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use std::sync::Arc;
use std::collections::HashMap;
use std::collections::hash_map;

use service::Service;
use solicit::header::Headers;
use data_or_trailers::HttpStreamAfterHeaders;
use resp::Response;



#[derive(Default)]
struct Node {
    service: Option<Arc<Service>>,
    children: HashMap<String, Node>,
}

impl Node {
    fn add_service(&mut self, path: &str, service: Arc<Service>) {
        match split_path(path) {
            None => {
                self.service = Some(service);
            }
            Some((first, rem)) => {
                let node = match self.children.entry(first.to_owned()) {
                    hash_map::Entry::Occupied(e) => e.into_mut(),
                    hash_map::Entry::Vacant(e) => e.insert(Node {
                        service: None,
                        children: HashMap::new(),
                    }),
                };
                node.add_service(rem, service);
            }
        }
    }

    fn remove_service(&mut self, path: &str) -> Option<Arc<Service>> {
        match split_path(path) {
            None => {
                self.service.take()
            }
            Some((first, rem)) => {
                match self.children.get_mut(first) {
                    Some(child) => {
                        child.remove_service(rem)
                    }
                    None => None,
                }
            }
        }
    }

    fn find_service(&self, path: &str) -> Option<&Service> {
        if let Some((first, rem)) = split_path(path) {
            if let Some(node) = self.children.get(first) {
                if let Some(service) = node.find_service(rem) {
                    return Some(service);
                }
            }
        }

        self.service.as_ref().map(|a| a.as_ref())
    }
}

fn split_path<'a>(mut path: &'a str) -> Option<(&'a str, &'a str)> {
    path = path.trim_left_matches('/');

    if path.is_empty() {
        None
    } else {
        let slash = path.find('/');
        match slash {
            Some(slash) => {
                Some((&path[..slash], &path[slash + 1..]))
            }
            None => {
                Some((path, ""))
            }
        }
    }
}

#[test]
fn test_split_path() {
    assert_eq!(None, split_path(""));
    assert_eq!(None, split_path("/"));
    assert_eq!(Some(("first", "")), split_path("first"));
    assert_eq!(Some(("first", "")), split_path("first/"));
    assert_eq!(Some(("first", "")), split_path("/first"));
    assert_eq!(Some(("first", "")), split_path("/first/"));
    assert_eq!(Some(("first", "second")), split_path("/first/second"));
    assert_eq!(Some(("first", "second/")), split_path("/first/second/"));
    assert_eq!(Some(("first", "second/third")), split_path("/first/second/third"));
    assert_eq!(Some(("first", "second/third/")), split_path("/first/second/third/"));
}


/// Convient implementation of `Service` which allows delegation to
/// multiple `Service` implementations provided by user.
#[derive(Default)]
pub struct ServicePaths {
    root: Node,
}

impl ServicePaths {
    /// Create a new `Service` implementation which returns `404`
    /// on all requests by default.
    pub fn new() -> ServicePaths {
        Default::default()
    }

    /// Register a service for given path.
    ///
    /// ```
    /// # use std::sync::Arc;
    /// use httpbis::*;
    ///
    /// struct Root {}
    /// struct Files {}
    ///
    /// impl Service for Root {
    ///     fn start_request(&self, _headers: Headers, _req: HttpStreamAfterHeaders) -> Response {
    ///         Response::found_200_plain_text("This is root page")
    ///     }
    /// }
    ///
    /// impl Service for Files {
    ///     fn start_request(&self, _headers: Headers, _req: HttpStreamAfterHeaders) -> Response {
    ///         Response::found_200_plain_text("This is files")
    ///     }
    /// }
    ///
    /// let mut server = ServerBuilder::new_plain();
    /// server.service.set_service("/", Arc::new(Root{}));
    /// server.service.set_service("/files", Arc::new(Files{}));
    /// ```
    pub fn set_service(&mut self, path: &str, service: Arc<Service>) {
        assert!(path.starts_with("/"));
        self.root.add_service(path, service);
    }

    pub fn set_service_fn<F>(&mut self, path: &str, service: F)
        where F : Fn(Headers, HttpStreamAfterHeaders) -> Response + Send + Sync + 'static
    {
        impl<F : Fn(Headers, HttpStreamAfterHeaders) -> Response + Send + Sync + 'static> Service for F {
            fn start_request(&self, headers: Headers, req: HttpStreamAfterHeaders) -> Response {
                self(headers, req)
            }
        }

        self.set_service(path, Arc::new(service))
    }

    pub fn remove_service(&mut self, path: &str) ->Option<Arc<Service>> {
        assert!(path.starts_with("/"));
        self.root.remove_service(path)
    }

    fn find_service(&self, path: &str) -> Option<&Service> {
        self.root.find_service(path)
    }
}

impl Service for ServicePaths {
    fn start_request(&self, headers: Headers, req: HttpStreamAfterHeaders) -> Response {
        if let Some(service) = self.find_service(headers.path()) {
            service.start_request(headers, req)
        } else {
            Response::not_found_404()
        }
    }
}