using System.Collections.Generic;
using UnityEngine;

public static class AllyHeroGrowthService
{
    private const string RuntimeRulesPath = "so/system/hero_growth_rules";

    public static bool TryUseBottleOnHero(expBottlesSO bottleDefinition, AllyHero_SO hero, int bottleCount, out string failureMessage, out int consumedBottleCount, out int totalGrantedExp)
    {
        failureMessage = null;
        consumedBottleCount = 0;
        totalGrantedExp = 0;

        if (bottleDefinition == null)
        {
            failureMessage = "经验瓶定义缺失";
            return false;
        }

        if (hero == null)
        {
            failureMessage = "目标偶像不存在";
            return false;
        }

        if (bottleDefinition.bottleType != expBottlesSO.BottleType.Normal)
        {
            failureMessage = "该经验瓶不是单体经验瓶";
            return false;
        }

        if (bottleCount <= 0)
        {
            failureMessage = "经验瓶数量无效";
            return false;
        }

        HeroGrowthTier unlockedTier = GetUnlockedTier(hero);
        if (unlockedTier >= HeroGrowthTier.S)
        {
            failureMessage = "S级偶像不可继续培养";
            return false;
        }

        if (!CanBottleServeTier(bottleDefinition.serviceLevel, unlockedTier))
        {
            failureMessage = "该经验瓶不可用于当前偶像等级";
            return false;
        }

        List<AllyHero_SO.AllyLevelInfo> sortedLevels = GetSortedLevels(hero);
        if (sortedLevels.Count < 2)
        {
            failureMessage = "偶像等级数据不完整";
            return false;
        }

        int tierIndex = Mathf.Clamp((int)unlockedTier, 0, sortedLevels.Count - 1);
        int currentExp = AllyHeroDeployLedger.EnsureInstance().GetCurrentExp(hero.ally_heroID);
        int currentCap = GetCurrentTierCap(sortedLevels, tierIndex);
        if (currentExp >= currentCap)
        {
            failureMessage = "当前等级已满，请先突破";
            return false;
        }

        if (!ExpBottleLedger.EnsureInstance().HasEnough(bottleDefinition.bottleKind, bottleCount))
        {
            failureMessage = "经验瓶库存不足";
            return false;
        }

        int nextExp = currentExp;
        for (int i = 0; i < bottleCount; i++)
        {
            if (nextExp >= currentCap)
            {
                break;
            }

            int appliedExp = ResolveBottleExpGain(bottleDefinition, nextExp, currentCap);
            if (appliedExp <= 0)
            {
                break;
            }

            int before = nextExp;
            nextExp = Mathf.Min(currentCap, nextExp + appliedExp);
            consumedBottleCount++;
            totalGrantedExp += Mathf.Max(0, nextExp - before);
        }

        if (consumedBottleCount <= 0)
        {
            failureMessage = "当前经验瓶对该偶像无效";
            return false;
        }

        if (!ExpBottleLedger.EnsureInstance().TryConsume(bottleDefinition.bottleKind, consumedBottleCount))
        {
            consumedBottleCount = 0;
            totalGrantedExp = 0;
            failureMessage = "经验瓶库存不足";
            return false;
        }

        AllyHeroDeployLedger.EnsureInstance().SetCurrentExp(hero, nextExp);
        return true;
    }

    public static bool TryUseRainAllBottle(expBottlesSO bottleDefinition, IList<AllyHero_SO> heroes, int bottleCount, out string failureMessage, out int consumedBottleCount, out int totalGrantedExp)
    {
        failureMessage = null;
        consumedBottleCount = 0;
        totalGrantedExp = 0;

        if (bottleDefinition == null)
        {
            failureMessage = "经验瓶定义缺失";
            return false;
        }

        if (bottleDefinition.bottleType != expBottlesSO.BottleType.RainAll)
        {
            failureMessage = "该经验瓶不是雨露均沾经验瓶";
            return false;
        }

        if (heroes == null || heroes.Count == 0)
        {
            failureMessage = "没有可作用的偶像";
            return false;
        }

        if (bottleCount <= 0)
        {
            failureMessage = "经验瓶数量无效";
            return false;
        }

        if (!ExpBottleLedger.EnsureInstance().HasEnough(bottleDefinition.bottleKind, bottleCount))
        {
            failureMessage = "经验瓶库存不足";
            return false;
        }

        int targetCount = Mathf.Max(0, bottleDefinition.rainAllTargetCount);
        int expPerHero = Mathf.Max(0, bottleDefinition.rainAllGrantedExpPerHero);
        if (targetCount <= 0 || expPerHero <= 0)
        {
            failureMessage = "雨露均沾经验瓶定义不完整";
            return false;
        }

        int remainingUses = bottleCount;
        while (remainingUses > 0)
        {
            List<AllyHero_SO> eligible = BuildEligibleRainAllTargets(heroes);
            if (eligible.Count == 0)
            {
                break;
            }

