/*
Purpose: Create a program that allows combining all files in a directory into one singular file.
How To Use: Place file within the SAME directory as all of your files. Also, this is for that single directory, NOT recursive.
C++ Version Requirement: C++17 or higher.

Algorithm Steps:
    1. Set path all files are in.
    2. Open one file at a time using directory_iterator.
    3. For each file:
        a. Open file and make sure it is actually open. If not, send error msg and stop program.
        b. Call a function that gets data from the input file and stores it into a vector called fileLines.
        c. Call a function that stores the vector's data into an output file & closes it.

*/
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <filesystem>
namespace fs = std::filesystem;

// Function references
void getInFileData(std::ifstream &inFile, std::vector<std::string> &v);
void storeDataInNewFile(std::vector<std::string> &v);

int main () {
    // 1. Set path all files are in.
    //fs::path p("C:\\Users\\Tom\\Desktop\\Anti-Shop-Exploits-v2\\1.15_Data\\recipes");

    // 2. Open one file at a time using directory_iterator.
    std::vector<std::string> fileLines;
    for (fs::directory_entry &elem : fs::directory_iterator()) {
    //for ( auto &elem : fs::directory_iterator(p) ) {
        // 3a. Open file and make sure it is actually open. If not, send error msg and stop program.
        std::ifstream inFile(elem);
        inFile.open(elem);

        if (!inFile.is_open()) {
            std::cout << "[Error] Could not open input file: " << elem << "\nStopping program...\n";
            inFile.close();
            exit(1);
        }

        // 3b. Call a function that gets data from the input file and stores it into a vector called fileLines.
        getInFileData(inFile, fileLines);

        // 3c. Call a function that stores the vector's data into an output file & closes it.
        storeDataInNewFile(fileLines);
    }


    return 0;
}


// 3b. Function Purpose: Get data from the input file and store it into referenced vector.
void getInFileData(std::ifstream &inFile, std::vector<std::string> &v) {
    v.clear(); // Empty vector.

    // For each line in CURRENT file, store data into vector.
    for (int i = 0; std::getline(inFile, v[i]); ++i);

    // 2d. Once program has stored all of the file's lines into the vector, close inFile.
    inFile.close();
}


// 3c. Function Purpose: Store the vector's data into an output file & close it.
//      - Declare path.
//      - Open path / output file.
//      - Make sure it is open.
//      - Store all data from vector into output file using a loop.
//      - Create a new line to indicate the end of a file and the beginning of a new file (within the output file).
//      - Close File.
void storeDataInNewFile(std::vector<std::string> &v) {
    // Declare path.
    fs::path filePath("C:\\Users\\Tom\\Desktop\\Anti-Shop-Exploits-v2\\1.15_Data\\recipes\\allData.json"); // Absolute (Full) Path

    // Open path / output file.
    std::ofstream outFile(fs::absolute(filePath));

    // Make sure it is open.
    if (!outFile.is_open()) {
        std::cout << "[Error] Could not open output file: " << filePath << "\nStopping program...\n";
        exit(1);
    }

    // Store all data from vector into output file using a loop.
    const int vSize = v.size();
    for (int i = 0; i < vSize; ++i) {
        outFile << v[i];
    }

    // Create a new line to indicate the end of a file and the beginning of a new file (within the output file).
    outFile << "\n";

    outFile.close();
}