from fastapi import FastAPI, Depends, HTTPException
from sqlalchemy.orm import Session
from pydantic import BaseModel
from typing import Optional, List
import sys
import os

sys.path.append(os.path.join(os.path.dirname(__file__), "../../../shared"))
from database.connection import get_db
from database.models import GameSession, Player, GameAnswer, Question
from utils.scoring import ScoringEngine
from websocket.socket_manager import socket_manager

app = FastAPI(title="Game Service", version="1.0.0")


class StartGameRequest(BaseModel):
    player_name: str


class AnswerSubmissionRequest(BaseModel):
    session_id: int
    question_id: int
    answer: str
    hint_used: bool = False


class GameSessionResponse(BaseModel):
    id: int
    player_id: int
    total_score: int
    questions_answered: int
    time_remaining: Optional[int] = None
    current_question: Optional[dict] = None


@app.get("/health")
def health_check():
    return {"status": "healthy", "service": "game-service"}


@app.post("/start", response_model=GameSessionResponse)
def start_game(request: StartGameRequest, db: Session = Depends(get_db)):
    player = db.query(Player).filter(Player.name == request.player_name).first()
    if not player:
        player = Player(name=request.player_name)
        db.add(player)
        db.commit()
        db.refresh(player)
    
    session = GameSession(player_id=player.id)
    db.add(session)
    db.commit()
    db.refresh(session)
    
    return GameSessionResponse(
        id=session.id,
        player_id=session.player_id,
        total_score=session.total_score,
        questions_answered=session.questions_answered,
        time_remaining=ScoringEngine.get_max_session_duration()
    )


@app.post("/answer")
async def submit_answer(request: AnswerSubmissionRequest, db: Session = Depends(get_db)):
    session = db.query(GameSession).filter(GameSession.id == request.session_id).first()
    if not session:
        raise HTTPException(status_code=404, detail="Game session not found")
    
    question = db.query(Question).filter(Question.id == request.question_id).first()
    if not question:
        raise HTTPException(status_code=404, detail="Question not found")
    
    existing_attempts = db.query(GameAnswer).filter(
        GameAnswer.session_id == request.session_id,
        GameAnswer.question_id == request.question_id
    ).count()
    
    if existing_attempts >= ScoringEngine.MAX_ATTEMPTS:
        raise HTTPException(status_code=400, detail="Maximum attempts reached")
    
    attempt_number = existing_attempts + 1
    is_correct = request.answer.lower().strip() == question.correct_answer.lower().strip()
    points = ScoringEngine.calculate_points(is_correct, request.hint_used, attempt_number)
    
    answer = GameAnswer(
        session_id=request.session_id,
        question_id=request.question_id,
        attempt_number=attempt_number,
        user_answer=request.answer,
        is_correct=is_correct,
        hint_used=request.hint_used,
        points_earned=points
    )
    
    db.add(answer)
    
    if is_correct:
        session.total_score += points
        session.questions_answered += 1
    
    db.commit()
    
    # Notify real-time subscribers
    try:
        player_name = session.player.name if session.player else "Unknown"
        await socket_manager.notify_answer_submitted(
            session_id=request.session_id,
            player_name=player_name,
            is_correct=is_correct,
            points_earned=points,
            total_score=session.total_score
        )
    except Exception as e:
        print(f"WebSocket notification failed: {e}")
    
    return {
        "correct": is_correct,
        "points_earned": points,
        "attempts_remaining": ScoringEngine.MAX_ATTEMPTS - attempt_number,
        "total_score": session.total_score
    }


@app.get("/session/{session_id}")
def get_game_session(session_id: int, db: Session = Depends(get_db)):
    session = db.query(GameSession).filter(GameSession.id == session_id).first()
    if not session:
        raise HTTPException(status_code=404, detail="Game session not found")
    
    return GameSessionResponse(
        id=session.id,
        player_id=session.player_id,
        total_score=session.total_score,
        questions_answered=session.questions_answered
    )


@app.get("/leaderboard")
def get_leaderboard(db: Session = Depends(get_db)):
    result = db.execute("""
        SELECT p.name as player_name, gs.total_score, gs.questions_answered, gs.ended_at
        FROM game_sessions gs
        JOIN players p ON gs.player_id = p.id
        WHERE gs.ended_at IS NOT NULL
        ORDER BY gs.total_score DESC, gs.ended_at ASC
        LIMIT 10
    """).fetchall()
    
    return [
        {
            "player_name": row.player_name,
            "score": row.total_score,
            "questions_answered": row.questions_answered,
            "completed_at": row.ended_at
        }
        for row in result
    ]


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8001)