#pragma once

#include "core/effect.hpp"

namespace effector {

// Converts its input to black and white, with the choice of channel weighting
// a photographer would make behind the lens (a red filter darkening a sky, for
// instance), an optional contrast pull and an optional toner. Like the blur it
// needs no source images of its own, so it can lead a chain; given sources it
// fills the canvas from one of them first.
class MonochromeEffect : public Effect {
   public:
    std::string name() const override { return "monochrome"; }
    std::string title() const override { return "Black and white"; }
    std::string description() const override {
        return "Converts its input to black and white with a choice of channel weighting, an "
               "optional contrast pull and an optional toner; with sources loaded it fills the "
               "canvas from a randomly chosen one first.";
    }
    const std::vector<ParamSpec>& params() const override;
    bool needsSources() const override { return false; }

    Image render(const std::vector<Image>& sources, int width, int height, Rng& rng,
                 const ParamValues& values) const override;
};

}  // namespace effector