/*
 * filter_movit_resample.cpp
 * Copyright (C) 2013 Dan Dennedy <dan@dennedy.org>
 *
 * 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.
 *
 * You should have received a copy of the GNU 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.
 */

#include <assert.h>
#include <framework/mlt.h>
#include <string.h>

#include "filter_glsl_manager.h"
#include "optional_effect.h"
#include <resample_effect.h>

using namespace movit;

static int get_image(mlt_frame frame,
                     uint8_t **image,
                     mlt_image_format *format,
                     int *width,
                     int *height,
                     int writable)
{
    mlt_properties properties = MLT_FRAME_PROPERTIES(frame);
    mlt_filter filter = (mlt_filter) mlt_frame_pop_service(frame);
    mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter);
    mlt_profile profile = mlt_service_profile(MLT_FILTER_SERVICE(filter));

    // Correct width/height if necessary
    if (*width < 0 || *height < 1) {
        *width = profile->width;
        *height = profile->height;
    }

    int iwidth = *width;
    int iheight = *height;
    double factor = mlt_properties_get_double(filter_properties, "factor");
    factor = factor > 0 ? factor : 1.0;
    int owidth = *width * factor;
    int oheight = *height * factor;

    // If meta.media.width/height exist, we want that as minimum information
    if (mlt_properties_get_int(properties, "meta.media.width")) {
        iwidth = mlt_properties_get_int(properties, "meta.media.width");
        iheight = mlt_properties_get_int(properties, "meta.media.height");
    }

    mlt_properties_set_int(properties, "rescale_width", *width);
    mlt_properties_set_int(properties, "rescale_height", *height);

    // Deinterlace if height is changing to prevent fields mixing on interpolation
    if (iheight != oheight)
        mlt_properties_set_int(properties, "consumer.progressive", 1);

    GlslManager::get_instance()->lock_service(frame);
    mlt_properties_set_int(filter_properties, "_movit.parms.int.width", owidth);
    mlt_properties_set_int(filter_properties, "_movit.parms.int.height", oheight);

    bool disable = (iwidth == owidth && iheight == oheight);
    mlt_properties_set_int(filter_properties, "_movit.parms.int.disable", disable);

    *width = owidth;
    *height = oheight;

    GlslManager::get_instance()->unlock_service(frame);

    // Get the image as requested
    if (*format != mlt_image_none)
        *format = mlt_image_movit;
    int error = mlt_frame_get_image(frame, image, format, &iwidth, &iheight, writable);

    if (*width < 1 || *height < 1 || iwidth < 1 || iheight < 1 || owidth < 1 || oheight < 1) {
        mlt_log_error(MLT_FILTER_SERVICE(filter),
                      "Invalid size for get_image: %dx%d, in: %dx%d, out: %dx%d",
                      *width,
                      *height,
                      iwidth,
                      iheight,
                      owidth,
                      oheight);
        return error;
    }

    GlslManager::set_effect_input(MLT_FILTER_SERVICE(filter), frame, (mlt_service) *image);
    Effect *effect = GlslManager::set_effect(MLT_FILTER_SERVICE(filter),
                                             frame,
                                             new OptionalEffect<ResampleEffect>);
    // This needs to be something else than 0x0 at chain finalization time.
    bool ok = effect->set_int("width", owidth);
    ok |= effect->set_int("height", oheight);
    assert(ok);
    *image = (uint8_t *) MLT_FILTER_SERVICE(filter);
    return error;
}

static mlt_frame process(mlt_filter filter, mlt_frame frame)
{
    mlt_frame_push_service(frame, filter);
    mlt_frame_push_get_image(frame, get_image);
    return frame;
}

extern "C" mlt_filter filter_movit_resample_init(mlt_profile profile,
                                                 mlt_service_type type,
                                                 const char *id,
                                                 char *arg)
{
    mlt_filter filter = NULL;
    GlslManager *glsl = GlslManager::get_instance();

    if (glsl && (filter = mlt_filter_new())) {
        mlt_properties properties = MLT_FILTER_PROPERTIES(filter);
        glsl->add_ref(properties);
        filter->process = process;
    }
    return filter;
}
