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 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 */

using System;
using System.Collections.Generic;
using System.IO;
using XenAPI;


namespace XenAdmin.Actions
{
    public class CheckDiskSpaceForPatchUploadAction : PureAsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private readonly string fileName;
        private readonly long fileSize;

       

        /// <summary>
        /// This constructor is used to check disk space for uploading a single patch
        /// </summary>
        public CheckDiskSpaceForPatchUploadAction(Host host, Pool_patch patch, bool suppressHistory)
            : this(host, patch.Name, patch.size, suppressHistory)
        { }

        /// <summary>
        /// This constructor is used to check disk space for uploading a single update file
        /// </summary>
        public CheckDiskSpaceForPatchUploadAction(Host host, string path, bool suppressHistory)
            : this(host, FileName(path), FileSize(path), suppressHistory)
        { }

        /// <summary>
        /// This constructor is used to check disk space for uploading a file of given size
        /// </summary>
        public CheckDiskSpaceForPatchUploadAction(Host host, string fileName, long size, bool suppressHistory)
            : base(host.Connection, Messages.ACTION_CHECK_DISK_SPACE_TITLE, "", suppressHistory)
        {
            if (host == null)
                throw new ArgumentNullException("host");
            Host = host;
            this.fileName = fileName;
            fileSize = size;
        }

        private static long FileSize(string path)
        {
            FileInfo fileInfo = new FileInfo(path);
            return fileInfo.Length;
        }

        private static string FileName(string path)
        {
            FileInfo fileInfo = new FileInfo(path);
            return fileInfo.Name;
        }

        protected override void Run()
        {
            SafeToExit = false;
            Description = String.Format(Messages.ACTION_CHECK_DISK_SPACE_DESCRIPTION, Host.Name);
            if (!IsEnoughDiskSpace())
            {
                DiskSpaceRequirements diskSpaceRequirements = null;
                var getDiskSpaceRequirementsAction = new GetDiskSpaceRequirementsAction(Host, fileName, fileSize, true);
                try
                {
                    getDiskSpaceRequirementsAction.RunExternal(Session);
                    diskSpaceRequirements = getDiskSpaceRequirementsAction.DiskSpaceRequirements;
                }
                catch (Failure failure)
                {
                    log.WarnFormat("Getting disk space requirements on {0} failed with: {1}", Host.Name, failure.Message);
                }
                Exception = new NotEnoughSpaceException(Host.Name, fileName, diskSpaceRequirements);
            }
        }

        private bool IsEnoughDiskSpace()
        {
            string result;
            try
            {
                result = Host.call_plugin(Session, Host.opaque_ref, "disk-space", "check_patch_upload", 
                    new Dictionary<string, string> { { "size", fileSize.ToString() } });
            }
            catch (Failure failure)
            {
                log.WarnFormat("Plugin call disk-space.check_patch_upload({0}) on {1} failed with {2}", fileSize, Host.Name,
                               failure.Message);
                return true;
            }
            return result.ToLower() == "true";
        }
    }

    public class NotEnoughSpaceException : Exception
    {
        private readonly string host;
        private readonly string fileName;

        public DiskSpaceRequirements DiskSpaceRequirements { get; private set; }

        public NotEnoughSpaceException(string host, string fileName)
        {
            this.host = host;
            this.fileName = fileName;
            DiskSpaceRequirements = null;
        }

        public NotEnoughSpaceException(string host, string fileName, DiskSpaceRequirements diskSpaceRequirements)
        {
            this.host = host;
            this.fileName = fileName;
            DiskSpaceRequirements = diskSpaceRequirements;
        }

        public override string Message
        {
            get { return String.Format(Messages.NOT_ENOUGH_SPACE_MESSAGE_UPLOAD, host, fileName); }
        }
    }
}