#pragma once

#include <optional>
#include <string>
#include <string_view>
#include <vector>

namespace izo {

class CommandLine {
public:
    CommandLine(int argc, const char* const argv[]);
    CommandLine(int argc, char* argv[]);

    // Has reports whether an option was supplied, including --name=value.
    bool Has(std::string_view name) const noexcept;

    // Get returns the last value supplied as --name value or --name=value.
    // A flag without a value and a missing option both return std::nullopt.
    std::optional<std::string> Get(std::string_view name) const;
    std::string Get(std::string_view name, std::string_view fallback) const;
    int GetInt(std::string_view name, int fallback) const;

    // Arguments not consumed as option values. argv[0] is never included.
    const std::vector<std::string>& Positionals() const noexcept { return positionals_; }

private:
    struct Option {
        std::string name;
        std::optional<std::string> value;
    };

    void Parse(int argc, const char* const argv[]);

    std::vector<Option> options_;
    std::vector<std::string> positionals_;
};

} // namespace izo