playlist.cpp

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#include "foobar2000.h"

namespace {
    class enum_items_callback_retrieve_item : public playlist_manager::enum_items_callback
    {
        metadb_handle_ptr m_item;
    public:
        enum_items_callback_retrieve_item() : m_item(0) {}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            assert(m_item.is_empty());
            m_item = p_location;
            return false;
        }
        inline const metadb_handle_ptr & get_item() {return m_item;}
    };

    class enum_items_callback_retrieve_selection : public playlist_manager::enum_items_callback
    {
        bool m_state;
    public:
        enum_items_callback_retrieve_selection() : m_state(false) {}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            m_state = b_selected;
            return false;
        }
        inline bool get_state() {return m_state;}
    };

    class enum_items_callback_retrieve_selection_mask : public playlist_manager::enum_items_callback
    {
        bit_array_var & m_out;
    public:
        enum_items_callback_retrieve_selection_mask(bit_array_var & p_out) : m_out(p_out) {}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            m_out.set(p_index,b_selected);
            return true;
        }
    };

    class enum_items_callback_retrieve_all_items : public playlist_manager::enum_items_callback
    {
        pfc::list_base_t<metadb_handle_ptr> & m_out;
    public:
        enum_items_callback_retrieve_all_items(pfc::list_base_t<metadb_handle_ptr> & p_out) : m_out(p_out) {m_out.remove_all();}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            m_out.add_item(p_location);
            return true;
        }
    };

    class enum_items_callback_retrieve_selected_items : public playlist_manager::enum_items_callback
    {
        pfc::list_base_t<metadb_handle_ptr> & m_out;
    public:
        enum_items_callback_retrieve_selected_items(pfc::list_base_t<metadb_handle_ptr> & p_out) : m_out(p_out) {m_out.remove_all();}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            if (b_selected) m_out.add_item(p_location);
            return true;
        }
    };

    class enum_items_callback_count_selection : public playlist_manager::enum_items_callback
    {
        t_size m_counter,m_max;
    public:
        enum_items_callback_count_selection(t_size p_max) : m_max(p_max), m_counter(0) {}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            if (b_selected) 
            {
                if (++m_counter >= m_max) return false;
            }
            return true;
        }
        
        inline t_size get_count() {return m_counter;}
    };

}

void playlist_manager::playlist_get_all_items(t_size p_playlist,pfc::list_base_t<metadb_handle_ptr> & out)
{
    playlist_get_items(p_playlist,out,bit_array_true());
}

void playlist_manager::playlist_get_selected_items(t_size p_playlist,pfc::list_base_t<metadb_handle_ptr> & out)
{
    playlist_enum_items(p_playlist,enum_items_callback_retrieve_selected_items(out),bit_array_true());
}

void playlist_manager::playlist_get_selection_mask(t_size p_playlist,bit_array_var & out)
{
    playlist_enum_items(p_playlist,enum_items_callback_retrieve_selection_mask(out),bit_array_true());
}

bool playlist_manager::playlist_is_item_selected(t_size p_playlist,t_size p_item)
{
    enum_items_callback_retrieve_selection callback;
    playlist_enum_items(p_playlist,callback,bit_array_one(p_item));
    return callback.get_state();
}

metadb_handle_ptr playlist_manager::playlist_get_item_handle(t_size playlist, t_size item) {
    metadb_handle_ptr temp;
    if (!playlist_get_item_handle(temp, playlist, item)) throw pfc::exception_invalid_params();
    PFC_ASSERT( temp.is_valid() );
    return temp;

}
bool playlist_manager::playlist_get_item_handle(metadb_handle_ptr & p_out,t_size p_playlist,t_size p_item)
{
    enum_items_callback_retrieve_item callback;
    playlist_enum_items(p_playlist,callback,bit_array_one(p_item));
    p_out = callback.get_item();
    return p_out.is_valid();
}

void playlist_manager::g_make_selection_move_permutation(t_size * p_output,t_size p_count,const bit_array & p_selection,int p_delta) {
    pfc::create_move_items_permutation(p_output,p_count,p_selection,p_delta);
}

bool playlist_manager::playlist_move_selection(t_size p_playlist,int p_delta) {
    if (p_delta==0) return true;
    
    t_size count = playlist_get_item_count(p_playlist);
    
    pfc::array_t<t_size> order; order.set_size(count);
    pfc::array_t<bool> selection; selection.set_size(count);
    
    playlist_get_selection_mask(p_playlist,bit_array_var_table(selection.get_ptr(),selection.get_size()));
    g_make_selection_move_permutation(order.get_ptr(),count,bit_array_table(selection.get_ptr(),selection.get_size()),p_delta);
    return playlist_reorder_items(p_playlist,order.get_ptr(),count);
}

