/******************************************************************************
 * $Id$
 *
 * Copyright (c) 2005-2008 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#include <ctype.h> /* isxdigit() */
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h> /* free() */
#include <string.h> /* strcmp() */

#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h> /* g_unlink() */
#ifdef HAVE_GIO
 #include <gio/gio.h> /* g_file_trash() */
#endif
#ifdef HAVE_DBUS_GLIB
 #include <dbus/dbus-glib.h>
#endif

#include <libevent/evhttp.h>

#include <libtransmission/transmission.h> /* TR_RATIO_NA, TR_RATIO_INF */
#include <libtransmission/utils.h> /* tr_inf */

#include "conf.h"
#include "hig.h"
#include "tr-prefs.h"
#include "util.h"

char*
tr_strlratio( char * buf,
              double ratio,
              size_t buflen )
{
    if( (int)ratio == TR_RATIO_NA )
        g_strlcpy( buf, _( "None" ), buflen );
    else if( (int)ratio == TR_RATIO_INF )
        g_strlcpy( buf, "\xE2\x88\x9E", buflen );
    else if( ratio < 10.0 )
        g_snprintf( buf, buflen, "%'.2f", ratio );
    else if( ratio < 100.0 )
        g_snprintf( buf, buflen, "%'.1f", ratio );
    else
        g_snprintf( buf, buflen, "%'.0f", ratio );
    return buf;
}

#define KILOBYTE_FACTOR 1024.0
#define MEGABYTE_FACTOR ( 1024.0 * 1024.0 )
#define GIGABYTE_FACTOR ( 1024.0 * 1024.0 * 1024.0 )

char*
tr_strlsize( char *  buf,
             guint64 size,
             size_t  buflen )
{
    if( !size )
        g_strlcpy( buf, _( "None" ), buflen );
#if GLIB_CHECK_VERSION( 2, 16, 0 )
    else
    {
        char * tmp = g_format_size_for_display( size );
        g_strlcpy( buf, tmp, buflen );
        g_free( tmp );
    }
#else
    else if( size < (guint64)KILOBYTE_FACTOR )
        g_snprintf( buf, buflen,
                    ngettext( "%'u byte", "%'u bytes",
                              (guint)size ), (guint)size );
    else
    {
        gdouble displayed_size;
        if( size < (guint64)MEGABYTE_FACTOR )
        {
            displayed_size = (gdouble) size / KILOBYTE_FACTOR;
            g_snprintf( buf, buflen, _( "%'.1f KB" ), displayed_size );
        }
        else if( size < (guint64)GIGABYTE_FACTOR )
        {
            displayed_size = (gdouble) size / MEGABYTE_FACTOR;
            g_snprintf( buf, buflen, _( "%'.1f MB" ), displayed_size );
        }
        else
        {
            displayed_size = (gdouble) size / GIGABYTE_FACTOR;
            g_snprintf( buf, buflen, _( "%'.1f GB" ), displayed_size );
        }
    }
#endif
    return buf;
}

char*
tr_strlspeed( char * buf,
              double kb_sec,
              size_t buflen )
{
    const double speed = kb_sec;

    if( speed < 1000.0 )  /* 0.0 KB to 999.9 KB */
        g_snprintf( buf, buflen, _( "%'.1f KB/s" ), speed );
    else if( speed < 102400.0 ) /* 0.98 MB to 99.99 MB */
        g_snprintf( buf, buflen, _( "%'.2f MB/s" ), ( speed / 1024 ) );
    else if( speed < 1024000.0 ) /* 100.0 MB to 999.9 MB */
        g_snprintf( buf, buflen, _( "%'.1f MB/s" ), ( speed / 1024 ) );
    else /* insane speeds */
        g_snprintf( buf, buflen, _( "%'.2f GB/s" ), ( speed / 1048576 ) );

    return buf;
}

char*
tr_strltime( char * buf,
             int    seconds,
             size_t buflen )
{
    int  days, hours, minutes;
    char d[128], h[128], m[128], s[128];

    if( seconds < 0 )
        seconds = 0;

    days = seconds / 86400;
    hours = ( seconds % 86400 ) / 3600;
    minutes = ( seconds % 3600 ) / 60;
    seconds = ( seconds % 3600 ) % 60;

    g_snprintf( d, sizeof( d ), ngettext( "%'d day", "%'d days",
                                          days ), days );
    g_snprintf( h, sizeof( h ), ngettext( "%'d hour", "%'d hours",
                                          hours ), hours );
    g_snprintf( m, sizeof( m ),
                ngettext( "%'d minute", "%'d minutes", minutes ), minutes );
    g_snprintf( s, sizeof( s ),
                ngettext( "%'d second", "%'d seconds", seconds ), seconds );

