using System.Collections;
using System;
using System.Collections.Generic;
using System.Reflection;
using GameFramework.DataTable;
using GeometryTD.CustomComponent;
using GeometryTD.DataTable;
using GeometryTD.Definition;
using GeometryTD.UI;
using NUnit.Framework;

namespace GeometryTD.Tests.EditMode
{
    public sealed class ShopPricingRuleTests
    {
        [Test]
        public void BuildGoods_Uses_Price_Row_Range_Matching_Item_Rarity()
        {
            ShopGoodsBuilder builder = CreateBuilder(
                CreateShopPriceRow(1, RarityType.Blue, 30, 35),
                CreateShopPriceRow(2, RarityType.Purple, 60, 70));

            List<GoodsItemRawData> goods = builder.BuildGoods(goodsCount: 12, runSeed: 3001, sequenceIndex: 4);

            Assert.That(goods, Has.Count.EqualTo(12));
            for (int i = 0; i < goods.Count; i++)
            {
                GoodsItemRawData item = goods[i];
                Assert.That(item, Is.Not.Null);
                Assert.That(item.SourceItem, Is.Not.Null);

                switch (item.SourceItem.Rarity)
                {
                    case RarityType.Blue:
                        Assert.That(item.Price, Is.InRange(30, 35));
                        break;
                    case RarityType.Purple:
                        Assert.That(item.Price, Is.InRange(60, 70));
                        break;
                    default:
                        Assert.Fail($"Unexpected rarity generated for goods item {i}: {item.SourceItem.Rarity}");
                        break;
                }
            }
        }

        [Test]
        public void BuildGoods_Is_Reproducible_For_Same_RunSeed_And_SequenceIndex()
        {
            ShopGoodsBuilder builder = CreateBuilder(
                CreateShopPriceRow(1, RarityType.Blue, 30, 35),
                CreateShopPriceRow(2, RarityType.Purple, 60, 70));

            string first = BuildGoodsSignature(builder.BuildGoods(goodsCount: 4, runSeed: 901, sequenceIndex: 7));
            string second = BuildGoodsSignature(builder.BuildGoods(goodsCount: 4, runSeed: 901, sequenceIndex: 7));

            Assert.That(second, Is.EqualTo(first));
        }

        [Test]
        public void ResolveRandomPrice_Returns_Zero_When_Rarity_Has_No_Price_Row()
        {
            ShopGoodsBuilder builder = CreateBuilder(CreateShopPriceRow(1, RarityType.Blue, 30, 35));
            MethodInfo method = typeof(ShopGoodsBuilder).GetMethod(
                "ResolveRandomPrice",
                BindingFlags.Instance | BindingFlags.NonPublic);

            Assert.That(method, Is.Not.Null);

            int resolvedPrice = (int)method.Invoke(builder, new object[] { RarityType.Red, new Random(7) });

            Assert.That(resolvedPrice, Is.EqualTo(0));
        }

        private static ShopGoodsBuilder CreateBuilder(params DRShopPrice[] shopPriceRows)
        {
            return new ShopGoodsBuilder(
                shopPriceRows,
                new FakeDataTable<DRMuzzleComp>(CreateMuzzleRow(1, "火焰枪口")),
                new FakeDataTable<DRBearingComp>(CreateBearingRow(1, "寒冰轴承")),
                new FakeDataTable<DRBaseComp>(CreateBaseRow(1, "迅捷底座")));
        }

        private static string BuildGoodsSignature(IReadOnlyList<GoodsItemRawData> goods)
        {
            List<string> parts = new List<string>(goods.Count);
            for (int i = 0; i < goods.Count; i++)
            {
                GoodsItemRawData item = goods[i];
                parts.Add($"{item.GoodsIndex}:{item.Price}:{item.SourceItem.SlotType}:{item.SourceItem.Rarity}:{item.SourceItem.ConfigId}");
            }

            return string.Join("|", parts);
        }

        private static DRShopPrice CreateShopPriceRow(int id, RarityType rarity, int minPrice, int maxPrice)
        {
            DRShopPrice row = new DRShopPrice();
            Assert.That(row.ParseDataRow($"\t{id}\t\t{rarity}\t{minPrice}\t{maxPrice}", null), Is.True);
            return row;
        }

        private static DRMuzzleComp CreateMuzzleRow(int id, string name)
        {
            DRMuzzleComp row = new DRMuzzleComp();
            Assert.That(
                row.ParseDataRow($"\t{id}\t\t{name}\t[10,20,30,40,50]\t3\t0.15\tNormalBullet\t\t[Fire,Crit]", null),
                Is.True);
            return row;
        }

