/*
 * resources.c - Resource (setting) handling for VICE.
 *
 * Written by
 *  Ettore Perazzoli <ettore@comm2000.it>
 *  Andreas Boose <viceteam@t-online.de>
 *
 * 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.
 *
 */

/* This implements simple facilities to handle the resources and command-line
   options.  All the resources for the emulators can be stored in a single
   file, and they are separated by an `emulator identifier', i.e. the machine
   name between brackets (e.g. ``[C64]'').  All the resources are stored in
   the form ``ResourceName=ResourceValue'', and separated by newline
   characters.  Leading and trailing spaces are removed from the
   ResourceValue unless it is put between quotes (").  */

#include "vice.h"

/* #define VICE_DEBUG_RESOURCES */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include "archdep.h"
#include "cartridge.h"
#include "lib.h"
#include "log.h"
#include "network.h"
#include "util.h"
#include "uiapi.h"
#include "vice-event.h"

#include "resources.h"


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


/** \brief  Initial size of the array holding resources
 */
#define NUM_ALLOCATED_RESOURCES_INIT    512


typedef struct resource_ram_s {
    /* Resource name.  */
    char *name;

    /* Type of resource.  */
    resource_type_t type;

    /* Factory default value.  */
    resource_value_t factory_value;

    /* Is the resource important for history recording or netplay? */
    resource_event_relevant_t event_relevant;

    /* Value that is needed for correct history recording and netplay.  */
    resource_value_t *event_strict_value;

    /* Pointer to the value.  This is only used for *reading* it.  To change
       it, use `set_func'.  */
    resource_value_t *value_ptr;

    /* Function to call to set the integer value.  */
    resource_set_func_int_t *set_func_int;

    /* Function to call to set the string value.  */
    resource_set_func_string_t *set_func_string;

    /* Extra parameter to pass to `set_func'.  */
    void *param;

    /* callback function vector chain */
    struct resource_callback_desc_s *callback;

    /* number of next entry in hash collision list */
    int hash_next;
} resource_ram_t;


/* the type of the callback vector chain */
typedef struct resource_callback_desc_s {
    resource_callback_func_t *func;
    void *param;
    struct resource_callback_desc_s *next;
} resource_callback_desc_t;


static unsigned int num_resources;
static unsigned int num_allocated_resources;
static resource_ram_t *resources;
static char *machine_id = NULL;

static void write_resource_item(FILE *f, int num);
static char *string_resource_item(int num, const char *delim);

/* use a hash table with 1024 entries */
static const unsigned int logHashSize = 10;

static int *hashTable = NULL;

static resource_callback_desc_t *resource_modified_callback = NULL;

/* calculate the hash key */
static unsigned int resources_calc_hash_key(const char *name)
{
    unsigned int key, i, shift;

    DBG(("resources_calc_hash_key: '%s'\n", name ? name : "<empty/null>"));

    key = 0; shift = 0;
    for (i = 0; name[i] != '\0'; i++) {
        /* resources are case-insensitive */
        unsigned int sym = (unsigned int)tolower((int)name[i]);

        if (shift >= logHashSize) {
            shift = 0;
        }

        key ^= (sym << shift);
        if (shift + 8 > logHashSize) {
            key ^= (((unsigned int)sym) >> (logHashSize - shift));
        }
        shift++;
    }
    return (key & ((1 << logHashSize) - 1));
}


/* add a new callback function at the head of the vector chain */
static void resources_add_callback(resource_callback_desc_t **where,
                                   resource_callback_func_t *callback,
                                   void *param)
{
    if (callback != NULL) {
        resource_callback_desc_t *cbd;

        cbd = lib_malloc(sizeof(resource_callback_desc_t));
        cbd->func = callback;
        cbd->param = param;
        cbd->next = *where;
        *where = cbd;
    }
}


/* execute a callback vector chain */
static void resources_exec_callback_chain(const resource_callback_desc_t
                                          *callbacks, const char *name)
{
    const resource_callback_desc_t *cbd = callbacks;

    while (cbd != NULL) {
        (*cbd->func)(name, cbd->param);
        cbd = cbd->next;
    }
}


/* issue callbacks for a modified resource */
static void resources_issue_callback(resource_ram_t *res, int global_callback)
{
    if (res->callback != NULL) {
        resources_exec_callback_chain(res->callback, res->name);
    }

    if ((global_callback != 0) && (resource_modified_callback != NULL)) {
        resources_exec_callback_chain(resource_modified_callback, res->name);
    }
}


#if 0
/* for debugging (hash collisions, hash chains, ...) */
static void resources_check_hash_table(FILE *f)
{
    int i, entries;

    for (i = 0, entries = 0; i < (1 << logHashSize); i++) {
        if (hashTable[i] >= 0) {
            int next;

            fprintf(f, "%d: %s", i, resources[hashTable[i]].name);
            next = resources[hashTable[i]].hash_next;
            while (next >= 0) {
                fprintf(f, " -> %s", resources[next].name);
                next = resources[next].hash_next;
            }
            fprintf(f, "\n");
            entries++;
        }
    }
    fprintf(f, "NUM %d, ENTIES %d\n", num_resources, entries);
}
#endif

static resource_ram_t *lookup(const char *name)
{
    resource_ram_t *res;
    unsigned int hashkey;

