#include <windows.h>

#include "datalistview.h"
#include "drag.h"
#include "episodelistview.h"
#include "win32.h"
#include "window.h"

bool Dragger::IsDouble(const long time, const POINT& pt)
{
	const bool dbl = time-m_time0 <= static_cast<long>(GetDoubleClickTime())
	&& abs(pt.x-m_pt0.x) <= Metric<SM_CXDOUBLECLK>
	&& abs(pt.y-m_pt0.y) <= Metric<SM_CYDOUBLECLK>;
	m_time0 = time;
	m_pt0 = std::move(pt);
	return dbl;
}

bool Dragger::IsDown() const
{
	return GetKeyState(VK_LBUTTON) & 0x8000;
}

bool Dragger::HandleLButtonDown()
{
	POINT pt;
	if (!GetRelativeCursorPos(parent.hWnd, &pt))
		throw Err(WINDOWS, L"Mouse cursor position could not be retrieved: %s");
	if (!InDragArea(pt.x, pt.y)) return false;

	if (IsDouble(GetMessageTime(), pt)) {
		m_bActive = false;
		Reset();
	} else
		m_bActive = true;

	return m_bActive;
}

bool Dragger::HandleSetCursor()
{
	POINT pt;
	if (!GetRelativeCursorPos(parent.hWnd, &pt))
		throw Err(WINDOWS, L"Mouse cursor position could not be retrieved: %s");

	extern HCURSOR g_hcSizeNs;
	bool r = true;
	if (InDragArea(pt.x, pt.y))
		SetCursor(g_hcSizeNs);
	else
		r = false;
	if (!m_bActive)
		return r;
	Drag(pt.x, pt.y);
	if (!IsDown()) {
		m_bActive = false;
		Done();
	}
	return r;
}

bool DlvDragger::InDragArea(const int x, const int y) const
{
	RECT rrDlv;
	if (!GetRelativeRect(parent.dlv.hWnd, &rrDlv))
		throw Err(WINDOWS, L"Data list view rectangle could not be retrieved: %s");

	const int pad = EBIsThemeActive()? Dpi(6): 0;
	const int extra = EBIsThemeActive()? 0: Dpi(2);
	if (x < rrDlv.left || x > rrDlv.right) return false;
	if (y < rrDlv.top-pad*2-extra*3 || y > rrDlv.top+extra) return false;
	return true;
}

void DlvDragger::Drag(const int, const int y) const
{
	RECT rrDlv;
	if (!GetRelativeRect(parent.dlv.hWnd, &rrDlv))
		throw Err(WINDOWS, L"Data list view rectangle could not be retrieved: %s");

	if (y < Dpi(50) || y > rrDlv.bottom-Dpi(20)) return;

	int h;
	h = rrDlv.bottom-y;
	parent.dlv.SetHeight(h);
	parent.UpdateLayout();
	RedrawWindow(parent.hWnd, nullptr, nullptr,
	    RDW_ERASE|RDW_FRAME|RDW_INVALIDATE|RDW_ALLCHILDREN|RDW_UPDATENOW);
}

void DlvDragger::Reset() const
{
	parent.dlv.SetHeight(0);
	parent.cfg.heightDlv = 0;
	parent.UpdateLayout();
}

void DlvDragger::Done() const
{
	parent.cfg.heightDlv = parent.dlv.Height();
}