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

	subr_misc.c

	Miscellaneous subroutine

	(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>

	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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.

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

#include <sys/wait.h>
#include <time.h>

#include "gb_common.h"
#include "gbx_subr.h"
#include "gbx_class.h"
#include "gambas.h"
#include "gbx_eval.h"
#include "gbx_date.h"
#include "gbx_archive.h"

#include "gbx_api.h"
#include "gbx_c_collection.h"
#include "gbx_c_process.h"
#include "gbx_debug.h"
#include "gbx_watch.h"
#include "gbx_math.h"


static EVAL_INTERFACE EVAL;
static CCOLLECTION *eval_env;

static void init_eval()
{
	static bool init = FALSE;
	
	if (init)
		return;
		
	COMPONENT_load(COMPONENT_create("gb.eval"));
	LIBRARY_get_interface_by_name("gb.eval", EVAL_INTERFACE_VERSION, &EVAL);
	init = TRUE;
}

void SUBR_error(void)
{
	SP->type = T_BOOLEAN;
	SP->_boolean.value = ERROR_info.code != 0 ? -1 : 0;
	SP++;
}


void SUBR_wait(void)
{
	struct timespec rem;
	double wait;
	double stop, time;

	SUBR_ENTER();

	if (NPARAM == 0)
	{
		HOOK_DEFAULT(wait, WATCH_wait)(0);
	}
	else
	{
		wait = SUBR_get_float(PARAM);
		DATE_timer(&stop, FALSE);
		stop += wait;

		for(;;)
		{
			HOOK_DEFAULT(wait, WATCH_wait)((int)(wait * 1000 + 0.5));

			if (DATE_timer(&time, FALSE))
				break;

			wait = stop - time;
			if (wait <= 0.0)
				break;
				
			rem.tv_sec = 0;
			rem.tv_nsec = 1000000;
			nanosleep(&rem, &rem);
		}
	}

	SUBR_LEAVE_VOID();
}


void SUBR_sleep(void)
{
	double wait;
	struct timespec rem;

	SUBR_ENTER_PARAM(1);

	wait = SUBR_get_float(PARAM);

	rem.tv_sec = (time_t)(int)wait;
	rem.tv_nsec = (int)(frac(wait) * 1E9);

	while (nanosleep(&rem, &rem) < 0);

	SUBR_LEAVE();
}


void SUBR_exec(void)
{
	void *cmd;
	bool wait;
	int mode;
	CPROCESS *process;
	bool ret;
	bool shell;
	char *name;

	SUBR_ENTER_PARAM(4);

	shell = (EXEC_code & 0x1F) != 0;

	if (shell)
		cmd = (void *)SUBR_get_string(PARAM);
	else
	{
		VALUE_conv(PARAM, (TYPE)CLASS_StringArray);
		cmd = (void *)(PARAM->_object.object);
	}

	if (!cmd)
		THROW(E_ARG);

	VALUE_conv(&PARAM[1], T_BOOLEAN);
	wait = PARAM[1]._boolean.value;

	VALUE_conv(&PARAM[2], T_INTEGER);
	mode = PARAM[2]._integer.value;

	name = SUBR_get_string(&PARAM[3]);

	ret = !PCODE_is_void(EXEC_code);

	if (shell)
		mode |= PM_SHELL;

	//if (!ret)
	//	mode |= PM_IGNORE;

	//STRING_ref(name); ## This should not be needed
	process = CPROCESS_create(mode, cmd, name);
	//STRING_unref(&name);

	if (wait)
	{
		OBJECT_REF(process, "subr_exec");

		CPROCESS_wait_for(process);

		if (!ret)
		{
			OBJECT_UNREF(process, "subr_exec");
		}
		else if (!process->to_string)
		{
			OBJECT_UNREF_KEEP(process, "subr_exec");
		}
	}

	if (ret)
	{
		if (process->to_string)
		{
			RETURN->type = T_STRING;
			RETURN->_string.addr = process->result;
			RETURN->_string.start = 0;
			RETURN->_string.len = STRING_length(process->result);

			STRING_unref_keep(&process->result);
			process->result = NULL;
			OBJECT_UNREF(process, "subr_exec");
		}
		else
		{
			RETURN->_object.class = CLASS_Process;
			RETURN->_object.object = process;
		}
		SUBR_LEAVE();
	}
	else
	{
		SUBR_LEAVE_VOID();
	}
}


static bool get_value(const char *sym, int len, GB_VARIANT *value)
{
	if (eval_env)
		if (!GB_CollectionGet(eval_env, sym, len, value))
			return FALSE;

	value->type = GB_T_NULL;
	return TRUE;
}

void EVAL_string(char *expr)
{
	int len;
	EXPRESSION *eval;

	init_eval();
	len = strlen(expr);
	eval_env = NULL;
	
	EVAL.New((void **)(void *)&eval, expr, len);

	if (EVAL.Compile(eval))
		goto _ERROR;

	if (!EVAL.Run(eval, get_value))
		goto _ERROR;

	goto _FREE;

_ERROR:
	EVAL.Free((void **)(void *)&eval);
	PROPAGATE();

_FREE:
	EVAL.Free((void **)(void *)&eval);

	VALUE_to_string(RETURN, &expr, &len);
	STREAM_write(CSTREAM_stream(CFILE_out), expr, len);
	STREAM_write_eol(CSTREAM_stream(CFILE_out));
	STREAM_flush(CSTREAM_stream(CFILE_out));
}

void SUBR_eval(void)
{
	char *expr;
	int len;
	EXPRESSION *eval;

	SUBR_ENTER();

	init_eval();
	SUBR_get_string_len(PARAM, &expr, &len);

	if (NPARAM == 2)
	{
		VALUE_conv(&PARAM[1], (TYPE)CLASS_Collection);
		eval_env = (CCOLLECTION *)(PARAM[1]._object.object);
	}
	else
		eval_env = NULL;

	EVAL.New((void **)(void *)&eval, expr, len);

	if (EVAL.Compile(eval))
		goto _ERROR;

	if (!EVAL.Run(eval, get_value))
		goto _ERROR;

	goto _FREE;

_ERROR:
	EVAL.Free((void **)(void *)&eval);
	PROPAGATE();

_FREE:
	EVAL.Free((void **)(void *)&eval);

	SUBR_LEAVE();
}


static TYPE conv_type(TYPE type)
{
	if (type <= T_BYTE)
		type = T_BYTE;
	/*else if (type <= T_INTEGER)
		;*/
	else if (type == T_CSTRING || type == T_NULL)
		type = T_STRING;
	else if (type >= T_OBJECT)
		type = T_OBJECT;

	return type;
}

void SUBR_array(void)
{
	TYPE type;
	int i;
	GB_ARRAY array;

	SUBR_ENTER();

	type = conv_type(PARAM[0].type);
	if (NPARAM >= 2 && conv_type(PARAM[1].type) != type)
		type = T_VARIANT;

	GB_ArrayNew(&array, type, NPARAM);

	for (i = 0; i < NPARAM; i++)
	{
		VALUE_conv(&PARAM[i], type);
		GB_Store(type, (GB_VALUE *)&PARAM[i], GB_ArrayGet(array, i));
	}

	RETURN->_object.class = OBJECT_class(array); //CLASS_Array;
	RETURN->_object.object = array;

	SUBR_LEAVE();
}