    if( days )
    {
        if( days >= 4 || !hours )
        {
            g_strlcpy( buf, d, buflen );
        }
        else
        {
            g_snprintf( buf, buflen, "%s, %s", d, h );
        }
    }
    else if( hours )
    {
        if( hours >= 4 || !minutes )
        {
            g_strlcpy( buf, h, buflen );
        }
        else
        {
            g_snprintf( buf, buflen, "%s, %s", h, m );
        }
    }
    else if( minutes )
    {
        if( minutes >= 4 || !seconds )
        {
            g_strlcpy( buf, m, buflen );
        }
        else
        {
            g_snprintf( buf, buflen, "%s, %s", m, s );
        }
    }
    else
    {
        g_strlcpy( buf, s, buflen );
    }

    return buf;
}

char *
gtr_localtime( time_t time )
{
    const struct tm tm = *localtime( &time );
    char            buf[256], *eoln;

    g_strlcpy( buf, asctime( &tm ), sizeof( buf ) );
    if( ( eoln = strchr( buf, '\n' ) ) )
        *eoln = '\0';

    return g_locale_to_utf8( buf, -1, NULL, NULL, NULL );
}

int
mkdir_p( const char * path,
         mode_t       mode )
{
#if GLIB_CHECK_VERSION( 2, 8, 0 )
    return !g_mkdir_with_parents( path, mode );
#else
    return !tr_mkdirp( path, mode );
#endif
}

GSList *
dupstrlist( GSList * l )
{
    GSList * ret = NULL;

    for( ; l != NULL; l = l->next )
        ret = g_slist_prepend( ret, g_strdup( l->data ) );
    return g_slist_reverse( ret );
}

char *
joinstrlist( GSList *list,
             char *  sep )
{
    GSList * l;
    GString *gstr = g_string_new ( NULL );

    for( l = list; l != NULL; l = l->next )
    {
        g_string_append ( gstr, (char*)l->data );
        if( l->next != NULL )
            g_string_append ( gstr, ( sep ) );
    }
    return g_string_free ( gstr, FALSE );
}

void
freestrlist( GSList *list )
{
    g_slist_foreach ( list, (GFunc)g_free, NULL );
    g_slist_free ( list );
}

char *
decode_uri( const char * uri )
{
    gboolean in_query = FALSE;
    char *   ret = g_new( char, strlen( uri ) + 1 );
    char *   out = ret;

    for( ; uri && *uri; )
    {
        char ch = *uri;
        if( ch == '?' )
            in_query = TRUE;
        else if( ch == '+' && in_query )
            ch = ' ';
        else if( ch == '%' && isxdigit( (unsigned char)uri[1] )
               && isxdigit( (unsigned char)uri[2] ) )
        {
            char buf[3] = { uri[1], uri[2], '\0' };
            ch = (char) g_ascii_strtoull( buf, NULL, 16 );
            uri += 2;
        }

        ++uri;
        *out++ = ch;
    }

    *out = '\0';
    return ret;
}

GSList *
checkfilenames( int    argc,
                char **argv )
{
    int      i;
    GSList * ret = NULL;
    char *   pwd = g_get_current_dir( );

    for( i = 0; i < argc; ++i )
    {
        char * filename = g_path_is_absolute( argv[i] )
                          ? g_strdup ( argv[i] )
                          : g_build_filename( pwd, argv[i], NULL );

        if( g_file_test( filename, G_FILE_TEST_EXISTS ) )
            ret = g_slist_prepend( ret, filename );
        else
            g_free( filename );
    }

    g_free( pwd );
    return g_slist_reverse( ret );
}

static void
onErrorResponse( GtkWidget * dialog,
                 int resp    UNUSED,
                 gpointer    glist )
{
    GSList * list = glist;

    if( list )
    {
        callbackfunc_t func = list->data;
        gpointer       user_data = list->next->data;
        func( user_data );
        g_slist_free( list );
    }

    gtk_widget_destroy( dialog );
}

static GtkWidget *
verrmsg_full( GtkWindow *    wind,
              callbackfunc_t func,
              void *         data,
              const char *   format,
              va_list        ap )
{
    GtkWidget *dialog;
    char *     msg;
    GSList *   funcdata = NULL;

    msg = g_strdup_vprintf( format, ap );

    if( NULL == wind )
        dialog = gtk_message_dialog_new(
            NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK, "%s", msg );
    else
        dialog = gtk_message_dialog_new(
            wind,
            GTK_DIALOG_MODAL |
            GTK_DIALOG_DESTROY_WITH_PARENT,
            GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
            "%s", msg );

