// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "AES tools" project.
// For details, see https://github.com/egor-tensin/aes-tools.
// Distributed under the MIT License.

#pragma once

#include "block_input.hpp"
#include "data_parsers.hpp"
#include "helpers/command_line.hpp"

#include <aesxx/all.hpp>

#include <boost/program_options.hpp>

#include <deque>
#include <iterator>
#include <string>
#include <utility>
#include <vector>

class BlockSettings : public command_line::SettingsParser
{
public:
    aes::Algorithm algorithm = AES_AES128;
    aes::Mode mode = AES_ECB;

    bool use_boxes = false;
    bool verbose = false;

    std::vector<Input> inputs;

    explicit BlockSettings(const std::string& argv0)
        : SettingsParser{argv0}
    {
        visible.add_options()
            ("verbose,v",
                boost::program_options::bool_switch(&verbose),
                "enable verbose output")
            ("algorithm,a",
                boost::program_options::value<aes::Algorithm>(&algorithm)
                    ->required()
                    ->value_name("NAME"),
                "set algorithm")
            ("mode,m",
                boost::program_options::value<aes::Mode>(&mode)
                    ->required()
                    ->value_name("MODE"),
                "set mode of operation")
            ("use-boxes,b",
                boost::program_options::bool_switch(&use_boxes),
                "use the \"boxes\" interface");
        hidden.add_options()
            ("args",
                boost::program_options::value<std::vector<std::string>>(&args),
                "shouldn't be visible");
        positional.add("args", -1);
    }

    const char* get_short_description() const override
    {
        return "[-h|--help] [-v|--verbose] [-a|--algorithm NAME] [-m|--mode MODE]"
               " [-- KEY [IV] [BLOCK]...]...";
    }

    void parse(int argc, char* argv[]) override
    {
        SettingsParser::parse(argc, argv);
        parse_inputs(std::deque<std::string>{
            std::make_move_iterator(args.begin()),
            std::make_move_iterator(args.end())});
    }

private:
    void parse_inputs(std::deque<std::string>&& src)
    {
        while (!src.empty())
            inputs.emplace_back(parse_input(src));
    }

    Input parse_input(std::deque<std::string>& src) const
    {
        std::string key{std::move(src.front())};
        src.pop_front();

        std::string iv;

        if (aes::mode_requires_init_vector(mode))
        {
            if (src.empty())
            {
                throw boost::program_options::error{
                    "an initialization vector is required for the selected mode of operation"};
            }
            iv = std::move(src.front());
            src.pop_front();
        }

        auto blocks = parse_blocks(src);

        if (aes::mode_requires_init_vector(mode))
            return {key, iv, std::move(blocks)};
        else
            return {key, std::move(blocks)};
    }

    static std::vector<std::string> parse_blocks(std::deque<std::string>& src)
    {
        std::vector<std::string> blocks;

        while (!src.empty())
        {
            std::string block{std::move(src.front())};
            src.pop_front();
            if (block == "--")
                break;
            blocks.emplace_back(std::move(block));
        }

        return blocks;
    }

    std::vector<std::string> args;
};