from fastapi import FastAPI, HTTPException
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from pydantic import BaseModel
from backend.app.problem_generator import ProblemGenerationPipeline
from backend.app.problem_grader import ProblemGradingPipeline
from typing import Dict, List
import asyncio
import logging
import os
from backend.app.crawler import DomainCrawler
from backend.app.vectorstore import get_all_unique_source_of_docs_in_collection_DUMB
from enum import Enum

app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # In production, replace with specific origins
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


class IngestStatus(Enum):
    RECEIVED = "RECEIVED"
    FAILURE = "FAILURE"


class IngestRequest(BaseModel):
    topic: str
    url: str


class IngestResponse(BaseModel):
    status: IngestStatus


class UrlInput(BaseModel):
    url: str


class UserQuery(BaseModel):
    user_query: str


# TODO: Make this a list of {problem: str, answer: str}. Would be cleaner for data validation
class FeedbackRequest(BaseModel):
    user_query: str
    problems: list[str]
    user_answers: list[str]


class FeedbackResponse(BaseModel):
    feedback: List[str]


class TopicsResponse(BaseModel):
    sources: List[str]


# TODO maybe call this /api/scan/ just to be consistent and match FE?
@app.post("/api/ingest/", response_model=IngestResponse)
async def ingest_documentation(input_data: IngestRequest):
    print(f"Received url {input_data.url}")
    return IngestResponse(status=IngestStatus.RECEIVED)


@app.post("/api/problems/")
async def generate_problems(query: UserQuery):
    problems = ProblemGenerationPipeline().generate_problems(query.user_query)
    return {"Problems": problems}


@app.post("/api/feedback", response_model=FeedbackResponse)
async def get_feedback(request: FeedbackRequest):
    if len(request.problems) != len(request.user_answers):
        raise HTTPException(
            status_code=400,
            detail="Problems and user answers must have the same length",
        )
    try:
        grader = ProblemGradingPipeline()

        grading_tasks = [
            grader.grade(
                query=request.user_query,
                problem=problem,
                answer=user_answer,
            )
            for problem, user_answer in zip(request.problems, request.user_answers)
        ]

        feedback_list = await asyncio.gather(*grading_tasks)

        return FeedbackResponse(feedback=feedback_list)

    except Exception as e:
        # log exception and stack trace
        import traceback

        print(f"Exception: {e}")
        print(f"Stack trace: {traceback.format_exc()}")
        raise HTTPException(status_code=500, detail=str(e))


@app.get("/api/topics", response_model=TopicsResponse)
async def get_topics():
    sources = get_all_unique_source_of_docs_in_collection_DUMB()
    return {"sources": sources}


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


# Root path handler
@app.get("/")
async def serve_root():
    return FileResponse("/app/static/index.html")


# Catch-all route for serving index.html
@app.get("/{full_path:path}")
async def serve_react(full_path: str):
    # Skip API routes
    if full_path.startswith("api/"):
        raise HTTPException(status_code=404, detail="Not found")

    # For all other routes, serve the React index.html
    return FileResponse("/app/static/index.html")


def setup_logging():
    """Configure logging for the entire application"""
    # Create logs directory if it doesn't exist
    logs_dir = "logs"
    if not os.path.exists(logs_dir):
        os.makedirs(logs_dir)

    # Configure logging
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
        handlers=[
            # Console handler
            logging.StreamHandler(),
            # File handler
            logging.FileHandler(os.path.join(logs_dir, "crawler.log")),
        ],
    )


setup_logging()