refactor(services): split driver infrastructure out of Services into Support

Services/Integrations/ExchangeRate/ and Services/Pdf/ were both mostly Support-shaped: interfaces, abstract classes, static factories, concrete adapter drivers, DTOs, and exceptions — infrastructure that doesn't carry business logic. They only each had one real DI-injected service mixed in.

This commit applies the same Services=DI-business-logic / Support=stateless-plumbing rule we've been using throughout the reorg:

**Moved to Support/Integrations/ExchangeRate/** (7 files): ExchangeRateDriver (abstract), ExchangeRateDriverFactory (static), ExchangeRateException, and the four concrete drivers (CurrencyConverter, CurrencyFreak, CurrencyLayer, OpenExchangeRate). These are HTTP adapters over third-party currency APIs — same shape as the Hashids library wrapper classes already in Support.

**Moved to Support/Pdf/** (6 files, merging with existing Pdf utilities): PdfDriver (interface), PdfDriverFactory (static), PdfService (static facade), GotenbergPdfDriver, GotenbergPdfResponse (DTO), ResponseStream (interface). The Support/Pdf/ dir now contains the full PDF rendering subsystem — drivers + sanitizer + template/image utilities.

**Promoted to Services/ root** (the real DI services): ExchangeRateProviderService (CRUD for ExchangeRateProvider model) and FontService (font package install/download orchestration). Both are proper DI services — instance methods, model writes, HTTP side effects.

Services/Integrations/ and Services/Pdf/ are now empty and deleted. Services/ holds only DI-injected classes; Support/ holds all the plumbing.

17 files renamed (git detects 90-99% similarity), 4 consumer files updated (DriverRegistryProvider, PdfServiceProvider, ExchangeRateProviderController, FontController, GeneratesPdfTrait, test). 350 tests pass, Pint clean.

app/Support/Integrations/ExchangeRate/CurrencyConverterDriver.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+use Illuminate\Support\Facades\Http;
+
+class CurrencyConverterDriver extends ExchangeRateDriver
+{
+    public function getExchangeRate(string $baseCurrency, string $targetCurrency): array
+    {
+        $baseUrl = $this->getBaseUrl();
+        $query = "{$baseCurrency}_{$targetCurrency}";
+        $url = "{$baseUrl}/api/v7/convert?apiKey={$this->apiKey}&q={$query}&compact=y";
+        $response = Http::get($url)->json();
+
+        return array_values($response[$query]);
+    }
+
+    public function getSupportedCurrencies(): array
+    {
+        $baseUrl = $this->getBaseUrl();
+        $url = "{$baseUrl}/api/v7/currencies?apiKey={$this->apiKey}";
+        $response = Http::get($url)->json();
+
+        if ($response == null) {
+            throw new ExchangeRateException('Server not responding', 'server_error');
+        }
+
+        if (array_key_exists('results', $response)) {
+            return array_keys($response['results']);
+        }
+
+        throw new ExchangeRateException('Please Enter Valid Provider Key.', 'invalid_key');
+    }
+
+    public function validateConnection(): array
+    {
+        $baseUrl = $this->getBaseUrl();
+        $query = 'INR_USD';
+        $url = "{$baseUrl}/api/v7/convert?apiKey={$this->apiKey}&q={$query}&compact=y";
+        $response = Http::get($url)->json();
+
+        return array_values($response[$query]);
+    }
+
+    private function getBaseUrl(): string
+    {
+        $type = $this->config['type'] ?? 'FREE';
+
+        return match ($type) {
+            'PREMIUM' => 'https://api.currconv.com',
+            'PREPAID' => 'https://prepaid.currconv.com',
+            'FREE' => 'https://free.currconv.com',
+            'DEDICATED' => $this->config['url'] ?? 'https://free.currconv.com',
+        };
+    }
+}