        private static DRBearingComp CreateBearingRow(int id, string name)
        {
            DRBearingComp row = new DRBearingComp();
            Assert.That(
                row.ParseDataRow($"\t{id}\t\t{name}\t[1,2,3,4,5]\t0.5\t[10,20,30,40,50]\t1\t\t[Ice,Shatter]", null),
                Is.True);
            return row;
        }

        private static DRBaseComp CreateBaseRow(int id, string name)
        {
            DRBaseComp row = new DRBaseComp();
            Assert.That(
                row.ParseDataRow($"\t{id}\t\t{name}\t[2,4,6,8,10]\t-0.25\tFire\t\t[Fire,Crit]", null),
                Is.True);
            return row;
        }

        private sealed class FakeDataTable<TRow> : IDataTable<TRow> where TRow : class, IDataRow
        {
            private readonly Dictionary<int, TRow> _rowsById = new();

            public FakeDataTable(params TRow[] rows)
            {
                if (rows == null)
                {
                    return;
                }

                for (int i = 0; i < rows.Length; i++)
                {
                    TRow row = rows[i];
                    if (row != null)
                    {
                        _rowsById[row.Id] = row;
                    }
                }
            }

            public string Name => typeof(TRow).Name;
            public string FullName => typeof(TRow).FullName;
            public Type Type => typeof(TRow);
            public int Count => _rowsById.Count;
            public TRow this[int id] => GetDataRow(id);
            public TRow MinIdDataRow => _rowsById.Count <= 0 ? null : GetDataRow(GetOrderedIds()[0]);
            public TRow MaxIdDataRow => _rowsById.Count <= 0 ? null : GetDataRow(GetOrderedIds()[^1]);

            public bool HasDataRow(int id) => _rowsById.ContainsKey(id);
            public bool HasDataRow(Predicate<TRow> condition) => GetDataRow(condition) != null;
            public TRow GetDataRow(int id) => _rowsById.TryGetValue(id, out TRow row) ? row : null;

            public TRow GetDataRow(Predicate<TRow> condition)
            {
                if (condition == null)
                {
                    return null;
                }

                foreach (TRow row in _rowsById.Values)
                {
                    if (row != null && condition(row))
                    {
                        return row;
                    }
                }

                return null;
            }

            public TRow[] GetDataRows(Predicate<TRow> condition)
            {
                List<TRow> results = new();
                GetDataRows(condition, results);
                return results.ToArray();
            }

            public void GetDataRows(Predicate<TRow> condition, List<TRow> results)
            {
                results?.Clear();
                if (condition == null || results == null)
                {
                    return;
                }

                foreach (TRow row in _rowsById.Values)
                {
                    if (row != null && condition(row))
                    {
                        results.Add(row);
                    }
                }
            }

            public TRow[] GetDataRows(Comparison<TRow> comparison)
            {
                List<TRow> results = new();
                GetDataRows(comparison, results);
                return results.ToArray();
            }

            public void GetDataRows(Comparison<TRow> comparison, List<TRow> results)
            {
                results?.Clear();
                if (results == null)
                {
                    return;
                }

                results.AddRange(_rowsById.Values);
                if (comparison != null)
                {
                    results.Sort(comparison);
                }
            }

            public TRow[] GetDataRows(Predicate<TRow> condition, Comparison<TRow> comparison)
            {
                List<TRow> results = new();
                GetDataRows(condition, comparison, results);
                return results.ToArray();
            }

            public void GetDataRows(Predicate<TRow> condition, Comparison<TRow> comparison, List<TRow> results)
            {
                GetDataRows(condition, results);
                if (results != null && comparison != null)
                {
                    results.Sort(comparison);
                }
            }

            public TRow[] GetAllDataRows()
            {
                List<TRow> results = new();
                GetAllDataRows(results);
                return results.ToArray();
            }

            public void GetAllDataRows(List<TRow> results)
            {
                results?.Clear();
                if (results == null)
                {
                    return;
                }

                foreach (int id in GetOrderedIds())
                {
                    results.Add(_rowsById[id]);
                }
            }

            public bool AddDataRow(string dataRowString, object userData) => throw new NotSupportedException();
            public bool AddDataRow(byte[] dataRowBytes, int startIndex, int length, object userData) => throw new NotSupportedException();
            public bool RemoveDataRow(int id) => _rowsById.Remove(id);

            public void RemoveAllDataRows()
            {
                _rowsById.Clear();
            }

            public IEnumerator<TRow> GetEnumerator()
            {
                foreach (int id in GetOrderedIds())
                {
                    yield return _rowsById[id];
                }
            }

            IEnumerator IEnumerable.GetEnumerator()
            {
                return GetEnumerator();
            }

            private int[] GetOrderedIds()
            {
                int[] ids = new int[_rowsById.Count];
                _rowsById.Keys.CopyTo(ids, 0);
                Array.Sort(ids);
                return ids;
            }
        }
    }
}