/**

 * $Id$

 *

 * User configuration support

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * 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.

 */

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <glib/gmem.h>

#include <glib/gstrfuncs.h>

#include <sys/types.h>

#include <sys/stat.h>

#include "dreamcast.h"

#include "config.h"

#include "lxpaths.h"

#include "maple/maple.h"

#define MAX_ROOT_GROUPS 16

extern struct lxdream_config_group hotkeys_group;

gboolean lxdream_load_config_file( const gchar *filename );

gboolean lxdream_save_config_file( const gchar *filename );

gboolean lxdream_load_config_stream( FILE *f );

gboolean lxdream_save_config_stream( FILE *f );

static struct lxdream_config_group global_group =

    { "global", dreamcast_config_changed, NULL, NULL,

       {{ "bios", N_("Bios ROM"), CONFIG_TYPE_FILE, NULL },

        { "flash", N_("Flash ROM"), CONFIG_TYPE_FILE, NULL },

        { "default path", N_("Default disc path"), CONFIG_TYPE_PATH, "." },

        { "save path", N_("Save-state path"), CONFIG_TYPE_PATH, NULL },

        { "vmu path", N_("VMU path"), CONFIG_TYPE_PATH, NULL },

        { "bootstrap", N_("Bootstrap IP.BIN"), CONFIG_TYPE_FILE, NULL },

        { "gdrom", NULL, CONFIG_TYPE_FILE, NULL },

        { "recent", NULL, CONFIG_TYPE_FILELIST, NULL },

        { "vmu", NULL, CONFIG_TYPE_FILELIST, NULL },

        { "quick state", NULL, CONFIG_TYPE_INTEGER, "0" },

        { NULL, CONFIG_TYPE_NONE }} };

static struct lxdream_config_group serial_group =

    { "serial", NULL, NULL, NULL,

       {{ "device", N_("Serial device"), CONFIG_TYPE_FILE, "/dev/ttyS1" },

        { NULL, CONFIG_TYPE_NONE }} };

/**

 * Dummy group for controllers (handled specially)

 */

static struct lxdream_config_group controllers_group =

    { "controllers", NULL, NULL, NULL, {{NULL, CONFIG_TYPE_NONE}} };

struct lxdream_config_group *lxdream_config_root[MAX_ROOT_GROUPS+1] = 

       { &global_group, &controllers_group, &hotkeys_group, &serial_group, NULL };

static gchar *lxdream_config_load_filename = NULL;

static gchar *lxdream_config_save_filename = NULL;

void lxdream_register_config_group( const gchar *key, lxdream_config_group_t group )

{

    int i;

    for( i=0; i<MAX_ROOT_GROUPS; i++ ) {

        if( lxdream_config_root[i] == NULL ) {

            lxdream_config_root[i] = group;

            lxdream_config_root[i+1] = NULL;

            return;

        }

    }

    ERROR( "Unable to register config group '%s': Too many configuration groups", key );

}

gboolean lxdream_find_config()

{

    gboolean result = TRUE;

    char *home = getenv("HOME");

    if( lxdream_config_save_filename == NULL ) {

        /* For compatibility, look for the old ~/.lxdreamrc first. Use it if 

         * found, otherwise use the new ~/.lxdream/lxdreamrc.

         */

        lxdream_config_save_filename = g_strdup_printf("%s/.%s", home, DEFAULT_CONFIG_FILENAME);

        if( access(lxdream_config_save_filename, R_OK) != 0 ) {

            g_free(lxdream_config_save_filename);

            const char *user_path = get_user_data_path();

            lxdream_config_save_filename = g_strdup_printf("%s/%s", user_path, DEFAULT_CONFIG_FILENAME);

        }

    }

    if( lxdream_config_load_filename == NULL ) {

        char *sysconfig = g_strdup_printf("%s/%s", get_sysconf_path(), DEFAULT_CONFIG_FILENAME);

        if( access(lxdream_config_save_filename, R_OK) == 0 ) {

            lxdream_config_load_filename = g_strdup(lxdream_config_save_filename);

            g_free(sysconfig);

