/*
 * filter_white_balance.cpp
 * Copyright (C) 2013-2026 Meltytech, LLC
 *
 * 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 <string.h>

#include "filter_glsl_manager.h"
#include <white_balance_effect.h>

using namespace movit;

static double srgb8_to_linear(int c)
{
    double x = c / 255.0f;
    if (x < 0.04045f) {
        return (1.0 / 12.92f) * x;
    } else {
        return pow((x + 0.055) * (1.0 / 1.055f), 2.4);
    }
}

static int get_image(mlt_frame frame,
                     uint8_t **image,
                     mlt_image_format *format,
                     int *width,
                     int *height,
                     int writable)
{
    mlt_filter filter = (mlt_filter) mlt_frame_pop_service(frame);

    mlt_properties properties = MLT_FILTER_PROPERTIES(filter);
    GlslManager::get_instance()->lock_service(frame);
    mlt_position position = mlt_filter_get_position(filter, frame);
    mlt_position length = mlt_filter_get_length2(filter, frame);
    int color_int = mlt_properties_anim_get_int(properties, "neutral_color", position, length);
    RGBTriplet color(srgb8_to_linear((color_int >> 24) & 0xff),
                     srgb8_to_linear((color_int >> 16) & 0xff),
                     srgb8_to_linear((color_int >> 8) & 0xff));
    mlt_properties_set_double(properties, "_movit.parms.vec3.neutral_color[0]", color.r);
    mlt_properties_set_double(properties, "_movit.parms.vec3.neutral_color[1]", color.g);
    mlt_properties_set_double(properties, "_movit.parms.vec3.neutral_color[2]", color.b);
    double output_color_temperature
        = mlt_properties_anim_get_double(properties, "color_temperature", position, length);
    mlt_properties_set_double(properties,
                              "_movit.parms.float.output_color_temperature",
                              output_color_temperature);
    GlslManager::get_instance()->unlock_service(frame);
    *format = mlt_image_movit;
    int error = mlt_frame_get_image(frame, image, format, width, height, writable);

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

    GlslManager::set_effect_input(MLT_FILTER_SERVICE(filter), frame, (mlt_service) *image);
    GlslManager::set_effect(MLT_FILTER_SERVICE(filter), frame, new WhiteBalanceEffect);
    *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_white_balance_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);
        mlt_properties_set(properties, "neutral_color", arg ? arg : "#7f7f7f");
        mlt_properties_set_double(properties, "color_temperature", 6500.0);
        filter->process = process;
    }
    return filter;
}
}
