config.h

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/*
Copyright (c) 2026 MrXie1109
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
 
#pragma once
#include <map>
 
#include "../container/maybe.h"
#include "../io/file.h"
#include "strpp.h"
 
namespace console {
    template <class CharT = char>
    class BasicINIConfig {
        using string_type = std::basic_string<CharT>;
 
        std::map<string_type, std::map<string_type, string_type>> data_;
 
    public:
        BasicINIConfig() = default;

        BasicINIConfig(const std::string &filename) { load(Path(filename)); }

        BasicINIConfig(const Path &filename) { load(filename); }

        void load(const Path &filename) {
            std::fstream fs = filename.stream();
            fs >> *this;
        }

        void save(const std::string &filename) { save(Path(filename)); }

        void save(const Path &filename) const {
            std::ofstream fout(filename.str(), std::ios::trunc);
            if (!fout.is_open())
                throw FileError("Cannot Open File \"" + filename.str() + '"');
            // 用 narrow 流输出，通过窄字符串中转
            std::ostringstream oss;
            write_to_stream(oss);
            fout << oss.str();
            if (!fout.good())
                throw FileError(
                    "The Stream of \"" + filename.str() + "\" is Not Good");
        }
 
    private:
        void write_to_stream(std::ostream &os) const {
            for (const auto &p : data_) {
                if (!p.first.empty())
                    os << '[' << to_narrow(p.first) << ']' << '\n';
                for (const auto &kv : p.second)
                    os << to_narrow(kv.first) << " = " << to_narrow(kv.second)
                       << '\n';
                os << '\n';
            }
        }
 
        static std::string to_narrow(const string_type &s) {
            return std::string(s.begin(), s.end());
        }
 
        void read_from_stream(std::istream &is) {
            std::string line;
            string_type current_section;
            while (std::getline(is, line)) {
                string_type trimmed_line
                    = trim(string_type(line.begin(), line.end()));
                if (trimmed_line.empty() || trimmed_line[0] == CharT(';')
                    || trimmed_line[0] == CharT('#'))
                    continue;
                if (trimmed_line.front() == CharT('[')
                    && trimmed_line.back() == CharT(']'))
                    current_section
                        = trim(trimmed_line.substr(1, trimmed_line.size() - 2));
                else {
                    auto pos = trimmed_line.find(CharT('='));
                    if (pos != string_type::npos) {
                        string_type key   = trim(trimmed_line.substr(0, pos));
                        string_type value = trim(trimmed_line.substr(pos + 1));
                        data_[current_section][key] = value;
                    }
                }
            }
        }
 
    public:
        friend std::basic_ostream<CharT> &operator<<(
            std::basic_ostream<CharT> &os, const BasicINIConfig &config) {
            for (const auto &p : config.data_) {
                if (!p.first.empty())
                    os << CharT('[') << p.first << CharT(']') << CharT('\n');
                for (const auto &kv : p.second)
                    os << kv.first << " = " << kv.second << CharT('\n');
                os << CharT('\n');
            }
            return os;
        }

        friend std::basic_istream<CharT> &
        operator>>(std::basic_istream<CharT> &is, BasicINIConfig &config) {
            string_type line;
            string_type current_section;
            while (std::getline(is, line)) {
                string_type trimmed_line = trim(line);
                if (trimmed_line.empty() || trimmed_line[0] == CharT(';')
                    || trimmed_line[0] == CharT('#'))
                    continue;
                if (trimmed_line.front() == CharT('[')
                    && trimmed_line.back() == CharT(']'))
                    current_section
                        = trim(trimmed_line.substr(1, trimmed_line.size() - 2));
                else {
                    auto pos = trimmed_line.find(CharT('='));
                    if (pos != string_type::npos) {
                        string_type key   = trim(trimmed_line.substr(0, pos));
                        string_type value = trim(trimmed_line.substr(pos + 1));
                        config.data_[current_section][key] = value;
                    }
                }
            }
            return is;
        }

        class Item {
            string_type str_;
 
