/*
 * This file Copyright (C) Mnemosyne LLC
 *
 * This file is licensed by the GPL version 2. Works owned by the
 * Transmission project are granted a special exemption to clause 2(b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id$
 */

#include <stdlib.h> /* qsort() */

#include <gtk/gtk.h>
#include <glib/gi18n.h>

#include <libtransmission/transmission.h>
#include <libtransmission/utils.h>

#include "favicon.h" /* gtr_get_favicon() */
#include "filter.h"
#include "hig.h" /* GUI_PAD */
#include "tr-core.h" /* MC_TORRENT */
#include "util.h" /* gtr_idle_add() */

static GQuark DIRTY_KEY = 0;
static GQuark SESSION_KEY = 0;
static GQuark TEXT_KEY = 0;
static GQuark TORRENT_MODEL_KEY = 0;

/***
****
****  CATEGORIES
****
***/

enum
{
    CAT_FILTER_TYPE_ALL,
    CAT_FILTER_TYPE_PRIVATE,
    CAT_FILTER_TYPE_PUBLIC,
    CAT_FILTER_TYPE_HOST,
    CAT_FILTER_TYPE_PARENT,
    CAT_FILTER_TYPE_PRI_HIGH,
    CAT_FILTER_TYPE_PRI_NORMAL,
    CAT_FILTER_TYPE_PRI_LOW,
    CAT_FILTER_TYPE_TAG,
    CAT_FILTER_TYPE_SEPARATOR,
};

enum
{
    CAT_FILTER_COL_NAME, /* human-readable name; ie, Legaltorrents */
    CAT_FILTER_COL_COUNT, /* how many matches there are */
    CAT_FILTER_COL_TYPE,
    CAT_FILTER_COL_HOST, /* pattern-matching text; ie, legaltorrents.com */
    CAT_FILTER_COL_PIXBUF,
    CAT_FILTER_N_COLS
};

static int
pstrcmp( const void * a, const void * b )
{
    return strcmp( *(const char**)a, *(const char**)b );
}

/* human-readable name; ie, Legaltorrents */
static char*
get_name_from_host( const char * host )
{
    char * name;
    const char * dot = strrchr( host, '.' );

    if( tr_addressIsIP( host ) )
        name = g_strdup( host );
    else if( dot )
        name = g_strndup( host, dot - host );
    else
        name = g_strdup( host );

    *name = g_ascii_toupper( *name );

    return name;
}

static void
category_model_update_count( GtkTreeStore * store, GtkTreeIter * iter, int n )
{
    int count;
    GtkTreeModel * model = GTK_TREE_MODEL( store );
    gtk_tree_model_get( model, iter, CAT_FILTER_COL_COUNT, &count, -1 );
    if( n != count )
        gtk_tree_store_set( store, iter, CAT_FILTER_COL_COUNT, n, -1 );
}

static void
favicon_ready_cb( gpointer pixbuf, gpointer vreference )
{
    GtkTreeIter iter;
    GtkTreeRowReference * reference = vreference;

    if( pixbuf != NULL )
    {
        GtkTreePath * path = gtk_tree_row_reference_get_path( reference );
        GtkTreeModel * model = gtk_tree_row_reference_get_model( reference );

        if( gtk_tree_model_get_iter( model, &iter, path ) )
            gtk_tree_store_set( GTK_TREE_STORE( model ), &iter,
                                CAT_FILTER_COL_PIXBUF, pixbuf,
                                -1 );

        gtk_tree_path_free( path );

        g_object_unref( pixbuf );
    }

    gtk_tree_row_reference_free( reference );
}

static gboolean
category_filter_model_update( GtkTreeStore * store )
{
    int i, n;
    int low = 0;
    int all = 0;
    int high = 0;
    int public = 0;
    int normal = 0;
    int private = 0;
    int store_pos;
    GtkTreeIter top;
    GtkTreeIter iter;
    GtkTreeModel * model = GTK_TREE_MODEL( store );
    GPtrArray * hosts = g_ptr_array_new( );
    GHashTable * hosts_hash = g_hash_table_new_full( g_str_hash, g_str_equal,
                                                     g_free, g_free );
    GObject * o = G_OBJECT( store );
    GtkTreeModel * tmodel = GTK_TREE_MODEL(
                                    g_object_get_qdata( o, TORRENT_MODEL_KEY ) );

    g_object_steal_qdata( o, DIRTY_KEY );

