#include "commandLineParser.h"
#include <iostream>
#include <stdexcept> // for std::invalid_argument

//implement hashmap for the code
CLI::CLI(int argc, char** argv){
    try{
        if (arc < 2) {
            throw std::invalid_argument("Error: No input file provided.\n
                                         Usage: <program> <input_file>");
        }
        //sets program info
        programName = argv[0];
        inputFile = argv[1]

        //checks that file has correct file extension
        if(!(CLI::IsMarkupFile(inputFile))) {
            throw std::invalid_argument("Error: Invalid file extension. Expected a '.md' (Markdown) file.");
        }
        //stores remaining arguments
        for (int i = 1; i < argc; i++){
            args.push_back(argv[i]);
        }
        }
    catch (const std::invalid_argument& e) {
        std::cerr << e.what() << "\n";
        PrintHelp();
        std::exit(EXIT_FAILURE);
    }
    }

bool CLI::IsMarkupFile(const std::string& filename) {
    //markdown file extension
    const std::string requiredExtension = ".md";
    //checks to see if it can even include extension
    if (filename.size() <= requiredExtension.size()) {
        return false;
    }
    // Extracts the last N characters of the filename (where N is the length of the required extension)
    // and checks if they match the required file extension (e.g., ".md").
    //
    // Example:
    //   filename = "notes.md"
    //   requiredExtension = ".md"
    //   filename.substr(filename.size() - requiredExtension.size()) == ".md" → true
    //
    // Reference: https://en.cppreference.com/w/cpp/string/basic_string/substr
    return filename.substr(filename.size() - requiredExtension.size()) == requiredExtension;
}


//place to run commands but IDK IF WE SHOULD USE A HASMAP or how we are going to get each method to run
void CLI::RunCommands(){
    for (int i = 0; i < args.size(); i++){

    }    
}

void CLI::PrintHelp() const{
    std::cout << "Usage:\n"
              << " " << programName << " <input_file> REQUIRED\n"
              << "Flags:\n"
              << " --o, --output <outputFile>, optional output filename\n"
              << " --w, --watch, enables watchdog\n"
              << " --s, --stop, stops watchdog\n";
}