using System;
using NUnit.Framework;
using SepCore.Battle;
using SepCore.Definition;

namespace VampireLike.Tests.Gameplay.EditMode
{
    [TestFixture]
    public class AttributePipelineTests
    {
        [Test]
        public void FormulaOrder_CalculatesFlatPercentAddAndPercentMultCorrectly()
        {
            var stat = new CharacterStat(StatType.MeleeDamage, baseValue: 10f);

            // Formula: ((Base + Sum(Flat)) * (1 + Sum(PercentAdd))) * Prod(PercentMult)
            // Flat: +5, +3 -> Sum = +8 -> Base + Flat = 18
            stat.AddModifier(new StatModifier(5f, ModifierType.Flat));
            stat.AddModifier(new StatModifier(3f, ModifierType.Flat));

            // PercentAdd: +20% (0.2), +30% (0.3) -> Sum = +50% -> 1 + 0.5 = 1.5
            stat.AddModifier(new StatModifier(0.2f, ModifierType.PercentAdd));
            stat.AddModifier(new StatModifier(0.3f, ModifierType.PercentAdd));

            // PercentMult: 1.2x, 1.5x -> Prod = 1.8
            stat.AddModifier(new StatModifier(1.2f, ModifierType.PercentMult));
            stat.AddModifier(new StatModifier(1.5f, ModifierType.PercentMult));

            // Expected: 18 * 1.5 * 1.8 = 48.6
            Assert.AreEqual(48.6f, stat.Value, 1e-4f);
        }

        [Test]
        public void DirtyFlag_CachesValueUntilModified()
        {
            var stat = new CharacterStat(StatType.MaxHp, baseValue: 100f);
            var mod = new StatModifier(20f, ModifierType.Flat);

            stat.AddModifier(mod);
            float firstRead = stat.Value;
            Assert.AreEqual(120f, firstRead, 1e-4f);

            // 读取多次，验证缓存值一致
            float secondRead = stat.Value;
            Assert.AreEqual(120f, secondRead, 1e-4f);

            // 移除修饰器后脏标记生效，值重新计算
            stat.RemoveModifier(mod);
            Assert.AreEqual(100f, stat.Value, 1e-4f);

            // 修改 BaseValue 后脏标记生效
            stat.BaseValue = 150f;
            Assert.AreEqual(150f, stat.Value, 1e-4f);
        }

        [Test]
        public void RemoveAllModifiersFromSource_RemovesOnlyMatchingSource()
        {
            var pipeline = new AttributePipeline();
            var sourceA = new object();
            var sourceB = new object();

            pipeline.SetBaseValue(StatType.MeleeDamage, 10f);
            pipeline.SetBaseValue(StatType.MoveSpeed, 5f);

            // sourceA 附加加成到近战伤害与移速
            pipeline.AddModifier(StatType.MeleeDamage, new StatModifier(10f, ModifierType.Flat, sourceA));
            pipeline.AddModifier(StatType.MoveSpeed, new StatModifier(0.2f, ModifierType.PercentAdd, sourceA));

            // sourceB 附加加成到近战伤害
            pipeline.AddModifier(StatType.MeleeDamage, new StatModifier(5f, ModifierType.Flat, sourceB));

            Assert.AreEqual(25f, pipeline.GetValue(StatType.MeleeDamage), 1e-4f);
            Assert.AreEqual(6f, pipeline.GetValue(StatType.MoveSpeed), 1e-4f);

            // 清理 sourceA
            int removedCount = pipeline.RemoveAllModifiersFromSource(sourceA);
            Assert.AreEqual(2, removedCount);

            // 验证 sourceA 被清除，sourceB 依然生效
            Assert.AreEqual(15f, pipeline.GetValue(StatType.MeleeDamage), 1e-4f);
            Assert.AreEqual(5f, pipeline.GetValue(StatType.MoveSpeed), 1e-4f);
        }

        [Test]
        public void StatConfig_ClampsMinAndMaxCorrectly()
        {
            // 闪避率硬上限 80% (0.8f) 来自配置表
            var dodgeConfig = new StatConfig(StatType.Dodge, hasMin: true, minValue: 0f, hasMax: true, maxValue: 0.80f);
            var dodgeStat = new CharacterStat(StatType.Dodge, baseValue: 0.50f, dodgeConfig);
            dodgeStat.AddModifier(new StatModifier(0.40f, ModifierType.Flat));
            Assert.AreEqual(0.80f, dodgeStat.Value, 1e-4f);

