// This file is part of Desktop App Toolkit,
// a set of libraries for developing nice desktop applications.
//
// For license and copyright information please follow this link:
// https://github.com/desktop-app/legal/blob/master/LEGAL
//
#pragma once

#include "lottie/lottie_common.h"
#include "base/weak_ptr.h"

#include <QtGui/QImage>
#include <variant>

class QString;
class QByteArray;

namespace rlottie {
class Animation;
} // namespace rlottie

namespace Lottie {

class Player;
class SharedState;
class FrameRenderer;
class FrameProvider;

std::shared_ptr<FrameRenderer> MakeFrameRenderer();

QImage ReadThumbnail(const QByteArray &content);

namespace details {

using InitData = std::variant<std::unique_ptr<SharedState>, Error>;

} // namespace details

class Animation final : public base::has_weak_ptr {
public:
	struct FrameInfo {
		QImage image;
		int index = 0;
	};

	Animation(
		not_null<Player*> player,
		const QByteArray &content,
		const FrameRequest &request,
		Quality quality,
		const ColorReplacements *replacements = nullptr);
	Animation(
		not_null<Player*> player,
		FnMut<void(FnMut<void(QByteArray &&cached)>)> get, // Main thread.
		FnMut<void(QByteArray &&cached)> put, // Unknown thread.
		const QByteArray &content,
		const FrameRequest &request,
		Quality quality,
		const ColorReplacements *replacements = nullptr);
	Animation( // Multi-cache version.
		not_null<Player*> player,
		int keysCount,
		FnMut<void(int, FnMut<void(QByteArray &&)>)> get,
		FnMut<void(int, QByteArray &&)> put, // Unknown thread.
		const QByteArray &content,
		const FrameRequest &request,
		Quality quality,
		const ColorReplacements *replacements = nullptr);
	Animation( // Thread-safe version.
		not_null<Player*> player,
		std::shared_ptr<FrameProvider> provider,
		const FrameRequest &request);

	[[nodiscard]] bool ready() const;
	[[nodiscard]] QImage frame() const;
	[[nodiscard]] QImage frame(const FrameRequest &request) const;
	[[nodiscard]] FrameInfo frameInfo(const FrameRequest &request) const;
	[[nodiscard]] int frameIndex() const;
	[[nodiscard]] int framesCount() const;
	[[nodiscard]] Information information() const;

private:
	void initDone(details::InitData &&data);
	void parseDone(std::unique_ptr<SharedState> state);
	void parseFailed(Error error);

	const not_null<Player*> _player;
	SharedState *_state = nullptr;

};

[[nodiscard]] std::optional<Error> ContentError(const QByteArray &content);

} // namespace Lottie