/*
  Copyright (C) 2000 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#pragma warning(disable: 4996)

#include "Measure.h"
#include "MeasureCPU.h"
#include "MeasureMemory.h"
#include "MeasurePhysicalMemory.h"
#include "MeasureVirtualMemory.h"
#include "MeasureNetIn.h"
#include "MeasureNetOut.h"
#include "MeasureNetTotal.h"
#include "MeasureDiskSpace.h"
#include "MeasureUptime.h"
#include "MeasurePlugin.h"
#include "MeasureRegistry.h"
#include "MeasureTime.h"
#include "MeasureCalc.h"
#include "Rainmeter.h"
#include "Error.h"
#include "Litestep.h"
#include <algorithm>

const int MEDIAN_SIZE = 7;

extern CRainmeter* Rainmeter;

/*
** CMeasure
**
** The constructor
**
*/
CMeasure::CMeasure(CMeterWindow* meterWindow)
{
	m_Invert = false;
	m_LogMaxValue = false;
	m_MinValue = 0.0;
	m_MaxValue = 1.0;
	m_Value = 0.0;
	m_IfAboveValue = 0.0;
	m_IfBelowValue = 0.0;
	m_IfEqualValue = 0.0;
	m_IfAboveCommited = false;
	m_IfBelowCommited = false;
	m_IfEqualCommited = false;
	m_Disabled = false;
	m_UpdateDivider = 1;
	m_UpdateCounter = 0;
	m_MedianPos = 0;
	m_AveragePos = 0;
	m_AverageSize = 0;
	m_MeterWindow = meterWindow;
	m_DynamicVariables = false;
}

/*
** ~CMeasure
**
** The destructor
**
*/
CMeasure::~CMeasure()
{
}

/*
** ReadConfig
**
** Reads the common configs for all Measures. The inherited classes
** must call the base implementation if they overwrite this method.
** 
*/
void CMeasure::ReadConfig(CConfigParser& parser, const WCHAR* section)
{
	// Clear substitutes to prevent from being added more than once.
	if (!m_Substitute.empty())
	{
		m_Substitute.clear();
	}

	m_Invert = 0!=parser.ReadInt(section, L"InvertMeasure", 0);
	m_Disabled = 0!=parser.ReadInt(section, L"Disabled", 0);
	m_UpdateDivider = parser.ReadInt(section, L"UpdateDivider", 1);
	m_UpdateCounter = m_UpdateDivider;

	m_MinValue = parser.ReadFloat(section, L"MinValue", m_MinValue);
	m_MaxValue = parser.ReadFloat(section, L"MaxValue", m_MaxValue);

	// The ifabove/ifbelow define actions that are ran when the value goes above/below the given number.

	m_IfAboveValue = parser.ReadFloat(section, L"IfAboveValue", 0.0);
	m_IfAboveAction = parser.ReadString(section, L"IfAboveAction", L"", false);

	m_IfBelowValue = parser.ReadFloat(section, L"IfBelowValue", 0.0);
	m_IfBelowAction = parser.ReadString(section, L"IfBelowAction", L"", false);

	m_IfEqualValue = parser.ReadFloat(section, L"IfEqualValue", 0.0);
	m_IfEqualAction = parser.ReadString(section, L"IfEqualAction", L"", false);

	m_AverageSize = parser.ReadInt(section, L"AverageSize", 0);

	m_DynamicVariables = 0!=parser.ReadInt(section, L"DynamicVariables", 0);

	std::wstring subs;
	subs = parser.ReadString(section, L"Substitute", L"");
	if (!ParseSubstitute(subs))
	{
		DebugLog(L"Incorrect substitute string: %s", subs.c_str());
	}
}