        public:
            Item(const string_type &s) : str_(s) {}
 
            operator string_type() const { return str_; }
 
            operator bool() const {
                string_type lower = str_;
                for (auto &c : lower) c = std::tolower(c, std::locale{});
                if (lower
                    == string_type{//
                        CharT('t'),
                        CharT('r'),
                        CharT('u'),
                        CharT('e')}
                    || lower == string_type{CharT('1')}
                    || lower == string_type{CharT('y'), CharT('e'), CharT('s')}
                    || lower == string_type{CharT('o'), CharT('n')})
                    return true;
                if (lower
                    == string_type{//
                        CharT('f'),
                        CharT('a'),
                        CharT('l'),
                        CharT('s'),
                        CharT('e')}
                    || lower == string_type{CharT('0')}
                    || lower == string_type{CharT('n'), CharT('o')}
                    || lower == string_type{CharT('o'), CharT('f'), CharT('f')})
                    return false;
                throw TypeError(
                    "Failed to Convert \"" + to_narrow(str_) + "\" to bool");
            }
 
            template <class T>
            operator T() const {
                std::basic_istringstream<CharT> iss(str_);
                T                               value;
                iss >> value;
                if (iss.fail())
                    throw TypeError("Failed to Convert \"" + to_narrow(str_)
                                    + "\" to Target Type");
                return value;
            }
        };

        Item get(const string_type &section_and_key) const {
            auto pr = partition(section_and_key, string_type(1, CharT('.')));
            if (pr.middle.empty())
                throw IndexError("Invalid Section and Key Format: \""
                                 + to_narrow(section_and_key) + '"');
            auto section = pr.left;
            auto key     = pr.right;
            auto sec_it  = data_.find(section);
            if (sec_it == data_.end())
                throw IndexError(
                    "Section \"" + to_narrow(section) + "\" Not Found");
            auto key_it = sec_it->second.find(key);
            if (key_it == sec_it->second.end())
                throw IndexError("Key \"" + to_narrow(key)
                                 + "\" Not Found in Section \""
                                 + to_narrow(section) + '"');
            return Item(key_it->second);
        }
 
        template <class T>
        T get(const string_type &section_and_key) const {
            return static_cast<T>(get(section_and_key));
        }

        template <class T>
        T
        get(const string_type &section_and_key, const T &default_value) const {
            auto pr = partition(section_and_key, string_type(1, CharT('.')));
            if (pr.middle.empty()) return default_value;
            auto section = pr.left;
            auto key     = pr.right;
            auto sec_it  = data_.find(section);
            if (sec_it == data_.end()) return default_value;
            auto key_it = sec_it->second.find(key);
            if (key_it == sec_it->second.end()) return default_value;
            return T(Item(key_it->second));
        }

        void set(const string_type &section_and_key, const string_type &value) {
            auto pr = partition(section_and_key, string_type(1, CharT('.')));
            if (pr.middle.empty())
                throw IndexError("Invalid Section and Key Format: \""
                                 + to_narrow(section_and_key) + '"');
            auto section        = pr.left;
            auto key            = pr.right;
            data_[section][key] = value;
        }

        bool has(const string_type &section_and_key) const {
            auto pr = partition(section_and_key, string_type(1, CharT('.')));
            if (pr.middle.empty()) {
                auto section = pr.left;
                return data_.find(section) != data_.end();
            } else {
                auto section = pr.left;
                auto key     = pr.right;
                auto sec_it  = data_.find(section);
                if (sec_it == data_.end()) return false;
                return sec_it->second.find(key) != sec_it->second.end();
            }
        }

        bool remove(const string_type &section_and_key) {
            auto pr = partition(section_and_key, string_type(1, CharT('.')));
            if (pr.middle.empty()) {
                auto section = pr.left;
                return data_.erase(section) > 0;
            } else {
                auto section = pr.left;
                auto key     = pr.right;
                auto sec_it  = data_.find(section);
                if (sec_it == data_.end()) return false;
                return sec_it->second.erase(key) > 0;
            }
        }

        const std::map<string_type, std::map<string_type, string_type>> &
        data() const {
            return data_;
        }
    };

    using INIConfig = BasicINIConfig<char>;

    using WINIConfig = BasicINIConfig<wchar_t>;
 
}