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#include <vdr/plugin.h>
#include <string>
#include <sstream>
#include <jansson.h>
#include "../config.h"
#include "../tools/curlfuncs.h"
#include "../tools/filesystem.h"
#include "forecastio.h"
using namespace std;
extern cWeatherforecastConfig weatherConfig;
cForecastIO::cForecastIO(string cacheDir) {
forecastFile = *cString::sprintf("%s/%s", cacheDir.c_str(), "weather.json");
cacheDurationDefault = 60 * 60 * weatherConfig.hoursToUpdate;
apiKey = "9830052ef63efbec84ec0639e9a205d2";
string osdLanguage = Setup.OSDLanguage;
language = osdLanguage.substr(0,2);
unit = "si";
baseURL = "https://api.forecast.io/forecast";
latitude = weatherConfig.lat;
longitude = weatherConfig.lon;
current = NULL;
hourly = NULL;
daily = NULL;
}
cForecastIO::~cForecastIO() {
Clear();
}
/*****************************************************************
* PUBLIC FUNCTIONS
*****************************************************************/
void cForecastIO::Action(void) {
loopActive = true;
ReadForecastInitial();
waitMutex.Lock();
while (loopActive && Running()) {
waitCondition.TimedWait(waitMutex, 1000 * 60);
if (!loopActive)
return;
if (!CacheFileValid()) {
ReadForecast();
}
}
}
void cForecastIO::Stop() {
loopActive = false;
waitCondition.Broadcast();
Cancel(1);
while (Active())
cCondWait::SleepMs(10);
}
cForecast *cForecastIO::GetCurrentForecast(void) {
time_t now = time(0);
if (current && current->TimeMatch(now)) {
return current;
}
if (hourly) {
return hourly->GetCurrent();
}
return NULL;
}
bool cForecastIO::SetCurrentWeather(cServiceCurrentWeather *call) {
cForecast *currentForecast = GetCurrentForecast();
if (!currentForecast)
return false;
call->timeStamp = currentForecast->GetDateTimeString();
call->temperature = currentForecast->GetTemperatureString();
call->apparentTemperature = currentForecast->GetApparentTemperatureString();
call->summary = currentForecast->GetSummary();
call->icon = currentForecast->GetIcon();
call->precipitationIntensity = currentForecast->GetPrecipIntensityString();
call->precipitationProbability = currentForecast->GetPrecipProbabilityPercent();
call->precipitationType = currentForecast->GetPercipType();
call->humidity = currentForecast->GetHumidityPercent();
call->windSpeed = currentForecast->GetWindSpeedString();
call->windBearing = currentForecast->GetWindBearing();
call->windBearingString = currentForecast->GetWindBearingString();
call->visibility = currentForecast->GetVisibilityString();
call->cloudCover = currentForecast->GetCloudCoverPercent();
call->pressure = currentForecast->GetPressureString();
call->ozone = currentForecast->GetOzoneString();
cForecast *dailyForecast = daily->GetFirstDaily();
if (!dailyForecast)
return true;
call->minTemperature = dailyForecast->GetTemperatureMinString();
call->maxTemperature = dailyForecast->GetTemperatureMaxString();
return true;
}
/*****************************************************************
* PRIVATE FUNCTIONS
*****************************************************************/
void cForecastIO::Clear(void) {
if (current) {
delete current;
current = NULL;
}
if (hourly) {
delete hourly;
hourly = NULL;
}
if (daily) {
delete daily;
daily = NULL;
}
}
bool cForecastIO::CheckUserApiKey(void) {
if (weatherConfig.userApiKey.size() == 0)
return false;
if (weatherConfig.userApiKey.compare(apiKey) == 0) {
return false;
}
return true;
}
int cForecastIO::CalculateCachDuration(void) {
if (!CheckUserApiKey())
return cacheDurationDefault;
if (weatherConfig.userHoursToUpdate > 0 && weatherConfig.userHoursToUpdate <= 24) {
return weatherConfig.userHoursToUpdate * 60 * 60;
}
return cacheDurationDefault;
}
bool cForecastIO::CacheFileValid(void) {
if (!FileExists(forecastFile)) {
dsyslog("weatherforecast: no cached forecast available");
return false;
}
int cacheDuration = CalculateCachDuration();
time_t fileCreation = FileCreationTime(forecastFile);
time_t now = time(0);
int age = now - fileCreation;
int ageHours = age / 3600;
int ageMinutes = (age%3600) / 60;
if (age > cacheDuration) {
dsyslog("weatherforecast: cached forecast is outdated (age %dh %dmin, cache duration %dh)", ageHours, ageMinutes, cacheDuration / 3600);
return false;
}
return true;
}
void cForecastIO::ReadForecastInitial(void) {
string forecastJson = "";
if (!CacheFileValid()) {
//get new from forecast.io
dsyslog("weatherforecast: fetching forecast newly from forecast.io");
forecastJson = FetchOnlineForecast();
WriteIntoFile(forecastFile, forecastJson);
} else {
//using cached data
dsyslog("weatherforecast: using cached forecast");
forecastJson = ReadFromFile(forecastFile);
}
ParseForecast(forecastJson);
}
void cForecastIO::ReadForecast(void) {
dsyslog("weatherforecast: updating forecast from forecast.io");
string forecastJson = "";
forecastJson = FetchOnlineForecast();
if (forecastJson.size() > 0) {
WriteIntoFile(forecastFile, forecastJson);
Lock();
Clear();
ParseForecast(forecastJson);
Unlock();
}
}
string cForecastIO::FetchOnlineForecast(void) {
string myApiKey = apiKey;
if (CheckUserApiKey())
myApiKey = weatherConfig.userApiKey;
stringstream url;
url << baseURL << "/" << myApiKey;
url << "/" << latitude << "," << longitude;
url << "?lang=" << language << "&units=" << unit;
string outputForecastIO;
esyslog("weatherforecast: calling URL %s", url.str().c_str());
CurlGetUrl(url.str().c_str(), &outputForecastIO);
return outputForecastIO;
}
bool cForecastIO::ParseForecast(string &jsonForecast) {
json_t *root;
json_error_t error;
root = json_loads(jsonForecast.c_str(), 0, &error);
if ( !root ) {
return false;
}
if ( !json_is_object(root) ) {
return false;
}
//reading current weather
json_t *currentWeather = json_object_get(root, "currently");
if (!json_is_object(currentWeather)) {
return false;
}
current = new cForecast();
current->SetForecastType(ftCurrent);
current->SetForecast(currentWeather);
//current->Debug();
//reading 48 hour forecast
json_t *hourlyWeather = json_object_get(root, "hourly");
if (!json_is_object(hourlyWeather)) {
return false;
}
hourly = new cForecasts();
hourly->SetForecastType(ftHourly);
hourly->SetForecast(hourlyWeather);
//hourly->Debug();
//reading 7 day forecast
json_t *dailyWeather = json_object_get(root, "daily");
if (!json_is_object(dailyWeather)) {
return false;
}
daily = new cForecasts();
daily->SetForecastType(ftDaily);
daily->SetForecast(dailyWeather);
//daily->Debug();
return true;
}
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