/*
  Copyright (C) 2005 Kimmo Pekkola

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "StdAfx.h"
#include "MeterButton.h"
#include "Measure.h"
#include "Rainmeter.h"
#include "Error.h"
#include "../Common/Gfx/Canvas.h"

using namespace Gdiplus;

enum BUTTON_STATE
{
	BUTTON_STATE_NORMAL,
	BUTTON_STATE_DOWN,
	BUTTON_STATE_HOVER
};

/*
** The constructor
**
*/
MeterButton::MeterButton(MeterWindow* meterWindow, const WCHAR* name) : Meter(meterWindow, name),
	m_Image(L"ButtonImage", nullptr, true, meterWindow),
	m_NeedsReload(false),
	m_Bitmaps(),
	m_State(BUTTON_STATE_NORMAL),
	m_Clicked(false),
	m_Focus(false)
{
}

/*
** The destructor
**
*/
MeterButton::~MeterButton()
{
	for (int i = 0; i < BUTTON_FRAMES; ++i)
	{
		delete m_Bitmaps[i];
	}
}

/*
** Load the image and get the dimensions of the meter from it.
**
*/
void MeterButton::Initialize()
{
	Meter::Initialize();

	for (int i = 0; i < BUTTON_FRAMES; ++i)
	{
		delete m_Bitmaps[i];
		m_Bitmaps[i] = nullptr;
	}

	// Load the bitmaps if defined
	if (!m_ImageName.empty())
	{
		m_Image.LoadImage(m_ImageName, m_NeedsReload);

		if (m_Image.IsLoaded())
		{
			Bitmap* bitmap = m_Image.GetImage();

			int bitmapW = bitmap->GetWidth();
			int bitmapH = bitmap->GetHeight();

			m_W = bitmapW;
			m_H = bitmapH;

			if (m_H > m_W)
			{
				m_H /= BUTTON_FRAMES;
			}
			else
			{
				m_W /= BUTTON_FRAMES;
			}

			// Separate the frames
			for (int i = 0; i < BUTTON_FRAMES; ++i)
			{
				Bitmap bitmapPart(m_W, m_H, PixelFormat32bppPARGB);
				Graphics graphics(&bitmapPart);
				Rect r(0, 0, m_W, m_H);

				if (bitmapH > bitmapW)
				{
					graphics.DrawImage(bitmap, r, 0, m_H * i, m_W, m_H, UnitPixel);
				}
				else
				{
					graphics.DrawImage(bitmap, r, m_W * i, 0, m_W, m_H, UnitPixel);
				}
				m_Bitmaps[i] = new CachedBitmap(&bitmapPart, &graphics);
			}
		}
	}
	else if (m_Image.IsLoaded())
	{
		m_Image.DisposeImage();
	}
}

/*
** Read the options specified in the ini file.
**
*/
void MeterButton::ReadOptions(ConfigParser& parser, const WCHAR* section)
{
	// Store the current values so we know if the image needs to be updated
	std::wstring oldImageName = m_ImageName;
	int oldW = m_W;
	int oldH = m_H;

	Meter::ReadOptions(parser, section);

	m_ImageName = parser.ReadString(section, L"ButtonImage", L"");
	if (!m_ImageName.empty())
	{
		// Read tinting options
		m_Image.ReadOptions(parser, section);
	}
	else
	{
		m_Image.ClearOptionFlags();
	}

	m_Command = parser.ReadString(section, L"ButtonCommand", L"", false);

	if (m_Initialized)
	{
		m_NeedsReload = (wcscmp(oldImageName.c_str(), m_ImageName.c_str()) != 0);

		if (m_NeedsReload ||
			m_Image.IsOptionsChanged())
		{
			Initialize();  // Reload the image
		}
		else
		{
			// Reset to old dimensions
			m_W = oldW;
			m_H = oldH;
		}
	}
}

/*
** Updates the value(s) from the measures.
**
*/
bool MeterButton::Update()
{
	return Meter::Update();
}

/*
** Draws the meter on the double buffer
**
*/
bool MeterButton::Draw(Gfx::Canvas& canvas)
{
	if (!Meter::Draw(canvas)) return false;

	if (m_Bitmaps[m_State] == nullptr) return false;	// Unable to continue

	Gdiplus::Graphics& graphics = canvas.BeginGdiplusContext();

	int x = GetX();
	int y = GetY();

	// Blit the image
	graphics.DrawCachedBitmap(m_Bitmaps[m_State], x, y);

	canvas.EndGdiplusContext();

	return true;
}

/*
** Overridden method. The meters need not to be bound on anything
**
*/
void MeterButton::BindMeasures(ConfigParser& parser, const WCHAR* section)
{
	BindPrimaryMeasure(parser, section, true);
}

/*
** Checks if the given point is inside the button.
**
*/
bool MeterButton::HitTest2(int px, int py, bool checkAlpha)
{
	int x = GetX();
	int y = GetY();

	if (m_MouseOver &&
		px >= x && px < x + m_W &&
		py >= y && py < y + m_H)
	{
		if (checkAlpha)
		{
			if (m_SolidColor.GetA() != 0 || m_SolidColor2.GetA() != 0)
			{
				return true;
			}

			// Check transparent pixels
			if (m_Image.IsLoaded())
			{
				Color color;
				Status status = m_Image.GetImage()->GetPixel(px - x + m_W * m_State, py - y, &color);
				if (status != Ok || color.GetA() != 0)
				{
					return true;
				}
			}
			else
			{
				return true;
			}
		}
		else
		{
			return true;
		}
	}
	return false;
}

bool MeterButton::MouseUp(POINT pos, bool execute)
{
	if (m_State == BUTTON_STATE_DOWN)
	{
		if (execute && m_Clicked && m_Focus && HitTest2(pos.x, pos.y, true))
		{
			GetRainmeter().ExecuteCommand(m_Command.c_str(), m_MeterWindow);
		}
		m_State = BUTTON_STATE_NORMAL;
		m_Clicked = false;
		return true;
	}
	m_Clicked = false;

	return false;
}

bool MeterButton::MouseDown(POINT pos)
{
	if (m_Focus && HitTest2(pos.x, pos.y, true))
	{
		m_State = BUTTON_STATE_DOWN;
		m_Clicked = true;
		return true;
	}
	return false;
}

bool MeterButton::MouseMove(POINT pos)
{
	if (m_Clicked)
	{
		if (HitTest2(pos.x, pos.y, true))
		{
			if (m_State == BUTTON_STATE_NORMAL)
			{
				m_State = BUTTON_STATE_DOWN;
				return true;
			}
		}
		else
		{
			// If the left button is not down anymore the clicked state needs to be set false
			if (!IsLButtonDown())
			{
				m_Clicked = false;
			}

			if (m_State == BUTTON_STATE_DOWN)
			{
				m_State = BUTTON_STATE_NORMAL;
				return true;
			}
		}
	}
	else
	{
		if (HitTest2(pos.x, pos.y, false))
		{
			if (m_State == BUTTON_STATE_NORMAL)
			{
				m_State = BUTTON_STATE_HOVER;
				return true;
			}
		}
		else
		{
			if (m_State == BUTTON_STATE_HOVER)
			{
				m_State = BUTTON_STATE_NORMAL;
				return true;
			}
		}
	}
	return false;
}