/*
Copyright (c) 2013, iRacing.com Motorsport Simulations, LLC.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
	* Redistributions of source code must retain the above copyright
	  notice, this list of conditions and the following disclaimer.
	* Redistributions in binary form must reproduce the above copyright
	  notice, this list of conditions and the following disclaimer in the
	  documentation and/or other materials provided with the distribution.
	* Neither the name of iRacing.com Motorsport Simulations nor the
	  names of its contributors may be used to endorse or promote products
	  derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdio.h>
#include <string.h>

#include <assert.h>
#include "./irsdk_defines.h"
#include "./yaml_parser.h"
#include "./irsdk_client.h"

#pragma warning(disable:4996)

irsdkClient& irsdkClient::instance()
{
	static irsdkClient INSTANCE;
	return INSTANCE;
}

bool irsdkClient::waitForData(int timeoutMS)
{
	// wait for start of session or new data
	if (irsdk_waitForDataReady(timeoutMS, m_data) && irsdk_getHeader())
	{
		// if new connection, or data changed lenght then init
		if (!m_data || m_nData != irsdk_getHeader()->bufLen)
		{
			// allocate memory to hold incoming data from sim
			if (m_data) delete[] m_data;
			m_nData = irsdk_getHeader()->bufLen;
			m_data = new char[m_nData];

			// indicate a new connection
			m_statusID++;

			// reset session info str status
			m_lastSessionCt = -1;

			// and try to fill in the data
			if (irsdk_getNewData(m_data))
				return true;
		}
		else if (m_data)
		{
			// else we are allready initialized, and data is ready for processing
			return true;
		}
	}
	else if (!isConnected())
	{
		// else session ended
		if (m_data)
			delete[] m_data;
		m_data = NULL;

		// reset session info str status
		m_lastSessionCt = -1;
	}

	return false;
}

void irsdkClient::shutdown()
{
	irsdk_shutdown();
	if (m_data)
		delete[] m_data;
	m_data = NULL;

	// reset session info str status
	m_lastSessionCt = -1;
}

bool irsdkClient::isConnected()
{
	return m_data != NULL && irsdk_isConnected();
}

int irsdkClient::getVarIdx(const char* name)
{
	if (isConnected())
	{
		return irsdk_varNameToIndex(name);
	}

	return -1;
}

int /*irsdk_VarType*/ irsdkClient::getVarType(int idx)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			return vh->type;
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return irsdk_char;
}

int irsdkClient::getVarCount(int idx)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			return vh->count;
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return 0;
}

bool irsdkClient::getVarBool(int idx, int entry)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			if (entry >= 0 && entry < vh->count)
			{
				const char* data = m_data + vh->offset;
				switch (vh->type)
				{
					// 1 byte
				case irsdk_char:
				case irsdk_bool:
					return (((const char*)data)[entry]) != 0;
					break;

					// 4 bytes
				case irsdk_int:
				case irsdk_bitField:
					return (((const int*)data)[entry]) != 0;
					break;

					// test float/double for greater than 1.0 so that
					// we have a chance of this being usefull
					// technically there is no right conversion...
				case irsdk_float:
					return (((const float*)data)[entry]) >= 1.0f;
					break;

					// 8 bytes
				case irsdk_double:
					return (((const double*)data)[entry]) >= 1.0;
					break;
				}
			}
			else
			{
				// invalid offset
				assert(false);
			}
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return false;
}

int irsdkClient::getVarInt(int idx, int entry)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			if (entry >= 0 && entry < vh->count)
			{
				const char* data = m_data + vh->offset;
				switch (vh->type)
				{
					// 1 byte
				case irsdk_char:
				case irsdk_bool:
					return (int)(((const char*)data)[entry]);
					break;

					// 4 bytes
				case irsdk_int:
				case irsdk_bitField:
					return (int)(((const int*)data)[entry]);
					break;

				case irsdk_float:
					return (int)(((const float*)data)[entry]);
					break;

					// 8 bytes
				case irsdk_double:
					return (int)(((const double*)data)[entry]);
					break;
				}
			}
			else
			{
				// invalid offset
				assert(false);
			}
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return 0;
}

float irsdkClient::getVarFloat(int idx, int entry)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			if (entry >= 0 && entry < vh->count)
			{
				const char* data = m_data + vh->offset;
				switch (vh->type)
				{
					// 1 byte
				case irsdk_char:
				case irsdk_bool:
					return (float)(((const char*)data)[entry]);
					break;

