/**
* Get the response based on previous player responses
* @param ResponseEnum $partnerPreviousResponse
* @param ResponseEnum $playerPreviousResponse
* @return $this|ResponseEnum
*/
public function getResponse(ResponseEnum $partnerPreviousResponse = null, ResponseEnum $playerPreviousResponse = null)
{
// if there was not a previous response, default to cooperation
if (null === $partnerPreviousResponse) {
return ResponseEnum::create(ResponseEnum::COOPERATE);
}
// if both players cooperated, cooperate
if ($partnerPreviousResponse->cooperated() && $playerPreviousResponse->cooperated()) {
return ResponseEnum::create(ResponseEnum::COOPERATE);
}
// if I exploited opponent, cooperate
if ($partnerPreviousResponse->cooperated() && $playerPreviousResponse->confessed()) {
return ResponseEnum::create(ResponseEnum::COOPERATE);
}
// if opponent exploited me, small change to cooperate
if ($partnerPreviousResponse->confessed() && $playerPreviousResponse->cooperated()) {
return $this->getResponseByChanceToCooperate(function ($coefficient) {
return ($coefficient - 1) / (3 * $coefficient + 2);
});
}
// if both players confessed, small chance to cooperate
return $this->getResponseByChanceToCooperate(function ($coefficient) {
return 2 * ($coefficient - 1) / (3 * $coefficient + 2);
});
}