    DBG(("lookup name:'%s'\n", name ? name : "<empty/null>"));

    if (name == NULL) {
        return NULL;
    }
    hashkey = resources_calc_hash_key(name);
    res = (hashTable[hashkey] >= 0) ? resources + hashTable[hashkey] : NULL;
    while (res != NULL) {
        if (util_strcasecmp(res->name, name) == 0) {
            return res;
        }
        res = (res->hash_next >= 0) ? resources + res->hash_next : NULL;
    }
    return NULL;
}

/* Configuration filename set via -config */
char *vice_config_file = NULL;

/* ------------------------------------------------------------------------- */
/* register an array(!) of integer resources */
int resources_register_int(const resource_int_t *r)
{
    const resource_int_t *sp;
    resource_ram_t *dp;

    DBG(("resources_register_int name:'%s'\n", r->name ? r->name : "<empty/null>"));

    sp = r;
    dp = resources + num_resources;
    while (sp->name != NULL) {
        unsigned int hashkey;

        if (sp->value_ptr == NULL || sp->set_func == NULL) {
            archdep_startup_log_error(
                "Inconsistent resource declaration '%s'.\n", sp->name);
            return -1;
        }

        if (lookup(sp->name)) {
            archdep_startup_log_error(
                "Duplicated resource declaration '%s'.\n", sp->name);
            return -1;
        }

        if (num_allocated_resources <= num_resources) {
            num_allocated_resources *= 2;
            resources = lib_realloc(resources, num_allocated_resources
                                    * sizeof(resource_ram_t));
            dp = resources + num_resources;
        }

        dp->name = lib_strdup(sp->name);
        dp->type = RES_INTEGER;
        dp->factory_value = uint_to_void_ptr(sp->factory_value);
        dp->value_ptr = (void *)(sp->value_ptr);
        dp->event_relevant = sp->event_relevant;
        dp->event_strict_value = sp->event_strict_value;
        dp->set_func_int = sp->set_func;
        dp->param = sp->param;
        dp->callback = NULL;

        hashkey = resources_calc_hash_key(sp->name);
        dp->hash_next = hashTable[hashkey];
        hashTable[hashkey] = (int)(dp - resources);

        num_resources++;
        sp++;
        dp++;
    }

    return 0;
}

int resources_register_string(const resource_string_t *r)
{
    const resource_string_t *sp;
    resource_ram_t *dp;

    DBG(("resources_register_string name:'%s'\n", r->name ? r->name : "<empty/null>"));

    sp = r;
    dp = resources + num_resources;
    while (sp->name != NULL) {
        unsigned int hashkey;

        if (sp->factory_value == NULL
            || sp->value_ptr == NULL || sp->set_func == NULL) {
            archdep_startup_log_error(
                "Inconsistent resource declaration '%s'.\n", sp->name);
            return -1;
        }

        if (lookup(sp->name)) {
            archdep_startup_log_error(
                "Duplicated resource declaration '%s'.\n", sp->name);
            return -1;
        }

        if (num_allocated_resources <= num_resources) {
            num_allocated_resources *= 2;
            resources = lib_realloc(resources, num_allocated_resources
                                    * sizeof(resource_ram_t));
            dp = resources + num_resources;
        }

        dp->name = lib_strdup(sp->name);
        dp->type = RES_STRING;
        dp->factory_value = (resource_value_t)(sp->factory_value);
        dp->value_ptr = (void *)(sp->value_ptr);
        dp->event_relevant = sp->event_relevant;
        dp->event_strict_value = sp->event_strict_value;
        dp->set_func_string = sp->set_func;
        dp->param = sp->param;
        dp->callback = NULL;

        hashkey = resources_calc_hash_key(sp->name);
        dp->hash_next = hashTable[hashkey];
        hashTable[hashkey] = (int)(dp - resources);

        num_resources++;
        sp++;
        dp++;
    }

    return 0;
}


static void resources_free(void)
{
    unsigned int i;

    for (i = 0; i < num_resources; i++) {
        lib_free((resources + i)->name);
    }
}


/** \brief  Shutdown resources
 */
void resources_shutdown(void)
{
    resources_free();

    lib_free(resources);
    lib_free(hashTable);
    lib_free(machine_id);
    lib_free(vice_config_file);
}

resource_type_t resources_query_type(const char *name)
{
    resource_ram_t *res;

    if ((res = lookup(name)) != NULL) {
        return res->type;
    } else {
        return (resource_type_t)-1;
    }
}

int resources_write_item_to_file(FILE *fp, const char *name)
{
    resource_ram_t *res = lookup(name);

    if (res != NULL) {
        write_resource_item(fp, (int)(res - resources));
        return 0;
    }
    log_warning(LOG_DEFAULT, "Trying to save unknown resource '%s'", name);

    return -1;
}

char *resources_write_item_to_string(const char *name, const char *delim)
{
    resource_ram_t *res = lookup(name);

    if (res != NULL) {
        return string_resource_item((int)(res - resources), delim);
    }

    log_warning(LOG_DEFAULT, "Trying to save unknown resource '%s'", name);

    return NULL;
}

static void resource_create_event_data(char **event_data, int *data_size,
                                       resource_ram_t *r,
                                       resource_value_t value)
{
    int name_size;
    const char *name = r->name;

    name_size = (int)strlen(name) + 1;

    if (r->type == RES_INTEGER) {
        *data_size = name_size + sizeof(uint32_t);
    } else {
        *data_size = name_size + (int)strlen((char *)value) + 1;
    }