    /* Walk through all the torrents, tallying how many matches there are
     * for the various categories. Also make a sorted list of all tracker
     * hosts s.t. we can merge it with the existing list */
    if( gtk_tree_model_get_iter_first( tmodel, &iter )) do
    {
        tr_torrent * tor;
        const tr_info * inf;
        int keyCount;
        char ** keys;

        gtk_tree_model_get( tmodel, &iter, MC_TORRENT, &tor, -1 );
        inf = tr_torrentInfo( tor );
        keyCount = 0;
        keys = g_new( char*, inf->trackerCount );

        for( i=0, n=inf->trackerCount; i<n; ++i )
        {
            int k;
            int * count;
            char key[1024];

            gtr_get_host_from_url( key, sizeof( key ), inf->trackers[i].announce );
            count = g_hash_table_lookup( hosts_hash, key );
            if( count == NULL )
            {
                count = tr_new0( int, 1 );
                g_hash_table_insert( hosts_hash, g_strdup( key ), count );
                g_ptr_array_add( hosts, g_strdup( key ) );
            }

            for( k=0; k<keyCount; ++k )
                if( !strcmp( keys[k], key ) )
                    break;
            if( k==keyCount )
                keys[keyCount++] = g_strdup( key );
        }

        for( i=0; i<keyCount; ++i )
        {
            int * incrementme = g_hash_table_lookup( hosts_hash, keys[i] );
            ++*incrementme;
            g_free( keys[i] );
        }
        g_free( keys );

        ++all;

        if( inf->isPrivate )
            ++private;
        else
            ++public;

        switch( tr_torrentGetPriority( tor ) )
        {
            case TR_PRI_HIGH: ++high; break;
            case TR_PRI_LOW: ++low; break;
            default: ++normal; break;
        }
    }
    while( gtk_tree_model_iter_next( tmodel, &iter ) );
    qsort( hosts->pdata, hosts->len, sizeof(char*), pstrcmp );

    /* update the "all" count */
    gtk_tree_model_iter_children( model, &top, NULL );
    category_model_update_count( store, &top, all );

    /* skip separator */
    gtk_tree_model_iter_next( model, &top );

    /* update the "hosts" subtree */
    gtk_tree_model_iter_next( model, &top );
    for( i=store_pos=0, n=hosts->len ; ; )
    {
        const gboolean new_hosts_done = i >= n;
        const gboolean old_hosts_done = !gtk_tree_model_iter_nth_child( model, &iter, &top, store_pos );
        gboolean remove_row = FALSE;
        gboolean insert_row = FALSE;

        /* are we done yet? */
        if( new_hosts_done && old_hosts_done )
            break;

        /* decide what to do */
        if( new_hosts_done )
            remove_row = TRUE;
        else if( old_hosts_done )
            insert_row = TRUE;
        else {
            int cmp;
            char * host;
            gtk_tree_model_get( model, &iter, CAT_FILTER_COL_HOST, &host,  -1 );
            cmp = strcmp( host, hosts->pdata[i] );
            if( cmp < 0 )
                remove_row = TRUE;
            else if( cmp > 0 )
                insert_row = TRUE;
            g_free( host );
        }

        /* do something */
        if( remove_row ) {
            /* g_message( "removing row and incrementing i" ); */
            gtk_tree_store_remove( store, &iter );
        } else if( insert_row ) {
            GtkTreeIter add;
            GtkTreePath * path;
            GtkTreeRowReference * reference;
            tr_session * session = g_object_get_qdata( G_OBJECT( store ), SESSION_KEY );
            const char * host = hosts->pdata[i];
            char * name = get_name_from_host( host );
            const int count = *(int*)g_hash_table_lookup( hosts_hash, host );
            gtk_tree_store_insert_with_values( store, &add, &top, store_pos,
                CAT_FILTER_COL_HOST, host,
                CAT_FILTER_COL_NAME, name,
                CAT_FILTER_COL_COUNT, count,
                CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_HOST,
                -1 );
            path = gtk_tree_model_get_path( model, &add );
            reference = gtk_tree_row_reference_new( model, path );
            gtr_get_favicon( session, host, favicon_ready_cb, reference );
            gtk_tree_path_free( path );
            g_free( name );
            ++store_pos;
            ++i;
        } else { /* update row */
            const char * host = hosts->pdata[i];
            const int count = *(int*)g_hash_table_lookup( hosts_hash, host );
            category_model_update_count( store, &iter, count );
            ++store_pos;
            ++i;
        }
    }

    /* update the "public" subtree */
    gtk_tree_model_iter_next( model, &top );
    gtk_tree_model_iter_children( model, &iter, &top );
    category_model_update_count( store, &iter, public );
    gtk_tree_model_iter_next( model, &iter );
    category_model_update_count( store, &iter, private );

    /* update the "priority" subtree */
    gtk_tree_model_iter_next( model, &top );
    gtk_tree_model_iter_children( model, &iter, &top );
    category_model_update_count( store, &iter, high );
    gtk_tree_model_iter_next( model, &iter );
    category_model_update_count( store, &iter, normal );
    gtk_tree_model_iter_next( model, &iter );
    category_model_update_count( store, &iter, low );

