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use crate::error::Error;
use serde::{Deserialize, Serialize};
use std::borrow::Cow;

pub trait IntoClones<Tuple>: Clone {
    fn into_clones(self) -> Tuple;
}

macro_rules! impl_into_clones {
    // [@clones(self) T (...)] => [(... self,)]
    [@clones($self:ident) $h:ident ($($code:tt)*)] => { ($($code)* $self,) };
    // [@clones(self) T T ... T (...)] => [@clones(self) T ... T (... self.clone(),)]
    [@clones($self:ident) $h:ident $($t:ident)+ ($($code:tt)*)] => {
        impl_into_clones![
            @clones($self) $($t)+ ($($code)* $self.clone(),)
        ]
    };
    {$h:ident $($t:ident)*} => {
        impl<$h: Clone> IntoClones<($h $(, $t)*,)> for $h {
            fn into_clones(self) -> ($h $(, $t)*,) {
                // [@clones(self) T T ... T ()]
                impl_into_clones![@clones(self) $h $($t)* ()]
            }
        }
        impl_into_clones!{$($t)*}
    };
    () => {};
}

impl_into_clones! {T T T T T T T T T T T}

#[macro_export]
macro_rules! tuple_from_box_api {
    ($f:path [ $($args:expr),* , @out ]) => {
        {
            let mut result = ::std::mem::MaybeUninit::uninit();
            #[allow(unused_unsafe)]
            unsafe {
                if $f($($args),*, result.as_mut_ptr()) < 0 {
                    return Err($crate::error::TarantoolError::last().into());
                }
                Ok($crate::tuple::Tuple::try_from_ptr(result.assume_init()))
            }
        }
    }
}

#[macro_export]
macro_rules! expr_count {
    () => { 0 };
    ($head:expr $(, $tail:expr)*) => { 1 + $crate::expr_count!($($tail),*) }
}

#[inline]
pub fn rmp_to_vec<T>(val: &T) -> Result<Vec<u8>, Error>
where
    T: Serialize + ?Sized,
{
    Ok(rmp_serde::to_vec(val)?)
}

#[derive(Clone, Debug, Serialize, Deserialize, tlua::Push, PartialEq, Eq)]
#[serde(untagged)]
pub enum NumOrStr {
    Num(u32),
    // TODO(gmoshkin): this should be a `&str` instead, but
    // `#[derive(tlua::Push)]` doesn't support generic parameters yet
    Str(String),
}

impl Default for NumOrStr {
    fn default() -> Self {
        Self::Num(0)
    }
}

impl From<u32> for NumOrStr {
    #[inline(always)]
    fn from(n: u32) -> Self {
        Self::Num(n)
    }
}

impl From<String> for NumOrStr {
    #[inline(always)]
    fn from(s: String) -> Self {
        Self::Str(s)
    }
}

impl From<NumOrStr> for String {
    #[inline(always)]
    fn from(s: NumOrStr) -> Self {
        match s {
            NumOrStr::Str(s) => s,
            NumOrStr::Num(n) => n.to_string(),
        }
    }
}

impl<'a> From<&'a str> for NumOrStr {
    #[inline(always)]
    fn from(s: &'a str) -> Self {
        Self::Str(s.into())
    }
}

#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Hash)]
#[serde(untagged)]
pub enum Value<'a> {
    Num(u32),
    Str(Cow<'a, str>),
    Bool(bool),
}

#[rustfmt::skip]
impl From<bool> for Value<'_> { fn from(v: bool) -> Self { Self::Bool(v) } }
#[rustfmt::skip]
impl From<u32> for Value<'_> { fn from(v: u32) -> Self { Self::Num(v) } }
#[rustfmt::skip]
impl From<String> for Value<'_> { fn from(v: String) -> Self { Self::Str(v.into()) } }
#[rustfmt::skip]
impl<'s> From<&'s str> for Value<'s> { fn from(v: &'s str) -> Self { Self::Str(v.into()) } }

#[macro_export]
macro_rules! unwrap_or {
    ($o:expr, $else:expr) => {
        if let Some(v) = $o {
            v
        } else {
            $else
        }
    };
}

#[macro_export]
macro_rules! unwrap_ok_or {
    ($o:expr, $err:pat => $($else:tt)+) => {
        match $o {
            Ok(v) => v,
            $err => $($else)+,
        }
    }
}