_read.hpp

/*    AD-DEV Public General License
 *       Version 1.0.0, December 2025
 *
 *  Copyright (c) 2025-2026 AD-iOS (ad-ios334@outlook.com) All rights reserved.
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 *
 *  We hereby grant you the following rights, subject to the following conditions, a worldwide, royalty-free, non-exclusive, irrevocable license to:
 *    1. Use, copy, and modify the Software
 *    2. Create derivative works
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 *  Conditions:
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 *    3. Unauthorized commercial use is prohibited
 *    4. All modifications and derivative products based on the Software must use this License and disclose the original source code
 *    5. Disclosure of the original source code is not required when using the Software unmodified (e.g., via APIs, libraries, automatic linkers, etc.)
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 *  Anyone may distribute or copy this License file, but may not modify it.
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/*
 * _read.hpp
 * Created by AD on 20/12/25
 * Copyright (c) 2025-2026 AD All rights reserved.
**/

#ifndef _AD_READ_HPP_
#define _AD_READ_HPP_

#include <fstream>
#include <string>
#include <vector>
#include <sstream>
#include <iostream>
#include <filesystem>

#include "AD_output.hpp"

namespace AD {

inline std::string _AD_read_all(const std::string& path) {
    std::ifstream file(path);
    if (!file.is_open()) {
        AD::cerr << "[Error] Cannot open file: " << path << AD::endl;
        return "";
    }
    std::stringstream buffer;
    buffer << file.rdbuf();
    return buffer.str();
}

inline std::vector<std::string> _AD_read_lines(const std::string& path) {
    std::vector<std::string> lines;
    std::ifstream file(path);
    if (!file.is_open()) {
        AD::cerr << "[Error] Cannot open file: " << path << AD::endl;
        return lines;
    }
    std::string line;
    while (std::getline(file, line)) {
        lines.push_back(line);
    }
    return lines;
}

inline bool _AD_readable(const std::string& path) {
    std::ifstream file(path);
    return file.good();
}

inline std::string _AD_read_lines(const std::string& path, size_t line_number) {
    std::ifstream file(path);
    if (!file.is_open()) {
        AD::cerr << "[Error] Cannot open file: " << path << AD::endl;
        return "";
    }
    
    std::string line;
    for (size_t i = 0; i <= line_number; ++i) {
        if (!std::getline(file, line)) {
            AD::cerr << "[Error] Line " << line_number << " not found in: " << path << AD::endl;
            return "";
        }
    }
    return line;
}

inline std::vector<std::string> _AD_read_lines(const std::string& path, 
                                                size_t start_line, 
                                                size_t end_line) {
    std::vector<std::string> lines;
    std::ifstream file(path);
    
    if (!file.is_open()) {
        AD::cerr << "[Error] Cannot open file: " << path << AD::endl;
        return lines;
    }
    
    if (start_line > end_line) {
        AD::cerr << "[Error] Invalid line range: start > end" << AD::endl;
        return lines;
    }
    
    std::string line;
    size_t current_line = 0;
    
    while (std::getline(file, line)) {
        if (current_line >= start_line && current_line <= end_line) {
            lines.push_back(line);
        }
        if (current_line > end_line) break;
        current_line++;
    }
    
    if (lines.empty() && start_line <= end_line) {
        AD::cerr << "[Error] No lines found in range [" << start_line << ", " 
                 << end_line << "] in: " << path << AD::endl;
    }
    
    return lines;
}

} // namespace AD

#endif