<?php

namespace Ulmus\Common;

use PDO,
    PDOStatement;

class PdoObject extends PDO {
    
    public static ? string $dump = null;

    public bool $executionStatus;

    public int $rowCount = 0;

    public mixed $lastInsertId = null;

    public \Closure $onClose;

    public function select(string $sql, array $parameters = []): PDOStatement
    {
        static::$dump && call_user_func_array(static::$dump, [ $sql, $parameters ]);

        try {
            if (false !== ( $statement = $this->prepare($sql) )) {
                $statement->setFetchMode(\PDO::FETCH_ASSOC);
                $this->execute($statement, $parameters, false);

                return $statement;
            }
        } 
        catch (\Throwable $e) {
            throw new \PdoException($e->getMessage() . " `$sql` with data:" . json_encode($parameters));
        }
    }

    public function __destruct()
    {
        if ($this->onClose ?? null) {
            call_user_func($this->onClose, $this);
        }
    }

    public function runQuery(string $sql, array $parameters = []): ? static
    {
        static::$dump && call_user_func_array(static::$dump, [ $sql, $parameters ]);

        try {
            if (false !== ( $statement = $this->prepare($sql) )) {
                return $this->execute($statement, $parameters, true);
            }
        } 
        catch (\Throwable $e) {
            throw new \PdoException($e->getMessage() . " `$sql` with data:" . json_encode($parameters));
        }
        
        return null;
    }

    public function runInsertQuery(string $sql, array $parameters = []) : ? static
    {
        return $this->runQuery($sql, $parameters);
    }

    public function runUpdateQuery(string $sql, array $parameters = []) : ? static
    {
        return $this->runQuery($sql, $parameters);
    }

    public function runDeleteQuery(string $sql, array $parameters = []) : ? static
    {
        return $this->runQuery($sql, $parameters);
    }

    public function execute(PDOStatement $statement, array $parameters = [], bool $commit = true) : ? static
    {
        $this->executionStatus = false;
        $this->lastInsertId = null;

        try {
            if ( ! $this->inTransaction() ) {
                $this->beginTransaction();
            }

            $this->bindVariables($statement, $parameters);

            $this->executionStatus = $statement->execute();

            if ( $this->executionStatus  ) {
                $this->lastInsertId = $this->lastInsertId();
                $this->rowCount = $statement->rowCount();

                if ( $commit ) {
                    $this->commit();
                }

                return $this;
            }
            else {
                throw new \PDOException($statement->errorCode() . " - " . json_encode($statement->errorInfo()));
            }
        }
        catch (\PDOException $e) {
            $this->rollback();

            throw $e;
        }
        catch (\Throwable $e) {
            throw $e;
        }

        return null;
    }

    protected function bindVariables(PDOStatement $statement, array &$parameters) : void
    {
        if ($parameters) {
            if (array_is_list($parameters)) {
                $parameters = array_combine(range(1, count($parameters)), array_values($parameters));
            }
            else {
                foreach ($parameters as $key => $value) {
                    switch (strtolower(gettype($value))) {
                            #$type = Pdo::PARAM_BOOL;
                            #break;

                        case "boolean":
                        case "integer":
                            $type = Pdo::PARAM_INT;
                            break;

                        case "null":
                            $type = Pdo::PARAM_NULL;
                            break;

                        case "string":
                        default:
                            $type = Pdo::PARAM_STR;
                    }

                    $statement->bindValue($key, $value, $type);
                }
            }
        }
    }
}