Timing.h

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#pragma once 


#include <chrono>
#include "Errors.h"

using time_ms = unsigned long;
using timept = std::chrono::high_resolution_clock::time_point;

timept now() { 
    return std::chrono::high_resolution_clock::now();
}

time_ms time_since(timept x) {
    return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now()-x).count();
}


// this is just handy for timing stuff -- put blocks of code between tic() and tic()
timept tic_start;
time_ms tic_elapsed;
void tic() {
    tic_elapsed =  time_since(tic_start);
    tic_start = now();
}
double elapsed_seconds() { 
    return tic_elapsed / 1000.0; 
}


std::string datestring() {
    //https://stackoverflow.com/questions/40100507/how-do-i-get-the-current-date-in-c
    
    time_t rawtime;
    struct tm * timeinfo;
    char buffer[80];

    time (&rawtime);
    timeinfo = localtime(&rawtime);

    strftime(buffer,80,"%Y-%m-%d %I:%M:%S",timeinfo);
    return std::string(buffer);
}




time_t convert_time(const std::string& s) {
    // specila case of s="0" will be allowed
    if(s == "0") return 0;
        
    // else we must specify a unit  
    double multiplier; // for default multiplier of 1 is seconds
    switch(s.at(s.length()-1)) {
        case 'q': multiplier = 1; break; // q=ms
        case 's': multiplier = 1000; break; 
        case 'm': multiplier = 60*1000; break;
        case 'h': multiplier = 60*60*1000; break;
        case 'd': multiplier = 60*60*24*1000; break;
        default: 
            std::cout << "*** Unknown time specifier: " << s.at(s.length()-1) << " in " << s << ". Did you forget a unit?" << std::endl;
            throw YouShouldNotBeHereError();
    }
    
    double t = std::stod(s.substr(0,s.length()-1)); // all but the last character
        
    return (unsigned long)(t*multiplier); // note this effectively rounds to the nearest second 
    
}