            // 移速保底 0.5f 来自配置表
            var speedConfig = new StatConfig(StatType.MoveSpeed, hasMin: true, minValue: 0.5f);
            var speedStat = new CharacterStat(StatType.MoveSpeed, baseValue: 3f, speedConfig);
            speedStat.AddModifier(new StatModifier(-10f, ModifierType.Flat));
            Assert.AreEqual(0.5f, speedStat.Value, 1e-4f);

            // 暴击率硬上限 90% (0.9f) 来自配置表
            var critConfig = new StatConfig(StatType.CritChance, hasMin: true, minValue: 0f, hasMax: true, maxValue: 0.90f);
            var critStat = new CharacterStat(StatType.CritChance, baseValue: 0.50f, critConfig);
            critStat.AddModifier(new StatModifier(0.60f, ModifierType.Flat));
            Assert.AreEqual(0.90f, critStat.Value, 1e-4f);
        }

        [Test]
        public void FromLuban_ConvertsFlatAndPercentModifiersCorrectly()
        {
            // 1. 固定值 (Flat): 比如近战伤害 +15
            var flatConfig = new StatModifierConfig(StatType.MeleeDamage, 15f, ModifierType.Flat);
            var flatStatMod = StatModifier.FromLuban(flatConfig);
            Assert.AreEqual(ModifierType.Flat, flatStatMod.Type);
            Assert.AreEqual(15f, flatStatMod.Value, 1e-4f);

            // 2. 百分比累加 (PercentAdd): 比如伤害 +20% (0.2f)
            var percentConfig = new StatModifierConfig(StatType.DamagePercent, 0.2f, ModifierType.PercentAdd);
            var percentStatMod = StatModifier.FromLuban(percentConfig);
            Assert.AreEqual(ModifierType.PercentAdd, percentStatMod.Type);
            Assert.AreEqual(0.2f, percentStatMod.Value, 1e-4f);

            // 3. 独立乘区 (PercentMult): 比如伤害 1.5 倍
            var multConfig = new StatModifierConfig(StatType.DamagePercent, 1.5f, ModifierType.PercentMult);
            var multStatMod = StatModifier.FromLuban(multConfig);
            Assert.AreEqual(ModifierType.PercentMult, multStatMod.Type);
            Assert.AreEqual(1.5f, multStatMod.Value, 1e-4f);
        }

        [Test]
        public void OnStatChanged_FiresOnModifications()
        {
            var pipeline = new AttributePipeline();
            StatType changedStat = StatType.None;
            float changedValue = 0f;
            int eventCount = 0;

            pipeline.OnStatChanged += (type, val) =>
            {
                changedStat = type;
                changedValue = val;
                eventCount++;
            };

            // 设置基础值
            pipeline.SetBaseValue(StatType.Armor, 10f);
            Assert.AreEqual(StatType.Armor, changedStat);
            Assert.AreEqual(10f, changedValue, 1e-4f);
            Assert.AreEqual(1, eventCount);

            // 添加修饰器
            var mod = new StatModifier(5f, ModifierType.Flat);
            pipeline.AddModifier(StatType.Armor, mod);
            Assert.AreEqual(15f, changedValue, 1e-4f);
            Assert.AreEqual(2, eventCount);

            // 移除修饰器
            pipeline.RemoveModifier(StatType.Armor, mod);
            Assert.AreEqual(10f, changedValue, 1e-4f);
            Assert.AreEqual(3, eventCount);
        }

        [Test]
        public void DynamicConfig_MarksDirtyAndUpdatesClamp()
        {
            var stat = new CharacterStat(StatType.Dodge, baseValue: 0.90f);
            Assert.AreEqual(0.90f, stat.Value, 1e-4f); // 未注入配置时不钳制

            // 动态注入配置，硬上限 80%
            stat.Config = new StatConfig(StatType.Dodge, hasMax: true, maxValue: 0.80f);
            Assert.AreEqual(0.80f, stat.Value, 1e-4f); // 自动标记脏并重新钳制
        }
    }
}