/*
 *	PROGRAM:	JRD Command Oriented Query Language
 *	MODULE:		proc.epp
 *	DESCRIPTION:	Procedure maintenance routines
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 *
 * 2002.10.30 Sean Leyne - Removed support for obsolete "PC_PLATFORM" define
 *
 */

#include "firebird.h"
#include <string.h>
#include "../jrd/ibase.h"
#include "../qli/dtr.h"
#include "../qli/parse.h"
#include "../qli/compile.h"
#include "../qli/err_proto.h"
#include "../qli/lex_proto.h"
#include "../qli/meta_proto.h"
#include "../qli/parse_proto.h"
#include "../qli/proc_proto.h"

DATABASE DB1 = EXTERN FILENAME "yachts.lnk";
DATABASE DB = EXTERN FILENAME "yachts.lnk";

static int clear_out_qli_procedures(DBB);
static void create_qli_procedures(DBB);
static void probe(DBB, const TEXT*);
static int upcase_name(const TEXT*, TEXT*);

static const UCHAR tpb[] =
{
	isc_tpb_version1, isc_tpb_write,
	isc_tpb_concurrency
};

static const UCHAR dyn_gdl1[] = {
#include "../qli/procddl1.h"
};
static const UCHAR dyn_gdl2[] = {
#include "../qli/procddl2.h"
};
static const UCHAR dyn_gdl3[] = {
#include "../qli/procddl3.h"
};
static const UCHAR dyn_gdl4[] = {
#include "../qli/procddl4.h"
};


void PRO_close( DBB database, FB_API_HANDLE blob)
{
/**************************************
 *
 *	P R O _ c l o s e
 *
 **************************************
 *
 * Functional description
 *	Close out an open procedure blob.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	if (database && isc_close_blob(status_vector, &blob))
		ERRQ_database_error(database, status_vector);
}


void PRO_commit( DBB database)
{
/**************************************
 *
 *	P R O _ c o m m i t
 *
 **************************************
 *
 * Functional description
 *	Commit the procedure transaction.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	if ((database->dbb_capabilities & DBB_cap_multi_trans) &&
		!(LEX_active_procedure()))
	{
		if (isc_commit_transaction(status_vector, &database->dbb_proc_trans)) {
			PRO_rollback(database);
			ERRQ_database_error(database, status_vector);
		}
	}
}


void PRO_copy_procedure(
						DBB old_database,
						const TEXT* old_name,
						DBB new_database, const TEXT* new_name)
{
/**************************************
 *
 *	P R O _ c o p y _  p r o c e d u r e
 *
 **************************************
 *
 * Functional description
 *	Create a new copy of an existing
 *	procedure.  Search databases for the
 *	existing procedure.
 *
 **************************************/
	if (!new_database)
		new_database = QLI_databases;

	FB_API_HANDLE old_blob;
	if (!old_database) {
		for (old_database = QLI_databases; old_database;
			 old_database = old_database->dbb_next)
		{
			if (old_blob = PRO_fetch_procedure(old_database, old_name))
				break;
		}
	}
	else
		old_blob = PRO_fetch_procedure(old_database, old_name);

	if (!old_blob)
		ERRQ_print_error(70, old_name, NULL, NULL, NULL, NULL);
// Msg 70 procedure \"%s\" is undefined 

	if (new_database != old_database)
		PRO_setup(new_database);

	FB_API_HANDLE new_blob = 0;
	FB_API_HANDLE store_request = 0;
	probe(new_database, new_name);

	DB1 = new_database->dbb_handle;

// create blob parameter block since procedure is a text blob

	UCHAR bpb[20];
	UCHAR* p = bpb;
	USHORT bpb_length = p - bpb;
	ISC_STATUS_ARRAY status_vector;
	TEXT buffer[255];

	STORE(REQUEST_HANDLE store_request TRANSACTION_HANDLE new_database->dbb_proc_trans)
		NEW IN DB1.QLI$PROCEDURES USING

        strcpy(NEW.QLI$PROCEDURE_NAME, new_name);
		if (isc_create_blob2(status_vector, &new_database->dbb_handle,
							  &new_database->dbb_proc_trans, &new_blob,
							  &NEW.QLI$PROCEDURE, bpb_length,
							  reinterpret_cast<const char*>(bpb)))
		{
			ERRQ_database_error(new_database, status_vector);
		}
		USHORT length;
		while (!(isc_get_segment(status_vector, &old_blob, &length,
								  sizeof(buffer), buffer)))
		{
			buffer[length] = 0;
			if (isc_put_segment(status_vector, &new_blob, length, buffer))
					ERRQ_database_error(new_database, status_vector);
		}
		PRO_close(old_database, old_blob);
		PRO_close(new_database, new_blob);
	END_STORE;

