404 lines
13 KiB
PHP
404 lines
13 KiB
PHP
<?php
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/*
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Bot for connectfour https://botsarena.tinad.fr/connectFour
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by Gnieark https://blog-du-grouik.tinad.fr/ june 2016
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GNU GPL License
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+--+--+--+--+--+--+--+
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5 | | | | | | | |
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+--+--+--+--+--+--+--+
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4 | | | | | | | |
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+--+--+--+--+--+--+--+
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3 | | | | | | | |
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+--+--+--+--+--+--+--+
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2 | | | | | | | |
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+--+--+--+--+--+--+--+
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1 | | | | | | | |
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+--+--+--+--+--+--+--+
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0 | | | | | | | |
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+--+--+--+--+--+--+--+
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0 1 2 3 4 5 6
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*/
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET, POST');
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header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');
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function can_win($line,$myChar,$depth=0){
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//retourne la position du caractere a remplacer dans la ligne pour gagner
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$arr=array();
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if($depth == 0){
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if (strpos($line,"+".$myChar.$myChar.$myChar) !== false ){
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$arr[] = strpos($line,"+".$myChar.$myChar.$myChar);
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}
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if (strpos($line,$myChar."+".$myChar.$myChar) !== false ){
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$arr[] = strpos($line,$myChar."+".$myChar.$myChar) + 1;
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}
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if (strpos($line,$myChar.$myChar."+".$myChar) !== false ){
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$arr[] = strpos($line,$myChar.$myChar."+".$myChar) + 2;
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}
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if (strpos($line,$myChar.$myChar.$myChar."+") !== false ){
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$arr[] = strpos($line,$myChar.$myChar.$myChar."+") + 3;
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}
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}else{
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if (strpos($line,"+".$myChar.$myChar."+") !== false ){
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$arr[] = strpos($line,"+".$myChar.$myChar."+");
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$arr[] = strpos($line,"+".$myChar.$myChar."+") + 3;
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}
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if (strpos($line,"+".$myChar."+".$myChar) !== false ){
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$arr[] = strpos($line,"+".$myChar."+".$myChar);
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$arr[] = strpos($line,"+".$myChar."+".$myChar) + 2;
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}
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if (strpos($line,$myChar."+".$myChar."+") !== false ){
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$arr[] = strpos($line,$myChar."+".$myChar."+") + 1;
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$arr[] = strpos($line,$myChar."+".$myChar."+") + 3;
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}
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}
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return $arr;
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}
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function can_loose($line,$hisChar,$depth=0){
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//je pourrai perdre aux 2 prochains tours de jeu
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// retourne la place du caractere à remplacer pour éviter ça
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$arr=array();
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if ($depth == 0){
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if (strpos($line,"+".$hisChar.$hisChar.$hisChar) !== false ){
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$arr[] = strpos($line,"+".$hisChar.$hisChar.$hisChar);
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}
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if (strpos($line,$hisChar."+".$hisChar.$hisChar) !== false ){
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$arr[] = strpos($line,$hisChar."+".$hisChar.$hisChar) + 1;
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}
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if (strpos($line,$hisChar.$hisChar."+".$hisChar) !== false ){
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$arr[] = strpos($line,$hisChar.$hisChar."+".$hisChar) + 2;
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}
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if (strpos($line,$hisChar.$hisChar.$hisChar."+") !== false ){
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$arr[] = strpos($line,$hisChar.$hisChar.$hisChar."+") + 3;
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}
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}else{
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if (strpos($line,"+".$hisChar.$hisChar."+") !== false ){
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$arr[] = strpos($line,"+".$hisChar.$hisChar."+");
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$arr[] = strpos($line,"+".$hisChar.$hisChar."+") +3;
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}
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if(strpos($line,"+".$hisChar."+".$hisChar."+") !== false ){
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$arr[] = strpos($line,"+".$hisChar."+".$hisChar."+");
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$arr[] = strpos($line,"+".$hisChar."+".$hisChar."+") + 2;
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$arr[] = strpos($line,"+".$hisChar."+".$hisChar."+") + 4;
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}
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}
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return $arr;
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}
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function array_merge_and_increment_rigth ($arr1,$arr2,$incr){
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foreach($arr2 as $v){
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$arr1[] = $v + $incr;
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}
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return $arr1;
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}
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function analize($line,$me,$opponent,$isVertical,$decalageX){
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/*
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* Etudie les lignes fournies
