<?php
namespace Common\Alias;

use Common\Concept\Database as DatabaseInterface;

abstract class Database implements DatabaseInterface
{
    protected string $host;
    protected int $port;
    public function setHost(string $host, ?int $port = null): DatabaseInterface
    {
        $this->host = $host;
        if ($port !== null) {
            $this->port = $port;
        }
        return $this;
    }
    public function getHost(): string
    {
        return $this->host;
    }
    public function getPort(): int
    {
        return $this->port;
    }
    protected string $name;
    public function setName(string $database_name): Database
    {
        $this->name = $database_name;
        return $this;
    }
    public function getName(): string
    {
        return $this->name;
    }
    protected string $username;
    protected string $password;
    public function setUser(string $username, string $password): Database
    {
        $this->username = $username;
        $this->password = $password;
        return $this;
    }
    public function getUser(): string
    {
        return $this->username;
    }
    public function getPassword(): string
    {
        return $this->password;
    }

    protected \PDO $connection;
    public function connect(): Database
    {
        if ($this->needsUser()) {
            $this->connection = new \PDO($this->getDsn(), $this->getUser(), $this->getPassword());
            return $this;
        }
        $this->connection = new \PDO($this->getDsn());
        return $this;
    }
    public function getConnection(): \PDO
    {
        if (!isset($this->connection)) {
            return $this->connect()->connection;
        }
        return $this->connection;
    }
    public function query(string $query): array
    {
        $st = $this->getConnection()->query($query);
        if (!$st) {
            throw new \PDOException("Could not retrieve anything with '{$query}'.");
        }
        $results = $st->fetchAll(\PDO::FETCH_ASSOC);
        if (!$results) {
            throw new \PDOException('Could not retrieve any results.');
        }
        return $results;
    }
    public function beginTransaction(): void
    {
        if (!$this->getConnection()->beginTransaction()) {
            throw new \PDOException('Could not begin transaction.');
        }
    }
    public function commit(): void
    {
        if (!$this->getConnection()->commit()) {
            throw new \PDOException('Could not commit');
        }
    }
    public function rollBack(): void
    {
        if (!$this->getConnection()->rollBack()) {
            throw new \PDOException('Could not rollback.');
        }
    }
    protected \PDOStatement $prepared_statement;
    public function prepare(string $query): Database
    {
        $st = $this->getConnection()->prepare($query);
        if (!$st) {
            throw new \PDOException("Could not prepare query '{$query}'.");
        }
        $this->prepared_statement = $st;
        return $this;
    }
    public function execute(array $data): array
    {
        if (!isset($this->prepared_statement)) {
            throw new \Exception('No prepared statement.');
        }
        if (!$this->prepared_statement->execute($data)) {
            throw new \PDOException('Could not execute prepared statement.');
        }
        $results = $this->prepared_statement->fetchAll(\PDO::FETCH_ASSOC);
        if (!$results) {
            throw new \PDOException('Could not retrieve any results.');
        }
        return $results;
    }
    public function insert(array $values): void
    {
        if (!isset($this->prepared_statement)) {
            throw new \Exception('No prepared statement.');
        }
        if (!$this->prepared_statement->execute($values)) {
            throw new \PDOException('Could not insert.');
        }
    }
    public function update(array $data): void
    {
        if (!isset($this->prepared_statement)) {
            throw new \Exception('No prepared statement.');
        }
        if (!$this->prepared_statement->execute($data)) {
            throw new \PDOException('Could not update.');
        }
    }
    public function delete(array $data): void
    {
        if (!isset($this->prepared_statement)) {
            throw new \Exception('No prepared statement.');
        }
        if (!$this->prepared_statement->execute($data)) {
            throw new \PDOException('Could not delete.');
        }
    }
}