/*
** CheckSubstitute
** 
** Substitutes part of the text
*/
const WCHAR* CMeasure::CheckSubstitute(const WCHAR* buffer)
{
	static std::wstring str;

	if (!m_Substitute.empty())
	{
		str = buffer;

		for (size_t i = 0; i < m_Substitute.size(); i = i + 2)
		{
			if (str.empty() && m_Substitute[i].empty())
			{
				// Empty result and empty substitute -> use second
				str = m_Substitute[i + 1];
			}
			else if (m_Substitute[i].size() > 0)
			{
				size_t start = 0;
				size_t pos = std::wstring::npos;

				do 
				{
					pos = str.find(m_Substitute[i], start);
					if (pos != std::wstring::npos)
					{
						str.replace(str.begin() + pos, str.begin() + pos + m_Substitute[i].size(), m_Substitute[i + 1]);
						start = pos + m_Substitute[i + 1].size();
					}
				} while(pos != std::wstring::npos);
			}
		}

		return str.c_str();
	}	
	else
	{
		return buffer;
	}
}

/*
** ParseSubstitute
** 
** Reads the buffer for "Name":"Value"-pairs separated with comma and
** fills the map with the parsed data.
*/
bool CMeasure::ParseSubstitute(std::wstring buffer)
{
	if (buffer.empty()) return true;	

	// Add quotes since they are removed by the GetProfileString
	buffer = L"\"" + buffer + L"\"";

	std::wstring word1;
	std::wstring word2;
	std::wstring sep;

	while (!buffer.empty())
	{
		word1 = ExtractWord(buffer);
		sep = ExtractWord(buffer);
		if (sep != L":") return false; 
		word2 = ExtractWord(buffer);

		m_Substitute.push_back(word1);
		m_Substitute.push_back(word2);

		sep = ExtractWord(buffer);
		if (!sep.empty() && sep != L",") return false; 
	}

	return true;
}

/*
** ExtractWord
**
** Returns the first word from the buffer. The word can be inside quotes.
** If not, the separators are ' ', '\t', ',' and ':'. Whitespaces are removed 
** and buffer _will_ be modified.
*/
std::wstring CMeasure::ExtractWord(std::wstring& buffer)
{
	std::wstring::size_type end = 0;
	std::wstring ret;

	if (buffer.empty()) return ret;	

	// Remove whitespaces
	std::wstring::size_type notwhite = buffer.find_first_not_of(L" \t\n");
	buffer.erase(0, notwhite);

	if (buffer[0] == L'\"')
	{
		end = 1;	// Skip the '"'
		// Quotes around the word
		while (buffer[end] != L'\"' && end < buffer.size()) end++;

		if (buffer[end] == L'\"')
		{
			ret = buffer.substr(1, end - 1);
			buffer.erase(0, end + 1);
		}
		else
		{
			// End of string reached
			ret = buffer.substr(end);
			buffer.erase(0, end);
		}
	}
	else
	{
		end = 0;
		while ((buffer[end] != L',') && (buffer[end] != L':') && (buffer[end] != L' ') && (buffer[end] != L'\t') && end < buffer.size()) end++;

		if (end == buffer.size())
		{
			// End of line reached
			ret = buffer;
			buffer.erase(0, end);
		}
		else
		{
			ret = buffer.substr(0, end + 1);	// The separator is also returned!
			buffer.erase(0, end + 1);
		}
	}
	return ret;
}


/*
** PreUpdate
**
** The base implementation of the update method. This includes the code
** that is common for all measures. This is called every time the measure 
** is updated. The inherited classes must call the base implementation if 
** they overwrite this method. If this method returns false, the update
** needs not to be done.
** 
*/
bool CMeasure::PreUpdate()
{
	if (IsDisabled()) 
	{
		m_Value = 0.0;	// Disable measures return 0 as value
		return false;
	}
	
	// Only update the counter if the divider 
	m_UpdateCounter++;
	if (m_UpdateCounter < m_UpdateDivider) return false;
	m_UpdateCounter = 0;

	// If we're logging the maximum value of the measure, check if
	// the new value is greater than the old one, and update if necessary.
	if(m_LogMaxValue)
	{
		if (m_MedianMaxValues.empty())
		{
			m_MedianMaxValues.resize(MEDIAN_SIZE, 0);
			m_MedianMinValues.resize(MEDIAN_SIZE, 0);
		}

		m_MedianMaxValues[m_MedianPos] = m_Value;
		m_MedianMinValues[m_MedianPos] = m_Value;
		m_MedianPos++;
		m_MedianPos %= MEDIAN_SIZE;

		std::vector<double> medianArray;
		
