from fastapi import FastAPI, File, UploadFile, HTTPException
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware
from app.services.rag_service import RAGService
from app.services.bot_service import BotService
from app.utils.schedule_manager import ScheduleManager
from app.models import ChatRequest, ChatResponse, BookInfo, UploadResponse, ScheduleInfo, ScheduleRequest
import os
import json
from typing import List

# Initialize services
qdrant_service = QdrantService(os.getenv("QDRANT_URL", "http://qdrant:6333"))
rag_service = RAGService(qdrant_service, model_name=os.getenv("GPT4ALL_MODEL", "llama-3.2-3b-instruct-q4_0.gguf"))
bot_service = BotService(os.getenv("TELEGRAM_BOT_TOKEN", ""), os.getenv("TELEGRAM_CHAT_ID", ""))
schedule_manager = ScheduleManager(os.getenv("SCHEDULES_PATH", "/app/schedules.json"))

app = FastAPI(title="Espiritismo RAG API")

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

# Mount static files
app.mount("/static", StaticFiles(directory="../frontend/static"), name="static")

# Load existing schedules from file
def load_schedules():
    if os.path.exists("/app/schedules.json"):
        with open("/app/schedules.json", "r") as f:
            return json.load(f)
    return []

@app.get("/", response_class=HTMLResponse)
async def index():
    """Serve the index page."""
    with open("../backend/templates/index.html", "r") as f:
        return f.read()

@app.get("/api/books", response_model=List[BookInfo])
async def get_books():
    """Get list of books in the collection."""
    books = qdrant_service.get_books()
    return [{"title": book, "source": book} for book in books]

@app.post("/api/chat", response_model=ChatResponse)
async def chat(request: ChatRequest):
    """Query the RAG system."""
    try:
        result = rag_service.query(request.message, request.top_k)
        return result
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/upload", response_model=UploadResponse)
async def upload_pdf(file: UploadFile = File(...)):
    """Upload a new PDF file."""
    upload_dir = "/app/uploads"

    if not file.filename.endswith('.pdf'):
        raise HTTPException(status_code=400, detail="Only PDF files are allowed")

    file_path = os.path.join(upload_dir, file.filename)

    try:
        with open(file_path, "wb") as f:
            content = await file.read()
            f.write(content)

        return UploadResponse(message="File uploaded successfully", filename=file.filename)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/api/schedules", response_model=List[ScheduleInfo])
async def get_schedules():
    """Get all schedules."""
    schedules = load_schedules()
    return [ScheduleInfo(**s) for s in schedules]

@app.post("/api/schedules", response_model=ScheduleInfo)
async def create_schedule(request: ScheduleRequest):
    """Create a new schedule."""
    schedules = load_schedules()
    new_schedule = {
        "id": len(schedules) + 1,
        "time": request.time,
        "book": request.book,
        "enabled": request.enabled,
    }
    schedules.append(new_schedule)

    with open("/app/schedules.json", "w") as f:
        json.dump(schedules, f, indent=2)

    # Start celery beat if needed
    try:
        bot_service.add_schedule(new_schedule)
    except Exception as e:
        print(f"Warning: Could not add schedule to bot: {e}")

    return ScheduleInfo(**new_schedule)

@app.put("/api/schedules/{schedule_id}", response_model=ScheduleInfo)
async def update_schedule(schedule_id: int, request: ScheduleRequest):
    """Update an existing schedule."""
    schedules = load_schedules()

    for i, s in enumerate(schedules):
        if s["id"] == schedule_id:
            schedules[i] = {
                "id": schedule_id,
                "time": request.time,
                "book": request.book,
                "enabled": request.enabled,
            }

            with open("/app/schedules.json", "w") as f:
                json.dump(schedules, f, indent=2)

            try:
                bot_service.update_schedule(schedules[i])
            except Exception as e:
                print(f"Warning: Could not update schedule in bot: {e}")

            return ScheduleInfo(**schedules[i])

    raise HTTPException(status_code=404, detail="Schedule not found")

@app.delete("/api/schedules/{schedule_id}")
async def delete_schedule(schedule_id: int):
    """Delete a schedule."""
    schedules = load_schedules()

    for i, s in enumerate(schedules):
        if s["id"] == schedule_id:
            deleted = schedules.pop(i)

            with open("/app/schedules.json", "w") as f:
                json.dump(schedules, f, indent=2)

            try:
                bot_service.remove_schedule(deleted)
            except Exception as e:
                print(f"Warning: Could not remove schedule from bot: {e}")

            return {"message": "Schedule deleted"}

    raise HTTPException(status_code=404, detail="Schedule not found")