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use std::collections::BTreeMap;
use information::InformationAssociator;
use information::InformationProvider;
use information::InformationOrganizer;

pub struct BTreeMapGraphInformation<TInformation> {
    information: BTreeMap<usize, TInformation>,
}

impl <TInformation> BTreeMapGraphInformation<TInformation> {
    pub fn new() -> Self {
        BTreeMapGraphInformation{ information: BTreeMap::<usize, TInformation>::new() }
    }

    fn take_information_option(&mut self, vertex_id: usize) -> Option<TInformation> {
        self.information.remove(&vertex_id)
    }
}

impl <TInformation> InformationAssociator<TInformation> for BTreeMapGraphInformation<TInformation> {
    fn add_information(&mut self, vertex_id: usize, information: TInformation) {
        self.information.insert(vertex_id, information);
    }

    fn remove_information(&mut self, vertex_id: usize) {
        self.information.remove(&vertex_id);
    }
}

impl <TInformation> InformationProvider<TInformation> for BTreeMapGraphInformation<TInformation> {
    fn get_all_information(&self) -> Vec<&TInformation> {
        let information = &self.information;
        information
            .values()
            .collect()
    }

    fn get_all_information_mut<'a>(&'a mut self) -> Vec<&'a mut TInformation> {
        let information = &mut self.information;
        information
            .iter_mut()
            .map(
                |item| {
                    let (_, value) = item;
                    value
                }
            )
            .collect()
    }

    fn get_information(&self, vertex_id: usize) -> &TInformation {
        self.information.get(&vertex_id).unwrap()
    }

    fn get_information_mut<'a>(&'a mut self, vertex_id: usize) -> &'a mut TInformation {
        self.information.get_mut(&vertex_id).unwrap()
    }
}

impl <TInformation> InformationOrganizer for BTreeMapGraphInformation<TInformation> {
    fn reorganize_information(&mut self, new_vertex_id_layout: &Vec<usize>) {
        let mut new_information = BTreeMap::<usize, TInformation>::new();

        let old_vertex_ids: Vec<usize> = self.information.keys().cloned().collect();
        for old_vertex_id in old_vertex_ids {
            let information_option = self.take_information_option(old_vertex_id);
            if let Some(information) = information_option {
                let new_vertex_id = new_vertex_id_layout[old_vertex_id];
                new_information.insert(new_vertex_id, information);
            }
        }

        self.information = new_information
    }
}