app/Support/Integrations/ExchangeRate/CurrencyFreakDriver.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+use Illuminate\Support\Facades\Http;
+
+class CurrencyFreakDriver extends ExchangeRateDriver
+{
+    private string $baseUrl = 'https://api.currencyfreaks.com';
+
+    public function getExchangeRate(string $baseCurrency, string $targetCurrency): array
+    {
+        $url = "{$this->baseUrl}/latest?apikey={$this->apiKey}&symbols={$targetCurrency}&base={$baseCurrency}";
+        $response = Http::get($url)->json();
+
+        if (array_key_exists('success', $response) && $response['success'] == false) {
+            throw new ExchangeRateException($response['error']['message'], 'provider_error');
+        }
+
+        return array_values($response['rates']);
+    }
+
+    public function getSupportedCurrencies(): array
+    {
+        $url = "{$this->baseUrl}/currency-symbols";
+        $response = Http::get($url)->json();
+
+        if ($response == null) {
+            throw new ExchangeRateException('Server not responding', 'server_error');
+        }
+
+        $checkKey = $this->validateConnection();
+
+        return array_keys($response);
+    }
+
+    public function validateConnection(): array
+    {
+        $url = "{$this->baseUrl}/latest?apikey={$this->apiKey}&symbols=INR&base=USD";
+        $response = Http::get($url)->json();
+
+        if ($response == null) {
+            throw new ExchangeRateException('Server not responding', 'server_error');
+        }
+
+        if (array_key_exists('success', $response) && array_key_exists('error', $response)) {
+            if ($response['error']['status'] == 404) {
+                throw new ExchangeRateException('Please Enter Valid Provider Key.', 'invalid_key');
+            }
+        }
+
+        return array_values($response['rates']);
+    }
+}

app/Support/Integrations/ExchangeRate/CurrencyLayerDriver.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+use Illuminate\Support\Facades\Http;
+
+class CurrencyLayerDriver extends ExchangeRateDriver
+{
+    private string $baseUrl = 'http://api.currencylayer.com';
+
+    public function getExchangeRate(string $baseCurrency, string $targetCurrency): array
+    {
+        $url = "{$this->baseUrl}/live?access_key={$this->apiKey}&source={$baseCurrency}&currencies={$targetCurrency}";
+        $response = Http::get($url)->json();
+
+        if (array_key_exists('success', $response) && $response['success'] == false) {
+            throw new ExchangeRateException($response['error']['info'], 'provider_error');
+        }
+
+        return array_values($response['quotes']);
+    }
+
+    public function getSupportedCurrencies(): array
+    {
+        $url = "{$this->baseUrl}/list?access_key={$this->apiKey}";
+        $response = Http::get($url)->json();
+
+        if ($response == null) {
+            throw new ExchangeRateException('Server not responding', 'server_error');
+        }
+
+        if (array_key_exists('currencies', $response)) {
+            return array_keys($response['currencies']);
+        }
+
+        throw new ExchangeRateException('Please Enter Valid Provider Key.', 'invalid_key');
+    }
+
+    public function validateConnection(): array
+    {
+        $url = "{$this->baseUrl}/live?access_key={$this->apiKey}&source=INR&currencies=USD";
+        $response = Http::get($url)->json();
+
+        if (array_key_exists('success', $response) && $response['success'] == false) {
+            throw new ExchangeRateException($response['error']['info'], 'provider_error');
+        }
+
+        return array_values($response['quotes']);
+    }
+}

app/Support/Integrations/ExchangeRate/ExchangeRateDriver.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+abstract class ExchangeRateDriver
+{
+    public function __construct(
+        protected string $apiKey,
+        protected array $config = [],
+    ) {}
+
+    /**
+     * Fetch exchange rate between two currencies.
+     *
+     * @return array Exchange rate values
+     */
+    abstract public function getExchangeRate(string $baseCurrency, string $targetCurrency): array;
+
+    /**
+     * Get list of currencies supported by this provider.
+     *
+     * @return array Currency codes
+     */
+    abstract public function getSupportedCurrencies(): array;
+
+    /**
+     * Validate that the API key and connection work.
+     *
+     * @return array Exchange rate values (proof of working connection)
+     *
+     * @throws ExchangeRateException
+     */
+    abstract public function validateConnection(): array;
+}

