#pragma once
#include <sys/types.h>

#include <filesystem>
#include <optional>
#include <string>
#include <vector>

#include "network.hpp"

namespace doos {

class Container {
public:
    Container(std::filesystem::path dir, std::string name) : dir_(std::move(dir)), name_(std::move(name)) {}

    static void validateName(const std::string& name);

    const std::string& name() const { return name_; }
    const std::filesystem::path& dir() const { return dir_; }
    std::filesystem::path rootfs() const { return dir_ / "rootfs"; }
    std::filesystem::path layer(const std::string& hostDir) const;  // layers/<name>/{upper,work}
    std::filesystem::path privateDir(const std::string& hostDir) const;
    std::filesystem::path lockFile() const { return dir_ / "lock"; }
    std::filesystem::path pidFile() const { return dir_ / "pid"; }
    std::filesystem::path metaFile() const { return dir_ / "meta"; }

    NetMode net() const { return net_; }
    long created() const { return created_; }

    void create(NetMode net);  // writes layout and meta
    void load();               // reads meta

    // Process id (outside view) of the container's init, if it is alive.
    std::optional<pid_t> runningPid() const;
    void recordPid(pid_t pid) const;
    void clearPid() const;

    // Creates the (empty) mountpoint skeleton and layer dirs. Idempotent.
    void prepareLayout() const;

private:
    std::filesystem::path dir_;
    std::string name_;
    NetMode net_ = NetMode::Slirp;
    long created_ = 0;
};

class Store {
public:
    explicit Store(std::filesystem::path root);
    static Store fromEnvironment();

    std::vector<Container> list() const;
    // Returns the container and whether it was created by this call.
    std::pair<Container, bool> getOrCreate(const std::string& name, std::optional<NetMode> net);
    // Dry-run unless confirmed. Returns a human-readable report line.
    std::string remove(const std::string& name, bool confirmed);

    const std::filesystem::path& root() const { return root_; }

private:
    std::filesystem::path containersDir() const { return root_ / "containers"; }
    std::filesystem::path root_;
};

}  // namespace doos