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use std::prelude::v1::*;

use serde::{ Deserialize, Serialize };
use std::fmt::{ Debug, Formatter };
use std::collections::BTreeMap;
use std::sync::Arc;
use matchit::{ Router };
use parking_lot::Mutex;
use crate::RegistryFeature;


#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Features {
    feature_map: BTreeMap<String, crate::RegistryFeature>,
    #[serde(skip)]
    feature_router: Router<String>,
    feature_fallback: Option<String>
}

impl Features {
    pub fn new() -> Self {
        Self {
            feature_map: BTreeMap::new(),
            feature_router: Router::new(),
            feature_fallback: None
        }
    }

    pub async fn add(&mut self, feature_arc: Arc<dyn crate::Feature>, base_path: String, router: &mut product_os_router::ProductOSRouter) {
        let registry_feature = feature_arc.register(feature_arc.clone(), base_path, router).await;
        let identifier = registry_feature.identifier.clone();
        self.feature_map.insert(identifier.clone(), registry_feature);

        match feature_arc.init_feature().await {
            Ok(_) => {}
            Err(_) => {}
        }

        self.setup_router();
    }

    pub async fn add_mut(&mut self, feature_arc_mut: Arc<Mutex<dyn crate::Feature>>, base_path: String, router: &mut product_os_router::ProductOSRouter) {
        let feature_locked = feature_arc_mut.try_lock_for(core::time::Duration::new(10, 0));

        match feature_locked {
            Some(mut feature_mut) => {
                let registry_feature = feature_mut.register_mut(feature_arc_mut.clone(), base_path, router).await;
                let identifier = registry_feature.identifier.clone();
                self.feature_map.insert(identifier.clone(), registry_feature);

                match feature_mut.init_feature_mut().await {
                    Ok(_) => {}
                    Err(_) => {}
                }

                self.setup_router();
            }
            None => panic!("Failed to lock mut feature")
        }
    }

    pub fn remove(&mut self, identifier: String) {
        self.feature_map.remove(identifier.as_str());

        self.setup_router();
    }

    pub fn get(&self, identifier: &str) -> Option<&RegistryFeature> {
        self.feature_map.get(identifier)
    }

    pub fn find(&self, path: &str) -> Option<(&RegistryFeature, BTreeMap<String, String>)> {
        match self.feature_router.at(path) {
            Ok(result) => {
                match self.get(result.value.as_str()) {
                    None => None,
                    Some(registry_feature) => {
                        let mut parameters = BTreeMap::new();

                        for (key, value) in result.params.iter() {
                            parameters.insert(key.to_string(), value.to_string());
                        }

                        Some((registry_feature, parameters))
                    }
                }
            },
            Err(_) => {
                match &self.feature_fallback {
                    None => None,
                    Some(id) => {
                        let mut parameters = BTreeMap::new();

                        parameters.insert("*path".to_string(), path.to_string());

                        Some((self.feature_map.get(id.as_str()).unwrap(), parameters))
                    }
                }
            }
        }
    }

    pub fn setup_router(&mut self) {
        self.feature_router = Router::new();
        self.feature_fallback = None;

        for (identifier, registry_feature) in self.feature_map.iter() {
            for path in &registry_feature.paths {
                if path.starts_with("/*") {
                    if self.feature_fallback == None {
                        self.feature_fallback = Some(identifier.to_owned())
                    }
                    else {
                        panic!("Issue setting fallback router {} - fallback already defined", identifier)
                    }
                }
                else {
                    match self.feature_router.insert(path, identifier.clone()) {
                        Ok(_) => {}
                        Err(e) => panic!("Issue inserting path for identifier {}: {} - {}", identifier, path, e)
                    }
                }
            }
        }
    }
}


impl Debug for Features {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{:?}", self.feature_map)
    }
}