using System;
using System.Collections;
using System.Reflection;
using CLre.API.Utility;
using HarmonyLib;
using Svelto.DataStructures;
using Svelto.ECS;

namespace CLre.Fixes
{
    [Bugfix(name = "CooldownCrossSlotSync",
        more = "https://trello.com/c/65FPrTjK/12-no-cooldown-between-inventory-slots",
        description = "Apply cooldown to all weapons",
        component = BugfixType.HarmonyPatch, id = 4)]
    [HarmonyPatch]
    class WeaponCooldownEngine_OnQuickAttackStateChange_Patch
    {
        public static bool Enable = true;

        private static bool isRunningTick = false;

        [HarmonyPostfix]
        public static void AfterMethodCall(object __instance, int characterId, bool isPerformingQuickAttack)
        {
            if (!Enable) return;
            // TODO optimise this... a lot
            // build functions for retrieving internal Game.Handhelds.CharacterWeaponCooldownEntityView object
            IEntitiesDB entitiesDB = (IEntitiesDB)
                AccessTools.PropertyGetter(AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEngine"), "entitiesDB")
                    .Invoke(__instance, new object[0]);
            Reflection.ExistsV2 cwcevExists =
                Reflection.MethodAsDelegate<Reflection.ExistsV2>(
                    "Svelto.ECS.IEntitiesDB:Exists",
                    new[] {typeof(int), typeof(int)},
                    new[] {AccessTools.TypeByName("Game.Handhelds.CharacterWeaponCooldownEntityView")},
                    entitiesDB);
            Reflection.QueryEntityViewV2<object> queryCWCEV =
                Reflection.MethodAsDelegate<Reflection.QueryEntityViewV2<object>>(
                    typeof(IEntitiesDB),
                    "QueryEntityView",
                    parameters: new[] {typeof(int), typeof(ExclusiveGroup.ExclusiveGroupStruct)},
                    generics: new[] {AccessTools.TypeByName("Game.Handhelds.CharacterWeaponCooldownEntityView")},
                    entitiesDB);
            // retrieve Game.Handhelds.CharacterWeaponCooldownEntityView
            if (!cwcevExists(characterId, (int) DEPRECATED_SveltoExtensions.DEPRECATED_GROUP))
            {
                //API.Utility.Logging.MetaDebugLog($"No CharacterWeaponCooldownEntityView with id {characterId} found");
                return;
            }

            object cwcevOriginal = queryCWCEV(characterId,
                (ExclusiveGroup.ExclusiveGroupStruct) DEPRECATED_SveltoExtensions.DEPRECATED_GROUP);
            // get id because that's important
            int toolId = Traverse.Create(cwcevOriginal).Field("handheldEquipmentComponent")
                .Property("equippedHandheldId")
                .GetValue<DispatchOnChange<int>>().value;
            //API.Utility.Logging.MetaLog("Got CharacterWeaponCooldownEntityView object using nasty code");
            // build functions for retrieving internal Game.Handhelds.WeaponCooldownEntityView object
            Reflection.ExistsV2 wcevExists =
                Reflection.MethodAsDelegate<Reflection.ExistsV2>(
                    "Svelto.ECS.IEntitiesDB:Exists",
                    new[] {typeof(int), typeof(int)},
                    new[] {AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEntityView")},
                    entitiesDB);
            Reflection.QueryEntityViewV2<object> queryWCEV =
                Reflection.MethodAsDelegate<Reflection.QueryEntityViewV2<object>>(
                    typeof(IEntitiesDB),
                    "QueryEntityView",
                    parameters: new[] {typeof(int), typeof(ExclusiveGroup.ExclusiveGroupStruct)},
                    generics: new[] {AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEntityView")},
                    entitiesDB);
            ExclusiveGroup baseGroup = (ExclusiveGroup) AccessTools
                .Field(AccessTools.TypeByName("Game.Handhelds.HandheldGroups"), "BaseGroup").GetValue(null);
            // retrieve WeaponCooldownEntityView
            if (!wcevExists(toolId, (int) baseGroup))
            {
                //API.Utility.Logging.MetaDebugLog($"No WeaponCooldownEntityView with id {toolId} found");
                return;
            }

