import asyncio
import logging
import uuid
import re
from contextlib import asynccontextmanager
from datetime import datetime, timedelta
from typing import cast, Callable
import secrets
from dotenv import load_dotenv
load_dotenv()

from sqlalchemy.orm import Session
from sqlalchemy import func
from fastapi import FastAPI, Depends, HTTPException, status, WebSocket, WebSocketDisconnect, Request
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded

from database import get_db
from database_functions import fill_card_pool, check_boosters, BOOSTER_MAX
from models import Card as CardModel
from models import User as UserModel
from models import Deck as DeckModel
from models import DeckCard as DeckCardModel
from auth import (
  hash_password, verify_password, create_access_token, create_refresh_token,
  decode_access_token, decode_refresh_token
)
from game_manager import (
    queue, queue_lock, QueueEntry, try_match, handle_action, connections, active_games,
    serialize_state, handle_disconnect, handle_timeout_claim, load_deck_cards, create_solo_game
)
from trade_manager import (
    trade_queue, trade_queue_lock, TradeQueueEntry, try_trade_match,
    handle_trade_action, active_trades, handle_trade_disconnect,
    serialize_trade,
)
from card import compute_deck_type, _get_specific_card_async
from email_utils import send_password_reset_email, send_verification_email
from config import CORS_ORIGINS, STRIPE_SECRET_KEY, STRIPE_PUBLISHABLE_KEY, STRIPE_WEBHOOK_SECRET, FRONTEND_URL
import stripe
stripe.api_key = STRIPE_SECRET_KEY

logger = logging.getLogger("app")

# Auth
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

class RegisterRequest(BaseModel):
  username: str
  email: str
  password: str

def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> UserModel:
  user_id = decode_access_token(token)
  if not user_id:
    raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
  user = db.query(UserModel).filter(UserModel.id == uuid.UUID(user_id)).first()
  if not user:
    raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found")
  return user

class ForgotPasswordRequest(BaseModel):
  email: str

class ResetPasswordWithTokenRequest(BaseModel):
  token: str
  new_password: str

@asynccontextmanager
async def lifespan(app: FastAPI):
  asyncio.create_task(fill_card_pool())
  yield

app = FastAPI(lifespan=lifespan)

# Rate limiting
limiter = Limiter(key_func=get_remote_address)
app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, cast(Callable, _rate_limit_exceeded_handler))

app.add_middleware(
  CORSMiddleware,
  allow_origins=CORS_ORIGINS,  # SvelteKit's default dev port
  allow_methods=["*"],
  allow_headers=["*"],
)

try:
  from disposable_email_domains import blocklist as _disposable_blocklist
except ImportError:
  _disposable_blocklist: set[str] = set()

def validate_register(username: str, email: str, password: str) -> str | None:
  if not username.strip():
    return "Username is required"
  if len(username) > 16:
    return "Username must be 16 characters or fewer"
  if not re.match(r"^[^\s@]+@[^\s@]+\.[^\s@]+$", email):
    return "Please enter a valid email"
  domain = email.split("@")[-1].lower()
  if domain in _disposable_blocklist:
    return "Disposable email addresses are not allowed"
  if len(password) < 8:
    return "Password must be at least 8 characters"
  if len(password) > 256:
    return "Password must be 256 characters or fewer"
  return None

@app.post("/register")
def register(req: RegisterRequest, db: Session = Depends(get_db)):
  err = validate_register(req.username, req.email, req.password)
  if err:
    raise HTTPException(status_code=400, detail=err)
  if db.query(UserModel).filter(UserModel.username == req.username).first():
    raise HTTPException(status_code=400, detail="Username already taken")
  if db.query(UserModel).filter(UserModel.email == req.email).first():
    raise HTTPException(status_code=400, detail="Email already registered")
  verification_token = secrets.token_urlsafe(32)
  user = UserModel(
    id=uuid.uuid4(),
    username=req.username,
    email=req.email,
    password_hash=hash_password(req.password),
    email_verified=False,
    email_verification_token=verification_token,
    email_verification_token_expires_at=datetime.now() + timedelta(hours=24),
  )
  db.add(user)
  db.commit()
  try:
    send_verification_email(req.email, req.username, verification_token)
  except Exception as e:
    logger.error(f"Failed to send verification email: {e}")
  return {"message": "Account created. Please check your email to verify your account."}

