#pragma once

#include "effects/video_effect.hpp"

namespace effector {

// The tiles effect in motion: the canvas is laid with tiles cut from the
// source images, and each tile is swapped for another cut, at a moment of its
// own, so the mosaic keeps changing piece by piece.
//
// The video effect built from the sources rather than transforming its input:
// it answers needsSources() and writes compose(). The layout is drawn from
// at.steady() and stays put; what a tile shows depends only on the tile and
// how many times it has swapped, so it holds still between its swaps.
class TileSwapEffect : public VideoEffect {
public:
    std::string name() const override { return "tileswap"; }
    std::string title() const override { return "Tile swap"; }
    std::string description() const override {
        return "Lays tiles cut from the source images over the canvas, as Tiles does, and swaps "
               "each one for another cut at a moment of its own.";
    }
    const std::vector<ParamSpec>& params() const override;
    bool needsSources() const override { return true; }

protected:
    Image compose(const std::vector<Image>& sources, int width, int height,
                  const ParamValues& values, const Moment& at) const override;
};

}  // namespace effector