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use std::fmt::Debug;
use std::marker::PhantomData;
use std::sync::Arc;

use tide::Route;

/// [Variadic-argument][] route versioning is implemented via this struct for [`From<T>`][] with Single-argument, Tuple, and Vec types.
///
/// This allows [`preroll::main!`][crate::main!] and [`preroll::test_utils::create_client`][crate::test_utils::create_client] to version routes automatically based on their position in the arguments list.
///
/// Examples of what can be provided to any function that accepts `impl Into<VariadicRoutes>`, assuming all arguments are `Fn(Route<'r, Arc<State>>)`:
/// - A single routes function argument.
///     - Will become `/api/v1`.
///     - E.g. `routes_v1` or `routes_setup`.
/// - A [Tuple][] of 1 to 4 routes functions.
///     - Will become `/api/v1` through `/api/v4`.
///     - E.g. `(routes_v1, routes_v2, routes_v3)`
/// - A [Vec][] of boxed routes functions.
///     - If you need this you may want to reconsider your architecture!
///     - Will become `/api/v{N}` where N is the index + 1.
///     - E.g. `vec![Box::new(routes_v1), Box::new(routes_v2)]`
///
/// [`From<T>`]: https://doc.rust-lang.org/std/convert/trait.From.html
/// [Tuple]: https://doc.rust-lang.org/std/primitive.tuple.html
/// [Variadic-argument]: https://en.wikipedia.org/wiki/Variadic_function
/// [Vec]: https://doc.rust-lang.org/std/vec/struct.Vec.html
#[allow(clippy::type_complexity)]
#[allow(missing_debug_implementations)]
pub struct VariadicRoutes<State>
where
    State: Send + Sync + 'static,
{
    _phantom_state: PhantomData<*const State>,
    pub routes: Vec<Box<dyn for<'r> Fn(Route<'r, Arc<State>>)>>,
}

impl<State, RoutesFn> From<RoutesFn> for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
    RoutesFn: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
{
    fn from(routes: RoutesFn) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes: vec![Box::new(routes)],
        }
    }
}

// For completeness only
impl<State, RoutesFn> From<(RoutesFn,)> for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
    RoutesFn: for<'r> Fn(Route<'r, Arc<State>>) + Debug + 'static,
{
    fn from(routes: (RoutesFn,)) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes: vec![Box::new(routes.0)],
        }
    }
}

impl<State, RoutesFn1, RoutesFn2> From<(RoutesFn1, RoutesFn2)> for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
    RoutesFn1: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn2: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
{
    fn from(routes: (RoutesFn1, RoutesFn2)) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes: vec![Box::new(routes.0), Box::new(routes.1)],
        }
    }
}

impl<State, RoutesFn1, RoutesFn2, RoutesFn3> From<(RoutesFn1, RoutesFn2, RoutesFn3)>
    for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
    RoutesFn1: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn2: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn3: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
{
    fn from(routes: (RoutesFn1, RoutesFn2, RoutesFn3)) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes: vec![Box::new(routes.0), Box::new(routes.1), Box::new(routes.2)],
        }
    }
}

impl<State, RoutesFn1, RoutesFn2, RoutesFn3, RoutesFn4>
    From<(RoutesFn1, RoutesFn2, RoutesFn3, RoutesFn4)> for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
    RoutesFn1: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn2: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn3: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
    RoutesFn4: for<'r> Fn(Route<'r, Arc<State>>) + 'static,
{
    fn from(routes: (RoutesFn1, RoutesFn2, RoutesFn3, RoutesFn4)) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes: vec![
                Box::new(routes.0),
                Box::new(routes.1),
                Box::new(routes.2),
                Box::new(routes.3),
            ],
        }
    }
}

// If you have api versioning beyond ... I don't know... 5?? you probably should reconsider your architecture!!
#[allow(clippy::type_complexity)]
impl<State> From<Vec<Box<dyn for<'r> Fn(Route<'r, Arc<State>>)>>> for VariadicRoutes<State>
where
    State: Send + Sync + 'static,
{
    fn from(routes: Vec<Box<dyn for<'r> Fn(Route<'r, Arc<State>>)>>) -> Self {
        VariadicRoutes {
            _phantom_state: PhantomData,
            routes,
        }
    }
}