using System.Collections.Generic;
using UnityEngine;

namespace SLSUtilities.Narrative
{
    /// <summary>
    /// 条件匹配评估工具类。
    /// 读取并比对 StorySystem.Variables 中的运行时状态，支持多种类型的变量与运算符。
    /// </summary>
    public static class NarrativeConditionEvaluator
    {
        /// <summary>
        /// 评估一系列条件是否全部满足 (AND 关系)。
        /// </summary>
        public static bool Evaluate(List<NarrativeCondition> conditions)
        {
            if (conditions == null || conditions.Count == 0)
                return true; // 无条件默认满足

            if (StorySystem.Variables == null)
            {
                Debug.LogWarning("[StorySystem] 评估条件失败：StorySystem.Variables 尚未初始化。");
                return false;
            }

            foreach (var cond in conditions)
            {
                if (string.IsNullOrEmpty(cond.key))
                {
                    Debug.LogWarning("[StorySystem] 条件配置错误：变量 key 为空。");
                    return false;
                }

                if (!EvaluateCondition(cond))
                    return false; // 任何一个条件不满足，直接返回 false
            }

            return true;
        }

        private static bool EvaluateCondition(NarrativeCondition cond)
        {
            switch (cond.type)
            {
                case NarrativeCondition.ConditionType.Bool:
                    return EvaluateBool(cond);
                case NarrativeCondition.ConditionType.Int:
                    return EvaluateInt(cond);
                case NarrativeCondition.ConditionType.Float:
                    return EvaluateFloat(cond);
                case NarrativeCondition.ConditionType.String:
                    return EvaluateString(cond);
                default:
                    Debug.LogWarning($"[StorySystem] 未知的条件类型: {cond.type}");
                    return false;
            }
        }

        private static bool EvaluateBool(NarrativeCondition cond)
        {
            bool currentVal = false;
            if (!StorySystem.Variables.boolVariables.TryGetValue(cond.key, out currentVal))
            {
                Debug.LogWarning($"[StorySystem] 变量未找到: Bool '{cond.key}'，使用默认值 false 匹配。");
            }

            if (!bool.TryParse(cond.value, out bool targetVal))
            {
                Debug.LogError($"[StorySystem] 无法将目标值 '{cond.value}' 解析为 Bool。条件键: {cond.key}");
                return false;
            }

            switch (cond.op)
            {
                case NarrativeCondition.CompareOp.Equal:
                    return currentVal == targetVal;
                case NarrativeCondition.CompareOp.NotEqual:
                    return currentVal != targetVal;
                default:
                    Debug.LogWarning($"[StorySystem] 布尔类型不支持比较运算符: {cond.op}，必须为 Equal 或 NotEqual。");
                    return false;
            }
        }

        private static bool EvaluateInt(NarrativeCondition cond)
        {
            int currentVal = 0;
            if (!StorySystem.Variables.intVariables.TryGetValue(cond.key, out currentVal))
            {
                Debug.LogWarning($"[StorySystem] 变量未找到: Int '{cond.key}'，使用默认值 0 匹配。");
            }

            if (!int.TryParse(cond.value, out int targetVal))
            {
                Debug.LogError($"[StorySystem] 无法将目标值 '{cond.value}' 解析为 Int。条件键: {cond.key}");
                return false;
            }

            switch (cond.op)
            {
                case NarrativeCondition.CompareOp.Equal:
                    return currentVal == targetVal;
                case NarrativeCondition.CompareOp.NotEqual:
                    return currentVal != targetVal;
                case NarrativeCondition.CompareOp.Greater:
                    return currentVal > targetVal;
                case NarrativeCondition.CompareOp.GreaterOrEqual:
                    return currentVal >= targetVal;
                case NarrativeCondition.CompareOp.Less:
                    return currentVal < targetVal;
                case NarrativeCondition.CompareOp.LessOrEqual:
                    return currentVal <= targetVal;
                default:
                    return false;
            }
        }

        private static bool EvaluateFloat(NarrativeCondition cond)
        {
            float currentVal = 0f;
            if (!StorySystem.Variables.floatVariables.TryGetValue(cond.key, out currentVal))
            {
                Debug.LogWarning($"[StorySystem] 变量未找到: Float '{cond.key}'，使用默认值 0.0 匹配。");
            }

            if (!float.TryParse(cond.value, out float targetVal))
            {
                Debug.LogError($"[StorySystem] 无法将目标值 '{cond.value}' 解析为 Float。条件键: {cond.key}");
                return false;
            }

            switch (cond.op)
            {
                case NarrativeCondition.CompareOp.Equal:
                    return Mathf.Approximately(currentVal, targetVal);
                case NarrativeCondition.CompareOp.NotEqual:
                    return !Mathf.Approximately(currentVal, targetVal);
                case NarrativeCondition.CompareOp.Greater:
                    return currentVal > targetVal;
                case NarrativeCondition.CompareOp.GreaterOrEqual:
                    return currentVal >= targetVal;
                case NarrativeCondition.CompareOp.Less:
                    return currentVal < targetVal;
                case NarrativeCondition.CompareOp.LessOrEqual:
                    return currentVal <= targetVal;
                default:
                    return false;
            }
        }

        private static bool EvaluateString(NarrativeCondition cond)
        {
            string currentVal = string.Empty;
            if (!StorySystem.Variables.stringVariables.TryGetValue(cond.key, out currentVal))
            {
                Debug.LogWarning($"[StorySystem] 变量未找到: String '{cond.key}'，使用默认空字符串匹配。");
            }

            string targetVal = cond.value ?? string.Empty;

            switch (cond.op)
            {
                case NarrativeCondition.CompareOp.Equal:
                    return currentVal == targetVal;
                case NarrativeCondition.CompareOp.NotEqual:
                    return currentVal != targetVal;
                default:
                    Debug.LogWarning($"[StorySystem] 字符串类型不支持比较运算符: {cond.op}，必须为 Equal 或 NotEqual。");
                    return false;
            }
        }
    }
}