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    use async_session::{Result, Session, SessionStore};
    use anyhow::anyhow;
    use async_trait::async_trait;
    use std::{
        fs,
        path::Path,
    };
    use walkdir::{DirEntry, WalkDir};
    use binascii::bin2hex;

    #[allow(unused)]
    fn is_hidden(entry: &DirEntry) -> bool {
        entry.file_name()
            .to_str()
            .map(|s| s.starts_with("."))
            .unwrap_or(false)
    }
    #[derive(Debug, Clone)]
    pub struct FileStore {
        pub sess_path: String,
        pub ses_file: String,
    }
    #[async_trait]
    impl SessionStore for FileStore {
        async fn load_session(&self, cookie_value: String) -> Result<Option<Session>> {
            let id = Session::id_from_cookie_value(&cookie_value)?;
            log::trace!("loading session by id `{}`", &id);
            //dbg!("loading session by id `{}`", &id);
            self.load_session_file(&id).await
        }
        async fn store_session(&self, session: Session) -> Result<Option<String>> {
            log::trace!("storing session by id `{}`", session.id());
            let id_filename = match self.get_path(session.id()) {
                Ok(res) => res,
                Err(e) => {
                    return Err(e);
                }
            };
            // let mut out_buffer = [0u8; 100];
            // let id_filename = if let Ok(res) = bin2hex(session.id().as_bytes(),&mut out_buffer) {
            //    std::str::from_utf8(res)?.to_owned()
            // } else {
            //    return Ok(None);
            // };
            let sess_id_path = format!("{}/{}", self.sess_path, &id_filename);
            if ! Path::new(&sess_id_path).exists() {
                fs::create_dir(&sess_id_path)?;
            }
            let content_session = serde_json::to_string(&session)?;
            fs::write(&format!("{}/{}",&sess_id_path, self.ses_file), content_session)?;
            //session.reset_data_changed(); // do not need is it is serialized in file write
            Ok(session.into_cookie_value())
        }
        async fn destroy_session(&self, session: Session) -> Result {
            log::trace!("destroying session by id `{}`", session.id());
            match self.get_path(session.id()) {
                Ok(res) => match self.get_session_id_path(&res) {
                    Ok(session_id_path) => Ok(fs::remove_file(&session_id_path)?),
                    Err(e) => Err(e),
                },
                Err(e) => Err(e)
            }
            // let mut out_buffer = [0u8; 100];
            // if let Ok(res) = bin2hex(session.id().as_bytes(),&mut out_buffer) {
            //     let id_filename = std::str::from_utf8(res)?.to_owned();
            //     Ok(fs::remove_file(
            //         &format!("{}/{}/{}",self.sess_path, &id_filename, self.ses_file)
            //     )?)
            // } else {
            //     Ok(())
            // }
        }
        async fn clear_store(&self) -> Result {
            log::trace!("clearing memory store");
            let sess_path = format!("{}", self.sess_path);
            fs::remove_dir_all(&sess_path)?;
            fs::create_dir(&sess_path)?;
            Ok(())
        }
    }
    impl FileStore {
        /// Create a new instance of FilesStore
        pub fn check_paths(&self) -> Result {
            if ! Path::new(&self.sess_path).exists() {
                fs::create_dir(&self.sess_path)?;
            }
            Ok(())
        }
        pub fn get_path(&self,id: &str) -> Result<String> {
            let mut out_buffer = [0u8; 100];
            match bin2hex(&id.as_bytes(),&mut out_buffer) {
                Ok(res) => Ok(std::str::from_utf8(res)?.to_owned()),
                Err(e) => {
                    Err(anyhow!("Filename path {} not generated: {:?}", &id, &e))
                }
            }
        }
        pub fn get_session_id_path(&self,id_filename: &str) -> Result<String> {
            let session_id_path = format!("{}/{}/{}",self.sess_path, id_filename, &self.ses_file);
            if ! Path::new(&session_id_path).exists() {
               Err(anyhow!("Filename path {} not found: {}", id_filename, &session_id_path ))
            } else {
                Ok(session_id_path)
            }
        }
        /// As session Id from `async_session` comes in base64 it will be not valid for OS filename
