#[macro_use]
extern crate lazy_static;

#[macro_use]
extern crate log;
extern crate indexmap;
extern crate simplelog;
#[macro_use]
extern crate guard;

#[macro_use]
extern crate diesel;
extern crate ldap3;

use simplelog::*;
use std::fs::File;

use chrono::prelude::Utc;
use serenity::{
    model::{channel, channel::Message, gateway::Ready, guild::Member},
    prelude::*,
    utils::MessageBuilder,
};

#[macro_use]
mod util;
mod config;
mod database;
mod ldap;
mod reaction_roles;
mod token_management;
mod user_management;
mod voting;

use config::{CONFIG, SECRETS};
use reaction_roles::{add_role_by_reaction, remove_role_by_reaction};
use util::get_string_from_react;

struct Handler;

impl EventHandler for Handler {
    // Set a handler for the `message` event - so that whenever a new message
    // is received - the closure (or function) passed will be called.
    //
    // Event handlers are dispatched through a threadpool, and so multiple
    // events can be dispatched simultaneously.
    fn message(&self, ctx: Context, msg: Message) {
        if !(msg.content.starts_with(&CONFIG.command_prefix)) {
            return;
        }
        let message_content: Vec<_> = msg.content[1..].splitn(2, ' ').collect();
        let content = if message_content.len() > 1 {
            message_content[1]
        } else {
            ""
        };
        match message_content[0] {
            "say" => println!("{:#?}", msg.content),
            "register" => user_management::Commands::register(ctx, msg.clone(), content),
            "verify" => user_management::Commands::verify(ctx, msg.clone(), content),
            "profile" => user_management::Commands::profile(ctx, msg.clone(), content),
            "set" => user_management::Commands::set_info(ctx, msg.clone(), content),
            "clear" => user_management::Commands::clear_info(ctx, msg.clone(), content),
            "move" => voting::Commands::move_something(ctx, msg.clone(), content),
            "motion" => voting::Commands::motion(ctx, msg.clone(), content),
            "poll" => voting::Commands::poll(ctx, msg.clone(), content),
            "cowsay" => voting::Commands::cowsay(ctx, msg.clone(), content),
            "logreact" => {
                e!("Error deleting logreact prompt: {:?}", msg.delete(&ctx));
                send_message!(
                    msg.channel_id,
                    &ctx.http,
                    "React to this to log the ID (for the next 5min)"
                );
            }
            "help" => {
                // Plaintext version, keep in case IRC users kick up a fuss
                // let mut message = MessageBuilder::new();
                // message.push_line(format!(
                //     "Use {}move <action> to make a circular motion",
                //     &CONFIG.command_prefix
                // ));
                // message.push_line(format!(
                //     "Use {}poll <proposal> to see what people think about something",
                //     &CONFIG.command_prefix
                // ));
                // send_message!(msg.channel_id, &ctx.http, message.build());

                let result = msg.channel_id.send_message(&ctx.http, |m| {
                    m.embed(|embed| {
                        embed.colour(serenity::utils::Colour::DARK_GREY);
                        embed.title("Commands for the UCC Bot");
                        embed.field("About", "This is UCC's own little in-house bot, please treat it nicely :)", false);
                        embed.field("Commitee", "`!move <text>` to make a circular motion\n\
                                                 `!poll <text>` to get people's opinions on something", false);
                        embed.field("Account", "`!register <ucc username>` to link your Discord and UCC account\n\
                                                `!profile <user>` to get the profile of a user\n\
                                                `!set <bio|git|web|photo>` to set that property of _your_ profile", false);
                        embed.field("Fun", "`!cowsay <text>` to have a cow say your words\n\
                                            with no `<text>` it'll give you a fortune 😉", false);
                        embed
                    });
                    m
                });
                if let Err(why) = result {
                    error!("Error sending help embed: {:?}", why);
                }
            }
            // undocumented (in !help) functins
            "ldap" => send_message!(
                msg.channel_id,
                &ctx.http,
                format!("{:?}", ldap::ldap_search(message_content[1]))
            ),
            "tla" => send_message!(
                msg.channel_id,
                &ctx.http,
                format!("{:?}", ldap::tla_search(message_content[1]))
            ),
            _ => send_message!(
                msg.channel_id,
                &ctx.http,
                format!("Unrecognised command. Try {}help", &CONFIG.command_prefix)
            ),
        }
    }

