// ----------------------------------------------------------------------------
//      debug.cxx
//
// Copyright (C) 2008-2010
//              Stelios Bounanos, M0GLD
//
// This file is part of fldigi.
//
// fldigi 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 3 of the License, or
// (at your option) any later version.
//
// fldigi 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, see <http://www.gnu.org/licenses/>.
// ----------------------------------------------------------------------------

#include <config.h>

#ifdef __MINGW32__
#  include "compat.h"
#endif

#include <sstream>
#include <fstream>

#include <cstdio>
#include <cstring>
#include <cstdarg>

#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Slider.H>
#include <FL/Fl_Menu_Item.H>
#include <FL/Fl_Menu_Button.H>
#include <FL/Fl_Button.H>

#include <FL/Fl_Browser.H>

#include "debug.h"
#include "timeops.h"
#include "icons.h"
#include "gettext.h"

#include "threads.h"

#ifndef FLARQ_VERSION
#	include "fl_digi.h"
#endif

static pthread_mutex_t debug_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t debug_hd_mutex = PTHREAD_MUTEX_INITIALIZER;

extern Fl_Double_Window *fl_digi_main;
extern void update_main_title();

using namespace std;

#define MAX_LINES 65536

static FILE* wfile = 0;
static FILE* rfile = 0;
static int rfd;
static bool tty;

static Fl_Double_Window* window;
static Fl_Browser*  btext;

static string linebuf;

debug* debug::inst = 0;
debug::level_e debug::level = debug::INFO_LEVEL;
uint32_t debug::mask = ~0u;

bool debug_pskmail = false;
bool debug_audio = false;

static const char* prefix[] = {
	_("Quiet"), _("Error"), _("Warning"), _("Info"), _("Verbose"), _("Debug")
};

static void slider_cb(Fl_Widget* w, void*);
static void src_menu_cb(Fl_Widget* w, void*);

static void clear_cb(Fl_Widget *w, void*);

Fl_Menu_Item src_menu[] = {
	{ _("ARQ control"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Audio"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Modem"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Rig control"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Flrig I/O"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("RPC"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Spotter"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("KISS control"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ _("Mac Logger"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE | FL_MENU_DIVIDER },
	{ _("Other"), 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE },
	{ 0 }
};
#include <iostream>
void debug::rotate_log(const char* filename)
{
	const int n = 5; // rename existing log files to keep up to 5 old versions
	ostringstream oldfn, newfn;
	ostringstream::streampos p;

	oldfn << filename << '.';
	newfn << filename << '.';
	p = oldfn.tellp();

	for (int i = n - 1; i > 0; i--) {
		oldfn.seekp(p);
		newfn.seekp(p);
		oldfn << i;
		newfn << i + 1;
		rename(oldfn.str().c_str(), newfn.str().c_str());
	}
	rename(filename, oldfn.str().c_str());
}

void debug::start(const char* filename)
{
	if (debug::inst)
		return;
	rotate_log(filename);
	inst = new debug(filename);

	window = new Fl_Double_Window(800, 400, _("Event log"));
	window->xclass(PACKAGE_TARNAME);

	int pad = 2;
	Fl_Menu_Button* button = new Fl_Menu_Button(pad, pad, 128, 22, _("Log sources"));
	button->menu(src_menu);
	button->callback(src_menu_cb);

	Fl_Slider* slider = new Fl_Slider(button->x() + button->w() + pad, pad, 128, 22, prefix[level]);
	slider->tooltip(_("Change log level"));
	slider->align(FL_ALIGN_RIGHT);
	slider->type(FL_HOR_NICE_SLIDER);
	slider->range(0.0, LOG_NLEVELS - 1);
	slider->step(1.0);
	slider->value(level);
	slider->callback(slider_cb);

	Fl_Button* clearbtn = new Fl_Button(window->w() - 64, pad, 60, 22, "clear");
	clearbtn->callback(clear_cb);

	btext = new Fl_Browser(pad,  slider->h()+pad, window->w()-2*pad, window->h()-slider->h()-2*pad, 0);
	btext->textfont(FL_HELVETICA);
	btext->textsize(14);
	window->resizable(btext);

	window->end();
}

void debug::stop(void)
{
	guard_lock debug_lock(&debug_mutex);
	if (window) {
		window->hide();
		delete window;
		window = 0;
	}
	if (inst) {
		delete inst;
		inst = 0;
	}
}

static char fmt[1024];
static char dtext[16384];

void debug::log(level_e level, const char* func, const char* srcf, int line, const char* format, ...)
{
	guard_lock debug_lock(&debug_mutex);