@app.post("/login")
def login(form: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
  user = db.query(UserModel).filter(UserModel.username == form.username).first()
  if not user or not verify_password(form.password, user.password_hash):
    raise HTTPException(status_code=400, detail="Invalid username or password")
  return {
    "access_token": create_access_token(str(user.id)),
    "refresh_token": create_refresh_token(str(user.id)),
    "token_type": "bearer",
  }

@app.get("/boosters")
def get_boosters(user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  count, countdown = check_boosters(user, db)
  return {"count": count, "countdown": countdown, "email_verified": user.email_verified}

@app.get("/cards")
def get_cards(user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  cards = db.query(CardModel).filter(CardModel.user_id == user.id).all()
  return [
    {**{c.name: getattr(card, c.name) for c in card.__table__.columns},
      "card_rarity": card.card_rarity,
      "card_type": card.card_type}
    for card in cards
  ]

@app.post("/open_pack")
@limiter.limit("10/minute")
async def open_pack(request: Request, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  if not user.email_verified:
    raise HTTPException(status_code=403, detail="You must verify your email before opening packs")

  check_boosters(user, db)

  if user.boosters == 0:
    raise HTTPException(status_code=400, detail="No booster packs available")

  cards = (
    db.query(CardModel)
    .filter(CardModel.user_id == None, CardModel.ai_used == False)
    .limit(5)
    .all()
  )

  if len(cards) < 5:
    asyncio.create_task(fill_card_pool())
    raise HTTPException(status_code=503, detail="Card pool is low, please try again shortly")

  for card in cards:
    card.user_id = user.id

  was_full = user.boosters == BOOSTER_MAX
  user.boosters -= 1
  if was_full:
    user.boosters_countdown = datetime.now()

  db.commit()

  asyncio.create_task(fill_card_pool())

  return [
    {**{c.name: getattr(card, c.name) for c in card.__table__.columns},
      "card_rarity": card.card_rarity,
      "card_type": card.card_type}
    for card in cards
  ]

@app.get("/decks")
def get_decks(user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  decks = db.query(DeckModel).filter(
    DeckModel.user_id == user.id,
    DeckModel.deleted == False
  ).order_by(DeckModel.created_at).all()
  result = []
  for deck in decks:
    card_ids = [dc.card_id for dc in db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).all()]
    cards = db.query(CardModel).filter(CardModel.id.in_(card_ids)).all()
    result.append({
      "id": str(deck.id),
      "name": deck.name,
      "card_count": len(cards),
      "total_cost": sum(card.cost for card in cards),
      "times_played": deck.times_played,
      "wins": deck.wins,
      "losses": deck.losses,
      "deck_type": compute_deck_type(cards),
    })
  return result

@app.post("/decks")
def create_deck(user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  count = db.query(DeckModel).filter(DeckModel.user_id == user.id).count()
  deck = DeckModel(id=uuid.uuid4(), user_id=user.id, name=f"Deck #{count + 1}")
  db.add(deck)
  db.commit()
  return {"id": str(deck.id), "name": deck.name, "card_count": 0}

@app.patch("/decks/{deck_id}")
def update_deck(deck_id: str, body: dict, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  deck = db.query(DeckModel).filter(DeckModel.id == uuid.UUID(deck_id), DeckModel.user_id == user.id).first()
  if not deck:
    raise HTTPException(status_code=404, detail="Deck not found")
  if "name" in body:
    deck.name = body["name"]
  if "card_ids" in body:
    db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).delete()
    for card_id in body["card_ids"]:
      db.add(DeckCardModel(deck_id=deck.id, card_id=uuid.UUID(card_id)))
    if deck.times_played > 0:
      deck.wins = 0
      deck.losses = 0
      deck.times_played = 0
  db.commit()
  return {"id": str(deck.id), "name": deck.name}