    *event_data = lib_malloc(*data_size);
    strcpy(*event_data, name);

    if (r->type == RES_INTEGER) {
        *(uint32_t *)(*event_data + name_size) = vice_ptr_to_uint(value);
    } else {
        strcpy(*event_data + name_size, (char *)value);
    }
}

static void resource_record_event(resource_ram_t *r,
                                  resource_value_t value)
{
    char *event_data;
    int data_size;

    resource_create_event_data(&event_data, &data_size, r, value);

    network_event_record(EVENT_RESOURCE, event_data, data_size);

    lib_free(event_data);
}

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


/* Total resources registered per emu, using Gtk3 (2020-02-24)
 *
 * x128         509
 * x64sc        471
 * x64          469
 * xscpu64      445
 * xvic         364
 * xplus4       321
 * x64dtv       309
 * xpet         300
 * xcbm2        284
 * xcbm5x0      272
 * vsid         63
 */


/** \brief  Initialize resources module
 *
 * Allocated memory for resource objects and the hash table.
 *
 * \param[in]   machine machine name
 *
 * \return  0
 */
int resources_init(const char *machine)
{
    unsigned int i;

    machine_id = lib_strdup(machine);
    num_allocated_resources = NUM_ALLOCATED_RESOURCES_INIT;
    num_resources = 0;
    resources = lib_malloc(num_allocated_resources * sizeof(resource_ram_t));

    /* hash table maps hash keys to index in resources array rather than
       pointers into the array because the array may be reallocated. */
    hashTable = lib_malloc((1 << logHashSize) * sizeof(int));

    for (i = 0; i < (unsigned int)(1 << logHashSize); i++) {
        hashTable[i] = -1;
    }

    return 0;
}

static int resources_set_value_internal(resource_ram_t *r,
                                        resource_value_t value)
{
    int status = 0;

    switch (r->type) {
        case RES_INTEGER:
            status = (*r->set_func_int)(vice_ptr_to_int(value), r->param);
            break;
        case RES_STRING:
            status = (*r->set_func_string)((const char *)value, r->param);
            break;
    }

    if (status != 0) {
        resources_issue_callback(r, 1);
    }

    return status;
}

int resources_set_value(const char *name, resource_value_t value)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign value to unknown "
                    "resource `%s'.", name);
        return -1;
    }

    if (r->event_relevant == RES_EVENT_STRICT
        && network_get_mode() != NETWORK_IDLE) {
        return -2;
    }

    if (r->event_relevant == RES_EVENT_SAME && network_connected()) {
        resource_record_event(r, value);
        return 0;
    }

    return resources_set_value_internal(r, value);
}

static int resources_set_internal_int(resource_ram_t *r, int value)
{
    int status = 0;

    switch (r->type) {
        case RES_INTEGER:
            status = (*r->set_func_int)(value, r->param);
            break;
        default:
            return -1;
    }

    if (status != 0) {
        resources_issue_callback(r, 1);
    }

    return status;
}

static int resources_set_internal_string(resource_ram_t *r,
                                         const char *value)
{
    int status = 0;

    switch (r->type) {
        case RES_STRING:
            status = (*r->set_func_string)(value, r->param);
            break;
        default:
            return -1;
    }

    if (status != 0) {
        resources_issue_callback(r, 1);
    }

    return status;
}

int resources_set_int(const char *name, int value)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign value to unknown "
                    "resource `%s'.", name);
        return -1;
    }

    if (r->event_relevant == RES_EVENT_STRICT && network_get_mode() != NETWORK_IDLE) {
        return -2;
    }

    if (r->event_relevant == RES_EVENT_SAME && network_connected()) {
        resource_record_event(r, uint_to_void_ptr(value));
        return 0;
    }

    return resources_set_internal_int(r, value);
}

int resources_set_string(const char *name, const char *value)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign value to unknown "
                    "resource `%s'.", name);
        return -1;
    }

    if (r->event_relevant == RES_EVENT_STRICT && network_get_mode() != NETWORK_IDLE) {
        return -2;
    }

    if (r->event_relevant == RES_EVENT_SAME && network_connected()) {
        resource_record_event(r, (resource_value_t)value);
        return 0;
    }

    return resources_set_internal_string(r, value);
}

void resources_set_value_event(void *data, int size)
{
    char *name;
    char *valueptr;
    resource_ram_t *r;

    name = data;
    valueptr = name + strlen(name) + 1;
    r = lookup(name);
    if (r == NULL) {
        log_error(LOG_DEFAULT, "resources_set_value_event: resource '%s' does not exist.", name);
    } else {
        if (r->type == RES_INTEGER) {
            resources_set_value_internal(r, (resource_value_t) uint_to_void_ptr(*(uint32_t *)valueptr));
        } else {
            resources_set_value_internal(r, (resource_value_t)valueptr);
        }
    }
}

int resources_set_int_sprintf(const char *name, int value, ...)
{
    va_list args;
    char *resname;
    int result;

    va_start(args, value);
    resname = lib_mvsprintf(name, args);
    va_end(args);

    result = resources_set_int(resname, value);
    lib_free(resname);

    return result;
}

int resources_set_string_sprintf(const char *name, const char *value, ...)
{
    va_list args;
    char *resname;
    int result;

    va_start(args, value);
    resname = lib_mvsprintf(name, args);
    va_end(args);

    result = resources_set_string(resname, value);
    lib_free(resname);

    return result;
}

int resources_set_value_string(const char *name, const char *value)
{
    resource_ram_t *r = lookup(name);
    int status;