	if (!inst)
		return;
	if (unlikely(debug::level == DEBUG_LEVEL) || 
		debug_pskmail || debug_audio) {
		time_t t = time(NULL);
		struct tm stm;
		(void)localtime_r(&t, &stm);
		snprintf(fmt, sizeof(fmt), "%c: [%02d:%02d:%02d] %s:%d: %s\n",
				 *prefix[level], stm.tm_hour, stm.tm_min, stm.tm_sec, srcf, line, format);
	}
	else
		snprintf(fmt, sizeof(fmt), "%c: %s: %s\n", *prefix[level], func, format);
	va_list args;
	va_start(args, format);
	intptr_t nt = vsnprintf(dtext, sizeof(dtext), fmt, args);
	va_end(args);

	fprintf(wfile, "%s", dtext);
	if (tty) {
		if (level <= DEBUG_LEVEL && level > QUIET_LEVEL) {
			fprintf(stderr, "%s", dtext);
		}
	}

#ifdef __MINGW32__
	fflush(wfile);
#endif

	linebuf.append(dtext);
	Fl::awake(sync_text, (void*)nt);
}

void debug::hex_dump(const char* func, const char * data, int length)
{
	guard_lock debug_lock(&debug_hd_mutex);

	char cbuff[32];
	char hbuff[64];
	char tbuff[32];
	int index = 0;
	int data_index = 0;
	int count = length;
	unsigned int c = 0;
	int hi = 0;
	int step = 16;

	if(!func)
		func = "Unassigned";

	if(!data || length < 0) return;

	while(count > 0) {
		memset(cbuff, 0, sizeof(cbuff));
		memset(hbuff, 0, sizeof(hbuff));
		memset(tbuff, 0, sizeof(tbuff));
		hi = 0;
		for(index = 0; index < step; index++) {
			if(data_index < length) {
				c = ((unsigned int) data[data_index]) & 0xFF;
				if(c >= ' ' && c <= 0xff) {
					cbuff[index] = c;
				} else {
					cbuff[index] = '.';
				}
				snprintf(tbuff, sizeof(tbuff) - 1, "%02X", c);
				hbuff[hi++] = tbuff[0];
				hbuff[hi++] = tbuff[1];
				hbuff[hi++] = ' ';
			} else {
				break;
			}
			data_index++;
		}
		LOG_DEBUG("%s: %s %s", func, cbuff, hbuff);
		count -= step;
	}
}

void debug::elog(const char* func, const char* srcf, int line, const char* text)
{
	log(ERROR_LEVEL, func, srcf, line, "%s: %s", text, strerror(errno));
}

void debug::show(void)
{
	btext->bottomline(btext->size());
	window->show();
}

void debug::sync_text(void* arg)
{
	guard_lock debug_lock(&debug_mutex);

	size_t p1 = 0, p2 = linebuf.find("\n");
	while (p2 != string::npos) {
		btext->add(linebuf.substr(p1, p2 - p1).c_str());
		p1 = p2 + 1;
		p2 = linebuf.find("\n", p1);
	}
	btext->redraw();
	btext->bottomline(btext->size());
	linebuf.clear();
	return;
}

debug::debug(const char* filename)
{
	if ((wfile = fopen(filename, "w")) == NULL)
		throw strerror(errno);
	setvbuf(wfile, (char*)NULL, _IOLBF, 0);
	set_cloexec(fileno(wfile), 1);

	if ((rfile = fopen(filename, "r")) == NULL)
		throw strerror(errno);
	rfd = fileno(rfile);
	set_cloexec(rfd, 1);
#ifndef __MINGW32__
	int f;
	if ((f = fcntl(rfd, F_GETFL)) == -1)
		throw strerror(errno);
	if (fcntl(rfd, F_SETFL, f | O_NONBLOCK) == -1)
		throw strerror(errno);
#endif
	tty = isatty(fileno(stderr));
	linebuf.clear();
}

debug::~debug()
{
	if (wfile) fclose(wfile);
	if (rfile) fclose(rfile);
}

static void slider_cb(Fl_Widget* w, void*)
{
	debug::level = (debug::level_e)((Fl_Slider*)w)->value();
	w->label(prefix[debug::level]);
	w->parent()->redraw();
}

static void src_menu_cb(Fl_Widget* w, void*)
{
	debug::mask ^= 1 << ((Fl_Menu_*)w)->value();
}

static void clear_cb(Fl_Widget* w, void*)
{
	guard_lock debug_lock(&debug_mutex);
	btext->clear();
	linebuf.clear();
}