app.py

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
import uvicorn
import os
from pathlib import Path
import mimetypes

from utils import log
from chat_handler import router as chat_router  # ← start_session & chat
from admin_routes import router as admin_router  # ← Admin API endpoints
from spark_startup import run_in_thread
from session import session_store  # ← Import session_store

# Fix MIME types for JavaScript files
mimetypes.add_type("application/javascript", ".js")
mimetypes.add_type("text/css", ".css")

app = FastAPI(
    title="Flare Orchestration Service",
    version="0.1.0",
    description="LLM-driven intent & API flow engine (bootstrap)",
)

run_in_thread()

# ---------------- Core chat/session routes --------------------------
app.include_router(chat_router)

# ---------------- Admin API routes ----------------------------------
app.include_router(admin_router)

# ---------------- Health probe (HF Spaces watchdog) -----------------
@app.get("/")
def health_check():
    return {"status": "ok"}

# ---------------- Serve Angular UI if exists ------------------------
static_path = Path("static")
log(f"🔍 Checking for static directory at: {static_path.absolute()}")
log(f"🔍 Static directory exists: {static_path.exists()}")

if static_path.exists() and static_path.is_dir():
    # List files in static directory
    files = list(static_path.iterdir())
    log(f"📁 Files in static directory: {[f.name for f in files]}")
    
    # Check for index.html
    index_path = static_path / "index.html"
    log(f"🔍 index.html exists: {index_path.exists()}")
    
    # Mount entire static directory
    app.mount("/static", StaticFiles(directory="static"), name="static")
    
    # Serve static files (Angular assets) - only if assets directory exists
    assets_path = static_path / "assets"
    if assets_path.exists() and assets_path.is_dir():
        app.mount("/assets", StaticFiles(directory=str(assets_path)), name="assets")
    
    # Root path - serve index.html
    @app.get("/")
    async def serve_root():
        index_path = static_path / "index.html"
        if index_path.exists():
            log("📄 Serving index.html")
            return FileResponse(str(index_path), media_type="text/html")
        log("⚠️ index.html not found, returning health check")
        return {"status": "ok", "sessions": len(session_store._sessions)}  # Fallback to health check
    
    # Serve JS files with correct MIME type
    @app.get("/{filename:path}.js")
    async def serve_js(filename: str):
        js_path = static_path / f"{filename}.js"
        if js_path.exists():
            return FileResponse(str(js_path), media_type="application/javascript")
        return {"error": "JS file not found"}, 404
    
    # Serve CSS files with correct MIME type
    @app.get("/{filename:path}.css")
    async def serve_css(filename: str):
        css_path = static_path / f"{filename}.css"
        if css_path.exists():
            return FileResponse(str(css_path), media_type="text/css")
        return {"error": "CSS file not found"}, 404
    
    # Catch-all route for Angular routing (must be last!)
    @app.get("/{full_path:path}")
    async def serve_angular(full_path: str):
        # Don't catch API routes
        if full_path.startswith("api/") or full_path in ["start_session", "chat", "health"]:
            return {"error": "Not found"}, 404
        
        # Return Angular index.html for all other routes
        index_path = static_path / "index.html"
        if index_path.exists():
            return FileResponse(str(index_path), media_type="text/html")
        return {"error": "UI not found"}, 404
else:
    log("⚠️ Static directory not found")
    # No UI built, just health endpoint
    @app.get("/")
    def health_check():
        return {"status": "ok", "message": "UI not found. Build Angular app first."}

if __name__ == "__main__":
    log("🌐 Starting Flare backend …")
    uvicorn.run(app, host="0.0.0.0", port=7860)