    /* cleanup */
    g_ptr_array_foreach( hosts, (GFunc)g_free, NULL );
    g_ptr_array_free( hosts, TRUE );
    g_hash_table_unref( hosts_hash );
    return FALSE;
}

static GtkTreeModel *
category_filter_model_new( GtkTreeModel * tmodel )
{
    GtkTreeIter iter;
    const int invisible_number = -1; /* doesn't get rendered */
    GtkTreeStore * store = gtk_tree_store_new( CAT_FILTER_N_COLS,
                                               G_TYPE_STRING,
                                               G_TYPE_INT,
                                               G_TYPE_INT,
                                               G_TYPE_STRING,
                                               GDK_TYPE_PIXBUF );

    gtk_tree_store_insert_with_values( store, NULL, NULL, -1,
        CAT_FILTER_COL_NAME, _( "All" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_ALL,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, NULL, -1,
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_SEPARATOR,
        -1 );

    gtk_tree_store_insert_with_values( store, &iter, NULL, -1,
        CAT_FILTER_COL_NAME, _( "Trackers" ),
        CAT_FILTER_COL_COUNT, invisible_number,
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PARENT,
        -1 );

    gtk_tree_store_insert_with_values( store, &iter, NULL, -1,
        CAT_FILTER_COL_NAME, _( "Privacy" ),
        CAT_FILTER_COL_COUNT, invisible_number,
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PARENT,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, &iter, -1,
        CAT_FILTER_COL_NAME, _( "Public" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PUBLIC,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, &iter, -1,
        CAT_FILTER_COL_NAME, _( "Private" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PRIVATE,
        -1 );

    gtk_tree_store_insert_with_values( store, &iter, NULL, -1,
        CAT_FILTER_COL_NAME, _( "Priority" ),
        CAT_FILTER_COL_COUNT, invisible_number,
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PARENT,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, &iter, -1,
        CAT_FILTER_COL_NAME, _( "High" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PRI_HIGH,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, &iter, -1,
        CAT_FILTER_COL_NAME, _( "Normal" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PRI_NORMAL,
        -1 );
    gtk_tree_store_insert_with_values( store, NULL, &iter, -1,
        CAT_FILTER_COL_NAME, _( "Low" ),
        CAT_FILTER_COL_TYPE, CAT_FILTER_TYPE_PRI_LOW,
        -1 );

    g_object_set_qdata( G_OBJECT( store ), TORRENT_MODEL_KEY, tmodel );
    category_filter_model_update( store );
    return GTK_TREE_MODEL( store );
}

static gboolean
is_it_a_separator( GtkTreeModel * m, GtkTreeIter * iter, gpointer data UNUSED )
{
    int type;
    gtk_tree_model_get( m, iter, CAT_FILTER_COL_TYPE, &type, -1 );
    return type == CAT_FILTER_TYPE_SEPARATOR;
}

static void
category_model_update_idle( gpointer category_model )
{
    GObject * o = G_OBJECT( category_model );
    const gboolean pending = g_object_get_qdata( o, DIRTY_KEY ) != NULL;
    if( !pending )
    {
        GSourceFunc func = (GSourceFunc) category_filter_model_update;
        g_object_set_qdata( o, DIRTY_KEY, GINT_TO_POINTER(1) );
        gtr_idle_add( func, category_model );
    }
}

static void
torrent_model_row_changed( GtkTreeModel  * tmodel UNUSED,
                           GtkTreePath   * path UNUSED,
                           GtkTreeIter   * iter UNUSED,
                           gpointer        category_model )
{
    category_model_update_idle( category_model );
}

static void
torrent_model_row_deleted_cb( GtkTreeModel * tmodel UNUSED,
                              GtkTreePath  * path UNUSED,
                              gpointer       category_model )
{
    category_model_update_idle( category_model );
}

static void
render_pixbuf_func( GtkCellLayout    * cell_layout UNUSED,
                    GtkCellRenderer  * cell_renderer,
                    GtkTreeModel     * tree_model,
                    GtkTreeIter      * iter,
                    gpointer           data UNUSED )
{
    int type;
    int width = 0;
    const gboolean leaf = !gtk_tree_model_iter_has_child( tree_model, iter );

    gtk_tree_model_get( tree_model, iter, CAT_FILTER_COL_TYPE, &type, -1 );
    if( type == CAT_FILTER_TYPE_HOST )
        width = 20;

    g_object_set( cell_renderer, "width", width,
                                 "sensitive", leaf,
                                 NULL );
}

