using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace CLre_server.Fixes
{
    [AttributeUsage(AttributeTargets.Class)]
    public class BugfixAttribute : Attribute
    {
        public string name { get; set; }
        public string description { get; set; }
        public Type target { get; set; }
        public string more { get; set; }
        public uint id { get; set; }
        public BugfixType component { get; set; }
    }

    public enum BugfixType : byte
    {
        Miscellaneous = 0x00,
        HarmonyPatch,
        Initialiser,
        Workaround,
        API,
        Debug
    }

    internal static class BugfixAttributeUtility
    {
        public static void LogBugfixes()
        {
            List<uint> keys = new List<uint>();
            Dictionary<uint, BugfixStruct> fixes = new Dictionary<uint, BugfixStruct>();
            foreach (Type t in Assembly.GetExecutingAssembly().GetTypes())
            {
                BugfixAttribute b = t.GetCustomAttribute<BugfixAttribute>(true);
                if (b != null)
                {
                    if (!fixes.ContainsKey(b.id))
                    {
                        BugfixStruct bugfixStruct = new BugfixStruct{id = b.id};
                        bugfixStruct.Merge(b);
                        fixes[b.id] = bugfixStruct;
                        keys.Add(b.id);
                    }
                    else
                    {
                        BugfixStruct bugfixStruct = fixes[b.id];
                        bugfixStruct.Merge(b);
                        fixes[b.id] = bugfixStruct;
                    }
                }
            }
            keys.Sort();
            //keys.Sort((u, u1) => u.CompareTo(u1));
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("Applying {0} CLre fixes\n", keys.Count);
            sb.AppendFormat("-----------------------------\n");
            foreach (uint i in keys)
            {
                sb.Append(fixes[i].ToString());
                sb.Append("\n");
            }
            sb.AppendFormat("-----------------------------\n");
            API.Utility.Logging.Log(sb.ToString());
        }

        private struct BugfixStruct
        {
            public string name;
            public string description;
            public Type target;
            public string more;
            public uint id;
            private uint total;
            private uint[] bugfixTypeCount;

            public void Merge(BugfixAttribute b)
            {
                if (name == null && b.name != null) name = b.name;
                if (description == null && b.description != null) description = b.description;
                if (target == null && b.target != null) target = b.target;
                if (more == null && b.more != null) more = b.more;
                total++;
                if (bugfixTypeCount == null) bugfixTypeCount = new uint[Enum.GetNames(typeof(BugfixType)).Length];
                bugfixTypeCount[(byte) b.component]++;
            }

            public override string ToString()
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendFormat(" {0}: ", name);
                if (more != null)
                {
                    sb.AppendFormat("[MORE: {0}] ", more);
                }
                else if (description != null)
                {
                    sb.Append(description);
                    sb.Append(" ");
                }

                if (target != null)
                {
                    sb.AppendFormat("[TARGET: {0}] ", target.FullName);
                }
                sb.AppendFormat("[ID: {0}] ", id);
                sb.AppendFormat("({0}M/{1}P/{2}I/{3}W/{4}A/{5}D/{6}T)",
                    bugfixTypeCount[(byte) BugfixType.Miscellaneous], bugfixTypeCount[(byte) BugfixType.HarmonyPatch],
                    bugfixTypeCount[(byte) BugfixType.Initialiser], bugfixTypeCount[(byte) BugfixType.Workaround],
                    bugfixTypeCount[(byte) BugfixType.API], bugfixTypeCount[(byte) BugfixType.Debug], total);
                return sb.ToString();
            }
        }
    }
}