" + createdDate + ", modifiedBy=" + modifiedBy
				+ ", modifiedDate=" + modifiedDate + ", pipresolverParams="
				+ pipresolverParams + "]";
	}
}