/*
 * filter_movit_resize.cpp
 * Copyright (C) 2013-2020 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 <math.h>
#include <stdlib.h>
#include <string.h>

#include "filter_glsl_manager.h"
#include "optional_effect.h"
#include <init.h>
#include <padding_effect.h>

using namespace movit;

static float alignment_parse(char *align)
{
    int ret = 0.0f;

    if (align == NULL)
        ;
    else if (isdigit(align[0]))
        ret = atoi(align);
    else if (align[0] == 'c' || align[0] == 'm')
        ret = 1.0f;
    else if (align[0] == 'r' || align[0] == 'b')
        ret = 2.0f;

    return ret;
}

static int get_image(mlt_frame frame,
                     uint8_t **image,
                     mlt_image_format *format,
                     int *width,
                     int *height,
                     int writable)
{
    int error = 0;
    mlt_properties properties = MLT_FRAME_PROPERTIES(frame);
    mlt_filter filter = (mlt_filter) mlt_frame_pop_service(frame);
    mlt_profile profile = mlt_service_profile(MLT_FILTER_SERVICE(filter));

    // Retrieve the aspect ratio
    double aspect_ratio = mlt_frame_get_aspect_ratio(frame);
    double consumer_aspect = mlt_profile_sar(profile);

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

    // Assign requested width/height from our subordinate
    int owidth = *width;
    int oheight = *height;

    // Use a mlt_rect to compute position and size
    mlt_rect rect;
    rect.x = rect.y = 0.0;
    rect.w = rect.h = 1.0;
    if (mlt_properties_get(properties, "resize.rect")) {
        mlt_position position = mlt_filter_get_position(filter, frame);
        mlt_position length = mlt_filter_get_length2(filter, frame);
        rect = mlt_properties_anim_get_rect(properties, "resize.rect", position, length);
        if (strchr(mlt_properties_get(properties, "resize.rect"), '%')) {
            rect.x *= profile->width;
            rect.w *= profile->width;
            rect.y *= profile->height;
            rect.h *= profile->height;
        }
        double scale = mlt_profile_scale_width(profile, *width);
        rect.x *= scale;
        rect.w *= scale;
        scale = mlt_profile_scale_height(profile, *height);
        rect.y *= scale;
        rect.h *= scale;
        if (!mlt_properties_get_int(properties, "resize.fill")) {
            int x = mlt_properties_get_int(properties, "meta.media.width");
            owidth = lrintf(rect.w > x ? x : rect.w);
            x = mlt_properties_get_int(properties, "meta.media.height");
            oheight = lrintf(rect.h > x ? x : rect.h);
        } else {
            owidth = lrintf(rect.w);
            oheight = lrintf(rect.h);
        }
    }

    // Check for the special case - no aspect ratio means no problem :-)
    if (aspect_ratio == 0.0)
        aspect_ratio = consumer_aspect;

    // Reset the aspect ratio
    mlt_properties_set_double(properties, "aspect_ratio", aspect_ratio);

    // Skip processing if requested.
    char *rescale = mlt_properties_get(properties, "consumer.rescale");
    if (*format == mlt_image_none || (rescale && !strcmp(rescale, "none")))
        return mlt_frame_get_image(frame, image, format, width, height, writable);

    if (mlt_properties_get_int(properties, "distort") == 0) {
        // Normalize the input and out display aspect
        int normalized_width = profile->width;
        int normalized_height = profile->height;
        int real_width = mlt_properties_get_int(properties, "meta.media.width");
        int real_height = mlt_properties_get_int(properties, "meta.media.height");
        if (real_width == 0)
            real_width = mlt_properties_get_int(properties, "width");
        if (real_height == 0)
            real_height = mlt_properties_get_int(properties, "height");
        double input_ar = aspect_ratio * real_width / real_height;
        double output_ar = consumer_aspect * owidth / oheight;

        // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
        int scaled_width = lrint((input_ar * normalized_width) / output_ar);
        int scaled_height = normalized_height;

        // Now ensure that our images fit in the output frame
        if (scaled_width > normalized_width) {
            scaled_width = normalized_width;
            scaled_height = lrint((output_ar * normalized_height) / input_ar);
        }

        // Now calculate the actual image size that we want
        owidth = lrint(scaled_width * owidth / normalized_width);
        oheight = lrint(scaled_height * oheight / normalized_height);

        mlt_log_debug(MLT_FILTER_SERVICE(filter),
                      "real %dx%d normalized %dx%d output %dx%d sar %f in-dar %f out-dar %f\n",
                      real_width,
                      real_height,
                      normalized_width,
                      normalized_height,
                      owidth,
                      oheight,
                      aspect_ratio,
                      input_ar,
                      output_ar);

        // Tell frame we have conformed the aspect to the consumer
        mlt_frame_set_aspect_ratio(frame, consumer_aspect);
    }

    mlt_properties_set_int(properties, "distort", 0);

    // Now get the image
    *format = mlt_image_movit;
    error = mlt_frame_get_image(frame, image, format, &owidth, &oheight, writable);

    // Offset the position according to alignment
    if (mlt_properties_get(properties, "resize.rect")) {
        // default top left if rect supplied
        float w = float(rect.w - owidth);
        float h = float(rect.h - oheight);
        rect.x += w * alignment_parse(mlt_properties_get(properties, "resize.halign")) / 2.0f;
        rect.y += h * alignment_parse(mlt_properties_get(properties, "resize.valign")) / 2.0f;
    } else {
        // default center if no rect
        float w = float(*width - owidth);
        float h = float(*height - oheight);
        rect.x = w * 0.5f;
        rect.y = h * 0.5f;
    }

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

    if (!error) {
        mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter);
        GlslManager::get_instance()->lock_service(frame);
        mlt_properties_set_int(filter_properties, "_movit.parms.int.width", *width);
        mlt_properties_set_int(filter_properties, "_movit.parms.int.height", *height);
        mlt_properties_set_double(filter_properties, "_movit.parms.float.left", rect.x);
        mlt_properties_set_double(filter_properties, "_movit.parms.float.top", rect.y);

        bool disable = (*width == owidth && *height == oheight && rect.x == 0 && rect.y == 0);
        mlt_properties_set_int(filter_properties, "_movit.parms.int.disable", disable);

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

        GlslManager::set_effect_input(MLT_FILTER_SERVICE(filter), frame, (mlt_service) *image);
        GlslManager::set_effect(MLT_FILTER_SERVICE(filter),
                                frame,
                                new OptionalEffect<PaddingEffect>);
        *image = (uint8_t *) MLT_FILTER_SERVICE(filter);
        return error;
    }

    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_resize_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;
}
