/* 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.
 */

/*
  ÛßÜ ÛßÜ ÜßßÜ  ßÛß Ûßß  Üß ßÛß      ÜßÛßÜ  ßÛß ÛÜ  Û ÜÛßß  ßÛß ÛßÜ Ûßß Û
  Ûß  ÛÛ  Û  Û Ü Û  Ûßß ßÜ   Û      Û  Û  Û  Û  Û ÛÜÛ  ßßßÜ  Û  ÛÛ  Ûßß Û
  ß   ß ß  ßß   ßß  ßßß   ß  ß      ß  ß  ß ßßß ß  ßß  ßßß   ß  ß ß ßßß ßßß

                 CELER            The unit for updating the screen pics. */

#define __celer_implementation__

#include "celer.h"


#include "Graph.h"
#include "trip5.h"
#include "lucerna.h"
/*#include "Crt.h"*/

namespace Avalanche {

untyped_file f; /* Private variable- not accessible from elsewhere. */

const integer on_disk = -1; /* Value of memos[fv].x when it's not in memory. */

void pics_link() {
	byte xx;

	if (ddmnow)  return; /* No animation when the menus are up. */

	{
		dnatype &with = dna;
		switch (with.room) {

		case r__outsideargentpub: {
			if ((roomtime % longint(12)) == 0)
				show_one(longint(1) + (roomtime / longint(12)) % longint(4));
		}
		break;

		case r__brummieroad:
			if ((roomtime % longint(2)) == 0)
				show_one(longint(1) + (roomtime / longint(2)) % longint(4));
			break;

		case r__bridge:
			if ((roomtime % longint(2)) == 0)
				show_one(longint(4) + (roomtime / longint(2)) % longint(4));
			break;

		case r__yours:
			if ((! with.avvy_is_awake) && ((roomtime % longint(4)) == 0))
				show_one(longint(1) + (roomtime / longint(12)) % longint(2));
			break;

		case r__argentpub: {
			if (((roomtime % longint(7)) == 1) && (dna.malagauche != 177)) {
				/* Malagauche cycle */
				dna.malagauche += 1;
				switch (dna.malagauche) {
				case 1:
				case 11:
				case 21:
					show_one(12);
					break; /* Looks forwards. */
				case 8:
				case 18:
				case 28:
				case 32:
					show_one(11);
					break; /* Looks at you. */
				case 30:
					show_one(13);
					break; /* Winks. */
				case 33:
					dna.malagauche = 0;
					break;
				}
			}

			switch (roomtime % longint(200)) {
			case 179:
			case 197:
				show_one(5);
				break; /* Dogfood's drinking cycle */
			case 182:
			case 194:
				show_one(6);
				break;
			case 185:
				show_one(7);
				break;
			case 199:
				dna.dogfoodpos = 177;
				break; /* Impossible value for this. */
			case 0 ... 178: { /* Normally. */
				switch (bearing(2)) {/* Bearing of Avvy from Dogfood. */
				case 1 ... 90:
				case RANGE_3(358, 360):
					xx = 3;
					break;
				case 293 ... 357:
					xx = 2;
					break;
				case 271 ... 292:
					xx = 4;
					break;
				}
				if (xx != dna.dogfoodpos) { /* Only if it's changed.*/
					show_one(xx);
					dna.dogfoodpos = xx;
				}
			}
			break;
			}
		}
		break;

		case r__westhall:
			if ((roomtime % longint(3)) == 0)
				switch ((roomtime / longint(3)) % longint(6)) {
				case 4:
					show_one(1);
					break;
				case 1:
				case 3:
				case 5:
					show_one(2);
					break;
				case 0:
				case 2:
					show_one(3);
					break;
				}
			break;
		case r__lustiesroom:
			if (!(dna.lustie_is_asleep))  {
				if ((roomtime % longint(45)) > 42)  xx = 4; /* du Lustie blinks */
				else
					switch (bearing(2)) {/* Bearing of Avvy from du Lustie. */
					case 0 ... 45:
					case 315 ... 360:
						xx = 1;
						break; /* Middle. */
					case 45 ... 180:
						xx = 2;
						break; /* Left. */
					case 181 ... 314:
						xx = 3;
						break; /* Right. */
					}
				if (xx != dna.dogfoodpos) { /* Only if it's changed.*/
					show_one(xx);
					dna.dogfoodpos = xx; /* We use DogfoodPos here too- why not? */
				}
			}
			break;

		case r__aylesoffice:
			if ((! dna.ayles_is_awake) && (roomtime % longint(14) == 0)) {
				switch ((roomtime / longint(14)) % longint(2)) {
				case 0:
					show_one(1);
					break; /* Frame 2: EGA. */
				case 1:
					show_one(3);
					break; /* Frame 1: Natural. */
				}
			}
			break;

