Remove app/Space folder and extract model business logic into services

Relocate all 14 files from the catch-all app/Space namespace into proper
locations: data providers to Support/Formatters, installation utilities to
Services/Installation, PDF utils to Services/Pdf, module/update classes to
Services/Module and Services/Update, SiteApi trait to Traits, and helpers
to Support.

Extract ~1,400 lines of business logic from 8 fat models (Invoice, Payment,
Estimate, RecurringInvoice, Company, Customer, Expense, User) into 9 new
service classes with constructor injection. Controllers now depend on
services instead of calling static model methods. Shared item/tax creation
logic consolidated into DocumentItemService.

app/Services/Update/Updater.php

@@ -0,0 +1,152 @@
+<?php
+
+namespace App\Services\Update;
+
+use App\Events\UpdateFinished;
+use App\Models\Setting;
+use App\Traits\SiteApi;
+use Artisan;
+use File;
+use GuzzleHttp\Exception\RequestException;
+use ZipArchive;
+
+// Implementation taken from Akaunting - https://github.com/akaunting/akaunting
+class Updater
+{
+    use SiteApi;
+
+    public static function checkForUpdate($installed_version, $updater_channel = 'stable')
+    {
+        $data = null;
+        $url = sprintf('releases/update-check/%s?channel=%s', $installed_version, $updater_channel);
+
+        $response = static::getRemote($url, ['timeout' => 100, 'track_redirects' => true]);
+
+        $data = (object) ['success' => false, 'release' => null];
+        if ($response && ($response->getStatusCode() == 200)) {
+            $data = $response->getBody()->getContents();
+            $data = json_decode($data);
+        }
+
+        if ($data->success && $data->release && property_exists($data->release, 'extensions')) {
+            $extensions = [];
+            foreach ($data->release->extensions as $extension) {
+                $extensions[$extension] = phpversion($extension) !== false;
+            }
+            $extensions['php'.'('.$data->release->min_php_version.')'] = version_compare(phpversion(), $data->release->min_php_version, '>=');
+            $data->release->extensions = $extensions;
+        }
+
+        return $data;
+    }
+
+    public static function download($new_version, $is_cmd = 0)
+    {
+        $data = null;
+        $path = null;
+
+        $url = 'releases/download/'.$new_version.'.zip';
+        $response = static::getRemote($url, ['timeout' => 100, 'track_redirects' => true]);
+
+        // Exception
+        if ($response instanceof RequestException) {
+            return [
+                'success' => false,
+                'error' => 'Download Exception',
+                'data' => [
+                    'path' => $path,
+                ],
+            ];
+        }
+
+        if ($response && ($response->getStatusCode() == 200)) {
+            $data = $response->getBody()->getContents();
+        }
+
+        // Create temp directory
+        $temp_dir = storage_path('app/temp-'.md5(mt_rand()));
+
+        if (! File::isDirectory($temp_dir)) {
+            File::makeDirectory($temp_dir);
+        }
+
+        $zip_file_path = $temp_dir.'/upload.zip';
+
+        // Add content to the Zip file
+        $uploaded = is_int(file_put_contents($zip_file_path, $data)) ? true : false;
+
+        if (! $uploaded) {
+            return false;
+        }
+
+        return $zip_file_path;
+    }
+
+    public static function unzip($zip_file_path)
+    {
+        if (! file_exists($zip_file_path)) {
+            throw new \Exception('Zip file not found');
+        }
+
+        $temp_extract_dir = storage_path('app/temp2-'.md5(mt_rand()));
+
+        if (! File::isDirectory($temp_extract_dir)) {
+            File::makeDirectory($temp_extract_dir);
+        }
+        // Unzip the file
+        $zip = new ZipArchive;
+
+        if ($zip->open($zip_file_path)) {
+            $zip->extractTo($temp_extract_dir);
+        }
+
+        $zip->close();
+
+        // Delete zip file
+        File::delete($zip_file_path);
+
+        return $temp_extract_dir;
+    }
+
+    public static function copyFiles($temp_extract_dir)
+    {
+        if (! File::copyDirectory($temp_extract_dir.'/InvoiceShelf', base_path())) {
+            return false;
+        }
+
+        // Delete temp directory
+        File::deleteDirectory($temp_extract_dir);
+
+        return true;
+    }
+
+    public static function deleteFiles($json)
+    {
+        $files = json_decode($json);
+
+        foreach ($files as $file) {
+            File::delete(base_path($file));
+        }
+
+        return true;
+    }
+
+    public static function migrateUpdate()
+    {
+        Artisan::call('migrate --force');
+
+        return true;
+    }
+
+    public static function finishUpdate($installed, $version)
+    {
+        Setting::setSetting('version', $version);
+        event(new UpdateFinished($installed, $version));
+
+        return [
+            'success' => true,
+            'error' => false,
+            'data' => [],
+        ];
+    }
+}