/*-------------------------------------------------------------------------
 *
 * pragma.c
 *
 *			  pragma related code
 *
 * by Pavel Stehule 2013-2021
 *
 *-------------------------------------------------------------------------
 */

#include "plpgsql_check.h"
#include "plpgsql_check_builtins.h"

#include "utils/builtins.h"
#include "utils/array.h"

#ifdef _MSC_VER

#define strcasecmp _stricmp
#define strncasecmp _strnicmp

#endif

PG_FUNCTION_INFO_V1(plpgsql_check_pragma);

plpgsql_check_pragma_vector plpgsql_check_runtime_pragma_vector;

bool plpgsql_check_runtime_pragma_vector_changed = false;

static bool
pragma_apply(plpgsql_check_pragma_vector *pv, char *pragma_str)
{
	bool	is_valid = true;

	while (*pragma_str == ' ')
		pragma_str++;


	if (strncasecmp(pragma_str, "ECHO:", 5) == 0)
	{
		elog(NOTICE, "%s", pragma_str + 5);
	}
	else if (strncasecmp(pragma_str, "STATUS:", 7) == 0)
	{
		pragma_str += 7;

		while (*pragma_str == ' ')
			pragma_str++;

		if (strcasecmp(pragma_str, "CHECK") == 0)
			elog(NOTICE, "check is %s",
					pv->disable_check ? "disabled" : "enabled");
		else if (strcasecmp(pragma_str, "TRACER") == 0)
			elog(NOTICE, "tracer is %s",
					pv->disable_tracer ? "disabled" : "enabled");
		else if (strcasecmp(pragma_str, "OTHER_WARNINGS") == 0)
			elog(NOTICE, "other_warnings is %s",
					pv->disable_other_warnings ? "disabled" : "enabled");
		else if (strcasecmp(pragma_str, "PERFORMANCE_WARNINGS") == 0)
			elog(NOTICE, "performance_warnings is %s",
					pv->disable_performance_warnings ? "disabled" : "enabled");
		else if (strcasecmp(pragma_str, "EXTRA_WARNINGS") == 0)
			elog(NOTICE, "extra_warnings is %s",
					pv->disable_extra_warnings ? "disabled" : "enabled");
		else if (strcasecmp(pragma_str, "SECURITY_WARNINGS") == 0)
			elog(NOTICE, "security_warnings is %s",
					pv->disable_other_warnings ? "disabled" : "enabled");
		else
		{
			elog(WARNING, "unsuported pragma: %s", pragma_str);
			is_valid = false;
		}
	}
	else if (strncasecmp(pragma_str, "ENABLE:", 7) == 0)
	{
		pragma_str += 7;

		while (*pragma_str == ' ')
			pragma_str++;

		if (strcasecmp(pragma_str, "CHECK") == 0)
			pv->disable_check = false;
		else if (strcasecmp(pragma_str, "TRACER") == 0)
		{
			pv->disable_tracer = false;

#if PG_VERSION_NUM < 120000

			elog(WARNING, "pragma ENABLE:TRACER is ignored on PostgreSQL 11 and older");

#endif

		}
		else if (strcasecmp(pragma_str, "OTHER_WARNINGS") == 0)
			pv->disable_other_warnings = false;
		else if (strcasecmp(pragma_str, "PERFORMANCE_WARNINGS") == 0)
			pv->disable_performance_warnings = false;
		else if (strcasecmp(pragma_str, "EXTRA_WARNINGS") == 0)
			pv->disable_extra_warnings = false;
		else if (strcasecmp(pragma_str, "SECURITY_WARNINGS") == 0)
			pv->disable_security_warnings = false;
		else
		{
			elog(WARNING, "unsuported pragma: %s", pragma_str);
			is_valid = false;
		}
	}
	else if (strncasecmp(pragma_str, "DISABLE:", 8) == 0)
	{
		pragma_str += 8;

		while (*pragma_str == ' ')
			pragma_str++;

		if (strcasecmp(pragma_str, "CHECK") == 0)
			pv->disable_check = true;
		else if (strcasecmp(pragma_str, "TRACER") == 0)
		{
			pv->disable_tracer = true;

#if PG_VERSION_NUM < 120000

			elog(WARNING, "pragma DISABLE:TRACER is ignored on PostgreSQL 11 and older");

#endif
		}
		else if (strcasecmp(pragma_str, "OTHER_WARNINGS") == 0)
			pv->disable_other_warnings = true;
		else if (strcasecmp(pragma_str, "PERFORMANCE_WARNINGS") == 0)
			pv->disable_performance_warnings = true;
		else if (strcasecmp(pragma_str, "EXTRA_WARNINGS") == 0)
			pv->disable_extra_warnings = true;
		else if (strcasecmp(pragma_str, "SECURITY_WARNINGS") == 0)
			pv->disable_security_warnings = true;
		else
			elog(WARNING, "unsuported pragma: %s", pragma_str);
	}
	else
	{
		elog(WARNING, "unsupported pragma: %s", pragma_str);
		is_valid = false;
	}

	return is_valid;
}


/*
 * Implementation of pragma function. There are two different
 * use cases - 1) it is used for static analyze by plpgsql_check,
 * where arguments are read from parse tree.
 * 2) it is used for controlling of code tracing in runtime.
 * arguments, are processed as usual for variadic text function.
 */
Datum
plpgsql_check_pragma(PG_FUNCTION_ARGS)
{
	ArrayType *array;
	ArrayIterator iter;
	bool		isnull;
	Datum		value;

	if (PG_ARGISNULL(0))
		PG_RETURN_INT32(0);

	array = PG_GETARG_ARRAYTYPE_P(0);

	iter = array_create_iterator(array, 0, NULL);

	while (array_iterate(iter, &value, &isnull))
	{
		char	   *pragma_str;

		if (isnull)
			continue;

		pragma_str = TextDatumGetCString(value);

		pragma_apply(&plpgsql_check_runtime_pragma_vector, pragma_str);

		plpgsql_check_runtime_pragma_vector_changed = true;

		pfree(pragma_str);
	}

	array_free_iterator(iter);

	PG_RETURN_INT32(1);
}

void
plpgsql_check_pragma_apply(PLpgSQL_checkstate *cstate, char *pragma_str)
{
	if (pragma_apply(&(cstate->pragma_vector), pragma_str))
		cstate->was_pragma = true;
}