inputtest.cpp

#include<bits/stdc++.h> //includes necessary libraries
//#include "SerialPort.h"
using namespace std; //defines where the functions used are
#define pds pair<double, string> //for faster typing
#define mp(a,b) make_pair(a,b)
#define all(a) a.begin(), a.end()
#define pb(a) push_back(a)
set <pds> song_list; //set (red-black tree- for our purposes, what matters is that it is sorted) holding song's bpm and identifiers
double delta = 5; //adding a delta to the step frequency, not a good idea to compare double wo delta (and also creating an interval makes it more likely to exist a song in that interval)
string range_tester = "aaa";
vector <string> last_played = {"00","00","00","00","00","00","00","00","00","00","00","00",
"00","00","00","00","00","00","00","00"}; //vector holding 20 last played songs; starts with dummies
double step_freq;
deque<double> last_freqs;
double prev_read=0, curr_read=0;
//String for incoming data
int how_many_steps = 0;
double curr_freq=0;
int elapsedtime;
/*
If i receive 0 (low) as a freq, can i recognize that as a break and just ignore?
I think I could
 */
/*
TODO:
-read frequency from file
-pretty much all file manipulation
-write chosen song to file
-read user's song list from file
-figure out how to get a song's spotify ID
-figure out how to connect to the bluetotooth board on the arduino
-figure out if i need an extra file to communicate with the Arduino
-
 */
int in_last_played(string to_test){
    for(int i=0;i<20;i++){
        if(last_played[i]==to_test){
            return i;
        }
    }
    return 10000;
}
//function to choose song
void decide_song(double frequency){
    double low = frequency-delta; //lower range of the interval
    double high = frequency+delta; //higher range
    //cout<<"low"<<low<<"high"<<high<<endl;
    //lower and upper bound - return pointer to elements just below and
    //just above the value passed
    auto interval_begin = lower_bound(all(song_list),mp(low, range_tester));
    auto interval_end = upper_bound(all(song_list),mp(high, range_tester));
    //best_choice - song in the interval that was played
    //the longest time ago. in case all songs in the interval 
    //are in the 20 last played, this will be played
    int best_choice = 19;
    //iterate through the interval
    if(interval_begin==interval_end && interval_end==song_list.end()){
      interval_end--;
      string chosen= (*interval_end).second;
      cout<<chosen<<endl;
      if(in_last_played(chosen)>20){
        last_played.erase(last_played.begin());
        last_played.pb(chosen);
      }else{
        last_played.erase(last_played.begin()+in_last_played(chosen));
        last_played.pb(chosen);
      }
      return;
    }else if(interval_begin==interval_end && interval_end==song_list.begin()){
      string chosen= (*song_list.begin()).second;
      cout<<chosen<<endl;
      if(in_last_played(chosen)>20){
        last_played.erase(last_played.begin());
        last_played.pb(chosen);
      }else{
        last_played.erase(last_played.begin()+in_last_played(chosen));
        last_played.pb(chosen);
      }
      return;
    }
    for(auto it = interval_begin;it != interval_end;it++){
        if(find(all(last_played),((*it).second))==last_played.end()){
            //found a song not among 20 last played!
            last_played.erase(last_played.begin());
            last_played.pb((*it).second);
            //here, write song to file
            cout<<(*it).second<<endl;
            return;
        }
         best_choice = min(best_choice, in_last_played((*it).second));
    }
    //all songs are in the 20 last_played
    cout<<(*(last_played.begin()+best_choice))<<endl;
    last_played.erase(last_played.begin()+best_choice);
    last_played.pb(range_tester);
    //here, write song to file
    return;
}
int main(){
    song_list.emplace(mp(130,"130 bpm-1"));song_list.emplace(mp(90,"90 bpm-1"));song_list.emplace(mp(100,"100 bpm-1"));song_list.emplace(mp(100,"100 bpm-1"));song_list.emplace(mp(80,"100 bpm-2"));song_list.emplace(mp(80,"80 bpm-1"));song_list.emplace(mp(97,"97 bpm-1"));song_list.emplace(mp(90,"90 bpm-2"));song_list.emplace(mp(120,"120 bpm-1"));
    //here, open doc with frequencies
    //the frequency used when choosing a new song will be the average of the
    //ten last frequencies
        //TODO: learn how to delay in c++ - 
        //can use sleep(5), sleep_for(nanoseconds(5000000))
        /*
        2 possible logics
        1-delay and always read
        2-read upon updating (TODO - learn how to do this)
         */
        //pop_front of freq, push back new frequency
        //calculate new average, save that to step_freq
        //choose a new song with the new step_freq
        //write the new song to the file
    //Check if data has been read or not
    //int how_many_steps = arduino.readSerialPort(incomingData, MAX_DATA_LENGTH);
    //cout<<"passos"<<how_many_steps<<endl;
    //cout<<"olhaso"<<arduino.readSerialPort(incomingData, MAX_DATA_LENGTH);
    //curr_read = curr_read-"0";
    //puts(incomingData);
    //cout<<"inc 0"<<incomingData[0]<<endl;
    //curr_read = incomingData[0]-'0';
    //cout<<"0men0"<<'0'-'0'<<endl;
    //cout<<"putting"<<endl;
    //puts(incomingData);
    cout<<endl;
    //how_many_steps+=curr_read;
    //cout<<"currread"<<curr_read<<endl;
    //prints out data
    /*
    if(curr_read!=prev_read){
      cout<<"diff"<<curr_read<<" "<<prev_read<<endl;
    }else{
      cout<<"same"<<curr_read<<" "<<prev_read<<endl;
    }
    prev_read=curr_read;
    //wait a bit
    */
   while(1){
   double curr_freq;
   cout<<"Please enter the frequency"<<endl;
   cin>>curr_freq;
   cout<<endl<<"would you like a new song? (y/n)"<<endl;
   char wants_song;
   cin>>wants_song;
   cout<<"curr freq"<<curr_freq<<endl;
   bool ignore = false;
	  if(curr_freq<10){
          //cout<<"ento"<<curr_freq<<endl;
		  ignore = true;
          cout<<"frequency too low; probably a break"<<endl;
	  }
		if(last_freqs.size()<10 && !ignore){
            //cout<<"caso 1"<<endl;
			step_freq += curr_freq/10;
			last_freqs.push_back(curr_freq); 
		}else if(!ignore){
            //cout<<"caso 2"<<endl;
			step_freq += curr_freq/10;
			step_freq-=last_freqs.front()/10;
			last_freqs.pop_front();
			last_freqs.push_back(curr_freq);
		}
    if(wants_song=='Y'||wants_song=='y'){
        cout<<"Song for"<<step_freq<<": "<<endl;
        decide_song(step_freq);
        cout<<endl;
    }
   }

}