using System.Collections.Generic;
using System.Text;
using SepCore.Definition;
using SepCore.Entity;
using UnityGameFramework.Runtime;

namespace SepCore.CustomUtility
{
    public static class ItemDescUtility
    {
        private static readonly string[] _statTypeNames =
        {
            "无效",           // None = 0
            "最大生命",        // MaxHp = 1
            "生命恢复",        // HpRegen = 2
            "生命窃取",        // LifeSteal = 3
            "伤害加成",        // DamagePercent = 4
            "近战伤害",        // MeleeDamage = 5
            "远程伤害",        // RangedDamage = 6
            "元素伤害",        // ElementalDamage = 7
            "攻击速度",        // AttackSpeed = 8
            "暴击率",          // CritChance = 9
            "工程学",          // Engineering = 10
            "攻击范围",        // Range = 11
            "护甲",            // Armor = 12
            "闪避率",          // Dodge = 13
            "移动速度",        // MoveSpeed = 14
            "收获",           // Harvesting = 15
            "幸运"            // Luck = 16
        };
        
        public static string Describe(StatModifierConfig statModifierConfig)
        {
            if (statModifierConfig == null)
            {
                return string.Empty;
            }

            int index = (int)statModifierConfig.StatType;
            string name = (index >= 0 && index < _statTypeNames.Length) ? _statTypeNames[index] : statModifierConfig.StatType.ToString();
            string colorTag = statModifierConfig.Value >= 0 ? "green" : "red";
            string sign = statModifierConfig.Value >= 0 ? "+" : "";

            StatConfig statConfig = null;
            if (GameEntry.Luban != null && GameEntry.Luban.IsReady)
            {
                statConfig = GameEntry.Luban.Get<StatConfig>(index);
            }

            if (statConfig != null && !string.IsNullOrEmpty(statConfig.Name))
            {
                name = statConfig.Name;
            }

            // 是否以百分比展示：由 StatConfig.IsPercentDisplay 真正驱动（Luban 未就绪时 fallback 到已知百分比属性）
            bool isPercentDisplay = statConfig != null
                ? statConfig.IsPercentDisplay
                : (statModifierConfig.StatType is StatType.DamagePercent or StatType.AttackSpeed or StatType.CritChance or StatType.Dodge);

            // 1. 修饰类型判断
            bool isPercentAdd = statModifierConfig.ModifierType == ModifierType.PercentAdd;
            bool isPercentMult = statModifierConfig.ModifierType == ModifierType.PercentMult;
            bool isFlat = statModifierConfig.ModifierType == ModifierType.Flat;

            // 2. UI 百分比展示裁决：
            // - 任意属性的 PercentAdd 词条属于比例加成（如 攻速 +19%、伤害 +5%、移速 +15%）
            // - 或属性自身在配置表中标记为百分比显示（IsPercentDisplay 为 true，如暴击率、闪避率等），其 Flat 加成应以百分比呈现（如 0.1 -> +10%）
            bool shouldDisplayAsPercent = isPercentAdd || (isFlat && isPercentDisplay);

            if (shouldDisplayAsPercent)
            {
                float displayPercent = statModifierConfig.Value * 100f;
                return $"{name}: <color={colorTag}>{sign}{displayPercent:0.##}%</color>";
            }

            if (isPercentMult)
            {
                return $"{name}: <color={colorTag}>x{statModifierConfig.Value:0.##}</color>";
            }

            return $"{name}: <color={colorTag}>{sign}{statModifierConfig.Value:0.##}</color>";
        }
        
        public static string CreatePropDescription(IEnumerable<StatModifierConfig> modifiers)
        {
            if (modifiers == null)
            {
                return null;
            }

            StringBuilder sb = new StringBuilder();
            foreach (StatModifierConfig modifier in modifiers)
            {
                sb.Append(Describe(modifier));
                sb.Append('\n');
            }

            return sb.ToString();
        }

        public static string CreateWeaponDescription(WeaponConfig weaponConfig)
        {
            return CreateWeaponDescription(weaponConfig.Attack, weaponConfig.Cooldown,
                weaponConfig.AttackRange, weaponConfig.StatModifierConfigs);
        }
        
        public static string CreateWeaponDescription(WeaponData weaponData)
        {
            if (weaponData == null)
            {
                Log.Error("Weapon data is invalid.");
                return string.Empty;
            }

            return CreateWeaponDescription(weaponData.Attack, weaponData.Cooldown,
                weaponData.AttackRange, weaponData.Modifiers);
        }

        public static string CreatePropDescription(PropItem prop)
        {
            if (prop == null)
            {
                Log.Error("Prop is invalid.");
                return string.Empty;
            }

            return CreatePropDescription(prop.Modifiers);
        }

        public static string CreateWeaponDescription(int attack, float cooldown, float attackRange,
            IEnumerable<StatModifierConfig> modifiers = null)
        {
            float baseCrit = GameEntry.Luban.Global.WeaponBaseCrit;
            float critMult = GameEntry.Luban.Global.CritMultiplier;

            StringBuilder sb = new StringBuilder();
            sb.AppendLine($"伤害: {attack}");
            sb.AppendLine($"暴击: x{critMult:0.##} ({baseCrit * 100:0.##}%)");
            sb.AppendLine($"冷却: {cooldown:0.##}s");
            sb.AppendLine($"范围: {attackRange:0.##}");

            string modifiersDesc = CreatePropDescription(modifiers);
            if (!string.IsNullOrEmpty(modifiersDesc))
            {
                sb.AppendLine();
                sb.Append(modifiersDesc.TrimEnd());
            }

            return sb.ToString().TrimEnd();
        }
    }
}