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<?php

namespace Doctrine\DBAL\Driver\PgSQL;

use Doctrine\DBAL\Driver\PgSQL\Exception\UnknownParameter;

use Doctrine\DBAL\Driver\Statement as StatementInterface;

use Doctrine\DBAL\ParameterType;

use Doctrine\Deprecations\Deprecation;

use PgSql\Connection as PgSqlConnection;

use TypeError;

use function assert;

use function func_num_args;

use function get_class;

use function gettype;

use function is_int;

use function is_object;

use function is_resource;

use function ksort;

use function pg_escape_bytea;

use function pg_escape_identifier;

use function pg_get_result;

use function pg_last_error;

use function pg_query;

use function pg_result_error;

use function pg_send_execute;

use function sprintf;

use function stream_get_contents;

final class Statement implements StatementInterface

{

    /** @var PgSqlConnection|resource */

    private $connection;

    private string $name;

    /** @var array<array-key, int> */

    private array $parameterMap;

    /** @var array<int, mixed> */

    private array $parameters = [];

    /** @psalm-var array<int, int> */

    private array $parameterTypes = [];

    /**

     * @param PgSqlConnection|resource $connection

     * @param array<array-key, int>    $parameterMap

     */

    public function __construct($connection, string $name, array $parameterMap)

    {

        if (! is_resource($connection) && ! $connection instanceof PgSqlConnection) {

            throw new TypeError(sprintf(

                'Expected connection to be a resource or an instance of %s, got %s.',

                PgSqlConnection::class,

                is_object($connection) ? get_class($connection) : gettype($connection),

            ));

        }

        $this->connection   = $connection;

        $this->name         = $name;

        $this->parameterMap = $parameterMap;

    }

    public function __destruct()

    {

        if (! isset($this->connection)) {

            return;

        }

        @pg_query(

            $this->connection,

            'DEALLOCATE ' . pg_escape_identifier($this->connection, $this->name),

        );

    }

    /** {@inheritdoc} */

    public function bindValue($param, $value, $type = ParameterType::STRING): bool

    {

        if (! isset($this->parameterMap[$param])) {

            throw UnknownParameter::new((string) $param);

        }

        $this->parameters[$this->parameterMap[$param]]     = $value;

        $this->parameterTypes[$this->parameterMap[$param]] = $type;

        return true;

    }

    /** {@inheritdoc} */

    public function bindParam($param, &$variable, $type = ParameterType::STRING, $length = null): bool

    {

        Deprecation::trigger(

            'doctrine/dbal',

            'https://github.com/doctrine/dbal/pull/5563',

            '%s is deprecated. Use bindValue() instead.',

            __METHOD__,

        );

        if (func_num_args() < 3) {

            Deprecation::trigger(

                'doctrine/dbal',

                'https://github.com/doctrine/dbal/pull/5558',

                'Not passing $type to Statement::bindParam() is deprecated.'

                . ' Pass the type corresponding to the parameter being bound.',

            );

        }

        if (func_num_args() > 4) {

            Deprecation::triggerIfCalledFromOutside(

                'doctrine/dbal',

                'https://github.com/doctrine/dbal/issues/4533',

                'The $driverOptions argument of Statement::bindParam() is deprecated.',

            );

        }

        if (! isset($this->parameterMap[$param])) {

            throw UnknownParameter::new((string) $param);

        }

        $this->parameters[$this->parameterMap[$param]]     = &$variable;

        $this->parameterTypes[$this->parameterMap[$param]] = $type;

        return true;

    }

    /** {@inheritdoc} */

    public function execute($params = null): Result

    {

        if ($params !== null) {

            Deprecation::trigger(

                'doctrine/dbal',

                'https://github.com/doctrine/dbal/pull/5556',

                'Passing $params to Statement::execute() is deprecated. Bind parameters using'

                . ' Statement::bindParam() or Statement::bindValue() instead.',

            );

            foreach ($params as $param => $value) {

                if (is_int($param)) {

                    $this->bindValue($param + 1, $value, ParameterType::STRING);

                } else {

                    $this->bindValue($param, $value, ParameterType::STRING);

                }

            }

        }

        ksort($this->parameters);

        $escapedParameters = [];

        foreach ($this->parameters as $parameter => $value) {

            switch ($this->parameterTypes[$parameter]) {

                case ParameterType::BINARY:

                case ParameterType::LARGE_OBJECT:

                    $escapedParameters[] = $value === null ? null : pg_escape_bytea(

                        $this->connection,

                        is_resource($value) ? stream_get_contents($value) : $value,

                    );

                    break;

                default:

                    $escapedParameters[] = $value;

            }

        }

        if (@pg_send_execute($this->connection, $this->name, $escapedParameters) !== true) {

            throw new Exception(pg_last_error($this->connection));

        }

        $result = @pg_get_result($this->connection);

        assert($result !== false);

        if ((bool) pg_result_error($result)) {

            throw Exception::fromResult($result);

        }

        return new Result($result);

    }

}