        } else if( access( sysconfig, R_OK ) == 0 ) {

            lxdream_config_load_filename = sysconfig;

        } else {

            lxdream_config_load_filename = g_strdup(lxdream_config_save_filename);

            g_free(sysconfig);

            result = FALSE;

        }	

    }

    return result;

}

void lxdream_set_config_filename( const gchar *filename )

{

    if( lxdream_config_load_filename != NULL ) {

        g_free(lxdream_config_load_filename);

    }

    lxdream_config_load_filename = g_strdup(filename);

    if( lxdream_config_save_filename != NULL ) {

        g_free(lxdream_config_save_filename);

    }

    lxdream_config_save_filename = g_strdup(filename);

}

void lxdream_set_default_config( )

{

    /* Construct platform dependent defaults */

    const gchar *user_path = get_user_data_path();

    global_group.params[CONFIG_BIOS_PATH].default_value = g_strdup_printf( "%s/dcboot.rom", user_path ); 

    global_group.params[CONFIG_FLASH_PATH].default_value = g_strdup_printf( "%s/dcflash.rom", user_path ); 

    global_group.params[CONFIG_SAVE_PATH].default_value = g_strdup_printf( "%s/save", user_path ); 

    global_group.params[CONFIG_VMU_PATH].default_value = g_strdup_printf( "%s/vmu", user_path ); 

    global_group.params[CONFIG_BOOTSTRAP].default_value = g_strdup_printf( "%s/IP.BIN", user_path ); 

    /* Copy defaults into main values */

    for( int i=0; lxdream_config_root[i] != NULL; i++ ) {

        struct lxdream_config_entry *param = lxdream_config_root[i]->params;

        if( param != NULL ) {

            while( param->key != NULL ) {

                if( param->value != param->default_value ) {

                    if( param->value != NULL )

                        free( param->value );

                    param->value = (gchar *)param->default_value;

                }

                param++;

            }

        }

    }

    maple_detach_all();

}

const gchar *lxdream_get_config_value( lxdream_config_group_t group, int key )

{

    return group->params[key].value;

}

gboolean lxdream_set_config_value( lxdream_config_group_t group, int key, const gchar *value )

{

    lxdream_config_entry_t param = &group->params[key];

    if( param->value != value &&

        (param->value == NULL || value == NULL || strcmp(param->value,value) != 0)  ) {

        gchar *new_value = g_strdup(value);

        /* If the group defines an on_change handler, it can block the change

         * (ie due to an invalid setting).

         */

        if( group->on_change == NULL ||

            group->on_change(group->data, group,key, param->value, new_value) ) {

            /* Don't free the default value, but otherwise need to release the

             * old value.

             */

            if( param->value != param->default_value && param->value != NULL ) {

                free( param->value );

            }

            param->value = new_value;

        } else { /* on_change handler said no. */

            g_free(new_value);

            return FALSE;

        }

    }

    return TRUE;

}

const gchar *lxdream_get_global_config_value( int key )

{

    return global_group.params[key].value;

}

void lxdream_set_global_config_value( int key, const gchar *value )

{

    lxdream_set_config_value(&global_group, key, value);

}

GList *lxdream_get_global_config_list_value( int key )

{

    GList *result = NULL;

    const gchar *str = lxdream_get_global_config_value( key );

    if( str != NULL ) {

        gchar **strv = g_strsplit(str, ":",0);

        int i;

        for( i=0; strv[i] != NULL; i++ ) {

            result = g_list_append( result, g_strdup(strv[i]) );

        }

        g_strfreev(strv);

    }

    return result;

}

void lxdream_set_global_config_list_value( int key, const GList *list )

{

    if( list == NULL ) {

        lxdream_set_global_config_value( key, NULL );

    } else {

        const GList *ptr;

        int size = 0;

        for( ptr = list; ptr != NULL; ptr = g_list_next(ptr) ) {

            size += strlen( (gchar *)ptr->data ) + 1;

        }

        char buf[size];

        strcpy( buf, (gchar *)list->data );

        for( ptr = g_list_next(list); ptr != NULL; ptr = g_list_next(ptr) ) {

            strcat( buf, ":" );

            strcat( buf, (gchar *)ptr->data );

