# ==============================================================================
# Aura Mind Glow - Main Server (FastAPI + Gradio)
# ==============================================================================
"""
This script is the main entry point for the application. It launches a FastAPI
server that provides the diagnosis API and also serves the entire Gradio UI.

To run this server for development:
1. Make sure you have installed all packages from requirements.txt.
2. Run the command: uvicorn api_server:app --host 127.0.0.1 --port 7860

When deployed to Hugging Face Spaces, the Procfile will handle this command.
"""

# --- Essential Imports ---
from fastapi import FastAPI, UploadFile, File, HTTPException
from fastapi.responses import JSONResponse
from PIL import Image
import os
import warnings
import tempfile
import re
import io
import gradio as gr

# --- Import Core Components from Modules ---
# This setup is now shared between the API and the Gradio App
from vision_model import load_vision_model
from knowledge_base import KnowledgeBase
from agent_setup import initialize_adk
from bigquery_search import search_bigquery_for_remedy
from vector_store import embed_and_store_documents

# --- Import the Gradio UI from app.py ---
# We import the 'demo' object directly. The app.py script should not call demo.launch()
try:
    from app import demo as gradio_app
    print("✅ Gradio UI imported successfully from app.py.")
except ImportError as e:
    gradio_app = None
    print(f"❌ CRITICAL: Could not import Gradio UI from app.py: {e}")
    print("Ensure app.py defines a Gradio Blocks object named 'demo' and does not call .launch().")


print("✅ All server libraries imported successfully.")

# --- Global Initialization ---
warnings.filterwarnings("ignore")
os.environ["TORCH_COMPILE_DISABLE"] = "1"

print("Performing initial setup for server (this may take a moment)...")
VISION_MODEL, PROCESSOR = load_vision_model()
KB = KnowledgeBase()
RETRIEVER = KB
embed_and_store_documents()

adk_components = initialize_adk(VISION_MODEL, PROCESSOR, RETRIEVER)
DIAGNOSIS_TOOL = adk_components["diagnosis_tool"] if adk_components else None

if not DIAGNOSIS_TOOL:
    print("❌ CRITICAL: Diagnosis tool could not be initialized. The API will not work.")

print("✅ Server setup complete.")

# --- FastAPI App and Endpoint Logic ---
app = FastAPI(
    title="Aura Mind Glow API",
    description="Provides access to the plant diagnosis model and serves the Gradio UI.",
    version="1.0.0",
)

def run_diagnosis_logic(image: Image.Image):
    """
    Core logic for running diagnosis and getting remedies.
    """
    temp_file_path = None
    try:
        with tempfile.NamedTemporaryFile(delete=False, suffix=".png") as temp_file:
            image.save(temp_file.name)
            temp_file_path = temp_file.name

        diagnosis = DIAGNOSIS_TOOL(temp_file_path)
        if "Could not parse" in diagnosis:
            return {"error": f"Could not identify condition: {diagnosis}"}

        cleaned_diagnosis = re.sub(r'[^\w\s.\\-,\"]', '', diagnosis)
        cleaned_diagnosis = re.sub(r'\s+', ' ', cleaned_diagnosis).strip()

        local_remedy_list = search_documents(cleaned_diagnosis)
        local_remedy = local_remedy_list[0] if local_remedy_list else "No remedy found in local knowledge base."

        search_query = "healthy maize" if "healthy" in cleaned_diagnosis.lower() else "phosphorus" if "phosphorus" in cleaned_diagnosis.lower() else "general"
        cloud_remedy = search_bigquery_for_remedy(search_query)

        return {
            "diagnosis": diagnosis,
            "remedy_local": local_remedy,
            "remedy_cloud": cloud_remedy
        }
    finally:
        if temp_file_path:
            os.remove(temp_file_path)

@app.post("/diagnose/", tags=["Diagnosis"])
async def diagnose_endpoint(file: UploadFile = File(...)):
    """
    Receives an image file, performs diagnosis, and returns the result as JSON.
    """
    if not file.content_type.startswith('image/'):
        raise HTTPException(status_code=400, detail="File provided is not an image.")

    try:
        image_bytes = await file.read()
        image = Image.open(io.BytesIO(image_bytes))
        result = run_diagnosis_logic(image)

        if "error" in result:
            raise HTTPException(status_code=500, detail=result["error"])

        return JSONResponse(content=result)
    except Exception as e:
        print(f"❌ API Error: {e}")
        raise HTTPException(status_code=500, detail=f"An internal server error occurred: {e}")

# --- Mount the Gradio App ---
if gradio_app:
    app = gr.mount_gradio_app(app, gradio_app, path="/")
    print("✅ Gradio UI has been mounted on the FastAPI server at the root path '/'.")

# Note: The 'if __name__ == "__main__":' block with uvicorn.run() is removed.
# The Procfile will be used by Hugging Face to run the server.