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign value to unknown "
                    "resource `%s'.", name);
        return -1;
    }

    switch (r->type) {
        case RES_INTEGER:
            {
                char *endptr;
                int int_value;

                int_value = (int)strtol(value, &endptr, 0);

                if (*endptr == '\0') {
                    status = (*r->set_func_int)(int_value, r->param);
                } else {
                    status = -1;
                }
            }
            break;
        case RES_STRING:
            status = (*r->set_func_string)(value, r->param);
            break;
        default:
            log_warning(LOG_DEFAULT, "Unknown resource type for `%s'", name);
            status = -1;
            break;
    }

    if (status != 0) {
        resources_issue_callback(r, 1);
    }

    return status;
}

int resources_get_value(const char *name, void *value_return)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to read value from unknown "
                    "resource `%s'.", name);
        return -1;
    }

    switch (r->type) {
        case RES_INTEGER:
            *(int *)value_return = *(int *)r->value_ptr;
            break;
        case RES_STRING:
            *(char **)value_return = *(char **)r->value_ptr;
            break;
        default:
            log_warning(LOG_DEFAULT, "Unknown resource type for `%s'", name);
            return -1;
    }

    return 0;
}


/** \brief  Get value for resource \a name and store in \a value_return
 *
 * If the resource is unknown, the return value is set to 0.
 *
 * \param[in]   name            resource name
 * \param[out]  value_return    resource value target
 *
 * \return  0 on succes, -1 on failure
 */
int resources_get_int(const char *name, int *value_return)
{
    resource_ram_t *r = lookup(name);

    /* set some sane value */
    *value_return = 0;

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to read value from unknown "
                    "resource `%s'.", name);
        return -1;
    }

    switch (r->type) {
        case RES_INTEGER:
            *value_return = *(int *)r->value_ptr;
            break;
        default:
            log_warning(LOG_DEFAULT, "Unknown resource type for `%s'", name);
            return -1;
    }

    return 0;
}


/** \brief  Get string resource \a name and store in \a value_return
 *
 * If the resource \a name is unknown, \a value_return is set to NULL.
 *
 * \param[in]   name            resource name
 * \param[out]  value_return    resource value target
 *
 * \return  0 on success, -1 on failure
 */
int resources_get_string(const char *name, const char **value_return)
{
    resource_ram_t *r = lookup(name);

    /* don't return an unitialized value, NULL is probably a good choice to
     * trace bugs
     */
    *value_return = NULL;

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to read value from unknown "
                    "resource `%s'.", name);
        return -1;
    }

    switch (r->type) {
        case RES_STRING:
            *value_return = *(const char **)r->value_ptr;
            break;
        default:
            log_warning(LOG_DEFAULT, "Unknown resource type for `%s'", name);
            return -1;
    }

    return 0;
}

int resources_get_int_sprintf(const char *name, int *value_return, ...)
{
    va_list args;
    char *resname;
    int result;

    va_start(args, value_return);
    resname = lib_mvsprintf(name, args);
    va_end(args);

    result = resources_get_int(resname, value_return);
    lib_free(resname);

    return result;
}

int resources_get_string_sprintf(const char *name, const char **value_return,
                                 ...)
{
    va_list args;
    char *resname;
    int result;

    va_start(args, value_return);
    resname = lib_mvsprintf(name, args);
    va_end(args);

    result = resources_get_string(resname, value_return);
    lib_free(resname);

    return result;
}

int resources_set_default_int(const char *name, int value)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign default to unknown "
                    "resource `%s'.", name);
        return -1;
    }

    r->factory_value = uint_to_void_ptr(value);
    return 0;
}

int resources_set_default_string(const char *name, char *value)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to assign default to unknown "
                    "resource `%s'.", name);
        return -1;
    }
    /* since these pointers are usually static/not allocated, we just
       assign it here and don't free() as one might expect */
    r->factory_value = value;
    return 0;
}

int resources_get_default_value(const char *name, void *value_return)
{
    resource_ram_t *r = lookup(name);

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to read value from unknown "
                    "resource `%s'.", name);
        return -1;
    }

    switch (r->type) {
        case RES_INTEGER:
            *(int *)value_return = vice_ptr_to_int(r->factory_value);
            break;
        case RES_STRING:
            *(char **)value_return = (char *)(r->factory_value);
            break;
        default:
            log_warning(LOG_DEFAULT, "Unknown resource type for `%s'", name);
            return -1;
    }

    return 0;
}

/* FIXME: make event safe */
int resources_set_defaults(void)
{
    unsigned int i;

