using System;
using System.Collections.Generic;

namespace TyphoonUI
{
    /// <summary>
    /// 组件绑定
    /// </summary>
    public class BindingItem
    {
        public string Package;
        public string Script;
        public string SourceName;
        public int Priority;

        public BindingItem(string package, string script, string sourceName, int priority)
        {
            Package = package;
            Script = script;
            SourceName = sourceName;
            Priority = priority;
        }
    }

    /// <summary>
    /// 资源绑定，基类
    /// </summary>
    public abstract class AbstractBinding : IBinding
    {
        //优先级计数器
        private static int _priorityCounter = 0;
        private Dictionary<string, BindingItem> _bindings = null;
        private Dictionary<string, CanvasLayer> _panelLayers = new Dictionary<string, CanvasLayer>();

        /// <summary>
        /// 初始化
        /// </summary>
        public void Initialize()
        {
            //绑定UI资源
            Binding();
            _bindings = new Dictionary<string, BindingItem>();
            foreach (var binding in RegisterBindings)
            {
                _bindings.Add(binding.Script, binding);
            }
        }

        [NonSerialized] public List<BindingItem> RegisterBindings = new List<BindingItem>();

        public abstract void Binding();

        /// <summary>
        /// 获取面板绑定信息
        /// </summary>
        public (BindingItem, CanvasLayer) GetPanelBinding<T>() where T : UIPanel
        {
            if (_bindings == null)
            {
                throw new Exception("UIBinding未完成初始化");
            }

            var script = typeof(T).FullName;
            if (_bindings.TryGetValue(script, out var bindingItem) && _panelLayers.TryGetValue(script, out var layer))
            {
                return (bindingItem, layer);
            }

            throw new Exception($"未绑定面板类：{script}");
        }

        /// <summary>
        /// 获取组件绑定信息
        /// </summary>
        public BindingItem GetComponentBinding<T>() where T : UIComponent
        {
            if (_bindings == null)
            {
                throw new Exception("UIBinding未完成初始化");
            }

            var script = typeof(T).FullName;
            if (_bindings.TryGetValue(script, out var match))
            {
                return match;
            }

            throw new Exception($"未绑定组件类：{script}");
        }

        /// <summary>
        /// 获取层级画布面板绑定关系
        /// </summary>
        public List<BindingItem> GetLayerPanelBindingItems(CanvasLayer layer)
        {
            if (_bindings == null)
            {
                throw new Exception("UIBinding未完成初始化");
            }

            var result = new List<BindingItem>();
            foreach (var kv in _panelLayers)
            {
                var script = kv.Key;
                var temLayer = kv.Value;
                if (temLayer == layer)
                {
                    if (_bindings.TryGetValue(script, out var match))
                    {
                        result.Add(match);
                    }
                }
            }

            return result;
        }

        /// <summary>
        /// 获取面板bindingitem
        /// </summary>
        /// <param name="panelScript">面板类名（FullName）</param>
        public BindingItem GetPanelBinding(string panelScript)
        {
            if (_bindings.TryGetValue(panelScript, out var match))
            {
                return match;
            }

            return null;
        }


        /// <summary>
        /// 绑定面板组件
        /// </summary>
        /// <param name="package">包名</param>
        /// <param name="sourceName">资源名（不需要后缀）</param>
        /// <param name="layer">画布层级</param>
        /// <typeparam name="T">面板脚本类</typeparam>
        public void Bind<T>(string package, string sourceName, CanvasLayer layer) where T : UIPanel
        {
            _priorityCounter += 1;
            var script = typeof(T).FullName;
            RegisterBindings.Add(new BindingItem(package, script, sourceName, _priorityCounter));
            //关联画布层级
            _panelLayers.Add(script, layer);
        }

        /// <summary>
        /// 绑定面板组件
        /// </summary>
        /// <param name="package">归属的包名</param>
        /// <param name="sourceName">资源名（不需要后缀）</param>
        /// <typeparam name="T">组件脚本类</typeparam>
        public void Bind<T>(string package, string sourceName) where T : UIComponent
        {
            _priorityCounter += 1;
            var script = typeof(T).FullName;
            RegisterBindings.Add(new BindingItem(package, script, sourceName, _priorityCounter));
        }
    }
}