@app.delete("/decks/{deck_id}")
def delete_deck(deck_id: str, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  deck = db.query(DeckModel).filter(DeckModel.id == uuid.UUID(deck_id), DeckModel.user_id == user.id).first()
  if not deck:
    raise HTTPException(status_code=404, detail="Deck not found")
  if deck.times_played > 0:
    deck.deleted = True
  else:
    db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).delete()
    db.delete(deck)
  db.commit()
  return {"message": "Deleted"}

@app.get("/decks/{deck_id}/cards")
def get_deck_cards(deck_id: str, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  deck = db.query(DeckModel).filter(DeckModel.id == uuid.UUID(deck_id), DeckModel.user_id == user.id).first()
  if not deck:
    raise HTTPException(status_code=404, detail="Deck not found")
  deck_cards = db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).all()
  return [str(dc.card_id) for dc in deck_cards]

@app.websocket("/ws/queue")
async def queue_endpoint(websocket: WebSocket, deck_id: str, db: Session = Depends(get_db)):
  await websocket.accept()

  token = await websocket.receive_text()
  user_id = decode_access_token(token)
  if not user_id:
    await websocket.close(code=1008)
    return

  deck = db.query(DeckModel).filter(
    DeckModel.id == uuid.UUID(deck_id),
    DeckModel.user_id == uuid.UUID(user_id)
  ).first()

  if not deck:
    await websocket.send_json({"type": "error", "message": "Deck not found"})
    await websocket.close(code=1008)
    return

  card_ids = [dc.card_id for dc in db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).all()]
  total_cost = db.query(func.sum(CardModel.cost)).filter(CardModel.id.in_(card_ids)).scalar() or 0
  if total_cost == 0 or total_cost > 50:
    await websocket.send_json({"type": "error", "message": "Deck total cost must be between 1 and 50"})
    await websocket.close(code=1008)
    return

  entry = QueueEntry(user_id=user_id, deck_id=deck_id, websocket=websocket)

  async with queue_lock:
    queue.append(entry)

  await websocket.send_json({"type": "queued"})
  await try_match(db)

  try:
    while True:
      # Keeping socket alive
      await websocket.receive_text()
  except WebSocketDisconnect:
    async with queue_lock:
      queue[:] = [e for e in queue if e.user_id != user_id]


@app.websocket("/ws/game/{game_id}")
async def game_endpoint(websocket: WebSocket, game_id: str, db: Session = Depends(get_db)):
  await websocket.accept()

  token = await websocket.receive_text()
  user_id = decode_access_token(token)
  if not user_id:
    await websocket.close(code=1008)
    return

  if game_id not in active_games:
    await websocket.close(code=1008)
    return

  # Register this connection (handles reconnects)
  connections[game_id][user_id] = websocket

  # Send current state immediately on connect
  await websocket.send_json({
    "type": "state",
    "state": serialize_state(active_games[game_id], user_id),
  })

  try:
    while True:
      data = await websocket.receive_json()
      await handle_action(game_id, user_id, data, db)
  except WebSocketDisconnect:
    if game_id in connections:
      connections[game_id].pop(user_id, None)
      asyncio.create_task(handle_disconnect(game_id, user_id))

@app.websocket("/ws/trade/queue")
async def trade_queue_endpoint(websocket: WebSocket, db: Session = Depends(get_db)):
  await websocket.accept()

  token = await websocket.receive_text()
  user_id = decode_access_token(token)
  if not user_id:
    await websocket.close(code=1008)
    return

  user = db.query(UserModel).filter(UserModel.id == uuid.UUID(user_id)).first()
  if not user:
    await websocket.close(code=1008)
    return
  if not user.email_verified:
    await websocket.send_json({"type": "error", "message": "You must verify your email before trading."})
    await websocket.close(code=1008)
    return

  entry = TradeQueueEntry(user_id=user_id, username=user.username, websocket=websocket)

  async with trade_queue_lock:
    trade_queue.append(entry)

  await websocket.send_json({"type": "queued"})
  await try_trade_match()

  try:
    while True:
      await websocket.receive_text()
  except WebSocketDisconnect:
    async with trade_queue_lock:
      trade_queue[:] = [e for e in trade_queue if e.user_id != user_id]


