#pragma once

#include <cstdint>
#include <optional>
#include <string>
#include <vector>

#include "core/canvas.hpp"
#include "core/chain.hpp"
#include "core/params.hpp"
#include "core/style.hpp"
#include "core/video.hpp"

namespace effector {

// Everything needed to recreate a render: which images went in, the cascade
// with its settings, the canvas and the seed. Deliberately no pixels — a
// project is a small text file that points at the sources on disk.
struct Project {
    std::vector<std::string> sources;  // absolute paths
    std::vector<ChainStage> stages;
    // The named looks the stages draw their formatting from. Kept beside the
    // chain rather than inside it because that is the whole point of a style:
    // several stages share one, and editing it moves all of them at once.
    StyleSet styles;
    int width = 1920;
    int height = 1080;
    // The named format the canvas came from, empty for a custom pixel size.
    // The pixels above stay the truth for the render; this is what the
    // interface puts back in its dropdown, and what a print format needs its
    // resolution for.
    std::string format;
    int dpi = kDefaultDpi;
    // Whether the project is a video, and how long and how fast.
    VideoSettings video;
    std::optional<std::uint64_t> seed;
};

// JSON, written for humans: two-space indent, one source path per line, and
// the params of a stage spelled with the same keys the effect declares.
// Source paths are written relative to `directory` when they live under it, so
// a project folder can be moved or shared whole.
std::string projectToJson(const Project& project, const std::string& directory = {});

// Throws EffectError on malformed JSON, an unknown effect or a missing chain.
// Relative source paths are resolved against `directory`; params the effect
// does not declare are dropped, and missing ones keep the effect's default. A
// style of an unknown kind, or a stage naming a style the file does not hold,
// is dropped the same way: the stage keeps its own values and still renders.
Project projectFromJson(const std::string& text, const std::string& directory = {});

// Both throw EffectError: the file is the user's, so failures are reported
// rather than silently swallowed.
void saveProject(const std::string& path, const Project& project);
Project loadProject(const std::string& path);

// The name to offer for the next export after `previous`: its stem with the
// trailing `-N` counted on (`city.png` → `city-1.png`, `city-4.png` →
// `city-5.png`), skipping any that already exist in its folder.
std::string nextExportPath(const std::string& previous);

}  // namespace effector