/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 2
 * of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

/*
 * This code is based on the original source code of Lord Avalot d'Argent version 1.3.
 * Copyright (c) 1994-1995 Mike, Mark and Thomas Thurman.
 */

/*$M 6000,600,600*/
/*$V-,I-,R-,F+*/ /* Do not change these directives. */
#include "graph.h"
/*#include "Crt.h"*/
/*#include "Dos.h"*/
/*#include "Tsru.h"*/

namespace Avalanche {

/* program's signature */
const varying_string<20> tsr_tmark = "FISH FISH FISH!!!";

integer gd, gm;
byte a /*absolute $A000:0*/;
matrix<1, 800, 0, 3, byte> sv;
byte bit;
string nam;
byte tsr_int;
word tsr_ax;

void grab() {
	for (bit = 0; bit <= 3; bit ++) {
		port[0x3c4] = 2;
		port[0x3ce] = 4;
		port[0x3c5] = 1 << bit;
		port[0x3cf] = bit;
		move(a, sv[1][bit], 800);
	}
}

void drop() {
	for (bit = 0; bit <= 3; bit ++) {
		port[0x3c4] = 2;
		port[0x3ce] = 4;
		port[0x3c5] = 1 << bit;
		port[0x3cf] = bit;
		move(sv[1][bit], a, 800);
	}
}

void say(string x) {
	grab();
	output << string('\15') + x;
}

void pak(string x) {
	char r;
	say(x + " (press any key...)");
	r = readkey();
	drop();
}

string typein() {
	char r;
	string x;
	string typein_result;
	x = "";
	do {
		r = readkey();
		switch (r) {
		case '\10':
			if (x[0] > '\0')  {
				output << string('\10') + '\40' + '\10';
				x[0] -= 1;
			}
			break;
		case '\15': {
			typein_result = x;
			return typein_result;
		}
		break;
		case '\33': {
			typein_result = "";
			return typein_result;
		}
		break;
		default:
			if (x[0] < '\62')  {
				x = x + r;
				output << r;
			}
		}
	} while (!false);
	return typein_result;
}

void load() {
	byte a /*absolute $A000:1200*/;
	untyped_file f;
	say("LOAD: filename?");
	nam = typein();
	drop();
	if (nam == "")  return;
	assign(f, nam);
	reset(f, 1);
	if (ioresult != 0) {
		pak("LOAD: file not found.");
		return;
	}
	seek(f, 177);
	for (bit = 0; bit <= 3; bit ++) {
		port[0x3c4] = 2;
		port[0x3ce] = 4;
		port[0x3c5] = 1 << bit;
		port[0x3cf] = bit;
		blockread(f, a, 12080);
		if (ioresult != 0) {
			pak("LOAD: error whilst loading.");
			close(f);
			return;
		}
	}
	close(f);
}

void save() {
	const string header =
	    string("This is a file from an Avvy game, and its contents are subject to ") +
	    "copyright." + '\15' + '\12' + '\15' + '\12' + "Have fun!" + '\32';
	untyped_file f;
	varying_string<30> screenname;
	searchrec s;
	char r;
	byte a /*absolute $A000:1200*/;
	say("SAVE: filename?");
	nam = typein();
	drop();
	if (nam == "")  return;
	findfirst(nam, anyfile, s);
	if (doserror == 0) {
		say("SAVE: That exists, are you sure\? (Y/N)");
		do {
			r = upcase(readkey());
		} while (!(set::of('Y', 'N', eos).has(r)));
		drop();
		if (r == 'N')  return;
	}
	screenname = "Saved with HIZ.";
	assign(f, nam);
	rewrite(f, 1);
	blockwrite(f, header[1], 146);
	blockwrite(f, screenname, 31);
	for (bit = 0; bit <= 3; bit ++) {
		port[0x3c4] = 2;
		port[0x3ce] = 4;
		port[0x3c5] = 1 << bit;
		port[0x3cf] = bit;
		blockwrite(f, a, 12080);
		if (ioresult != 0) {
			pak("SAVE: error whilst saving.");
			close(f);
			return;
		}
	}
}

void hedges() {
	for (bit = 0; bit <= 3; bit ++) {
		port[0x3c4] = 2;
		port[0x3ce] = 4;
		port[0x3c5] = 1 << bit;
		port[0x3cf] = bit;
		fillchar(mem[0xa000 * 14 * 80], 80, '\377');
		fillchar(mem[0xa000 * 166 * 80], 80, '\377');
	}
}