    fn reaction_add(&self, ctx: Context, add_reaction: channel::Reaction) {
        match add_reaction.message(&ctx.http) {
            Ok(message) => match get_message_type(&message) {
                MessageType::RoleReactMessage if add_reaction.user_id.0 != CONFIG.bot_id => {
                    add_role_by_reaction(&ctx, message, add_reaction);
                    return
                }
                _ if message.author.id.0 != CONFIG.bot_id
                    || add_reaction.user_id == CONFIG.bot_id =>
                {
                    return
                }
                MessageType::Motion => voting::reaction_add(ctx, add_reaction),
                MessageType::LogReact => {
                    let react_user = add_reaction.user(&ctx).unwrap();
                    let react_as_string = get_string_from_react(&add_reaction.emoji);
                    if Utc::now().timestamp() - message.timestamp.timestamp() > 300 {
                        warn!(
                            "The logreact message {} just tried to use is too old",
                            react_user.name
                        );
                        return
                    }
                    info!(
                        "The react {} just added is {:?}. In full: {:?}",
                        react_user.name, react_as_string, add_reaction.emoji
                    );
                    let mut msg = MessageBuilder::new();
                    msg.push_italic(react_user.name);
                    msg.push(format!(
                        " wanted to know that {} is represented by ",
                        add_reaction.emoji,
                    ));
                    msg.push_mono(react_as_string);
                    send_message!(message.channel_id, &ctx.http, msg.build());
                }
                _ => {}
            },
            Err(why) => error!("Failed to get react message {:?}", why),
        }
    }

    fn reaction_remove(&self, ctx: Context, removed_reaction: channel::Reaction) {
        match removed_reaction.message(&ctx.http) {
            Ok(message) => match get_message_type(&message) {
                MessageType::RoleReactMessage if removed_reaction.user_id != CONFIG.bot_id => {
                    remove_role_by_reaction(&ctx, message, removed_reaction);
                    return
                }
                _ if message.author.id.0 != CONFIG.bot_id
                    || removed_reaction.user_id == CONFIG.bot_id =>
                {
                    return
                }
                MessageType::Motion => voting::reaction_remove(ctx, removed_reaction),
                _ => {}
            },
            Err(why) => error!("Failed to get react message {:?}", why),
        }
    }

    fn guild_member_addition(
        &self,
        ctx: Context,
        _guild_id: serenity::model::id::GuildId,
        the_new_member: Member,
    ) {
        user_management::new_member(&ctx, the_new_member);
    }

    // Set a handler to be called on the `ready` event. This is called when a
    // shard is booted, and a READY payload is sent by Discord. This payload
    // contains data like the current user's guild Ids, current user data,
    // private channels, and more.
    //
    // In this case, just print what the current user's username is.
    fn ready(&self, ctx: Context, ready: Ready) {
        info!("{} is connected!", ready.user.name);
        reaction_roles::sync_all_role_reactions(&ctx);
    }

    fn resume(&self, ctx: Context, _: serenity::model::event::ResumedEvent) {
        reaction_roles::sync_all_role_reactions(&ctx);
    }
}

fn main() {
    CombinedLogger::init(vec![
        TermLogger::new(LevelFilter::Info, Config::default(), TerminalMode::Mixed).unwrap(),
        WriteLogger::new(
            LevelFilter::Info,
            Config::default(),
            File::create("ucc-bot.log").unwrap(),
        ),
    ])
    .unwrap();

    // Create a new instance of the Client, logging in as a bot. This will
    // automatically prepend your bot token with "Bot ", which is a requirement
    // by Discord for bot users.
    let mut client = Client::new(&SECRETS.discord_token, Handler).expect("Err creating client");

    // Finally, start a single shard, and start listening to events.
    //
    // Shards will automatically attempt to reconnect, and will perform
    // exponential backoff until it reconnects.
    if let Err(why) = client.start() {
        error!("Client error: {:?}", why);
    }
}

#[derive(Debug, PartialEq)]
enum MessageType {
    Motion,
    Role,
    RoleReactMessage,
    LogReact,
    Poll,
    Misc,
}

fn get_message_type(message: &Message) -> MessageType {
    if CONFIG
        .react_role_messages
        .iter()
        .any(|rrm| rrm.message == message.id)
    {
        return MessageType::RoleReactMessage;
    }
    if message.embeds.is_empty() {
        // Get first word of message
        return match message.content.splitn(2, ' ').next().unwrap() {
            "Role" => MessageType::Role,
            "React" => MessageType::LogReact,
            _ => MessageType::Misc,
        };
    }
    let title: String = message.embeds[0].title.clone().unwrap();
    let words_of_title: Vec<_> = title.splitn(2, ' ').collect();
    let first_word_of_title = words_of_title[0];
    match first_word_of_title {
        "Motion" => MessageType::Motion,
        "Poll" => MessageType::Poll,
        _ => MessageType::Misc,
    }
}