<?php

namespace Delight\Db;

/**
 * Description of a data source for use with PHP's built-in PDO
 */
final class PdoDataSource implements DataSource
{
    /** The driver name for MySQL */
    const DRIVER_NAME_MYSQL = 'mysql';

    /** The driver name for PostgreSQL */
    const DRIVER_NAME_POSTGRESQL = 'pgsql';

    /** The driver name for SQLite */
    const DRIVER_NAME_SQLITE = 'sqlite';

    /** The driver name for Oracle */
    const DRIVER_NAME_ORACLE = 'oci';

    /** Hostname for the virtual loopback interface */
    const HOST_LOOPBACK_NAME = 'localhost';

    /** IPv4 address for the virtual loopback interface */
    const HOST_LOOPBACK_IP = '127.0.0.1';

    /** The default hostname */
    const HOST_DEFAULT = self::HOST_LOOPBACK_NAME;

    /** @var string the name of the driver, e.g. `mysql` or `pgsql` */
    private $driverName;

    /** @var string|null the hostname where the database can be accessed, e.g. `db.example.com` */
    private $hostname;

    /** @var int|null the port number to use at the given host, e.g. `3306` or `5432` */
    private $port;

    /** @var string|null the UNIX socket to use, e.g. `/tmp/db.sock` */
    private $unixSocket;

    /** @var bool|null whether to keep the database in memory only */
    private $memory;

    /** @var string|null the path to the file where the database can be accessed on disk, e.g. `/opt/databases/mydb.ext` */
    private $filePath;

    /** @var string|null the name of the database, e.g. `my_application` */
    private $databaseName;

    /** @var string|null the character encoding of the database, e.g. `utf8` */
    private $charset;

    /** @var string|null the name of a user that can access the database */
    private $username;

    /** @var string|null the password corresponding to the username */
    private $password;

    /**
     * Constructor
     *
     * @param string $driverName the name of the driver, e.g. `mysql` or `pgsql`
     */
    public function __construct($driverName)
    {
        $this->driverName = (string) $driverName;
        $this->hostname = self::HOST_DEFAULT;
        $this->port = self::suggestPortFromDriverName($driverName);
        $this->unixSocket = null;
        $this->memory = null;
        $this->filePath = null;
        $this->databaseName = null;
        $this->charset = self::suggestCharsetFromDriverName($driverName);
        $this->username = null;
        $this->password = null;
    }

    /**
     * Sets the hostname
     *
     * @param string|null $hostname the hostname where the database can be accessed, e.g. `db.example.com`
     * @return static this instance for chaining
     */
    public function setHostname($hostname = null)
    {
        $this->hostname = $hostname !== null ? (string) $hostname : null;

        return $this;
    }

    /**
     * Sets the port number
     *
     * @param int|null $port the port number to use at the given host, e.g. `3306` or `5432`
     * @return static this instance for chaining
     */
    public function setPort($port = null)
    {
        $this->port = $port !== null ? (int) $port : null;

        return $this;
    }

    /**
     * Sets the unix socket
     *
     * @param string|null $unixSocket the UNIX socket to use, e.g. `/tmp/db.sock`
     * @return static this instance for chaining
     */
    public function setUnixSocket($unixSocket = null)
    {
        $this->unixSocket = $unixSocket !== null ? (string) $unixSocket : null;

        return $this;
    }

    /**
     * Sets whether to keep the database in memory only
     *
     * @param bool|null $memory whether to keep the database in memory only
     * @return static this instance for chaining
     */
    public function setMemory($memory = null)
    {
        $this->memory = $memory !== null ? (bool) $memory : null;

        return $this;
    }

    /**
     * Sets the file path
     *
     * @param string|null $filePath the path to the file where the database can be accessed on disk, e.g. `/opt/databases/mydb.ext`
     * @return static this instance for chaining
     */
    public function setFilePath($filePath = null)
    {
        $this->filePath = $filePath !== null ? (string) $filePath : null;

