/*
 * Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
use actix_identity::Identity;
use actix_web::{web, HttpRequest, HttpResponse, Responder};
use serde::{Deserialize, Serialize};
use tracing::info;
use url::Url;

use super::get_auth_middleware;
use crate::{errors::*, AppCtx};

pub mod routes {
    use crate::ctx::Ctx;

    pub struct Forgejo {
        pub add_webhook: &'static str,
        pub view_webhook: &'static str,
        pub list_webhooks: &'static str,
        pub webhook: &'static str,
    }

    impl Forgejo {
        pub const fn new() -> Self {
            Self {
                add_webhook: "/api/v1/forgejo/webhook/add",
                list_webhooks: "/api/v1/forgejo/webhook/add",
                view_webhook: "/api/v1/forgejo/webhook/view/{auth_token}",
                webhook: "/api/v1/forgejo/webhook/event/new",
            }
        }

        pub fn get_view(&self, auth_token: &str) -> String {
            self.view_webhook.replace("{auth_token}", auth_token)
        }

        pub fn get_webhook_url(&self, ctx: &Ctx, auth_token: &str) -> String {
            format!(
                "https://{}{}?auth={auth_token}",
                &ctx.settings.server.domain, self.webhook
            )
        }
    }
}

#[derive(Serialize, Deserialize)]
pub struct AddWebhook {
    pub forgejo_url: Url,
}

#[actix_web_codegen_const_routes::post(
    path = "crate::V1_API_ROUTES.forgejo.add_webhook",
    wrap = "get_auth_middleware()"
)]
#[tracing::instrument(name = "Add webhook" skip(id, ctx, payload))]
async fn add_webhook(
    ctx: AppCtx,
    id: Identity,
    payload: web::Json<AddWebhook>,
) -> ServiceResult<impl Responder> {
    info!(
        "Adding webhook for Forgejo instance: {}",
        payload.forgejo_url.as_str()
    );
    let owner = id.identity().unwrap();
    let payload = payload.into_inner();
    let hook = ctx.db.new_webhook(payload.forgejo_url, &owner).await?;
    Ok(HttpResponse::Ok().json(hook))
}

#[actix_web_codegen_const_routes::get(
    path = "crate::V1_API_ROUTES.forgejo.list_webhooks",
    wrap = "get_auth_middleware()"
)]
#[tracing::instrument(name = "Delete webhook" skip(id, ctx))]
async fn list_webhooks(ctx: AppCtx, id: Identity) -> ServiceResult<impl Responder> {
    let owner = id.identity().unwrap();
    info!("Getting all webhooks created by {}", owner);
    let hooks = ctx.db.list_all_webhooks_with_owner(&owner).await?;
    Ok(HttpResponse::Ok().json(hooks))
}

#[actix_web_codegen_const_routes::get(
    path = "crate::V1_API_ROUTES.forgejo.view_webhook",
    wrap = "get_auth_middleware()"
)]
#[tracing::instrument(name = "Delete webhook" skip(id, ctx, path))]
async fn view_webhook(
    ctx: AppCtx,
    id: Identity,
    path: web::Path<String>,
) -> ServiceResult<impl Responder> {
    let path = path.into_inner();
    let owner = id.identity().unwrap();
    info!("Gitting webhook webhook for Forgejo instance: {}", path,);
    let hook = ctx.db.get_webhook_with_owner(&path, &owner).await?;
    Ok(HttpResponse::Ok().json(hook))
}

#[derive(Serialize, Deserialize)]
struct Auth {
    auth: String,
}

#[actix_web_codegen_const_routes::post(path = "crate::V1_API_ROUTES.forgejo.webhook")]
#[tracing::instrument(name = "Update ", skip(body, ctx, req, q))]
async fn webhook(
    ctx: AppCtx,
    body: web::Bytes,
    req: HttpRequest,
    q: web::Query<Auth>,
) -> ServiceResult<impl Responder> {
    ctx.process_webhook(&body, &req, &q.auth).await?;
    Ok(HttpResponse::Ok())
}

pub fn services(cfg: &mut web::ServiceConfig) {
    cfg.service(add_webhook);
    cfg.service(view_webhook);
    cfg.service(list_webhooks);
    cfg.service(webhook);
}

#[cfg(test)]
mod tests {
    use actix_web::{error::ResponseError, http::StatusCode, test};
    use hmac::Mac;

    use crate::ctx::api::v1::forgejo::{HmacSha256, WebhookPayload};
    use crate::db::ForgejoWebhook;
    use crate::tests;
    use crate::*;

    use super::*;