            ShuffleInPlace(eligible);
            int applyCount = Mathf.Min(targetCount, eligible.Count);
            int grantedThisUse = 0;

            for (int i = 0; i < applyCount; i++)
            {
                AllyHero_SO hero = eligible[i];
                List<AllyHero_SO.AllyLevelInfo> sortedLevels = GetSortedLevels(hero);
                if (sortedLevels.Count < 2)
                {
                    continue;
                }

                int tierIndex = AllyHeroDeployLedger.EnsureInstance().GetUnlockedTierIndex(hero.ally_heroID);
                int currentExp = AllyHeroDeployLedger.EnsureInstance().GetCurrentExp(hero.ally_heroID);
                int currentCap = GetCurrentTierCap(sortedLevels, tierIndex);
                if (currentExp >= currentCap)
                {
                    continue;
                }

                int nextExp = Mathf.Min(currentCap, currentExp + expPerHero);
                grantedThisUse += Mathf.Max(0, nextExp - currentExp);
                AllyHeroDeployLedger.EnsureInstance().SetCurrentExp(hero, nextExp);
            }

            consumedBottleCount++;
            totalGrantedExp += grantedThisUse;
            remainingUses--;
        }

        if (consumedBottleCount <= 0)
        {
            failureMessage = "没有可被该经验瓶作用的偶像";
            return false;
        }

        if (!ExpBottleLedger.EnsureInstance().TryConsume(bottleDefinition.bottleKind, consumedBottleCount))
        {
            consumedBottleCount = 0;
            totalGrantedExp = 0;
            failureMessage = "经验瓶库存不足";
            return false;
        }

        return true;
    }

    public static bool TryBreakthrough(AllyHero_SO hero, out string failureMessage)
    {
        failureMessage = null;

        if (hero == null)
        {
            failureMessage = "目标偶像不存在";
            return false;
        }

        HeroGrowthTier unlockedTier = GetUnlockedTier(hero);
        if (unlockedTier >= HeroGrowthTier.S)
        {
            failureMessage = "当前偶像已到最高培养等级";
            return false;
        }

        List<AllyHero_SO.AllyLevelInfo> sortedLevels = GetSortedLevels(hero);
        if (sortedLevels.Count < 2)
        {
            failureMessage = "偶像等级数据不完整";
            return false;
        }

        int tierIndex = Mathf.Clamp((int)unlockedTier, 0, sortedLevels.Count - 1);
        int currentExp = AllyHeroDeployLedger.EnsureInstance().GetCurrentExp(hero.ally_heroID);
        int currentCap = GetCurrentTierCap(sortedLevels, tierIndex);
        if (currentExp < currentCap)
        {
            failureMessage = "当前等级经验未满，无法突破";
            return false;
        }

        HeroGrowthRulesSO rules = LoadRules();
        if (rules == null)
        {
            failureMessage = "未配置成长规则";
            return false;
        }

        HeroGrowthRulesSO.BreakthroughRule rule = FindBreakthroughRule(rules, unlockedTier);
        if (rule == null || rule.requirements == null || rule.requirements.Count == 0)
        {
            failureMessage = "未配置突破材料";
            return false;
        }

        for (int i = 0; i < rule.requirements.Count; i++)
        {
            HeroGrowthRulesSO.MaterialRequirement requirement = rule.requirements[i];
            if (requirement == null || requirement.amount <= 0)
            {
                continue;
            }

            if (DushMaterialLedger.EnsureInstance().GetCount(requirement.materialKind) < requirement.amount)
            {
                failureMessage = "突破材料不足";
                return false;
            }
        }

        bool anyPositiveRequirement = false;
        for (int i = 0; i < rule.requirements.Count; i++)
        {
            HeroGrowthRulesSO.MaterialRequirement requirement = rule.requirements[i];
            if (requirement == null || requirement.amount <= 0)
            {
                continue;
            }

            anyPositiveRequirement = true;
            if (!DushMaterialLedger.EnsureInstance().TryConsume(requirement.materialKind, requirement.amount))
            {
                failureMessage = "突破材料不足";
                return false;
            }
        }

        if (!anyPositiveRequirement)
        {
            failureMessage = "未配置突破材料";
            return false;
        }

