use std::{
    ops::Deref,
    path::{Path, PathBuf},
};
use thiserror::Error;
use uuid::Uuid;

mod file;
mod fileinfo;
mod thumbnail;
pub mod utils;

pub use file::File;
pub use fileinfo::FileInfo;
pub use thumbnail::Thumbnail;

#[derive(Debug, Error)]
pub enum WriteFileError {
    #[error("root file path does not exist")]
    RootNotFound,

    #[error("permission denied")]
    PermissionDenied,

    #[error("JSON error")]
    JSONError(#[from] serde_json::error::Error),

    #[error("IO error")]
    IOError(#[from] std::io::Error),
}

#[derive(Debug, Error)]
pub enum ReadFileError {
    #[error("file not found")]
    FileNotFound,

    #[error("path is not a file")]
    NotAFile,

    #[error("permission denied")]
    PermissionDenied,

    #[error("JSON error")]
    JSONError(#[from] serde_json::error::Error),

    #[error("IO error")]
    IOError(#[from] std::io::Error),
}

#[derive(Clone, Debug)]
pub struct PathResolver(pub PathBuf);

impl PathResolver {
    fn file_path(&self) -> PathBuf {
        self.0.clone()
    }

    fn metadata_path(&self) -> PathBuf {
        let mut path = self.0.clone();
        path.set_extension("json");
        path
    }

    fn thumbnail_path(&self) -> PathBuf {
        let mut path = self.0.clone();
        path.set_extension("tn");
        path
    }
}

impl From<String> for PathResolver {
    fn from(s: String) -> Self {
        Self(PathBuf::from(s))
    }
}

impl From<&str> for PathResolver {
    fn from(s: &str) -> Self {
        Self(PathBuf::from(s.to_owned()))
    }
}

#[derive(Clone, Debug)]
pub struct FileId(String);

impl From<String> for FileId {
    fn from(s: String) -> Self {
        Self(s)
    }
}

impl From<&str> for FileId {
    fn from(s: &str) -> Self {
        Self(s.to_owned())
    }
}

impl Deref for FileId {
    type Target = String;
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

pub trait FileRoot {
    fn root(&self) -> PathBuf;
}

pub struct Context(PathBuf);

impl FileRoot for Context {
    fn root(&self) -> PathBuf {
        self.0.clone()
    }
}

pub struct Store {
    files_root: PathBuf,
}

impl Store {
    pub fn new(files_root: PathBuf) -> Self {
        Self { files_root }
    }

    pub fn list_files(&self) -> Vec<Result<File, ReadFileError>> {
        unimplemented!()
    }

    pub fn add_file(&mut self, filename: String, content: Vec<u8>) -> Result<File, WriteFileError> {
        let context = Context(self.files_root.clone());
        let mut file = File::new(filename, context)?;
        file.set_content(content)?;
        Ok(file)
    }

    pub fn delete_file(&mut self, id: String) -> Result<(), WriteFileError> {
        /*
        let f = File::open(&id, &self.files_root)?;
        f.delete()
        */
        unimplemented!()
    }

    pub fn get_metadata(&self, id: String) -> Result<FileInfo, ReadFileError> {
        // FileInfo::open(&id, &self.files_root)
        unimplemented!()
    }

    pub fn get_file(&self, id: &str) -> Result<(FileInfo, std::fs::File), ReadFileError> {
        /*
        let f = File::open(&id, &self.files_root)?;
        let info = f.info();
        let stream = f.stream()?;
        Ok((info, stream))
        */
        unimplemented!()
    }

    pub fn get_thumbnail(&self, id: &str) -> Result<(FileInfo, std::fs::File), ReadFileError> {
        /*
        let f = File::open(id, &self.files_root)?;
        let stream = f.thumbnail().stream()?;
        Ok((f.info(), stream))
        */
        unimplemented!()
    }
}

#[cfg(test)]
mod test {
    use crate::store::utils::FileCleanup;

    use super::*;
    use std::io::Read;

    #[test]
    fn paths() {
        let resolver = PathResolver::from("path/82420255-d3c8-4d90-a582-f94be588c70c");
        assert_eq!(
            resolver.file_path(),
            PathBuf::from("path/82420255-d3c8-4d90-a582-f94be588c70c")
        );
        assert_eq!(
            resolver.metadata_path(),
            PathBuf::from("path/82420255-d3c8-4d90-a582-f94be588c70c.json")
        );
        assert_eq!(
            resolver.thumbnail_path(),
            PathBuf::from("path/82420255-d3c8-4d90-a582-f94be588c70c.tn")
        );
    }

    #[test]
    fn adds_files() {
        let mut buf = Vec::new();
        let mut file = std::fs::File::open("fixtures/rawr.png").unwrap();
        file.read_to_end(&mut buf).unwrap();

        let mut store = Store::new(PathBuf::from("var/"));
        let file_record = store.add_file("rawr.png".to_owned(), buf).unwrap();

        let _file = FileCleanup(PathBuf::from(format!("var/{}", *file_record.id)));
        let _md = FileCleanup(PathBuf::from(format!("var/{}.json", *file_record.id)));
        let _tn = FileCleanup(PathBuf::from(format!("var/{}.tn", *file_record.id)));

        assert!(PathBuf::from(format!("var/{}", *file_record.id)).exists());
        assert!(PathBuf::from(format!("var/{}.json", *file_record.id)).exists());
        assert!(PathBuf::from(format!("var/{}.tn", *file_record.id)).exists());
    }

    #[test]
    fn sets_up_metadata_for_file() {}

    #[test]
    fn sets_up_thumbnail_for_file() {}

    #[test]
    fn deletes_associated_files() {}

    #[test]
    fn lists_files_in_the_db() {}
}