    if( func )
    {
        funcdata = g_slist_append( funcdata, (gpointer)func );
        funcdata = g_slist_append( funcdata, data );
    }
    g_signal_connect( dialog, "response", G_CALLBACK(
                          onErrorResponse ), funcdata );
    g_free( msg );

    return dialog;
}

void
addTorrentErrorDialog( GtkWidget *  child,
                       int          err,
                       const char * filename )
{
    GtkWidget *  w;
    GtkWidget *  win;
    const char * fmt;
    char *       secondary;

    switch( err )
    {
        case TR_EINVALID:
            fmt = _( "The torrent file \"%s\" contains invalid data." );
            break;

        case TR_EDUPLICATE:
            fmt = _( "The torrent file \"%s\" is already in use." ); break;

        default:
            fmt = _(
                "The torrent file \"%s\" encountered an unknown error." );
            break;
    }
    secondary = g_strdup_printf( fmt, filename );
    win = ( !child || GTK_IS_WINDOW( child ) )
          ? child
          : gtk_widget_get_ancestor( child ? GTK_WIDGET(
                                         child ) : NULL, GTK_TYPE_WINDOW );
    w = gtk_message_dialog_new( GTK_WINDOW( win ),
                               GTK_DIALOG_DESTROY_WITH_PARENT,
                               GTK_MESSAGE_ERROR,
                               GTK_BUTTONS_CLOSE,
                               _( "Error opening torrent" ) );
    gtk_message_dialog_format_secondary_text( GTK_MESSAGE_DIALOG( w ),
                                              "%s", secondary );
    g_signal_connect_swapped( w, "response",
                              G_CALLBACK( gtk_widget_destroy ), w );
    gtk_widget_show_all( w );
    g_free( secondary );
}

void
errmsg( GtkWindow *  wind,
        const char * format,
        ... )
{
    GtkWidget * dialog;
    va_list     ap;

    va_start( ap, format );
    dialog = verrmsg_full( wind, NULL, NULL, format, ap );
    va_end( ap );

    if( NULL != wind && !GTK_WIDGET_MAPPED( GTK_WIDGET( wind ) ) )
    {
        g_signal_connect_swapped( wind, "map",
                                  G_CALLBACK( gtk_widget_show ), dialog );
    }
    else
    {
        gtk_widget_show( dialog );
    }
}

GtkWidget *
errmsg_full( GtkWindow *    wind,
             callbackfunc_t func,
             void *         data,
             const char *   format,
             ... )
{
    GtkWidget * dialog;
    va_list     ap;

    va_start( ap, format );
    dialog = verrmsg_full( wind, func, data, format, ap );
    va_end( ap );

    return dialog;
}

typedef void ( PopupFunc )( GtkWidget*, GdkEventButton* );

/* pop up the context menu if a user right-clicks.
   if the row they right-click on isn't selected, select it. */

gboolean
on_tree_view_button_pressed( GtkWidget *      view,
                             GdkEventButton * event,
                             gpointer         func )
{
    GtkTreeView * tv = GTK_TREE_VIEW( view );

    if( event->type == GDK_BUTTON_PRESS  &&  event->button == 3 )
    {
        GtkTreeSelection * selection = gtk_tree_view_get_selection( tv );
        GtkTreePath *      path;
        if( gtk_tree_view_get_path_at_pos ( tv,
                                            (gint) event->x,
                                            (gint) event->y,
                                            &path, NULL, NULL, NULL ) )
        {
            if( !gtk_tree_selection_path_is_selected ( selection, path ) )
            {
                gtk_tree_selection_unselect_all ( selection );
                gtk_tree_selection_select_path ( selection, path );
            }
            gtk_tree_path_free( path );
        }

        ( (PopupFunc*)func )( view, event );

        return TRUE;
    }

    return FALSE;
}

/* if the user clicked in an empty area of the list,
 * clear all the selections. */
gboolean
on_tree_view_button_released( GtkWidget *      view,
                              GdkEventButton * event,
                              gpointer         unused UNUSED )
{
    GtkTreeView * tv = GTK_TREE_VIEW( view );

    if( !gtk_tree_view_get_path_at_pos ( tv,
                                         (gint) event->x,
                                         (gint) event->y,
                                         NULL, NULL, NULL, NULL ) )
    {
        GtkTreeSelection * selection = gtk_tree_view_get_selection( tv );
        gtk_tree_selection_unselect_all ( selection );
        return TRUE;
    }

    return FALSE;
}

gpointer
tr_object_ref_sink( gpointer object )
{
#if GLIB_CHECK_VERSION( 2, 10, 0 )
    g_object_ref_sink( object );
#else
    g_object_ref( object );
    gtk_object_sink( GTK_OBJECT( object ) );
#endif
    return object;
}

