/*
Copyright 1999-2011 (c) My-Channels
Copyright (c) 2012-2014 Software AG, Darmstadt, Germany and/or Software AG USA Inc., Reston, VA, USA, and/or its subsidiaries and/or its affiliates and/or their licensors.

Use, reproduction, transfer, publication or disclosure is prohibited except as specifically provided for in your License Agreement with Software AG.
*/

using System;
using System.Collections.Generic;

namespace com.pcbsys.nirvana.nAdminAPI.apps
{

    using com.pcbsys.nirvana.nAdminAPI;
    using com.pcbsys.nirvana.client;

    ///
    /// <summary> * This application can be used to change permissions for a subject on a channel </summary>
    /// 

    public class modchanacl
    {

        ///  
        ///   <summary> * Private variables used in this application </summary>
        ///   
        public const string everyone = "everyone";
        public const string everywhere = "everywhere";

        private string realm = null;
        private string name = null;
        private string host = null;
        private bool pattern = false;
        private bool factory = false;
        private bool canListAcl = false;
        private bool canModifyAcl = false;
        private bool fullPrivileges = false;
        private bool canGetLastEid = false;
        private bool canRead = false;
        private bool canWrite = false;
        private bool canPurge = false;
        private bool canNamed = false;
        private nSessionAttributes attr = null;
        private string channelName = null;
        private nRealmNode node = null;
        private nACL acl = null;
        private string[] changeArgs = null;

        ///  
        ///   <summary> * Construct an instance of this class using the command line arguments passed
        ///   * when it is executed. </summary>
        ///   
        public modchanacl(string[] args)
        {
            try
            {
                changeArgs = args;
                // set the parameters required for this operation
                getOptions(changeArgs);
                Console.WriteLine("Connecting to " + realm);
                // construct the session attributes from the realm
                attr = new nSessionAttributes(realm);
                // get the root realm node from the realm admin
                node = new nRealmNode(attr);
                if (!node.isAuthorised())
                {
                    Console.WriteLine("User not authorised on this node " + realm);
                    return;
                }

                // wait for the entire node namespace to be constructed if
                // the operation is recursive
                Console.Write("waiting for namepsace construction..... ");
                node.waitForEntireNameSpace();
                Console.WriteLine("finished");
                // call the method to search from the root realm node
                searchNode(node);
                // close the realm node which will close all connections to child nodes
                node.close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        ///  
        ///   <summary> * set the permissions on the channel </summary>
        ///   
        public virtual void setChannel(nLeafNode p_leaf)
        {
            try
            {
                // get the acl for the channel node
                acl = p_leaf.getACLs();
                Console.WriteLine("Creating new entry for " + name + "@" + host);
                // create a new acl entry with the name and host
                nChannelACLEntry lookup = (nChannelACLEntry)acl.find(name + "@" + host);
                // set the current permissions from the acl entry
                setCurrent(lookup);
                Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                Console.WriteLine("Current ACL Settings for " + p_leaf.Name + " on realm " + node.Name);
                Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                dump(lookup);
                // now set those which have changed
                setChanges();
                // change the entry in the acl
                p_leaf.modACLEntry(changeACLEntry(lookup));
                // set the node acl to the new acl list
                Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                Console.WriteLine("New ACL Settings for " + p_leaf.Name + " on realm " + node.Name);
                Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                dump(lookup);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        ///  
        ///   <summary> * search the enumeration of child nodes for other realms and channels </summary>
        ///   
        private void searchNodes(System.Collections.IEnumerator enum1)
        {
            while (enum1.MoveNext())
            {
                object obj = enum1.Current;
                if (obj is nLeafNode)
                {
                    nLeafNode leaf = (nLeafNode)obj;
                    string fullyQualifiedName = leaf.getAbsolutePath();
                    Console.WriteLine("Found channel " + fullyQualifiedName);
                    if (pattern)
                    {
                        if ((leaf.isChannel()) && (fullyQualifiedName.IndexOf(channelName) != -1))
                        {
                            // we have found a channel that matches the name specified, so set the permissions
                            setChannel(leaf);
                            return;
                        }
                    }
                    else if (factory)
                    {
                        if ((leaf.isChannel()) && (fullyQualifiedName.StartsWith(channelName)))
                        {
                            // we have found a channel that matches the name specified, so set the permissions
                            setChannel(leaf);
                            return;
                        }
                    }
                    else if ((leaf.isChannel()) && (fullyQualifiedName.Equals(channelName)))
                    {
                        // we have found a channel that matches the name specified, so set the permissions
                        setChannel(leaf);
                        return;
                    }
                }
                else if (obj is nRealmNode)
                {
                    // we have found another realm node, so search this node for channels
                    searchNode((nRealmNode)obj);
                }
                else if (obj is nContainer)
                {
                    nContainer cont = (nContainer)obj;
                    searchNodes(cont.getNodes());
                }
            }
        }

