using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;
using NCalc;

namespace KairoEngine.Stats
{
    [System.Serializable]
    public class Stat
    {
        [HideInInspector] public string title;
        private string description;

        [LabelText("@title"), PropertyOrder(1)]
        [ProgressBar("@_minValue + modifiers.minValue", "@_maxValue + modifiers.maxValue", ColorGetter="GetDisplayColor", Height=18)]
        [PropertyTooltip("@description"), ShowInInspector, InlineButton("ShowModifiers", "@modifiers.pretyCount()")]
        public int value
        {
            get 
            {
                if(template.currentValueType == StatValueType.Equation) this._value = SolveEquation(template.currentValueEquation);
                int finalValue = this._value;
                finalValue += modifiers.value;
                if(finalValue > maxValue) finalValue = maxValue;
                if(finalValue < minValue) finalValue = minValue;
                return finalValue;
            }
            set 
            {
                if(template.currentValueType == StatValueType.Value)  this._value = value;
                else _value = SolveEquation(template.currentValueEquation);
                if(this._value > maxValue) this._value = maxValue;
                if(this._value < minValue) this._value = minValue;
                if(this._value != value) Changed();
            }
        }
        [SerializeField, HideInInspector] private int _value;
        public int GetValueRaw() => _value;
        
        public int minValue
        {
            get
            {
                if(template.minValueType == StatValueType.Equation) this._minValue = SolveEquation(template.minValueEquation);
                int finalValue = this._minValue;
                finalValue += modifiers.minValue;
                return finalValue;
            }
            set 
            {
                if(template.minValueType == StatValueType.Value)  this._minValue = value;
                else this._minValue = SolveEquation(template.minValueEquation);
            }
        }
        [SerializeField, HideInInspector] private int _minValue = 0;
        public int GetMinValueRaw() => _minValue;

        public int maxValue
        {
            get
            {
                if(template.maxValueType == StatValueType.Equation) this._maxValue = SolveEquation(template.maxValueEquation);
                int finalValue = this._maxValue;
                finalValue += modifiers.maxValue;
                return finalValue;
            }
            set 
            {
                if(template.maxValueType == StatValueType.Value)  this._maxValue = value;
                else this._maxValue = SolveEquation(template.maxValueEquation);
            }
        }
        [SerializeField, HideInInspector] private int _maxValue = 1;
        public int GetMaxValueRaw() => _maxValue;

        private bool showModifiersEditor = false;
        [PropertyOrder(2), InlineProperty, HideLabel, ShowIf("@showModifiersEditor"), Space] public StatModifiersController modifiers;

        [SerializeField, HideInInspector] public StatTemplate template;

        [HideInInspector, System.NonSerialized] public StatsController controller;

        public Stat(StatTemplate template, StatsController controller, SerializedStat data = null)
        {
            this.title = template.title;
            this.template = template;
            this.controller = controller;
            this.description = template.description;
            this.modifiers = new StatModifiersController(this);
            if(data != null)
            {
                _value = data.value;
                _minValue = data.minValue;
                _maxValue = data.maxValue;
                for (int i = 0; i < data.modifiers.Count; i++) modifiers.list.Add(data.modifiers[i]);
            }
            this.modifiers.Calculate();
        }

        public void Initialize()
        {
            if(template.currentValueType == StatValueType.Value)
            {
                if(template.initialValueType == StatValueType.Value) this.value = template.initialValue;
                else this.value = SolveEquation(template.initialValueEquation);
            }
            else this._value = value;
            this.minValue = template.minValue;
            this.maxValue = template.maxValue;
            modifiers.stat = this;
        }

        public void Update()
        {
            title = template.title;
            description = template.description;
            value = _value;
            minValue = _minValue;
            maxValue =_maxValue;
            //Debug.Log($"Updating {StatLog()}");
        }

        public void Changed() => controller.UpdateStats();

        public int SolveEquation(string equation)
        {
            int result = 0;
            if(equation == "") 
            {
                Debug.LogError(StatLog());
                return result;
            }
            if(controller == null) return result;
            var expr = new Expression(equation);
            Func<StatEquationContext, int> f = expr.ToLambda<StatEquationContext, int>();
            var context = new StatEquationContext { value = _value, minValue = _minValue, maxValue = _maxValue, controller = controller};
            result = f(context);
            //Debug.Log($"{title}: {equation} = {result}");
            return result;
        }

        public string StatLog()
        {
            string s = $" {title}: ";
            s += $" value={this._value} minValue={this._minValue} maxValue={this._maxValue} ";
            if(template.currentValueType == StatValueType.Equation) s += $"currentEquation='{template.currentValueEquation}' ";
            if(template.initialValueType == StatValueType.Equation) s += $"initialEquation='{template.initialValueEquation}' ";
            if(template.minValueType == StatValueType.Equation) s += $"minEquation='{template.minValueEquation}' ";
            if(template.maxValueType == StatValueType.Equation) s += $"maxEquation='{template.maxValueEquation}' ";
            return s;
        }

        private Color GetDisplayColor()
        {
            if(template.currentValueType == StatValueType.Equation) return Color.gray;
            else 
            {
                Color color;
                if ( !ColorUtility.TryParseHtmlString("#3e649e", out color)) color = Color.cyan;
                return color;
            }
        }

        public SerializedStat Serialize() => new SerializedStat(title, _value, _minValue, _maxValue, modifiers.list);

        public static Stat Deserialize(SerializedStat data, StatsController controller)
        {
            Stat stat = new Stat(controller.GetStatTemplate(data.title), controller, data);
            return stat;
        }

        public void ShowModifiers()
        {
            if(showModifiersEditor) showModifiersEditor = false;
            else showModifiersEditor = true;
            modifiers.Calculate();
        }
    }

    public class StatEquationContext
    {
        public int value { get; set; }
        public int minValue { get; set; }
        public int maxValue { get; set; }
        public StatsController controller { get; set; }
        public int s(string title) => controller.GetStatValue(title);
    }

    [System.Serializable]
    public class SerializedStat
    {
        public string title;
        public int value;
        public int minValue;
        public int maxValue;

        public List<StatModifier> modifiers = new List<StatModifier>();

        public SerializedStat(string title, int value, int minValue, int maxValue, List<StatModifier> modifiers)
        {
            this.title = title;
            this.value = value;
            this.minValue = minValue;
            this.maxValue = maxValue;
            for (int i = 0; i < modifiers.Count; i++)
            {
                this.modifiers.Add(modifiers[i]);
            }
        }
    }
}