// Release the FOR and STORE requests
	isc_release_request(gds_status, &store_request);
	PRO_commit(new_database);
}


void PRO_create( DBB database, const TEXT* name)
{
/**************************************
 *
 *	P R O _ c r e a t e
 *
 **************************************
 *
 * Functional description
 *	Create a new procedure, assuming, of course, it doesn't already
 *	exist.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;
	UCHAR bpb[20];

// See if procedure is already in use

	probe(database, name);

	FB_API_HANDLE blob = 0;
	const SLONG start = QLI_token->tok_position;
	SLONG stop = start;

	UCHAR* p = bpb;

	USHORT bpb_length = p - bpb;

	PRO_setup(database);

/* Store record in QLI$PROCEDURES.  Eat tokens until we run into
   END_PROCEDURE, then have LEX store the procedure in blobs. */

	STORE(REQUEST_HANDLE database->dbb_store_blob) X IN DB.QLI$PROCEDURES
		isc_vtof(name, X.QLI$PROCEDURE_NAME, sizeof(X.QLI$PROCEDURE_NAME));

		if (isc_create_blob2(status_vector, &database->dbb_handle, &gds_trans,
							  &blob, &X.QLI$PROCEDURE, bpb_length,
							  reinterpret_cast<const char*>(bpb)))
		{
			ERRQ_database_error(database, status_vector);
		}
		while (!MATCH(KW_END_PROCEDURE)) {
			if (QLI_token->tok_type == tok_eof)
				SYNTAX_ERROR(350);
			if (QLI_token->tok_type != tok_eol)
				stop = QLI_token->tok_position + QLI_token->tok_length;
			LEX_token();
		}

		LEX_put_procedure(blob, start, stop);
		isc_close_blob(status_vector, &blob);
	END_STORE;

// Commit the procedure transaction, if there is one

	PRO_commit(database);
}


int PRO_delete_procedure( DBB database, const TEXT* name)
{
/**************************************
 *
 *	P R O _ d e l e t e _ p r o c e d u r e
 *
 **************************************
 *
 * Functional description
 *	Delete a procedure.
 *
 **************************************/
	FB_API_HANDLE request = 0;
	USHORT count = 0;

	PRO_setup(database);

	FOR(REQUEST_HANDLE request) X IN DB.QLI$PROCEDURES WITH
		X.QLI$PROCEDURE_NAME EQ name
        ERASE X;
		count++;
	END_FOR;

	isc_release_request(gds_status, &request);

// Commit the procedure transaction, if there is one

	PRO_commit(database);

	return count;
}


void PRO_edit_procedure( DBB database, const TEXT* name)
{
/**************************************
 *
 *	P R O _ e d i t _ p r o c e d u r e
 *
 **************************************
 *
 * Functional description
 *	Edit a procedure, using the token stream to get the name of
 *	the procedure.
 *
 **************************************/

	PRO_setup(database);

	FOR(REQUEST_HANDLE database->dbb_edit_blob) X IN DB.QLI$PROCEDURES WITH
		X.QLI$PROCEDURE_NAME EQ name
		MODIFY X USING
			if (!BLOB_edit(&X.QLI$PROCEDURE, database->dbb_handle,
						   gds_trans, name))
			{
				return;
			}
		END_MODIFY
		PRO_commit(database);
		return;
	END_FOR

	STORE(REQUEST_HANDLE database->dbb_edit_store) X IN DB.QLI$PROCEDURES
		X.QLI$PROCEDURE = gds_blob_null;
		if (!BLOB_edit(&X.QLI$PROCEDURE, database->dbb_handle,
					   gds_trans, name))
		{
			return;
		}
		isc_vtof(name, X.QLI$PROCEDURE_NAME, sizeof(X.QLI$PROCEDURE_NAME));
	END_STORE

// Commit the procedure transaction, if there is one

	PRO_commit(database);
}


FB_API_HANDLE PRO_fetch_procedure( DBB database, const TEXT* proc)
{
/**************************************
 *
 *	P R O _ f e t c h _ p r o c e d u r e
 *
 **************************************
 *
 * Functional description
 *	Fetch a procedure.  Look up a name and return an open blob.
 *	If the name doesn't exit, return NULL.
 *
 **************************************/
	TEXT name[32];

	upcase_name(proc, name);
	PRO_setup(database);
	FB_API_HANDLE blob = 0;

