/*
 * tmtd - Suckless To Do list
 * Copyright (C) 2022 C4TG1RL5
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

use std::sync::Arc;

use async_sqlx_session::PostgresSessionStore;
use chrono::Duration;
use sqlx::types::chrono::Utc;
use tera::{Context, Tera};
use tokio::sync::broadcast;
use tracing::info;
use warp::Filter;
use warp_sessions::{CookieOptions, SameSiteCookieOption, SessionWithStore};
use std::time::SystemTime;

use crate::{task, Config, Database};

macro_rules! warp_try {
    ($expr:expr) => {
        match $expr {
            Ok(o) => o,
            Err(e) => {
                warn!("Error in a request handler: {}", e);
                return reply::with_status(
                    format!("Error: {}", e),
                    StatusCode::INTERNAL_SERVER_ERROR,
                )
                .into_response();
            }
        }
    };

    ($store:expr, $expr:expr) => {
        match $expr {
            Ok(o) => o,
            Err(e) => {
                warn!("Error in a request handler: {}", e);
                return (
                    reply::with_status(format!("Error: {}", e), StatusCode::INTERNAL_SERVER_ERROR)
                        .into_response(),
                    $store,
                );
            }
        }
    };
}

macro_rules! warp_session {
    ($filter:expr, $store:expr, $then:expr) => {
        $filter
            .and(
                warp_sessions::request::with_session(
                    $store.clone(),
                    Some(CookieOptions {
                        cookie_name: "tmtd_sid",
                        cookie_value: None,
                        max_age: Some(86400 * 7),
                        domain: None,
                        path: None,
                        secure: true,
                        http_only: true,
                        same_site: Some(SameSiteCookieOption::Strict),
                    }),
                )
                .map(|mut s: SessionWithStore<PostgresSessionStore>| {
                    s.session.set_expiry(Utc::now() + Duration::days(7));
                    s
                }),
            )
            .then($then)
            .untuple_one()
            .and_then(warp_sessions::reply::with_session)
    };
}

pub struct App {
    config: Arc<Config>,
    db: Arc<Database>,
    session_store: PostgresSessionStore,
    tera: Arc<Tera>,
}

impl App {
    pub fn new(
        config: Arc<Config>,
        db: Arc<Database>,
        session_store: PostgresSessionStore,
    ) -> Result<Self, tera::Error> {
        Ok(Self {
            config,
            db,
            session_store,
            tera: Arc::new(Tera::new("templates/*.html")?),
        })
    }

    pub async fn run(self, mut cancel: broadcast::Receiver<()>) {
        let route = warp_session!(
            warp::path::end(),
            self.session_store,
            move |mut s: SessionWithStore<PostgresSessionStore>| async move {
                s.session.insert_raw("test", "something".into());
                (
                    warp::reply::html(format!("session id: {}", s.session.id())),
                    s,
                )
            }
        )
        // example route, remove later or something
        .or(warp::path!("hello" / String).map({
            let tera = self.tera.clone();
            move |name: String| {
                let mut ctx = Context::new();
                ctx.insert("name", &name);
                warp::reply::html(tera.render("hello.html", &ctx).unwrap())
            }
        }))
        .or(warp::path("tmtd").map({
            let tera = self.tera.clone();
            move || {
                let mut ctx = Context::new();
                let mut tasks = Vec::new();
                for _ in 0..10 {
                    let task_ctx = task::Task {
                        date: "TODO".to_string(),
                        assignee: "TODO".to_string(),
                        description: "TODO".to_string(),
                        status: "TODO".to_string(),
                        title: "TODO".to_string(),
                    };
                    tasks.push(task_ctx);
                }
                ctx.insert("tasks", &tasks);
                warp::reply::html(tera.render("task_page.html", &ctx).unwrap())
            }
        }))
        .or(warp::path("task")
            .and(warp::path("create"))
            .map({
            let tera = self.tera.clone();
            move || {
                let ctx = Context::new();
                warp::reply::html(tera.render("create_task.html", &ctx).unwrap())
            }
        }))
        .or(warp::post()
            .and(warp::path("api"))
            .and(warp::path("task"))
            .and(warp::path("move"))
            .and(warp::body::form::<task::Request>())
            .then(handle_post)
        )
        .or(warp::post()
            .and(warp::path("api"))
            .and(warp::path("task"))
            .and(warp::path("create"))
            .and(warp::body::form::<task::Create>())
            .then(handle_post_create)
        );

        let (_, server) =
            warp::serve(route).bind_with_graceful_shutdown(self.config.listen_addr, async move {
                cancel.recv().await.unwrap();
            });
        server.await;
        info!("Web app has been shut down");
    }
}

pub async fn handle_post(form: task::Request) -> impl warp::Reply {
    // TODO: intelligent SQL code here (or maybe in another function idk, it's up to the reader to
    // decide whats more intelligent)
    tracing::debug!("Got POST on /api/task/move: {}", form.r#move);
    warp::redirect(warp::http::Uri::from_static("/"))
}

pub async fn handle_post_create(form: task::Create)-> impl warp::Reply {
    let date = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
    tracing::debug!("Got POST on /api/task/create: {:?}, date: {:?}", form, date);
    warp::redirect(warp::http::Uri::from_static("/"))
}