static void
is_capital_sensitive( GtkCellLayout   * cell_layout UNUSED,
                      GtkCellRenderer * cell_renderer,
                      GtkTreeModel    * tree_model,
                      GtkTreeIter     * iter,
                      gpointer          data UNUSED )
{
    const gboolean leaf = !gtk_tree_model_iter_has_child( tree_model, iter );

    g_object_set( cell_renderer, "sensitive", leaf,
                                 NULL );
}

static void
render_number_func( GtkCellLayout    * cell_layout UNUSED,
                    GtkCellRenderer  * cell_renderer,
                    GtkTreeModel     * tree_model,
                    GtkTreeIter      * iter,
                    gpointer           data UNUSED )
{
    int count;
    char buf[32];
    const gboolean leaf = !gtk_tree_model_iter_has_child( tree_model, iter );

    gtk_tree_model_get( tree_model, iter, CAT_FILTER_COL_COUNT, &count, -1 );

    if( count >= 0 )
        g_snprintf( buf, sizeof( buf ), "%'d", count );
    else
        *buf = '\0';

    g_object_set( cell_renderer, "text", buf,
                                 "sensitive", leaf,
                                 NULL );
}

static GtkCellRenderer *
number_renderer_new( void )
{
    GtkCellRenderer * r = gtk_cell_renderer_text_new( );

    g_object_set( G_OBJECT( r ), "alignment", PANGO_ALIGN_RIGHT,
                                 "weight", PANGO_WEIGHT_ULTRALIGHT,
                                 "xalign", 1.0,
                                 "xpad", GUI_PAD,
                                 NULL );

    return r;
}

static void
disconnect_cat_model_callbacks( gpointer tmodel, GObject * cat_model )
{
    g_signal_handlers_disconnect_by_func( tmodel, torrent_model_row_changed, cat_model );
    g_signal_handlers_disconnect_by_func( tmodel, torrent_model_row_deleted_cb, cat_model );
}

static GtkWidget *
category_combo_box_new( GtkTreeModel * tmodel )
{
    GtkWidget * c;
    GtkCellRenderer * r;
    GtkTreeModel * cat_model;

    /* create the category combobox */
    cat_model = category_filter_model_new( tmodel );
    c = gtk_combo_box_new_with_model( cat_model );
    g_object_unref( cat_model );
    gtk_combo_box_set_row_separator_func( GTK_COMBO_BOX( c ),
                                          is_it_a_separator, NULL, NULL );
    gtk_combo_box_set_active( GTK_COMBO_BOX( c ), 0 );

    r = gtk_cell_renderer_pixbuf_new( );
    gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( c ), r, FALSE );
    gtk_cell_layout_set_cell_data_func( GTK_CELL_LAYOUT( c ), r,
                                        render_pixbuf_func, NULL, NULL );
    gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( c ), r,
                                    "pixbuf", CAT_FILTER_COL_PIXBUF,
                                    NULL );

    r = gtk_cell_renderer_text_new( );
    gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( c ), r, FALSE );
    gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( c ), r,
                                    "text", CAT_FILTER_COL_NAME,
                                    NULL );
    gtk_cell_layout_set_cell_data_func( GTK_CELL_LAYOUT( c ), r,
                                        is_capital_sensitive,
                                        NULL, NULL);


    r = number_renderer_new( );
    gtk_cell_layout_pack_end( GTK_CELL_LAYOUT( c ), r, TRUE );
    gtk_cell_layout_set_cell_data_func( GTK_CELL_LAYOUT( c ), r,
                                        render_number_func, NULL, NULL );

    g_object_weak_ref( G_OBJECT( cat_model ), disconnect_cat_model_callbacks, tmodel );
    g_signal_connect( tmodel, "row-changed", G_CALLBACK( torrent_model_row_changed ), cat_model );
    g_signal_connect( tmodel, "row-inserted", G_CALLBACK( torrent_model_row_changed ), cat_model );
    g_signal_connect( tmodel, "row-deleted", G_CALLBACK( torrent_model_row_deleted_cb ), cat_model );

    return c;
}

static gboolean
testCategory( GtkWidget * category_combo, tr_torrent * tor )
{
    int type;
    const tr_info * inf;
    GtkTreeIter iter;
    GtkComboBox * combo = GTK_COMBO_BOX( category_combo );
    GtkTreeModel * model = gtk_combo_box_get_model( combo );

    if( !gtk_combo_box_get_active_iter( combo, &iter ) )
        return TRUE;

    inf = tr_torrentInfo( tor );
    gtk_tree_model_get( model, &iter, CAT_FILTER_COL_TYPE, &type, -1 );
    switch( type )
    {
        case CAT_FILTER_TYPE_ALL:
            return TRUE;

