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use leptos::*;

pub enum UseRwSignal<T: 'static> {
    Separate(Signal<T>, WriteSignal<T>),
    Combined(RwSignal<T>),
}

impl<T> From<RwSignal<T>> for UseRwSignal<T> {
    fn from(s: RwSignal<T>) -> Self {
        Self::Combined(s)
    }
}

impl<T, RS> From<(RS, WriteSignal<T>)> for UseRwSignal<T>
where
    RS: Into<Signal<T>>,
{
    fn from(s: (RS, WriteSignal<T>)) -> Self {
        Self::Separate(s.0.into(), s.1)
    }
}

impl<T> Default for UseRwSignal<T>
where
    T: Default,
{
    fn default() -> Self {
        Self::Combined(Default::default())
    }
}

impl<T> Clone for UseRwSignal<T> {
    fn clone(&self) -> Self {
        *self
    }
}

impl<T> Copy for UseRwSignal<T> {}

impl<T> SignalGet for UseRwSignal<T>
where
    T: Clone,
{
    type Value = T;

    fn get(&self) -> T {
        match self {
            Self::Separate(s, _) => s.get(),
            Self::Combined(s) => s.get(),
        }
    }

    fn try_get(&self) -> Option<T> {
        match self {
            Self::Separate(s, _) => s.try_get(),
            Self::Combined(s) => s.try_get(),
        }
    }
}

impl<T> SignalGetUntracked for UseRwSignal<T>
where
    T: Clone,
{
    type Value = T;

    fn get_untracked(&self) -> T {
        match self {
            Self::Separate(s, _) => s.get_untracked(),
            Self::Combined(s) => s.get_untracked(),
        }
    }

    fn try_get_untracked(&self) -> Option<T> {
        match self {
            Self::Separate(s, _) => s.try_get_untracked(),
            Self::Combined(s) => s.try_get_untracked(),
        }
    }
}

impl<T> SignalWith for UseRwSignal<T> {
    type Value = T;

    fn with<R>(&self, f: impl FnOnce(&T) -> R) -> R {
        match self {
            Self::Separate(s, _) => s.with(f),
            Self::Combined(s) => s.with(f),
        }
    }

    fn try_with<R>(&self, f: impl FnOnce(&T) -> R) -> Option<R> {
        match self {
            Self::Separate(s, _) => s.try_with(f),
            Self::Combined(s) => s.try_with(f),
        }
    }
}

impl<T> SignalWithUntracked for UseRwSignal<T> {
    type Value = T;

    fn with_untracked<R>(&self, f: impl FnOnce(&T) -> R) -> R {
        match self {
            Self::Separate(s, _) => s.with_untracked(f),
            Self::Combined(s) => s.with_untracked(f),
        }
    }

    fn try_with_untracked<R>(&self, f: impl FnOnce(&T) -> R) -> Option<R> {
        match self {
            Self::Separate(s, _) => s.try_with_untracked(f),
            Self::Combined(s) => s.try_with_untracked(f),
        }
    }
}

impl<T> SignalSet for UseRwSignal<T> {
    type Value = T;

    fn set(&self, new_value: T) {
        match *self {
            Self::Separate(_, s) => s.set(new_value),
            Self::Combined(s) => s.set(new_value),
        }
    }

    fn try_set(&self, new_value: T) -> Option<T> {
        match *self {
            Self::Separate(_, s) => s.try_set(new_value),
            Self::Combined(s) => s.try_set(new_value),
        }
    }
}

impl<T> SignalSetUntracked<T> for UseRwSignal<T> {
    fn set_untracked(&self, new_value: T) {
        match self {
            Self::Separate(_, s) => s.set_untracked(new_value),
            Self::Combined(s) => s.set_untracked(new_value),
        }
    }

    fn try_set_untracked(&self, new_value: T) -> Option<T> {
        match self {
            Self::Separate(_, s) => s.try_set_untracked(new_value),
            Self::Combined(s) => s.try_set_untracked(new_value),
        }
    }
}

impl<T> SignalUpdate for UseRwSignal<T> {
    type Value = T;

    fn update(&self, f: impl FnOnce(&mut T)) {
        match self {
            Self::Separate(_, s) => s.update(f),
            Self::Combined(s) => s.update(f),
        }
    }

    fn try_update<O>(&self, f: impl FnOnce(&mut T) -> O) -> Option<O> {
        match self {
            Self::Separate(_, s) => s.try_update(f),
            Self::Combined(s) => s.try_update(f),
        }
    }
}