    /* the cartridge system uses internal state variables so the default cartridge
       can be unset without changing the attached cartridge and/or attach another
       cartridge without changing the default. to completely restore the default,
       which is no default cartridge, and no currently attached cartridge, call
       the respective functions of the cartridge system here */
    cartridge_unset_default();
    cartridge_detach_image(-1);

    for (i = 0; i < num_resources; i++) {
        DBG(("setting default for '%s'\n", resources[i].name));
        switch (resources[i].type) {
            case RES_INTEGER:
                if ((*resources[i].set_func_int)(vice_ptr_to_int(resources[i].factory_value),
                                                 resources[i].param) < 0) {
                    log_verbose("Cannot set int resource '%s' to default '%d'",
                                resources[i].name, vice_ptr_to_int(resources[i].factory_value));
                    return -1;
                }
                break;
            case RES_STRING:
                if ((*resources[i].set_func_string)((const char *)(resources[i].factory_value),
                                                    resources[i].param) < 0) {
                    log_verbose("Cannot set string resource '%s' to default '%s'",
                                resources[i].name, (const char *)(resources[i].factory_value));
                    return -1;
                }
                break;
        }
        DBG(("issue callback for '%s'\n", resources[i].name));
        resources_issue_callback(resources + i, 0);
    }

    if (resource_modified_callback != NULL) {
        resources_exec_callback_chain(resource_modified_callback, NULL);
    }

    return 0;
}

int resources_set_event_safe(void)
{
    unsigned int i;

    for (i = 0; i < num_resources; i++) {
        switch (resources[i].type) {
            case RES_INTEGER:
                if (resources[i].event_relevant == RES_EVENT_STRICT) {
                    if ((*resources[i].set_func_int)(vice_ptr_to_int(resources[i].event_strict_value),
                                                     resources[i].param) < 0) {
                        log_error(LOG_DEFAULT, "failed to set event-safe resource value for '%s'\n", resources[i].name);
                        return -1;
                    }
                }
                break;
            case RES_STRING:
                if (resources[i].event_relevant == RES_EVENT_STRICT) {
                    if ((*resources[i].set_func_string)((const char *)(resources[i].event_strict_value),
                                                        resources[i].param) < 0) {
                        log_error(LOG_DEFAULT, "failed to set event-safe resource value for '%s'\n", resources[i].name);
                        return -1;
                    }
                }
                break;
        }
        resources_issue_callback(resources + i, 0);
    }

    if (resource_modified_callback != NULL) {
        resources_exec_callback_chain(resource_modified_callback, NULL);
    }

    return 0;
}

void resources_get_event_safe_list(event_list_state_t *list)
{
    unsigned int i;
    char *event_data;
    int data_size;

    for (i = 0; i < num_resources; i++) {
        if (resources[i].event_relevant == RES_EVENT_SAME) {
            resource_create_event_data(&event_data, &data_size,
                                       &resources[i],
                                       *(resources[i].value_ptr));
            event_record_in_list(list, EVENT_RESOURCE,
                                 event_data, data_size);
            lib_free(event_data);
        }
    }
    event_record_in_list(list, EVENT_LIST_END, NULL, 0);
}

int resources_toggle(const char *name, int *new_value_return)
{
    resource_ram_t *r = lookup(name);
    int value;

    if (r == NULL) {
        log_warning(LOG_DEFAULT,
                    "Trying to toggle boolean value of unknown "
                    "resource `%s'.", name);
        return -1;
    }

    value = !(*(int *)r->value_ptr);

    if (r->event_relevant == RES_EVENT_STRICT && network_get_mode() != NETWORK_IDLE) {
        return -2;
    }

    if (new_value_return != NULL) {
        *new_value_return = value;
    }

    if (r->event_relevant == RES_EVENT_SAME && network_connected()) {
        resource_record_event(r, uint_to_void_ptr(value));
        return 0;
    }

    return resources_set_internal_int(r, value);
}

int resources_touch(const char *name)
{
    void *tmp;

    if (resources_get_value(name, (resource_value_t *)&tmp) < 0) {
        return -1;
    }

    return resources_set_value(name, (resource_value_t)tmp);
}

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

/* Check whether `buf' is the emulator ID for the machine we are emulating.  */
static int check_emu_id(const char *buf, const char *checkstring)
{
    size_t machine_id_len, buf_len;

    buf_len = strlen(buf);
    if (*buf != '[' || *(buf + buf_len - 1) != ']') {
        return 0;
    }

    if (checkstring == NULL) {
        return 1;
    }

    machine_id_len = strlen(checkstring);
    if (machine_id_len != buf_len - 2) {
        return 0;
    }

    if (strncmp(buf + 1, checkstring, machine_id_len) == 0) {
        return 1;
    } else {
        return 0;
    }
}