    #[actix_rt::test]
    async fn test_api_forgejo_webhook() {
        const NAME: &str = "apiforgejowebhookuser";
        const PASSWORD: &str = "longpasswordasdfa2";
        const EMAIL: &str = "apiforgejowebhookuser@a.com";

        let (_dir, ctx) = tests::get_ctx().await;
        let _ = ctx.delete_user(NAME, PASSWORD).await;
        let (_, signin_resp) = ctx.register_and_signin(NAME, EMAIL, PASSWORD).await;
        let page = ctx.add_test_site(NAME.into()).await;
        let cookies = get_cookie!(signin_resp);
        let app = get_app!(ctx).await;

        let payload = AddWebhook {
            forgejo_url: Url::parse("https://git.batnsense.net").unwrap(),
        };

        let add_webhook_resp = test::call_service(
            &app,
            post_request!(&payload, V1_API_ROUTES.forgejo.add_webhook)
                .cookie(cookies.clone())
                .to_request(),
        )
        .await;
        check_status!(add_webhook_resp, StatusCode::OK);
        let response: ForgejoWebhook = actix_web::test::read_body_json(add_webhook_resp).await;
        assert_eq!(response.forgejo_url, payload.forgejo_url);

        let view_webhook_resp = get_request!(
            &app,
            &V1_API_ROUTES.forgejo.get_view(&response.auth_token),
            cookies.clone()
        );
        check_status!(view_webhook_resp, StatusCode::OK);
        let hook: ForgejoWebhook = actix_web::test::read_body_json(view_webhook_resp).await;
        assert_eq!(hook, response);

        let list_all_webhooks_resp =
            get_request!(&app, &V1_API_ROUTES.forgejo.list_webhooks, cookies.clone());
        check_status!(list_all_webhooks_resp, StatusCode::OK);
        let hooks: Vec<ForgejoWebhook> =
            actix_web::test::read_body_json(list_all_webhooks_resp).await;
        assert_eq!(vec![hook.clone()], hooks);

        let webhook_url = format!("{}?auth={}", V1_API_ROUTES.forgejo.webhook, hook.auth_token);

        // test webhook
        let mut webhook_payload = WebhookPayload::default();
        webhook_payload.reference = format!("refs/origin/{}", page.branch);
        webhook_payload.repository.html_url = page.repo;

        let body = serde_json::to_string(&webhook_payload).unwrap();
        let body = body.as_bytes();
        let mut mac = HmacSha256::new_from_slice(hook.forgejo_webhook_secret.as_bytes())
            .expect("HMAC can take key of any size");
        mac.update(&body);
        let res = mac.finalize();
        let sig = res.into_bytes();
        let sig = hex::encode(&sig[..]);

        let post_to_webhook_resp = test::call_service(
            &app,
            post_request!(&webhook_payload, &webhook_url)
                .insert_header(("X-Gitea-Delivery", "foobar213randomuuid"))
                .insert_header(("X-Gitea-Signature", sig.clone()))
                .insert_header(("X-Gitea-Event", "push"))
                .cookie(cookies.clone())
                .to_request(),
        )
        .await;
        check_status!(post_to_webhook_resp, StatusCode::OK);

        // no webhook
        let fake_webhook_url = format!(
            "{}?auth={}",
            V1_API_ROUTES.forgejo.webhook, hook.forgejo_webhook_secret
        );
        let body = serde_json::to_string(&webhook_payload).unwrap();
        let body = body.as_bytes();
        let mut mac =
            HmacSha256::new_from_slice(b"nosecret").expect("HMAC can take key of any size");
        mac.update(&body);
        let res = mac.finalize();
        let fake_sig = res.into_bytes();
        let fake_sig = hex::encode(&fake_sig[..]);

        let post_to_no_exist_webhook_resp = test::call_service(
            &app,
            post_request!(&webhook_payload, &fake_webhook_url)
                .insert_header(("X-Gitea-Delivery", "foobar213randomuuid"))
                .insert_header(("X-Gitea-Signature", fake_sig))
                .insert_header(("X-Gitea-Event", "push"))
                .cookie(cookies.clone())
                .to_request(),
        )
        .await;
        let err = ServiceError::WebhookNotFound;
        assert_eq!(post_to_no_exist_webhook_resp.status(), err.status_code());
        let resp_err: ErrorToResponse =
            actix_web::test::read_body_json(post_to_no_exist_webhook_resp).await;
        assert_eq!(resp_err.error, err.to_string());

        // no website
        let mut webhook_payload = WebhookPayload::default();
        webhook_payload.reference = format!("refs/origin/{}", page.branch);
        webhook_payload.repository.html_url = "https://no-exist-git.example.org".into();

        let body = serde_json::to_string(&webhook_payload).unwrap();
        let body = body.as_bytes();
        let mut mac = HmacSha256::new_from_slice(hook.forgejo_webhook_secret.as_bytes())
            .expect("HMAC can take key of any size");
        mac.update(&body);
        let res = mac.finalize();
        let sig = res.into_bytes();
        let sig = hex::encode(&sig[..]);

        let post_to_no_website_webhook_resp = test::call_service(
            &app,
            post_request!(&webhook_payload, &webhook_url)
                .insert_header(("X-Gitea-Delivery", "foobar213randomuuid"))
                .insert_header(("X-Gitea-Signature", sig.clone()))
                .insert_header(("X-Gitea-Event", "push"))
                .cookie(cookies.clone())
                .to_request(),
        )
        .await;

        let err = ServiceError::WebsiteNotFound;
        assert_eq!(post_to_no_website_webhook_resp.status(), err.status_code());
        let resp_err: ErrorToResponse =
            actix_web::test::read_body_json(post_to_no_website_webhook_resp).await;
        assert_eq!(resp_err.error, err.to_string());
    }
}