        ///  
        ///   <summary> * Search the children of the realm passed as a paremeter </summary>
        ///   
        private void searchNode(nRealmNode p_node)
        {
            try
            {
                Console.WriteLine("Found node " + p_node.Name);
                searchNodes(p_node.getNodes());
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        ///  
        ///   <summary> * Change an acl entry and set the permissions based on the permissions flags </summary>
        ///   
        public virtual nChannelACLEntry changeACLEntry(nChannelACLEntry aclEntry)
        {
            return this.setPermissions(aclEntry);
        }

        ///  
        ///   <summary> * If you construct an instance of this class from another class, you can set the name
        ///   * and host for the subject. </summary>
        ///   
        public virtual void setSubject(string p_name, string p_host)
        {
            name = p_name;
            host = p_host;
        }

        ///  
        ///   <summary> * This will set the permissions flags to what the current acl settings are
        ///   *
        ///   * This is so that only those permissions that you wish to change are changed </summary>
        ///   
        public virtual void setCurrent(nChannelACLEntry entry)
        {
            canListAcl = entry.canList();
            canModifyAcl = entry.canModify();
            fullPrivileges = entry.hasFullPrivileges();
            canGetLastEid = entry.canGetLastEID();
            canRead = entry.canRead();
            canWrite = entry.canWrite();
            canPurge = entry.canPurge();
            canNamed = entry.canUseNamedSubscription();
        }

        ///  
        ///   <summary> * Set the permissions on the channel acl entry </summary>
        ///   
        public virtual nChannelACLEntry setPermissions(nChannelACLEntry aclEntry)
        {
            aclEntry.setList(canListAcl);
            aclEntry.setModify(canModifyAcl);
            aclEntry.setFullPrivileges(fullPrivileges);
            aclEntry.setGetLastEID(canGetLastEid);
            aclEntry.setRead(canRead);
            aclEntry.setWrite(canWrite);
            aclEntry.setPurge(canPurge);
            aclEntry.setUseNamedSubscription(canNamed);
            return aclEntry;
        }

        ///  
        ///   <summary> * Output to system.out the permissions the current permissions on the acl entry </summary>
        ///   
        public virtual void dump(nChannelACLEntry entry)
        {
            Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
            Console.WriteLine("List ACL               : " + entry.canList());
            Console.WriteLine("Set ACL                : " + entry.canModify());
            Console.WriteLine("Full Privileges        : " + entry.hasFullPrivileges());
            Console.WriteLine("Get Last EID           : " + entry.canGetLastEID());
            Console.WriteLine("Read channel           : " + entry.canRead());
            Console.WriteLine("Write to channel       : " + entry.canWrite());
            Console.WriteLine("Purge channel          : " + entry.canPurge());
            Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        }

        ///  
        ///   <summary> * Output to system.out the permissions that will be set </summary>
        ///   
        public virtual void dump()
        {
            Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
            Console.WriteLine("ACL will be set to.... ");
            Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
            Console.WriteLine("List ACL               : " + canListAcl);
            Console.WriteLine("Set ACL                : " + canModifyAcl);
            Console.WriteLine("Full Privileges        : " + fullPrivileges);
            Console.WriteLine("Get Last EID           : " + canGetLastEid);
            Console.WriteLine("Read channel           : " + canRead);
            Console.WriteLine("Write to channel       : " + canWrite);
            Console.WriteLine("Purge channel          : " + canPurge);
            Console.WriteLine("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        }

        ///  
        ///   <summary> * Set the program variables and flags based on command line args </summary>
        ///   
        public virtual void getOptions(string[] args)
        {
            if (args == null || args.Length == 0)
            {
                Usage();
                System.Environment.Exit(1);
            }
            realm = args[0];
            if (realm == null)
            {
                Usage();
                System.Environment.Exit(1);
            }
            name = args[1];
            if (name == null)
            {
                Usage();
                System.Environment.Exit(1);
            }
            else if (name.Equals(everyone))
            {
                name = "*";
            }
            host = args[2];
            if (host == null)
            {
                Usage();
                System.Environment.Exit(1);
            }
            else if (host.Equals(everywhere))
            {
                host = "*";
            }
            channelName = args[3];
            if (channelName == null)
            {
                Usage();
                System.Environment.Exit(1);
            }
            if (channelName.IndexOf("%") != -1)
            {
                if (channelName.StartsWith("%") && channelName.EndsWith("%"))
                {
                    channelName = channelName.Substring(1);
                    channelName = channelName.Substring(0, channelName.Length - 1);
                    pattern = true;
                }
                if (channelName.EndsWith("%"))
                {
                    channelName = channelName.Substring(0, channelName.Length - 1);
                    factory = true;
                }
            }
        }

