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<?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){
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//retourne la position du caractere a remplacer dans la ligne pour gagner
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if (strpos("+".$myChar.$myChar.$myChar,$line) !== false ){
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return strpos("+".$myChar.$myChar.$myChar,$line);
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}
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if (strpos($myChar.$myChar.$myChar."+",$line) !== false ){
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return strpos($myChar.$myChar.$myChar."+",$line) + 3;
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}
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return false;
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}
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function can_loose($line,$hisChar){
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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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if (strpos("+".$hisChar.$hisChar.$hisChar,$line) !== false ){
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return strpos("+".$hisChar.$hisChar.$hisChar,$line);
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}
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if (strpos($hisChar.$hisChar.$hisChar."+",$line) !== false ){
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return strpos($hisChar.$hisChar.$hisChar."+",$line) + 3;
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}
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if (strpos("+".$hisChar.$hisChar."+",$line) !== false ){
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return strpos("+".$hisChar.$hisChar."+",$line);
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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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$params['board'][$y][$x] = "+";
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}
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}
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}
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if((!isset($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][$x];
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}
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if(can_win($colStr,$params['you']) !== false){
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echo '{"play":'.$x.'}';
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die;
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}
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if (can_loose($colStr,$opponent) !== false){
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$colForNoLose = $x;
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}
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}
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//horizontales
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for($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][$x];
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}
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if(can_win($lnStr,$params['you']) !== false){
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echo '{"play":'.can_win($lnStr,$params['you']).'}';
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die;
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}
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if (can_loose($lnStr,$opponent) !== false){
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$colForNoLose = can_loose($lnStr,$opponent);
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}
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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][$x];
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}
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if(can_win($diagStr,$params['you']) !== false){
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echo '{"play":'.$x.'}';
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die;
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}
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if (can_loose($diagStr,$opponent) !== false){
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$colForNoLose = $x;
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}
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//diagonale \
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$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][$x];
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}
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if(can_win($diagStr,$params['you']) !== false){
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echo '{"play":'.$x.'}';
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die;
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}
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if (can_loose($diagStr,$opponent) !== false){
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$colForNoLose = $x;
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}
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}
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for ($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][$x];
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}
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if(can_win($diagStr,$params['you']) !== false){
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echo '{"play":'.$x.'}';
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die;
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}
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if (can_loose($diagStr,$opponent) !== false){
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$colForNoLose = $x;
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}
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}
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for ($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][$x];
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}
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if(can_win($diagStr,$params['you']) !== false){
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echo '{"play":'.$x.'}';
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die;
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}
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if (can_loose($diagStr,$opponent) !== false){
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$colForNoLose = $x;
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}
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}
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//si j'arrive là, je ne gagne pas à ce tour
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if(isset($colForNoLose)){
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echo '{"play":'.$colForNoLose.'}';
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die;
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}
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//still there? random
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$colAvailable=array();
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//dont play on full colomns
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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[]=$i;
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}
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}
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shuffle($colAvailable);
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echo '{"play":'.$colAvailable[0].'}';
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//echo '{"play":"'.better_col($params['board'],$params['you'],$opponent,0).'"}';
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break;
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default:
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break;
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}
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