#pragma once

#include <vector>
#include <memory>
#include <mutex>
#include <string>
#include <ostream>
#include <atomic>
#include <condition_variable>

#include "compdb.h"

class DepNode {
public:
	virtual ~DepNode() = default;

	const std::vector<std::shared_ptr<DepNode>> &children() { return deps_; }
	void addChild(std::shared_ptr<DepNode> node);
	bool hasChanged(const std::string &outDir);
	void startBuild(const std::string &outDir);
	void joinBuild();
	void writeCompDB(const std::string &outDir, compdb::Writer &w);
	virtual std::vector<std::string> publicLDFlags(const std::string &outDir);
	virtual std::vector<std::string> publicLDLibs(const std::string &outDir);
	virtual std::vector<std::string> publicObjects(const std::string &outDir);

protected:
	enum class TriState {
		UNKNOWN, FALSE, TRUE,
	};

	virtual bool checkHasChanged(const std::string &outDir) = 0;
	virtual void doBuild(const std::string &outDir) = 0;
	virtual void doWriteCompDB(const std::string &outDir, compdb::Writer &w) {}
	virtual std::vector<std::string> getPublicLDFlags(const std::string &outDir) { return {}; }
	virtual std::vector<std::string> getPublicLDLibs(const std::string &outDir) { return {}; }
	virtual std::vector<std::string> getPublicObjects(const std::string &outDir) { return {}; }

	TriState has_changed_ = TriState::UNKNOWN;
	bool build_complete_ = false;
	bool build_started_ = false;
	std::mutex mut_;
	std::condition_variable build_cond_;
	std::vector<std::shared_ptr<DepNode>> deps_;
};