					// 4 bytes
				case irsdk_int:
				case irsdk_bitField:
					return (float)(((const int*)data)[entry]);
					break;

				case irsdk_float:
					return (float)(((const float*)data)[entry]);
					break;

					// 8 bytes
				case irsdk_double:
					return (float)(((const double*)data)[entry]);
					break;
				}
			}
			else
			{
				// invalid offset
				assert(false);
			}
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return 0.0f;
}

double irsdkClient::getVarDouble(int idx, int entry)
{
	if (isConnected())
	{
		const irsdk_varHeader* vh = irsdk_getVarHeaderEntry(idx);
		if (vh)
		{
			if (entry >= 0 && entry < vh->count)
			{
				const char* data = m_data + vh->offset;
				switch (vh->type)
				{
					// 1 byte
				case irsdk_char:
				case irsdk_bool:
					return (double)(((const char*)data)[entry]);
					break;

					// 4 bytes
				case irsdk_int:
				case irsdk_bitField:
					return (double)(((const int*)data)[entry]);
					break;

				case irsdk_float:
					return (double)(((const float*)data)[entry]);
					break;

					// 8 bytes
				case irsdk_double:
					return (double)(((const double*)data)[entry]);
					break;
				}
			}
			else
			{
				// invalid offset
				assert(false);
			}
		}
		else
		{
			//invalid variable index
			assert(false);
		}
	}

	return 0.0;
}

//path is in the form of "DriverInfo:Drivers:CarIdx:{%d}UserName:"
int irsdkClient::getSessionStrVal(const char* path, char* val, int valLen)
{
	if (isConnected() && path && val && valLen > 0)
	{
		// track changes in string
		m_lastSessionCt = getSessionCt();

		const char* tVal = NULL;
		int tValLen = 0;
		if (parseYaml(irsdk_getSessionInfoStr(), path, &tVal, &tValLen))
		{
			// dont overflow out buffer
			int len = tValLen;
			if (len > (valLen - 1)) // reserve space for null termination
				len = (valLen - 1);

			// copy what we can, even if buffer too small
			memcpy(val, tVal, len);
			val[len] = '\0'; // origional string has no null termination...

			// if buffer was big enough, return success
			if ((valLen - 1) >= tValLen)
				return 1;
			else // return size of buffer needed
				return -(tValLen + 1);
		}
	}

	return 0;
}

// get the whole string
const char* irsdkClient::getSessionStr()
{
	if (isConnected())
	{
		m_lastSessionCt = getSessionCt();
		return irsdk_getSessionInfoStr();
	}

	return NULL;
}


//----------------------------------

irsdkCVar::irsdkCVar()
	: m_idx(-1)
	, m_statusID(-1)
{
	m_name[0] = '\0';
}

irsdkCVar::irsdkCVar(const char* name)
{
	m_name[0] = '\0';
	setVarName(name);
}

void irsdkCVar::setVarName(const char* name)
{
	if (!name || 0 != strncmp(name, m_name, sizeof(m_name)))
	{
		m_idx = -1;
		m_statusID = -1;

		if (name)
		{
			strncpy(m_name, name, max_string);
			m_name[max_string - 1] = '\0';
		}
		else
			m_name[0] = '\0';
	}
}

bool irsdkCVar::checkIdx()
{
	if (irsdkClient::instance().isConnected())
	{
		if (m_statusID != irsdkClient::instance().getStatusID())
		{
			m_statusID = irsdkClient::instance().getStatusID();
			m_idx = irsdkClient::instance().getVarIdx(m_name);
		}

		return true;
	}

	return false;
}

int /*irsdk_VarType*/ irsdkCVar::getType()
{
	if (checkIdx())
		return irsdkClient::instance().getVarType(m_idx);
	return 0;
}

int irsdkCVar::getCount()
{
	if (checkIdx())
		return irsdkClient::instance().getVarCount(m_idx);
	return 0;
}

bool irsdkCVar::isValid()
{
	checkIdx();
	return (m_idx > -1);
}


bool irsdkCVar::getBool(int entry)
{
	if (checkIdx())
		return irsdkClient::instance().getVarBool(m_idx, entry);
	return false;
}

int irsdkCVar::getInt(int entry)
{
	if (checkIdx())
		return irsdkClient::instance().getVarInt(m_idx, entry);
	return 0;
}

float irsdkCVar::getFloat(int entry)
{
	if (checkIdx())
		return irsdkClient::instance().getVarFloat(m_idx, entry);
	return 0.0f;
}

double irsdkCVar::getDouble(int entry)
{
	if (checkIdx())
		return irsdkClient::instance().getVarDouble(m_idx, entry);
	return 0.0;
}