@app.websocket("/ws/trade/{trade_id}")
async def trade_endpoint(websocket: WebSocket, trade_id: str, db: Session = Depends(get_db)):
  await websocket.accept()

  token = await websocket.receive_text()
  user_id = decode_access_token(token)
  if not user_id:
    await websocket.close(code=1008)
    return

  session = active_trades.get(trade_id)
  if not session or user_id not in session.offers:
    await websocket.close(code=1008)
    return

  session.connections[user_id] = websocket

  await websocket.send_json({
    "type": "state",
    "state": serialize_trade(session, user_id),
  })

  try:
    while True:
      data = await websocket.receive_json()
      await handle_trade_action(trade_id, user_id, data, db)
  except WebSocketDisconnect:
    session.connections.pop(user_id, None)
    asyncio.create_task(handle_trade_disconnect(trade_id, user_id))


@app.get("/profile")
def get_profile(user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  total_games = user.wins + user.losses

  most_played_deck = (
    db.query(DeckModel)
    .filter(DeckModel.user_id == user.id, DeckModel.times_played > 0)
    .order_by(DeckModel.times_played.desc())
    .first()
  )

  most_played_card = (
    db.query(CardModel)
    .filter(CardModel.user_id == user.id, CardModel.times_played > 0)
    .order_by(CardModel.times_played.desc())
    .first()
  )

  return {
    "username": user.username,
    "email": user.email,
    "email_verified": user.email_verified,
    "created_at": user.created_at,
    "wins": user.wins,
    "losses": user.losses,
    "shards": user.shards,
    "win_rate": round((user.wins / total_games) * 100) if total_games > 0 else None,
    "most_played_deck": {
      "name": most_played_deck.name,
      "times_played": most_played_deck.times_played,
    } if most_played_deck else None,
    "most_played_card": {
      "name": most_played_card.name,
      "times_played": most_played_card.times_played,
      "card_type": most_played_card.card_type,
      "card_rarity": most_played_card.card_rarity,
      "image_link": most_played_card.image_link,
    } if most_played_card else None,
  }

class ShatterRequest(BaseModel):
  card_ids: list[str]

@app.post("/shards/shatter")
def shatter_cards(req: ShatterRequest, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  if not req.card_ids:
    raise HTTPException(status_code=400, detail="No cards selected")
  try:
    parsed_ids = [uuid.UUID(cid) for cid in req.card_ids]
  except ValueError:
    raise HTTPException(status_code=400, detail="Invalid card IDs")

  cards = db.query(CardModel).filter(
    CardModel.id.in_(parsed_ids),
    CardModel.user_id == user.id,
  ).all()

  if len(cards) != len(parsed_ids):
    raise HTTPException(status_code=400, detail="Some cards are not in your collection")

  total = sum(c.cost for c in cards)

  for card in cards:
    db.query(DeckCardModel).filter(DeckCardModel.card_id == card.id).delete()
    db.delete(card)

  user.shards += total
  db.commit()
  return {"shards": user.shards, "gained": total}

# Shard packages sold for real money.
# price_oere is in Danish øre (1 DKK = 100 øre). Stripe minimum is 250 øre.
SHARD_PACKAGES = {
  "s1": {"base": 100,   "bonus": 0,     "shards": 100,    "price_oere": 1000,   "price_label": "10 DKK"},
  "s2": {"base": 250,   "bonus": 50,    "shards": 300,    "price_oere": 2500,   "price_label": "25 DKK"},
  "s3": {"base": 500,   "bonus": 200,   "shards": 700,    "price_oere": 5000,   "price_label": "50 DKK"},
  "s4": {"base": 1000,  "bonus": 600,   "shards": 1600,   "price_oere": 10000,  "price_label": "100 DKK"},
  "s5": {"base": 2500,  "bonus": 2000,  "shards": 4500,   "price_oere": 25000,  "price_label": "250 DKK"},
  "s6": {"base": 5000,  "bonus": 5000,  "shards": 10000,  "price_oere": 50000,  "price_label": "500 DKK"},
}

class StripeCheckoutRequest(BaseModel):
  package_id: str

@app.post("/store/stripe/checkout")
def create_stripe_checkout(req: StripeCheckoutRequest, user: UserModel = Depends(get_current_user)):
  package = SHARD_PACKAGES.get(req.package_id)
  if not package:
    raise HTTPException(status_code=400, detail="Invalid package")
  session = stripe.checkout.Session.create(
    payment_method_types=["card"],
    line_items=[{
      "price_data": {
        "currency": "dkk",
        "product_data": {"name": f"WikiTCG Shards — {package['price_label']}"},
        "unit_amount": package["price_oere"],
      },
      "quantity": 1,
    }],
    mode="payment",
    success_url=f"{FRONTEND_URL}/store?payment=success",
    cancel_url=f"{FRONTEND_URL}/store",
    metadata={"user_id": str(user.id), "shards": str(package["shards"])},
  )
  return {"url": session.url}

