#include <stdio.h>

#include "PluginSys.h"

/********************

* FUNCTION CALLING *

********************/

void CFunction::Set(funcid_t funcid, CPlugin *plugin)

{

	m_funcid = funcid;

	m_pPlugin = plugin;

	m_curparam = 0;

	m_errorstate = SP_ERROR_NONE;

}

int CFunction::CallFunction(const cell_t *params, unsigned int num_params, cell_t *result)

{

	IPluginContext *ctx = m_pPlugin->m_ctx_current.base;

	while (num_params--)

	{

		ctx->PushCell(params[num_params]);

	}

	return ctx->Execute(m_funcid, result);

}

IPlugin *CFunction::GetParentPlugin()

{

	return m_pPlugin;

}

CFunction::CFunction(funcid_t funcid, CPlugin *plugin) : 

	m_funcid(funcid), m_pPlugin(plugin), m_curparam(0), 

	m_errorstate(SP_ERROR_NONE)

{

}

int CFunction::PushCell(cell_t cell)

{

	if (m_curparam >= SP_MAX_EXEC_PARAMS)

	{

		return SetError(SP_ERROR_PARAMS_MAX);

	}

	m_info[m_curparam].marked = false;

	m_params[m_curparam] = cell;

	m_curparam++;

	return SP_ERROR_NONE;

}

int CFunction::PushCellByRef(cell_t *cell, int flags)

{

	if (m_curparam >= SP_MAX_EXEC_PARAMS)

	{

		return SetError(SP_ERROR_PARAMS_MAX);

	}

	return PushArray(cell, 1, NULL, flags);

}

int CFunction::PushFloat(float number)

{

	cell_t val = *(cell_t *)&number;

	return PushCell(val);

}

int CFunction::PushFloatByRef(float *number, int flags)

{

	return PushCellByRef((cell_t *)number, flags);

}

int CFunction::PushCells(cell_t array[], unsigned int numcells, bool each)

{

	if (!each)

	{

		return PushArray(array, numcells, NULL, SMFUNC_COPYBACK_NONE);

	} else {

		int err;

		for (unsigned int i=0; i<numcells; i++)

		{

			if ((err=PushCell(array[i])) != SP_ERROR_NONE)

			{

				return SetError(err);

			}

		}

		return SP_ERROR_NONE;

	}

}

int CFunction::PushArray(cell_t *inarray, unsigned int cells, cell_t **phys_addr, int copyback)

{

	if (m_curparam >= SP_MAX_EXEC_PARAMS)

	{

		return SetError(SP_ERROR_PARAMS_MAX);

	}

	IPluginContext *ctx = m_pPlugin->m_ctx_current.base;

	ParamInfo *info = &m_info[m_curparam];

	int err;

	if ((err=ctx->HeapAlloc(cells, &info->local_addr, &info->phys_addr)) != SP_ERROR_NONE)

	{

		return SetError(err);

	}

	info->flags = inarray ? copyback : SMFUNC_COPYBACK_NONE;

	info->marked = true;

	info->size = cells;

	m_params[m_curparam] = info->local_addr;

	m_curparam++;

	if (inarray)

	{

		memcpy(info->phys_addr, inarray, sizeof(cell_t) * cells);

		info->orig_addr = inarray;

	} else {

		info->orig_addr = info->phys_addr;

	}

	if (phys_addr)

	{

		*phys_addr = info->phys_addr;

	}

	return true;

}

int CFunction::PushString(const char *string)

{

	return _PushString(string, SMFUNC_COPYBACK_NONE);

}

int CFunction::PushStringByRef(char *string, int flags)

{

	return _PushString(string, flags);

}

int CFunction::_PushString(const char *string, int flags)

{

	if (m_curparam >= SP_MAX_EXEC_PARAMS)

	{

		return SetError(SP_ERROR_PARAMS_MAX);

	}

	IPluginContext *base = m_pPlugin->m_ctx_current.base;

	ParamInfo *info = &m_info[m_curparam];

	size_t len = strlen(string);

	size_t cells = (len + sizeof(cell_t) - 1) / sizeof(cell_t);

	int err;

	if ((err=base->HeapAlloc(cells, &info->local_addr, &info->phys_addr)) != SP_ERROR_NONE)

	{

		return SetError(err);

	}

	info->marked = true;

	m_params[m_curparam] = info->local_addr;

	m_curparam++;	/* Prevent a leak */

	//:TODO: Use UTF-8 version

	if ((err=base->StringToLocal(info->local_addr, len, string)) != SP_ERROR_NONE)

	{

		return SetError(err);

	}

	info->flags = flags;

	info->orig_addr = (cell_t *)string;

	info->size = cells;

	return SP_ERROR_NONE;

}

void CFunction::Cancel()

{

	if (!m_curparam)

	{

		return;

	}

	IPluginContext *base = m_pPlugin->m_ctx_current.base;

	while (m_curparam--)

	{

		if (m_info[m_curparam].marked)

		{

			base->HeapRelease(m_info[m_curparam].local_addr);

			m_info[m_curparam].marked = false;

		}

	}

	m_errorstate = SP_ERROR_NONE;

}

int CFunction::Execute(cell_t *result, IFunctionCopybackReader *reader)

{

	int err;

	if (m_errorstate != SP_ERROR_NONE)

	{

		err = m_errorstate;

		Cancel();

		return err;

	}

	//This is for re-entrancy!

	cell_t temp_params[SP_MAX_EXEC_PARAMS];

	ParamInfo temp_info[SP_MAX_EXEC_PARAMS];

	unsigned int numparams = m_curparam;

	bool docopies = true;

	if (numparams)

	{

		//Save the info locally, then reset it for re-entrant calls.

		memcpy(temp_params, m_params, numparams * sizeof(cell_t));

		memcpy(temp_info, m_info, numparams * sizeof(ParamInfo));

	}

	m_curparam = 0;

	if ((err = CallFunction(temp_params, numparams, result)) != SP_ERROR_NONE)

	{

		docopies = false;

	}

	IPluginContext *base = m_pPlugin->m_ctx_current.base;

	while (numparams--)

	{

		if (!temp_info[numparams].marked)

		{

			continue;

		}

		if (docopies && temp_info[numparams].flags)

		{

			if (reader)

			{

				if (!reader->OnCopybackArray(numparams, 

										temp_info[numparams].size, 

										temp_info[numparams].phys_addr,

										temp_info[numparams].orig_addr,

										temp_info[numparams].flags))

				{

					goto _skipcopy;

				}

			}

			if (temp_info[numparams].orig_addr)

			{

				memcpy(temp_info[numparams].orig_addr, 

						temp_info[numparams].phys_addr, 

						temp_info[numparams].size * sizeof(cell_t));

			}

		}

_skipcopy:

		base->HeapRelease(temp_info[numparams].local_addr);

		temp_info[numparams].marked = false;

	}

	return err;

}

cell_t *CFunction::GetAddressOfPushedParam(unsigned int param)

{

	if (m_errorstate != SP_ERROR_NONE

		|| param >= m_curparam

		|| !m_info[param].marked)

	{

		return NULL;

	}

	return m_info[param].phys_addr;

}