Add poll system for Patrons Circle

lib/Vote.php

@@ -0,0 +1,87 @@
+<?
+use Safe\DateTime;
+
+class Vote extends PropertiesBase{
+	public $VoteId;
+	public $UserId;
+	protected $User = null;
+	public $Created;
+	public $PollItemId;
+	protected $PollItem = null;
+	protected $Url = null;
+
+	protected function GetUrl(): string{
+		if($this->Url === null){
+			$this->Url = '/patrons-circle/polls/' . $this->PollItem->Poll->Url . '/votes/' . $this->UserId;
+		}
+
+		return $this->Url;
+	}
+
+	protected function Validate(): void{
+		$error = new Exceptions\ValidationException();
+
+		if($this->UserId === null){
+			$error->Add(new Exceptions\InvalidPatronException());
+		}
+
+		if($this->PollItemId === null){
+			$error->Add(new Exceptions\PollItemRequiredException());
+		}
+		else{
+			$this->__get('PollItem');
+			if($this->PollItem === null){
+				$error->Add(new Exceptions\InvalidPollException());
+			}
+		}
+
+		if(!$this->PollItem->Poll->IsActive()){
+			$error->Add(new Exceptions\PollClosedException());
+		}
+
+		if(!$error->HasExceptions){
+			// Basic sanity checks done, now check if we've already voted
+			// in this poll
+
+			$this->__get('User');
+			if($this->User === null){
+				$error->Add(new Exceptions\InvalidPatronException());
+			}
+			else{
+				// Do we already have a vote for this poll, from this user?
+				if( (Db::Query('
+					SELECT count(*) as VoteCount from Votes v inner join
+					(select PollItemId from PollItems pi inner join Polls p on pi.PollId = p.PollId) x
+					on v.PollItemId = x.PollItemId where v.UserId = ?', [$this->UserId]))[0]->VoteCount > 0){
+					$error->Add(new Exceptions\VoteExistsException());
+				}
+			}
+		}
+
+		if($error->HasExceptions){
+			throw $error;
+		}
+	}
+
+	public function Create(?string $email = null): void{
+		if($email !== null){
+			try{
+				$patron = Patron::GetByEmail($email);
+				$this->UserId = $patron->UserId;
+				$this->User = $patron->User;
+			}
+			catch(Exceptions\InvalidPatronException $ex){
+				// Can't validate patron email - do nothing for now,
+				// this will be caught later when we validate the vote during creation.
+				// Save the email in the User object in case we want it later,
+				// for example prefilling the 'create' form after an error is returned.
+				$this->User = new User();
+				$this->User->Email = $email;
+			}
+		}
+
+		$this->Validate();
+		$this->Created = new DateTime();
+		Db::Query('INSERT into Votes (UserId, PollItemId, Created) values (?, ?, ?)', [$this->UserId, $this->PollItemId, $this->Created]);
+	}
+}