        ///  
        ///   <summary> * This method will set the permissions flags, if the command line arguments have been
        ///   * passed for specific permissions.
        ///   *
        ///   * The command line arguments are + or - for either add or remove permission, followed
        ///   * by the actual permission flag </summary>
        ///   
        public virtual void setChanges()
        {
            for (int i = 0; i < changeArgs.Length; i++)
            {
                bool hasPermission;
                if (changeArgs[i].StartsWith("+"))
                {
                    hasPermission = true;
                }
                else if (changeArgs[i].StartsWith("-"))
                {
                    hasPermission = false;
                }
                else
                {
                    continue;
                }
                string permission = changeArgs[i].Substring(1);
                Console.WriteLine("operation " + hasPermission + " for permission " + permission);
                if (permission.Equals("list_acl"))
                {
                    canListAcl = hasPermission;
                }
                else if (permission.Equals("modify_acl"))
                {
                    canModifyAcl = hasPermission;
                }
                else if (permission.Equals("full"))
                {
                    fullPrivileges = hasPermission;
                }
                else if (permission.Equals("read"))
                {
                    canRead = hasPermission;
                }
                else if (permission.Equals("write"))
                {
                    canWrite = hasPermission;
                }
                else if (permission.Equals("purge"))
                {
                    canPurge = hasPermission;
                }
                else if (permission.Equals("named"))
                {
                    canNamed = hasPermission;
                }
                else if (permission.Equals("all_perms"))
                {
                    canListAcl = hasPermission;
                    canModifyAcl = hasPermission;
                    canGetLastEid = hasPermission;
                    canRead = hasPermission;
                    canWrite = hasPermission;
                    canPurge = hasPermission;
                    canNamed = hasPermission;
                }
            }
        }


        ///  
        ///   <summary> * Run this as a command line program passing the command line args.
        ///   *
        ///   * Or construct one of these classes from another class ensuring you have added :
        ///   *
        ///   *    RNAME
        ///   *    NAME
        ///   *    HOST
        ///   *    CHANNEL
        ///   *
        ///   * as system properties, and pass in a list of permissions in the constructor
        ///   * </summary>
        ///   
        static void Main(string[] args)
        {
            modchanacl setAcl = new modchanacl(args);
            System.Environment.Exit(0);
        }

        ///  
        ///   <summary> * Prints the usage message for this class </summary>
        ///   
        private static void Usage()
        {

            Console.WriteLine("Usage ...\n");
            Console.WriteLine("nchangechanacl <rname> <user> <host> <channel name> [+/-list_acl] [+/-modify_acl] [+/-full] [+/-last_eid] [+/-read] [+/-write] [+/-purge] [+/-named] [+/-all_perms]\n");
            Console.WriteLine("<Required Arguments> \n");
            Console.WriteLine("<rname> - the rname of the server to connect to");
            Console.WriteLine("<user> - User name parameter for the channel to change the ACL entry for");
            Console.WriteLine("<host> - Host name parameter for the channel to change the ACL entry for");
            Console.WriteLine("<channel name> - Channel name parameter for the channel to change the ACL entry for");
            Console.WriteLine("\n[Optional Arguments] \n");
            Console.WriteLine("[+/-] - Prepending + or - specifies whether to add or remove a permission");
            Console.WriteLine("[list_acl] - Specifies that the list acl permission should be added/removed");
            Console.WriteLine("[modify_acl] - Specifies that the modify acl permission should be added/removed");
            Console.WriteLine("[full] - Specifies that the full permission should be added/removed");
            Console.WriteLine("[last_eid] - Specifies that the get last EID permission should be added/removed");
            Console.WriteLine("[read] - Specifies that the read permission should be added/removed");
            Console.WriteLine("[write] - Specifies that the write permission should be added/removed");
            Console.WriteLine("[purge] - Specifies that the purge permission should be added/removed");
            Console.WriteLine("[named] - Specifies that the used named subscriber permission should be added/removed");
            Console.WriteLine("[all_perms] - Specifies that all permissions should be added/removed");
        }


    }

}