<?php

namespace Nest\Database\Query;

use Nest\Database\Database;

/**
 * Database query builder.
 */
class QueryBuilder
{
	/**
	 * Base table of the query.
	 * @var string
	 */
	protected string $table;

	/**
	 * Build a new query builder.
	 * @param Database $database The database on which to execute the query.
	 * @param string|null $table Base table of the query.
	 */
	public function __construct(protected Database $database, ?string $table = null)
	{
		if (!empty($table)) $this->setTable($table);
	}

	/**
	 * Get the database on which to execute the query.
	 * @return Database
	 */
	public function getDatabase(): Database
	{
		return $this->database;
	}

	/**
	 * Set the table to use in the query.
	 * @param string $table The table to use in the query.
	 * @return $this
	 */
	public function setTable(string $table): static
	{
		$this->table = $table;
		return $this;
	}

	/**
	 * Get the table to use in the query.
	 * @return string
	 */
	public function getTable(): string
	{
		return $this->table;
	}

	/**
	 * Create a new SELECT query.
	 * @return SelectQuery A select query.
	 */
	public function newSelect(): SelectQuery
	{
		return new SelectQuery($this->getDatabase(), $this->getTable());
	}

	/**
	 * Create a new INSERT query.
	 * @return InsertQuery An INSERT query.
	 */
	public function newInsert(): InsertQuery
	{
		return new InsertQuery($this->getDatabase(), $this->getTable());
	}

	/**
	 * Create a new UPDATE query.
	 * @return UpdateQuery An UPDATE query.
	 */
	public function newUpdate(): UpdateQuery
	{
		return new UpdateQuery($this->getDatabase(), $this->getTable());
	}

	/**
	 * Create a new DELETE query.
	 * @return DeleteQuery A DELETE query.
	 */
	public function newDelete(): DeleteQuery
	{
		return new DeleteQuery($this->getDatabase(), $this->getTable());
	}
}