use actix_files::{Files, NamedFile};
use actix_web::{
    body::MessageBody,
    dev::ServiceResponse,
    get,
    http::header::{HeaderValue, CACHE_CONTROL, PRAGMA},
    middleware::{ErrorHandlerResponse, ErrorHandlers},
    web::Data,
    App, HttpRequest, HttpResponse, HttpServer, ResponseError,
};
use anyhow::Error;
use askama::Template;
use log::{error, info};
use nekrochan::{
    cfg::Cfg,
    ctx::Ctx,
    db::{cache::init_cache, models::Banner},
    error::NekrochanError,
    schedule::s_cleanup_files,
    web::{self, template_response},
};
use sqlx::migrate;
use std::{env::var, time::Duration};
use tokio::time::sleep;

#[actix_web::main]
async fn main() {
    dotenv::dotenv().ok();
    env_logger::init();

    if let Err(err) = run().await {
        error!("{err:?}");
    }
}

async fn run() -> Result<(), Error> {
    let cfg_path = var("NEKROCHAN_CONFIG").unwrap_or_else(|_| "Nekrochan.toml".into());

    let cfg = Cfg::load(&cfg_path).await?;
    let ctx = Ctx::new(cfg).await?;

    migrate!().run(ctx.db()).await?;
    init_cache(&ctx).await?;

    let ctx_ = ctx.clone();

    tokio::spawn(async move {
        loop {
            match s_cleanup_files(&ctx_).await {
                Ok(()) => info!("Routine file cleanup successful."),
                Err(err) => error!("Routine file cleanup failed: {err:?}"),
            };

            sleep(Duration::from_secs(ctx_.cfg.files.cleanup_interval)).await;
        }
    });

    let bind_addr = ctx.bind_addr();

    HttpServer::new(move || {
        App::new()
            .app_data(Data::new(ctx.clone()))
            .service(web::board::board)
            .service(web::board_catalog::board_catalog)
            .service(web::index::index)
            .service(web::captcha::captcha)
            .service(web::edit_posts::edit_posts)
            .service(web::ip_posts::ip_posts)
            .service(web::live::live)
            .service(web::login::login_get)
            .service(web::login::login_post)
            .service(web::logout::logout)
            .service(web::news::news)
            .service(web::overboard::overboard)
            .service(web::overboard_catalog::overboard_catalog)
            .service(web::page::page)
            .service(web::search::search)
            .service(web::thread::thread)
            .service(web::thread_json::thread_json)
            .service(web::actions::appeal_ban::appeal_ban)
            .service(web::actions::create_post::create_post)
            .service(web::actions::edit_posts::edit_posts)
            .service(web::actions::report_posts::report_posts)
            .service(web::actions::staff_post_actions::staff_post_actions)
            .service(web::actions::user_post_actions::user_post_actions)
            .service(web::staff::account::account)
            .service(web::staff::accounts::accounts)
            .service(web::staff::bans::bans)
            .service(web::staff::banners::banners)
            .service(web::staff::board_config::board_config)
            .service(web::staff::boards::boards)
            .service(web::staff::edit_news::edit_news)
            .service(web::staff::news::news)
            .service(web::staff::permissions::permissions)
            .service(web::staff::reports::reports)
            .service(web::staff::actions::add_banners::add_banners)
            .service(web::staff::actions::change_password::change_password)
            .service(web::staff::actions::create_account::create_account)
            .service(web::staff::actions::create_board::create_board)
            .service(web::staff::actions::create_news::create_news)
            .service(web::staff::actions::delete_account::delete_account)
            .service(web::staff::actions::edit_news::edit_news)
            .service(web::staff::actions::remove_accounts::remove_accounts)
            .service(web::staff::actions::remove_banners::remove_banners)
            .service(web::staff::actions::remove_bans::remove_bans)
            .service(web::staff::actions::remove_boards::remove_boards)
            .service(web::staff::actions::remove_news::remove_news)
            .service(web::staff::actions::transfer_ownership::transfer_ownership)
            .service(web::staff::actions::update_board_config::update_board_config)
            .service(web::staff::actions::update_boards::update_boards)
            .service(web::staff::actions::update_permissions::update_permissions)
            .service(favicon)
            .service(random_banner)
            .service(Files::new("/static", "./static"))
            .service(Files::new("/uploads", "./uploads").disable_content_disposition())
            .wrap(ErrorHandlers::new().default_handler(error_handler))
    })
    .bind(bind_addr)?
    .run()
    .await?;

    Ok(())
}

#[get("/favicon.ico")]
async fn favicon() -> Result<NamedFile, NekrochanError> {
    let favicon = NamedFile::open("./static/favicon.ico")?;

    Ok(favicon)
}

#[get("/random-banner")]
async fn random_banner(ctx: Data<Ctx>, req: HttpRequest) -> Result<HttpResponse, NekrochanError> {
    let file = if let Some(banner) = Banner::read_random(&ctx).await? {
        let timestamp = banner.banner.timestamp;
        let format = &banner.banner.format;

        NamedFile::open(format!("./uploads/{timestamp}.{format}"))?
    } else {
        NamedFile::open("./static/default-banner.png")?
    };

    let mut res = file.into_response(&req);

    res.headers_mut().append(
        CACHE_CONTROL,
        HeaderValue::from_static("no-cache, no-store, must-revalidate"),
    );

    res.headers_mut()
        .append(PRAGMA, HeaderValue::from_static("no-cache"));

    Ok(res)
}

#[derive(Template)]
#[template(path = "error.html")]
struct ErrorTempalate {
    error_code: u16,
    error_message: String,
}

fn error_handler<B>(res: ServiceResponse<B>) -> actix_web::Result<ErrorHandlerResponse<B>>
where
    B: MessageBody,
    <B as MessageBody>::Error: ResponseError + 'static,
{
    let (req, res) = res.into_parts();
    let status = res.status();

    let error_code = status.as_u16();
    let error_message = match res.into_body().try_into_bytes().ok() {
        Some(bytes) => String::from_utf8(bytes.to_vec()).unwrap_or_default(),
        None => String::default(),
    };

    let template = ErrorTempalate {
        error_code,
        error_message,
    };

    let mut res = template_response(&template)?;
    *(res.status_mut()) = status;

    let res = ServiceResponse::new(req, res).map_into_right_body();

    Ok(ErrorHandlerResponse::Response(res))
}