#[cfg(not(target_env = "msvc"))]
use tikv_jemallocator::Jemalloc;

#[cfg(not(target_env = "msvc"))]
#[global_allocator]
static GLOBAL: Jemalloc = Jemalloc;

use anyhow::Result;
use clap::{Parser, Subcommand};
use diesel::prelude::*;
use uuidv7::Uuid;

use gitea_pages::{api, db, init, init_nginx, worker, CONFIG};

#[derive(Debug, Parser)]
#[clap(author, version, about, long_about = None)]
struct Cli {
    #[clap(subcommand)]
    commands: Commands,
}

#[derive(Debug, Subcommand)]
enum Commands {
    #[clap(about = "Starts Celery worker")]
    Worker,

    #[clap(about = "Starts beat for Celery worker")]
    Beat,

    #[clap(about = "Starts API")]
    Api,
}

#[tokio::main]
async fn main() -> Result<()> {
    let args = Cli::parse();

    env_logger::init();

    init()?;

    match args.commands {
        Commands::Worker => {
            init_nginx()?;

            let worker_conn = &worker::POOL.get().await.get().await?;
            worker_conn.display_pretty().await;
            worker_conn.consume_from(&[worker::QUEUE_NAME]).await?;
        }
        Commands::Beat => {
            worker::beat().await?.start().await?;
        }
        Commands::Api => {
            use actix_cors::Cors;
            use actix_web::{
                http::header, middleware, web, App, HttpRequest, HttpResponse, HttpServer,
            };
            use anyhow::Result;
            use juniper_actix::graphql_handler;
            use serde::Deserialize;
            use std::str::FromStr;

            async fn not_found() -> &'static str {
                "Not found!"
            }

            #[derive(Deserialize, Debug)]
            struct Owner {
                username: String,
            }

            #[derive(Deserialize, Debug)]
            struct Repository {
                owner: Owner,
                name: String,
            }

            #[derive(Deserialize, Debug)]
            struct Payload {
                repository: Repository,
            }

            async fn webhook(req: HttpRequest, body: web::Bytes) -> HttpResponse {
                if let Some(content_type) = req.headers().get(header::CONTENT_TYPE) {
                    if content_type.as_bytes() != b"application/json" {
                        return HttpResponse::BadRequest()
                            .body("Content-Type not application/json");
                    }
                }

                let key =
                    ring::hmac::Key::new(ring::hmac::HMAC_SHA256, CONFIG.gitea_secret.as_bytes());

                let signature = match req.headers().get("X-Gitea-Signature") {
                    Some(x) => x,
                    None => return HttpResponse::BadRequest().body("X-Gitea-Signature not given"),
                };
                let mut tag = vec![0u8; signature.len() / 2];
                if hex_simd::decode(signature.as_bytes(), hex_simd::Out::from_slice(&mut tag))
                    .is_err()
                {
                    return HttpResponse::BadRequest().body("Could not decode signature");
                }

                if ring::hmac::verify(&key, body.as_ref(), &tag).is_err() {
                    return HttpResponse::BadRequest().body("Invalid signature");
                }

                let payload = match serde_json::from_slice::<Payload>(body.as_ref()) {
                    Ok(x) => x,
                    Err(_) => return HttpResponse::BadRequest().body("Payload has invalid JSON"),
                };

                let db_conn = &mut match db::POOL.get() {
                    Ok(x) => x,
                    Err(_) => return HttpResponse::InternalServerError().finish(),
                };
                let user_id = match db::schema::users::table
                    .select(db::schema::users::id)
                    .filter(db::schema::users::name.eq(payload.repository.owner.username))
                    .first::<Uuid>(db_conn)
                    .optional()
                {
                    Ok(x) => match x {
                        Some(y) => y,
                        None => {
                            return HttpResponse::BadRequest().body("Repository is not allowed")
                        }
                    },
                    Err(_) => return HttpResponse::InternalServerError().finish(),
                };
                let repo_id = match db::schema::repositories::table
                    .select(db::schema::repositories::id)
                    .filter(db::schema::repositories::user_id.eq(user_id))
                    .filter(db::schema::repositories::name.eq(payload.repository.name))
                    .first::<Uuid>(db_conn)
                    .optional()
                {
                    Ok(x) => match x {
                        Some(y) => y,
                        None => {
                            return HttpResponse::BadRequest().body("Repository is not allowed")
                        }
                    },
                    Err(_) => return HttpResponse::InternalServerError().finish(),
                };

                let worker_conn = match worker::POOL.get().await.get().await {
                    Ok(x) => x,
                    Err(_) => return HttpResponse::InternalServerError().finish(),
                };
                if worker_conn
                    .send_task(worker::get_repo::get_repo::new(repo_id))
                    .await
                    .is_err()
                {
                    return HttpResponse::InternalServerError().finish();
                }

                HttpResponse::Ok().finish()
            }

            async fn graphql_route(
                req: HttpRequest,
                payload: web::Payload,
                schema: web::Data<api::Schema>,
            ) -> Result<HttpResponse, actix_web::Error> {
                let logged_in = match req
                    .headers()
                    .get(header::AUTHORIZATION)
                    .and_then(|x| x.to_str().ok())
                {
                    Some(x) => match http_auth_basic::Credentials::from_str(x) {
                        Ok(cred) => {
                            cred.user_id == CONFIG.user && cred.password == *CONFIG.password
                        }
                        Err(_) => false,
                    },
                    None => false,
                };

                let context = api::Context {
                    db_pool: db::POOL.clone(),
                    worker_pool: worker::POOL.get().await.clone(),
                    loaders: api::context::Loaders::default(),
                    logged_in,
                };

                graphql_handler(&schema, &context, req, payload).await
            }

            HttpServer::new(move || {
                App::new()
                    .app_data(web::Data::new(api::schema()))
                    .wrap(middleware::Logger::default())
                    .wrap(middleware::Compress::default())
                    .wrap(
                        Cors::default()
                            .allow_any_origin()
                            .allowed_methods(["POST", "GET"])
                            .allowed_headers([header::AUTHORIZATION, header::ACCEPT])
                            .allowed_header(header::CONTENT_TYPE)
                            .supports_credentials()
                            .max_age(3600),
                    )
                    .service(web::resource("/webhook").route(web::post().to(webhook)))
                    .service(
                        web::resource("/graphql")
                            .route(web::post().to(graphql_route))
                            .route(web::get().to(graphql_route)),
                    )
                    .default_service(web::to(not_found))
            })
            .bind(("0.0.0.0", 8080))?
            .run()
            .await?;
        }
    }

    Ok(())
}