A comprehensive FastAPI-based backend for generating Facebook content using AI. This is a complete migration of the original Streamlit-based Facebook writer to a modern REST API architecture.

Overview

The Facebook Writer API provides 10 different tools for creating, optimizing, and analyzing Facebook content:

Content Creation Tools

FB Post Generator - Create engaging Facebook posts with optimization features
FB Story Generator - Generate creative Facebook Stories with visual suggestions
FB Reel Generator - Create Reels scripts with music and hashtag suggestions
Carousel Generator - Generate multi-slide carousel posts

Business Tools

Event Description Generator - Create compelling event descriptions
Group Post Generator - Generate community-focused group posts
Page About Generator - Create professional page About sections

Marketing Tools

Ad Copy Generator - Generate high-converting ad copy with targeting suggestions
Hashtag Generator - Create relevant and trending hashtags
Engagement Analyzer - Analyze content performance and get optimization tips

API Architecture

Directory Structure

backend/api/facebook_writer/
├── models/           # Pydantic models for request/response
├── services/         # Business logic and AI integration
├── routers/          # FastAPI route definitions
└── README.md        # This file

Key Components

Models (`models/`)

Request Models: Strongly typed input validation using Pydantic
Response Models: Structured output with success/error handling
Enum Classes: Predefined options for dropdowns and selections

Services (`services/`)

Base Service: Common functionality and Gemini AI integration
Specialized Services: Individual services for each content type
Error Handling: Consistent error responses across all services

Routers (`routers/`)

FastAPI Routes: RESTful endpoints with automatic documentation
Request Validation: Automatic validation using Pydantic models
Response Formatting: Consistent JSON responses

API Endpoints

Health & Discovery

GET /api/facebook-writer/health - Health check
GET /api/facebook-writer/tools - List available tools
GET /api/facebook-writer/post/templates - Get post templates
GET /api/facebook-writer/analytics/benchmarks - Get industry benchmarks
GET /api/facebook-writer/compliance/guidelines - Get compliance guidelines

Content Generation

POST /api/facebook-writer/post/generate - Generate Facebook post
POST /api/facebook-writer/story/generate - Generate Facebook story
POST /api/facebook-writer/reel/generate - Generate Facebook reel
POST /api/facebook-writer/carousel/generate - Generate carousel post
POST /api/facebook-writer/event/generate - Generate event description
POST /api/facebook-writer/group-post/generate - Generate group post
POST /api/facebook-writer/page-about/generate - Generate page about
POST /api/facebook-writer/ad-copy/generate - Generate ad copy
POST /api/facebook-writer/hashtags/generate - Generate hashtags
POST /api/facebook-writer/engagement/analyze - Analyze engagement

Usage Examples

Generate a Facebook Post

import requests

payload = {
    "business_type": "Fitness coach",
    "target_audience": "Fitness enthusiasts aged 25-35", 
    "post_goal": "Increase engagement",
    "post_tone": "Inspirational",
    "include": "Success story, workout tips",
    "avoid": "Generic advice",
    "media_type": "Image",
    "advanced_options": {
        "use_hook": True,
        "use_story": True,
        "use_cta": True,
        "use_question": True,
        "use_emoji": True,
        "use_hashtags": True
    }
}

response = requests.post(
    "http://localhost:8000/api/facebook-writer/post/generate",
    json=payload
)

if response.status_code == 200:
    data = response.json()
    print(f"Generated post: {data['content']}")
    print(f"Expected reach: {data['analytics']['expected_reach']}")

Generate Ad Copy

payload = {
    "business_type": "E-commerce store",
    "product_service": "Wireless headphones",
    "ad_objective": "Conversions",
    "ad_format": "Single image",
    "target_audience": "Tech enthusiasts and music lovers",
    "targeting_options": {
        "age_group": "25-34",
        "interests": "Technology, Music",
        "location": "United States"
    },
    "unique_selling_proposition": "Premium sound at affordable prices",
    "budget_range": "Medium"
}

response = requests.post(
    "http://localhost:8000/api/facebook-writer/ad-copy/generate", 
    json=payload
)

Setup & Configuration

Environment Variables

Create a .env file in the backend directory:

GEMINI_API_KEY=your_gemini_api_key_here

Installation

cd backend
pip install -r requirements.txt

Running the Server

python -m uvicorn app:app --host 0.0.0.0 --port 8000 --reload

Testing

python test_facebook_writer.py

AI Integration

The API uses Google's Gemini AI through the existing gemini_provider service:

Text Generation: For creating content
Structured Output: For complex responses with multiple fields
Error Handling: Robust retry logic and fallbacks
Temperature Control: Optimized for different content types

Migration Notes

This FastAPI backend replaces the original Streamlit interface while maintaining all functionality:

✅ Migrated Features

All 10 Facebook writer tools
AI content generation using Gemini
Advanced options and customization
Analytics predictions
Optimization suggestions
Error handling and validation

🔄 Architecture Changes

UI Framework: Streamlit → FastAPI REST API
Input Handling: Streamlit widgets → Pydantic models
Output Format: Streamlit display → JSON responses
State Management: Session state → Stateless API
Integration: Direct function calls → HTTP endpoints

🎯 Benefits

Scalability: Can handle multiple concurrent requests
Integration: Easy to integrate with React frontend
Documentation: Automatic OpenAPI/Swagger docs
Testing: Comprehensive test coverage
Deployment: Standard FastAPI deployment options

API Documentation

When the server is running, visit:

Interactive Docs: http://localhost:8000/docs
ReDoc: http://localhost:8000/redoc
OpenAPI JSON: http://localhost:8000/openapi.json

Error Handling

All endpoints return consistent error responses:

{
    "success": false,
    "error": "Detailed error message",
    "content": null,
    "metadata": {
        "operation": "operation_name",
        "error_type": "ValueError"
    }
}

Performance

Response Time: ~2-5 seconds for content generation
Concurrency: Supports multiple simultaneous requests
Rate Limiting: Handled by Gemini API quotas
Caching: Consider implementing for repeated requests

Next Steps

Frontend Integration: Connect React UI to these endpoints
Authentication: Add user authentication and authorization
Rate Limiting: Implement API rate limiting
Caching: Add Redis for caching generated content
Monitoring: Add logging and metrics collection
Testing: Expand test coverage for edge cases

README.md

Facebook Writer API