app/Support/Integrations/ExchangeRate/ExchangeRateDriverFactory.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+use InvalidArgumentException;
+use InvoiceShelf\Modules\Registry;
+
+class ExchangeRateDriverFactory
+{
+    /**
+     * Built-in driver fallback map.
+     *
+     * Kept as a backstop so that direct calls to register() (without going through
+     * the module Registry) continue to work. Built-in drivers are also registered
+     * via the Registry by DriverRegistryProvider — that registration is the
+     * canonical source for driver metadata (label, website, config_fields).
+     *
+     * @var array<string, class-string<ExchangeRateDriver>>
+     */
+    protected static array $drivers = [
+        'currency_freak' => CurrencyFreakDriver::class,
+        'currency_layer' => CurrencyLayerDriver::class,
+        'open_exchange_rate' => OpenExchangeRateDriver::class,
+        'currency_converter' => CurrencyConverterDriver::class,
+    ];
+
+    /**
+     * Register a custom exchange rate driver directly with the factory.
+     *
+     * Modules should prefer Registry::registerExchangeRateDriver() instead, which
+     * carries metadata (label, website, config_fields) the frontend needs to render
+     * a configuration form for the driver.
+     */
+    public static function register(string $name, string $driverClass): void
+    {
+        static::$drivers[$name] = $driverClass;
+    }
+
+    public static function make(string $driver, string $apiKey, array $config = []): ExchangeRateDriver
+    {
+        $class = static::resolveDriverClass($driver);
+
+        if (! $class) {
+            throw new InvalidArgumentException("Unknown exchange rate driver: {$driver}");
+        }
+
+        return new $class($apiKey, $config);
+    }
+
+    /**
+     * Get all known driver names — both built-in/factory-registered and Registry-registered.
+     *
+     * @return array<int, string>
+     */
+    public static function availableDrivers(): array
+    {
+        $local = array_keys(static::$drivers);
+        $registry = array_keys(Registry::allDrivers('exchange_rate'));
+
+        return array_values(array_unique(array_merge($local, $registry)));
+    }
+
+    /**
+     * Resolve a driver name to its concrete class.
+     *
+     * Checks the local $drivers map first (built-ins and factory::register() calls),
+     * then falls back to the module Registry.
+     */
+    protected static function resolveDriverClass(string $driver): ?string
+    {
+        if (isset(static::$drivers[$driver])) {
+            return static::$drivers[$driver];
+        }
+
+        $meta = Registry::driverMeta('exchange_rate', $driver);
+
+        return $meta['class'] ?? null;
+    }
+}

app/Support/Integrations/ExchangeRate/ExchangeRateException.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+class ExchangeRateException extends \RuntimeException
+{
+    public function __construct(string $message, public readonly string $errorKey = 'exchange_rate_error')
+    {
+        parent::__construct($message);
+    }
+}

app/Support/Integrations/ExchangeRate/OpenExchangeRateDriver.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace App\Support\Integrations\ExchangeRate;
+
+use Illuminate\Support\Facades\Http;
+
+class OpenExchangeRateDriver extends ExchangeRateDriver
+{
+    private string $baseUrl = 'https://openexchangerates.org/api';
+
+    public function getExchangeRate(string $baseCurrency, string $targetCurrency): array
+    {
+        $url = "{$this->baseUrl}/latest.json?app_id={$this->apiKey}&base={$baseCurrency}&symbols={$targetCurrency}";
+        $response = Http::get($url)->json();
+
+        if (array_key_exists('error', $response)) {
+            throw new ExchangeRateException($response['description'], $response['message']);
+        }
+
+        return array_values($response['rates']);
+    }
+
+    public function getSupportedCurrencies(): array
+    {
+        $url = "{$this->baseUrl}/currencies.json";
+        $response = Http::get($url)->json();
+
+        if ($response == null) {
+            throw new ExchangeRateException('Server not responding', 'server_error');
+        }
+
+        $checkKey = $this->validateConnection();
+
+        return array_keys($response);
+    }
+
+    public function validateConnection(): array
+    {
+        $url = "{$this->baseUrl}/latest.json?app_id={$this->apiKey}&base=USD&symbols=EUR";
+        $response = Http::get($url)->json();
+
+        if (array_key_exists('error', $response)) {
+            if ($response['status'] == 401) {
+                throw new ExchangeRateException('Please Enter Valid Provider Key.', 'invalid_key');
+            }
+
+            throw new ExchangeRateException($response['description'], $response['message']);
+        }
+
+        return array_values($response['rates']);
+    }
+}