#pragma once

#include <cstdint>
#include <memory>
#include <string>

#include <mw/database.hpp>
#include <mw/error.hpp>

namespace telegrammer
{

/// Holds an advisory exclusive lock for one running Telegrammer daemon.
class DatabaseLock
{
public:
    /// Acquire the non-blocking lock associated with a database path.
    explicit DatabaseLock(const std::string& db_path);

    /// Release the lock when the daemon has stopped.
    ~DatabaseLock();

    DatabaseLock(const DatabaseLock&) = delete;
    DatabaseLock& operator=(const DatabaseLock&) = delete;

private:
    std::string lock_path_;
    int fd_ = -1;
};

/// Open a configured SQLite connection for one short operation.
mw::E<std::unique_ptr<mw::SQLite>> openDatabase(const std::string& db_path);

/// Create the development schema and reject incompatible old layouts.
mw::E<void> initializeDatabase(const std::string& db_path);

/// Return the current wall-clock time as Unix seconds.
int64_t nowSeconds();

} // namespace telegrammer