#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use]
extern crate rocket;

#[macro_use]
extern crate lazy_static;
use std::path::{PathBuf, Path};
use std::env;
use std::fs;
use std::ffi::OsStr;
use std::collections::HashMap;
use rocket::response::{NamedFile, Redirect};
use rocket::http::{Cookie, Cookies, ContentType, Status};
use rocket::request::{self, Request, Form, FromRequest};
use rocket_contrib::templates::Template;
use rocket_upload::MultipartDatas;
use serde::{Serialize, Deserialize};

lazy_static! {
    static ref DIR: PathBuf = Path::new(env::var("FASTCLOUD_DIR").unwrap_or_else(|_| String::from("")).as_str()).to_path_buf();
    static ref ADMIN_KEY: String = env::var("FASTCLOUD_ADMIN_KEY").unwrap_or_else(|_| String::from(""));
    static ref USER_KEY: String = env::var("FASTCLOUD_USER_KEY").unwrap_or_else(|_| String::from(""));
    static ref PUBLIC_READ: bool = env::var("FASTCLOUD_PUBLIC").unwrap_or_else(|_| String::from("")) != *"";
}

#[derive(Serialize)]
struct DirPath {
    is_file: bool,
    path: String,
    name: String,
}

#[derive(FromForm)]
struct DirName {
    name: String
}

#[derive(Debug, FromForm, Deserialize)]
struct GenericUser {
    key: String,
}

struct AdminUser;

impl<'a, 'r> FromRequest<'a, 'r> for GenericUser {
    type Error = ();

    fn from_request(request: &'a Request<'r>) -> request::Outcome<Self, Self::Error> {
        match request.cookies().get("key") {
            Some(key) => {
                if key.value() == ADMIN_KEY.as_str() || key.value() == USER_KEY.as_str() {
                    request::Outcome::Success(GenericUser { key: String::from(key.value()) })
                } else if *PUBLIC_READ {
                        request::Outcome::Success(GenericUser { key: String::from("") })
                } else {
                    request::Outcome::Failure((Status::BadRequest, ()))
                } 
            },
            None => {
                if *PUBLIC_READ {
                    request::Outcome::Success(GenericUser { key: String::from("") })
                } else {
                    request::Outcome::Failure((Status::BadRequest, ()))
                }
            }
        }
    }
}

impl<'a, 'r> FromRequest<'a, 'r> for AdminUser {
    type Error = ();

    fn from_request(request: &'a Request<'r>) -> request::Outcome<Self, Self::Error> {
        match request.cookies().get("key") {
            Some(key) => {
                if key.value() == ADMIN_KEY.as_str() {
                    request::Outcome::Success(AdminUser)
                } else {
                    request::Outcome::Forward(())
                }
            },
            None =>  request::Outcome::Forward(())
        }
    }
}

#[get("/")]
fn root() -> Template {
    let map: HashMap<String, String> = HashMap::new();
    Template::render("home", map)
}

#[post("/login", data = "<form>")]
fn login(form: Form<GenericUser>, mut cookies: Cookies) -> Redirect {
    let key = form.into_inner().key;
    let mut cook = Cookie::new("key", key);
    cook.set_http_only(true);
    cook.set_secure(true);
    cookies.add(cook);
    Redirect::to("/serve")
}

#[get("/logout")]
fn logout(mut cookies: Cookies) -> Redirect {
    match cookies.get("key") {
        Some(_) => {
            cookies.remove(Cookie::named("key"));
            Redirect::to("/")
        }
        None => {
            Redirect::to("/")
        }
    }
}

#[get("/serve")]
fn get_root(_guard: AdminUser) -> Template {
    let path = DIR.as_path().to_str().unwrap_or("");
    Template::render("dir", directory_structure(path.to_string()))
}

#[get("/serve", rank = 2)]
fn get_root_generic(_guard: GenericUser) -> Template {
    let path = DIR.as_path().to_str().unwrap_or("");
    Template::render("generic", directory_structure(path.to_string()))
}

#[get("/serve/<path..>")]
fn get_dir_entry(path: PathBuf, _guard: AdminUser) -> Template {
    let dir = DIR.as_path().join(path);
    let path = dir.to_str().unwrap_or("");
    Template::render("dir", directory_structure(path.to_string()))
}

#[get("/serve/<path..>", rank = 2)]
fn get_dir_entry_generic(path: PathBuf, _guard: GenericUser) -> Template {
    let dir = DIR.as_path().join(path);
    let path = dir.to_str().unwrap_or("");
    Template::render("generic", directory_structure(path.to_string()))
}

