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using System;
using System.Collections.Generic;
using System.Linq;
using XenAPI;

namespace XenAdmin.Diagnostics.Hotfixing
{
    internal class MultipleHotfix : Hotfix
    {
        public List<Hotfix> ComponentHotfixes { get; set; }

        /// <summary>
        /// Concatenated string of sorted UUIDs separated with a ";"
        /// Use String.Contains() to look up if the individual UUID is present
        /// </summary>
        public override string UUID
        {
            get
            {
                List<string> uuids = ComponentHotfixes.Select(hotfix => hotfix.UUID).ToList();
                uuids.Sort();
                return String.Join(";", uuids.ToArray());
            }
            set { throw new NotImplementedException("Multiple hotfix string does not implement a setter"); }
        }

        /// <summary>
        /// Concatenated string of sorted file names separated with a ";"
        /// Use String.Contains() to look up if the individual file name is present
        /// </summary>
        public override string Filename
        {
            get
            {
                List<string> filenames = ComponentHotfixes.Select(h => h.Filename).ToList();
                filenames.Sort();
                return String.Join(";", filenames.ToArray());
            }
            set { throw new NotImplementedException("Multiple hotfix string does not implement a setter"); }
        }

        public sealed override void Apply(Host host, Session session)
        {
            foreach (Hotfix hotfix in ComponentHotfixes)
            {
                if(hotfix.ShouldBeAppliedTo(host))
                    hotfix.Apply(host, session);
            }
        }

        public override bool ShouldBeAppliedTo(Host host)
        {
            return ComponentHotfixes.Any(hf => hf.ShouldBeAppliedTo(host));
        }
    }
}