		case r__robins:
			if (dna.tied_up)
				switch (roomtime % longint(54)) {
				case 20:
					show_one(4);
					break; /* Frame 4: Avalot blinks. */
				case 23:
					show_one(2);
					break; /* Frame 1: Back to normal. */
				}
			break;

		case r__nottspub: {
			switch (bearing(5)) { /* Bearing of Avvy from Port. */
			case 0 ... 45:
			case 315 ... 360:
				xx = 2;
				break; /* Middle. */
			case 45 ... 180:
				xx = 6;
				break; /* Left. */
			case 181 ... 314:
				xx = 8;
				break; /* Right. */
			}

			if ((roomtime % longint(60)) > 57)  xx -= 1; /* Blinks */

			if (xx != dna.dogfoodpos) { /* Only if it's changed.*/
				show_one(xx);
				dna.dogfoodpos = xx; /* We use DogfoodPos here too- why not? */
			}

			switch (roomtime % longint(50)) {
			case 45 :
				show_one(9);
				break; /* Spurge blinks */
			case 49 :
				show_one(10);
				break;
			}
		}
		break;

		case r__ducks: {
			if ((roomtime % longint(3)) == 0) /* The fire flickers */
				show_one(longint(1) + (roomtime / longint(3)) % longint(3));

			switch (bearing(2)) {/* Bearing of Avvy from Duck. */
			case 0 ... 45:
			case 315 ... 360:
				xx = 4;
				break; /* Middle. */
			case 45 ... 180:
				xx = 6;
				break; /* Left. */
			case 181 ... 314:
				xx = 8;
				break; /* Right. */
			}

			if ((roomtime % longint(45)) > 42)  xx += 1; /* Duck blinks */

			if (xx != dna.dogfoodpos) { /* Only if it's changed.*/
				show_one(xx);
				dna.dogfoodpos = xx; /* We use DogfoodPos here too- why not? */
			}
		}
		break;

		}
	}

	if ((dna.ringing_bells) && (flagset('B')))
		/* They're ringing the bells. */
		switch (roomtime % longint(4)) {
		case 1: {
			dnatype &with = dna;

			if (with.nextbell < 5)  with.nextbell = 12;
			with.nextbell -= 1;
			note(notes[with.nextbell]);
		}
		break;
		case 2:
			nosound;
			break;
		}

}

void load_chunks(string xx) {
	chunkblocktype ch;
	byte fv;

	/*$I-*/
	assign(f, string("chunk") + xx + ".avd"); /* strf is done for us by Lucerna. */
	reset(f, 1);
	if (ioresult != 0)  return; /* no Chunk file. */
	seek(f, 44);
	blockread(f, num_chunks, 1);
	blockread(f, offsets, num_chunks * 4);

	for (fv = 1; fv <= num_chunks; fv ++) {
		seek(f, offsets[fv]);
		blockread(f, ch, sizeof(ch));
		{
			if (ch.memorise) {

				{
					memotype &with1 = memos[fv];

					with1.x = ch.x;
					with1.xl = ch.xl;
					with1.y = ch.y;
					with1.yl = ch.yl;
					with1.flavour = ch.flavour;
					with1.size = ch.size;
				}

				getmem(memory[fv], ch.size);

				if (ch.natural) {
					getimage(ch.x * 8, ch.y, (ch.x + ch.xl) * 8, ch.y + ch.yl, memory[fv]);
				} else
					blockread(f, memory[fv], ch.size);
			} else memos[fv].x = on_disk;
		}
	}

	close(f);
	/*$I+*/
}

void forget_chunks() {
	byte fv;

	for (fv = 1; fv <= num_chunks; fv ++)
		if (memos[fv].x > on_disk)
			freemem(memory[fv], memos[fv].size);
	fillchar(memos, sizeof(memos), '\377'); /* x=-1, => on disk. */
}

void mdrop(integer x, integer y, integer xl, integer yl, pointer p) /* assembler;
asm
  push ds;      { Strictly speaking, we shouldn't modify DS, so we'll save it.}
  push bp;      { Nor BP! }


  { DI holds the offset on this page. It starts at the top left-hand corner. }
  { (It should equal ch.y*80+ch.x. }

  mov ax,y;
  mov dl,80;
  mul dl; { Line offset now calculated. }
  mov di,ax; { Move it into DI. }
  mov ax,x;
  add di,ax; { Full offset now calculated. }

  mov bx,yl; { No. of times to repeat lineloop. }
  inc bx;        { "loop" doesn't execute the zeroth time. }
  mov bh,bl;     { Put it into BH. }