        /// `bin2hex` pass id to hex as bytes and from there to string or viceversa
        pub async fn load_session_file(&self, id: &str) -> Result<Option<Session>> {
            let session_id_path = match self.get_path(id) {
                Ok(res) => match self.get_session_id_path(&res) {
                    Ok(path) => path,
                    Err(e) => return Err(e),
                },
                Err(e) => {
                    return Err(e);
                }
            };
            // let mut out_buffer = [0u8; 100];
            // let id_filename = if let Ok(res) = bin2hex(&id.as_bytes(),&mut out_buffer) {
            //    std::str::from_utf8(res)?.to_owned()
            // } else {
            //    return Ok(None);
            // };
            // let session_id_path = format!("{}/{}/{}",self.sess_path, &id_filename, &self.ses_file);
            // dbg!(&session_id_path);
            if ! Path::new(&session_id_path).exists() {
                dbg!("No path: {}", &session_id_path);
                // let sess_id_path = format!("{}/{}", self.sess_path, &id_filename);
                // if ! Path::new(&sess_id_path).exists() {
                //     fs::create_dir(&sess_id_path)?;
                // }
                // create
            }
            if let Ok(session_content) = fs::read_to_string(&session_id_path) {
                // match serde_json::from_str::<serde_json::Value>(&session_content) {
                match serde_json::from_str::<Session>(&session_content) {
                    Ok(session) => {
                        Ok(session.validate())
                    },
                    Err(e) => {
                        dbg!("Error loading session content from {}: {}",&session_id_path, e);
                        //log::error!("Error loading session content from {}: {}",&session_id_path, e);
                        Ok(None)
                    }
                }
            } else {
                Ok(None)
            }
        }
        #[allow(dead_code)]
        pub async fn cleanup(&self) -> Result {
            log::trace!("cleaning up file store...");
            let mut count: usize = 0;
            let sess_path = format!("{}", self.sess_path);
            let walker = WalkDir::new(&sess_path).into_iter();
            for entry in walker.filter_entry(|e| !is_hidden(e)) {
                match entry {
                    Ok(dir_entry) => {
                        // println!("{}", &dir_entry.path().display());
                        if ! Path::new(&dir_entry.path()).is_dir() {
                            continue;
                        }
                        let session_file = format!("{}/{}",&dir_entry.path().display(), &self.ses_file);
                        let id_path = format!("{}",&dir_entry.path().display());
                        let id = id_path.replace(&sess_path,"");
                        if let Some(session) = self.load_session_file(&id).await.unwrap_or_default() {
                            if session.is_expired() {
                                let _ = fs::remove_file(&session_file);
                                log::trace!("found {} expired session",&id_path);
                                count +=1;
                            }
                        }
                    },
                    Err(e) =>  println!("Error on {}: {}", &sess_path, e)
                }
            }
            log::trace!("found {} expired session {} cleaned",&sess_path, count);
            Ok(())
        }
        #[allow(dead_code)]
        pub async fn count(&self) -> usize {
            let mut count: usize = 0;
            let sess_path = format!("{}", self.sess_path);
            let walker = WalkDir::new(&sess_path).into_iter();
            for entry in walker.filter_entry(|e| !is_hidden(e)) {
                match entry {
                    Ok(dir_entry) => {
                        // println!("{}", &dir_entry.path().display());
                        if ! Path::new(&dir_entry.path()).is_dir() {
                            continue;
                        }
                        let session_file = format!("{}/{}",&dir_entry.path().display(), &self.ses_file);
                        if Path::new(&session_file).exists() {
                            count +=1;
                        }
                    },
                    Err(e) =>  println!("Error on {}: {}", &sess_path, e)
                }
            }
            count
        }
    }

