using System.Collections.Generic;
using GameFramework.DataTable;
using GeometryTD.DataTable;
using GeometryTD.Definition;
using GeometryTD.Factory;
using GeometryTD.UI;
using UnityEngine;
using UnityGameFramework.Runtime;
using Random = System.Random;

namespace GeometryTD.CustomComponent
{
    public sealed class InventoryGenerationComponent : GameFrameworkComponent
    {
        private readonly List<DRShopPrice> _shopPriceRows = new();
        private IDataTable<DRShopPrice> _shopPriceTable;
        private IDataTable<DROutGameDropPool> _dropPoolTable;
        private IDataTable<DRMuzzleComp> _muzzleCompTable;
        private IDataTable<DRBearingComp> _bearingCompTable;
        private IDataTable<DRBaseComp> _baseCompTable;
        private ShopGoodsBuilder _shopGoodsBuilder;
        private DropPoolRoller _dropPoolRoller;
        private RewardCandidateBuilder _rewardCandidateBuilder;
        private OutGameDropItemBuilder _outGameDropItemBuilder;

        public List<GoodsItemRawData> BuildShopGoods(int goodsCount, int runSeed = 0, int sequenceIndex = -1)
        {
            EnsureShopBuilder();
            return _shopGoodsBuilder.BuildGoods(goodsCount, runSeed, sequenceIndex);
        }

        public EnemyDropResult ResolveEnemyDrop(
            in EnemyDropContext context,
            int runSeed,
            int sequenceIndex,
            ref int nextDropOrdinal)
        {
            DREnemy enemy = context.Enemy;
            if (enemy == null)
            {
                return EnemyDropResult.Empty;
            }

            int coin = Mathf.Max(0, enemy.DropCoin);
            int gold = 0;
            float dropRate = enemy.DropPercent > 1f
                ? Mathf.Clamp01(enemy.DropPercent * 0.01f)
                : Mathf.Clamp01(enemy.DropPercent);

            int dropOrdinal = nextDropOrdinal;
            nextDropOrdinal++;
            InventoryGenerationRandomContext randomContext =
                new(runSeed, sequenceIndex, InventoryTagSourceType.Drop, dropOrdinal);
            Random random = randomContext.CreateRandom();

            if (enemy.DropGold > 0 && dropRate > 0f && random.NextDouble() <= dropRate)
            {
                gold = Mathf.Max(0, enemy.DropGold);
            }

            TowerCompItemData lootItem = null;
            if (OutGameDropRuleService.ShouldRollOutGameItem(context.DisplayPhaseIndex, random) &&
                TryRollOutGameItem(
                    context.DisplayPhaseIndex,
                    context.ThemeType,
                    randomContext,
                    random,
                    out TowerCompItemData droppedItem))
            {
                lootItem = droppedItem;
            }

            return new EnemyDropResult(coin, gold, lootItem);
        }

        public IReadOnlyList<TowerCompItemData> BuildRewardCandidates(
            int displayPhaseIndex,
            LevelThemeType themeType,
            int candidateCount,
            int runSeed,
            int sequenceIndex,
            ref int nextRewardOrdinal)
        {
            RewardCandidateBuilder rewardCandidateBuilder = EnsureRewardCandidateBuilder();
            int rewardOrdinal = nextRewardOrdinal;
            IReadOnlyList<TowerCompItemData> candidates = rewardCandidateBuilder.BuildCandidates(
                displayPhaseIndex,
                themeType,
                candidateCount,
                CreateNextRewardRandomContext,
                BuildRewardCandidateItem);
            nextRewardOrdinal = rewardOrdinal;
            return candidates;

