import uuid

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth.deps import get_current_user
from app.auth.hashing import hash_password, verify_password
from app.auth.jwt import create_token
from app.database import get_db
from app.models.schemas import (
    RegisterRequest,
    LoginRequest,
    TokenResponse,
    UserResponse,
    CollectionCreate,
    CollectionResponse,
)
from app.models.user import User
from app.models.collection import Collection

router = APIRouter(prefix="/api", tags=["auth"])


@router.post("/register", response_model=TokenResponse, status_code=status.HTTP_201_CREATED)
async def register(body: RegisterRequest, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == body.email))
    if result.scalar_one_or_none():
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Email already registered")

    api_key = str(uuid.uuid4().hex[:32])
    user = User(
        email=body.email,
        password_hash=hash_password(body.password),
        api_key=api_key,
        plan=body.plan,
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)

    return TokenResponse(access_token=create_token(user.id))


@router.post("/login", response_model=TokenResponse)
async def login(body: LoginRequest, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == body.email))
    user = result.scalar_one_or_none()
    if not user or not verify_password(body.password, user.password_hash):
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials")

    return TokenResponse(access_token=create_token(user.id))


@router.get("/me", response_model=UserResponse)
async def get_me(user: User = Depends(get_current_user)):
    return user


@router.post("/collections", response_model=CollectionResponse, status_code=status.HTTP_201_CREATED)
async def create_collection(
    body: CollectionCreate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    collection = Collection(user_id=user.id, name=body.name)
    db.add(collection)
    await db.commit()
    await db.refresh(collection)
    return collection


@router.get("/collections", response_model=list[CollectionResponse])
async def list_collections(
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Collection).where(Collection.user_id == user.id).order_by(Collection.created_at.desc())
    )
    return result.scalars().all()


@router.get("/collections/{collection_id}", response_model=CollectionResponse)
async def get_collection(
    collection_id: uuid.UUID,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Collection).where(Collection.id == collection_id, Collection.user_id == user.id)
    )
    collection = result.scalar_one_or_none()
    if not collection:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Collection not found")
    return collection


@router.delete("/collections/{collection_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_collection(
    collection_id: uuid.UUID,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Collection).where(Collection.id == collection_id, Collection.user_id == user.id)
    )
    collection = result.scalar_one_or_none()
    if not collection:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Collection not found")

    await db.delete(collection)
    await db.commit()