<?php

namespace bff\traits;

use Closure;
use Component;

trait AttachesComponents
{
    use ForwardsCalls;

    /**
     * Attached components.
     * @var array
     */
    protected $components = [];

    /**
     * Call the attached component method.
     * @param string $method {component}_{method}
     * @param array $parameters
     * @return mixed
     */
    public function callComponent($method, $parameters)
    {
        if (sizeof($this->components) > 0) {
            $method = explode('_', $method, 2);
            if (sizeof($method) === 2 && ! empty($method[0]) && ! empty($method[1])) {
                $component = $this->getComponent($method[0]);
                if ($component) {
                    return $this->forwardCallTo($component, $method[1], $parameters);
                }
            }
        }

        return null;
    }

    /**
     * Get the component object
     * @param string $name
     * @return Component|null
     */
    public function getComponent(string $name)
    {
        $name = mb_strtolower($name);
        if (isset($this->components[$name])) {
            if (($component = $this->components[$name]) instanceof Closure) {
                $this->components[$name] = $component();
            }
            return $this->components[$name];
        }

        return null;
    }

    /**
     * Attach the components.
     * @param array $components ['name' => Component|Closure, ...]
     * @return void
     */
    public function attachComponents(array $components)
    {
        foreach ($components as $name => $component) {
            $this->attachComponent($name, $component);
        }
    }

    /**
     * Attach the component.
     * @param string $name.
     * @param Component|Closure $component.
     * @return mixed
     */
    public function attachComponent(string $name, $component)
    {
        if (($exists = $this->getComponent($name)) !== null) {
            return $exists;
        }
        if ($component instanceof Component) {
            if (! $component->getIsInitialized()) {
                $component->init();
            }
            return ($this->components[$name] = $component);
        } elseif ($component instanceof Closure) {
            return ($this->components[$name] = $component);
        } else {
            return null;
        }
    }

    /**
     * Detach all the attached components.
     * @return void
     */
    public function detachComponents()
    {
        if (sizeof($this->components) > 0) {
            foreach ($this->components as $name => $component) {
                $this->detachComponent($name);
            }
            $this->components = [];
        }
    }

    /**
     * Detach the component.
     * @param string $name component name.
     * @return mixed
     */
    public function detachComponent(string $name)
    {
        if (($component = $this->getComponent($name)) !== null) {
            unset($this->components[mb_strtolower($name)]);
            return $component;
        }

        return null;
    }
}