        }

        lxdream_set_global_config_value( key, buf );

    }

}

gchar *lxdream_get_global_config_path_value( int key )

{

    const gchar *str = lxdream_get_global_config_value(key);

    if( str == NULL ) {

        return NULL;

    } else {

        return get_expanded_path(str);

    }

}

const gchar *lxdream_set_global_config_path_value( int key, const gchar *value )

{

    gchar *temp = get_escaped_path(value);

    lxdream_set_global_config_value(key,temp);

    g_free(temp);

    return lxdream_get_global_config_value(key);

}

struct lxdream_config_group * lxdream_get_config_group( int group )

{

    return lxdream_config_root[group];

}

void lxdream_copy_config_group( lxdream_config_group_t dest, lxdream_config_group_t src )

{

    int i;

    for( i=0; src->params[i].key != NULL; i++ ) {

        lxdream_set_config_value( dest, i, src->params[i].value );

    }

}

void lxdream_clone_config_group( lxdream_config_group_t dest, lxdream_config_group_t src )

{

    int i;

    dest->key = src->key;

    dest->on_change = NULL;

    dest->key_binding = NULL;

    dest->data = NULL;

    for( i=0; src->params[i].key != NULL; i++ ) {

        dest->params[i].key = src->params[i].key;

        dest->params[i].label = src->params[i].label;

        dest->params[i].type = src->params[i].type;

        dest->params[i].tag = src->params[i].tag;

        dest->params[i].default_value = src->params[i].default_value;

        dest->params[i].value = NULL;

        lxdream_set_config_value( dest, i, src->params[i].value );

    }

    dest->params[i].key = NULL;

    dest->params[i].label = NULL;

}

gboolean lxdream_load_config( )

{

    if( lxdream_config_load_filename == NULL ) {

        lxdream_find_config();

    }

    return lxdream_load_config_file(lxdream_config_load_filename);

}

gboolean lxdream_save_config( )

{

    if( lxdream_config_save_filename == NULL ) {

        lxdream_find_config();

    }

    return lxdream_save_config_file(lxdream_config_save_filename);

}

gboolean lxdream_load_config_file( const gchar *filename )

{

    FILE *f;

    gboolean result;

    if( access(filename, F_OK) != 0 ) {

        INFO( "Configuration file '%s' does not exist, creating from defaults" );

        lxdream_set_default_config();

        lxdream_save_config();

    }

    f = fopen(filename, "ro");

    if( f == NULL ) {

        ERROR( "Unable to open configuration file '%s': %s", filename, strerror(errno) );

        lxdream_set_default_config();

        return FALSE;

    }

    result = lxdream_load_config_stream( f );

    fclose(f);

    return result;

}

gboolean lxdream_load_config_stream( FILE *f )

{

    char buf[512];

    int maple_device = -1, maple_subdevice = -1, i;

    struct lxdream_config_group *group = NULL;

    struct lxdream_config_group *top_group = NULL;

    maple_device_t device = NULL;

    lxdream_set_default_config();

    while( fgets( buf, sizeof(buf), f ) != NULL ) {

        g_strstrip(buf);

        if( buf[0] == '#' )

            continue;

        if( *buf == '[' ) {

            char *p = strchr(buf, ']');

            if( p != NULL ) {

                maple_device = maple_subdevice = -1;

                *p = '\0';

                g_strstrip(buf+1);

                for( i=0; lxdream_config_root[i] != NULL; i++ ) {

                    if( strcasecmp(lxdream_config_root[i]->key, buf+1) == 0 ) {

                        top_group = group = lxdream_config_root[i];

                        break;

                    }

                }

            }

        } else if( group != NULL ) {

            char *value = strchr( buf, '=' );

            if( value != NULL ) {

                struct lxdream_config_entry *param = group->params;

                *value = '\0';

                value++;

                g_strstrip(buf);

                g_strstrip(value);

                if( top_group == &controllers_group ) {

                    if( g_strncasecmp( buf, "device ", 7 ) == 0 ) {

                        maple_device = strtoul( buf+7, NULL, 0 );

