extern crate actix;
extern crate actix_web;
extern crate git2;
extern crate http;
extern crate serde_json;

extern crate env_logger;


// This example serves the docs from target/doc/staticfile at /doc/
//
// Run `cargo doc && cargo run --example doc_server`, then
// point your browser to http://127.0.0.1:3000/doc/

use std::path::{Path, PathBuf};
use std::error::Error;
use std::env;
use std::sync::{Arc, Mutex};

use actix::ActorContext;
use actix_web::{
    fs, ws, middleware, server, App, HttpMessage, HttpRequest, HttpResponse
};

use git2::Repository;

struct WebHookConfig {
    secret: String,
    repo_root: PathBuf,
    repo_prefixes: Vec<String>,
}

fn redeploy_repo(url: &str, path: &Path, name: &str) -> Result<(), git2::Error> {
    let mut new_path = path.to_path_buf();
    new_path.push(name);
    eprintln!("Cloning {} into {:?} ({:?} / {})", url, new_path, path, name);

    let repo = match Repository::open(&new_path) {
        Ok(repo) => repo,
        Err(e) => {
            eprintln!("can't open repo, going to try cloning it: {}", e.description());
            match Repository::clone(url, &new_path) {
                Ok(repo) => repo,
                Err(e) => panic!("failed to clone: {}", e),
            }
        }
    };
    
    repo.find_remote("origin")?.fetch(&["master"], None, None)?;
    repo.set_head("FETCH_HEAD")?;
    repo.checkout_head(Some(git2::build::CheckoutBuilder::new().force().use_theirs(true)))?;

    Ok(())
}

fn webhook_handler((contents, req): (String, HttpRequest<Arc<Mutex<WebHookConfig>>>)) -> HttpResponse {
    let config = req.state().lock().unwrap();

    // Ensure there's a "Push" event
    if let Some(v) = req.headers().get("X-GitHub-Event") {
        match v.to_str() {
            Err(_) => return HttpResponse::BadRequest().body("invalid X-Github-Event header"),
            Ok(o) => {
                if o != "push" {
                    return HttpResponse::Ok().body("Ok");
                }
            }
        }
    } else {
        return HttpResponse::Ok().body("Ok");
    }

    // Parse the JSON
    let wh: serde_json::Value = match serde_json::from_str(&contents) {
        Ok(o) => o,
        Err(e) => return HttpResponse::BadRequest().body(format!("invalid json data: {}", e.description())),
    };

    // Ensure we have a "Secret" parameter, and that it matches the config.
    let found_secret = wh.get("secret");
    if found_secret.is_none() {
        return HttpResponse::Unauthorized().body("invalid secret");
    }
    let found_secret = found_secret.unwrap();
    if found_secret != &config.secret {
        return HttpResponse::Unauthorized().body("invalid secret");
    }

    // Ensure the repo is valid.
    let repository = wh.get("repository");
    if repository.is_none() {
        eprintln!("No 'repository' key found");
        return HttpResponse::PreconditionFailed().body("no 'repository' key found");
    }
    let repository = repository.unwrap();
    // Ensure there's an HTML URL that's a valid string
    let html_url = match repository.get("html_url") {
        None => {
            eprintln!("No HTML URL found");
            return HttpResponse::PreconditionFailed().body("no repository html_url found");
        }
        Some(s) => match s.as_str() {
            None => {
                eprintln!("HTML URL isn't a string");
                return HttpResponse::PreconditionFailed().body("html_url is not a string");
            }
            Some(s) => s,
        },
    };

    // Check to make sure the repo prefix is one we recognize
    let mut found_match = false;
    for prefix in &config.repo_prefixes {
        if html_url.starts_with(prefix) {
            found_match = true;
            break;
        }
    }
    if !found_match {
        eprintln!("URL doesn't start with match");
        return HttpResponse::PreconditionFailed().body("url doesn't start with a recognized prefix");
    }

    // And ensure the URL is a string
    let website_url: http::uri::Uri = match repository.get("website") {
        None => {
            eprintln!("The website isn't configured for this repo");
            return HttpResponse::PreconditionFailed().body("this repo has no website configured");
        }
        Some(s) => match s.as_str() {
            None => {
                eprintln!("Website URL isn't a string");
                return HttpResponse::PreconditionFailed().body("repo's website url is not a string");
            }
            Some(s) => match s.parse() {
                Ok(u) => u,
                Err(e) => {
                    eprintln!("Unable to parse URL: {:?}", e);
                    return HttpResponse::PreconditionFailed().body("repo's url is unparseable");
                }
            },
        },
    };
    let target_path = match website_url.path().split("/").last() {
        Some(s) => {
            if s.is_empty() || s == "." || s == ".." {
                eprintln!("No website URL path was found -- defaulting to \"current\"");
                "current".to_owned()
            } else {
                s.to_string()
            }
        }
        None => {
            eprintln!("No website URL path was found");
            return HttpResponse::PreconditionFailed().body("no website url path could be found");
        }
    };
    eprintln!("Final path: {:?} / {:?}", config.repo_root, target_path);

    if let Err(e) = redeploy_repo(html_url, &config.repo_root, &target_path) {
        eprintln!("unable to clone/update repo: {}", e.description());
        return HttpResponse::NotModified().body("unable to clone/update repo");
    }