void reset_() {
	registers regs;
	regs.ax = 14;
	intr(0x10, regs);
	directvideo = false;
}

void do_pop() {
	char r;
	do {
		say("HIZ: Load Save Hedges Reset eXit?");
		r = upcase(readkey());
		drop();
		switch (r) {
		case 'L':
			load();
			break;
		case 'S':
			save();
			break;
		case 'H':
			hedges();
			break;
		case 'R':
			reset_();
			break;
		case 'X':
			return;
			break;
		}
	} while (!false);
}

/* Now for the TSR stuff */

void mypoprtn() {
	registers r;
	beginpop;
	do_pop();
	endpop;
}
/**********************/
void stop_tsr() {
	if (tsrexit)
		output << "HIZ stopped" << NL;
	else
		output << "Unable to stop HIZ - other TSR has been installed." << NL;
}
/**********************/
/* This interrupt is called at program start-up. Its purpose is to provide
 a way to communicate with an installed copy of the TSR through cmdline
 params. The installation of the intrpt serves to prevent any attempt to
 install a 2nd copy of the TSR */
void tsr_intrtn(word flags, word cs, word ip, word ax, word bx, word cx, word dx, word si, word di, word ds, word es, word bp)
/*interrupt;*/
{
	tsr_ax = ax;
	cli;
	beginint;
	sti;

	switch (tsr_ax) {
	case 1: {
		stop_tsr(); /* Terminate TSR, if poss.*/
	}
	break;
	case 2: {
		tsroff = true; /* Suspend TSR */
		output << "HIZ suspended." << NL;
	}
	break;
	case 3: {
		tsroff = false;
		output << "HIZ restarted" << NL;
	}
	break;
	}
	cli;
	endint;
	sti;
}
/*******************/
byte i;
registers r;
string st;
boolean b;

int main(int argc, const char *argv[]) {
	pio_initialize(argc, argv);

	/********************************************/
	/* Check to see if TSR is already installed */
	/********************************************/

	tsr_int = dupcheck(tsr_tmark, &tsr_intrtn);

	/*****************************************/
	/* If it IS already installed, check for */
	/* parameter.                            */
	/*****************************************/

	if (tsr_int > 0) {
		if (paramcount > 0) {
			st = paramstr(1);
			for (i = 1; i <= length(st); i ++)
				st[i] = upcase(st[i]);
			if (st == "STOP")
				r.ax = 1;
			else if (st == "HOLD")  r.ax = 2;
			else if (st == "RSTR")  r.ax = 3;
			else r.ax = 4;

			if (r.ax < 4) {
				intr(tsr_int, r);
				return 0;
			} else {
				output << "HIZ: invalid parameter " << paramstr(1) << NL;
				output << "Syntax: HIZ stop/hold/rstr" << NL;
				return 0;
			}
		} else {
			output << "HIZ already installed." << NL;
			output << "(If you're sure it isn't, try running BLANKINT /I." << NL;
			output << "It's in the TURBO directory.)" << NL;
		}
		return 0;
	}

	output << string("Wait...") + '\15'; /* tell 'em to wait...! */

	/* Call PopSetUp to point to PopUp routine. Include the
	  scancode and the keymask to activate the program. In
	  this example, the scancode is $23 (H) and the
	  keymask is 08h (Alt.) */

	popsetup(&mypoprtn, 0x23, 0x8);

	directvideo = false;
	output << "Û Û ßÛß ßßÛ v1.0, (c) 1992, Thomas Thurman." << NL;
	output << "ÛßÛ  Û  Üß" << NL;
	output << "ß ß ßßß ßßß The AVD saving/loading/hedging program." << NL;
	output << "            Use with Dr. Genius. The Hot Key is Ctrl-Alt-H." << NL;

	output << NL;
	output << " Enter \"HIZ stop\" to remove Hiz from memory" << NL;
	output << "       \"HIZ hold\" to temporarily halt Hiz" << NL;
	output << "       \"HIZ rstr\" to restart Hiz" << NL;
	stacksw = -1;
	install_int;
	keep(0);
	return EXIT_SUCCESS;
}

} // End of namespace Avalanche.