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

/* Read one resource line from the file descriptor `f'.
   Returns:
    1 on success,
    0 on EOF or end of emulator section.
   -1 on general error
   RESERR_TYPE_INVALID on parse/type error
   RESERR_UNKNOWN_RESOURCE on unknown resource error
*/
/* FIXME: make event safe */
int resources_read_item_from_file(FILE *f)
{
    char buf[1024];
    char *arg_ptr;
    int line_len, resname_len;
    size_t arg_len;
    resource_ram_t *r;

    line_len = util_get_line(buf, 1024, f);

    if (line_len < 0) {
        return 0;
    }

    /* Ignore empty lines.  */
    if (*buf == '\0') {
        return 1;
    }

    if (*buf == '[') {
        /* End of emulator-specific section.  */
        return 0;
    }

    arg_ptr = strchr(buf, '=');
    if (!arg_ptr) {
        return -1;
    }

    resname_len = (int)(arg_ptr - buf);
    arg_ptr++;
    arg_len = strlen(arg_ptr);

    /* If the value is between quotes, remove them.  */
    if (*arg_ptr == '"' && *(arg_ptr + arg_len - 1) == '"') {
        *(arg_ptr + arg_len - 1) = '\0';
        arg_ptr++;
    }

    *(buf + resname_len) = '\0';

    {
        int result;

        r = lookup(buf);
        if (r == NULL) {
            log_error(LOG_DEFAULT, "Unknown resource `%s'.", buf);
            return RESERR_UNKNOWN_RESOURCE;
        }

        switch (r->type) {
            case RES_INTEGER:
                result = (*r->set_func_int)(atoi(arg_ptr), r->param);
                break;
            case RES_STRING:
                result = (*r->set_func_string)(arg_ptr, r->param);
                break;
            default:
                log_error(LOG_DEFAULT, "Unknown resource type for `%s'.",
                          r->name);
                result = RESERR_TYPE_INVALID;
                break;
        }

        if (result < 0) {
            switch (r->type) {
                case RES_INTEGER:
                case RES_STRING:
                    log_error(LOG_DEFAULT, "Cannot assign value `%s' to resource `%s'.", arg_ptr, r->name);
                    break;
                default:
                    log_error(LOG_DEFAULT, "Cannot assign value to resource `%s'.", r->name);
                    break;
            }
            return -1;
        }

        resources_issue_callback(r, 0);

        return 1;
    }
}

static const char *versionmessage =
    "Please notice that using configuration files from a different VICE "
    "version is not supported. It should be mostly no problem in practice - "
    "however, if you experience any problems eg. after updating VICE, you might "
    "have to reset the settings to defaults.\n\n"
    "Save the settings now to make this message go away.";

static int check_resource_file_version(const char *fname)
{
    FILE *f;
    int err = 1;

    f = fopen(fname, MODE_READ_TEXT);
    if (f == NULL) {
        return RESERR_FILE_NOT_FOUND;
    }

    /* Find the version tag  */
    while(1) {
        char buf[1024];

        if (util_get_line(buf, 1024, f) < 0) {
            break;
        }

        if (check_emu_id(buf, "Version")) {
            err = 0;
            break;
        }
    }

    if (err == 0) {
        char buf[1024];

        if (util_get_line(buf, 1024, f) < 0) {
            err = 1;
        } if (*buf == 0) {
            err = 1;
        } else {
            char *tag = strtok(buf, "=");
            if (strcmp(tag, "ConfigVersion") == 0) {
                tag = strtok(NULL, "=");
                if (strcmp(tag, VERSION) != 0) {
                    log_warning(LOG_DEFAULT, "Config file version mismatch (is '%s', expected '%s').\n",
                                tag, VERSION);
                    ui_error("WARNING: Configuration file version mismatch (is '%s', expected '%s').\n\n%s",
                            tag, VERSION, versionmessage);
                    err = 0;
                }
            }
        }
    }

    fclose(f);

    if (err) {
        log_warning(LOG_DEFAULT, "No version tag found in config file.");
        ui_error("WARNING: No version tag found in configuration file.\n\n%s", versionmessage);
    }

    return 0;
}

static int load_resource_file(const char *fname)
{
    FILE *f;
    int retval;
    int line_num;
    int err = 0;

    f = fopen(fname, MODE_READ_TEXT);
    if (f == NULL) {
        return RESERR_FILE_NOT_FOUND;
    }

    log_message(LOG_DEFAULT, "Reading configuration file `%s'.", fname);

    /* Find the start of the configuration section for this emulator.  */
    for (line_num = 1;; line_num++) {
        char buf[1024];

        if (util_get_line(buf, 1024, f) < 0) {
            fclose(f);
            return RESERR_READ_ERROR;
        }

        if (check_emu_id(buf, machine_id)) {
            line_num++;
            break;
        }
    }

    do {
        retval = resources_read_item_from_file(f);
        switch (retval) {
            case RESERR_TYPE_INVALID:
                    log_error(LOG_DEFAULT,
                            "%s: Invalid resource specification at line %d.",
                            fname, line_num);
                    err = 1;
                break;
            case RESERR_UNKNOWN_RESOURCE:
                    log_warning(LOG_DEFAULT,
                                "%s: Unknown resource specification at line %d.",
                                fname, line_num);
                break;
        }
        line_num++;
    } while (retval != 0);

    fclose(f);

    if (resource_modified_callback != NULL) {
        resources_exec_callback_chain(resource_modified_callback, NULL);
    }

