Formly.Pro: AI-Powered Form Builder

// AI Form Generation Logic
class FormAIGenerator {
    private $openai_api_key;
    private $client;

    public function __construct($api_key) {
        $this->openai_api_key = $api_key;
        $this->client = new GuzzleHttp\Client();
    }

    public function generateForm($prompt, $user_preferences = []) {
        $system_prompt = "You are a form builder assistant. Generate a JSON structure
                         for a form based on the user's description. Include field types,
                         validation rules, and logical grouping.";

        $response = $this->client->post('https://api.openai.com/v1/chat/completions', [
            'headers' => [
                'Authorization' => 'Bearer ' . $this->openai_api_key,
                'Content-Type' => 'application/json',
            ],
            'json' => [
                'model' => 'gpt-4',
                'messages' => [
                    ['role' => 'system', 'content' => $system_prompt],
                    ['role' => 'user', 'content' => $prompt]
                ],
                'max_tokens' => 1000,
                'temperature' => 0.7
            ]
        ]);

        return $this->processAIResponse($response->getBody());
    }

    private function processAIResponse($response_body) {
        $data = json_decode($response_body, true);
        $form_structure = json_decode($data['choices'][0]['message']['content'], true);

        // Validate and sanitize the AI-generated structure
        return $this->validateFormStructure($form_structure);
    }
}

// Subscription Management
class SubscriptionManager {
    private $stripe;

    public function __construct() {
        \Stripe\Stripe::setApiKey(STRIPE_SECRET_KEY);
        $this->stripe = new \Stripe\StripeClient(STRIPE_SECRET_KEY);
    }

    public function createSubscription($customer_id, $price_id) {
        try {
            $subscription = $this->stripe->subscriptions->create([
                'customer' => $customer_id,
                'items' => [['price' => $price_id]],
                'payment_behavior' => 'default_incomplete',
                'payment_settings' => ['save_default_payment_method' => 'on_subscription'],
                'expand' => ['latest_invoice.payment_intent'],
            ]);

            return [
                'subscription_id' => $subscription->id,
                'client_secret' => $subscription->latest_invoice->payment_intent->client_secret,
                'status' => $subscription->status
            ];
        } catch (\Stripe\Exception\CardException $e) {
            return ['error' => $e->getError()->message];
        }
    }

    public function handleWebhook($payload, $sig_header) {
        $event = \Stripe\Webhook::constructEvent($payload, $sig_header, STRIPE_WEBHOOK_SECRET);

        switch ($event['type']) {
            case 'invoice.payment_succeeded':
                $this->updateSubscriptionStatus($event['data']['object']);
                break;
            case 'customer.subscription.deleted':
                $this->cancelSubscription($event['data']['object']);
                break;
        }
    }
}

// Frontend JavaScript for live form generation
class FormPreview {
    constructor() {
        this.previewContainer = document.getElementById('form-preview');
        this.promptInput = document.getElementById('form-prompt');
        this.setupEventListeners();
    }

    setupEventListeners() {
        document.getElementById('generate-btn').addEventListener('click', () => {
            this.generateForm();
        });

        this.promptInput.addEventListener('input', () => {
            this.debounceGeneration();
        });
    }

    async generateForm() {
        const prompt = this.promptInput.value.trim();
        if (!prompt) return;

        this.showLoading();

        try {
            const response = await fetch('/api/generate-form', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'X-CSRF-Token': document.querySelector('meta[name="csrf-token"]').content
                },
                body: JSON.stringify({ prompt: prompt })
            });

            const result = await response.json();

            if (result.success) {
                this.renderForm(result.form_structure);
                this.trackGeneration(prompt, result.form_id);
            } else {
                this.showError(result.error);
            }
        } catch (error) {
            this.showError('Failed to generate form. Please try again.');
        }
    }

    renderForm(formStructure) {
        let html = '
';

        formStructure.fields.forEach(field => {
            html += this.renderField(field);
        });

        html += 'Submit
';
        this.previewContainer.innerHTML = html;
    }
}