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using System;
using System.Collections.Generic;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAPI;
using System.Linq;
using System.IO;
using XenAdmin.Network;
using XenAdmin.Diagnostics.Checks;
using System.Diagnostics;

namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    class PatchPrechecksOnMultipleHostsInAPoolPlanAction : PlanActionWithSession
    {
        private readonly XenServerPatch patch;
        private readonly List<PoolPatchMapping> mappings;
        private List<Host> hosts = null;

        public PatchPrechecksOnMultipleHostsInAPoolPlanAction(IXenConnection connection, XenServerPatch patch, List<Host> hosts, List<PoolPatchMapping> mappings)
            : base(connection, string.Format(Messages.UPDATES_WIZARD_RUNNING_PRECHECK, patch.Name, connection.Name))
        {
            this.patch = patch;
            this.hosts = hosts;
            this.mappings = mappings;
        }

        protected override void RunWithSession(ref Session session)
        {
            var master = Helpers.GetMaster(Connection);
            var mapping = mappings.Find(m => m.XenServerPatch.Equals(patch) && m.MasterHost != null && master != null && m.MasterHost.uuid == master.uuid);

            if (mapping != null && (mapping.Pool_patch != null || mapping.Pool_update != null))
            {
                foreach (var host in hosts)
                {
                    if (Cancelling)
                    {
                        throw new CancelledException();
                    }

                    try
                    {
                        PatchPrecheckCheck check = null;

                        if (mapping.Pool_patch != null)
                        {
                            check = new PatchPrecheckCheck(host, mapping.Pool_patch);
                        }
                        else
                        {
                            check = new PatchPrecheckCheck(host, mapping.Pool_update);
                        }

                        var problems = check.RunAllChecks();

                        Diagnostics.Problems.Problem problem = null;

                        if (problems != null && problems.Count > 0)
                            problem = problems[0];

                        if (problem != null)
                        {
                            throw new Exception(string.Format("{0}: {1}. {2}", host, problem.Title, problem.Description));
                        }
                    }
                    catch (Exception ex)
                    {
                        log.Error(string.Format("Precheck failed on host {0}", host.Name()), ex);
                        throw ex;
                    }
                }
            }

        }
    }
}