<?php

namespace BSR\Lib\db;

use BSR\Lib\Exception\InvalidAttributeException;

/**
 * Base class for mapping objects. inherit you database filled objects from here.
 *
 * @property int $id
 */
abstract class DbMapping
{
    protected $attributes;
    protected $attributeNames = '';
    protected $privateAttributeNames = '';

    /**
     * @param array $attributes
     */
    public function __construct(array $attributes)
    {
        $this->setAttributes($attributes);
    }

    /**
     * Define a bunch of attribute given by an associative array
     * @param array $attributes
     */
    public function setAttributes(array $attributes)
    {
        $this->assertAttributes($attributes);
        foreach ($attributes as $key => $value) {
            $this->__set($key, $value);
        }
    }

    /**
     * Ensure that all keys from attributes are authorized
     * @param array $attributes
     */
    private function assertAttributes(array $attributes)
    {
        foreach ($attributes as $key => $value) {
            $this->assertAttribute($key);
        }
    }

    /**
     * Ensure that name attribute is authorized
     * If public_only is false, check against PRIVATE_ATTRIBUTES_NAME too.
     * Those one cannot be accessed via setAttributes and other batch methods.
     * @param string $name
     * @param bool $public_only
     * @throws InvalidAttributeException if the attribute is not a valid one
     */
    private function assertAttribute($name, $public_only = TRUE)
    {
        if (strpos($this->attributeNames, $name) === false && ($public_only || strpos($this->privateAttributeNames, $name) === false)) {
            throw(new InvalidAttributeException("The attribute $name is invalid"));
        }
    }

    /**
     * Get a user attribute or the linked wishes

     * @param string $name
     * @return mixed
     */
    public function __get($name)
    {
        $sql_safe = FALSE;
        if (strpos($name, 'sql_') === 0) {
            $name = substr($name, 4);
            $sql_safe = TRUE;
        }
        $this->assertAttribute($name, false);
        if (isset($this->attributes[$name])) {
            $value = $this->attributes[$name];
            if ($sql_safe) {
                $value = str_replace("'", "''", $value);
            }
            return $value;
        } else {
            return NULL;
        }
    }

    public function to_array() {
        return $this->attributes;
    }

    /**
     * Set a user attribute
     * @param string $name
     * @param mixed $value
     */
    public function __set($name, $value)
    {
        $this->assertAttribute($name, false);
        $this->attributes[$name] = $value;
    }

    /**
     * Return all the public attributes in an array;
     */
    public function toArray()
    {
        $result = array();
        foreach ($this->attributes as $name => $value) {
            if (strpos($this->attributeNames, $name) !== false) {
                $result[$name] = $value;
            }
        }
        return $result;
    }
}