    return err ? RESERR_FILE_INVALID : 0;
}

/* Load the resources from file `fname'.  If `fname' is NULL, load them from
   the default resource file.  */
int resources_load(const char *fname)
{
    char *default_name = NULL;
    int res;
    if (fname == NULL) {
        if (vice_config_file == NULL) {
            /* try the alternative name/location first */
            default_name = archdep_default_portable_resource_file_name();
            if (default_name != NULL) {
                if (archdep_access(default_name, ARCHDEP_ACCESS_R_OK) != 0)  {
                    /* if not found at alternative location, try the normal one */
                    lib_free(default_name);
                    default_name = archdep_default_resource_file_name();
                }
            }
        } else {
            default_name = lib_strdup(vice_config_file);
        }
        fname = default_name;
        /* only check version if fname was NULL, that allows to load extra
           settings without the check */
        check_resource_file_version(fname);
    }
    res = load_resource_file(fname);
    lib_free(default_name);
    return res;
}

/* Reset resources to defaults, then load the resources from file `fname'.
   If `fname' is NULL, load them from the default resource file.  */
int resources_reset_and_load(const char *fname)
{
    resources_set_defaults();
    if (fname != NULL) {
        /* if fname was not NULL, check it's version here, as this function will
           only be used for regular setting and resources_load will only check
           if fname is NULL. */
        check_resource_file_version(fname);
    }
    return resources_load(fname);
}

static char *string_resource_item(int num, const char *delim)
{
    char *line = NULL;
    resource_value_t v;

    switch (resources[num].type) {
        case RES_INTEGER:
            v = (resource_value_t) uint_to_void_ptr(*(int *)resources[num].value_ptr);
            line = lib_msprintf("%s=%d%s", resources[num].name, vice_ptr_to_int(v), delim);
            break;
        case RES_STRING:
            v = *resources[num].value_ptr;
            if ((char *)v != NULL) {
                line = lib_msprintf("%s=\"%s\"%s", resources[num].name, (char *)v,
                                    delim);
            } else {
                line = lib_msprintf("%s=%s", resources[num].name, delim);
            }
            break;
        default:
            log_error(LOG_DEFAULT, "Unknown value type for resource `%s'.",
                      resources[num].name);
            break;
    }
    return line;
}

/* Write the resource specification for resource number `num' to file
   descriptor `f'.  */
static void write_resource_item(FILE *f, int num)
{
    char *line;

    line = string_resource_item(num, "\n");

    if (line != NULL) {
        fputs(line, f);
        lib_free(line);
    }
}

/* check if a resource contains its default value */
static int resource_item_isdefault(int num)
{
    int i1, i2;
    char *s1, *s2;
    resource_value_t v;

    switch (resources[num].type) {
        case RES_INTEGER:
            v = (resource_value_t) uint_to_void_ptr(*(int *)resources[num].value_ptr);
            i1 = vice_ptr_to_int(v);
            i2 = vice_ptr_to_int(resources[num].factory_value);
            if (i1 == i2) {
                return 1;
            }
            DBG(("%s = (int) default: \"%d\" is: \"%d\"\n", resources[num].name, i2, i1));
            break;
        case RES_STRING:
            v = *resources[num].value_ptr;
            s1 = (char *)v == NULL ? "" : (char *)v;
            s2 = (char *)resources[num].factory_value == NULL ? "" : (char *)resources[num].factory_value;
            if (!strcmp(s1, s2)) {
                return 1;
            }
            DBG(("%s = (string) default: \"%s\" is: \"%s\"\n", resources[num].name, s2, s1));
            break;
        default:
            log_error(LOG_DEFAULT, "Unknown value type for resource `%s'.", resources[num].name);
            break;
    }
    return 0;
}

/* Save all the resources into file `fname'.  If `fname' is NULL, save them
   in the default resource file.  Writing the resources does not destroy the
   resources for the other emulators.  */
int resources_save(const char *fname)
{
    char *backup_name = NULL;
    FILE *in_file = NULL, *out_file;
    unsigned int i;
    char *default_name = NULL;

    /* get name for config file */
    if (fname == NULL) {
        if (vice_config_file == NULL) {
            /* try the alternative name/location first */
            default_name = archdep_default_portable_resource_file_name();
            if (default_name != NULL) {
                if (archdep_access(default_name, ARCHDEP_ACCESS_R_OK) != 0) {
                    /* if not found at alternative location, try the normal one
                     this also creates the .vice directory if not present */
                    lib_free(default_name);
                    default_name = archdep_default_resource_file_name();
                }
            }
        } else {
            default_name = lib_strdup(vice_config_file);
        }
        fname = default_name;
    }

