from fastapi import FastAPI, Depends, HTTPException, status
from fastapi.middleware.cors import CORSMiddleware
from fastapi.security import APIKeyHeader
import os

from routers import pdf_converter, pdf_compressor, pdf_to_images

# =========================
# API KEY CONFIGURATION
# =========================
API_KEY = os.getenv("PD_TOOLS_API_KEY")

if not API_KEY:
    raise RuntimeError("❌ PD_TOOLS_API_KEY not found in environment variables or HF Space Secrets")

# API Key Header
api_key_header = APIKeyHeader(name="X-API-Key", auto_error=False)

def verify_api_key(api_key: str = Depends(api_key_header)):
    """Verify the API key from request headers"""
    if not api_key:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Missing API key. Please provide X-API-Key header."
        )
    if api_key != API_KEY:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid API key"
        )
    return api_key

# =========================
# FASTAPI APP
# =========================
app = FastAPI(
    title="Document Converter API",
    description="Convert and manipulate PDF files with API key authentication",
    version="1.0.0"
)

# CORS configuration
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Create temp directory
TEMP_DIR = "/tmp/conversions"
os.makedirs(TEMP_DIR, exist_ok=True)

# Include routers with API key dependency
app.include_router(
    pdf_converter.router, 
    prefix="/pdf", 
    tags=["PDF Converter"],
    dependencies=[Depends(verify_api_key)]  # Add API key protection
)
app.include_router(
    pdf_compressor.router, 
    prefix="/pdf", 
    tags=["PDF Compressor"],
    dependencies=[Depends(verify_api_key)]  # Add API key protection
)
app.include_router(
    pdf_to_images.router, 
    prefix="/pdf", 
    tags=["PDF to Images"],
    dependencies=[Depends(verify_api_key)]  # Add API key protection
)

# =========================
# PUBLIC ENDPOINTS
# =========================
@app.get("/")
def read_root():
    """Public endpoint - no authentication required"""
    return {
        "message": "Document Converter API",
        "version": "1.0.0",
        "secured": True,
        "authentication": "Required for all /pdf/* endpoints",
        "endpoints": {
            "PDF Conversion": {
                "/pdf/to-word": "Convert PDF to Word (DOCX)",
                "/pdf/to-powerpoint": "Convert PDF to PowerPoint (PPTX)",
                "/pdf/to-excel": "Convert PDF to Excel (XLSX)",
                "/pdf/to-html": "Convert PDF to HTML",
                "/pdf/to-text": "Extract text from PDF"
            },
            "PDF Compression": {
                "/pdf/compress": "Compress PDF file"
            },
            "PDF to Images": {
                "/pdf/to-images": "Convert PDF pages to images (PNG/JPG)"
            },
            "Utilities": {
                "/health": "Health check"
            }
        },
        "usage": {
            "header": "X-API-Key",
            "example": "curl -H 'X-API-Key: your-api-key-here' https://your-space.hf.space/pdf/to-word"
        }
    }

@app.get("/health")
def health_check():
    """Public health check endpoint - no authentication required"""
    return {"status": "healthy", "service": "Document Converter API", "secured": True}

if __name__ == "__main__":
    import uvicorn
    port = int(os.environ.get("PORT", 7860))
    uvicorn.run(app, host="0.0.0.0", port=port)