// Functions related to parsing JSON strings and objects.

import '/var/config.dart';
import 'package:flutter/material.dart';
import 'dart:math';

String formatOpenWeatherData(var data) {
  String location = pullOpenWeatherCity(data),
      temp = pullOpenWeatherTemp(data),
      conditions = pullOpenWeatherConditions(data),
      windSpeed = pullOpenWeatherWind(data),
      humidity = pullOpenWeatherHumidity(data);

  String windChill = getWindChill(temp, windSpeed), heatIndex = "";

  String comfort = "";

  String text =
      "$location is $temp$tempUnits and $conditions"
      " with a wind speed of $windSpeed$windUnits"
      " and humidity of $humidity$humidityUnits."
      " $windChill$heatIndex"
      " $comfort";

  final String doubleSpace = "  ", singleSpace = " ";
  while (text.contains(doubleSpace)) {
    text = text.replaceAll(doubleSpace, singleSpace);
  }

  return text;
}

String pullOpenWeatherCity(var data) {
  String location = "${data['city']['name']} (${data['city']['country']})";
  if (debug) {
    debugPrint("DEBUG: location = '$location'");
  }
  return location;
}

String pullOpenWeatherTemp(var data) {
  String temp = data['list'][0]['main']['temp'].toString();
  if (debug) {
    debugPrint("DEBUG: temp = '$temp'");
  }
  return temp;
}

String pullOpenWeatherConditions(var data) {
  String conditions = data['list'][0]['weather'][0]['description'].toString();
  if (debug) {
    debugPrint("DEBUG: conditions = '$conditions'");
  }
  return conditions;
}

String pullOpenWeatherWind(var data) {
  String wind = data['list'][0]['wind']['speed'].toString();
  if (debug) {
    debugPrint("DEBUG: wind = '$wind'");
  }
  return wind;
}

String pullOpenWeatherHumidity(var data) {
  String humidity = data['list'][0]['main']['humidity'].toString();
  if (debug) {
    debugPrint("DEBUG: humidity = '$humidity'");
  }
  return humidity;
}

double calcWindChill(double temp, double windSpeed) {
  // ## Wind Chill ##
  // # Wind speed as noted in: https://answers.yahoo.com/question/index?qid=20091020183148AAHm3kB&guccounter=1
  // # More official source: https://www.weather.gov/media/epz/wxcalc/windChill.pdf
  double windChill =
      35.74 +
      (0.6215 * temp) -
      (35.75 * pow(windSpeed, 0.16)) +
      (0.4275 * temp * pow(windSpeed, 0.16));
  if (debug) {
    debugPrint("DEBUG: windChill = '$windChill'");
  }
  return windChill;
}

String getWindChill(String temp, String windSpeed) {
  double temperature = double.parse(temp);
  double wind = double.parse(windSpeed);

  if (temperature < 50 && wind > 5) {
    double windChill = calcWindChill((temperature), (wind));
    return "My guess is that's a wind chill of $windChill$tempUnits";
  }

  return "";
}