#pragma once

#include "mappresent_global.h"
#include <QWidget>

/// <summary>
/// 绘制索引
/// </summary>
struct PresentIndex {
	/// <summary>
	/// 行号
	/// </summary>
	int row = 0;
	/// <summary>
	/// 列号
	/// </summary>
	int col = 0;

	PresentIndex& operator+=(const PresentIndex& other);
	bool operator!=(const PresentIndex& other) const;
};

/// <summary>
/// 绘制选项
/// </summary>
struct PresentOption {
	/// <summary>
	/// 当前所绘制索引
	/// </summary>
	PresentIndex selfIndex;
	/// <summary>
	/// 当前绘制外缘
	/// </summary>
	QRectF selfOutline;

	bool isMouseOver = false;
	bool isSelected = false;
};

/// <summary>
/// 单元绘制委托
/// </summary>
class UnitPresentDelegate {
public:
	virtual ~UnitPresentDelegate() = default;
	/// <summary>
	/// 匹配单元类型
	/// </summary>
	/// <returns></returns>
	virtual int unitType() const = 0;
	/// <summary>
	/// 绘制本单元瓦片
	/// </summary>
	/// <param name="p"></param>
	/// <param name="option"></param>
	virtual void paint(QPainter* p, const PresentOption& option) = 0;
};

class BasicUnitDelegate : public UnitPresentDelegate {
public:
	int unitType() const override;

	void paint(QPainter* p, const PresentOption& option) override;
	QList<QPointF> endPointsGet(const QRectF &rect);
};

/// <summary>
/// 基础地图绘制
/// </summary>
class MAPPRESENT_EXPORT MapPresent : public QWidget
{
	Q_OBJECT
private:
	/// <summary>
	/// 初级区域矩形变长
	/// </summary>
	const float _primitive_region_square_len = 100;
	/// <summary>
	/// 缩放倍数
	/// </summary>
	short _scale_times = 1;
	/// <summary>
	/// 当前瓦片地图中心索引
	/// </summary>
	PresentIndex _center_index;

public:
	MapPresent(QWidget* parent = nullptr);

	/// <summary>
	/// 通过widget上定位获取绘制索引
	/// </summary>
	/// <param name="pos"></param>
	/// <returns></returns>
	PresentIndex indexGet(const QPointF& pos) const;
	/// <summary>
	/// 通过绘制索引获取指定单元外接矩形
	/// </summary>
	/// <param name="idx"></param>
	/// <returns></returns>
	QRectF outlineGet(const PresentIndex& idx) const;


protected:
	void paintEvent(QPaintEvent* ev) override;

private:
	QList<PresentIndex> siblingsGet(const PresentIndex &center, uint16_t dist=1) const;
	QList<PresentIndex> itemFills(const PresentIndex &a, const PresentIndex &b) const;
};