@app.post("/stripe/webhook")
async def stripe_webhook(request: Request, db: Session = Depends(get_db)):
  payload = await request.body()
  sig = request.headers.get("stripe-signature", "")
  try:
    event = stripe.Webhook.construct_event(payload, sig, STRIPE_WEBHOOK_SECRET)
  except stripe.error.SignatureVerificationError: # type: ignore
    raise HTTPException(status_code=400, detail="Invalid signature")

  if event["type"] == "checkout.session.completed":
    data = event["data"]["object"]
    user_id = data.get("metadata", {}).get("user_id")
    shards = data.get("metadata", {}).get("shards")
    if user_id and shards:
      user = db.query(UserModel).filter(UserModel.id == uuid.UUID(user_id)).first()
      if user:
        user.shards += int(shards)
        db.commit()

  return {"ok": True}

@app.get("/store/config")
def store_config():
  return {
    "publishable_key": STRIPE_PUBLISHABLE_KEY,
    "shard_packages": SHARD_PACKAGES,
  }

STORE_PACKAGES = {
  1:  15,
  5:  65,
  10: 120,
  25: 260,
}

class StoreBuyRequest(BaseModel):
  quantity: int

class BuySpecificCardRequest(BaseModel):
  wiki_title: str

SPECIFIC_CARD_COST = 1000

@app.post("/store/buy-specific-card")
@limiter.limit("10/hour")
async def buy_specific_card(request: Request, req: BuySpecificCardRequest, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  if user.shards < SPECIFIC_CARD_COST:
    raise HTTPException(status_code=400, detail="Not enough shards")

  card = await _get_specific_card_async(req.wiki_title)
  if card is None:
    raise HTTPException(status_code=404, detail="Could not generate a card for that Wikipedia page")

  db_card = CardModel(
    name=card.name,
    image_link=card.image_link,
    card_rarity=card.card_rarity.name,
    card_type=card.card_type.name,
    text=card.text,
    attack=card.attack,
    defense=card.defense,
    cost=card.cost,
    user_id=user.id,
  )
  db.add(db_card)
  user.shards -= SPECIFIC_CARD_COST
  db.commit()
  db.refresh(db_card)

  return {
    **{c.name: getattr(db_card, c.name) for c in db_card.__table__.columns},
    "card_rarity": db_card.card_rarity,
    "card_type": db_card.card_type,
    "shards": user.shards,
  }

@app.post("/store/buy")
def store_buy(req: StoreBuyRequest, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  cost = STORE_PACKAGES.get(req.quantity)
  if cost is None:
    raise HTTPException(status_code=400, detail="Invalid package")
  if user.shards < cost:
    raise HTTPException(status_code=400, detail="Not enough shards")
  user.shards -= cost
  user.boosters += req.quantity
  db.commit()
  return {"shards": user.shards, "boosters": user.boosters}

@app.post("/cards/{card_id}/report")
def report_card(card_id: str, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
    card = db.query(CardModel).filter(
        CardModel.id == uuid.UUID(card_id),
        CardModel.user_id == user.id
    ).first()
    if not card:
        raise HTTPException(status_code=404, detail="Card not found")
    card.reported = True
    db.commit()
    return {"message": "Card reported"}

