<?php

class PostData {
    public $errors = [];
    public $datas = [];

    private $fields = [];
    private $nonCleanDatas;
    private $validators;

    public function __construct() {
        $this->nonCleanDatas = $_POST;
        $this->validators = new Validator();
    }

    public function addField($name, $rules, $fieldName, $database = []) {
        $this->addFields($name, $rules, [$fieldName], $database);
    }

    public function addFields($name, $rules, $fieldNames, $database = []) {
        $this->fields[] = ["name"=>$name, "rules"=>$rules, "fieldNames"=>$fieldNames, "database"=>$database];
    }

    public function validate() {
        foreach ($this->fields as $field) {
            $this->validateField($field);
            $this->getDataFromField($field);
        }
        return (count($this->errors) == 0);
    }

    public function getField($field) {
        return $this->datas[$field];
    }

    private function validateField($field) {
        $rules = $field["rules"];
        if (count($rules) > 0) {
            foreach ($rules as $rule) {
                $this->applyValidation($rule, $field["name"], $this->nonCleanDatas, $field["fieldNames"], $field["database"]);
            }
        }
    }

    private function getDataFromField($field) {
        $fieldNames = $field["fieldNames"];
        foreach ($fieldNames as $name) {
            $this->datas[$name] = $this->nonCleanDatas[$name];
        }   
    }

    private function applyValidation($rule, $name, $array, $keys, $database) {
        $error = call_user_func(array($this->validators, $rule), $name, $this->nonCleanDatas, $keys, $database);
        if ($error != null) {
            echo($error);
            $this->errors[] = $error;
        }
    }
}