/**
* @file		dl_ui_msg_box.h
* @brief	消息框
*
*
* @version	1.0
* @author	lveyou
* @date		22-05-11
*
* @note		带有标题、内容、按钮、关闭按钮的弹窗
*/
#pragma once

#ifndef DL_DISABLE_RENDER
#include "ui/dl_ui_button_sprite.h"
#include "system/dl_system.h"

namespace dl::UI
{
//! 消息框最大按钮数量
constexpr size_t NUM_MSG_BOX_BTN = 10;

//! UI消息框
class MsgBox
{
public:
	/**
	* @brief 构造
	* @param[in] bg 九图精灵作为背景
	* @param[in] txt_title 标题文本
	* @param[in] txt 内容文本
	* @param[in] btn 普通按钮
	* @param[in] btn_close 关闭按钮
	* @param[in] dx_btn 按钮（额外）间隔，艺术性调整
	* 
	* @note 应该立即调用Set设置内容
	*/
	static MsgBox* Create(
		Background* bg,
		gcText txt_title,
		gcText txt,
		UI::ButtonSprite* btn,
		UI::ButtonSprite* btn_close,
		Float dx_btn = 0.0)
	{
		MsgBox* ret = new MsgBox;
		Coor* coor = Coor::Create();
		coor->SetPosition(toPosition(g_system->GetWindowSize() / 2u));
		bg->SetUI(true);

		ret->_coor = coor;
		ret->_bg = bg;
		ret->_txtTitle = txt_title;
		ret->_txt = txt;
		ret->_btn = btn;
		ret->_btnClose = btn_close;
		ret->_dxBtn = dx_btn;
		
		ret->_refresh_coor();
		ret->SetOrder(Z_DEFAULT_UI);
		return ret;
	}

	MsgBox* Clone()
	{
		MsgBox* ret = new MsgBox(*this);
		ret->_coor = _coor->Clone();
		ret->_bg = _bg->Clone();
		ret->_btn = _btn->Clone();
		ret->_btnClose = _btnClose->Clone();
		
		for (size_t i = 0; i < _allBtn.size(); ++i)
		{
			ret->_allBtn[i] = _allBtn[i]->Clone();
		}
		ret->_refresh_coor();
		return ret;
	}

	/**
	* @brief 设置内容
	* @param[in] title 标题
	* @param[in] info 内容
	* @param[in] btns 按钮内容
	*
	*/
	void Set(std::string_view title, std::string_view info, std::vector<std::string_view> all_btn)
	{
		_txtTitle->SetString(title);
		if(_bAddTab)
			_txt->SetString(std::string{ "\t" } + std::string{ info });
		else
			_txt->SetString(info);

		//少了就新建按钮
		_numBtn = all_btn.size();
		if (_numBtn > _allBtn.size())
		{
			_allBtn.resize(_numBtn);
			for (UI::ButtonSprite*& btn : _allBtn)
			{
				if (!btn)
				{
					btn = _btn->Clone();
				}
			}
		}

		for (std::size_t i = 0; i < _numBtn; ++i)
		{
			_allBtn[i]->SetString(all_btn[i]);
		}

		//--------------------------------更新布局--------------------------------
		Float w_btn = _btn->GetSize()[0];	//按钮宽度
		Float h_btn = _btn->GetSize()[1];
		//整体宽度为 按钮宽度 + 间隔（多一个）
		Float w = w_btn * _numBtn + _dxBtn * (1 + _numBtn);

		_txt->SetMaxW(w);//设置文本宽度

		Float h_txt = _txt->GetSize()[1];	//文本高度
		Float h_title = _txtTitle->GetSize()[1];//标题高度
		//整体高度 标题 + 文本 + 按钮
		Float h = h_title + h_txt * 1 + h_btn * 1;
		_txt->SetCenter();
		Position size{ w, h };
		Position size_half{ size * 0.5f };
		_bg->SetSize(size);

		//设置位置
		_bg->GetCoor()->SetPosition(toPosition(_bg->GetOffset()) - size_half);
		_txtTitle->SetPositionAlign(-size_half, Align::LC);
		_btnClose->GetCoor()->SetPosition({ size_half[0], -size_half[1] });

		if (_numBtn > 0)
		{
			//偏移为 负的 按钮总宽度的一半（间隔少一个） + 半个按钮
			Float sx_btn = (w_btn * _numBtn + _dxBtn * (_numBtn - 1)) * -0.5_f + w_btn * 0.5_f;
			for (std::size_t i = 0; i < _numBtn; ++i)
			{
				_allBtn[i]->GetCoor()->SetPosition({ sx_btn + i * (w_btn + _dxBtn), size_half[1] });
			}
		}
			
