#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>
#include <sys/time.h>               /* gettimeofday() */
#include <string>
#include <map>
#include "Scene.h"
using namespace std;

void usage(const char * progname)
{
    cout << "Usage: " << progname << " [options] <scene-file>" << endl;
    cout << "  Options:" << endl;
    cout << "    -o|--output-file <output-file-name>" << endl;
    cout << "    -w|--width <image-width>" << endl;
    cout << "    -h|--height <image-height>" << endl;
    cout << "    -m|--multisample <level>" << endl;
    cout << "    -f|--field-of-view <vertical-fov>" << endl;
    cout << "    -v|--verbose" << endl;
    exit(42);
}

int main(int argc, char * argv[])
{
    int opt;
    int option_index;
    map<string, const char *> scene_options;

    static const struct option long_options[] = {
        { "help",           no_argument,       NULL, 256 },
        { "output-file",    required_argument, NULL, 'o' },
        { "width",          required_argument, NULL, 'w' },
        { "height",         required_argument, NULL, 'h' },
        { "multisample",    required_argument, NULL, 'm' },
        { "field-of-view",  required_argument, NULL, 'f' },
        { "verbose",        no_argument,       NULL, 'v' },
        { NULL,             0,                 NULL, 0   }
    };

    while ((opt = getopt_long(argc, argv, "o:w:h:m:f:v",
                              long_options, &option_index)) != -1)
    {
        switch (opt)
        {
            case 256:
                usage(argv[0]);
                break;
            case 'o':
                scene_options["output-file"] = optarg;
                break;
            case 'w':
                scene_options["width"] = optarg;
                break;
            case 'h':
                scene_options["height"] = optarg;
                break;
            case 'm':
                scene_options["multisample"] = optarg;
                break;
            case 'f':
                scene_options["field-of-view"] = optarg;
                break;
            case 'v':
                scene_options["verbose"] = optarg;
                break;
            default:
                usage(argv[0]);
        }
    }

    if (optind >= argc)
    {
        usage(argv[0]);
    }

    Scene scene(scene_options, argv[optind]);

    struct timeval before, after;
    gettimeofday(&before, NULL);        /* start timing */

    scene.render();

    gettimeofday(&after, NULL);         /* stop timing */

    double time_before = before.tv_sec + before.tv_usec / 1000000.0;
    double time_after = after.tv_sec + after.tv_usec / 1000000.0;
    double diff = time_after - time_before;
    cout << "Elapsed time: " << diff << " seconds." << endl;

    return 0;
}