        AllyHeroDeployLedger.EnsureInstance().SetUnlockedTierIndex(hero, tierIndex + 1);
        return true;
    }

    public static HeroGrowthTier GetUnlockedTier(AllyHero_SO hero)
    {
        if (hero == null)
        {
            return HeroGrowthTier.C;
        }

        return (HeroGrowthTier)Mathf.Clamp(AllyHeroDeployLedger.EnsureInstance().GetUnlockedTierIndex(hero.ally_heroID), 0, 3);
    }

    private static HeroGrowthRulesSO LoadRules()
    {
        return Resources.Load<HeroGrowthRulesSO>(RuntimeRulesPath);
    }

    private static HeroGrowthRulesSO.BreakthroughRule FindBreakthroughRule(HeroGrowthRulesSO rules, HeroGrowthTier tier)
    {
        if (rules == null || rules.breakthroughRules == null)
        {
            return null;
        }

        for (int i = 0; i < rules.breakthroughRules.Count; i++)
        {
            HeroGrowthRulesSO.BreakthroughRule rule = rules.breakthroughRules[i];
            if (rule != null && rule.fromTier == tier)
            {
                return rule;
            }
        }

        return null;
    }

    private static bool CanBottleServeTier(expBottlesSO.ServiceLevel serviceLevel, HeroGrowthTier tier)
    {
        switch (serviceLevel)
        {
            case expBottlesSO.ServiceLevel.Any:
                return true;
            case expBottlesSO.ServiceLevel.C:
                return tier == HeroGrowthTier.C;
            case expBottlesSO.ServiceLevel.B:
                return tier == HeroGrowthTier.B;
            case expBottlesSO.ServiceLevel.A:
                return tier == HeroGrowthTier.A;
            case expBottlesSO.ServiceLevel.S:
                return tier == HeroGrowthTier.S;
            default:
                return false;
        }
    }

    private static int ResolveBottleExpGain(expBottlesSO bottleDefinition, int currentExp, int currentCap)
    {
        switch (bottleDefinition.expApplyMode)
        {
            case expBottlesSO.ExpApplyMode.FillCurrentLevel:
                return Mathf.Max(0, currentCap - currentExp);
            case expBottlesSO.ExpApplyMode.FillAllLevels:
                return Mathf.Max(0, currentCap - currentExp);
            default:
                return Mathf.Max(0, bottleDefinition.grantedExp);
        }
    }

    private static int GetCurrentTierCap(List<AllyHero_SO.AllyLevelInfo> sortedLevels, int tierIndex)
    {
        int nextIndex = Mathf.Clamp(tierIndex + 1, 0, sortedLevels.Count - 1);
        if (nextIndex == tierIndex)
        {
            return sortedLevels[tierIndex].requiredEXP;
        }

        return Mathf.Max(sortedLevels[tierIndex].requiredEXP, sortedLevels[nextIndex].requiredEXP);
    }

    private static List<AllyHero_SO.AllyLevelInfo> GetSortedLevels(AllyHero_SO hero)
    {
        List<AllyHero_SO.AllyLevelInfo> sorted = new List<AllyHero_SO.AllyLevelInfo>();
        if (hero == null || hero.levelStats == null)
        {
            return sorted;
        }

        for (int i = 0; i < hero.levelStats.Count; i++)
        {
            if (hero.levelStats[i] != null)
            {
                sorted.Add(hero.levelStats[i]);
            }
        }

        sorted.Sort((left, right) => left.requiredEXP.CompareTo(right.requiredEXP));
        return sorted;
    }

    private static List<AllyHero_SO> BuildEligibleRainAllTargets(IList<AllyHero_SO> heroes)
    {
        List<AllyHero_SO> result = new List<AllyHero_SO>();
        for (int i = 0; i < heroes.Count; i++)
        {
            AllyHero_SO hero = heroes[i];
            if (hero == null)
            {
                continue;
            }

            HeroGrowthTier tier = GetUnlockedTier(hero);
            if (tier >= HeroGrowthTier.S)
            {
                continue;
            }

            List<AllyHero_SO.AllyLevelInfo> sortedLevels = GetSortedLevels(hero);
            if (sortedLevels.Count < 2)
            {
                continue;
            }

            int currentExp = AllyHeroDeployLedger.EnsureInstance().GetCurrentExp(hero.ally_heroID);
            int currentCap = GetCurrentTierCap(sortedLevels, (int)tier);
            if (currentExp >= currentCap)
            {
                continue;
            }

            result.Add(hero);
        }

        return result;
    }

    private static void ShuffleInPlace<T>(IList<T> list)
    {
        for (int i = list.Count - 1; i > 0; i--)
        {
            int swapIndex = Random.Range(0, i + 1);
            T temp = list[i];
            list[i] = list[swapIndex];
            list[swapIndex] = temp;
        }
    }
}