struct node {
    struct node *next;
    int e;
    };

struct Hashtable {
    unsigned Tablesize;
    struct node *Cells;
    };

struct forecast_temp{
    float min;
    float max;
    char desc[25];
    char icon[8];
};

struct meteoforecast_data{
    int datetime;
    bool isValid;
    struct forecast_temp previsions;
};

typedef void (*weather_data_callback)(struct meteoforecast_data *datas);
typedef void (*weather_data_start_callback)();

typedef struct {
    unsigned int humidity;
    float temperature;
    float pressure;
    unsigned long retreival_period;
    weather_data_callback data_retreived_cb;
    weather_data_start_callback data_retreived_cb_start;
} weather_data;

void printftemp(struct forecast_temp *tmp);
void printffd(struct meteoforecast_data *tmp);

void on_weather_data_retrieval(weather_data_callback data_retreived_cb);
void on_weather_data_retrieval_start(weather_data_callback data_retreived_cb);
void initialise_weather_data_retrieval(unsigned long retreival_period);