	FOR(REQUEST_HANDLE database->dbb_lookup_blob) X IN DB.QLI$PROCEDURES WITH
		X.QLI$PROCEDURE_NAME EQ name
        blob = PRO_open_blob(database, &X.QLI$PROCEDURE);
	END_FOR

	return blob;
}


bool PRO_get_line(FB_API_HANDLE blob,
				  TEXT* buffer,
				  USHORT size)
{
/**************************************
 *
 *	P R O _ g e t _ l i n e
 *
 **************************************
 *
 * Functional description
 *	Get the next segment of procedure blob.  If there are
 *	no more segments, return false.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;
	USHORT length;

	isc_get_segment(status_vector, &blob, &length, size, buffer);

	if (status_vector[1] && status_vector[1] != isc_segment)
		return false;

	TEXT* p = buffer + length;

	if (p[-1] != '\n' && !status_vector[1])
		*p++ = '\n';

	*p = 0;

	return true;
}


void PRO_invoke( DBB database, const TEXT* name)
{
/**************************************
 *
 *	P R O _ i n v o k e
 *
 **************************************
 *
 * Functional description
 *	Invoke a procedure.  The qualified procedure
 *	block may include the database we want, or
 *	we may have to loop through databases.  Whatever...
 *
 **************************************/
	FB_API_HANDLE blob = 0;
	if (database) {
		if (!(blob = PRO_fetch_procedure(database, name)))
		{
			ERRQ_print_error(71, name, database->dbb_symbol->sym_string, NULL,
							 NULL, NULL);
		}
// Msg 71 procedure \"%s\" is undefined in database %s 
	}
	else
		for (database = QLI_databases; database;
			 database = database->dbb_next)
		{
			if (blob = PRO_fetch_procedure(database, name))
				break;
		}

	if (!blob)
		ERRQ_print_error(72, name, NULL, NULL, NULL, NULL);
// Msg 72 procedure \"%s\" is undefined 

	LEX_procedure((dbb*)database, blob);
	LEX_token();
}


FB_API_HANDLE PRO_open_blob( DBB database, ISC_QUAD* blob_id)
{
/**************************************
 *
 *	P R O _ o p e n _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Open a procedure blob.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;
	UCHAR bpb[20];

	FB_API_HANDLE blob = 0;
	UCHAR* p = bpb;

	USHORT bpb_length = p - bpb;

	if (isc_open_blob2(status_vector, &database->dbb_handle,
						&database->dbb_proc_trans, &blob, blob_id,
						bpb_length, bpb))
	{
		ERRQ_database_error(database, status_vector);
	}

	return blob;
}


int PRO_rename_procedure( DBB database, const TEXT* old_name, const TEXT* new_name)
{
/**************************************
 *
 *	P R O _ r e n a m e _ p r o c e d u r e
 *
 **************************************
 *
 * Functional description
 *	Change the name of a procedure.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	FB_API_HANDLE request = 0;
	PRO_setup(database);

	probe(database, new_name);

	USHORT count = 0;
	FOR(REQUEST_HANDLE request) X IN DB.QLI$PROCEDURES WITH
		X.QLI$PROCEDURE_NAME EQ old_name count++;
		MODIFY X USING
			isc_vtof(new_name, X.QLI$PROCEDURE_NAME, sizeof(X.QLI$PROCEDURE_NAME));
		END_MODIFY
		ON_ERROR
			isc_release_request(gds_status, &request);
			ERRQ_database_error(database, status_vector);
		END_ERROR;
	END_FOR;

	isc_release_request(gds_status, &request);

// Commit the procedure transaction, if there is one

	PRO_commit(database);

	return count;
}


void PRO_rollback( DBB database)
{
/**************************************
 *
 *	P R O _ r o l l b a c k
 *
 **************************************
 *
 * Functional description
 *	Rollback the procedure transaction,
 *	if there is one.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	if (database->dbb_capabilities & DBB_cap_multi_trans) {
		isc_rollback_transaction(status_vector, &database->dbb_proc_trans);

		gds_trans = 0;
	}
}


void PRO_scan( DBB database, extract_fn_t routine, void* arg)
{
/**************************************
 *
 *	P R O _ s c a n
 *
 **************************************
 *
 * Functional description
 *	Loop thru procedures calling given routine.
 *
 **************************************/
	PRO_setup(database);

	FOR(REQUEST_HANDLE database->dbb_scan_blobs) X IN DB.QLI$PROCEDURES
		SORTED BY X.QLI$PROCEDURE_NAME

