AI-powered product description generator with e-commerce sync for online stores.

Build me an AI-powered product description generator that connects directly to Shopify stores.

## Project Goal
An app for Shopify merchants that eliminates the tedious manual work of writing product descriptions. It connects to their store, lets them generate high-quality, on-brand descriptions using AI, and syncs the new content back to their products with one click.

## Target User
The user is a Shopify store owner, typically with a catalog of 50-1000+ products. They are not professional copywriters and are looking for ways to save time on repetitive e-commerce tasks so they can focus on marketing and sales. They are active in communities like r/shopify and are already using multiple apps to run their store.

## Day-one Shippable Scope
This is the absolute minimum to test the core loop. Cut everything else if this takes more than two days.
1.  **Shopify OAuth:** User must be able to securely connect their Shopify store using the standard Shopify app installation flow.
2.  **Product List:** After connecting, display a simple, un-styled list of product titles fetched from their store via the Shopify API.
3.  **Generate & Sync:** When a user clicks a product title, trigger a server-side AI call using the product's title as the prompt to generate a 3-sentence description. Display the generated text and a single button: 'Push to Shopify'. Clicking this button updates that specific product's description field in their store.

## Full Feature List
*   **Shopify Store Connection:** Secure OAuth 2.0 flow for adding the app to a Shopify store.
*   **Products Dashboard:** A dashboard that lists all products from the connected store. Each row should show the product's main image, title, and a status tag indicating if it has a description ('Generated' or 'Missing').
*   **Single Product Generation:** Clicking a product opens a generation view. This view shows the product title, image, and any existing description.
*   **AI Generation Controls:** In the generation view, provide:
    *   A multi-line text field for 'Key Features' (e.g., 'Made from 100% organic cotton', 'Water-resistant up to 50m').
    *   A dropdown for 'Tone of Voice' with options: 'Professional', 'Casual', 'Witty', 'Luxury'.
    *   A text input for 'SEO Keywords' to include in the description.
*   **Bulk Generation:** On the Products Dashboard, allow users to select multiple products via checkboxes and click a 'Generate for Selected' button to create descriptions for all of them at once.
*   **One-Click Sync:** A 'Sync to Shopify' button that instantly updates the product description field in the user's Shopify admin. This should be available for both single and bulk updates.
*   **Credit System:** A simple counter in the UI that shows 'Descriptions Remaining: X' based on the user's subscription plan.

## Database Schema
*   **`users`**: (managed by Lovable Auth)
*   **`stores`**:
    *   `id`: (uuid, primary key)
    *   `user_id`: (uuid, foreign key to `users.id`)
    *   `shop_domain`: (text, e.g., 'my-cool-store.myshopify.com')
    *   `shopify_access_token`: (text, encrypted)
    *   *RLS: A user can only access the stores where `user_id` matches their own `auth.uid()`.*
*   **`products`**:
    *   `id`: (uuid, primary key)
    *   `store_id`: (uuid, foreign key to `stores.id`)
    *   `shopify_product_id`: (bigint, unique)
    *   `title`: (text)
    *   `image_url`: (text)
    *   `has_ai_description`: (boolean, default false)
    *   *RLS: A user can access products if they own the parent store.*
*   **`generations`**:
    *   `id`: (uuid, primary key)
    *   `product_id`: (uuid, foreign key to `products.id`)
    *   `user_id`: (uuid, foreign key to `users.id`)
    *   `generated_text`: (text)
    *   `created_at`: (timestamp)
    *   *RLS: A user can only access their own generations.*
*   **`subscriptions`**:
    *   `user_id`: (uuid, primary key, foreign key to `users.id`)
    *   `plan`: (text, e.g., 'free', 'standard', 'pro')
    *   `credits_remaining`: (integer)
    *   `stripe_customer_id`: (text)
    *   *RLS: A user can only access their own subscription record.*

## Landing Page Sections
*   **Hero Section:**
    *   **Headline:** Stop Writing, Start Selling.
    *   **Sub-headline:** Generate unique, SEO-friendly product descriptions in minutes, not weeks. Our AI syncs directly to your Shopify store—no more copy-pasting.
    *   **CTA Button:** Install Shopify App
*   **How it Works (3-step graphic):**
    *   **1. Connect Your Store:** Install our app in one click.
    *   **2. Generate Descriptions:** Select products and let our AI write compelling copy based on their title and your brand's tone.
    *   **3. Sync & Sell:** Push new descriptions live to your Shopify store instantly.
*   **Feature Spotlight:**
    *   **Section 1 (Bulk Power):** Title: From 10 to 10,000 SKUs. Text: Whether you're launching a new collection or refreshing your entire catalog, generate descriptions for all your products at once.
    *   **Section 2 (On-Brand Tone):** Title: Write Like You, But Faster. Text: Choose a tone—from 'Luxury' to 'Witty'—and our AI adapts to match your brand's voice, ensuring consistency across your store.
    *   **Section 3 (Seamless Sync):** Title: No More Spreadsheets. Text: Forget copy-pasting. Push your new, perfect descriptions directly to Shopify with a single click.

## Pricing Page Contents
*   **Free Plan:**
    *   Price: €0
    *   Features: 5 one-time description credits. The perfect way to see the magic.
*   **Standard Plan:**
    *   Price: €29/month
    *   Features: 100 description credits per month, Custom Tone of Voice control, Single product generation.
*   **Pro Plan:**
    *   Price: €79/month
    *   Features: 500 description credits per month, All features from Standard, Bulk generation for up to 50 products at once.