<?php

namespace App\Models;

use App\Handlers\Contracts\TemplateHandler;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\App;

/**
 * Class Module
 */
class Module extends Model
{
    public $timestamps = false;
    protected $fillable = [
        'handler',
        'parent_id',
        'name',
        'description',
        'alias',
        'module_settings',
        'enabled',
        'support_categories',
        'manages_content',
        'is_template'
    ];
    protected $guarded = [];

    /**
     * Create new module in database
     *
     * @param        $name
     * @param        $alias
     * @param string $description
     * @param null   $handler
     * @param        $parentModuleId
     * @param array  $settings
     *
     * @return Module
     * @throws \ErrorException
     */
    public static function install($name, $alias, $description, $handler, $parentModuleId, $settings)
    {
        // check if user does not want to install module in runtime
        if (!App::runningInConsole()) {
            throw new \ErrorException('Modules can be installed only via Artisan!');
        }

        $managesContent = $handler ? in_array('App\Handlers\Contracts\AppHandler', class_implements($handler)) : false;
        $isTemplate = $handler ? in_array(TemplateHandler::class, class_implements($handler)) : false;
        $supportCategories = $managesContent ? call_user_func([$handler, 'supportCategories']) : false;

        if ($parentModuleId) {
            $parentModule = Module::findOrFail($parentModuleId);
            $parentModule->has_submodules = true;
            $parentModule->save();
        }

        // insert module into database
        $module = Module::create([
                                     'name'               => $name,
                                     'description'        => $description,
                                     'handler'            => $handler,
                                     'manages_content'    => $managesContent,
                                     'support_categories' => $supportCategories,
                                     'alias'              => $alias,
                                     'module_settings'    => json_encode($settings),
                                     'parent_id'          => $parentModuleId ? $parentModuleId : null,
                                     'enabled'            => 1,
                                     'is_template'        => $isTemplate
                                 ]);

        // install something module-specific
        if ($handler) {
            call_user_func([$handler, 'install']);
        }

        return $module;
    }

    /**
     * Delete module from database and uninstall its dependencies
     *
     * @throws \ErrorException
     */
    public function uninstall()
    {
        // check if user does not want to install module in runtime
        if (!App::runningInConsole()) {
            throw new \ErrorException('Modules can be uninstalled only via Artisan!');
        }

        // delete everything in /resources/views/visitor
        if ($this->is_template) {
            $this->deleteDirectory(resource_path('views/visitor'));
            $this->deleteDirectory(resource_path('views/modules'));
            $this->deleteDirectory(public_path('assets'));

            // delete all template paths
            TemplatePath::getQuery()->delete();
        }

        if ($this->handler && is_callable([$this->handler, 'uninstall'])) {
            call_user_func([$this->handler, 'uninstall'], $this);
        }

        $this->delete();
    }

    /**
     * Delete directory when uninstalling module.
     *
     * @param $directory
     *
     * @throws \ErrorException
     */
    private function deleteDirectory($directory)
    {
        if (!is_dir($directory))
            return;

        $success = \File::deleteDirectory($directory, true);

        if (!$success) {
            throw new \ErrorException('Cannot delete ' . $directory);
        }
    }
}