#[post("/dir/<path..>", data = "<form>")]
fn create_dir(path: PathBuf, form: Form<DirName>, _guard: AdminUser) -> Redirect {
    let dir = DIR.as_path().join(path.clone()).join(form.into_inner().name);
    fs::create_dir_all(dir).unwrap();
    Redirect::to(uri!(get_dir_entry: path))
}

#[post("/dir", data = "<form>")]
fn create_dir_root(form: Form<DirName>, _guard: AdminUser) -> Redirect {
    let dir = DIR.as_path().join(form.into_inner().name);
    fs::create_dir_all(dir).unwrap();
    Redirect::to(uri!(get_root))
}

#[get("/del/<path..>")]
fn delete(path: PathBuf, _guard: AdminUser) -> Redirect {
    let dir = DIR.as_path().join(path.clone());
    if dir.is_file() {
        fs::remove_file(dir).unwrap();
    } else {
        fs::remove_dir_all(dir).unwrap();
    }
    let npath = path.parent().unwrap().to_path_buf();
    Redirect::to(uri!(get_dir_entry: npath))
}

fn directory_structure(path: String) -> HashMap<&'static str, HashMap<i32, DirPath>> {
    let dir = Path::new(path.as_str());
    let paths = fs::read_dir(dir).unwrap()
        .map(|x| x.unwrap().path().into_os_string().into_string().unwrap())
        .enumerate()
        .map(|x| (x.0 as i32, DirPath { 
            is_file: Path::new(&x.1).is_file(), 
            path: Path::new(&x.1).strip_prefix(DIR.clone().into_os_string().into_string().unwrap()).unwrap().to_str().unwrap().to_string(),
            name: Path::new(&x.1).file_name().unwrap().to_str().unwrap().to_string(),
        }))
        .collect::<HashMap<i32, DirPath>>();
    let mut context: HashMap<&str, HashMap<i32, DirPath>> = HashMap::new();
    let parent = DirPath {
        is_file: false,
        path: dir.strip_prefix(DIR.clone().into_os_string().into_string().unwrap()).unwrap().parent().unwrap_or_else(|| Path::new("")).to_str().unwrap().to_string(),
        name: dir.parent().unwrap().file_name().unwrap_or_else(|| OsStr::new("")).to_str().unwrap().to_string(),
    };

    let current = DirPath {
        is_file: false,
        path: dir.strip_prefix(DIR.clone().into_os_string().into_string().unwrap()).unwrap_or_else(|_| Path::new("")).to_str().unwrap().to_string(),
        name: dir.file_name().unwrap_or_else(|| OsStr::new("")).to_str().unwrap().to_string(),
    };
    let mut pt = HashMap::new();
    pt.insert(0, parent);
    context.insert("parent", pt);
    let mut pt = HashMap::new();
    pt.insert(0, current);
    context.insert("current", pt);
    context.insert("ctx", paths);
    context
}


#[get("/file/<path..>")]
fn file_get(path: PathBuf, _guard: GenericUser) -> Option<NamedFile> {
    let dir = DIR.as_path().join(path);
    rocket::response::NamedFile::open(dir.as_path()).ok()
}

#[post("/upload/<path..>", data = "<data>")]
fn upload_file(path: PathBuf, _content_type: &ContentType, data:MultipartDatas, _guard: AdminUser) -> Redirect {
    let dir = DIR.as_path().join(path.clone());
    for f in data.files {
        if !Path::new(&format!("{}/{}", dir.to_str().unwrap(), f.filename)).exists() {
            f.persist(&dir);
        }
        for i in 0.. {
            if !Path::new(&format!("{}/{}.{}", dir.to_str().unwrap(), f.filename, i)).exists() {
                f.persist(&dir);
                break
            }
        }
    }
    Redirect::to(uri!(get_dir_entry: path))
}

#[post("/upload", data = "<data>")]
fn upload_root(_content_type: &ContentType, data:MultipartDatas, _guard: AdminUser) -> Redirect {
    let dir = DIR.as_path();
    for f in data.files {
        if !Path::new(&format!("{}/{}", dir.to_str().unwrap(), f.filename)).exists() {
            f.persist(dir);
        }
        for i in 0.. {
            if !Path::new(&format!("{}/{}.{}", dir.to_str().unwrap(), f.filename, i)).exists() {
                f.persist(dir);
                break
            }
        }
    }
    Redirect::to(uri!(get_root))
}



// TODO: move files
// TODO: rename files
// TODO: rewrite frontend

fn main() {
    rocket::ignite()
        .attach(Template::fairing())
        .mount("/", routes![
               root, login, logout,
               get_root, get_root_generic, get_dir_entry, get_dir_entry_generic, 
               create_dir, create_dir_root, file_get, 
               upload_root, upload_file, delete]).launch();
}