        case CAT_FILTER_TYPE_PRIVATE:
            return inf->isPrivate;

        case CAT_FILTER_TYPE_PUBLIC:
            return !inf->isPrivate;

        case CAT_FILTER_TYPE_PRI_HIGH:
            return tr_torrentGetPriority( tor ) == TR_PRI_HIGH;

        case CAT_FILTER_TYPE_PRI_NORMAL:
            return tr_torrentGetPriority( tor ) == TR_PRI_NORMAL;

        case CAT_FILTER_TYPE_PRI_LOW:
            return tr_torrentGetPriority( tor ) == TR_PRI_LOW;

        case CAT_FILTER_TYPE_HOST: {
            int i;
            char * host;
            char tmp[1024];
            gtk_tree_model_get( model, &iter, CAT_FILTER_COL_HOST, &host, -1 );
            for( i=0; i<inf->trackerCount; ++i ) {
                gtr_get_host_from_url( tmp, sizeof( tmp ), inf->trackers[i].announce );
                if( !strcmp( tmp, host ) )
                    break;
            }
            g_free( host );
            return i < inf->trackerCount;
        }

        case CAT_FILTER_TYPE_TAG:
            /* FIXME */
            return TRUE;

        default:
            return TRUE;
    }
}

/***
****
****  ACTIVITY
****
***/

enum
{
    ACTIVITY_FILTER_ALL,
    ACTIVITY_FILTER_DOWNLOADING,
    ACTIVITY_FILTER_SEEDING,
    ACTIVITY_FILTER_ACTIVE,
    ACTIVITY_FILTER_PAUSED,
    ACTIVITY_FILTER_FINISHED,
    ACTIVITY_FILTER_QUEUED,
    ACTIVITY_FILTER_VERIFYING,
    ACTIVITY_FILTER_ERROR,
    ACTIVITY_FILTER_SEPARATOR
};

enum
{
    ACTIVITY_FILTER_COL_NAME,
    ACTIVITY_FILTER_COL_COUNT,
    ACTIVITY_FILTER_COL_TYPE,
    ACTIVITY_FILTER_COL_STOCK_ID,
    ACTIVITY_FILTER_N_COLS
};

static gboolean
activity_is_it_a_separator( GtkTreeModel * m, GtkTreeIter * i, gpointer d UNUSED )
{
    int type;
    gtk_tree_model_get( m, i, ACTIVITY_FILTER_COL_TYPE, &type, -1 );
    return type == ACTIVITY_FILTER_SEPARATOR;
}

static gboolean
test_torrent_activity( tr_torrent * tor, int type )
{
    const tr_stat * st = tr_torrentStatCached( tor );

    switch( type )
    {
        case ACTIVITY_FILTER_DOWNLOADING:
            return st->activity == TR_STATUS_DOWNLOAD;

        case ACTIVITY_FILTER_SEEDING:
            return st->activity == TR_STATUS_SEED;

        case ACTIVITY_FILTER_ACTIVE:
            return ( st->peersSendingToUs > 0 )
                || ( st->peersGettingFromUs > 0 )
                || ( st->webseedsSendingToUs > 0 )
                || ( st->activity == TR_STATUS_CHECK );

        case ACTIVITY_FILTER_PAUSED:
            return st->activity == TR_STATUS_STOPPED;

        case ACTIVITY_FILTER_FINISHED:
            return st->finished == TRUE;

        case ACTIVITY_FILTER_QUEUED:
            return st->activity == TR_STATUS_CHECK_WAIT;

        case ACTIVITY_FILTER_VERIFYING:
            return ( st->activity == TR_STATUS_CHECK ) || ( st->activity == TR_STATUS_CHECK_WAIT );

        case ACTIVITY_FILTER_ERROR:
            return st->error != 0;

        default: /* ACTIVITY_FILTER_ALL */
            return TRUE;
    }
}

static gboolean
testActivity( GtkWidget * activity_combo, tr_torrent * tor )
{
    int type;
    GtkTreeIter iter;
    GtkComboBox * combo = GTK_COMBO_BOX( activity_combo );
    GtkTreeModel * model = gtk_combo_box_get_model( combo );

    if( !gtk_combo_box_get_active_iter( combo, &iter ) )
        return TRUE;

    gtk_tree_model_get( model, &iter, ACTIVITY_FILTER_COL_TYPE, &type, -1 );
    return test_torrent_activity( tor, type );
}

static void
status_model_update_count( GtkListStore * store, GtkTreeIter * iter, int n )
{
    int count;
    GtkTreeModel * model = GTK_TREE_MODEL( store );
    gtk_tree_model_get( model, iter, ACTIVITY_FILTER_COL_COUNT, &count, -1 );
    if( n != count )
        gtk_list_store_set( store, iter, ACTIVITY_FILTER_COL_COUNT, n, -1 );
}