//retrieving status
t_size playlist_manager::activeplaylist_get_item_count()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return 0;
    else return playlist_get_item_count(playlist);
}

void playlist_manager::activeplaylist_enum_items(enum_items_callback & p_callback,const bit_array & p_mask)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_enum_items(playlist,p_callback,p_mask);
}

t_size playlist_manager::activeplaylist_get_focus_item()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return pfc_infinite;
    else return playlist_get_focus_item(playlist);
}

bool playlist_manager::activeplaylist_get_name(pfc::string_base & p_out)
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return false;
    else return playlist_get_name(playlist,p_out);
}

//modifying playlist
bool playlist_manager::activeplaylist_reorder_items(const t_size * order,t_size count)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_reorder_items(playlist,order,count);
    else return false;
}

void playlist_manager::activeplaylist_set_selection(const bit_array & affected,const bit_array & status)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_set_selection(playlist,affected,status);
}

bool playlist_manager::activeplaylist_remove_items(const bit_array & mask)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_remove_items(playlist,mask);
    else return false;
}

bool playlist_manager::activeplaylist_replace_item(t_size p_item,const metadb_handle_ptr & p_new_item)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_replace_item(playlist,p_item,p_new_item);
    else return false;
}

void playlist_manager::activeplaylist_set_focus_item(t_size p_item)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_set_focus_item(playlist,p_item);
}

t_size playlist_manager::activeplaylist_insert_items(t_size p_base,const pfc::list_base_const_t<metadb_handle_ptr> & data,const bit_array & p_selection)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_insert_items(playlist,p_base,data,p_selection);
    else return pfc_infinite;
}

void playlist_manager::activeplaylist_ensure_visible(t_size p_item)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_ensure_visible(playlist,p_item);
}

bool playlist_manager::activeplaylist_rename(const char * p_name,t_size p_name_len)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_rename(playlist,p_name,p_name_len);
    else return false;
}

bool playlist_manager::activeplaylist_is_item_selected(t_size p_item)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_is_item_selected(playlist,p_item);
    else return false;
}

metadb_handle_ptr playlist_manager::activeplaylist_get_item_handle(t_size p_item) {
    metadb_handle_ptr temp;
    if (!activeplaylist_get_item_handle(temp, p_item)) throw pfc::exception_invalid_params();
    PFC_ASSERT( temp.is_valid() );
    return temp;
}
bool playlist_manager::activeplaylist_get_item_handle(metadb_handle_ptr & p_out,t_size p_item)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_get_item_handle(p_out,playlist,p_item);
    else return false;
}

void playlist_manager::activeplaylist_move_selection(int p_delta)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_move_selection(playlist,p_delta);
}

void playlist_manager::activeplaylist_get_selection_mask(bit_array_var & out)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_get_selection_mask(playlist,out);
}

void playlist_manager::activeplaylist_get_all_items(pfc::list_base_t<metadb_handle_ptr> & out)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_get_all_items(playlist,out);
}

void playlist_manager::activeplaylist_get_selected_items(pfc::list_base_t<metadb_handle_ptr> & out)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_get_selected_items(playlist,out);
}

bool playlist_manager::remove_playlist(t_size idx)
{
    return remove_playlists(bit_array_one(idx));
}

bool playlist_incoming_item_filter::process_location(const char * url,pfc::list_base_t<metadb_handle_ptr> & out,bool filter,const char * p_mask,const char * p_exclude,HWND p_parentwnd)
{
    return process_locations(pfc::list_single_ref_t<const char*>(url),out,filter,p_mask,p_exclude,p_parentwnd);
}

void playlist_manager::playlist_clear(t_size p_playlist)
{
    playlist_remove_items(p_playlist,bit_array_true());
}

void playlist_manager::activeplaylist_clear()
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_clear(playlist);
}