	}
	/**
		* @brief 设置内容，以语言文件配置的名称
		*
	*/
	void Set(std::string_view str)
	{
		std::string_view str_title = lang("msg_box", std::string{ str } + "_title");
		std::string_view str_info = lang("msg_box", std::string{ str } + "_info");
		std::vector<std::string_view> all_btn;
		for (std::size_t i = 0; i < NUM_MSG_BOX_BTN; ++i)
		{
			std::string str_name = fmt::format("{}_{}", str, i);
			auto str = g_lang->GetCheck("msg_box", str_name);
			if (!str.has_value())
			{
				break;
			}
			all_btn.push_back(str.value());
		}

		Set(str_title, str_info, all_btn);
	}
		
	void Update()
	{
		_btnClose->Update();
		for (size_t i = 0; i < _numBtn; ++i)
		{
			_allBtn[i]->Update();
		}

		if (_posPick)
		{
			if (g_input->KeyUp(MouseCode::LEFT))
				_posPick.reset();
		}
		else
		{
			if (g_input->KeyDown(MouseCode::LEFT) && IsPickupTitle())
			{
				_posPick = _coor->WorldToThis(toPosition(g_input->GetCursorPosition()));
			}
		}

		//左键拖动
		if (_posPick)
		{
			Point pos = g_input->GetCursorPosition();
			_coor->SetPosition(toPosition(pos) - _posPick.value());
		}
	}

	void Render()
	{
		_bg->Render();
		_txtTitle->Render();
		_txt->Render();
	}
	/**
		* @brief 返回点击按钮索引，返回-1代表没有点击
	*/
	size_t GetClick()
	{
		for (size_t i = 0; i < _numBtn; ++i)
		{
			if (_allBtn[i]->IsClick())
				return i;
		}
		return -1;
	}
	/**
	* @brief 是否点击了关闭按钮
	*/
	bool IsClickClose()
	{
		return _btnClose->IsClick();
	}
	/**
	* @brief 是否选中标题栏
	*/
	bool IsPickupTitle()
	{
		if (_bg->IsPickup())
		{//按钮会屏蔽bg的IsPickup
			Position pos = _txtTitle->GetCoor()->WorldToThis(toPosition(g_input->GetCursorPosition()));
			if (pos[1] < _txtTitle->GetSize()[1])
				return true;
		}
		return false;
	}

	void SetOrder(float order)
	{
		_txt->SetOrder(Math::OffsetOrder(order, 0, 0, -1));
		_txtTitle->SetOrder(Math::OffsetOrder(order, 0, 0, -1));
		_btnClose->SetOrder(Math::OffsetOrder(order, 0, 0, -1));
		_btn->SetOrder(Math::OffsetOrder(order, 0, 0, -1));
		for (auto& iter : _allBtn)
		{
			iter->SetOrder(Math::OffsetOrder(order, 0, 0, -1));
		}
		_bg->SetOrder(Math::OffsetOrder(order, 0, 0, 0));
	}

	~MsgBox()
	{
		delete _coor;
		delete _bg;
		delete _btn;
		delete _btnClose;
		for (auto& iter : _allBtn)
			delete iter;
	}
private:
	MsgBox():
		_coor{nullptr},
		_bg{nullptr},
		_btn{nullptr},
		_btnClose{nullptr},
		_numBtn{0},
		_bAddTab{true}
	{}
	Coor* _coor;

	Background* _bg;
	gcText _txtTitle;
	gcText _txt;
	UI::ButtonSprite* _btn;
	UI::ButtonSprite* _btnClose;

	//动态改变长度，多余的不会自动删除，所以需要标记使用数量
	std::vector<UI::ButtonSprite*> _allBtn;
	std::size_t _numBtn;

	Float _dxBtn;

	std::optional<Position> _posPick;//被拾取位置（差值，相加即可）（直到再抬起）
	bool _bAddTab;//添加段首缩进

	void _refresh_coor()
	{
		_bg->GetCoor()->SetParent(_coor);
		_txtTitle->GetCoor()->SetParent(_coor);
		_txt->GetCoor()->SetParent(_coor);
		_btn->GetCoor()->SetParent(_coor);
		_btnClose->GetCoor()->SetParent(_coor);

		for (size_t i = 0; i < _allBtn.size(); ++i)
		{
			_allBtn[i]->GetCoor()->SetParent(_coor);
		}
	}
};
}

#endif