static void
activity_filter_model_update( GtkListStore * store )
{
    GtkTreeIter iter;
    GtkTreeModel * model = GTK_TREE_MODEL( store );
    GObject * o = G_OBJECT( store );
    GtkTreeModel * tmodel = GTK_TREE_MODEL( g_object_get_qdata( o, TORRENT_MODEL_KEY ) );

    g_object_steal_qdata( o, DIRTY_KEY );

    if( gtk_tree_model_get_iter_first( model, &iter )) do
    {
        int hits;
        int type;
        GtkTreeIter torrent_iter;

        gtk_tree_model_get( model, &iter, ACTIVITY_FILTER_COL_TYPE, &type, -1 );

        hits = 0;
        if( gtk_tree_model_get_iter_first( tmodel, &torrent_iter )) do {
            tr_torrent * tor;
            gtk_tree_model_get( tmodel, &torrent_iter, MC_TORRENT, &tor, -1 );
            if( test_torrent_activity( tor, type ) )
                ++hits;
        } while( gtk_tree_model_iter_next( tmodel, &torrent_iter ) );

        status_model_update_count( store, &iter, hits );

    } while( gtk_tree_model_iter_next( model, &iter ) );
}

static GtkTreeModel *
activity_filter_model_new( GtkTreeModel * tmodel )
{
    int i, n;
    struct {
        int type;
        const char * name;
        const char * stock_id;
    } types[] = {
        { ACTIVITY_FILTER_ALL, N_( "All" ), NULL },
        { ACTIVITY_FILTER_SEPARATOR, NULL, NULL },
        { ACTIVITY_FILTER_ACTIVE, N_( "Active" ), GTK_STOCK_EXECUTE },
        { ACTIVITY_FILTER_DOWNLOADING, N_( "Downloading" ), GTK_STOCK_GO_DOWN },
        { ACTIVITY_FILTER_SEEDING, N_( "Seeding" ), GTK_STOCK_GO_UP },
        { ACTIVITY_FILTER_PAUSED, N_( "Paused" ), GTK_STOCK_MEDIA_PAUSE },
        { ACTIVITY_FILTER_FINISHED, N_( "Finished" ), NULL },
        { ACTIVITY_FILTER_QUEUED, N_( "Queued" ), NULL },
        { ACTIVITY_FILTER_VERIFYING, N_( "Verifying" ), GTK_STOCK_REFRESH },
        { ACTIVITY_FILTER_ERROR, N_( "Error" ), GTK_STOCK_DIALOG_ERROR }
    };
    GtkListStore * store = gtk_list_store_new( ACTIVITY_FILTER_N_COLS,
                                               G_TYPE_STRING,
                                               G_TYPE_INT,
                                               G_TYPE_INT,
                                               G_TYPE_STRING );
    for( i=0, n=G_N_ELEMENTS(types); i<n; ++i )
        gtk_list_store_insert_with_values( store, NULL, -1,
            ACTIVITY_FILTER_COL_NAME, _( types[i].name ),
            ACTIVITY_FILTER_COL_TYPE, types[i].type,
            ACTIVITY_FILTER_COL_STOCK_ID, types[i].stock_id,
            -1 );

    g_object_set_qdata( G_OBJECT( store ), TORRENT_MODEL_KEY, tmodel );
    activity_filter_model_update( store );
    return GTK_TREE_MODEL( store );
}

static void
render_activity_pixbuf_func( GtkCellLayout    * cell_layout UNUSED,
                             GtkCellRenderer  * cell_renderer,
                             GtkTreeModel     * tree_model,
                             GtkTreeIter      * iter,
                             gpointer           data UNUSED )
{
    int type;
    int width;
    int ypad;
    const gboolean leaf = !gtk_tree_model_iter_has_child( tree_model, iter );

    gtk_tree_model_get( tree_model, iter, ACTIVITY_FILTER_COL_TYPE, &type, -1 );
    width = type == ACTIVITY_FILTER_ALL ? 0 : 20;
    ypad = type == ACTIVITY_FILTER_ALL ? 0 : 2;

    g_object_set( cell_renderer, "width", width,
                                 "sensitive", leaf,
                                 "ypad", ypad,
                                 NULL );
}

static void
activity_model_update_idle( gpointer activity_model )
{
    GObject * o = G_OBJECT( activity_model );
    const gboolean pending = g_object_get_qdata( o, DIRTY_KEY ) != NULL;
    if( !pending )
    {
        GSourceFunc func = (GSourceFunc) activity_filter_model_update;
        g_object_set_qdata( o, DIRTY_KEY, GINT_TO_POINTER(1) );
        gtr_idle_add( func, activity_model );
    }
}