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* Joue si une case est gagnante
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* Sinon, "peuple" des variables
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* qui permettront de prendre une décision
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*/
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static $colForNoLose = array();
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static $colForNoLose1 = array();
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static $canWinDepth1 = array();
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if(count(can_win($line,$me,0)) > 0){
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if($isVertical){
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echo '{"play":'.$decalageX.'}';
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}else{
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echo '{"play":'.(can_win($line,$me,0)[0] + $decalageX).'}';
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}
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die;
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}
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if (count(can_loose($line,$opponent,0)) > 0){
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if($isVertical){
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$colForNoLose[] = $decalageX;
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}else{
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$colForNoLose = array_merge_and_increment_rigth($colForNoLose ,can_loose($line,$opponent,0),$decalageX);
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}
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}
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if (count(can_loose($line,$opponent,1)) > 0 ){
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if($isVertical){
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$colForNoLose1[] = $decalageX;
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}else{
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$colForNoLose1 = array_merge_and_increment_rigth($colForNoLose1 ,can_loose($line,$opponent,1),$decalageX);
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}
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}
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if(count(can_win($line,$opponent,1)) > 0){
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if($isVertical){
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$canWinDepth1[] = $decalageX;
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}else{
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$canWinDepth1= array_merge_and_increment_rigth($canWinDepth1, can_win($line,$me,1), $decalageX);
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}
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}
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return array(
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'colForNoLose' => $colForNoLose,
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'colForNoLose1' => $colForNoLose1,
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'canWinDepth1' => $canWinDepth1
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);
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}
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function should_opponent_win_if_i_play_at($map,$me,$opponent,$colToPlay){
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//j'ouvre l'a possibilité à l'adversaire de jouer au dessus de mon pion
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// est-ce une connerie?
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if(($map[4][$colToPlay] == $me) OR ($map[4][$colToPlay] == $opponent)){
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//top of the grid
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return false;
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}
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for($y = 0; (($map[$y][$colToPlay] <> "+") && ($map[$y][$colToPlay] <> "-")); $y++){
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}
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$map[$y][$colToPlay] = $me;
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$map[$y +1][$colToPlay] = "$opponent";
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$y++;
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if(isset($map[$y +1][$colToPlay])){
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$map[$y +1][$colToPlay] = "+";
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}
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//tester les lignes qui passent pas $y+1,$colToPlay
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$loseStr = $opponent.$opponent.$opponent.$opponent;
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//horizontale
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$line="";
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for($x=0; $x < 7; $x++){
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$line.=$map[$y][$x];
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}
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if(strpos($line,$loseStr) !== false){
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return true;
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}
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//diagonal /
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$line="";
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if($colToPlay > $y){
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$kx=$colToPlay - $y;
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$ky = 0;
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}else{
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$kx = 0;
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$ky = $y - $colToPlay;
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}
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while(isset($map[$ky][$kx])){
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$line.=$map[$ky][$kx];
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$kx++;
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$ky++;
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}
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if(strpos($line,$loseStr) !== false){
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return true;
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}
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//diagional \
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$line = "";
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$kx = $colToPlay;
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$ky = $y;
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while(isset($map[$ky -1][$kx +1])){
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$kx++;
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$ky--;
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}
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while(isset($map[$ky][$kx])){
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$line.=$map[$ky][$kx];
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$kx--;
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$ky++;
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}
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if(strpos($line,$loseStr) !== false){
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return true;
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}
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return false;
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}
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//replace "" by " ", it will simplify my code.
