#[macro_use]
extern crate rocket;

mod consts;
#[macro_use]
mod macros;
mod catchers;
mod guards;
mod routes;

use std::{env, path::Path};

use oauth2::{basic::BasicClient, AuthUrl, ClientId, ClientSecret, RedirectUrl, TokenUrl};
use rocket::{
    fs::FileServer,
    http::CookieJar,
    serde::json::{json, Value as JsonValue},
    tokio::sync::broadcast::Sender,
};
use rocket_dyn_templates::Template;
use serenity::{
    client::Context,
    http::CacheHttp,
    model::id::{GuildId, UserId},
};
use sqlx::{MySql, Pool};

use crate::consts::{CNC_GUILD, DISCORD_OAUTH_AUTHORIZE, DISCORD_OAUTH_TOKEN, SUBSCRIPTION_ROLES};

type Database = MySql;

#[derive(Debug)]
enum Error {
    SQLx(sqlx::Error),
    Serenity(serenity::Error),
}

pub async fn initialize(
    kill_channel: Sender<()>,
    serenity_context: Context,
    db_pool: Pool<Database>,
) -> Result<(), Box<dyn std::error::Error>> {
    info!("Checking environment variables...");

    if env::var("OFFLINE").map_or(true, |v| v != "1") {
        env::var("OAUTH2_CLIENT_ID").expect("`OAUTH2_CLIENT_ID' not supplied");
        env::var("OAUTH2_CLIENT_SECRET").expect("`OAUTH2_CLIENT_SECRET' not supplied");
        env::var("OAUTH2_DISCORD_CALLBACK").expect("`OAUTH2_DISCORD_CALLBACK' not supplied");
        env::var("PATREON_GUILD_ID").expect("`PATREON_GUILD_ID' not supplied");
    }

    info!("Done!");

    let oauth2_client = BasicClient::new(
        ClientId::new(env::var("OAUTH2_CLIENT_ID")?),
        Some(ClientSecret::new(env::var("OAUTH2_CLIENT_SECRET")?)),
        AuthUrl::new(DISCORD_OAUTH_AUTHORIZE.to_string())?,
        Some(TokenUrl::new(DISCORD_OAUTH_TOKEN.to_string())?),
    )
    .set_redirect_uri(RedirectUrl::new(env::var("OAUTH2_DISCORD_CALLBACK")?)?);

    let reqwest_client = reqwest::Client::new();

    let static_path =
        if Path::new("web/static").exists() { "web/static" } else { "/lib/reminder-rs/static" };

    rocket::build()
        .attach(Template::fairing())
        .register(
            "/",
            catchers![
                catchers::not_authorized,
                catchers::forbidden,
                catchers::not_found,
                catchers::internal_server_error,
                catchers::unprocessable_entity,
                catchers::payload_too_large,
            ],
        )
        .manage(oauth2_client)
        .manage(reqwest_client)
        .manage(serenity_context)
        .manage(db_pool)
        .mount("/static", FileServer::from(static_path))
        .mount(
            "/",
            routes![
                routes::index,
                routes::cookies,
                routes::privacy,
                routes::terms,
                routes::return_to_same_site,
                routes::report::report_error,
            ],
        )
        .mount(
            "/help",
            routes![
                routes::help,
                routes::help_timezone,
                routes::help_create_reminder,
                routes::help_delete_reminder,
                routes::help_timers,
                routes::help_todo_lists,
                routes::help_macros,
                routes::help_intervals,
                routes::help_dashboard,
                routes::help_iemanager,
            ],
        )
        .mount(
            "/login",
            routes![
                routes::login::discord_login,
                routes::login::discord_logout,
                routes::login::discord_callback
            ],
        )
        .mount(
            "/dashboard",
            routes![
                routes::dashboard::dashboard,
                routes::dashboard::dashboard_home,
                routes::dashboard::api::user::get_user_info,
                routes::dashboard::api::user::update_user_info,
                routes::dashboard::api::user::get_user_guilds,
                routes::dashboard::api::guild::get_guild_info,
                routes::dashboard::api::guild::get_guild_channels,
                routes::dashboard::api::guild::get_guild_roles,
                routes::dashboard::api::guild::get_reminder_templates,
                routes::dashboard::api::guild::create_reminder_template,
                routes::dashboard::api::guild::delete_reminder_template,
                routes::dashboard::api::guild::create_guild_reminder,
                routes::dashboard::api::guild::get_reminders,
                routes::dashboard::api::guild::edit_reminder,
                routes::dashboard::api::guild::delete_reminder,
                routes::dashboard::export::export_reminders,
                routes::dashboard::export::export_reminder_templates,
                routes::dashboard::export::export_todos,
                routes::dashboard::export::import_reminders,
                routes::dashboard::export::import_todos,
            ],
        )
        .mount("/admin", routes![routes::admin::admin_dashboard_home, routes::admin::bot_data])
        .launch()
        .await?;

    warn!("Exiting rocket runtime");
    // distribute kill signal
    match kill_channel.send(()) {
        Ok(_) => {}
        Err(e) => {
            error!("Failed to issue kill signal: {:?}", e);
        }
    }

    Ok(())
}

pub async fn check_subscription(cache_http: impl CacheHttp, user_id: impl Into<UserId>) -> bool {
    offline!(true);

    if let Some(subscription_guild) = *CNC_GUILD {
        let guild_member = GuildId(subscription_guild).member(cache_http, user_id).await;

        if let Ok(member) = guild_member {
            for role in member.roles {
                if SUBSCRIPTION_ROLES.contains(role.as_u64()) {
                    return true;
                }
            }
        }

        false
    } else {
        true
    }
}

pub async fn check_guild_subscription(
    cache_http: impl CacheHttp,
    guild_id: impl Into<GuildId>,
) -> bool {
    offline!(true);

    if let Some(guild) = cache_http.cache().unwrap().guild(guild_id) {
        let owner = guild.owner_id;

        check_subscription(&cache_http, owner).await
    } else {
        false
    }
}

pub async fn check_authorization(
    cookies: &CookieJar<'_>,
    ctx: &Context,
    guild: u64,
) -> Result<(), JsonValue> {
    let user_id = cookies.get_private("userid").map(|c| c.value().parse::<u64>().ok()).flatten();

    if std::env::var("OFFLINE").map_or(true, |v| v != "1") {
        match user_id {
            Some(user_id) => {
                let admin_id = std::env::var("ADMIN_ID")
                    .map_or(false, |u| u.parse::<u64>().map_or(false, |u| u == user_id));

                if admin_id {
                    return Ok(());
                }

                match GuildId(guild).to_guild_cached(ctx) {
                    Some(guild) => {
                        let member_res = guild.member(ctx, UserId(user_id)).await;

                        match member_res {
                            Err(_) => {
                                return Err(json!({"error": "User not in guild"}));
                            }

                            Ok(member) => {
                                let permissions_res = member.permissions(ctx);

                                match permissions_res {
                                    Err(_) => {
                                        return Err(json!({"error": "Couldn't fetch permissions"}));
                                    }

                                    Ok(permissions) => {
                                        if !(permissions.manage_messages()
                                            || permissions.manage_guild()
                                            || permissions.administrator())
                                        {
                                            return Err(json!({"error": "Incorrect permissions"}));
                                        }
                                    }
                                }
                            }
                        }
                    }

                    None => {
                        return Err(json!({"error": "Bot not in guild"}));
                    }
                }
            }

            None => {
                return Err(json!({"error": "User not authorized"}));
            }
        }
    }

    Ok(())
}