static void
activity_torrent_model_row_changed( GtkTreeModel  * tmodel UNUSED,
                                    GtkTreePath   * path UNUSED,
                                    GtkTreeIter   * iter UNUSED,
                                    gpointer        activity_model )
{
    activity_model_update_idle( activity_model );
}

static void
activity_torrent_model_row_deleted_cb( GtkTreeModel  * tmodel UNUSED,
                                       GtkTreePath   * path UNUSED,
                                       gpointer        activity_model )
{
    activity_model_update_idle( activity_model );
}

static void
disconnect_activity_model_callbacks( gpointer tmodel, GObject * cat_model )
{
    g_signal_handlers_disconnect_by_func( tmodel, activity_torrent_model_row_changed, cat_model );
    g_signal_handlers_disconnect_by_func( tmodel, activity_torrent_model_row_deleted_cb, cat_model );
}

static GtkWidget *
activity_combo_box_new( GtkTreeModel * tmodel )
{
    GtkWidget * c;
    GtkCellRenderer * r;
    GtkTreeModel * activity_model;

    activity_model = activity_filter_model_new( tmodel );
    c = gtk_combo_box_new_with_model( activity_model );
    g_object_unref( activity_model );
    gtk_combo_box_set_row_separator_func( GTK_COMBO_BOX( c ),
                                       activity_is_it_a_separator, NULL, NULL );
    gtk_combo_box_set_active( GTK_COMBO_BOX( c ), 0 );

    r = gtk_cell_renderer_pixbuf_new( );
    gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( c ), r, FALSE );
    gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( c ), r,
                                    "stock-id", ACTIVITY_FILTER_COL_STOCK_ID,
                                    NULL );
    gtk_cell_layout_set_cell_data_func( GTK_CELL_LAYOUT( c ), r,
                                        render_activity_pixbuf_func, NULL, NULL );

    r = gtk_cell_renderer_text_new( );
    gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( c ), r, TRUE );
    gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( c ), r,
                                    "text", ACTIVITY_FILTER_COL_NAME,
                                    NULL );

    r = number_renderer_new( );
    gtk_cell_layout_pack_end( GTK_CELL_LAYOUT( c ), r, TRUE );
    gtk_cell_layout_set_cell_data_func( GTK_CELL_LAYOUT( c ), r,
                                        render_number_func, NULL, NULL );

    g_object_weak_ref( G_OBJECT( activity_model ), disconnect_activity_model_callbacks, tmodel );
    g_signal_connect( tmodel, "row-changed", G_CALLBACK( activity_torrent_model_row_changed ), activity_model );
    g_signal_connect( tmodel, "row-inserted", G_CALLBACK( activity_torrent_model_row_changed ), activity_model );
    g_signal_connect( tmodel, "row-deleted", G_CALLBACK( activity_torrent_model_row_deleted_cb ), activity_model );

    return c;
}

/****
*****
*****  ENTRY FIELD
*****
****/

static gboolean
testText( const tr_torrent * tor, const char * key )
{
    gboolean ret = FALSE;

    if( !key || !*key )
    {
        ret = TRUE;
    }
    else
    {
        tr_file_index_t i;
        const tr_info * inf = tr_torrentInfo( tor );

        for( i=0; i<inf->fileCount && !ret; ++i )
        {
            char * pch = g_utf8_casefold( inf->files[i].name, -1 );
            ret = !key || strstr( pch, key ) != NULL;
            g_free( pch );
        }
    }

    return ret;
}

static void
entry_clear( GtkEntry * e )
{
    gtk_entry_set_text( e, "" );
}

static void
filter_entry_changed( GtkEditable * e, gpointer filter_model )
{
    char * pch;
    char * folded;

    pch = gtk_editable_get_chars( e, 0, -1 );
    folded = g_utf8_casefold( pch, -1 );
    g_strstrip( folded );
    g_object_set_qdata_full( filter_model, TEXT_KEY, folded, g_free );
    g_free( pch );

    gtk_tree_model_filter_refilter( GTK_TREE_MODEL_FILTER( filter_model ) );
}

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

struct filter_data
{
    GtkWidget * activity;
    GtkWidget * category;
    GtkWidget * entry;
    GtkTreeModel * filter_model;
};

static gboolean
is_row_visible( GtkTreeModel * model, GtkTreeIter * iter, gpointer vdata )
{
    const char * text;
    tr_torrent * tor;
    struct filter_data * data = vdata;
    GObject * o = G_OBJECT( data->filter_model );

    gtk_tree_model_get( model, iter, MC_TORRENT, &tor, -1 );

    text = (const char*) g_object_get_qdata( o, TEXT_KEY );

    return ( tor != NULL ) && testCategory( data->category, tor )
                           && testActivity( data->activity, tor )
                           && testText( tor, text );
}

static void
selection_changed_cb( GtkComboBox * combo UNUSED, gpointer vdata )
{
    struct filter_data * data = vdata;
    gtk_tree_model_filter_refilter( GTK_TREE_MODEL_FILTER( data->filter_model ) );
}

