//* Reading numeric data from a file - direct stream parsing *
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <cfloat>
using namespace std;


int main() {
    string inName;
    cout << "Read text from: ";
    cin  >> inName;
    ifstream inFile;
    inFile.open(inName.c_str());
    if (!inFile.is_open()) {
        cout << "ERROR: Cannot open " << inName << " file for reading." << endl;
        return(1);
    }

    string SSIDname;
    cout << "SSID to watch: ";
    cin  >> SSIDname;
    

    double sum=0.0;
    int    cnt=0;
    double max=-DBL_MAX;

    unsigned line=0;
    for (;;) {
        char c;

        c=inFile.peek();
        if (inFile.fail())
            break; // end of file or other serious reading error

        line++;
        cout << line << "\r";

        if (c=='#') {
            inFile.ignore(1024,'\n');
            continue;
        }

        while( (! inFile.fail()) && c!='(') inFile.get(c); // "eat" until '(' including it
        inFile.get(c); // eat space afterwards

        string SSIDcurrent;
        inFile >> SSIDcurrent;
        if (inFile.fail()) break;               // end of file or other serious reading error
        if (SSIDcurrent != SSIDname) continue;  // next line - interested only in a particular SSID

        while( (! inFile.fail()) && c!='[') inFile.get(c); // "eat" until '[' including it
        inFile.get(c); // eat space afterwards

        double x, y, z;
        inFile >> x >> y >> z;

        if (inFile.fail()) {
            cerr << "WARNING: Ignored corrupt SNR data in line " << line << endl;
            inFile.clear(); // clear the error status so that we can continue with reading
            inFile.ignore(1024,'\n'); 
            continue; // continue with the next line
        }

        inFile.ignore(1024,'\n'); // ignoring the reminder of the line so that next iteration starts with a new line
        // if that was the very last line without '\n' then we will handle end of file after attempting inFile.peek()

        sum=sum+x;
        cnt++;
        if (max<x)
            max=x;

    }
    inFile.clear();
    inFile.close();

    if (cnt==0)
        cout << "No data!" << endl;
    else {
        cout << "total: " << line << endl;
        cout << "data = " << cnt  << endl;
        cout << "avg  = " << sum/cnt << endl;
        cout << "max  = " << max  << endl;
    }

    return(0);
}
/*
Read text from: wifi.txt
SSID to watch: MMTEK
total: 156249
data = 1888
avg  = 27.0524
max  = 34
Press any key to continue . . .
*/