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$in=str_replace('""','"-"',file_get_contents('php://input'));
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$params=json_decode($in, TRUE);
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switch($params['action']){
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case "init":
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echo '{"name":"Gnieark"}';
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break;
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case "play-turn":
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//find $opponent and clean grid
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for($x = 0; $x < 7 ; $x++){
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for($y = 0; $y < 6 ; $y++){
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//find opponent
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if(($params['board'][$y][$x] <> "-" ) && ($params['board'][$y][$x] <> $params['you'] )){
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$opponent= $params['board'][$y][$x];
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}
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//tester si la case est jouable (s'il y a un support en dessous)
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if ($params['board'][$y][$x] == "-" ){
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//AND (($y==0) OR ($params['board'][$y - 1][$x] !== "-"))
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//){
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//la case est jouable, je la marque par un "+"
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if($y == 0){
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$params['board'][$y][$x] = "+";
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}elseif(($params['board'][$y -1 ][$x] !== "-") AND ($params['board'][$y -1 ][$x] !== "+")){
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$params['board'][$y][$x] = "+";
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}else{}
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}
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}
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}
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if((!isset($opponent)) && ($params['you'] == "X")){
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$opponent="O";
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}elseif(!isset($opponent)){
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$opponent="X";
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}
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//transformer la grille en lignes horizontales, verticales et diagonales
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//verticales
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for($x = 0; $x <7; $x ++){
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$colStr="";
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for($y = 0; $y <6; $y ++){
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$colStr.= $params['board'][$y][$x];
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}
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$choice = analize($colStr,$params['you'],$opponent,true,$x);
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}
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//horizontales
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for($y = 0; $y <6; $y ++){
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$lnStr="";
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for($x = 0; $x <7; $x ++){
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$lnStr.= $params['board'][$y][$x];
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}
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$choice = analize($lnStr,$params['you'],$opponent,false,0);
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}
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//tester seulement les diagonales >= 4 cases
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for ($k = 0; $k < 4; $k ++){
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//diagonale /
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$diagStr="";
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for($x=$k , $y=0; isset($params['board'][$y][$x]); $x++, $y++){
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$diagStr.=$params['board'][$y][$x];
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}
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$choice = analize($diagStr,$params['you'],$opponent,false,$k);
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//diagonale \
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$diagStr="";
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for($x=$k , $y=5; isset($params['board'][$y][$x]); $x++, $y--){
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$diagStr.=$params['board'][$y][$x];
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}
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$choice = analize($diagStr,$params['you'],$opponent,false,$k);
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}
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for ($k = 0; $k < 3; $k ++){
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//diagonale /
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$diagStr="";
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for($x = 0, $y = $k ; isset($params['board'][$y][$x]); $x++, $y++){
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$diagStr.=$params['board'][$y][$x];
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}
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$choice = analize($diagStr,$params['you'],$opponent,false,0);
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}
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for ($k = 3 ; $k < 6 ; $k++){
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//diagonales \
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$diagStr="";
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for($x=0 , $y=$k; isset($params['board'][$y][$x]); $x++, $y--){
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$diagStr.=$params['board'][$y][$x];
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}
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$choice = analize($diagStr,$params['you'],$opponent,false,0);
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}
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//print_r($choice);
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//si j'arrive là, je ne gagne pas à ce tour
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//liste des cases possible moins celles à éviter
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$colAvailable=array();
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for($i=0;$i<7;$i++){
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if((($params['board'][5][$i] == "+") OR ($params['board'][5][$i] == "-"))
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AND (!should_opponent_win_if_i_play_at($params['board'],$params['you'],$opponent,$i)))
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{
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$colAvailable[]=$i;
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}
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}
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if(count($colAvailable) == 0){
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//on risque de perdre au prochain tour
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for($i=0;$i<7;$i++){
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if(($params['board'][5][$i] == "+") OR ($params['board'][5][$i] == "-")){
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$colAvailable[]=$i;
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}
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}
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}
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if(count($choice['colForNoLose']) > 0){
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//intersection entre $choice['colForNoLose'] et $colAvailable
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$intersection = array_intersect($choice['colForNoLose'],$colAvailable);
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if(count($intersection) > 0){
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shuffle($intersection);
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echo '{"play":'.$intersection[0].'}';
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die;
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}else{
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//on pourra perdre au prochain tour, tant pis
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shuffle($choice['colForNoLose']);
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echo '{"play":'.$choice['colForNoLose'][0].'}';
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die;
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}
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}
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$colForNoLose1 = array_unique($choice['colForNoLose1']);
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$canWinDepth1 = array_unique($choice['canWinDepth1']);
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$intersection = array_intersect($colForNoLose1,$colAvailable,$canWinDepth1);
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if(count($intersection) > 0){
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shuffle($intersection);
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echo '{"play":'.$intersection[0].'}';
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die;
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}
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$intersection = array_intersect($colForNoLose1,$colAvailable);
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if(count($intersection) > 0){
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shuffle($intersection);
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echo '{"play":'.$intersection[0].'}';
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die;
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}
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$intersection = array_intersect($colForNoLose1,$canWinDepth1);
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if(count($intersection) > 0){
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shuffle($intersection);
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echo '{"play":'.$intersection[0].'}';
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die;
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}
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//still there? random
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shuffle($colAvailable);
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echo '{"play":'.$colAvailable[0].'}';
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break;
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default:
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break;
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}
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