bool playlist_manager::playlist_update_content(t_size playlist, metadb_handle_list_cref content, bool bUndoBackup) {
    metadb_handle_list old;
    playlist_get_all_items(playlist, old);
    if (old.get_size() == 0) {
        if (content.get_size() == 0) return false;
        if (bUndoBackup) playlist_undo_backup(playlist);
        playlist_add_items(playlist, content, bit_array_false());
        return true;
    }
    pfc::avltree_t<metadb_handle::nnptr> itemsOld, itemsNew;

    for(t_size walk = 0; walk < old.get_size(); ++walk) itemsOld += old[walk];
    for(t_size walk = 0; walk < content.get_size(); ++walk) itemsNew += content[walk];
    bit_array_bittable removeMask(old.get_size());
    bit_array_bittable filterMask(content.get_size());
    bool gotNew = false, filterNew = false, gotRemove = false;
    for(t_size walk = 0; walk < content.get_size(); ++walk) {
        const bool state = !itemsOld.have_item(content[walk]);
        if (state) gotNew = true;
        else filterNew = true;
        filterMask.set(walk, state);
    }
    for(t_size walk = 0; walk < old.get_size(); ++walk) {
        const bool state = !itemsNew.have_item(old[walk]);
        if (state) gotRemove = true;
        removeMask.set(walk, state);
    }
    if (!gotNew && !gotRemove) return false;
    if (bUndoBackup) playlist_undo_backup(playlist);
    if (gotRemove) {
        playlist_remove_items(playlist, removeMask);
    }
    if (gotNew) {
        if (filterNew) {
            metadb_handle_list temp(content);
            temp.filter_mask(filterMask);
            playlist_add_items(playlist, temp, bit_array_false());
        } else {
            playlist_add_items(playlist, content, bit_array_false());
        }
    }

    {
        playlist_get_all_items(playlist, old);
        pfc::array_t<t_size> order;
        if (pfc::guess_reorder_pattern<pfc::list_base_const_t<metadb_handle_ptr> >(order, old, content)) {
            playlist_reorder_items(playlist, order.get_ptr(), order.get_size());
        }
    }
    return true;
}
bool playlist_manager::playlist_add_items(t_size playlist,const pfc::list_base_const_t<metadb_handle_ptr> & data,const bit_array & p_selection)
{
    return playlist_insert_items(playlist,pfc_infinite,data,p_selection) != pfc_infinite;
}

bool playlist_manager::activeplaylist_add_items(const pfc::list_base_const_t<metadb_handle_ptr> & data,const bit_array & p_selection)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_add_items(playlist,data,p_selection);
    else return false;
}

bool playlist_manager::playlist_insert_items_filter(t_size p_playlist,t_size p_base,const pfc::list_base_const_t<metadb_handle_ptr> & p_data,bool p_select)
{
    metadb_handle_list temp;
    static_api_ptr_t<playlist_incoming_item_filter> api;
    if (!api->filter_items(p_data,temp))
        return false;
    return playlist_insert_items(p_playlist,p_base,temp,bit_array_val(p_select)) != pfc_infinite;
}

bool playlist_manager::activeplaylist_insert_items_filter(t_size p_base,const pfc::list_base_const_t<metadb_handle_ptr> & p_data,bool p_select)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_insert_items_filter(playlist,p_base,p_data,p_select);
    else return false;
}

bool playlist_manager::playlist_insert_locations(t_size p_playlist,t_size p_base,const pfc::list_base_const_t<const char*> & p_urls,bool p_select,HWND p_parentwnd)
{
    metadb_handle_list temp;
    static_api_ptr_t<playlist_incoming_item_filter> api;
    if (!api->process_locations(p_urls,temp,true,0,0,p_parentwnd)) return false;
    return playlist_insert_items(p_playlist,p_base,temp,bit_array_val(p_select)) != pfc_infinite;
}

bool playlist_manager::activeplaylist_insert_locations(t_size p_base,const pfc::list_base_const_t<const char*> & p_urls,bool p_select,HWND p_parentwnd)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_insert_locations(playlist,p_base,p_urls,p_select,p_parentwnd);
    else return false;
}

bool playlist_manager::playlist_add_items_filter(t_size p_playlist,const pfc::list_base_const_t<metadb_handle_ptr> & p_data,bool p_select)
{
    return playlist_insert_items_filter(p_playlist,pfc_infinite,p_data,p_select);
}

