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use rapira::{Rapira, RapiraError};
use serde::Serialize;
#[cfg(feature = "ts-types")]
use specta::{DataType, DefOpts, Type};
#[cfg(feature = "ts-types")]
use typescript_type_def::{
    type_expr::{DefinedTypeInfo, Ident, TypeDefinition, TypeExpr, TypeInfo, TypeIntersection},
    TypeDef,
};

use crate::{Cid, Record};

#[derive(Clone, Debug, Serialize)]
pub struct Entry<Val>
where
    Val: Record,
{
    #[serde(flatten)]
    pub key: Val::SelfId,
    #[serde(flatten)]
    pub val: Val,
}

impl<Val> Entry<Val>
where
    Val: Record,
{
    pub fn new(key: Val::SelfId, val: Val) -> Self {
        Entry { key, val }
    }

    pub fn get_id(self) -> Val::SelfId {
        self.key
    }
    pub fn get_val(&self) -> &Val {
        &self.val
    }
    pub fn split(self) -> (Val::SelfId, Val) {
        let Entry { key, val } = self;
        (key, val)
    }
}

impl<Val> From<(Val::SelfId, Val)> for Entry<Val>
where
    Val: Record,
{
    fn from(tuple: (Val::SelfId, Val)) -> Self {
        Entry::new(tuple.0, tuple.1)
    }
}

const fn a_b_size(a: Option<usize>, b: Option<usize>) -> Option<usize> {
    match a {
        Some(s) => match b {
            Some(ss) => Some(s + ss),
            None => None,
        },
        None => None,
    }
}

impl<Val> Rapira for Entry<Val>
where
    Val: Record,
    <Val::SelfId as Cid>::B: Rapira,
{
    const STATIC_SIZE: Option<usize> =
        a_b_size(Val::STATIC_SIZE, <Val::SelfId as Cid>::B::STATIC_SIZE);

    fn size(&self) -> usize {
        match Self::STATIC_SIZE {
            Some(s) => s,
            // None => self.key.bytes().as_ref().len(),
            None => self.key.encode().size() + self.val.size(),
        }
    }

    fn check_bytes(slice: &mut &[u8]) -> rapira::Result<()> {
        <Val::SelfId as Cid>::B::check_bytes(slice)?;
        Val::check_bytes(slice)?;
        Ok(())
    }

    fn from_slice_unchecked(slice: &mut &[u8]) -> rapira::Result<Self>
    where
        Self: Sized,
    {
        let key = <Val::SelfId as Cid>::B::from_slice_unchecked(slice)?;
        let key = <Val::SelfId>::from_bytes(key.as_ref())
            .map_err(|_| RapiraError::OtherError("Cid::from_bytes error"))?;
        let val = Val::from_slice_unchecked(slice)?;
        Ok(Entry::new(key, val))
    }

    fn from_slice(slice: &mut &[u8]) -> rapira::Result<Self>
    where
        Self: Sized,
    {
        let key = <Val::SelfId as Cid>::B::from_slice(slice)?;
        let key = <Val::SelfId>::from_bytes(key.as_ref())
            .map_err(|_| RapiraError::OtherError("Entry Cid error"))?;
        let val = Val::from_slice(slice)?;
        Ok(Entry::new(key, val))
    }

    unsafe fn from_slice_unsafe(slice: &mut &[u8]) -> rapira::Result<Self>
    where
        Self: Sized,
    {
        let key = <Val::SelfId as Cid>::B::from_slice_unsafe(slice)?;
        let key = <Val::SelfId>::from_bytes_unsafe(key.as_ref());
        let val = Val::from_slice_unsafe(slice)?;
        Ok(Entry::new(key, val))
    }

    fn convert_to_bytes(&self, slice: &mut [u8], cursor: &mut usize) {
        self.key.encode().convert_to_bytes(slice, cursor);
        self.val.convert_to_bytes(slice, cursor);
    }

    fn try_convert_to_bytes(&self, slice: &mut [u8], cursor: &mut usize) -> rapira::Result<()> {
        self.key.encode().try_convert_to_bytes(slice, cursor)?;
        self.val.try_convert_to_bytes(slice, cursor)?;
        Ok(())
    }
}

// #[cfg(feature = "ts-types")]
// impl<Val> Type for Entry<Val>
// where
//     Val: Record ,
// {
//     const NAME: &'static str = "Entry";
//     fn inline(_: DefOpts, _: &[DataType]) -> DataType {}
// }

#[cfg(feature = "ts-types")]
impl<Val> TypeDef for Entry<Val>
where
    Self: 'static,
    Val: Record + TypeDef,
    Val::SelfId: TypeDef,
{
    const INFO: TypeInfo = TypeInfo::Defined(DefinedTypeInfo {
        def: TypeDefinition {
            docs: None,
            path: &[],
            name: Ident("Entry"),
            generic_vars: &[Ident("T"), Ident("Id")],
            def: TypeExpr::Intersection(TypeIntersection {
                docs: None,
                members: &[TypeExpr::Ref(&Val::SelfId::INFO), TypeExpr::Ref(&Val::INFO)],
            }),
        },
        generic_args: &[],
    });
}