            //object wcevOriginal = queryWCEV(toolId, baseGroup);
            //API.Utility.Logging.MetaLog($"Cooling down? {isInCooldown} for {cooldownLeft}s");
            // build functions for querying all Game.Handhelds.WeaponCooldownEntityView objects
            Type protoRaw =
                typeof(Reflection.QueryEntityViews<>)
                    .MakeGenericType(
                    AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEntityView"));
            Delegate queryAllWCEV =
                Reflection.MethodAsDelegateRaw(
                    typeof(IEntitiesDB),
                    protoRaw,
                    "QueryEntityViews",
                    parameters: new[] {typeof(int)},
                    generics: new[] {AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEntityView")},
                    entitiesDB);
            object collectionStruct =
                queryAllWCEV.DynamicInvoke((int) baseGroup);
            int count = Traverse.Create(collectionStruct).Field<int>("_count").Value;
            PropertyInfo indexer = typeof(Svelto.DataStructures.ReadOnlyCollectionStruct<>)
                .MakeGenericType(AccessTools.TypeByName("Game.Handhelds.WeaponCooldownEntityView"))
                .GetIndexer();
            
            if (!isRunningTick)
            {
                isRunningTick = true;
                cooldownTickEverything(characterId, cwcevExists, queryCWCEV, queryWCEV, queryAllWCEV, indexer, baseGroup).Run();
            }
        }

        [HarmonyTargetMethod]
        public static MethodBase Target()
        {
            return AccessTools.Method("Game.Handhelds.WeaponCooldownEngine:OnQuickAttackStateChange",
                new[] {typeof(int), typeof(bool)});
        }

        private static IEnumerator cooldownTickEverything(int characterId, Reflection.ExistsV2 cwcevExists, Reflection.QueryEntityViewV2<object> cwcevQuery, Reflection.QueryEntityViewV2<object> wcevQuery, Delegate wcevQueryAll, PropertyInfo indexer, ExclusiveGroup baseGroup)
        {
            while (cwcevExists(characterId, (int) DEPRECATED_SveltoExtensions.DEPRECATED_GROUP))
            {
                // get equipped handheld info
                object cwcevOriginal = cwcevQuery(characterId,
                    (ExclusiveGroup.ExclusiveGroupStruct) DEPRECATED_SveltoExtensions.DEPRECATED_GROUP);
                int toolId = Traverse.Create(cwcevOriginal).Field("handheldEquipmentComponent")
                    .Property("equippedHandheldId")
                    .GetValue<DispatchOnChange<int>>().value;
                // get cooldown info for equipped item
                object wcevOriginal = wcevQuery(toolId, baseGroup);
                object collectionStruct =
                    wcevQueryAll.DynamicInvoke((int)baseGroup);
                int count = Traverse.Create(collectionStruct).Field<int>("_count").Value;
                float cooldownLeft =
                    Traverse.Create(wcevOriginal).Field("weaponCooldownComponent").Property<float>("cooldownLeft").Value;
                bool isInCooldown = 
                    Traverse.Create(wcevOriginal).Field("weaponCooldownComponent").Property<bool>("isInCooldown").Value;
                object[] indexParams = {0};
                // iterate over other handhelds and sync their cooldowns to the held item
#if DEBUG
                API.Utility.Logging.MetaDebugLog($"Syncing {count} weapon cooldowns with the held item {toolId}");
#endif
                for (int index = 0; index < count; index++)
                {
                    indexParams[0] = index;
                    object wcev = indexer.GetValue(collectionStruct, indexParams);
                    Traverse.Create(wcev)
                        .Field("weaponCooldownComponent")
                        .Property<float>("cooldownLeft")
                        .Value = cooldownLeft;
                
                    Traverse.Create(wcev)
                        .Field("weaponCooldownComponent")
                        .Property<bool>("isInCooldown").Value = isInCooldown;
                }
                // stop running this task after one final sync to set every handheld to non-cooldown state
                if (!isInCooldown && cooldownLeft <= 0) break;
                yield return null;
            }
            // cleanup
#if DEBUG
            API.Utility.Logging.MetaDebugLog("Custom cooldown ticks complete");
#endif
            isRunningTick = false;
            yield return null;
        }
    }
}