<?php
namespace ProVM\Alias\Model;

use ProVM\Concept\Model;

abstract class Mapping implements \ProVM\Concept\Model\Mapping
{
    protected string $input;
    protected string $output;
    protected \Closure $transformation;

    public function getInputName(): string
    {
        return $this->input;
    }
    public function getOutputName(): string
    {
        return $this->output;
    }
    public function getTransformation(): callable
    {
        return $this->transformation;
    }

    public function setInputName(string $input): \ProVM\Concept\Model\Mapping
    {
        $this->input = $input;
        return $this;
    }
    public function setOutputName(string $output): \ProVM\Concept\Model\Mapping
    {
        $this->output = $output;
        return $this;
    }
    public function setTransformation(callable $transformation): \ProVM\Concept\Model\Mapping
    {
        $this->transformation = $transformation;
        return $this;
    }

    public function __invoke(mixed $input, mixed &$output, ?array $params = null): void
    {
        if (is_array($input)) {
            $input_value = $input[$this->getInputName()];
        }
        if (is_a($input, Model::class)) {
            $input_value = $input->{$this->getInputName()}();
        }

        $args = [$input_value];
        if ($params !== null) {
            $args = array_merge($args, $params);
        }
        $output_value = call_user_func_array($this->getTransformation(), $args);

        if (is_array($output)) {
            $output[$this->getOutputName()] = $output_value;
        }
        if (is_a($output, Model::class)) {
            $output->{$this->getOutputName()}($output_value);
        }
    }
}