from sqlalchemy import func, select
from sqlalchemy.orm import Session

from app.models.module import Module


class ModulesRepository:
    def __init__(self, db: Session) -> None:
        self.db = db

    def get_by_key(self, module_key: str) -> Module | None:
        stmt = select(Module).where(Module.module_key == module_key)
        return self.db.scalar(stmt)

    def list(self, limit: int = 200, offset: int = 0) -> tuple[list[Module], int]:
        stmt = select(Module)
        count_stmt = select(func.count()).select_from(Module)
        stmt = stmt.order_by(Module.created_at.desc()).limit(limit).offset(offset)
        return list(self.db.scalars(stmt).all()), int(self.db.scalar(count_stmt) or 0)

    def create(self, module_key: str, system_key: str, name: str, status: str = "active") -> Module:
        item = Module(module_key=module_key, system_key=system_key, name=name, status=status)
        self.db.add(item)
        self.db.commit()
        self.db.refresh(item)
        return item

    def update(self, item: Module, *, name: str | None = None, status: str | None = None) -> Module:
        if name is not None:
            item.name = name
        if status is not None:
            item.status = status
        self.db.commit()
        self.db.refresh(item)
        return item