bool playlist_manager::activeplaylist_add_items_filter(const pfc::list_base_const_t<metadb_handle_ptr> & p_data,bool p_select)
{
    return activeplaylist_insert_items_filter(pfc_infinite,p_data,p_select);
}

bool playlist_manager::playlist_add_locations(t_size p_playlist,const pfc::list_base_const_t<const char*> & p_urls,bool p_select,HWND p_parentwnd)
{
    return playlist_insert_locations(p_playlist,pfc_infinite,p_urls,p_select,p_parentwnd);
}
bool playlist_manager::activeplaylist_add_locations(const pfc::list_base_const_t<const char*> & p_urls,bool p_select,HWND p_parentwnd)
{
    return activeplaylist_insert_locations(pfc_infinite,p_urls,p_select,p_parentwnd);
}

void playlist_manager::reset_playing_playlist()
{
    set_playing_playlist(get_active_playlist());
}

void playlist_manager::playlist_clear_selection(t_size p_playlist)
{
    playlist_set_selection(p_playlist,bit_array_true(),bit_array_false());
}

void playlist_manager::activeplaylist_clear_selection()
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_clear_selection(playlist);
}

void playlist_manager::activeplaylist_undo_backup()
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_undo_backup(playlist);
}

bool playlist_manager::activeplaylist_undo_restore()
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_undo_restore(playlist);
    else return false;
}

bool playlist_manager::activeplaylist_redo_restore()
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_redo_restore(playlist);
    else return false;
}

void playlist_manager::playlist_remove_selection(t_size p_playlist,bool p_crop)
{
    bit_array_bittable table(playlist_get_item_count(p_playlist));
    playlist_get_selection_mask(p_playlist,table);
    if (p_crop) playlist_remove_items(p_playlist,bit_array_not(table));
    else playlist_remove_items(p_playlist,table);
}

void playlist_manager::activeplaylist_remove_selection(bool p_crop)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_remove_selection(playlist,p_crop);
}

void playlist_manager::activeplaylist_item_format_title(t_size p_item,titleformat_hook * p_hook,pfc::string_base & out,const service_ptr_t<titleformat_object> & p_script,titleformat_text_filter * p_filter,play_control::t_display_level p_playback_info_level)
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) out = "NJET";
    else playlist_item_format_title(playlist,p_item,p_hook,out,p_script,p_filter,p_playback_info_level);
}

void playlist_manager::playlist_set_selection_single(t_size p_playlist,t_size p_item,bool p_state)
{
    playlist_set_selection(p_playlist,bit_array_one(p_item),bit_array_val(p_state));
}

void playlist_manager::activeplaylist_set_selection_single(t_size p_item,bool p_state)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_set_selection_single(playlist,p_item,p_state);
}

t_size playlist_manager::playlist_get_selection_count(t_size p_playlist,t_size p_max)
{
    enum_items_callback_count_selection callback(p_max);
    playlist_enum_items(p_playlist,callback,bit_array_true());
    return callback.get_count();
}

t_size playlist_manager::activeplaylist_get_selection_count(t_size p_max)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_get_selection_count(playlist,p_max);
    else return 0;
}

bool playlist_manager::playlist_get_focus_item_handle(metadb_handle_ptr & p_out,t_size p_playlist)
{
    t_size index = playlist_get_focus_item(p_playlist);
    if (index == pfc_infinite) return false;
    return playlist_get_item_handle(p_out,p_playlist,index);
}

bool playlist_manager::activeplaylist_get_focus_item_handle(metadb_handle_ptr & p_out)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_get_focus_item_handle(p_out,playlist);
    else return false;
}

t_size playlist_manager::find_playlist(const char * p_name,t_size p_name_length)
{
    t_size n, m = get_playlist_count();
    pfc::string_formatter temp;
    for(n=0;n<m;n++) {
        if (!playlist_get_name(n,temp)) break;
        if (stricmp_utf8_ex(temp,temp.length(),p_name,p_name_length) == 0) return n;
    }
    return pfc_infinite;
}

