/*
 * dinamic.c - Cartridge handling, Dinamic cart.
 *
 * Written by
 *  Marco van den Heuvel <blackystardust68@yahoo.com>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */

#include "vice.h"

#include <stdio.h>
#include <string.h>

#define CARTRIDGE_INCLUDE_SLOTMAIN_API
#include "c64cartsystem.h"
#undef CARTRIDGE_INCLUDE_SLOTMAIN_API
#include "cartio.h"
#include "cartridge.h"
#include "dinamic.h"
#include "export.h"
#include "monitor.h"
#include "snapshot.h"
#include "types.h"
#include "util.h"
#include "crt.h"

/* #define DBGDINAMIC */

#ifdef DBGDINAMIC
#define DBG(x) printf x
#else
#define DBG(x)
#endif

/*
    Dinamic Software Game Cartridge

    - Narco Police (128k, 8k*16)
    - Satan (128k, 8k*16)

    - 16 8k ROM Banks, mapped to $8000 in 8k Game Mode

    io1:
    - banks are switched by read accesses to deXX, where XX is the bank number
*/

static int currbank = 0;

static uint8_t dinamic_io1_read(uint16_t addr)
{
    DBG(("@ $%04x io1 rd %04x (bank: %02x)\n", reg_pc, addr, addr & 0x0f));
    if ((addr & 0x0f) == addr) {
        cart_romlbank_set_slotmain(addr & 0x0f);
        cart_romhbank_set_slotmain(addr & 0x0f);
        currbank = addr & 0x0f;
    }
    return 0;
}

static uint8_t dinamic_io1_peek(uint16_t addr)
{
    return 0;
}

static int dinamic_dump(void)
{
    mon_out("Bank: %d\n", currbank);
    return 0;
}

/* ---------------------------------------------------------------------*/

static io_source_t dinamic_io1_device = {
    CARTRIDGE_NAME_DINAMIC, /* name of the device */
    IO_DETACH_CART,         /* use cartridge ID to detach the device when involved in a read-collision */
    IO_DETACH_NO_RESOURCE,  /* does not use a resource for detach */
    0xde00, 0xdeff, 0xff,   /* range for the device, regs:$de00-$de0f, unknown mirrors:$de10-$deff */
    0,                      /* reads are never valid */
    NULL,                   /* store function */
    NULL,                   /* NO poke function */
    dinamic_io1_read,       /* read function */
    dinamic_io1_peek,       /* peek function */
    dinamic_dump,           /* device state information dump function */
    CARTRIDGE_DINAMIC,      /* cartridge ID */
    IO_PRIO_NORMAL,         /* normal priority, device read needs to be checked for collisions */
    0                       /* insertion order, gets filled in by the registration function */
};

static io_source_list_t *dinamic_io1_list_item = NULL;

static const export_resource_t export_res = {
    CARTRIDGE_NAME_DINAMIC, 0, 1, &dinamic_io1_device, NULL, CARTRIDGE_DINAMIC
};

/* ---------------------------------------------------------------------*/

void dinamic_config_init(void)
{
    cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ);
}

void dinamic_config_setup(uint8_t *rawcart)
{
    memcpy(roml_banks, rawcart, 0x2000 * 16);
    cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ);
}

/* ---------------------------------------------------------------------*/

static int dinamic_common_attach(void)
{
    if (export_add(&export_res) < 0) {
        return -1;
    }
    dinamic_io1_list_item = io_source_register(&dinamic_io1_device);
    return 0;
}

int dinamic_bin_attach(const char *filename, uint8_t *rawcart)
{
    if (util_file_load(filename, rawcart, 0x20000, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) {
        return -1;
    }
    return dinamic_common_attach();
}

int dinamic_crt_attach(FILE *fd, uint8_t *rawcart)
{
    crt_chip_header_t chip;

    while (1) {
        if (crt_read_chip_header(&chip, fd)) {
            break;
        }

        if (chip.bank > 15 || chip.size != 0x2000 || chip.start != 0x8000) {
            return -1;
        }

        if (crt_read_chip(rawcart, chip.bank << 13, &chip, fd)) {
            return -1;
        }
    }

    return dinamic_common_attach();
}

void dinamic_detach(void)
{
    io_source_unregister(dinamic_io1_list_item);
    dinamic_io1_list_item = NULL;
    export_remove(&export_res);
}

/* ---------------------------------------------------------------------*/

/* CARTDINAMIC snapshot module format:

   type  | name | description
   ------------------------------
   BYTE  | bank | current bank
   ARRAY | ROML | 8192 BYTES of ROML data
 */

static const char snap_module_name[] = "CARTDINAMIC";
#define SNAP_MAJOR   0
#define SNAP_MINOR   0

int dinamic_snapshot_write_module(snapshot_t *s)
{
    snapshot_module_t *m;

    m = snapshot_module_create(s, snap_module_name, SNAP_MAJOR, SNAP_MINOR);

    if (m == NULL) {
        return -1;
    }

    if (0
        || (SMW_B(m, (uint8_t)currbank) < 0)
        || (SMW_BA(m, roml_banks, 0x2000 * 16) < 0)) {
        snapshot_module_close(m);
        return -1;
    }

    return snapshot_module_close(m);
}

int dinamic_snapshot_read_module(snapshot_t *s)
{
    uint8_t vmajor, vminor;
    snapshot_module_t *m;

    m = snapshot_module_open(s, snap_module_name, &vmajor, &vminor);

    if (m == NULL) {
        return -1;
    }

    /* Do not accept versions higher than current */
    if (snapshot_version_is_bigger(vmajor, vminor, SNAP_MAJOR, SNAP_MINOR)) {
        snapshot_set_error(SNAPSHOT_MODULE_HIGHER_VERSION);
        goto fail;
    }

    if (0
        || (SMR_B_INT(m, &currbank) < 0)
        || (SMR_BA(m, roml_banks, 0x2000 * 16) < 0)) {
        goto fail;
    }

    snapshot_module_close(m);

    return dinamic_common_attach();

fail:
    snapshot_module_close(m);
    return -1;
}
