use log::{info, warn};

use rocket::{form::Form, get, post, response::{Redirect, Flash}, uri, FromForm, request::FlashMessage, State};
use rocket_dyn_templates::{context, Template};

use crate::sbot;
use crate::utils;
use crate::db::{Database, Peer};

#[derive(FromForm)]
pub struct PeerForm {
    pub public_key: String,
}

#[get("/")]
pub async fn home(flash: Option<FlashMessage<'_>>) -> Template {
    let whoami = match sbot::whoami().await {
        Ok(id) => id,
        Err(e) => format!("whoami call failed: {}", e),
    };
    Template::render("base", context! { whoami, flash })
}

#[get("/about")]
pub async fn about_start() -> Template {
    Template::render("about", context! {})
}

#[post("/about", data = "<peer>")]
pub async fn about_form(peer: Form<PeerForm>) -> Result<Template, Flash<Redirect>> {
    info!("Showing follow information about peer {}", &peer.public_key);

    let whoami = match sbot::whoami().await {
        Ok(value) => value,
        Err(e) => return Err(Flash::error(Redirect::to(uri!(about_start)), e)),
    };

    if let Err(e) = utils::validate_public_key(&peer.public_key) {
        let validation_err_msg = format!("Public key {} is invalid: {}", &peer.public_key, e);
        warn!("{}", validation_err_msg);
        return Err(Flash::error(Redirect::to(uri!(about_start)), validation_err_msg));
    }
    info!("Public key {} is valid.", &peer.public_key);

    let follow_status = match sbot::is_following(&whoami, &peer.public_key).await {
        Ok(status) => status,
        Err(e) => {
            warn!("{}", e);
            return Err(Flash::error(Redirect::to(uri!(about_start)), e));
        }
    };
    let success_msg = format!("Follow status for {} : '{}'", &peer.public_key, follow_status);
    info!("{}", success_msg);

    Ok(Template::render("about", context! { whoami, peer_pubkey: &peer.public_key, status: follow_status }))

}

#[post("/subscribe", data = "<peer>")]
pub async fn subscribe_form(db: &State<Database>, peer: Form<PeerForm>) -> Result<Redirect, Flash<Redirect>> {
    info!("Subscribing to peer {}", &peer.public_key);
    if let Err(e) = utils::validate_public_key(&peer.public_key) {
        let validation_err_msg = format!("Public key {} is invalid: {}", &peer.public_key, e);
        warn!("{}", validation_err_msg);
        return Err(Flash::error(Redirect::to(uri!(home)), validation_err_msg));
    } else {
        info!("Public key {} is valid.", &peer.public_key);

        let peer_name = match sbot::get_name(&peer.public_key).await {
            Ok(name) => name,
            Err(e) => { 
                warn!("Failed to fetch name for peer {}: {}", &peer.public_key, e);
                String::from("")
            }
        };
        let peer_info = Peer::new(&peer.public_key).set_name(&peer_name);

        match sbot::follow_if_not_following(&peer.public_key).await {
            Ok(_) => {
                if db.add_peer(peer_info).is_ok() {
                    info!("Added {} to 'peers' database tree", &peer.public_key);
                } else {
                    let err_msg = format!("Failed to add peer {} to 'peers' database tree.",
                        &peer.public_key
                    );
                    warn!("{}", err_msg);
                    return Err(Flash::error(Redirect::to(uri!(home)), err_msg));
                }
            },
            Err(e) => {
                warn!("{}", e);
                return Err(Flash::error(Redirect::to(uri!(home)), e));
            }
        }
    }
    Ok(Redirect::to(uri!(home)))
}

#[post("/unsubscribe", data = "<peer>")]
pub async fn unsubscribe_form(db: &State<Database>, peer: Form<PeerForm>) ->  Result<Redirect, Flash<Redirect>> {
    info!("Unsubscribing to peer {}", &peer.public_key);
    if let Err(e) = utils::validate_public_key(&peer.public_key) {
        let validation_err_msg = format!("Public key {} is invalid: {}", &peer.public_key, e);
        warn!("{}", validation_err_msg);
        return Err(Flash::error(Redirect::to(uri!(home)), validation_err_msg));
    } else {
        info!("Public key {} is valid.", &peer.public_key);
        match sbot::unfollow_if_not_following(&peer.public_key).await {
            Ok(_) => {
                if db.remove_peer(&peer.public_key).is_ok() {
                    info!("Removed peer {} from 'peers' database tree.", &peer.public_key);
                } else {
                    warn!("Failed to remove peer {} from 'peers' database tree", &peer.public_key);
                }
            },
            Err(e) => {
                warn!("{}", e);
                return Err(Flash::error(Redirect::to(uri!(home)), e));
            }
        }
    }
    Ok(Redirect::to(uri!(home)))
}