t_size playlist_manager::find_or_create_playlist_unlocked(const char * p_name, t_size p_name_length) {
    t_size n, m = get_playlist_count();
    pfc::string_formatter temp;
    for(n=0;n<m;n++) {
        if (!playlist_lock_is_present(n) && playlist_get_name(n,temp)) {
            if (stricmp_utf8_ex(temp,~0,p_name,p_name_length) == 0) return n;
        }
    }
    return create_playlist(p_name,p_name_length,pfc_infinite);
}
t_size playlist_manager::find_or_create_playlist(const char * p_name,t_size p_name_length)
{
    t_size index = find_playlist(p_name,p_name_length);
    if (index != pfc_infinite) return index;
    return create_playlist(p_name,p_name_length,pfc_infinite);
}

t_size playlist_manager::create_playlist_autoname(t_size p_index) { 
    static const char new_playlist_text[] = "New Playlist";
    if (find_playlist(new_playlist_text,pfc_infinite) == pfc_infinite) return create_playlist(new_playlist_text,pfc_infinite,p_index);
    for(t_size walk = 2; ; walk++) {
        pfc::string_fixed_t<64> namebuffer;
        namebuffer << new_playlist_text << " (" << walk << ")";
        if (find_playlist(namebuffer,pfc_infinite) == pfc_infinite) return create_playlist(namebuffer,pfc_infinite,p_index);
    }
}

bool playlist_manager::activeplaylist_sort_by_format(const char * spec,bool p_sel_only)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) return playlist_sort_by_format(playlist,spec,p_sel_only);
    else return false;
}

bool playlist_manager::highlight_playing_item()
{
    t_size playlist,item;
    if (!get_playing_item_location(&playlist,&item)) return false;
    set_active_playlist(playlist);
    playlist_set_focus_item(playlist,item);
    playlist_set_selection(playlist,bit_array_true(),bit_array_one(item));
    playlist_ensure_visible(playlist,item);
    return true;
}

void playlist_manager::playlist_get_items(t_size p_playlist,pfc::list_base_t<metadb_handle_ptr> & out,const bit_array & p_mask)
{
    playlist_enum_items(p_playlist,enum_items_callback_retrieve_all_items(out),p_mask);
}

void playlist_manager::activeplaylist_get_items(pfc::list_base_t<metadb_handle_ptr> & out,const bit_array & p_mask)
{
    t_size playlist = get_active_playlist();
    if (playlist != pfc_infinite) playlist_get_items(playlist,out,p_mask);
    else out.remove_all();
}

void playlist_manager::active_playlist_fix()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite)
    {
        t_size max = get_playlist_count();
        if (max == 0)
        {
            create_playlist_autoname();
        }
        set_active_playlist(0);
    }
}

namespace {
    class enum_items_callback_remove_list : public playlist_manager::enum_items_callback
    {
        const metadb_handle_list & m_data;
        bit_array_var & m_table;
        t_size m_found;
    public:
        enum_items_callback_remove_list(const metadb_handle_list & p_data,bit_array_var & p_table) : m_data(p_data), m_table(p_table), m_found(0) {}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected)
        {
            bool found = m_data.bsearch_by_pointer(p_location) != pfc_infinite;
            m_table.set(p_index,found);
            if (found) m_found++;
            return true;
        }
        
        inline t_size get_found() const {return m_found;}
    };
}

void playlist_manager::remove_items_from_all_playlists(const pfc::list_base_const_t<metadb_handle_ptr> & p_data)
{
    t_size playlist_num, playlist_max = get_playlist_count();
    if (playlist_max != pfc_infinite)
    {
        metadb_handle_list temp;
        temp.add_items(p_data);
        temp.sort_by_pointer();
        for(playlist_num = 0; playlist_num < playlist_max; playlist_num++ )
        {
            t_size playlist_item_count = playlist_get_item_count(playlist_num);
            if (playlist_item_count == pfc_infinite) break;
            bit_array_bittable table(playlist_item_count);
            enum_items_callback_remove_list callback(temp,table);
            playlist_enum_items(playlist_num,callback,bit_array_true());
            if (callback.get_found()>0)
                playlist_remove_items(playlist_num,table);
        }
    }
}

bool playlist_manager::get_all_items(pfc::list_base_t<metadb_handle_ptr> & out)
{
    t_size n, m = get_playlist_count();
    if (m == pfc_infinite) return false;
    enum_items_callback_retrieve_all_items callback(out);
    for(n=0;n<m;n++)
    {
        playlist_enum_items(n,callback,bit_array_true());
    }
    return true;
}

t_uint32 playlist_manager::activeplaylist_lock_get_filter_mask()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return ~0;
    else return playlist_lock_get_filter_mask(playlist);
}

