#include <iostream>
#include <cmath>
#include <fstream>
#include <cassert>
#include <graphics.h>

#define IN_FILE         "files/input.txt"
#define OUT_FILE        "files/output.txt"
#define HEIGHT          720
#define WIDTH           1280
#define STR_LEN         99
#define DIV_ERROR       "Cannot be divided by zero!"
#define SQRT_ERROR      "Cannot take the root of a negative number!"
#define OPEN_ERROR      "The file cannot be opened!"
#define CREATE_ERROR    "The file cannot be created!"

using namespace std;

class CompObj {
    protected:
        double calcPar;

    public:
        virtual void set() = 0;

        virtual void get() = 0;

        virtual void calc() = 0;

        virtual void getResult() = 0;
};

class PerfectGas : virtual public CompObj {
    private:
        double R;
        double T;
        double Kg;
        double M;
        double p;
        double p0;
        double K;

    public:
        PerfectGas() { R = T = Kg = M = p = p0 = K = 0; }

        PerfectGas(double _R, double _T, double _K, double _M, double _p, double _p0) : R(_R), T(_T), K(_K), M(_M), p(_p), p0(_p0) {}

        PerfectGas(const PerfectGas& x) {
            R   = x.R;
            T   = x.T;
            Kg  = x.Kg;
            M   = x.M;
            p   = x.p;
            p0  = x.p0;
            K   = x.K;
        }

        void set() {
            cout << "Enter info about perfect gas:" << endl;
            cout << " R = ";    cin >> R;
            cout << " T = ";    cin >> T;
            cout << " M = ";    cin >> M;
            cout << " p = ";    cin >> p;
            cout << " p0 = ";   cin >> p0;
            cout << " K = ";    cin >> K;
            cout << endl;
        }

        void get() {
            cout << "Info about perfect gas:" << endl;
            cout << " R = " << R << endl;
            cout << " T = " << T << endl;
            cout << " Kg = " << Kg << endl;
            cout << " M = " << M << endl;
            cout << " p = " << p << endl;
            cout << " p0 = " << p0 << endl;
            cout << " K = " << K << endl;
            cout << endl;
        }

        void calc() {
            assert(Kg * M && p0 && DIV_ERROR);

            calcPar = (2 * R * T / (Kg * M)) * (1 - pow(p / p0, Kg));

            assert(calcPar >= 0 && SQRT_ERROR);

            calcPar = sqrt(calcPar);
        }

        void calcKg() {
            assert(K && DIV_ERROR);

            Kg = (K - 1) / K;
        }

        void getResult() {
            cout << "Calculated parameter = " << calcPar << endl;
            cout << endl;
        }

        PerfectGas& operator = (const PerfectGas& x) {
            R   = x.R;
            T   = x.T;
            Kg  = x.Kg;
            M   = x.M;
            p   = x.p;
            p0  = x.p0;
            K   = x.K;

            return *this;
        }

        bool operator == (const PerfectGas& x) {return calcPar == x.calcPar;}

        bool operator != (const PerfectGas& x) {return calcPar != x.calcPar;}

        bool operator < (const PerfectGas& x) {return calcPar < x.calcPar;}

        bool operator <= (const PerfectGas& x) {return calcPar <= x.calcPar;}

        bool operator > (const PerfectGas& x) {return calcPar > x.calcPar;}

        bool operator >= (const PerfectGas& x) {return calcPar >= x.calcPar;}

        friend ifstream& operator >> (ifstream& ifs, PerfectGas& x);

        friend ofstream& operator << (ofstream& ofs, const PerfectGas& x);

        friend istream& operator >> (istream& is, PerfectGas& x);

        friend ostream& operator << (ostream& os, const PerfectGas& x);

        friend void tabulate(PerfectGas data, double dp, double p0, double p1,
                        string xLabel, string yLabel, string xSystem, string ySystem, ofstream& ofs);
};

ifstream& operator >> (ifstream& ifs, PerfectGas& x) {
    assert(ifs && OPEN_ERROR);

    ifs >> x.R >> x.T >> x.K >> x.M >> x.p >> x.p0;

    return ifs;
}

ofstream& operator << (ofstream& ofs, const PerfectGas& x) {
    assert(ofs && CREATE_ERROR);

    ofs << "Info about perfect gas:" << endl;
    ofs << " R  = " << x.R << endl;
    ofs << " T  = " << x.T << endl;
    ofs << " Kg = " << x.Kg << endl;
    ofs << " M  = " << x.M << endl;
    ofs << " p  = " << x.p << endl;
    ofs << " p0 = " << x.p0 << endl;
    ofs << " K  = " << x.K << endl;
    ofs << endl;

    return ofs;
}

istream& operator >> (istream& is, PerfectGas& x) {
    cout << "Enter info about perfect gas:" << endl;
    cout << " R  = ";   is >> x.R;
    cout << " T  = ";   is >> x.T;
    cout << " K  = ";   is >> x.K;
    cout << " M  = ";   is >> x.M;
    cout << " p  = ";   is >> x.p;
    cout << " p0 = ";   is >> x.p0;
    cout << endl;

    return is;
}

ostream& operator << (ostream& os, const PerfectGas& x) {
    os << "Info about perfect gas:" << endl;
    os << " R  = " << x.R << endl;
    os << " T  = " << x.T << endl;
    os << " Kg = " << x.Kg << endl;
    os << " M  = " << x.M << endl;
    os << " p  = " << x.p << endl;
    os << " p0 = " << x.p0 << endl;
    os << " K  = " << x.K << endl;
    os << endl;

    return os;
}

double getMin(double arr[], int n) {
    int i, iMin = 0;

    for (i = 1; i < n; i++) {
        if (arr[iMin] > arr[i]) {
            iMin = i;
        }
    }