		medianArray = m_MedianMaxValues;
		std::sort(medianArray.begin(), medianArray.end());
		m_MaxValue = max(m_MaxValue, medianArray[MEDIAN_SIZE / 2]);

		medianArray = m_MedianMinValues;
		std::sort(medianArray.begin(), medianArray.end());
		m_MinValue = min(m_MinValue, medianArray[MEDIAN_SIZE / 2]);
	}

	if (m_MeterWindow)
	{
		// Check the IfEqualValue
		if(!m_IfEqualAction.empty())
		{
			if((int)m_Value == (int)m_IfEqualValue)
			{
				if(!m_IfEqualCommited)
				{
					Rainmeter->ExecuteCommand(m_IfEqualAction.c_str(), m_MeterWindow);
					m_IfEqualCommited = true;
				}
			}
			else
			{
				m_IfEqualCommited = false;
			}
		}

		// Check the IfAboveValue
		if(!m_IfAboveAction.empty())
		{
			if(m_Value > m_IfAboveValue)
			{
				if(!m_IfAboveCommited)
				{
					Rainmeter->ExecuteCommand(m_IfAboveAction.c_str(), m_MeterWindow);
					m_IfAboveCommited = true;
				}
			}
			else
			{
				m_IfAboveCommited = false;
			}
		}

		// Check the IfBelowValue
		if(!m_IfBelowAction.empty())
		{
			if(m_Value < m_IfBelowValue)
			{
				if(!m_IfBelowCommited)
				{
					Rainmeter->ExecuteCommand(m_IfBelowAction.c_str(), m_MeterWindow);
					m_IfBelowCommited = true;
				}
			}
			else
			{
				m_IfBelowCommited = false;
			}
		}
	}

	return true;
}

/*
** PostUpdate
**
** Does post measuring things to the value. All measures must call this
** after they have set the m_Value.
** 
*/
bool CMeasure::PostUpdate()
{
	if (m_AverageSize > 0)
	{
		if (m_AverageValues.size() == 0)
		{
			m_AverageValues.resize(m_AverageSize, m_Value);
		}
		m_AverageValues[m_AveragePos] = m_Value;

		m_AveragePos++;
		m_AveragePos %= m_AverageValues.size();

		// Calculate the average value
		m_Value = 0;
		for (size_t i = 0; i < m_AverageValues.size(); i++)
		{
			m_Value += m_AverageValues[i];
		}
		m_Value = m_Value / (double)m_AverageValues.size();
	}
	return true;
}

/*
** GetValue
**
** Returns the value of the measure. 
** 
*/
double CMeasure::GetValue()
{
	// Invert if so requested
	if (m_Invert)
	{
		return m_MaxValue - m_Value + m_MinValue;
	}

	return m_Value;
}

/*
** GetRelativeValue
**
** Returns the relative value of the measure (0.0 - 1.0). 
** 
*/
double CMeasure::GetRelativeValue()
{
	double value = GetValue();

	value = min(m_MaxValue, value);
	value = max(m_MinValue, value);

	value -= m_MinValue;

	return value / GetValueRange();
}

/*
** GetValueRange
**
** Returns the value range. 
** 
*/
double CMeasure::GetValueRange()
{
	return m_MaxValue - m_MinValue;
}

/*
** GetStringValue
**
** This method returns the value as text string. The actual value is
** get with GetValue() so we don't have to worry about m_Invert.
** 
** autoScale  If true, scale the value automatically to some sensible range.
** scale      The scale to use if autoScale is false.
** decimals   Number of decimals used in the value.
** percentual Return the value as % from the maximum value.
*/
const WCHAR* CMeasure::GetStringValue(bool autoScale, double scale, int decimals, bool percentual)
{
	static WCHAR buffer[MAX_LINE_LENGTH];
	static WCHAR buffer2[MAX_LINE_LENGTH];
	double theValue = GetValue();

	if(percentual)
	{
		swprintf(buffer, L"%i", (UINT)(100.0 * GetRelativeValue()));
	} 
	else if(autoScale)
	{
		GetScaledValue(decimals, theValue, buffer);
	}
	else 
	{
		if(decimals == 0)
		{
			double val = theValue * (1.0 / scale);
		    val = (val + ( (val >= 0) ? 0.5 : -0.5 ) );
			swprintf(buffer, L"%i", (UINT)val);
		}
		else
		{
			swprintf(buffer2, L"%%.%if", decimals);
			swprintf(buffer, buffer2, theValue * (1.0 / scale));
		}
	}