        TEXT* p = X.QLI$PROCEDURE_NAME;
        // This loop didn't have any effect. However, the logic can't handle
        // dialect 3 names. At least it's now correct for dialect 1.
		while (*p && *p != ' ') {
			p++;
		}
        (*routine) (arg, X.QLI$PROCEDURE_NAME, p - X.QLI$PROCEDURE_NAME,
			database, &X.QLI$PROCEDURE);
	END_FOR
}


void PRO_setup( DBB dbb)
{
/**************************************
 *
 *	 P R O _ s e t u p
 *
 **************************************
 *
 * Functional description
 *	Prepare for a DML operation on a database.  Start a procedure
 *	transaction is one hasn't been started and the database
 *	system will start multiple transactions.  Otherwise use
 *	the default transaction.
 *
 **************************************/

	if (!dbb)
		IBERROR(77);
// Msg 77 database handle required

// If we don't have a QLI$PROCEDURES relation, and can't get one, punt 

	if (dbb->dbb_type == isc_info_db_impl_rdb_vms &&
		!(dbb->dbb_flags & DBB_procedures))
	{
		IBERROR(78);
	}
// Msg 78 QLI$PROCEDURES relation must be created with RDO in Rdb/VMS databases 

	DB = dbb->dbb_handle;

	if (dbb->dbb_flags & DBB_procedures) {
		gds_trans = PRO_transaction(dbb, false);
		return;
	}

// Sigh.  Relation doesn't exist.  So make it exist.

	create_qli_procedures(dbb);

	gds_trans = PRO_transaction(dbb, false);
}


FB_API_HANDLE PRO_transaction( DBB database, bool update_flag)
{
/**************************************
 *
 *	P R O _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Setup transaction for procedure or form operation.
 *
 *	In any event, we will set up the met_transaction because
 *	it's widely used and somebody is going to forget to test
 *	that the database is multi_transaction before using it.
 *	We have to be careful about committing or rolling back
 *	because we ould affect user data.
 *
 **************************************/
	if (!database)
		IBERROR(248);			// Msg248 no active database for operation

	FB_API_HANDLE transaction = (database->dbb_capabilities & DBB_cap_multi_trans) ?
		database->dbb_proc_trans : 0;

	DB = database->dbb_handle;

/* If we don't know whether or not the database can handle
   multiple transactions, find out now */

	ISC_STATUS_ARRAY status_vector;
	if (!transaction &&
		((database->dbb_capabilities & DBB_cap_multi_trans) ||
		 !(database->dbb_capabilities & DBB_cap_single_trans)))
	{
		if (isc_start_transaction(status_vector, &transaction, 1,
								   &database->dbb_handle, sizeof(tpb), tpb))
		{
			database->dbb_capabilities |= DBB_cap_single_trans;
		}
		else
			database->dbb_capabilities |= DBB_cap_multi_trans;
	}

// If we already have a procedure transaction, there's more nothing to do

	gds_trans = transaction;

// If we only support a single transaction, use the data transaction

	if (!gds_trans && (database->dbb_capabilities & DBB_cap_single_trans)) {
		if (update_flag)
			IBERROR(249);		// Msg249 Interactive metadata updates are not available on Rdb
		if (!(gds_trans = database->dbb_transaction))
			gds_trans = MET_transaction(nod_start_trans, database);
	}

// otherwise make one more effort to start the transaction

	else if (!gds_trans) {
		START_TRANSACTION
		ON_ERROR
			ERRQ_database_error(database, status_vector);
		END_ERROR;
	}

	database->dbb_proc_trans = gds_trans;

	return gds_trans;
}


static int clear_out_qli_procedures( DBB dbb)
{
/**************************************
 *
 *	c l e a r _ o u t  _ q l i _ p r o c e d u r e s
 *
 **************************************
 *
 * Functional description
 *	The procedures relation can't be found.  Poke
 *	around and delete any trash lying around.
 *	Before cleaning out the trash, see if somebody
 *	else has set up for us.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	FB_API_HANDLE req = 0;
	int count = 0;

	FOR(REQUEST_HANDLE req) R IN DB.RDB$RELATIONS CROSS
		F IN DB.RDB$FIELDS CROSS RFR IN DB.RDB$RELATION_FIELDS WITH
			RFR.RDB$RELATION_NAME = R.RDB$RELATION_NAME AND
			RFR.RDB$FIELD_NAME = F.RDB$FIELD_NAME AND
			R.RDB$RELATION_NAME = "QLI$PROCEDURES"
        count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(status_vector, &req);

	if (count >= 2) {
		dbb->dbb_flags |= DBB_procedures;
		return 0;
	}

	count = 0;

	FOR(REQUEST_HANDLE req) X IN DB.RDB$INDICES
	WITH X.RDB$INDEX_NAME = "QLI$PROCEDURES_IDX1"
		ERASE X;
		count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(status_vector, &req);

