/*
 *	PROGRAM:	Event manager
 *	MODULE:		print_event.cpp
 *	DESCRIPTION:	Global region print utility
 *
 * 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): ______________________________________.
 */

#include "firebird.h"
#include "fb_types.h"
#include "../jrd/common.h"
#include "../jrd/event.h"
#include "../jrd/event_proto.h"
#include "../jrd/gds_proto.h"
#include "../common/utils_proto.h"

#define isc_print_status gds__print_status



static void prt_que(const char*, const srq*);
static void event_list();
static void event_dump_list();
static void event_table_dump();


static EVH EVENT_header = NULL;

#define SRQ_BASE ((UCHAR*) EVENT_header)

int main(int argc, char *argv[])
{
/**************************************
 *
 *	m a i n
 *
 **************************************
 *
 * Functional description
 *	This is a simple utility program to print out the current
 *	contents of the Firebird event table file.
 *
 **************************************/
	ISC_STATUS_ARRAY status_vector;

	if (!(EVENT_header = EVENT_init(status_vector)))
	{
		fprintf(stderr, "Can't access global event region\n");
		isc_print_status(status_vector);
		return 1;
	}

	if ((argc == 2) && fb_utils::strnicmp(argv[1], "-dump", MAX(strlen(argv[1]), 2)) == 0)
		event_table_dump();
	else if (argc == 1)
		event_list();
	else
		fprintf(stderr, "usage: fb_event_print [-dump]\n");

	return 0;
}


static void event_list()
{
/**************************************
 *
 *	e v e n t _ l i s t
 *
 **************************************
 *
 * Functional description
 *	List active events in the event table.
 *	This format is more readable for humans.
 *
 **************************************/
	const srq* database_que;

	SRQ_LOOP(EVENT_header->evh_events, database_que)
	{
		const evnt* database_event = (evnt*) ((UCHAR*) database_que - OFFSET(evnt*, evnt_events));

		// Skip non-database entries

		if (database_event->evnt_parent)
			continue;

		// Print out the magic name for the database, this name
		// comes from the lock key_id for the database, on Unix
		// this is comprised of the device number and inode

		printf("Database: ");
		const UCHAR* p = (UCHAR *) database_event->evnt_name;
		for (ULONG l = database_event->evnt_length; l; --l)
			printf("%02x", *p++);

		printf(" count: %6ld\n", database_event->evnt_count);

		{ // scope
			const srq* interest_que;
			// Print out the interest list for this event

			SRQ_LOOP(database_event->evnt_interests, interest_que)
			{
				const req_int* interest = (req_int*) ((UCHAR*) interest_que - OFFSET(req_int*, rint_interests));
				if (!interest->rint_request)
					printf("(0)");
				else
				{
					const evt_req* request = (evt_req*) SRQ_ABS_PTR(interest->rint_request);
					const prb* process = (prb*) SRQ_ABS_PTR(request->req_process);
					printf("%6d ", process->prb_process_id);
				}
			}
		} // scope

		// Print out each event belonging to this database

		const srq* que_inst;
		SRQ_LOOP(EVENT_header->evh_events, que_inst)
		{

			const evnt* event = (evnt*) ((UCHAR *) que_inst - OFFSET(evnt*, evnt_events));
			fb_assert(event->evnt_header.hdr_type == type_evnt);
			if (event->evnt_parent != SRQ_REL_PTR(database_event))
				continue;
			printf("    \"%-15s\" count: %6ld Interest", event->evnt_name, event->evnt_count);

			{ // scope
				const srq* interest_que;
				// Print out the interest list for this event

				SRQ_LOOP(event->evnt_interests, interest_que)
				{
					const req_int* interest = (req_int*) ((UCHAR*) interest_que - OFFSET(req_int*, rint_interests));
					if (!interest->rint_request)
						printf("(0)");
					else
					{
						const evt_req* request = (evt_req*) SRQ_ABS_PTR(interest->rint_request);
						const prb* process = (prb*) SRQ_ABS_PTR(request->req_process);
						printf("%6d ", process->prb_process_id);
					}
				}
			} // scope
			printf("\n");
		}
	}
}


static void event_table_dump()
{
/**************************************
 *
 *	e v e n t _ t a b l e _ d u m p
 *
 **************************************
 *
 * Functional description
 *	Dump the contents of the event table.
 *	This format exactly matches what's in the event table and
 *	is not very readable by humans.
 *
 **************************************/

