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using System.Linq;
using XenAdmin.Core;
using XenAdmin.Diagnostics.Problems;
using XenAdmin.Diagnostics.Problems.VMProblem;
using XenAdmin.Diagnostics.Problems.PoolProblem;
using XenAPI;

namespace XenAdmin.Diagnostics.Checks
{
    class AssertCanEvacuateUpgradeCheck : AssertCanEvacuateCheck
    {
        public AssertCanEvacuateUpgradeCheck(Host host)
            : base(host)
        {
        }

        protected override Problem RunHostCheck()
        {
            // check if the pool has incompatible CPUs
            Pool pool = Helpers.GetPoolOfOne(Host.Connection);
            if (pool != null && PoolHasCpuIncompatibilityProblem(pool))
            {
                if (Host.IsCoordinator())
                    return new CPUIncompatibilityProblem(this, pool);
                return new CPUCIncompatibilityWarning(this, pool, Host);
            }

            //vCPU configuration check
            foreach (var vm in Host.Connection.Cache.VMs.Where(vm => vm.is_a_real_vm()))
            {
                if (!vm.HasValidVCPUConfiguration())
                    return new InvalidVCPUConfiguration(this, vm);
            }

            return base.RunHostCheck();
        }

        private bool PoolHasCpuIncompatibilityProblem(Pool pool)
        {
            if (pool == null)
                return false;

            if (!pool.Connection.Cache.VMs.Any(vm => vm.is_a_real_vm() && vm.power_state != vm_power_state.Halted))
                return false;

            foreach (var host1 in pool.Connection.Cache.Hosts)
            {
                foreach (var host2 in pool.Connection.Cache.Hosts.Where(h => h.uuid != host1.uuid))
                {
                    if (!PoolJoinRules.CompatibleCPUs(host1, host2, false))
                        return true;
                }
            }
            return false;

        }
    }
}