  { BP holds the length of the string to copy. It's equal to ch.xl.}

  mov ax,word(p);   { Data is held at DS:SI. }
  mov si,ax;
  mov ax,word(p+2); { This will be moved over into ds in just a tick... }

  mov bp,xl;

  mov ds,ax;


  cld;          { We're allowed to hack around with the flags! }

  mov ax,$AC00; { Top of the first EGA page. }
  mov es,ax;    { Offset on this page is calculated below... }


{    port[$3c4]:=2; port[$3ce]:=4; }

  mov dx,$3c4;
  mov al,2;
  out dx,al;
  mov dx,$3ce;
  mov al,4;
  out dx,al;

  mov cx,4;  { This loop executes for 3, 2, 1, and 0. }
  mov bl,0;


 @mainloop:

    push di;
    push cx;

{    port[$3C5]:=1 shl bit; }
    mov dx,$3C5;
    mov al,1;
    mov cl,bl; { BL = bit. }
    shl al,cl;
    out dx,al;
{     port[$3CF]:=bit; }
    mov dx,$3CF;
    mov al,bl; { BL = bit. }
    out dx,al;

    xor ch,ch;
    mov cl,bh; { BH = ch.yl. }

   @lineloop:

     push cx;

     mov cx,bp;

     repz movsb; { Copy the data. }

     sub di,bp;
     add di,80;

     pop cx;

   loop @lineloop;

    inc bl; { One more on BL. }

    pop cx;
    pop di;

 loop @mainloop;

  pop bp;
  pop ds;       { Get DS back again. }
*/
{
}

void show_one(byte which);

static bytefield r;

static void display_it(integer x, integer y, integer xl, integer yl, flavourtype flavour, pointer p) {
	{
		switch (flavour) {
		case ch_bgi : {
			putimage(x * 8, y, p, 0);
			r.x1 = x;
			r.y1 = y;
			r.x2 = x + xl + 1;
			r.y2 = y + yl;
		}
		break;
		case ch_ega : {
			mdrop(x, y, xl, yl, p);
			blitfix();
			r.x1 = x;
			r.y1 = y;
			r.x2 = x + xl;
			r.y2 = y + yl;
		}
		break;
		}
	}
}

void show_one(byte which) {
	chunkblocktype ch;
	pointer p;
	byte fv;


	setactivepage(3);

	{
		memotype &with = memos[which];

		if (with.x > on_disk) {
			display_it(with.x, with.y, with.xl, with.yl, with.flavour, memory[which]);
		} else {
			reset(f, 1);
			seek(f, offsets[which]);
			blockread(f, ch, sizeof(ch));

			{
				getmem(p, ch.size);
				blockread(f, p, ch.size);

				display_it(ch.x, ch.y, ch.xl, ch.yl, ch.flavour, p);
				freemem(p, ch.size);

				close(f);
			}

		}

		setactivepage(1 - cp);

		for (fv = 0; fv <= 1; fv ++)
			getset[fv].remember(r);
	}

}

void show_one_at(byte which, integer xxx, integer yyy);

static bytefield r1;

static void display_it1(integer xl, integer yl, flavourtype flavour, pointer p, integer &xxx, integer &yyy) {
	{
		switch (flavour) {
		case ch_bgi : {
			putimage(xxx, yyy, p, 0);
			r1.x1 = xxx;
			r1.y1 = yyy;
			r1.x2 = xxx + xl + 1;
			r1.y2 = yyy + yl;
		}
		break;
		case ch_ega : {
			mdrop(xxx / 8, yyy, xl, yl, p);
			blitfix();
			r1.x1 = xxx / 8;
			r1.y1 = yyy;
			r1.x2 = (xxx / 8) + xl;
			r1.y2 = yyy + yl;
		}
		break;
		}
	}
}

void show_one_at(byte which, integer xxx, integer yyy) {
	chunkblocktype ch;
	pointer p;
	byte fv;


	setactivepage(3);

	{
		memotype &with = memos[which];

		if (with.x > on_disk) {
			display_it1(with.xl, with.yl, with.flavour, memory[which], xxx, yyy);
		} else {
			reset(f, 1);
			seek(f, offsets[which]);
			blockread(f, ch, sizeof(ch));

			{
				getmem(p, ch.size);
				blockread(f, p, ch.size);

				display_it1(ch.xl, ch.yl, ch.flavour, p, xxx, yyy);
				freemem(p, ch.size);

				close(f);
			}

		}

		setactivepage(1 - cp);

		for (fv = 0; fv <= 1; fv ++)
			getset[fv].remember(r1);
	}
}

class unit_celer_initialize {
public:
	unit_celer_initialize();
};
static unit_celer_initialize celer_constructor;

unit_celer_initialize::unit_celer_initialize() {
	num_chunks = 0;
}

} // End of namespace Avalanche.