    #[cfg(test)]
    mod tests {
        use super::*;
        use async_std::task;
        use std::time::Duration;
        const TEST_SESS_FILESTORE: &str = "/tmp/test_sess_filestore";
        const TEST_IDS_FILESTORE: &str = "/tmp/test_ids_filestore";

        #[async_std::test]
        async fn creating_a_new_session_with_no_expiry() -> Result {
            let sess_path_store = format!("{}_0", TEST_SESS_FILESTORE);
            let ids_path_store = format!("{}_0", TEST_IDS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let _ = fs::remove_dir_all(&ids_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;
            let mut session = Session::new();
            session.insert("key", "Hello")?;
            let cloned = session.clone();
            let cookie_value = store.store_session(session).await?.unwrap();
            assert!(true);
            let loaded_session = store.load_session(cookie_value).await?.unwrap();
            assert_eq!(cloned.id(), loaded_session.id());
            assert_eq!("Hello", &loaded_session.get::<String>("key").unwrap());
            assert!(!loaded_session.is_expired());
            assert!(loaded_session.validate().is_some());
            let _ = fs::remove_dir_all(&sess_path_store);
            let _ = fs::remove_dir_all(&ids_path_store);
            Ok(())
        }
        #[async_std::test]
        async fn updating_a_session() -> Result {
            let sess_path_store = format!("{}_1", TEST_SESS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;

            let mut session = Session::new();

            session.insert("key", "value")?;
            let cookie_value = store.store_session(session).await?.unwrap();

            let mut session = store.load_session(cookie_value.clone()).await?.unwrap();
            session.insert("key", "other value")?;

            assert_eq!(store.store_session(session).await?, None);
            let session = store.load_session(cookie_value).await?.unwrap();
            assert_eq!(&session.get::<String>("key").unwrap(), "other value");
            fs::remove_dir_all(&sess_path_store)?;
            Ok(())
        }

        #[async_std::test]
        async fn updating_a_session_extending_expiry() -> Result {
            let sess_path_store = format!("{}_2", TEST_SESS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;

            let mut session = Session::new();
            session.expire_in(Duration::from_secs(1));
            let original_expires = session.expiry().unwrap().clone();
            let cookie_value = store.store_session(session).await?.unwrap();

            let mut session = store.load_session(cookie_value.clone()).await?.unwrap();

            assert_eq!(session.expiry().unwrap(), &original_expires);
            session.expire_in(Duration::from_secs(3));
            let new_expires = session.expiry().unwrap().clone();
            assert_eq!(None, store.store_session(session).await?);

            let session = store.load_session(cookie_value.clone()).await?.unwrap();
            assert_eq!(session.expiry().unwrap(), &new_expires);

            task::sleep(Duration::from_secs(3)).await;
            assert_eq!(None, store.load_session(cookie_value).await?);
            fs::remove_dir_all(&sess_path_store)?;
            Ok(())
        }

        #[async_std::test]
        async fn creating_a_new_session_with_expiry() -> Result {
            let sess_path_store = format!("{}_3", TEST_SESS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;

            let mut session = Session::new();
            session.expire_in(Duration::from_secs(3));
            session.insert("key", "value")?;
            let cloned = session.clone();

            let cookie_value = store.store_session(session).await?.unwrap();

            let loaded_session = store.load_session(cookie_value.clone()).await?.unwrap();
            assert_eq!(cloned.id(), loaded_session.id());
            assert_eq!("value", &*loaded_session.get::<String>("key").unwrap());

            assert!(!loaded_session.is_expired());

            task::sleep(Duration::from_secs(3)).await;
            assert_eq!(None, store.load_session(cookie_value).await?);
            fs::remove_dir_all(&sess_path_store)?;
            Ok(())
        }

        #[async_std::test]
        async fn destroying_a_single_session() -> Result {
            let sess_path_store = format!("{}_4", TEST_SESS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;

            for _ in 0..3i8 {
                store.store_session(Session::new()).await?;
            }
            let cookie = store.store_session(Session::new()).await?.unwrap();
            assert_eq!(4, store.count().await);
            let session = store.load_session(cookie.clone()).await?.unwrap();
            store.destroy_session(session.clone()).await?;
            assert!(store.load_session(cookie).await.is_err());
            assert_eq!(3, store.count().await);

            // attempting to destroy the session again IS an ERROR, file should be deleted before
            assert!(store.destroy_session(session).await.is_err());
            fs::remove_dir_all(&sess_path_store)?;
            Ok(())
        }

        #[async_std::test]
        async fn clearing_the_whole_store() -> Result {
            let sess_path_store = format!("{}_5", TEST_SESS_FILESTORE);
            let _ = fs::remove_dir_all(&sess_path_store);
            let store = FileStore {
                sess_path: sess_path_store.to_owned(),
                ses_file: String::from("session"),
            };
            store.check_paths()?;

            for _ in 0..3i8 {
                store.store_session(Session::new()).await?;
            }
            assert_eq!(3, store.count().await);
            store.clear_store().await.unwrap();
            assert_eq!(0, store.count().await);
            fs::remove_dir_all(&sess_path_store)?;
            Ok(())
        }
    }