	printf("%.5d GLOBAL REGION HEADER\n", 0);
	printf("\tLength: %ld, version: %d, free: %ld, current: %ld, request_id: %ld\n",
		 EVENT_header->evh_length, EVENT_header->evh_version,
		 EVENT_header->evh_free, EVENT_header->evh_current_process,
		 EVENT_header->evh_request_id);

	prt_que("\tProcesses", &EVENT_header->evh_processes);
	prt_que("\tEvents", &EVENT_header->evh_events);

	for (SLONG offset = sizeof(evh); offset < EVENT_header->evh_length; offset += block->hdr_length)
	{
		printf("\n%.5ld ", offset);
		const event_hdr* block = (event_hdr*) SRQ_ABS_PTR(offset);
		switch (block->hdr_type)
		{
		case type_prb:
			{
				printf("PROCESS_BLOCK (%ld)\n", block->hdr_length);
				const prb* process = (prb*) block;
				printf("\tFlags: %d, pid: %d\n", process->prb_flags, process->prb_process_id);
				prt_que("\tProcesses", &process->prb_processes);
				prt_que("\tSessions", &process->prb_sessions);
			}
			break;

		case type_frb:
			{
				printf("FREE BLOCK (%ld)\n", block->hdr_length);
				const frb* free = (frb*) block;
				printf("\tNext: %ld\n", free->frb_next);
			}
			break;

		case type_reqb:
			{
				printf("REQUEST BLOCK (%ld)\n", block->hdr_length);
				const evt_req* request = (evt_req*) block;
				printf("\tProcess: %ld, interests: %ld, ast: %lx, arg: %lx\n",
						  request->req_process, request->req_interests,
						  request->req_ast, request->req_ast_arg);
				printf("\tRequest id: %ld\n", request->req_request_id);
				prt_que("\tRequests", &request->req_requests);
			}
			break;

		case type_evnt:
			{
				printf("EVENT (%ld)\n", block->hdr_length);
				const evnt* event = (evnt*) block;
				printf("\t\"%s\", count: %ld, parent: %ld\n",
						  event->evnt_name, event->evnt_count, event->evnt_parent);
				prt_que("\tInterests", &event->evnt_interests);
				prt_que("\tEvents", &event->evnt_events);
			}
			break;

		case type_ses:
			{
				printf("SESSION (%ld)\n", block->hdr_length);
				const ses* session = (ses*) block;
				printf("\tInterests: %ld\n", session->ses_interests);
				prt_que("\tSessions", &session->ses_sessions);
				prt_que("\tRequests", &session->ses_requests);
			}
			break;

		case type_rint:
			{
				printf("INTEREST (%ld)\n", block->hdr_length);
				const req_int* interest = (req_int*) block;
				if (interest->rint_event)
				{
					const evnt* event = (evnt*) SRQ_ABS_PTR(interest->rint_event);
					if (event->evnt_parent)
					{
						const evnt* parent = (evnt*) SRQ_ABS_PTR(event->evnt_parent);
						printf("\t\"%s\".\"%s\"\n", parent->evnt_name, event->evnt_name);
					}
					else
						printf("\t\"%s\"\n", event->evnt_name);
				}
				printf("\tEvent: %ld, request: %ld, next: %ld, count: %ld\n",
						  interest->rint_event, interest->rint_request,
						  interest->rint_next, interest->rint_count);
				prt_que("\tInterests", &interest->rint_interests);
			}
			break;

		default:
			printf("*** UNKNOWN *** (%ld)\n", block->hdr_length);
			break;
		}
		if (!block->hdr_length)
			break;
	}

}


static void prt_que(const char* string, const srq* que_inst)
{
/**************************************
 *
 *	p r t _ q u e
 *
 **************************************
 *
 * Functional description
 *	Print the contents of a self-relative que.
 *
 **************************************/
	SLONG offset = SRQ_REL_PTR(que_inst);

	if (offset == que_inst->srq_forward && offset == que_inst->srq_backward)
		printf("%s: *empty*\n", string);
	else
		printf("%s: forward: %d, backward: %d\n",
				string, que_inst->srq_forward, que_inst->srq_backward);
}