CREATE TABLE users (
    id uuid PRIMARY KEY REFERENCES auth.users ON DELETE CASCADE,
    is_admin boolean NOT NULL DEFAULT false,
    created_at timestamp with time zone NOT NULL DEFAULT now(),
    updated_at timestamp with time zone NOT NULL DEFAULT now()
);

CREATE TRIGGER users_handle_updated_at
AFTER UPDATE ON users
FOR EACH ROW EXECUTE FUNCTION handle_updated_at();

-- Auto-create users when auth.users are created
CREATE FUNCTION handle_new_user()
RETURNS trigger
LANGUAGE plpgsql
    SECURITY DEFINER
    SET search_path = ''
AS $$
BEGIN
    INSERT INTO public.users (id)
    VALUES (NEW.id);
    RETURN NEW;
END;
$$;

CREATE TRIGGER users_handle_new_user 
AFTER INSERT ON auth.users
FOR EACH ROW EXECUTE FUNCTION handle_new_user();

-- Table to store users' favourite study spaces
CREATE TABLE favourite_study_spaces (
    user_id uuid REFERENCES users(id) ON DELETE CASCADE,
    study_space_id uuid REFERENCES study_spaces(id) ON DELETE CASCADE,
    created_at timestamp with time zone DEFAULT now(),
    updated_at timestamp with time zone DEFAULT now(),
    PRIMARY KEY (user_id, study_space_id)
);

CREATE TRIGGER favourite_study_spaces_updated_at
AFTER UPDATE ON favourite_study_spaces
FOR EACH ROW EXECUTE FUNCTION handle_updated_at();