#[macro_use]
extern crate actix_web;
#[macro_use]
extern crate log;

use std::borrow::Borrow;
use std::collections::HashMap;
use std::ops::Deref;
use std::path::{Path, PathBuf};
use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, Ordering};

use actix_session::CookieSession;
use actix_web::{App, get, HttpRequest, HttpResponse, HttpServer, post, Responder, web};
use actix_web::http::StatusCode;
use actix_web::web::{scope, service};
use actix_web_static_files;
use actix_web_static_files::ResourceFiles as StaticFiles;
use include_dir::Dir;
use log::LevelFilter;
use once_cell::sync::Lazy;
use parking_lot::Mutex;
use rand::Rng;
use tera::Tera;

use yopa::{Storage, TypedValue};

use crate::tera_ext::TeraExt;

mod utils;
mod tera_ext;
mod routes;
mod session_ext;

// Embed static files
include!(concat!(env!("OUT_DIR"), "/static_files.rs"));

// Embed templates
static TEMPLATES: include_dir::Dir = include_dir::include_dir!("./resources/templates");

pub(crate) static TERA: Lazy<Tera> = Lazy::new(|| {
    let mut tera = Tera::default();
    tera.add_include_dir_templates(&TEMPLATES).unwrap();

    // Special filter for the TypedValue map
    use serde_json::Value;
    tera.register_filter("print_typed_value", |v: &Value, _: &HashMap<String, Value>| -> tera::Result<Value> {
        if v.is_null() {
            return Ok(v.clone());
        }
        if let Value::Object(map) = v {
            if let Some((_, v)) = map.iter().next() {
                return Ok(v.clone());
            }
        }
        Err(tera::Error::msg("Expected nonenmpty object"))
    });

    tera.register_function("opt", |args: &HashMap<String, Value>| -> tera::Result<Value> {
        if args.len() != 1 {
            return Err("Expected 1 argument".into());
        }
        match args.iter().nth(0) {
            Some((name, &Value::Bool(true))) => {
                Ok(Value::String(name.clone()))
            },
            Some((_, &Value::Bool(false))) => {
                Ok(Value::Null)
            },
            _ => Err("Expected bool argument".into()),
        }
    });

    // TODO need to inject HttpRequest::url_for() into tera context, but it then can't be accessed by the functions.
    // tera.register_function("url_for", |args: HashMap<String, Value>| -> tera::Result<Value> {
    //     match args.get("name") {
    //         Some(Value::String(s)) => {
    //             let r =
    //         },
    //         _ => Err("Expected string argument".into()),
    //     }
    // });

    tera
});

type YopaStoreWrapper = web::Data<tokio::sync::RwLock<yopa::Storage>>;

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    simple_logging::log_to_stderr(LevelFilter::Debug);

    // Ensure the lazy ref is initialized early (to catch template bugs ASAP)
    let _ = TERA.deref();

    let yopa_store: YopaStoreWrapper = init_yopa();

    let mut session_key = [0u8; 32];
    rand::thread_rng().fill(&mut session_key);

    debug!("Session key: {:?}", session_key);

    HttpServer::new(move || {
        let static_files = StaticFiles::new("/static", included_static_files())
            .do_not_resolve_defaults();

        App::new()
            /* Middlewares */
            .wrap(
                CookieSession::signed(&session_key)
                    .secure(false)
            )

            /* Bind shared objects */
            .app_data(yopa_store.clone())

            /* Routes */
            .service(routes::index)
            //
            .service(routes::object_model::create_form)
            .service(routes::object_model::create)
            .service(routes::object_model::update_form)
            .service(routes::object_model::update)
            .service(routes::object_model::delete)
            //
            .service(routes::relation_model::create_form)
            .service(routes::relation_model::create)
            .service(routes::relation_model::update_form)
            .service(routes::relation_model::update)
            .service(routes::relation_model::delete)
            //
            .service(routes::property_model::create_form)
            .service(routes::property_model::create)
            .service(routes::property_model::delete)
            .service(static_files)
            .default_service(web::to(|| HttpResponse::NotFound().body("File or endpoint not found")))
    })
        .bind("127.0.0.1:8080")?
        .run().await
}


fn init_yopa() -> YopaStoreWrapper {
    let mut store = Storage::new();

    // Seed the store with some dummy data for view development
    use yopa::model;
    use yopa::DataType;

    let id_recipe = store.define_object(model::ObjectModel {
        id: Default::default(),
        name: "Recipe".to_string(),
    }).unwrap();

    let id_book = store.define_object(model::ObjectModel {
        id: Default::default(),
        name: "Book".to_string(),
    }).unwrap();

    let id_ing = store.define_object(model::ObjectModel {
        id: Default::default(),
        name: "Ingredient".to_string(),
    }).unwrap();

    store.define_property(model::PropertyModel {
        id: Default::default(),
        object: id_recipe,
        name: "name".to_string(),
        optional: false,
        multiple: true,
        data_type: DataType::String,
        default: None,
    }).unwrap();

    store.define_property(model::PropertyModel {
        id: Default::default(),
        object: id_book,
        name: "title".to_string(),
        optional: false,
        multiple: false,
        data_type: DataType::String,
        default: None,
    }).unwrap();

    store.define_property(model::PropertyModel {
        id: Default::default(),
        object: id_book,
        name: "author".to_string(),
        optional: true,
        multiple: true,
        data_type: DataType::String,
        default: Some(TypedValue::String("Pepa Novák".into())),
    }).unwrap();

    let rel_book_id = store.define_relation(model::RelationModel {
        id: Default::default(),
        object: id_recipe,
        name: "book reference".to_string(),
        reciprocal_name: "recipes".to_string(),
        optional: true,
        multiple: true,
        related: id_book,
    }).unwrap();

    store.define_property(model::PropertyModel {
        id: Default::default(),
        object: rel_book_id,
        name: "page".to_string(),
        optional: true,
        multiple: false,
        data_type: DataType::Integer,
        default: None,
    }).unwrap();

    store.define_relation(model::RelationModel {
        id: Default::default(),
        object: id_recipe,
        name: "related recipe".to_string(),
        reciprocal_name: "related recipe".to_string(),
        optional: true,
        multiple: true,
        related: id_recipe,
    }).unwrap();

    web::Data::new(tokio::sync::RwLock::new(store))
}