#include <iostream>
#include <string>
#include <stdexcept>
#include "ElevationReader.h"
void print_usage() 
{
    std::cerr << "Usage: elevation_cli <path_to_hgt_directory> <latitude> <longitude>" << std::endl;
    std::cerr << "Example: elevation_cli ../geoelevation_dem_cache/hgt_tiles 45.07 7.68" << std::endl;
}

int main(int argc, char* argv[]) 
{
    if (argc != 4) 
    {
        print_usage();
        return 1;
    }
    
    std::string hgt_dir;
    double lat, lon;
    
    try 
    {
        hgt_dir = argv[1];
        lat = std::stod(argv[2]);
        lon = std::stod(argv[3]);   
    } catch (const std::invalid_argument& e) 
    {
        std::cerr << "Error: Invalid latitude or longitude format." << std::endl;
        print_usage();
        return 1;
    } catch (const std::out_of_range& e) 
    {
        std::cerr << "Error: Latitude or longitude value is out of range." << std::endl;
        print_usage();
        return 1;
    }
    
    try 
    {
        ElevationReader reader(hgt_dir);
        double elevation = reader.get_elevation(lat, lon);
        std::cout << "Querying for Latitude=" << lat << ", Longitude=" << lon << std::endl;
        if (elevation == USER_NO_DATA_VALUE) 
        {
            std::cout << "Result: Elevation data not available for this location." << std::endl;
        } 
        else 
        {
            std::cout << "Result: Elevation is " << elevation << " meters." << std::endl;
        }
    } catch (const std::exception& e) 
    {
        std::cerr << "An unexpected error occurred: " << e.what() << std::endl;
        return 1;
    }
    return 0;
}