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use information::GeneralInformationAssociator;
use information::InformationOrganizer;
use information::GeneralInformationProvider;
use std::any::Any;
use std::mem;

pub trait GeneralGraphInformation:
    GeneralInformationAssociator +
    InformationOrganizer +
    GeneralInformationProvider {
}

impl <T> GeneralGraphInformation for T
    where T: GeneralInformationAssociator +
             InformationOrganizer +
             GeneralInformationProvider {
}

impl GeneralGraphInformation {
    pub fn add_information<TInformation>(&mut self, vertex_id: usize, information: TInformation)
        where TInformation: Any {
        let self_as_base = unsafe { mem::transmute::<&mut GeneralGraphInformation, &mut GeneralInformationAssociator>(self) };
        let mut information_option = Some(information);
        self_as_base.add_information(vertex_id, &mut information_option);
    }

    pub fn get_all_information<TInformation>(&self) -> Vec<&TInformation>
        where TInformation: Any {
        let self_as_base = unsafe { mem::transmute::<&GeneralGraphInformation, &GeneralInformationProvider>(self) };
        self_as_base
            .get_all_information()
            .into_iter()
            .map(
                |information| {
                    let result = information.downcast_ref::<TInformation>();
                    result.expect("You attempted to cast something from an information provider into an invalid type. Aborting.")
                }
            )
            .collect()
    }

    pub fn get_all_information_mut<'a, TInformation>(&'a mut self) -> Vec<&'a mut TInformation>
        where TInformation: Any {
        let self_as_base = unsafe { mem::transmute::<&mut GeneralGraphInformation, &mut GeneralInformationProvider>(self) };
        self_as_base
            .get_all_information_mut()
            .into_iter()
            .map(
                |information| {
                    let result = information.downcast_mut::<TInformation>();
                    result.expect("You attempted to cast something from an information provider into an invalid type. Aborting.")
                }
            )
            .collect()
    }

    pub fn get_information<TInformation>(&self, vertex_id: usize) -> &TInformation
        where TInformation: Any {
        let self_as_base = unsafe { mem::transmute::<&GeneralGraphInformation, &GeneralInformationProvider>(self) };
        let result = self_as_base.get_information(vertex_id).downcast_ref::<TInformation>();
        result.expect("You attempted to cast something from an information provider into an invalid type. Aborting.")
    }

    pub fn get_information_mut<'a, TInformation>(&'a mut self, vertex_id: usize) -> &'a mut TInformation
        where TInformation: Any {
        let self_as_base = unsafe { mem::transmute::<&mut GeneralGraphInformation, &mut GeneralInformationProvider>(self) };
        let result = self_as_base.get_information_mut(vertex_id).downcast_mut::<TInformation>();
        result.expect("You attempted to cast something from an information provider into an invalid type. Aborting.")
    }
}