/*****************************************************************************
 * VLCKit: VLCExtensionsManager
 *****************************************************************************
 * Copyright (C) 2010-2012 Pierre d'Herbemont and VideoLAN
 *
 * Authors: Pierre d'Herbemont
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#import "VLCExtensionsManager.h"
#import "VLCExtension.h"
#import "VLCLibrary.h"
#import "VLCLibVLCBridging.h"
#import <vlc_extensions.h>
#import <vlc_input.h>
#include <vlc_modules.h>

// Here comes the nasty hack.
#define MODULE_STRING "VLCKit"
#import "../vlc-unstable/lib/media_player_internal.h"
#import "../vlc-unstable/lib/libvlc_internal.h"

static input_thread_t *libvlc_media_player_get_input_thread(libvlc_media_player_t *player)
{
    vlc_mutex_lock(&player->input.lock);
    input_thread_t *input = player->input.p_thread;
    if(input)
        vlc_object_hold(input);
    vlc_mutex_unlock(&player->input.lock);
    return input;
}

static vlc_object_t *libvlc_get_vlc_instance(libvlc_instance_t *instance)
{
    vlc_mutex_lock(&instance->instance_lock);
    libvlc_int_t *libvlc = instance->p_libvlc_int;
    if(libvlc)
        vlc_object_hold(libvlc);
    vlc_mutex_unlock(&instance->instance_lock);
    return VLC_OBJECT(libvlc);
}


#define _instance ((extensions_manager_t *)instance)


@implementation VLCExtensionsManager

+ (VLCExtensionsManager *)sharedManager
{
    static VLCExtensionsManager *sharedManager;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedManager = [[self alloc] init];
    });
    return sharedManager;
}

- (void)dealloc
{
    module_unneed(_instance, _instance->p_module);
    vlc_object_release(_instance);

    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (NSArray *)extensions
{
    if (!instance)
    {
        vlc_object_t *libvlc = libvlc_get_vlc_instance([VLCLibrary sharedInstance]);
        instance = vlc_object_create(libvlc, sizeof(extensions_manager_t));
        if (!_instance)
        {
            vlc_object_release(libvlc);
            return nil;
        }

        _instance->p_module = module_need(_instance, "extension", NULL, false);
        NSAssert(_instance->p_module, @"Unable to load extensions module");

        vlc_object_release(libvlc);
    }

    if (_extensions)
        return _extensions;
    _extensions = [[NSMutableArray alloc] init];
    extension_t *ext;
    vlc_mutex_lock(&_instance->lock);
    FOREACH_ARRAY(ext, _instance->extensions)
        [_extensions addObject:[[VLCExtension alloc] initWithInstance:ext]];
    FOREACH_END()
    vlc_mutex_unlock(&_instance->lock);
    return _extensions;
}

- (void)runExtension:(VLCExtension *)extension
{
    extension_t *ext = [extension instance];

    if(extension_TriggerOnly(_instance, ext))
        extension_Trigger(_instance, ext);
    else
    {
        if(!extension_IsActivated(_instance, ext))
            extension_Activate(_instance, ext);
    }
}

- (void)mediaPlayerLikelyChangedInput
{
    input_thread_t *input = _player ? libvlc_media_player_get_input_thread([_player libVLCMediaPlayer]) : NULL;

    // Don't send more than appropriate
    if (_previousInput == input)
        return;
    _previousInput = input;

    for(VLCExtension *extension in _extensions)
        extension_SetInput(_instance, [extension instance], input);
    if (input)
        vlc_object_release(input);
}

- (void)setMediaPlayer:(VLCMediaPlayer *)player
{
    if (_player == player)
        return;

    // Don't set a NULL mediaPlayer.
    // so that we always have an input around.
    if (!player)
        return;

    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
    [center removeObserver:self name:VLCMediaPlayerStateChanged object:_player];

    _player = player;

    [self mediaPlayerLikelyChangedInput];


    if (player)
        [center addObserver:self selector:@selector(mediaPlayerLikelyChangedInput) name:VLCMediaPlayerStateChanged object:_player];
}

- (VLCMediaPlayer *)mediaPlayer
{
    return _player;
}
@end