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extern crate fraction;
extern crate num;

use self::fraction::BigFraction;
use self::num::BigInt;

use std::collections::HashMap;
use std::hash::Hash;

use crate::book::extractor::pointer::Pointer;

pub trait FromPointer<'a>: Sized {
    fn from_pointer(pointer: Pointer<'a>) -> Option<Self>;
}

macro_rules! from_pointer_impl {
    ($t:ty) => {
        impl<'a> FromPointer<'a> for $t /* where &'a Word: Into<Result<$t, &'a Word>> */ {
            fn from_pointer(pointer: Pointer<'a>) -> Option<Self> {
                pointer.into::<$t>()
            }
        }
    };

    (link $t:ty) => {
        impl<'a> FromPointer<'a> for &'a $t /* where &'a Word: Into<Result<&'a $t, &'a Word>> */ {
            fn from_pointer(pointer: Pointer<'a>) -> Option<Self> {
                pointer.into::<&'a $t>()
            }
        }
    };
}

from_pointer_impl!(());

from_pointer_impl!(bool);

from_pointer_impl!(char);
from_pointer_impl! (link str);
from_pointer_impl!(String);

from_pointer_impl!(f32);
from_pointer_impl!(f64);

from_pointer_impl!(BigFraction);
from_pointer_impl! (link BigFraction);

from_pointer_impl!(u8);
from_pointer_impl!(i8);
from_pointer_impl!(u16);
from_pointer_impl!(i16);
from_pointer_impl!(u32);
from_pointer_impl!(i32);
from_pointer_impl!(u64);
from_pointer_impl!(i64);
from_pointer_impl!(usize);
from_pointer_impl!(isize);

from_pointer_impl!(BigInt);
from_pointer_impl! (link BigInt);

from_pointer_impl!(Vec<u8>);
from_pointer_impl! (link Vec<u8>);

pub trait List<'a>: Sized {
    fn list_new() -> Self;

    fn list_reserve(&mut self, size: usize);

    fn list_update(&mut self, val: Pointer<'a>);
}

impl<'a, V> List<'a> for Vec<V>
where
    V: FromPointer<'a>,
{
    fn list_new() -> Self {
        Vec::new()
    }

    fn list_reserve(&mut self, size: usize) {
        self.reserve_exact(size);
    }

    fn list_update(&mut self, val: Pointer<'a>) {
        if let Some(v) = <V as FromPointer>::from_pointer(val) {
            self.push(v);
        }
    }
}

pub trait Dict<'a>: Sized {
    fn dict_new() -> Self;

    fn dict_reserve(&mut self, size: usize);

    fn dict_update(&mut self, key: Pointer<'a>, val: Pointer<'a>);
}

impl<'a, K, V> Dict<'a> for HashMap<K, V>
where
    K: FromPointer<'a> + Eq + Hash,
    V: FromPointer<'a>,
{
    fn dict_new() -> Self {
        HashMap::new()
    }

    fn dict_reserve(&mut self, size: usize) {
        self.reserve(size)
    }

    fn dict_update(&mut self, key: Pointer<'a>, val: Pointer<'a>) {
        if let Some(k) = <K as FromPointer>::from_pointer(key) {
            if let Some(v) = <V as FromPointer>::from_pointer(val) {
                self.insert(k, v);
            }
        }
    }
}