int
tr_file_trash_or_remove( const char * filename )
{
    if( filename && *filename )
    {
        gboolean trashed = FALSE;
#ifdef HAVE_GIO
        GError * err = NULL;
        GFile *  file = g_file_new_for_path( filename );
        trashed = g_file_trash( file, NULL, &err );
        if( err )
            g_message( "Unable to trash file \"%s\": %s", filename, err->message );
        g_clear_error( &err );
        g_object_unref( G_OBJECT( file ) );
#endif

        if( !trashed && g_remove( filename ) )
        {
            const int err = errno;
            g_message( "Unable to remove file \"%s\": %s", filename, g_strerror( err ) );
        }
    }

    return 0;
}

char*
gtr_get_help_url( void )
{
    const char * fmt = "http://www.transmissionbt.com/help/gtk/%d.%dx";
    int          major, minor;

    sscanf( SHORT_VERSION_STRING, "%d.%d", &major, &minor );
    return g_strdup_printf( fmt, major, minor / 10 );
}

void
gtr_open_file( const char * path )
{
    if( path )
    {
        gboolean opened = FALSE;
#ifdef HAVE_GIO
        if( !opened )
        {
            GFile * file = g_file_new_for_path( path );
            char *  uri = g_file_get_uri( file );
            opened = g_app_info_launch_default_for_uri( uri, NULL, NULL );
            g_free( uri );
            g_object_unref( G_OBJECT( file ) );
        }
#endif
        if( !opened )
        {
            char * argv[] = { "xdg-open", (char*)path, NULL };
            g_spawn_async( NULL, argv, NULL, G_SPAWN_SEARCH_PATH,
                           NULL, NULL, NULL, NULL );
        }
    }
}

#define VALUE_SERVICE_NAME        "com.transmissionbt.Transmission"
#define VALUE_SERVICE_OBJECT_PATH "/com/transmissionbt/Transmission"
#define VALUE_SERVICE_INTERFACE   "com.transmissionbt.Transmission"

gboolean
gtr_dbus_add_torrent( const char * filename )
{
    static gboolean   success = FALSE;

#ifdef HAVE_DBUS_GLIB
    DBusGProxy *      proxy = NULL;
    GError *          err = NULL;
    DBusGConnection * conn;
    if( ( conn = dbus_g_bus_get( DBUS_BUS_SESSION, &err ) ) )
        proxy = dbus_g_proxy_new_for_name ( conn, VALUE_SERVICE_NAME,
                                            VALUE_SERVICE_OBJECT_PATH,
                                            VALUE_SERVICE_INTERFACE );
    else if( err )
        g_message( "err: %s", err->message );
    if( proxy )
        dbus_g_proxy_call( proxy, "AddFile", &err,
                           G_TYPE_STRING, filename,
                           G_TYPE_INVALID,
                           G_TYPE_BOOLEAN, &success,
                           G_TYPE_INVALID );
    if( err )
        g_message( "err: %s", err->message );

    g_object_unref( proxy );
    dbus_g_connection_unref( conn );
#endif
    return success;
}

gboolean
gtr_dbus_present_window( void )
{
    static gboolean   success = FALSE;

#ifdef HAVE_DBUS_GLIB
    DBusGProxy *      proxy = NULL;
    GError *          err = NULL;
    DBusGConnection * conn;
    if( ( conn = dbus_g_bus_get( DBUS_BUS_SESSION, &err ) ) )
        proxy = dbus_g_proxy_new_for_name ( conn, VALUE_SERVICE_NAME,
                                            VALUE_SERVICE_OBJECT_PATH,
                                            VALUE_SERVICE_INTERFACE );
    else if( err )
        g_message( "err: %s", err->message );
    if( proxy )
        dbus_g_proxy_call( proxy, "PresentWindow", &err,
                           G_TYPE_INVALID,
                           G_TYPE_BOOLEAN, &success,
                           G_TYPE_INVALID );
    if( err )
        g_message( "err: %s", err->message );

    g_object_unref( proxy );
    dbus_g_connection_unref( conn );
#endif
    return success;
}

GtkWidget *
gtr_button_new_from_stock( const char * stock,
                           const char * mnemonic )
{
    GtkWidget * image = gtk_image_new_from_stock( stock,
                                                  GTK_ICON_SIZE_BUTTON );
    GtkWidget * button = gtk_button_new_with_mnemonic( mnemonic );

    gtk_button_set_image( GTK_BUTTON( button ), image );
    return button;
}

/***
****
***/

guint
gtr_timeout_add_seconds( guint        interval,
                         GSourceFunc  function,
                         gpointer     data )
{
#if GLIB_CHECK_VERSION( 2,14,0 )
    return g_timeout_add_seconds( interval, function, data );
#else
    return g_timeout_add( interval*1000, function, data );
#endif
}