#include <assert.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "studio/geometry.h"
#include "studio/pdf.h"
#include "studio/random.h"
#include "triangles.h"

static int numeric(const char * const parameter)
{
    if (parameter) {
        char *error = 0;
        const long number = strtol(parameter, &error, 10);
        if (*error == 0 && number >= 0 && number <= INT_MAX)
            return (int)number;
    }
    return -1;
}

int main(const int parameters, const char * const parameter[])
{
    static struct {char *description; function *function;} media[] = {
        {"postcard [number]", postcard},
        {"video [objects]", video}
    };
    const int choice = (parameters >= 2) ? numeric(parameter[1]) : -1;
    if (choice >= 1 && (size_t)choice <= count(media)) {
        const int option = (parameters >= 3) ? numeric(parameter[2]) : -1;
        if (media[choice - 1].function && media[choice - 1].function(stdout, option))
            exit(EXIT_SUCCESS);
    } else {
        (void)fprintf(stderr, "Usage: %s [choice] [parameter]\n", parameter[0]);
        for (size_t number = 0; number < count(media); ++number)
            (void)fprintf(stderr, "    %lu: %s\n", number + 1, media[number].description);
    }
    exit(EXIT_FAILURE);
}

size_t output(void * const file, const char * const format, va_list arguments)
{
    assert(file);
    assert(format);
    const int bytes = vfprintf((FILE *)file, format, arguments);
    if (bytes >= 0)
        return (size_t)bytes;
    else
        abort();
}