    HttpResponse::Ok().body("Ok") // <- send response
}


/// websocket connection is long running connection, it easier
/// to handle with an actor
struct MyWebSocket {
    // Client must send ping at least once per 10 seconds (CLIENT_TIMEOUT),
    // otherwise we drop connection.
    //hb: Instant,
}

impl actix::prelude::Actor for MyWebSocket {
    type Context = ws::WebsocketContext<Self, Arc<Mutex<WebHookConfig>>>;

    /// Method is called on actor start. We start the heartbeat process here.
    fn started(&mut self, ctx: &mut Self::Context) {
        //self.hb(ctx);
    }
}

/// Handler for `ws::Message`
impl actix::prelude::StreamHandler<ws::Message, ws::ProtocolError> for MyWebSocket {
    fn handle(&mut self, msg: ws::Message, ctx: &mut Self::Context) {
        // process websocket messages
        println!("WS: {:?}", msg);
        match msg {
            ws::Message::Ping(msg) => {
//                self.hb = Instant::now();
                ctx.pong(&msg);
            }
            ws::Message::Pong(_) => {
//                self.hb = Instant::now();
            }
            ws::Message::Text(text) => ctx.text(text),
            ws::Message::Binary(bin) => ctx.binary(bin),
            ws::Message::Close(_) => {
                ctx.stop();
            }
        }
    }
}

impl MyWebSocket {
    fn new() -> Self {
        Self { /*hb: Instant::now()*/ }
    }

/*
    /// helper method that sends ping to client every second.
    ///
    /// also this method checks heartbeats from client
    fn hb(&self, ctx: &mut <Self as actix::prelude::Actor>::Context) {
        ctx.run_interval(HEARTBEAT_INTERVAL, |act, ctx| {
            // check client heartbeats
            if Instant::now().duration_since(act.hb) > CLIENT_TIMEOUT {
                // heartbeat timed out
                println!("Websocket Client heartbeat failed, disconnecting!");

                // stop actor
                ctx.stop();

                // don't try to send a ping
                return;
            }

            ctx.ping("");
        });
    }
    */
}

/// do websocket handshake and start `MyWebSocket` actor
fn ws_index(r: &HttpRequest<Arc<Mutex<WebHookConfig>>>) -> Result<HttpResponse, actix_web::Error> {
    //ws::start(r, MyWebSocket::new())
    Ok(HttpResponse::Ok().body("go ahead"))
}

fn main() {
    env::set_var("RUST_LOG", "actix_web=debug");
    env::set_var("RUST_BACKTRACE", "1");
    env_logger::init();

    let hostaddr = "0.0.0.0:9119".to_owned();
    let config = WebHookConfig {
        secret: "1234".to_owned(),
        repo_root: Path::new("D:\\Code\\talkserved").to_path_buf(),
        repo_prefixes: vec!["https://git.xobs.io/xobs".to_owned()],
    };

    println!("Doc server running on http://{}", hostaddr);

    let repo_root_copy = Arc::new(Mutex::new(config.repo_root.clone()));
    let config = Arc::new(Mutex::new(config));
    let sys = actix::System::new("basic-example");

    server::new(move || {
        App::with_state(config.clone())
            // enable logger
            .middleware(middleware::Logger::default())
            
            // websocket route
            .resource("/socket.io/", |r| r.method(actix_web::http::Method::GET).f(ws_index))

            // Our webhook
            .resource("/webhook", |r| 
                r.method(actix_web::http::Method::POST)
                    .with_config(webhook_handler, |((cfg, _),)| {
                        cfg.limit(16384);
                    })
            )

            // static files
            .handler("/", fs::StaticFiles::new(&*repo_root_copy.lock().unwrap().clone()).unwrap().index_file("index.html"))
            
    })
    .bind(hostaddr.clone()).expect(&format!("Can not bind to {}", hostaddr))
    .shutdown_timeout(0)    // <- Set shutdown timeout to 0 seconds (default 60s)
    .start();
    let _ = sys.run();
}