<?php

namespace Ulmus\Common;

abstract class Sql {

    public static function function($name, ...$arguments)
    {
        return new class($name, ...$arguments) {

            protected string $as = "";

            protected string $name;

            protected array $arguments;

            public function __construct(string $name, ...$arguments) {
                $this->name = $name;
                $this->arguments = $arguments;
                $this->parseArguments();
            }

            public function __toString() {
                return implode(' ', array_filter([
                    "{$this->name}(" . implode(", ", $this->arguments) . ")",
                    $this->as ? "AS {$this->as}" : false,
                ]));
            }

            public function as($fieldName) {
                $this->as = $fieldName;
                return $this;
            }

            protected function parseArguments() {
                foreach($this->arguments as &$item) {
                    $item = Sql::escape($item);
                }
            }
        };
    }

    public static function escape($value)
    {
        switch(true) {
            case is_object($value):
                # @TODO Make sure the object is a Field
                return (string) $value;
            break;

            case is_string($value):
                $value = "\"$value\"";
            break;

            case is_null($value):
                $value = "NULL";
            break;
        }

        return $value;
    }

    public static function parameter($value) : string
    {
        
    }
}