#pragma once

#include <string>
#include <vector>

#include "core/effect.hpp"
#include "core/image.hpp"
#include "core/params.hpp"
#include "core/rng.hpp"

namespace effector {

// One link of a cascade: an effect together with the values it runs with.
struct ChainStage {
    EffectPtr effect;
    ParamValues values;  // missing keys fall back to the effect's defaults
};

// Renders the stages in order. The first one sees the loaded sources; every
// later one sees the previous stage's output as its only source, so blur after
// scanlines softens the scanlines rather than the photographs.
//
// All stages share one Rng and run strictly in sequence, so a seed still
// reproduces the cascade byte for byte.
Image renderChain(const std::vector<ChainStage>& stages, const std::vector<Image>& sources,
                  int width, int height, Rng& rng);

// "Scanlines → Blur", for window titles and status lines.
std::string chainTitle(const std::vector<ChainStage>& stages);

// "scanlines-blur", for file names.
std::string chainSlug(const std::vector<ChainStage>& stages);

}  // namespace effector