// CMSC 341 - Spring 2024 - Project 4
#include "vacdb.h"
#include <math.h>
#include <random>
#include <vector>
#include <algorithm>
#include <ctime>     //used to get the current time
// We can use the Random class to generate the test data randomly!
enum RANDOM {UNIFORMINT, UNIFORMREAL, NORMAL, SHUFFLE};
class Random {
public:
    Random(int min, int max, RANDOM type=UNIFORMINT, int mean=50, int stdev=20) : m_min(min), m_max(max), m_type(type)
    {
        if (type == NORMAL){
            //the case of NORMAL to generate integer numbers with normal distribution
            m_generator = std::mt19937(m_device());
            //the data set will have the mean of 50 (default) and standard deviation of 20 (default)
            //the mean and standard deviation can change by passing new values to constructor 
            m_normdist = std::normal_distribution<>(mean,stdev);
        }
        else if (type == UNIFORMINT) {
            //the case of UNIFORMINT to generate integer numbers
            // Using a fixed seed value generates always the same sequence
            // of pseudorandom numbers, e.g. reproducing scientific experiments
            // here it helps us with testing since the same sequence repeats
            m_generator = std::mt19937(10);// 10 is the fixed seed value
            m_unidist = std::uniform_int_distribution<>(min,max);
        }
        else if (type == UNIFORMREAL) { //the case of UNIFORMREAL to generate real numbers
            m_generator = std::mt19937(10);// 10 is the fixed seed value
            m_uniReal = std::uniform_real_distribution<double>((double)min,(double)max);
        }
        else { //the case of SHUFFLE to generate every number only once
            m_generator = std::mt19937(m_device());
        }
    }
    void setSeed(int seedNum){
        // we have set a default value for seed in constructor
        // we can change the seed by calling this function after constructor call
        // this gives us more randomness
        m_generator = std::mt19937(seedNum);
    }

    void getShuffle(vector<int> & array){
        // the user program creates the vector param and passes here
        // here we populate the vector using m_min and m_max
        for (int i = m_min; i<=m_max; i++){
            array.push_back(i);
        }
        shuffle(array.begin(),array.end(),m_generator);
    }

    void getShuffle(int array[]){
        // the param array must be of the size (m_max-m_min+1)
        // the user program creates the array and pass it here
        vector<int> temp;
        for (int i = m_min; i<=m_max; i++){
            temp.push_back(i);
        }
        std::shuffle(temp.begin(), temp.end(), m_generator);
        vector<int>::iterator it;
        int i = 0;
        for (it=temp.begin(); it != temp.end(); it++){
            array[i] = *it;
            i++;
        }
    }

    int getRandNum(){
        // this function returns integer numbers
        // the object must have been initialized to generate integers
        int result = 0;
        if(m_type == NORMAL){
            //returns a random number in a set with normal distribution
            //we limit random numbers by the min and max values
            result = m_min - 1;
            while(result < m_min || result > m_max)
                result = m_normdist(m_generator);
        }
        else if (m_type == UNIFORMINT){
            //this will generate a random number between min and max values
            result = m_unidist(m_generator);
        }
        return result;
    }

    double getRealRandNum(){
        // this function returns real numbers
        // the object must have been initialized to generate real numbers
        double result = m_uniReal(m_generator);
        // a trick to return numbers only with two deciaml points
        // for example if result is 15.0378, function returns 15.03
        // to round up we can use ceil function instead of floor
        result = std::floor(result*100.0)/100.0;
        return result;
    }

    string getRandString(int size){
        // the parameter size specifies the length of string we ask for
        // to use ASCII char the number range in constructor must be set to 97 - 122
        // and the Random type must be UNIFORMINT (it is default in constructor)
        string output = "";
        for (int i=0;i<size;i++){
            output = output + (char)getRandNum();
        }
        return output;
    }
    
    private:
    int m_min;
    int m_max;
    RANDOM m_type;
    std::random_device m_device;
    std::mt19937 m_generator;
    std::normal_distribution<> m_normdist;//normal distribution
    std::uniform_int_distribution<> m_unidist;//integer uniform distribution
    std::uniform_real_distribution<double> m_uniReal;//real uniform distribution

};
class Tester{

};

unsigned int hashCode(const string str);

string namesDB[6] = {"john", "serina", "mike", "celina", "alexander", "jessica"};

int main(){
    
    vector<Patient> dataList;
    Random RndID(MINID,MAXID);
    Random RndName(0,5);// selects one from the namesDB array
    Random RndQuantity(0,50);
    VacDB vacdb(MINPRIME, hashCode, DOUBLEHASH);
    bool result = true;
    
    for (int i=0;i<49;i++){
        // generating random data
        Patient dataObj = Patient(namesDB[RndName.getRandNum()], RndID.getRandNum(), true);
        // saving data for later use
        dataList.push_back(dataObj);
        // inserting data in to the VacDB object
        if (!vacdb.insert(dataObj)) cout << "Did not insert " << &dataObj << endl;
    }
    
    vacdb.dump();
    
    // checking whether all data are inserted
    for (vector<Patient>::iterator it = dataList.begin(); it != dataList.end(); it++){
        result = result && (*it == vacdb.getPatient((*it).getKey(), (*it).getSerial()));
    }
    if (result)
        cout << "All data points exist in the VacDB object!\n";
    else
        cout << "Some data points are missing in the VacDB object\n";
   
    return 0;
}
unsigned int hashCode(const string str) {
   unsigned int val = 0 ;
   const unsigned int thirtyThree = 33 ;  // magic number from textbook
   for (unsigned int i = 0 ; i < str.length(); i++)
      val = val * thirtyThree + str[i] ;
   return val ;
}