        return $this;
    }

    /**
     * Sets the database name
     *
     * @param string|null $databaseName the name of the database, e.g. `my_application`
     * @return static this instance for chaining
     */
    public function setDatabaseName($databaseName = null)
    {
        $this->databaseName = $databaseName !== null ? (string) $databaseName : null;

        return $this;
    }

    /**
     * Sets the charset
     *
     * @param string|null $charset the character encoding, e.g. `utf8`
     * @return static this instance for chaining
     */
    public function setCharset($charset = null)
    {
        $this->charset = $charset !== null ? (string) $charset : null;

        return $this;
    }

    /**
     * Sets the username
     *
     * @param string|null $username the name of a user that can access the database
     * @return static this instance for chaining
     */
    public function setUsername($username = null)
    {
        $this->username = $username;

        return $this;
    }

    /**
     * Sets the password
     *
     * @param string|null $password the password corresponding to the username
     * @return static this instance for chaining
     */
    public function setPassword($password = null)
    {
        $this->password = $password;

        return $this;
    }

    public function toDsn()
    {
        $components = [];

        if (isset($this->hostname)) {
            if ($this->driverName !== self::DRIVER_NAME_ORACLE) {
                $hostname = $this->hostname;

                // if we're trying to connect to a local database
                if ($this->hostname === self::HOST_LOOPBACK_NAME) {
                    // if we're using a non-standard port
                    if (isset($this->port) && $this->port !== self::suggestPortFromDriverName($this->driverName)) {
                        // force usage of TCP over UNIX sockets for the port change to take effect
                        $hostname = self::HOST_LOOPBACK_IP;
                    }
                }

                $components[] = 'host='.$hostname;
            }
        }

        if (isset($this->port)) {
            if ($this->driverName !== self::DRIVER_NAME_ORACLE) {
                $components[] = 'port='.$this->port;
            }
        }

        if (isset($this->unixSocket)) {
            $components[] = 'unix_socket='.$this->unixSocket;
        }

        if (isset($this->memory)) {
            if ($this->memory === true) {
                $components[] = ':memory:';
            }
        }

        if (isset($this->filePath)) {
            $components[] = $this->filePath;
        }

        if (isset($this->databaseName)) {
            if ($this->driverName === self::DRIVER_NAME_ORACLE) {
                $oracleLocation = [];

                if (isset($this->hostname)) {
                    $oracleLocation[] = $this->hostname;
                }
                if (isset($this->port)) {
                    $oracleLocation[] = $this->port;
                }

                if (count($oracleLocation) > 0) {
                    $components[] = 'dbname=//'.implode(':', $oracleLocation).'/'.$this->databaseName;
                }
                else {
                    $components[] = 'dbname='.$this->databaseName;
                }
            }
            else {
                $components[] = 'dbname='.$this->databaseName;
            }
        }

        if (isset($this->charset)) {
            if ($this->driverName === self::DRIVER_NAME_POSTGRESQL) {
                $components[] = 'client_encoding='.$this->charset;
            }
            else {
                $components[] = 'charset='.$this->charset;
            }
        }

        if (isset($this->username)) {
            $components[] = 'user='.$this->username;
        }

        if (isset($this->password)) {
            $components[] = 'password='.$this->password;
        }

        $dsnStr = $this->driverName . ':' . implode(';', $components);

        return new PdoDsn($dsnStr, $this->username, $this->password);
    }

    /**
     * Suggests a default charset for a given driver
     *
     * @param string $driverName the name of the driver
     * @return string|null the suggested charset
     */
    private static function suggestCharsetFromDriverName($driverName)
    {
        switch ($driverName) {
            case self::DRIVER_NAME_MYSQL: return 'utf8mb4';
            case self::DRIVER_NAME_POSTGRESQL: return 'UTF8';
            default: return null;
        }
    }

    /**
     * Suggests a default port number for a given driver
     *
     * @param string $driverName the name of the driver
     * @return int|null the suggested port number
     */
    private static function suggestPortFromDriverName($driverName)
    {
        switch ($driverName) {
            case self::DRIVER_NAME_MYSQL: return 3306;
            case self::DRIVER_NAME_POSTGRESQL: return 5432;
            default: return null;
        }
    }
}
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