#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <stdbool.h>
#include <assert.h> 
#include <string.h>
#include <unistd.h>
#include "utictactoe.h"

#define OPTIONAL_ARGUMENT_IS_PRESENT \
     ((optarg == NULL && optind < argc && argv[optind][0] != '-') \
     ? (bool) (optarg = argv[optind++]) \
     : (optarg != NULL))

void help(){
    printf("Usage: utictactoe ([-i LEVEL|-x N|-o N|-v|-V|-h] | -c FILE)\n");
    printf("Play a utictactoe game with human or program players.\n");
    printf("-i, --inception-level LEVEL deepness of the game (min=1, max=3 (default=2))\n");
    printf("-x, --cross-ai N set tactic of cross player 'X'\n");
    printf("-o, --round-ai N set tactic of round player 'O'\n");
    printf("-c, --contest enable 'contest' mode\n");
    printf("-v, --verbose verbose output\n");
    printf("-V, --version display version and exit\n");
    printf("-h, --help display this help and exit\n");
    printf("Tactics list: random (0), clever (1)\n");
}

int check_int_value ( char *value, int min, int max){
    char * end_ptr;
    int result;
    result = strtol(optarg, &end_ptr, 10);
    if ( strcmp(end_ptr, "\0") != 0 ) {
        return -1;
    }
    if ( result < min || result > max) {
        return -1;
    }
    return result;
}

int main(int argc, char* argv[]) {
    int optc;
    int cross_ai, round_ai = 0;
    int inception_level = 0;
    bool verbose, contest_mode = false;
    char * contest_file;
    static struct option long_opts[] =
        {
          {"inception-level",   optional_argument,  0, 'i'},
          {"cross-ai",          required_argument,  0, 'x'},
          {"round-ai",          required_argument,  0, 'o'},
          {"contest",           required_argument,  0, 'c'},
          {"verbose",           no_argument,        0, 'v'},
          {"version",           no_argument,        0, 'V'},
          {"help",              no_argument,        0, 'h'},
          {0, 0, 0, 0}
        };

    while ((optc = getopt_long (argc, argv, "i::x:o:c:vVh", long_opts, NULL)) != -1){
        switch (optc) {
        case 'i': /* 'a' option */
            if ( OPTIONAL_ARGUMENT_IS_PRESENT ) {
                inception_level = check_int_value( optarg, 1, 3);
                if ( inception_level == -1 ) {
                    fprintf(stderr, "Error: incorrect inception level\n");
                    exit (EXIT_FAILURE);
                }
            }
            else {
                inception_level = 2;
            }  
            printf ("Inception activated, level: %d\n", inception_level);
            break;
        case 'x':
            printf ("cross ai\n");
            if ( optarg ) {
                cross_ai = check_int_value(optarg, 0, 1);
                if ( cross_ai == -1 ) {
                    fprintf(stderr, "Error: incorrect cross ai value\n");
                    exit (EXIT_FAILURE);
                }
            }
            else {
                fprintf(stderr, "Error: you must specify a value for cross ai\n");
                exit (EXIT_FAILURE);
            }

            break;

        case 'o':
            printf ("round ai\n");
            if ( optarg ) {
                round_ai = check_int_value(optarg, 0, 1);
                if ( round_ai == -1 ) {
                    fprintf(stderr, "Error: incorrect round ai value\n");
                    exit (EXIT_FAILURE);
                }
            }
            else {
                fprintf(stderr, "Error: you must specify a value for round ai\n");
                exit (EXIT_FAILURE);
            }
            break;

        case 'c':
            if ( OPTIONAL_ARGUMENT_IS_PRESENT ) {
                if ( access(optarg, R_OK) == 0) {
                    printf("Contest file valid\n");
                }
                else {
                    fprintf(stderr, "Can't access to file %s\n", optarg);
                }   exit (EXIT_FAILURE);
            }
            else {
                fprintf(stderr, "Error: contest need a file\n");
                exit (EXIT_FAILURE);
            }
            contest_mode = true;
            printf ("contest activated\n");
            break;

        case 'v':
            verbose = true;
            break;

        case 'V':
            printf("utictactoe %d.%d.%d\n", VERSION, SUBVERSION, REVISION);
            printf("This software implements a full ultimate tictactoe game.\n");
            exit(EXIT_SUCCESS);
    
       
        case 'h':
            help();
            exit(EXIT_SUCCESS);
        default:
            fprintf(stderr, "Try `utictactie --help' for more information.\n");
            exit (EXIT_FAILURE);
        }
    }
    printf("Hello World!\n");
    return EXIT_SUCCESS;
}