from datetime import timedelta

from fastapi import Depends, FastAPI, HTTPException, status
from fastapi.middleware.cors import CORSMiddleware
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from services.user_service.models import User
from services.user_service.schemas import (
    Token,
    UserCreate,
    UserLogin,
    UserResponse,
    UserUpdate,
)
from shared.auth import (
    create_access_token,
    get_current_user_from_token,
    get_password_hash,
    verify_password,
)
from shared.config import settings
from shared.database import get_db

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

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


async def get_current_user(
    user_data: dict = Depends(get_current_user_from_token),
    db: AsyncSession = Depends(get_db),
):
    """Get current user from token via auth dependency."""
    # Get full user object from database
    result = await db.execute(select(User).filter(User.id == user_data["user_id"]))
    user = result.scalars().first()
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
        )
    return user


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy", "service": "user_service"}


@app.post("/api/v1/register", response_model=UserResponse)
async def register_user(user_data: UserCreate, db: AsyncSession = Depends(get_db)):
    """Register a new user"""
    # Check if user already exists
    result = await db.execute(select(User).filter(User.email == user_data.email))
    if result.scalars().first():
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="Email already registered"
        )

    # Create new user
    hashed_password = get_password_hash(user_data.password)
    db_user = User(
        email=user_data.email,
        phone=user_data.phone,
        password_hash=hashed_password,
        first_name=user_data.first_name,
        last_name=user_data.last_name,
        date_of_birth=user_data.date_of_birth,
        bio=user_data.bio,
    )

    db.add(db_user)
    await db.commit()
    await db.refresh(db_user)

    return UserResponse.model_validate(db_user)


@app.post("/api/v1/login", response_model=Token)
async def login(user_credentials: UserLogin, db: AsyncSession = Depends(get_db)):
    """Authenticate user and return token"""
    result = await db.execute(select(User).filter(User.email == user_credentials.email))
    user = result.scalars().first()

    if not user or not verify_password(user_credentials.password, user.password_hash):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
        )

    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Account is deactivated",
        )

    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": str(user.id), "email": user.email},
        expires_delta=access_token_expires,
    )

    return {"access_token": access_token, "token_type": "bearer"}


@app.get("/api/v1/profile", response_model=UserResponse)
async def get_profile(current_user: User = Depends(get_current_user)):
    """Get current user profile"""
    return UserResponse.model_validate(current_user)


@app.put("/api/v1/profile", response_model=UserResponse)
async def update_profile(
    user_update: UserUpdate,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Update user profile"""
    update_data = user_update.model_dump(exclude_unset=True)

    for field, value in update_data.items():
        setattr(current_user, field, value)

    await db.commit()
    await db.refresh(current_user)

    return UserResponse.model_validate(current_user)


@app.get("/api/v1/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy", "service": "user-service"}


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=8001)