	FOR(REQUEST_HANDLE req) X IN DB.RDB$INDEX_SEGMENTS
	WITH X.RDB$INDEX_NAME = "QLI$PROCEDURES_IDX1"
		ERASE X;
		count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(status_vector, &req);

	FOR(REQUEST_HANDLE req) X IN DB.RDB$RELATION_FIELDS
		WITH X.RDB$FIELD_NAME = "QLI$PROCEDURE_NAME" OR
			X.RDB$FIELD_NAME = "QLI$PROCEDURE"
        ERASE X;
		count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(gds_status, &req);

	FOR(REQUEST_HANDLE req) X IN DB.RDB$FIELDS
		WITH X.RDB$FIELD_NAME = "QLI$PROCEDURE_NAME" OR
			X.RDB$FIELD_NAME = "QLI$PROCEDURE"
        ERASE X;
		count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(gds_status, &req);

	FOR(REQUEST_HANDLE req) X IN DB.RDB$RELATIONS
		WITH X.RDB$RELATION_NAME = "QLI$PROCEDURES"
        ERASE X;
		count++;
	END_FOR
	ON_ERROR
		isc_release_request(status_vector, &req);
		ERRQ_database_error(dbb, gds_status);
	END_ERROR;
	isc_release_request(gds_status, &req);

	return count;
}


static void create_qli_procedures( DBB dbb)
{
/**************************************
 *
 *	c r e a t e _ q l i _ p r o c e d u r e s
 *
 **************************************
 *
 * Functional description
 *	The procedures relation can't be found.  Clean
 *      out residual trash and (re)create the relation.
 *	Before cleaning out the trash, see if somebody
 *	else has set up for us.
 *
 **************************************/

	gds_trans = PRO_transaction(dbb, true);

	if (clear_out_qli_procedures(dbb)) {
		PRO_commit(dbb);
		gds_trans = PRO_transaction(dbb, true);
	}

	if (dbb->dbb_flags & DBB_procedures)
		return;

	if (isc_ddl(gds_status, &DB, &gds_trans, sizeof(dyn_gdl1),
				 reinterpret_cast<const char*>(dyn_gdl1)))
	{
		PRO_rollback(dbb);
		IBERROR(73);
		// Msg 73 Could not create QLI$PROCEDURE_NAME field 
	}

	if (isc_ddl(gds_status, &DB, &gds_trans, sizeof(dyn_gdl2),
				 reinterpret_cast<const char*>(dyn_gdl2)))
	{
		PRO_rollback(dbb);
		IBERROR(74);
		// Msg 74 Could not create QLI$PROCEDURE field 
	}

	if (isc_ddl(gds_status, &DB, &gds_trans, sizeof(dyn_gdl3),
				 reinterpret_cast<const char*>(dyn_gdl3)))
	{
		PRO_rollback(dbb);
		IBERROR(75);
		// Msg 75 Could not create QLI$PROCEDURES relation 
	}

	if (isc_ddl(gds_status, &DB, &gds_trans, sizeof(dyn_gdl4),
				 reinterpret_cast<const char*>(dyn_gdl4)))
	{
		PRO_rollback(dbb);
		IBERROR(409);
		// msg 409  Could not create QLI$PROCEDURES index 
	}

	dbb->dbb_flags |= DBB_procedures;
	PRO_commit(dbb);
}


static void probe( DBB database, const TEXT* name)
{
/**************************************
 *
 *	p r o b e
 *
 **************************************
 *
 * Functional description
 *	Check whether a procedure name is already in
 *	use in a particular database.  IBERROR and don't
 *	return if it is.
 *
 **************************************/
// Probe to see if procedure is already in use

	FB_API_HANDLE blob = PRO_fetch_procedure(database, name);
	if (blob) {
		ISC_STATUS_ARRAY status_vector;
		isc_close_blob(status_vector, &blob);
		ERRQ_print_error(76, name, database->dbb_symbol->sym_string, NULL,
						 NULL, NULL);
		// Msg 76 procedure name \"%s\" in use in database %s
	}
}


static int upcase_name(const TEXT* name, TEXT* buffer)
{
/**************************************
 *
 *	u p c a s e _ n a m e
 *
 **************************************
 *
 * Functional description
 *	Upcase a null terminated string and return its length.  If the
 *	length is greater than 31 bytes, barf.
 *
 **************************************/
	USHORT l = 0;

	while (true) {
		const TEXT c = *name++;
		*buffer++ = UPPER(c);
		if (!c)
			return l;
		if (++l > 31)
			IBERROR(79);		// Msg 79 procedure name over 31 characters

	}
}