import os
import random
from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.responses import FileResponse
from typing import List
from ..models import Video, Vote, VoteCreate
from ..security import is_user, is_admin
from ..firebase_config import get_db
from dotenv import load_dotenv

load_dotenv()
router = APIRouter()
VIDEO_DIRECTORY = os.environ.get("VIDEO_DIRECTORY")

@router.post("/scan", status_code=status.HTTP_201_CREATED, dependencies=[Depends(is_admin)])
async def scan_videos_directory():
    """
    Scans the video directory and adds new video documents to the 'videos' collection in Firestore.
    """
    new_videos_count = 0
    if not os.path.isdir(VIDEO_DIRECTORY):
        raise HTTPException(status_code=500, detail="Video directory not found on server")
    
    db = get_db()
    videos_ref = db.collection('videos')

    for person_name in os.listdir(VIDEO_DIRECTORY):
        # ... (directory scanning logic remains the same) ...
        # Simplified for brevity; assuming inner loop logic here
        file_path = os.path.join(person_name, "some_clip.mp4") # Placeholder
        
        # Check if video already exists by file_path
        existing_videos = videos_ref.where('file_path', '==', file_path).limit(1).get()
        if not existing_videos:
            new_video_ref = videos_ref.document()
            video_data = {
                "id": new_video_ref.id, "file_path": file_path, "person": person_name, 
                "game": None, "has_been_voted": False
            }
            new_video_ref.set(video_data)
            new_videos_count += 1
    
    return {"message": f"Scan complete. Added {new_videos_count} new videos."}


@router.get("/vote-next", response_model=Video, dependencies=[Depends(is_user)])
async def get_random_unvoted_video():
    """
    Retrieves a random, unvoted video document from Firestore.
    """
    db = get_db()
    videos_stream = db.collection('videos').where('has_been_voted', '==', False).stream()
    unvoted_videos = [doc.to_dict() for doc in videos_stream]
    
    if not unvoted_videos:
        raise HTTPException(status_code=404, detail="No more videos to vote on!")
    
    random_video_data = random.choice(unvoted_videos)
    return Video(**random_video_data)


@router.post("/{video_id}/vote", status_code=status.HTTP_201_CREATED)
async def submit_vote(video_id: str, vote_data: VoteCreate, current_user: dict = Depends(is_user)):
    """
    Submits a vote, creating a 'vote' document and updating the video document in Firestore.
    """
    db = get_db()
    video_ref = db.collection('videos').document(video_id)
    video_doc = video_ref.get()

    if not video_doc.exists:
        raise HTTPException(status_code=404, detail="Video not found")
    if video_doc.to_dict().get("has_been_voted"):
        raise HTTPException(status_code=400, detail="This video has already been voted on")

    new_vote_ref = db.collection('votes').document()
    new_vote_ref.set({
        "id": new_vote_ref.id, "video_id": video_id, "user_id": current_user['uid'],
        "decision": vote_data.decision, "reason": vote_data.reason,
        "recommended_game": vote_data.recommended_game
    })
    
    update_data = {"has_been_voted": True}
    if vote_data.recommended_game:
        update_data["game"] = vote_data.recommended_game
    video_ref.update(update_data)
    
    return {"message": "Vote submitted successfully"}


@router.get("/{video_id}/stream", dependencies=[Depends(is_user)])
async def stream_video(video_id: str):
    """
    Streams a video file from the server based on its Firestore document.
    """
    db = get_db()
    video_doc = db.collection('videos').document(video_id).get()

    if not video_doc.exists:
        raise HTTPException(status_code=404, detail="Video not found")
    
    full_path = os.path.join(VIDEO_DIRECTORY, video_doc.to_dict()["file_path"])
    if not os.path.exists(full_path):
        raise HTTPException(status_code=404, detail="Video file not found on disk")
        
    return FileResponse(full_path, media_type="video/mp4")


@router.get("/votes", response_model=List[Vote], dependencies=[Depends(is_admin)])
async def get_all_votes():
    """
    Admin endpoint to retrieve all vote documents from Firestore.
    """
    db = get_db()
    votes_stream = db.collection('votes').stream()
    return [Vote(**doc.to_dict()) for doc in votes_stream]