    /* make a backup of an existing config, open it */
    if (util_file_exists(fname) != 0) {
        /* try to open it */
        if (archdep_access(fname, ARCHDEP_ACCESS_W_OK) != 0) {
            lib_free(default_name);
            return RESERR_WRITE_PROTECTED;
        }
        /* get backup name */
        backup_name = archdep_make_backup_filename(fname);
        /* if backup exists, remove it */
        if (util_file_exists(backup_name) != 0) {
            if (archdep_access(backup_name, ARCHDEP_ACCESS_W_OK) != 0) {
                lib_free(backup_name);
                lib_free(default_name);
                return RESERR_WRITE_PROTECTED;
            }
            if (archdep_remove(backup_name) != 0) {
                lib_free(backup_name);
                lib_free(default_name);
                return RESERR_CANNOT_REMOVE_BACKUP;
            }
        }
        /* move existing config to backup */
        if (archdep_rename(fname, backup_name) != 0) {
            lib_free(backup_name);
            lib_free(default_name);
            return RESERR_CANNOT_RENAME_FILE;
        }
        /* open the old config */
        in_file = fopen(backup_name, MODE_READ_TEXT);
        if (!in_file) {
            lib_free(backup_name);
            lib_free(default_name);
            return RESERR_READ_ERROR;
        }
    }

    log_message(LOG_DEFAULT, "Writing configuration file `%s'.", fname);

    out_file = fopen(fname, MODE_WRITE_TEXT);

    if (!out_file) {
        if (in_file != NULL) {
            fclose(in_file);
        }
        lib_free(backup_name);
        lib_free(default_name);
        return RESERR_CANNOT_CREATE_FILE;
    }

    setbuf(out_file, NULL);

    /* put version tag at the top of the config file */
    fprintf(out_file, "[Version]\nConfigVersion=%s\n\n", VERSION);

    /* Copy the configuration for the other emulators.  */
    if (in_file != NULL) {
        while (1) {
            char buf[1024];

            if (util_get_line(buf, 1024, in_file) < 0) {
                break;
            }

            /* skip version tag */
            if (check_emu_id(buf, "Version")) {
                /* skip lines until we hit another section start */
                do {
                    if (util_get_line(buf, 1024, in_file) < 0) {
                        *buf = 0;
                        break;
                    }
                } while (*buf != '[');
            }

            /* exit if we found ourselves */
            if (check_emu_id(buf, machine_id)) {
                break;
            }

            fprintf(out_file, "%s\n", buf);
        }
    }

    /* Write our current configuration.  */
    fprintf(out_file, "[%s]\n", machine_id);
    for (i = 0; i < num_resources; i++) {
        /* only dump into the file what is different to the default config */
        if (!resource_item_isdefault(i)) {
            write_resource_item(out_file, i);
        }
    }
    fprintf(out_file, "\n");

    if (in_file != NULL) {
        char buf[1024];

        /* Skip the old configuration for this emulator.  */
        while (1) {
            if (util_get_line(buf, 1024, in_file) < 0) {
                break;
            }

            /* Check if another emulation section starts.  */
            if (*buf == '[') {
                /* skip version tag */
                if (check_emu_id(buf, "Version")) {
                    /* skip lines until we hit another section start */
                    do {
                        if (util_get_line(buf, 1024, in_file) < 0) {
                            *buf = 0;
                            break;
                        }
                    } while (*buf != '[');
                }
                fprintf(out_file, "%s\n", buf);
                break;
            }
        }

        if (!feof(in_file)) {
            /* Copy the configuration for the other emulators.  */
            while (util_get_line(buf, 1024, in_file) >= 0) {
                /* skip version tag */
                if (check_emu_id(buf, "Version")) {
                    /* skip lines until we hit another section start */
                    do {
                        if (util_get_line(buf, 1024, in_file) < 0) {
                            *buf = 0;
                            break;
                        }
                    } while (*buf != '[');
                }
                fprintf(out_file, "%s\n", buf);
            }
        }
        fclose(in_file);
        /* remove the backup */
        archdep_remove(backup_name);
    }

    fclose(out_file);
    lib_free(backup_name);
    lib_free(default_name);
    return 0;
}

/* dump ALL resources of the current machine into a file */
int resources_dump(const char *fname)
{
    FILE *out_file;
    unsigned int i;

    log_message(LOG_DEFAULT, "Dumping %u resources to file `%s'.",
            num_resources, fname);

    out_file = fopen(fname, MODE_WRITE_TEXT);
    if (!out_file) {
        return RESERR_CANNOT_CREATE_FILE;
    }

    setbuf(out_file, NULL);

    /* Write our current configuration.  */
    fprintf(out_file, "[%s]\n", machine_id);
    for (i = 0; i < num_resources; i++) {
        write_resource_item(out_file, i);
    }
    fprintf(out_file, "\n");

    fclose(out_file);
    return 0;
}

/* log resources that do not have their default values */
void resources_log_active(void)
{
    unsigned int i, n = 0;

    for (i = 0; i < num_resources; i++) {
        if (!resource_item_isdefault(i)) {
            char *line = string_resource_item(i, "");
            if (line != NULL) {
                if (n == 0) {
                    log_message(LOG_DEFAULT, "\nResources with non default values:");
                    n++;
                }
                log_message(LOG_DEFAULT, "%s", line);
                lib_free(line);
            }
        }
    }
}

int resources_register_callback(const char *name,
                                resource_callback_func_t *callback,
                                void *callback_param)
{
    if (name == NULL) {
        resources_add_callback(&resource_modified_callback, callback,
                               callback_param);
        return 0;
    } else {
        resource_ram_t *res = lookup(name);

        if (res != NULL) {
            resources_add_callback(&(res->callback), callback, callback_param);
            return 0;
        }
    }
    return -1;
}