@app.post("/cards/{card_id}/refresh")
@limiter.limit("5/hour")
async def refresh_card(request: Request, card_id: str, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  card = db.query(CardModel).filter(
    CardModel.id == uuid.UUID(card_id),
    CardModel.user_id == user.id
  ).first()
  if not card:
    raise HTTPException(status_code=404, detail="Card not found")

  if user.last_refresh_at and datetime.now() - user.last_refresh_at < timedelta(hours=2):
    remaining = (user.last_refresh_at + timedelta(hours=2)) - datetime.now()
    hours = int(remaining.total_seconds() // 3600)
    minutes = int((remaining.total_seconds() % 3600) // 60)
    raise HTTPException(
      status_code=429,
      detail=f"You can refresh again in {hours}h {minutes}m"
    )

  new_card = await _get_specific_card_async(card.name)
  if not new_card:
    raise HTTPException(status_code=502, detail="Failed to regenerate card from Wikipedia")

  card.image_link = new_card.image_link
  card.card_rarity = new_card.card_rarity.name
  card.card_type = new_card.card_type.name
  card.text = new_card.text
  card.attack = new_card.attack
  card.defense = new_card.defense
  card.cost = new_card.cost
  card.reported = False

  user.last_refresh_at = datetime.now()
  db.commit()

  return {
    **{c.name: getattr(card, c.name) for c in card.__table__.columns},
    "card_rarity": card.card_rarity,
    "card_type": card.card_type,
  }

@app.get("/profile/refresh-status")
def refresh_status(user: UserModel = Depends(get_current_user)):
  if not user.last_refresh_at:
    return {"can_refresh": True, "next_refresh_at": None}
  next_refresh = user.last_refresh_at + timedelta(hours=2)
  can_refresh = datetime.now() >= next_refresh
  return {
    "can_refresh": can_refresh,
    "next_refresh_at": next_refresh.isoformat() if not can_refresh else None,
  }

@app.post("/game/{game_id}/claim-timeout-win")
async def claim_timeout_win(game_id: str, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  err = await handle_timeout_claim(game_id, str(user.id), db)
  if err:
    raise HTTPException(status_code=400, detail=err)
  return {"message": "Win claimed"}

@app.post("/game/solo")
async def start_solo_game(deck_id: str, difficulty: int = 5, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  if difficulty < 1 or difficulty > 10:
    raise HTTPException(status_code=400, detail="Difficulty must be between 1 and 10")

  deck = db.query(DeckModel).filter(
    DeckModel.id == uuid.UUID(deck_id),
    DeckModel.user_id == user.id
  ).first()
  if not deck:
    raise HTTPException(status_code=404, detail="Deck not found")

  card_ids = [dc.card_id for dc in db.query(DeckCardModel).filter(DeckCardModel.deck_id == deck.id).all()]
  total_cost = db.query(func.sum(CardModel.cost)).filter(CardModel.id.in_(card_ids)).scalar() or 0
  if total_cost == 0 or total_cost > 50:
    raise HTTPException(status_code=400, detail="Deck total cost must be between 1 and 50")

  player_cards = load_deck_cards(deck_id, str(user.id), db)
  if player_cards is None:
    raise HTTPException(status_code=503, detail="Couldn't load deck")

  ai_cards = db.query(CardModel).filter(
    CardModel.user_id == None,
  ).order_by(func.random()).limit(500).all()

  if len(ai_cards) == 0:
    raise HTTPException(status_code=503, detail="Not enough cards in pool for AI deck")

  for card in ai_cards:
    card.ai_used = True
  db.commit()

  game_id = create_solo_game(str(user.id), user.username, player_cards, ai_cards, deck_id, difficulty)
  asyncio.create_task(fill_card_pool())

  return {"game_id": game_id}

class ResetPasswordRequest(BaseModel):
  current_password: str
  new_password: str

@app.post("/auth/reset-password")
def reset_password(req: ResetPasswordRequest, user: UserModel = Depends(get_current_user), db: Session = Depends(get_db)):
  if not verify_password(req.current_password, user.password_hash):
    raise HTTPException(status_code=400, detail="Current password is incorrect")
  if len(req.new_password) < 8:
    raise HTTPException(status_code=400, detail="Password must be at least 8 characters")
  if len(req.new_password) > 256:
    raise HTTPException(status_code=400, detail="Password must be 256 characters or fewer")
  if req.current_password == req.new_password:
    raise HTTPException(status_code=400, detail="New password must be different from current password")
  user.password_hash = hash_password(req.new_password)
  db.commit()
  return {"message": "Password updated"}

