<?php
namespace nulib\db\_private;

use nulib\exceptions;

abstract class _base extends _common {
  protected static function verifix(&$sql, ?array &$bindings=null, ?array &$meta=null): void {
    if (is_array($sql)) {
      $prefix = $sql[0] ?? null;
      if ($prefix === null) {
        throw exceptions::invalid_type($sql, "cette requête sql");
      } elseif (_create::isa($prefix)) {
        $sql = _create::parse($sql, $bindings);
        $meta = ["isa" => "create", "type" => "ddl"];
      } elseif (_select::isa($prefix)) {
        $sql = _select::parse($sql, $bindings);
        $meta = ["isa" => "select", "type" => "dql"];
      } elseif (_insert::isa($prefix)) {
        $sql = _insert::parse($sql, $bindings);
        $meta = ["isa" => "insert", "type" => "dml"];
      } elseif (_update::isa($prefix)) {
        $sql = _update::parse($sql, $bindings);
        $meta = ["isa" => "update", "type" => "dml"];
      } elseif (_delete::isa($prefix)) {
        $sql = _delete::parse($sql, $bindings);
        $meta = ["isa" => "delete", "type" => "dml"];
      } elseif (_generic::isa($prefix)) {
        $sql = _generic::parse($sql, $bindings);
        $meta = ["isa" => "generic", "type" => null];
      } else {
        throw exceptions::invalid_type($sql, "cette requête sql");
      }
    } else {
      if (!is_string($sql)) $sql = strval($sql);
      if (_create::isa($sql)) {
        $meta = ["isa" => "create", "type" => "ddl"];
      } elseif (_select::isa($sql)) {
        $meta = ["isa" => "select", "type" => "dql"];
      } elseif (_insert::isa($sql)) {
        $meta = ["isa" => "insert", "type" => "dml"];
      } elseif (_update::isa($sql)) {
        $meta = ["isa" => "update", "type" => "dml"];
      } elseif (_delete::isa($sql)) {
        $meta = ["isa" => "delete", "type" => "dml"];
      } elseif (_generic::isa($sql)) {
        $meta = ["isa" => "generic", "type" => null];
      } else {
        $meta = ["isa" => "generic", "type" => null];
      }
    }
  }

  static function with($sql, ?array $params=null): array {
    static::verifix($sql, $params);
    return [$sql, $params];
  }

  function __construct($sql, ?array $bindings=null) {
    static::verifix($sql, $bindings, $meta);
    $this->sql = $sql;
    $this->bindings = $bindings;
    $this->meta = $meta;
  }

  /** @var string */
  protected $sql;

  function getSql(): string {
    return $this->sql;
  }

  /** @var ?array */
  protected $bindings;

  function getBindings(): ?array {
    return $this->bindings;
  }

  /** @var ?array */
  protected $meta;

  function isInsert(): bool {
    return ($this->meta["isa"] ?? null) === "insert";
  }
}