            InventoryGenerationRandomContext CreateNextRewardRandomContext()
            {
                return new InventoryGenerationRandomContext(
                    runSeed,
                    sequenceIndex,
                    InventoryTagSourceType.Reward,
                    rewardOrdinal++);
            }
        }

        private void EnsureShopTables()
        {
            _shopPriceTable ??= GameEntry.DataTable.GetDataTable<DRShopPrice>();
            _muzzleCompTable ??= GameEntry.DataTable.GetDataTable<DRMuzzleComp>();
            _bearingCompTable ??= GameEntry.DataTable.GetDataTable<DRBearingComp>();
            _baseCompTable ??= GameEntry.DataTable.GetDataTable<DRBaseComp>();

            if (_shopPriceTable == null || _muzzleCompTable == null || _bearingCompTable == null ||
                _baseCompTable == null)
            {
                throw new System.InvalidOperationException(
                    "InventoryGenerationComponent requires ShopPrice, MuzzleComp, BearingComp, and BaseComp data tables.");
            }

            if (_shopPriceRows.Count > 0)
            {
                return;
            }

            DRShopPrice[] rows = _shopPriceTable.GetAllDataRows();
            if (rows == null || rows.Length <= 0)
            {
                throw new System.InvalidOperationException(
                    "InventoryGenerationComponent requires at least one shop price row.");
            }

            foreach (var row in rows)
            {
                if (row != null)
                {
                    _shopPriceRows.Add(row);
                }
            }

            if (_shopPriceRows.Count <= 0)
            {
                throw new System.InvalidOperationException("InventoryGenerationComponent requires non-null shop price rows.");
            }
        }

        private void EnsureShopBuilder()
        {
            EnsureShopTables();
            _shopGoodsBuilder ??= new ShopGoodsBuilder(
                _shopPriceRows,
                _muzzleCompTable,
                _bearingCompTable,
                _baseCompTable);
        }

        private void EnsureDropTables()
        {
            _dropPoolTable ??= GameEntry.DataTable.GetDataTable<DROutGameDropPool>();
            _muzzleCompTable ??= GameEntry.DataTable.GetDataTable<DRMuzzleComp>();
            _bearingCompTable ??= GameEntry.DataTable.GetDataTable<DRBearingComp>();
            _baseCompTable ??= GameEntry.DataTable.GetDataTable<DRBaseComp>();

            if (_dropPoolTable == null || _muzzleCompTable == null || _bearingCompTable == null || _baseCompTable == null)
            {
                throw new System.InvalidOperationException(
                    "InventoryGenerationComponent requires OutGameDropPool, MuzzleComp, BearingComp, and BaseComp data tables.");
            }
        }

        private DropPoolRoller EnsureDropPoolRoller()
        {
            EnsureDropTables();
            _dropPoolRoller ??= new DropPoolRoller(_dropPoolTable);
            return _dropPoolRoller;
        }

        private RewardCandidateBuilder EnsureRewardCandidateBuilder()
        {
            _rewardCandidateBuilder ??= new RewardCandidateBuilder(EnsureDropPoolRoller());
            return _rewardCandidateBuilder;
        }

        private OutGameDropItemBuilder EnsureOutGameDropItemBuilder()
        {
            EnsureDropTables();
            _outGameDropItemBuilder ??= new OutGameDropItemBuilder(
                _muzzleCompTable,
                _bearingCompTable,
                _baseCompTable);
            return _outGameDropItemBuilder;
        }

        private bool TryRollOutGameItem(
            int displayPhaseIndex,
            LevelThemeType themeType,
            InventoryGenerationRandomContext randomContext,
            Random random,
            out TowerCompItemData droppedItem)
        {
            droppedItem = null;
            DropPoolRoller dropPoolRoller = EnsureDropPoolRoller();
            int phaseIndex = Mathf.Max(1, displayPhaseIndex);
            if (!dropPoolRoller.TryRollRow(
                    phaseIndex,
                    themeType,
                    random,
                    out DROutGameDropPool selectedRow,
                    out RarityType selectedRarity) || selectedRow == null)
            {
                return false;
            }

            return EnsureOutGameDropItemBuilder().TryBuildItem(selectedRow, selectedRarity, randomContext, out droppedItem);
        }

        private TowerCompItemData BuildRewardCandidateItem(
            DROutGameDropPool row,
            RarityType rarity,
            InventoryGenerationRandomContext randomContext)
        {
            if (!EnsureOutGameDropItemBuilder().TryBuildItem(row, rarity, randomContext, out TowerCompItemData droppedItem))
            {
                return null;
            }

            return droppedItem;
        }
    }
}