bool playlist_manager::activeplaylist_is_undo_available()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return false;
    else return playlist_is_undo_available(playlist);
}

bool playlist_manager::activeplaylist_is_redo_available()
{
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return false;
    else return playlist_is_redo_available(playlist);
}

bool playlist_manager::remove_playlist_switch(t_size idx)
{
    bool need_switch = get_active_playlist() == idx;
    if (remove_playlist(idx))
    {
        if (need_switch)
        {
            t_size total = get_playlist_count();
            if (total > 0)
            {
                if (idx >= total) idx = total-1;
                set_active_playlist(idx);
            }
        }
        return true;
    }
    else return false;
}



bool t_playback_queue_item::operator==(const t_playback_queue_item & p_item) const
{
    return m_handle == p_item.m_handle && m_playlist == p_item.m_playlist && m_item == p_item.m_item;
}

bool t_playback_queue_item::operator!=(const t_playback_queue_item & p_item) const
{
    return m_handle != p_item.m_handle || m_playlist != p_item.m_playlist || m_item != p_item.m_item;
}



bool playlist_manager::activeplaylist_execute_default_action(t_size p_item) {
    t_size idx = get_active_playlist();
    if (idx == pfc_infinite) return false;
    else return playlist_execute_default_action(idx,p_item);
}

namespace {
    class completion_notify_dfd : public completion_notify {
    public:
        completion_notify_dfd(const pfc::list_base_const_t<metadb_handle_ptr> & p_data,service_ptr_t<process_locations_notify> p_notify) : m_data(p_data), m_notify(p_notify) {}
        void on_completion(unsigned p_code) {
            switch(p_code) {
            case metadb_io::load_info_aborted:
                m_notify->on_aborted();
                break;
            default:
                m_notify->on_completion(m_data);
                break;
            }
        }
    private:
        metadb_handle_list m_data;
        service_ptr_t<process_locations_notify> m_notify;
    };
};

void dropped_files_data_impl::to_handles_async_ex(t_uint32 p_op_flags,HWND p_parentwnd,service_ptr_t<process_locations_notify> p_notify) {
    if (m_is_paths) {
        static_api_ptr_t<playlist_incoming_item_filter_v2>()->process_locations_async(
            m_paths,
            p_op_flags,
            NULL,
            NULL,
            p_parentwnd,
            p_notify);
    } else {
        t_uint32 flags = 0;
        if (p_op_flags & playlist_incoming_item_filter_v2::op_flag_background) flags |= metadb_io_v2::op_flag_background;
        if (p_op_flags & playlist_incoming_item_filter_v2::op_flag_delay_ui) flags |= metadb_io_v2::op_flag_delay_ui;
        static_api_ptr_t<metadb_io_v2>()->load_info_async(m_handles,metadb_io::load_info_default,p_parentwnd,flags,new service_impl_t<completion_notify_dfd>(m_handles,p_notify));
    }
}
void dropped_files_data_impl::to_handles_async(bool p_filter,HWND p_parentwnd,service_ptr_t<process_locations_notify> p_notify) {
    to_handles_async_ex(p_filter ? 0 : playlist_incoming_item_filter_v2::op_flag_no_filter,p_parentwnd,p_notify);
}

bool dropped_files_data_impl::to_handles(pfc::list_base_t<metadb_handle_ptr> & p_out,bool p_filter,HWND p_parentwnd) {
    if (m_is_paths) {
        return static_api_ptr_t<playlist_incoming_item_filter>()->process_locations(m_paths,p_out,p_filter,NULL,NULL,p_parentwnd);
    } else {
        if (static_api_ptr_t<metadb_io>()->load_info_multi(m_handles,metadb_io::load_info_default,p_parentwnd,true) == metadb_io::load_info_aborted) return false;
        p_out = m_handles;
        return true;
    }
}

void playlist_manager::playlist_activate_delta(int p_delta) {
    const t_size total = get_playlist_count();
    if (total > 0) {
        t_size active = get_active_playlist();
        