GtkWidget *
gtr_filter_bar_new( tr_session * session, GtkTreeModel * tmodel, GtkTreeModel ** filter_model )
{
    GtkWidget * l;
    GtkWidget * w;
    GtkWidget * h;
    GtkWidget * s;
    GtkWidget * activity;
    GtkWidget * category;
    const char * str;
    struct filter_data * data;

    g_assert( DIRTY_KEY == 0 );
    TEXT_KEY = g_quark_from_static_string( "tr-filter-text-key" );
    DIRTY_KEY = g_quark_from_static_string( "tr-filter-dirty-key" );
    SESSION_KEY = g_quark_from_static_string( "tr-session-key" );
    TORRENT_MODEL_KEY = g_quark_from_static_string( "tr-filter-torrent-model-key" );

    data = g_new( struct filter_data, 1 );
    data->activity = activity = activity_combo_box_new( tmodel );
    data->category = category = category_combo_box_new( tmodel );
    data->entry = NULL;
    data->filter_model = gtk_tree_model_filter_new( tmodel, NULL );

    g_object_set( G_OBJECT( data->category ), "width-request", 170, NULL );
    g_object_set_qdata( G_OBJECT( gtk_combo_box_get_model( GTK_COMBO_BOX( data->category ) ) ), SESSION_KEY, session );

    gtk_tree_model_filter_set_visible_func(
        GTK_TREE_MODEL_FILTER( data->filter_model ),
        is_row_visible, data, g_free );

    g_signal_connect( data->category, "changed", G_CALLBACK( selection_changed_cb ), data );
    g_signal_connect( data->activity, "changed", G_CALLBACK( selection_changed_cb ), data );


    h = gtk_hbox_new( FALSE, GUI_PAD_SMALL );

    /* add the activity combobox */
    str = _( "_Show:" );
    w = activity;
    l = gtk_label_new( NULL );
    gtk_label_set_markup_with_mnemonic( GTK_LABEL( l ), str );
    gtk_label_set_mnemonic_widget( GTK_LABEL( l ), w );
    gtk_box_pack_start( GTK_BOX( h ), l, FALSE, FALSE, 0 );
    gtk_box_pack_start( GTK_BOX( h ), w, TRUE, TRUE, 0 );

    /* add a spacer */
    w = gtk_alignment_new( 0.0f, 0.0f, 0.0f, 0.0f );
    gtk_widget_set_size_request( w, 0u, GUI_PAD_BIG );
    gtk_box_pack_start( GTK_BOX( h ), w, FALSE, FALSE, 0 );

    /* add the category combobox */
    w = category;
    gtk_box_pack_start( GTK_BOX( h ), w, TRUE, TRUE, 0 );

    /* add a spacer */
    w = gtk_alignment_new( 0.0f, 0.0f, 0.0f, 0.0f );
    gtk_widget_set_size_request( w, 0u, GUI_PAD_BIG );
    gtk_box_pack_start( GTK_BOX( h ), w, FALSE, FALSE, 0 );

    /* add the entry field */
#if GTK_CHECK_VERSION( 2,16,0 )
    s = gtk_entry_new( );
    gtk_entry_set_icon_from_stock( GTK_ENTRY( s ), GTK_ENTRY_ICON_SECONDARY, GTK_STOCK_CLEAR );
    g_signal_connect( s, "icon-release", G_CALLBACK( entry_clear ), NULL );
    gtk_box_pack_start( GTK_BOX( h ), s, TRUE, TRUE, 0 );
#else
    s = gtk_entry_new( );
    gtk_box_pack_start( GTK_BOX( h ), s, TRUE, TRUE, 0 );
    w = gtk_button_new( );
    gtk_button_set_relief( GTK_BUTTON( w ), GTK_RELIEF_NONE );
    l = gtk_image_new_from_stock( GTK_STOCK_CLEAR, GTK_ICON_SIZE_MENU );
    gtk_button_set_image( GTK_BUTTON( w ), l );
    gtk_box_pack_start( GTK_BOX( h ), w, FALSE, FALSE, 0 );
    g_signal_connect_swapped( w, "clicked", G_CALLBACK( entry_clear ), s );
#endif

    g_signal_connect( s, "changed", G_CALLBACK( filter_entry_changed ), data->filter_model );

    *filter_model = data->filter_model;
    return h;
}