#include <iostream>
#include <ctime>
#include <cmath>

using namespace std;

void menu() {
    cout << "============================" << endl;
    cout << "=========== MENU ===========" << endl;
    cout << "============================" << endl;
    cout << "1 ... GENERATE WATER INTAKES" << endl;
    cout << "2 ... PRINT WATER INTAKES" << endl;
    cout << "3 ... AVERAGE" << endl;
    cout << "4 ... DAYS UNDER AVERAGE" << endl;
    cout << "5 ... THE MOST WATER" << endl;
    cout << "6 ... IN LIMIT" << endl;
    cout << "7 ... ALL THE WATER" << endl;
    cout << "0 ... EXIT" << endl;
    cout << "============================" << endl;
    cout << "Select: ";
}

float map(float value, float start1, float stop1, float start2, float stop2) {
    return start2 + (stop2 - start2) * ((value - start1) / (stop1 - start1));
}

void fillArray(float *array, const unsigned int size) {
    float rand_number;
    for (unsigned int i = 0; i < size; i++) {
        rand_number = map(rand(), 0, RAND_MAX, 0.5, 3.5);
        rand_number = round(10 * rand_number) / 10;
        array[i] = rand_number;
    }
}

void printArray(const float *array, const unsigned int size) {
    for (unsigned int i = 0; i < size; i++) {
        cout << "Day: " << i << " --> " << array[i] << "L\n";
    }
}

float sum(const float *array, const unsigned int size) {
    float liters = 0;
    for (unsigned int i = 0; i < size; i++) {
        liters += array[i];
    }
    return liters;
}

float average(const float *array, const unsigned int size) {
    float liters = sum(array, size);
    liters = liters / size;
    liters = round(10 * liters) / 10;
    return liters;
}

void under_average(const float *array, const unsigned int size) {
    float avg = average(array, size);
    unsigned int dni = 0;
    for (unsigned int i = 0; i < size; i++) {
        if (avg > array[i]) {
            cout << "Day: " << i << " --> " << array[i] << "L\n";
            dni++;
        }
    }
    cout << dni << " days are under average \n";
}

void max_day(const float *array, const unsigned int size) {
    float max_drank = array[0];
    unsigned int day;
    for (unsigned int i = 0; i < size; i++) {
        if (max_drank < array[i]) {
            max_drank = array[i];
            day = i;
        }
    }
    cout << "On day " << day << " you drank the most water " << max_drank << "L";
}

void in_limit(const float *array, const unsigned int size) {
    unsigned int day = 0;
    for (unsigned int i = 0; i < size; i++) {
        if (2.0 <= array[i] && array[i] <= 2.5) {
            cout << "Day: " << i << " --> " << array[i] << "L\n";
            day++;
        }
    }
    cout << day << endl;
}

int main() {
    const unsigned int days = 30;
    float *waterIntakes = new float[days];
    float tmp;
    srand(time(nullptr));

    fillArray(waterIntakes, days);

    bool running = true;
    int selection;

    do {
        menu();
        cin >> selection;
        cout << endl;
        switch (selection) {
            case 1:
                fillArray(waterIntakes, days);
                break;
            case 2:
                printArray(waterIntakes, days);
                break;
            case 3:
                tmp = average(waterIntakes, days);
                cout << "On average you drank " << tmp << "L a day";
                break;
            case 4:
                under_average(waterIntakes, days);
                break;
            case 5:
                max_day(waterIntakes, days);
                break;
            case 6:
                in_limit(waterIntakes, days);
                break;
            case 7:
                tmp = sum(waterIntakes, days);
                cout << "Vsa voda popita" << tmp;
                break;
            case 0:
                running = false;
                break;
            default:
                cout << "Wrong selection!" << endl;
                break;
        }
        cout << endl;
    } while (running);

    delete[] waterIntakes;

    return 0;
}

// izpis celotne kolicine vode