using AssortValidator.Common.Helpers;
using static AssortUpdater.AssortFlattener;

namespace AssortUpdater
{
    public static class AssortMerger
    {
        public static List<FlatAssort> CreateMergedFlattenedAssorts(string trader, List<FlatAssort> flattenedLiveAssorts, List<FlatAssort> flattenedExistingAssorts)
        {
            var completeAssorts = new List<FlatAssort>();

            // Add live assorts to merged list
            foreach (var liveAssort in flattenedLiveAssorts)
            {
                completeAssorts.Add(liveAssort);
            }
            LoggingHelpers.LogSuccess($"{trader} Added {flattenedLiveAssorts.Count} items from live");
            LoggingHelpers.LogNewLine();

            // Check for missing existing assorts and add those
            var ExistingItemCount = 0;
            foreach (var existingAssort in flattenedExistingAssorts)
            {
                var matchInCompleteAssorts = GetMatchingAssortFromCompleteList(trader, existingAssort, completeAssorts);
                if (matchInCompleteAssorts != null)
                {
                    // Match found, dont add dupe item
                    continue;
                }

                // no assort found, add
                LoggingHelpers.LogWarning($"{trader} Adding Item found in existing assorts but not live: {existingAssort.ItemId} {existingAssort.ItemName} Level: {existingAssort.Level}");
                completeAssorts.Add(existingAssort);
                ExistingItemCount++;
            }

            LoggingHelpers.LogNewLine();
            LoggingHelpers.LogSuccess($"{trader} Added {ExistingItemCount} existing items");
            return completeAssorts;
        }

        private static FlatAssort? GetMatchingAssortFromCompleteList(string traderName, FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            IEnumerable<FlatAssort>? existingAssort = GetAssortByItemId(assortToFind, completeAssorts);
            if (existingAssort.Any() && existingAssort.Count() == 1)
            {
                // one match found by id, dont add
                return existingAssort.First();
            }

            existingAssort = GetAssortByItemIdAndLevel(assortToFind, completeAssorts);

            if (SingleAssortFound(existingAssort))
            {
                //LoggingHelpers.LogSuccess($"{traderName} match found for item: {assortToFind.ItemId} {assortToFind.ItemName} Level: {assortToFind.Level}");
                return existingAssort.First();
            }

            if (MultipleAssortsFound(existingAssort))
            {
                // Multiple matches found, be more specific
                existingAssort = GetAssortByItemIdLevelAndMoney(assortToFind, completeAssorts);

                if (SingleAssortFound(existingAssort))
                {
                    return existingAssort.First();
                }
                if (MultipleAssortsFound(existingAssort))
                {
                    // Multiple matches found, be more specific...again
                    existingAssort = GetAssortByItemIdLevelMoneySubItemCountAndCostItemCount(assortToFind, completeAssorts);

                    if (SingleAssortFound(existingAssort))
                    {
                        return existingAssort.First();
                    }
                }
            }

            existingAssort = GetAssortByBarterCostAndCount(assortToFind, completeAssorts);
            if (SingleAssortFound(existingAssort))
            {
                return existingAssort.First();
            }


            //LoggingHelpers.LogError($"{traderName} No match found for item: {assortToFind.ItemId} {assortToFind.ItemName} Level: {assortToFind.Level}");
            // No matches found, probably doesnt exist
            return null;
        }

        private static bool SingleAssortFound(IEnumerable<FlatAssort> existingAssort)
        {
            return existingAssort?.Count() == 1;
        }

        private static bool MultipleAssortsFound(IEnumerable<FlatAssort>? existingAssort)
        {
            return existingAssort?.Count() > 1;
        }

        private static IEnumerable<FlatAssort> GetAssortByItemIdLevelMoneySubItemCountAndCostItemCount(FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            return completeAssorts.Where(x => x.ItemId == assortToFind.ItemId
                                               && x.Level == assortToFind.Level
                                               && x.IsMoney == assortToFind.IsMoney
                                               && x.SubItems.Count == assortToFind.SubItems.Count
                                               && x.BarterDetails[0].count == assortToFind.BarterDetails[0].count);
        }

        private static IEnumerable<FlatAssort> GetAssortByItemId(FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            return completeAssorts.Where(x => x.ItemId == assortToFind.ItemId);
        }

        private static IEnumerable<FlatAssort> GetAssortByItemIdAndLevel(FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            return completeAssorts.Where(x => x.ItemId == assortToFind.ItemId
                                                          && x.Level == assortToFind.Level);
        }

        private static IEnumerable<FlatAssort> GetAssortByItemIdLevelAndMoney(FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            return completeAssorts.Where(x => x.ItemId == assortToFind.ItemId
                                                   && x.Level == assortToFind.Level
                                                   && x.IsMoney == assortToFind.IsMoney);
        }

        private static IEnumerable<FlatAssort>? GetAssortByBarterCostAndCount(FlatAssort assortToFind, List<FlatAssort> completeAssorts)
        {
            var itemsThatHaveSameCost = completeAssorts.Where(x => x.ItemId == assortToFind.ItemId
                                                                && x.Level == assortToFind.Level);

            foreach (var item in itemsThatHaveSameCost)
            {
                var matches = 0;
                foreach (var barter in item.BarterDetails)
                {
                    var match = assortToFind.BarterDetails.Any(x => x._tpl == barter._tpl && x.count == barter.count);
                    if (match)
                    {
                        matches++;
                        // collection already has item
                    }
                }
                if (matches == assortToFind.BarterDetails.Count)
                {
                    //LoggingHelpers.LogSuccess($"{traderName} item found with same cost: {assortToFind.ItemId} {assortToFind.ItemName} Level: {assortToFind.Level}");
                    return new List<FlatAssort>() { item };
                }
            }

            return null;
        }

        public static void ListDuplicatesInMergedAssorts(List<FlatAssort> flatAssorts)
        {
            foreach (var item in flatAssorts)
            {
                var dupes = flatAssorts.Where(x => x.ItemId == item.ItemId && x.Level == item.Level && x.IsMoney == item.IsMoney && x.AssortId != item.AssortId);

                if (dupes.Any())
                {
                    LoggingHelpers.LogError($"{dupes.Count()} Dupes found for assort {item.AssortId} item: {item.ItemName} id:{item.ItemId} level: {item.Level} isMoney: {item.IsMoney}");
                    foreach (var dupeItem in dupes)
                    {
                        LoggingHelpers.LogError($"Dupe assort{dupeItem.AssortId}: {dupeItem.ItemId} - {dupeItem.ItemName} id:{item.ItemId} level: {dupeItem.Level} isMoney:{dupeItem.IsMoney}");
                    }
                }
            }
        }
    }
}