<?php

namespace core\services;

use core\entities\ModuleRecord;
use core\repositories\ModuleRepository;
use yii\helpers\FileHelper;
use Yii;

class ModuleService
{
    private $modules;
    private $permission_manager;

    public function __construct(ModuleRepository $modules, PermissionManager $permission_manager)
    {
        $this->modules = $modules;
        $this->permission_manager = $permission_manager;
    }

    public function create($name, $class, $type = 'common', $active = ModuleRecord::STATUS_DISABLED): ModuleRecord
    {
    	$module = new ModuleRecord();
    	$module->name = $name;
    	$module->class = $class;
    	$module->type = $type;
    	$module->active = $active;
    	$this->modules->save($module);
    	return $module;
    }

    public function delete(ModuleRecord $module)
    {
	    // connect manifest
	    $manifest = require Yii::getAlias('@common/modules/' . $module->name . '/manifest.php');

    	// down migrations
	    $migrations = $this->getMigrationFiles($module->name);
	    $migrations = array_reverse($migrations);
	    foreach ($migrations as $migrationPath) {
		    $migrationFile = basename($migrationPath);
		    $migration = str_replace('.php', '', $migrationFile);
		    if ($this->migrationExists($migration)) {
			    require $migrationPath;
			    $obj = new $migration;
			    if (method_exists($obj, 'safeDown')) {
				    $obj->safeDown();
				    Yii::$app->moduleManager->removeFromMigrationTable($migration);

			    }
			    elseif (method_exists($obj, 'down')) {
				    $obj->down();
				    Yii::$app->moduleManager->removeFromMigrationTable($migration);
			    }
		    }
	    }

	    // remove permissions
	    if (isset($manifest['permissions']) && is_array($manifest['permissions'])) {
		    $this->removePermissions($manifest['permissions']);
	    }

	    // delete files
	    $modulePath = Yii::getAlias('@common/modules/' . $module->name);
	    if (file_exists($modulePath)) {
	    	FileHelper::removeDirectory($modulePath);
	    }
	    // delete module record
	    $this->modules->remove($module);
    }

    public function disable(ModuleRecord $module)
    {
    	$module->active = ModuleRecord::STATUS_DISABLED;
    	$this->modules->save($module);
    }

	public function enable(ModuleRecord $module)
	{
		// connect manifest
		$manifest = require Yii::getAlias('@common/modules/' . $module->name . '/manifest.php');

		$module->active = ModuleRecord::STATUS_ENABLED;

		// migration if not exists
		$migrations = $this->getMigrationFiles($module->name);
		foreach ($migrations as $migrationPath) {
			$migrationFile = basename($migrationPath);
			$migration = str_replace('.php', '', $migrationFile);
			if (!$this->migrationExists($migration)) {
				// run migration
				require $migrationPath;
				$obj = new $migration;
				if (method_exists($obj, 'safeUp')) {
					$obj->safeUp();
					Yii::$app->moduleManager->appendToMigrationTable($migration);

				}
				elseif (method_exists($obj, 'up')) {
					$obj->up();
					Yii::$app->moduleManager->appendToMigrationTable($migration);
				}
			}
		}

		// add not exists permissions
		if (isset($manifest['permissions']) && is_array($manifest['permissions'])) {
			$this->assignPermissions($manifest['permissions']);
		}

		$this->modules->save($module);
	}

	private function assignPermissions(array $permissions): void
	{
		foreach ($permissions as $permission => $description) {
			if (!$this->permission_manager->permissionExists($permission)) {
				$this->permission_manager->create($permission, $description);
			}
		}
	}

	private function removePermissions(array $permissions)
	{
		foreach ($permissions as $permission => $description) {
			if ($this->permission_manager->permissionExists($permission)) {
				$this->permission_manager->delete($permission);
			}
		}
	}

	private function getMigrationFiles($module)
	{
		// migration if not exists
		$migrationPath = Yii::getAlias('@common/modules/' . $module . '/migrations');
		return file_exists($migrationPath) ? FileHelper::findFiles($migrationPath) : [];
	}

	private function migrationExists($name): bool
	{
		// check record exists
		$connection = Yii::$app->getDb();
		$command = $connection->createCommand("SELECT * FROM migration WHERE version = '$name'");
		$result = $command->queryAll();
		return $result ? true : false;
	}
}