Meal.cpp

#include "IIKH.h" 

#include <random>
#include <vector>
#include <deque>
#include <iostream>
#include <numeric>
#include <algorithm>

using namespace std;

// Constructor that recommends a meal randomly
Meal::Meal(deque<Recipe> mealRecipeDB) {
    productMeal(mealRecipeDB);
}

// Constructor that takes main and side recipe databases
Meal::Meal(deque<Recipe> mainRecipeDB, deque<Recipe> sideRecipeDB) {
    inputHumanNum();
    productMeal(mainRecipeDB, sideRecipeDB);
}

// Recommend a meal randomly from a single recipe database
void Meal::productMeal(deque<Recipe> mealRecipeDB) {
    // Initialize random device
    random_device rd;
    mt19937 gen(rd());

    // Save the size of deque
    size_t Deque_size = mealRecipeDB.size();

    // Generate a random index
    int randnum = rd() % Deque_size;
    cout << mealRecipeDB[randnum].foodName << endl;
    meal.push_back(mealRecipeDB[randnum]);
}

// Recommend meals randomly from main and side recipes
void Meal::productMeal(deque<Recipe> mainRecipeDB, deque<Recipe> sideRecipeDB) {
    // Main dishes
    random_device rd;
    mt19937 gen(rd());
    size_t mainDeque_size = mainRecipeDB.size();

    // Create an index list for random selection
    vector<int> indices(mainDeque_size);
    iota(indices.begin(), indices.end(), 0); // Fill index from 0 to deque_size-1
    shuffle(indices.begin(), indices.end(), gen); // Shuffle the indices

    cout << "\n[MAIN]\n";
    // Print main dishes randomly
    for (int i = 0; i < mainMealNum; ++i) {
        cout << mainRecipeDB[indices[i]].foodName;
        if (i < mainMealNum - 1) {
            cout << ", ";
        }
        meal.push_back(mainRecipeDB[indices[i]]);
    }
    cout << endl;

    // Side dishes
    random_device rd2;
    mt19937 gen2(rd2());
    size_t sideDeque_size = sideRecipeDB.size();

    vector<int> indices2(sideDeque_size);
    iota(indices2.begin(), indices2.end(), 0);
    shuffle(indices2.begin(), indices2.end(), gen2);

    cout << "[SIDE]\n";
    for (int i = 0; i < sideMealNum; ++i) {
        cout << sideRecipeDB[indices2[i]].foodName;
        if (i < sideMealNum - 1) {
            cout << ", ";
        }
        meal.push_back(sideRecipeDB[indices2[i]]);
    }
    cout << endl;
}

// Input the number of people and determine main and side meal quantities
void Meal::inputHumanNum() {
    cout << "NUMBER OF PEOPLE: ";
    cin >> humanNum;

    if (humanNum > 0) {
        if (humanNum % 2 == 0) { // Even number
            mainMealNum = humanNum / 2;
            sideMealNum = humanNum / 2;
        }
        else { // Odd number
            mainMealNum = (humanNum - 1) / 2 + 1;
            sideMealNum = (humanNum - 1) / 2;
        }
    }
    else {
        cout << "NUMBER OF PEOPLE ERROR";
        return;
    }
}