                        if( maple_device < 0 || maple_device > 3 ) {

                            ERROR( "Device number must be between 0..3 (not '%s')", buf+7);

                            continue;

                        }

                        maple_subdevice = 0;

                        device = maple_new_device( value );

                        if( device == NULL ) {

                            ERROR( "Unrecognized device '%s'", value );

                        } else {

                            group = maple_get_device_config(device);

                            maple_attach_device( device, maple_device, maple_subdevice );

                        }

                        continue;

                    } else if( g_strncasecmp( buf, "subdevice ", 10 ) == 0 ) {

                        maple_subdevice = strtoul( buf+10, NULL, 0 );

                        if( maple_device == -1 ) {

                            ERROR( "Subdevice not allowed without primary device" );

                        } else if( maple_subdevice < 1 || maple_subdevice > 5 ) {

                            ERROR( "Subdevice must be between 1..5 (not '%s')", buf+10 );

                        } else if( (device = maple_new_device(value)) == NULL ) {

                            ERROR( "Unrecognized subdevice '%s'", value );

                        } else {

                            group = maple_get_device_config(device);

                            maple_attach_device( device, maple_device, maple_subdevice );

                        }

                        continue;

                    }

                }

                while( param->key != NULL ) {

                    if( strcasecmp( param->key, buf ) == 0 ) {

                        param->value = g_strdup(value);

                        break;

                    }

                    param++;

                }

            }

        }

    }

    return TRUE;

}

gboolean lxdream_save_config_file( const gchar *filename )

{

    FILE *f = fopen(filename, "wo");

    gboolean result;

    if( f == NULL ) {

        ERROR( "Unable to open '%s': %s", filename, strerror(errno) );

        return FALSE;

    }

    result = lxdream_save_config_stream(f);

    fclose(f);

    return TRUE;

}    

gboolean lxdream_save_config_stream( FILE *f )

{

    int i;

    for( i=0; lxdream_config_root[i] != NULL; i++ ) {

        fprintf( f, "[%s]\n", lxdream_config_root[i]->key );

        if( lxdream_config_root[i] == &controllers_group ) {

            int i,j;

            for( i=0; i<4; i++ ) {

                for( j=0; j<6; j++ ) {

                    maple_device_t dev = maple_get_device( i, j );

                    if( dev != NULL ) {

                        if( j == 0 )

                            fprintf( f, "Device %d = %s\n", i, dev->device_class->name );

                        else 

                            fprintf( f, "Subdevice %d = %s\n", j, dev->device_class->name );

                        lxdream_config_group_t group = maple_get_device_config(dev);

                        if( group != NULL ) {

                            lxdream_config_entry_t entry = group->params;

                            while( entry->key != NULL ) {

                                if( entry->value != NULL ) {

                                    fprintf( f, "%*c%s = %s\n", j==0?4:8, ' ',entry->key, entry->value );

                                }

                                entry++;

                            }

                        }

                    }

                }

            }

        } else {

            struct lxdream_config_entry *entry = lxdream_config_root[i]->params;

            while( entry->key != NULL ) {

                if( entry->value != NULL ) {

                    fprintf( f, "%s = %s\n", entry->key, entry->value );

                }

                entry++;

            }

        }

        fprintf( f, "\n" );

    }

    return TRUE;

}

void lxdream_make_config_dir( )

{

    const char *user_path = get_user_data_path();

    struct stat st;

    if( access( user_path, R_OK|X_OK ) == 0 && lstat( user_path, &st ) == 0 &&

            (st.st_mode & S_IFDIR) != 0 ) {

        /* All good */

        return;

    }

    if( mkdir( user_path, 0777 ) != 0 ) {

        ERROR( "Unable to create user configuration directory %s: %s", user_path, strerror(errno) );

        return;

    }

    char *vmupath = g_strdup_printf( "%s/vmu", user_path );

    mkdir( vmupath, 0777 );

    g_free( vmupath );

    char *savepath = g_strdup_printf( "%s/save", user_path );

    mkdir( savepath, 0777 );

    g_free( vmupath );

}