/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   Main.cpp                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lfirmin <lfirmin@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/07/01 23:30:01 by lfirmin           #+#    #+#             */
/*   Updated: 2025/07/01 23:48:50 by lfirmin          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <string>
#include <iostream>
#include <fstream>

static int open_files(std::string nameInputFile, std::string nameOutputfile,
		std::ifstream *inputFile, std::ofstream *outputFile)
{
	(*inputFile).open(nameInputFile.c_str(), std::fstream::in);
	if (!inputFile->is_open())  // ou if (!(*inputFile))
	{
		std::cerr << "Failed to open input file!" << std::endl;
		return (1);
	}    
	(*outputFile).open(nameOutputfile.c_str(), std::fstream::out);
	if (!outputFile->is_open())  // ou if (!(*outputFile))
	{
		std::cerr << "Failed to open output file!" << std::endl;
		(*inputFile).close();
		return (1);
	}
	return (0);
}

static void read_and_replace(char **argv, std::ifstream *inputFile, std::ofstream *outputFile)
{
	std::string 			to_find;
	std::string 			to_replace;
	std::string 			line;
	std::string::size_type	found;
	size_t					end_last_found;
	std::string				replaced_line;

	to_find = *(argv + 2);
	to_replace = *(argv + 3);
	end_last_found = 0;

	while(std::getline(*inputFile, line))
	{

		if (to_find.empty())
		{
			if (!(*inputFile).eof())
				*outputFile << line << std::endl;
			else
				*outputFile << line;
		}
		else
		{
			replaced_line.clear();
			end_last_found = 0;
			found = line.find(to_find);
			if (found != std::string::npos)
			{
				while (found != std::string::npos)
				{
					replaced_line.append(line,end_last_found,found - end_last_found);
					replaced_line += to_replace;
					end_last_found = found + to_find.length();
					found = line.find(to_find, end_last_found);
					if (found == std::string::npos)
						replaced_line.append(line, end_last_found,line.length());
				}
			}
			else
				replaced_line = line;
			if (!(*inputFile).eof())
				*outputFile << replaced_line << std::endl;
			else
				*outputFile << replaced_line;
		}
	}
}

int main(int argc, char **argv)
{
	std::string nameInputFile;
	std::string nameOutputfile;
	std::ifstream inputFile;
	std::ofstream outputFile;

	if (argc != 4)
		return (std::cerr << "./sed <Filename> <S1> <S2>" << std::endl, 0);
	nameInputFile = argv[1];
	nameOutputfile = nameOutputfile + argv[1] + ".replace";
	if (open_files(nameInputFile, nameOutputfile, &inputFile, &outputFile))
		return (1);
	read_and_replace(argv, &inputFile, &outputFile);
	inputFile.close();
	outputFile.close();
	return (0);
}