//
// MessageBox.cs
//
// Author:
//       fjy <jiyuan.feng@live.com>
//
// Copyright (c) 2020 fjy
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Object = UnityEngine.Object;

namespace JEngine.Core
{
    public class MessageBox : IEnumerator
    {
        public enum EventId
        {
            Ok,
            No
        }

        private static readonly GameObject _prefab = Resources.Load<GameObject>("Prefabs/MessageBox");
        private static readonly List<MessageBox> _showed = new List<MessageBox>();
        private static readonly List<MessageBox> _hidden = new List<MessageBox>();
        private Text _content;
        private Text _textNo;
        private Text _textOk;

        private Text _title;

        private bool _visible = true;

        private MessageBox(string title, string content, string ok, string no)
        {
            gameObject = Object.Instantiate(_prefab);
            gameObject.name = title;

            _title = GetComponent<Text>("Title");
            _content = GetComponent<Text>("Content/Text");
            _textOk = GetComponent<Text>("Buttons/Ok/Text");
            _textNo = GetComponent<Text>("Buttons/No/Text");

            var ok1 = GetComponent<Button>("Buttons/Ok");
            var no1 = GetComponent<Button>("Buttons/No");
            ok1.onClick.AddListener(OnClickOk);
            no1.onClick.AddListener(OnClickNo);

            Init(title, content, ok, no);
        }

        public bool isOk { get; private set; }

        private GameObject gameObject { get; set; }

        public Action<EventId> onComplete { get; set; }

        public static void Dispose()
        {
            foreach (var item in _hidden) item.Destroy();

            _hidden.Clear();

            foreach (var item in _showed) item.Destroy();

            _showed.Clear();
        }

        public static void CloseAll()
        {
            for (var index = 0; index < _showed.Count; index++)
            {
                var messageBox = _showed[index];
                messageBox.Hide();
                _hidden.Add(messageBox);
            }

            _showed.Clear();
        }

        public static MessageBox Show(string title, string content, string ok = "确定", string no = "取消")
        {
            if (_hidden.Count > 0)
            {
                var mb = _hidden[0];
                mb.Init(title, content, ok, no);
                mb.gameObject.SetActive(true);
                _hidden.RemoveAt(0);
                return mb;
            }

            return new MessageBox(title, content, ok, no);
        }

        private void Destroy()
        {
            _title = null;
            _textOk = null;
            _textNo = null;
            _content = null;
            Object.DestroyImmediate(gameObject);
            gameObject = null;
        }

        private void Init(string title, string content, string ok, string no)
        {
            _title.text = title;
            _content.text = content;
            _textOk.text = ok;
            _textNo.text = no;
            _showed.Add(this);
            _visible = true;
            isOk = false;
        }

        private T GetComponent<T>(string path) where T : Component
        {
            var trans = gameObject.transform.Find(path);
            return trans.GetComponent<T>();
        }

        private void OnClickNo()
        {
            HandleEvent(EventId.No);
        }

        private void OnClickOk()
        {
            HandleEvent(EventId.Ok);
        }

        private void HandleEvent(EventId id)
        {
            switch (id)
            {
                case EventId.Ok:
                    break;
                case EventId.No:
                    break;
                default:
                    throw new ArgumentOutOfRangeException("id", id, null);
            }

            Close();

            isOk = id == EventId.Ok;

            if (onComplete == null) return;
            onComplete(id);
            onComplete = null;
        }

        #region IEnumerator implementation

        public bool MoveNext()
        {
            return _visible;
        }

        public void Reset()
        {
        }

        public void Close()
        {
            Hide();
            _hidden.Add(this);
            _showed.Remove(this);
        }

        private void Hide()
        {
            gameObject.SetActive(false);
            _visible = false;
        }

        public object Current => null;

        #endregion
    }
}