@app.post("/auth/forgot-password")
def forgot_password(req: ForgotPasswordRequest, db: Session = Depends(get_db)):
  user = db.query(UserModel).filter(UserModel.email == req.email).first()
  # Always return success even if email not found. Prevents user enumeration
  if user:
    token = secrets.token_urlsafe(32)
    user.reset_token = token
    user.reset_token_expires_at = datetime.now() + timedelta(hours=1)
    db.commit()
    try:
      send_password_reset_email(user.email, user.username, token)
    except Exception as e:
      logger.error(f"Failed to send reset email: {e}")
  return {"message": "If that email is registered you will receive a reset link shortly"}

@app.post("/auth/reset-password-with-token")
def reset_password_with_token(req: ResetPasswordWithTokenRequest, db: Session = Depends(get_db)):
  user = db.query(UserModel).filter(UserModel.reset_token == req.token).first()
  if not user or not user.reset_token_expires_at or user.reset_token_expires_at < datetime.now():
    raise HTTPException(status_code=400, detail="Invalid or expired reset link")
  if len(req.new_password) < 8:
    raise HTTPException(status_code=400, detail="Password must be at least 8 characters")
  if len(req.new_password) > 256:
    raise HTTPException(status_code=400, detail="Password must be 256 characters or fewer")
  user.password_hash = hash_password(req.new_password)
  user.reset_token = None
  user.reset_token_expires_at = None
  db.commit()
  return {"message": "Password updated"}

@app.get("/auth/verify-email")
def verify_email(token: str, db: Session = Depends(get_db)):
  user = db.query(UserModel).filter(UserModel.email_verification_token == token).first()
  if not user or not user.email_verification_token_expires_at or user.email_verification_token_expires_at < datetime.now():
    raise HTTPException(status_code=400, detail="Invalid or expired verification link")
  user.email_verified = True
  user.email_verification_token = None
  user.email_verification_token_expires_at = None
  db.commit()
  return {"message": "Email verified"}

class ResendVerificationRequest(BaseModel):
  email: str

@app.post("/auth/resend-verification")
def resend_verification(req: ResendVerificationRequest, db: Session = Depends(get_db)):
  user = db.query(UserModel).filter(UserModel.email == req.email).first()
  # Always return success to prevent user enumeration
  if user and not user.email_verified:
    token = secrets.token_urlsafe(32)
    user.email_verification_token = token
    user.email_verification_token_expires_at = datetime.now() + timedelta(hours=24)
    db.commit()
    try:
      send_verification_email(user.email, user.username, token)
    except Exception as e:
      logger.error(f"Failed to resend verification email: {e}")
  return {"message": "If that email is registered and unverified, you will receive a new verification link shortly"}

class RefreshRequest(BaseModel):
  refresh_token: str

@app.post("/auth/refresh")
def refresh(req: RefreshRequest, db: Session = Depends(get_db)):
  user_id = decode_refresh_token(req.refresh_token)
  if not user_id:
    raise HTTPException(status_code=401, detail="Invalid or expired refresh token")
  user = db.query(UserModel).filter(UserModel.id == uuid.UUID(user_id)).first()
  if not user:
    raise HTTPException(status_code=401, detail="User not found")
  return {
    "access_token": create_access_token(str(user.id)),
    "refresh_token": create_refresh_token(str(user.id)),
    "token_type": "bearer",
  }

if __name__ == "__main__":
  from ai import AIPersonality, choose_cards
  from card import generate_cards, Card
  from time import sleep

  all_cards = generate_cards(500)

  all_cards.sort(key=lambda x: x.cost, reverse=True)

  print(len(all_cards))
  def write_cards(cards: list[Card], file: str):
    with open(file, "w") as fp:
      fp.write('\n'.join([
        f"{c.name} - {c.attack}/{c.defense} - {c.cost}"
        for c in cards
      ]))

  write_cards(all_cards, "output/all.txt")

  for personality in AIPersonality:
    print(personality.value)
    for difficulty in range(1,11):
      chosen_cards = choose_cards(all_cards, difficulty, personality)
      chosen_cards.sort(key=lambda x: x.cost, reverse=True)
      write_cards(chosen_cards, f"output/{personality.value}-{difficulty}.txt")