using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Reflection;
using System.Drawing;

namespace Uni_Trend.MSO7000X.UserControls.Style
{
    public class StyleManager
    {
        //静态只读单例
        public readonly static StyleManager Instance = new StyleManager();
        private List<Control> _styleControls = new List<Control>();

        private IControlStyle _controlStyle;

        //属性
        private IStyleValue _styleValue;
        public IStyleValue StyleValue 
        {
            get => _styleValue;
            set
            {
                _styleValue = value;
                ChangeStyle();
            }
        }

        public event EventHandler StyleChanged;

        private StyleManager()
        {
            StyleValue = StyleConfig.GetStyleValue();
            _controlStyle = StyleConfig.GetControlStyle();
        }

        private void ChangeStyle()
        {
            foreach(var styleCtl in _styleControls)
            {
                FreshControlStyle(styleCtl);
            }
            StyleChanged?.Invoke(this, new EventArgs());
        }

        private void FreshControlStyle(Control ctl)
        {
            Dictionary<string, string> filedDir = _controlStyle.GetControlStyleDir(ctl.GetType());
            foreach (var filedPair in filedDir)
            {
                object? value = _styleValue.GetStyleFiledValue(filedPair.Value);
                SetProperty(ctl, filedPair.Key, value);
            }
        }

        private void SetProperty(Control ctl, string propertyString, object? value)
        {
            object? instance = ctl;
            PropertyInfo pInfo;

            var propertyPath = propertyString.Split(new char[] { '.'});
            foreach(var p in propertyPath)
            {
                pInfo = instance.GetType().GetProperty(p);
                if(p.Equals(propertyPath.Last()))
                    pInfo.SetValue(instance, value);
                else
                    instance = pInfo.GetValue(instance);
            }
        }

        private void SpecialSetForFloatForm(FloatForm fForm)
        {
            //判定Form是否包含NavBarGroup；不包含-改变标题栏颜色；
            Boolean hasNbgFalg = false;
            foreach(var ctl in fForm.Controls)
            {
                if (ctl is NavBarGroup)
                    hasNbgFalg = true;
            }
            if(!hasNbgFalg)
                fForm.HeadBackColor = Uni_Trend.MSO7000X.UserControls.Style.DefaultStyleValue.DefaultTitleBackColor;

            //统一为FloatForm添加边框
            if (fForm is BaseForm bForm)
            {
                bForm.BorderThickness = 2;
                bForm.BorderBackColor = bForm.HeadBackColor;
            }
        }

        /// <summary>
        /// 注册单个控件
        /// </summary>
        /// <param name="ctl"></param>
        public void RegisterControl(Control ctl)
        {
            if(!_styleControls.Contains(ctl))
            {
                _styleControls.Add(ctl);
                FreshControlStyle(ctl);
                ctl.Disposed += (o, e) => DeregisterControl(ctl);
            }
            //统一给FloatForm进行设置
            if (ctl is FloatForm fForm)
                SpecialSetForFloatForm(fForm);

            //统一给UestcSwitchButton进行设置
            if (ctl is UestcSwitchButton usBtn)
                usBtn.MouseEnter += (_, _) => usBtn.UseAnimation = true; 
        }

        /// <summary>
        /// 注册控件及其子控件及其子控件的子控件...
        /// </summary>
        /// <param name="ctl"></param>
        public void RegisterControlRecursion(Control ctl, List<Control> filtedCtls = null)
        {
            RegisterControl(ctl);
            //递归结束：1)ctl是被过滤类型的；2)ctl.Controls中控件数为0；
            if (GetDefaultFiltedControlTypes().Contains(ctl.GetType()))
                return;

            foreach (Control childCtl in ctl.Controls)
            {
                if(filtedCtls == null || !filtedCtls.Contains(childCtl))
                    RegisterControlRecursion(childCtl);
            }
        }

        private List<Type> GetDefaultFiltedControlTypes()
        {
            return new List<Type> 
            {
                typeof(UIRadioButtonGroup),
            };
        }

        void DeregisterControl(Control ctl)
        {
            _styleControls.Remove(ctl);
        }

    }
}