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using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Diagnostics.Problems;
using XenAdmin.Diagnostics.Problems.HostProblem;

namespace XenAdmin.Diagnostics.Checks
{
    class HostNeedsRebootCheck : HostPostLivenessCheck
    {
        private readonly Dictionary<string, livepatch_status> livePatchCodesByHost;
        private readonly List<after_apply_guidance> patchGuidance;
        private readonly List<update_after_apply_guidance> updateGuidance;
        private readonly List<XenServerPatch> restartHostPatches;

        private string successfulCheckDescription;

        public HostNeedsRebootCheck(Host host, List<update_after_apply_guidance> guidance, Dictionary<string, livepatch_status> livePatchCodesByHost)
            : base(host)
        {
            this.livePatchCodesByHost = livePatchCodesByHost;
            updateGuidance = guidance;
        }

        public HostNeedsRebootCheck(Host host, List<after_apply_guidance> guidance, Dictionary<string, livepatch_status> livePatchCodesByHost)
            : base(host)
        {
            this.livePatchCodesByHost = livePatchCodesByHost;
            patchGuidance = guidance;
        }

        public HostNeedsRebootCheck(Host host, List<XenServerPatch> restartHostPatches)
            : base(host)
        {
            this.restartHostPatches = restartHostPatches;
        }

        public HostNeedsRebootCheck(Host host)
            : base(host)
        {
        }


        protected override Problem RunHostCheck()
        {
            if (Helpers.CloudOrGreater(Host) && livePatchCodesByHost == null)
                return new HostNeedsReboot(this, Host);

            var updateSequenceIsLivePatchable = restartHostPatches != null && restartHostPatches.Count > 0 &&
                                                restartHostPatches.All(p => p.ContainsLivepatch);
            var hostHasBeenLivePatched = livePatchCodesByHost != null && livePatchCodesByHost.ContainsKey(Host.uuid) &&
                                         livePatchCodesByHost[Host.uuid] == livepatch_status.ok_livepatch_complete;

            if (hostHasBeenLivePatched || updateSequenceIsLivePatchable)
            {
                var livePatchingRestricted = Helpers.FeatureForbidden(Host.Connection, Host.RestrictLivePatching);
                var livePatchingRDisabled = Helpers.GetPoolOfOne(Host.Connection)?.live_patching_disabled == true;

                if (livePatchingRestricted || livePatchingRDisabled)
                    return new HostNeedsReboot(this, Host, livePatchingRestricted, livePatchingRDisabled);
                
                successfulCheckDescription = string.Format(Messages.UPDATES_WIZARD_NO_REBOOT_NEEDED_LIVE_PATCH, Host);
                return null;
            }

            if (updateGuidance != null && updateGuidance.Contains(update_after_apply_guidance.restartHost) ||
                patchGuidance != null && patchGuidance.Contains(after_apply_guidance.restartHost) ||
                restartHostPatches != null && restartHostPatches.Count > 0)
            {
                return new HostNeedsReboot(this, Host);
            }

            successfulCheckDescription = string.Format(Messages.UPDATES_WIZARD_NO_REBOOT_NEEDED, Host);
            return null;
        }
        
        public override string Description => Messages.HOST_NEEDS_REBOOT_CHECK_DESCRIPTION;

        public override string SuccessfulCheckDescription => successfulCheckDescription;
    }
}