#[macro_use]
extern crate diesel;
extern crate rayon;

use actix_files::NamedFile;
use actix_web::web::{HttpRequest, HttpResponse, Json};
use actix_web::{get, post, web, App, HttpServer, Responder};
use chrono::{Duration, Utc};
use data::{LoginRequest, ThumbnailRequest};
use jsonwebtoken::{encode, EncodingKey, Header};
use rayon::prelude::*;
use serde::Serialize;
use std::path::{Path, PathBuf};

use crate::data::{Claims, CreateAccountRequest, Token};
use crate::database::{create_user, get_user, user_exists};
use crate::files::list_files;
use crate::video::create_playlist;

mod data;
mod database;
mod files;
mod video;

#[post("/register")]
async fn register(user: Json<CreateAccountRequest>) -> impl Responder {
    if !user.username.is_empty() && user.password.len() > 5 && user.password == user.confirmation {
        if user_exists(&user.username) {
            HttpResponse::BadRequest()
        } else if let Some(_user) = create_user(&user.username, &user.password) {
            HttpResponse::Ok()
        } else {
            HttpResponse::InternalServerError()
        }
    } else {
        HttpResponse::BadRequest()
    }
}

#[post("/login")]
async fn login(creds: Json<LoginRequest>) -> impl Responder {
    println!("Logging in: {}", creds.username);
    if let Some(user) = get_user(&creds.username, &creds.password) {
        let claims = Claims {
            sub: user.id.to_string(),
            exp: (Utc::now() + Duration::days(3)).timestamp(),
        };
        let token = encode(
            &Header::default(),
            &claims,
            &EncodingKey::from_secret("secret_token".as_ref()),
        )
        .unwrap();
        HttpResponse::Ok().json(Token { token: &token })
    } else {
        HttpResponse::NotFound().finish()
    }
}

#[post("/photos")]
async fn list_photos(_claims: Claims, req: Json<ThumbnailRequest>) -> impl Responder {
    println!("{}", req.path);

    let path = &req.path;
    if let Some(path) = is_valid_path(path) {
        let files = list_files(path).unwrap_or_default();

        let photos = &files
            .iter()
            .filter(|f| !f.extension().unwrap_or_default().is_empty())
            .map(|f| f.to_str().unwrap().to_string())
            .collect::<Vec<String>>();

        let dirs = &files
            .iter()
            .filter(|f| f.extension().unwrap_or_default().is_empty())
            .map(|f| f.to_str().unwrap().to_string())
            .collect::<Vec<String>>();

        HttpResponse::Ok().json(PhotosResponse { photos, dirs })
    } else {
        HttpResponse::BadRequest().finish()
    }
}

#[derive(Serialize)]
struct PhotosResponse<'a> {
    photos: &'a [String],
    dirs: &'a [String],
}

fn is_valid_path(path: &str) -> Option<PathBuf> {
    match path {
        path if path.contains("..") => None,

        path => {
            let path = PathBuf::from(path);
            if path.is_relative() {
                let mut full_path = PathBuf::from(dotenv::var("BASE_PATH").unwrap());
                full_path.push(path);
                Some(full_path)
            } else {
                None
            }
        }
    }
}

#[get("/image")]
async fn get_image(
    _claims: Claims,
    request: HttpRequest,
    req: web::Query<ThumbnailRequest>,
) -> impl Responder {
    if let Some(path) = is_valid_path(&req.path) {
        if req.size.is_some() {
            let thumbs = dotenv::var("THUMBNAILS").unwrap();
            let thumb_path = Path::new(&thumbs).join(path.file_name().unwrap());

            println!("{:?}", thumb_path);
            if let Ok(file) = NamedFile::open(&thumb_path) {
                file.into_response(&request).unwrap()
            } else {
                HttpResponse::NotFound().finish()
            }
        } else if let Ok(file) = NamedFile::open(path) {
                file.into_response(&request).unwrap()
        } else {
            HttpResponse::NotFound().finish()
        }
    } else {
        HttpResponse::BadRequest().finish()
    }
}

#[post("/video/generate")]
async fn generate_video(_claims: Claims, body: web::Json<ThumbnailRequest>) -> impl Responder {
    let filename = PathBuf::from(&body.path);

    if let Some(name) = filename.file_stem() {
        let filename = name.to_str().expect("Filename should convert to string");
        let playlist = format!("tmp/{}.m3u8", filename);
        if let Some(path) = is_valid_path(&body.path) {
            create_playlist(&path.to_str().unwrap(), &playlist);
        } else {
            return HttpResponse::BadRequest().finish();
        }

        HttpResponse::Ok().json(playlist)
    } else {
        HttpResponse::BadRequest().finish()
    }
}

#[get("/video/stream")]
async fn stream_video(request: HttpRequest, path: web::Query<ThumbnailRequest>) -> impl Responder {
    let playlist = &path.path;
    println!("Playlist: {}", playlist);

    if let Ok(file) = NamedFile::open(playlist) {
        file.into_response(&request).unwrap()
    } else {
        HttpResponse::NotFound().finish()
    }
}

#[get("/video/{path}")]
async fn get_video_part(request: HttpRequest, path: web::Path<ThumbnailRequest>) -> impl Responder {
    let part = &path.path;
    println!("Video part: {}", part);

    if let Ok(file) = NamedFile::open(String::from("tmp/") + part) {
        file.into_response(&request).unwrap()
    } else {
        HttpResponse::NotFound().finish()
    }
}

async fn create_thumbnails() {
    let thumbs = &dotenv::var("THUMBNAILS").expect("THUMBNAILS not defined");
    let thumbnail_directory: &Path = Path::new(thumbs);

    let t: Vec<_> = thumbnail_directory
        .read_dir()
        .expect("Error reading thumbnail directory")
        .collect();
    if !t.is_empty() {
        println!("Skipping thumbs");
        return;
    }

    let images = PathBuf::from(dotenv::var("BASE_PATH").unwrap());

    walkdir::WalkDir::new(images)
        .into_iter()
        .collect::<Vec<Result<_, _>>>()
        .into_par_iter()
        .filter_map(|entry| entry.ok())
        .filter(|entry| {
            println!("{:?}", entry.path());
            if let Some(ext) = entry.path().extension().and_then(|ext| {
                ext.to_str().map(|ext| ext.to_lowercase())
            }) {
                ext == "jpg" || ext == "jpeg" || ext == "png"
            } else {
                false
            }
        })
        .map(|entry| (image::open(entry.path()), entry.path().to_path_buf()))
        .filter(|(img, _)| img.is_ok())
        .map(|(img, path)| (img.unwrap(), path))
        .map(|(image, path)| (image.thumbnail(200, 200), path))
        .map(|(image, path)| {
            let thumb = Path::new(thumbnail_directory).join(path.file_name().unwrap());
            println!("{:?}", thumb);
            image.save(thumb).expect("Failure saving thumbnail");
        })
        .for_each(drop);

    println!("Finished");
}

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    create_thumbnails().await;

    HttpServer::new(|| {
        App::new()
            .service(register)
            .service(login)
            .service(list_photos)
            .service(get_image)
            .service(generate_video)
            .service(stream_video)
            .service(get_video_part)
    })
    .bind("192.168.10.23:8088")?
    .bind("localhost:8088")?
    .run()
    .await
}