    return arr[iMin];
}

double getMax(double arr[], int n) {
    int i, iMax = 0;

    for (i = 1; i < n; i++) {
        if (arr[iMax] < arr[i]) {
            iMax = i;
        }
    }

    return arr[iMax];
}

int convert(double c, double dc, double cMin) {
    return round((c - cMin) / dc);
}

void draw(double* x, double* y, int n, string xLabel, string yLabel, string xSystem, string ySystem) {
    string xLabelG;
    string yLabelG;

    double xMin = getMin(x, n);
    double xMax = getMax(x, n);
    double yMin = getMin(y, n);
    double yMax = getMax(y, n);

    int w = getmaxx();
    int h = getmaxy();

    double dx = (xMax - xMin) / w;
    double dy = (yMax - yMin) / (h - 10);

    string label = "Result";
    char labelBkp[STR_LEN];

    int i;

    setbkcolor(WHITE);
    setlinestyle(SOLID_LINE, 0, 5);
    cleardevice();
    setcolor(RED);

    for (i = 0; i < n - 1; i++) {
        line(convert(x[i], dx, xMin),
        h - convert(y[i], dy, yMin),
        convert(x[i + 1], dx, xMin),
        h - convert(y[i + 1], dy, yMin));
    }

    setcolor(BLUE);

    outtextxy(w / 2 - 10 * label.length(), 0, &label[0]);

    xLabelG = xLabel + ", " + xSystem;
    yLabelG = yLabel + ", " + ySystem;

    outtextxy(0, 0, &yLabelG[0]);
    outtextxy(w - 10 * xLabelG.length(), h - 20, &xLabelG[0]);

    setcolor(GREEN);

    snprintf(labelBkp, STR_LEN, "%lg", y[0]);

    outtextxy(0, h - 20, labelBkp);

    snprintf(labelBkp, STR_LEN, "%lg", y[n - 1]);

    outtextxy(0, 20, labelBkp);

    snprintf(labelBkp, STR_LEN, "%lg", (y[0] + y[n - 1]) / 2);

    outtextxy(0, h / 2, labelBkp);

    snprintf(labelBkp, STR_LEN, "%lg", x[0]);

    outtextxy(20, h - 30, labelBkp);

    snprintf(labelBkp, STR_LEN, "%lg", x[n - 1]);

    outtextxy(w - 30, h - 30, labelBkp);

    snprintf(labelBkp, STR_LEN, "%lg", (x[0] + x[n - 1]) / 2);

    outtextxy(w / 2, h - 30, labelBkp);
}

void tabulate(PerfectGas data, double dp, double p0, double p1,
            string xLabel, string yLabel, string xSystem, string ySystem, ofstream& ofs) {
    double p = p0;
    int n = ((p1 - p0) / dp) + 1, i = 0;
    double x[n], y[n];

    do {
        x[i] = p;

        data.p0 = p;
        data.calc();

        y[i] = data.calcPar;

        p += dp;

        cout << xLabel << " = " << x[i] << " => " << yLabel << " = " << y[i] << endl;
        ofs << xLabel << " = " << x[i] << " => " << yLabel << " = " << y[i] << endl;

        i++;
    } while (p <= (p1 + 1e-7));

    draw(x, y, n, xLabel, yLabel, xSystem, ySystem);
    getch();
}

int main() {
    initwindow(WIDTH, HEIGHT);

    cout << "###Constructors test###" << endl << endl;

    PerfectGas x;

    cout << "Default constructor:" << endl << x;

    PerfectGas y(1.2, 3, 4.5, 7.8, 3.5, 6.8);

    y.calcKg();

    cout << "Init constructor:" << endl << y;

    PerfectGas z = y;

    cout << "Copy constructor:" << endl << z;

    cout << "###Functions test###" << endl << endl;

    cout << "Set function:" << endl;
    x.set();

    cout << "Get function:" << endl;
    x.get();

    x.calcKg(); x.calc();

    cout << "Result function:" << endl;
    x.getResult();

    cout << "###Operators test###" << endl << endl;

    cout << "x object:" << endl;
    x.get();

    cout << "y object:" << endl;
    y.get();

    cout << "Operator == between obj x & y" << endl;
    cout << "result = " << boolalpha << (x == y) << endl << endl;

    cout << "Operator != between obj x & y" << endl;
    cout << "result = " << boolalpha << (x != y) << endl << endl;

    cout << "Operator < between obj x & y" << endl;
    cout << "result = " << boolalpha << (x < y) << endl << endl;

    cout << "Operator <= between obj x & y"  << endl;
    cout << "result = " << boolalpha << (x <= y) << endl << endl;

    cout << "Operator > between obj x & y" << endl;
    cout << "result = " << boolalpha << (x > y) << endl << endl;

    cout << "Operator >= between obj x & y" << endl;
    cout << "result = " << boolalpha << (x >= y) << endl << endl;

    cout << "Operator = between obj x & y" << endl;
    x = y;

    cout << "x object:" << endl;
    x.get();

    cout << "y object:" << endl;
    y.get();

    cout << "###Reading from file and calculating value###" << endl << endl;

    PerfectGas a; ifstream ifs(IN_FILE); ofstream ofs(OUT_FILE);

    ifs >> a;

    a.calcKg(); a.calc();

    cout << a;

    a.getResult();

    cout << "###Tabulate func###" << endl << endl;

    double dp, p0, p1;

    cout << "Enter dp, p0 & p1: ";
    cin >> dp >> p0 >> p1;

    cout << endl << "Result:" << endl;
    ofs << "Result:" << endl;

    tabulate(a, dp, p0, p1, "p0", "w", "ata", "m/s", ofs);

    return 0;
}