	return CheckSubstitute(buffer);
}

void CMeasure::GetScaledValue(int decimals, double theValue, WCHAR* buffer)
{
	WCHAR format[16];
	double value = 0;

	if(decimals == 0)
	{
		wcscpy(format, L"%.0f");
	}
	else
	{
		swprintf(format, L"%%.%if", decimals);
	}

	if(theValue > 1000.0 * 1000.0 * 1000.0 * 1000.0)
	{
		wcscat(format, L" T");
		value = theValue / 1024.0 / 1024.0 / 1024.0 / 1024.0;
	}
	else if(theValue > 1000.0 * 1000.0 * 1000.0)
	{
		wcscat(format, L" G");
		value = theValue / 1024.0 / 1024.0 / 1024.0;
	}
	else if(theValue > 1000.0 * 1000.0)
	{
		wcscat(format, L" M");
		value = theValue / 1024.0 / 1024.0;
	}
	else if(theValue > 1000.0)
	{
		wcscat(format, L" k");
		value = theValue / 1024.0;
	}
	else
	{
		value = theValue;
	}
	swprintf(buffer, format, value);
}


/*
** GetStats
**
** Returns the stats as string. The stats are shown in the About dialog.
*/
const WCHAR* CMeasure::GetStats()
{
	static std::wstring value;

	value = GetStringValue(true, 1, 1, false);

	return value.c_str();
}

/*
** Create
**
** Creates the given measure. This is the factory method for the measures.
** If new measures are implemented this method needs to be updated.
** 
*/
CMeasure* CMeasure::Create(const WCHAR* measure, CMeterWindow* meterWindow)
{
	// Comparson is caseinsensitive

	if(_wcsicmp(L"", measure) == 0)
	{
		return NULL;
	}
	else if(_wcsicmp(L"CPU", measure) == 0)
	{
		return new CMeasureCPU(meterWindow);
	} 
	else if(_wcsicmp(L"Memory", measure) == 0)
	{
		return new CMeasureMemory(meterWindow);
	}
	else if(_wcsicmp(L"NetIn", measure) == 0)
	{
		return new CMeasureNetIn(meterWindow);
	}
	else if(_wcsicmp(L"NetOut", measure) == 0)
	{
		return new CMeasureNetOut(meterWindow);
	}
	else if(_wcsicmp(L"NetTotal", measure) == 0)
	{
		return new CMeasureNetTotal(meterWindow);
	}
	else if(_wcsicmp(L"PhysicalMemory", measure) == 0)
	{
		return new CMeasurePhysicalMemory(meterWindow);
	}
	else if(_wcsicmp(L"SwapMemory", measure) == 0)
	{
		return new CMeasureVirtualMemory(meterWindow);
	}
	else if(_wcsicmp(L"FreeDiskSpace", measure) == 0)
	{
		return new CMeasureDiskSpace(meterWindow);
	}
	else if(_wcsicmp(L"Uptime", measure) == 0)
	{
		return new CMeasureUptime(meterWindow);
	}
	else if(_wcsicmp(L"Time", measure) == 0)
	{
		return new CMeasureTime(meterWindow);
	}
	else if(_wcsicmp(L"Plugin", measure) == 0)
	{
		return new CMeasurePlugin(meterWindow);
	}
	else if(_wcsicmp(L"Registry", measure) == 0)
	{
		return new CMeasureRegistry(meterWindow);
	}
	else if(_wcsicmp(L"Calc", measure) == 0)
	{
		return new CMeasureCalc(meterWindow);
	}

    // Error
    throw CError(std::wstring(L"No such measure: ") + measure, __LINE__, __FILE__);

	return NULL;
}

/*
** ExecuteBang
**
** Executes a custom bang
*/
void CMeasure::ExecuteBang(const WCHAR* args)
{
	DebugLog(L"[%s] Doesn't support this bang: %s", m_Name.c_str(), args);
}