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use super::bundlepack::{BundlePack, Constraint};
use std::collections::HashMap;
use std::fmt::Debug;

pub trait BundleStore: Debug {
    fn push(&mut self, bp: &BundlePack);
    fn remove(&mut self, bid: String) -> Option<BundlePack>;
    fn count(&self) -> u64;
    fn all_ids(&self) -> Vec<String>;
    fn has_item(&self, bp: &BundlePack) -> bool;
    fn pending(&self) -> Vec<&BundlePack>;
    fn ready(&self) -> Vec<&BundlePack>;
    fn forwarding(&self) -> Vec<&BundlePack>;
    fn bundles(&self) -> Vec<&BundlePack>;
    fn bundles_status(&self) -> Vec<String> {
        self.bundles().iter().map(|bp| bp.to_string()).collect()
    }
}

#[derive(Debug, Clone, PartialEq)]
pub struct SimpleBundleStore {
    bundles: HashMap<String, BundlePack>,
}

impl BundleStore for SimpleBundleStore {
    fn push(&mut self, bp: &BundlePack) {
        // TODO: check for duplicates, update, remove etc
        let entry = self.bundles.entry(bp.id().to_string()).or_insert_with(|| bp.clone());
        *entry = bp.clone();
    }
    fn remove(&mut self, bid: String) -> Option<BundlePack> {
        self.bundles.remove(&bid)
    }
    fn count(&self) -> u64 {
        self.bundles.len() as u64
    }
    fn all_ids(&self) -> Vec<String> {
        self.bundles.keys().cloned().collect()
    }
    fn has_item(&self, bp: &BundlePack) -> bool {
        self.bundles.contains_key(&bp.id().to_string())
    }
    fn pending(&self) -> Vec<&BundlePack> {
        self.bundles
            .values()
            .filter(|&e| {
                !e.has_constraint(Constraint::ReassemblyPending)
                    && e.has_constraint(Constraint::Contraindicated)
            })
            .collect::<Vec<&BundlePack>>()
    }
    fn ready(&self) -> Vec<&BundlePack> {
        self.bundles
            .values()
            .filter(|&e| {
                !e.has_constraint(Constraint::ReassemblyPending)
                    && !e.has_constraint(Constraint::Contraindicated)
            })
            .collect::<Vec<&BundlePack>>()
    }
    fn forwarding(&self) -> Vec<&BundlePack> {
        self.bundles
            .values()
            .filter(|&e| e.has_constraint(Constraint::ForwardPending))
            .collect::<Vec<&BundlePack>>()
    }
    fn bundles(&self) -> Vec<&BundlePack> {
        self.bundles.values().collect()
    }
}

impl Default for SimpleBundleStore {
    fn default() -> Self {
        SimpleBundleStore::new()
    }
}
impl SimpleBundleStore {
    pub fn new() -> SimpleBundleStore {
        SimpleBundleStore {
            bundles: HashMap::new(),
        }
    }
}