/* Copyright (c) Citrix Systems, Inc. 
 * All rights reserved. 
 * 
 * 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 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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 */

using System;
using System.Collections.Generic;
using XenAdmin.Diagnostics.Problems;
using XenAdmin.Diagnostics.Problems.HostProblem;
using XenAdmin.Diagnostics.Problems.SRProblem;
using XenAPI;


namespace XenAdmin.Diagnostics.Checks
{
    class PBDsPluggedCheck : HostPostLivenessCheck
    {
        SR srUploadedUpdates;

        public PBDsPluggedCheck(Host host, SR sr = null) : base(host)
        {
            srUploadedUpdates = sr;
        }

        public override List<Problem> RunAllChecks()
        {
            if (!Host.IsLive())
                return new List<Problem> {new HostNotLiveWarning(this, Host)};

            var list = new List<Problem>();

            foreach (VM vm in Host.Connection.Cache.VMs)
            {
                if (vm.power_state != vm_power_state.Running && vm.power_state != vm_power_state.Paused)
                    continue;

                foreach (var vbdRef in vm.VBDs)
                {
                    var vbd = Host.Connection.Resolve(vbdRef);
                    if (vbd == null)
                        continue;

                    VDI vdi = Host.Connection.Resolve(vbd.VDI);
                    if (vdi == null)
                        continue;

                    SR sr = Host.Connection.Resolve(vdi.SR);
                    if (sr == null)
                        continue;

                    if ((sr.shared && !sr.CanBeSeenFrom(Host)) ||
                        (!sr.shared && sr.GetStorageHost().Equals(Host) && !sr.CanBeSeenFrom(Host)))
                    {
                        var problem = new BrokenSR(this, sr, Host);
                        if (!list.Contains(problem))
                            list.Add(problem);
                    }
                }
            }

            if (srUploadedUpdates != null
                && ((srUploadedUpdates.shared && !srUploadedUpdates.CanBeSeenFrom(Host))
                    || (!srUploadedUpdates.shared && srUploadedUpdates.IsBroken())))
            {
                var problem = new BrokenSR(this, srUploadedUpdates, Host);
                if (!list.Contains(problem))
                    list.Add(problem);
            }

            return list;
        }

        protected override Problem RunHostCheck()
        {
            throw new NotImplementedException("This class overrides RunAllChecks instead.");
        }

        public override string Description
        {
            get { return Messages.PBDS_CHECK_DESCRIPTION; }
        }
    }
}