        //clip p_delta to -(total-1)...(total-1) range
        if (p_delta < 0) {
            p_delta = - ( (-p_delta) % (t_ssize)total );
        } else {
            p_delta = p_delta % total;
        }
        if (p_delta != 0) {
            if (active == pfc_infinite) {
                //special case when no playlist is active
                if (p_delta > 0) {
                    active = (t_size)(p_delta - 1);
                } else {
                    active = (total + p_delta);//p_delta is negative
                }
            } else {
                active = (t_size) (active + total + p_delta) % total;
            }
            set_active_playlist(active % total);
        }
    }
}
namespace {
    class enum_items_callback_get_selected_count : public playlist_manager::enum_items_callback {
    public:
        enum_items_callback_get_selected_count() : m_found() {}
        t_size get_count() const {return m_found;}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected) {
            if (b_selected) m_found++;
            return true;
        }
    private:
        t_size m_found;
    };
}
t_size playlist_manager::playlist_get_selected_count(t_size p_playlist,bit_array const & p_mask) {
    enum_items_callback_get_selected_count callback;
    playlist_enum_items(p_playlist,callback,p_mask);
    return callback.get_count();
}

namespace {
    class enum_items_callback_find_item : public playlist_manager::enum_items_callback {
    public:
        enum_items_callback_find_item(metadb_handle_ptr p_lookingFor) : m_result(pfc_infinite), m_lookingFor(p_lookingFor) {}
        t_size result() const {return m_result;}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected) {
            if (p_location == m_lookingFor) {
                m_result = p_index;
                return false;
            } else {
                return true;
            }
        }
    private:
        metadb_handle_ptr m_lookingFor;
        t_size m_result;
    };
    class enum_items_callback_find_item_selected : public playlist_manager::enum_items_callback {
    public:
        enum_items_callback_find_item_selected(metadb_handle_ptr p_lookingFor) : m_result(pfc_infinite), m_lookingFor(p_lookingFor) {}
        t_size result() const {return m_result;}
        bool on_item(t_size p_index,const metadb_handle_ptr & p_location,bool b_selected) {
            if (b_selected && p_location == m_lookingFor) {
                m_result = p_index;
                return false;
            } else {
                return true;
            }
        }
    private:
        metadb_handle_ptr m_lookingFor;
        t_size m_result;
    };
}

bool playlist_manager::playlist_find_item(t_size p_playlist,metadb_handle_ptr p_item,t_size & p_result) {
    enum_items_callback_find_item callback(p_item);
    playlist_enum_items(p_playlist,callback,bit_array_true());
    t_size result = callback.result();
    if (result == pfc_infinite) return false;
    p_result = result;
    return true;
}
bool playlist_manager::playlist_find_item_selected(t_size p_playlist,metadb_handle_ptr p_item,t_size & p_result) {
    enum_items_callback_find_item_selected callback(p_item);
    playlist_enum_items(p_playlist,callback,bit_array_true());
    t_size result = callback.result();
    if (result == pfc_infinite) return false;
    p_result = result;
    return true;
}
t_size playlist_manager::playlist_set_focus_by_handle(t_size p_playlist,metadb_handle_ptr p_item) {
    t_size index;
    if (!playlist_find_item(p_playlist,p_item,index)) index = pfc_infinite;
    playlist_set_focus_item(p_playlist,index);
    return index;
}
bool playlist_manager::activeplaylist_find_item(metadb_handle_ptr p_item,t_size & p_result) {
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return false;
    return playlist_find_item(playlist,p_item,p_result);
}
t_size playlist_manager::activeplaylist_set_focus_by_handle(metadb_handle_ptr p_item) {
    t_size playlist = get_active_playlist();
    if (playlist == pfc_infinite) return pfc_infinite;
    return playlist_set_focus_by_handle(playlist,p_item);
}

pfc::com_ptr_t<interface IDataObject> playlist_incoming_item_filter::create_dataobject_ex(metadb_handle_list_cref data) {
    pfc::com_ptr_t<interface IDataObject> temp; temp.attach( create_dataobject(data) ); PFC_ASSERT( temp.is_valid() ); return temp;
}

void playlist_manager_v3::recycler_restore_by_id(t_uint32 id) {
    t_size which = recycler_find_by_id(id);
    if (which != ~0) recycler_restore(which);
}

t_size playlist_manager_v3::recycler_find_by_id(t_uint32 id) {
    const t_size total = recycler_get_count();
    for(t_size walk = 0; walk < total; ++walk) {
        if (id == recycler_get_id(walk)) return walk;
    }
    return ~0;
}