use crate::error;
use crate::game::global_data::GlobalData;
use crate::game::player_data::PlayerData;
use serenity::client::Context;
use serenity::http::Http;
use serenity::model::guild::Guild;
use serenity::model::id::UserId;
use serenity::model::prelude::AttachmentType;
use serenity::utils::MessageBuilder;

#[derive(Debug, Clone)]
pub enum MessageSource {
    Player(Box<PlayerData>),
    Host,
    Automated,
}

#[derive(Debug, Clone)]
pub enum MessageDest {
    PlayerChannel(Box<PlayerData>),
    PlayerDm(Box<PlayerData>),
    Broadcast,
}


fn filter_source_channel(player_data: &&PlayerData, msg_source: &MessageSource) -> bool {
    if let MessageSource::Player(source_player) = &msg_source {
        if source_player.channel == player_data.channel {
            return false;
        }
    }
    true
}

async fn send_webhook_msg(
    http: &Http,
    webhook_id: u64,
    username: &str,
    profile_pic_url: Option<String>,
    msg: &str,
    attachments: &Option<Vec<AttachmentType<'_>>>,
) -> error::Result<()> {
    let webhook = http.get_webhook(webhook_id).await?;

    webhook
        .execute(http, false, move |w| {
            w.content(&msg).username(username);

            if let Some(profile_pic_url) = profile_pic_url {
                w.avatar_url(profile_pic_url);
            }

            if let Some(attachments) = attachments {
                w.add_files(attachments.clone());
            }

            w
        })
        .await?;

    Ok(())
}

async fn send_private_message(
    http: &Http,
    src_username: &str,
    dest: UserId,
    msg: &str,
    attachments: &Option<Vec<AttachmentType<'_>>>,
) -> error::Result<()> {
    let dest_user = dest.to_user(http).await?;

    let mut dm_message = MessageBuilder::new();

    dm_message.push_bold_line_safe(format!("{} has sent you a DM:", src_username));
    dm_message.push(msg);

    dest_user
        .dm(http, |msg| {
            msg.content(dm_message);

            if let Some(attachments) = attachments {
                msg.add_files(attachments.clone());
            }

            msg
        })
        .await?;

    Ok(())
}

async fn send_to_host_channel(
    http: &Http,
    guild: &Guild,
    global_data: &mut GlobalData,
    msg_username: &str,
    msg_source: MessageSource,
    msg_dest: MessageDest,
    profile_pic_url: Option<String>,
    msg: &str,
    attachments: &Option<Vec<AttachmentType<'_>>>,
) -> error::Result<()> {
    let source = match &msg_source {
        MessageSource::Player(player_data) => {
            let name = guild
                .members
                .get(&UserId::from(player_data.discord_id))
                .unwrap()
                .display_name();

            name.to_string()
        }
        MessageSource::Host => "Host".to_string(),
        MessageSource::Automated => "Automated".to_string(),
    };

    let dest = match &msg_dest {
        MessageDest::PlayerChannel(p) | MessageDest::PlayerDm(p) => {
            let name = guild
                .members
                .get(&UserId::from(p.discord_id))
                .unwrap()
                .display_name();

            format!(" to {} ({})", p.codename, name)
        }
        MessageDest::Broadcast => "".to_string(),
    };

    let host_channel_username = format!("{} ({}){}", msg_username, source, dest);

    send_webhook_msg(
        http,
        global_data.cfg.discord_config.host_webhook_id,
        &host_channel_username,
        profile_pic_url,
        msg,
        attachments,
    )
    .await?;
    Ok(())
}

pub async fn dispatch_message(
    ctx: &Context,
    guild: &Guild,
    global_data: &mut GlobalData,
    msg_source: MessageSource,
    msg_dest: MessageDest,
    msg: &str,
    attachments: Option<Vec<AttachmentType<'_>>>,
) -> error::Result<()> {
    let msg_username = match &msg_source {
        MessageSource::Player(p) => p.codename.clone(),
        MessageSource::Host => "Woxlf".to_string(),
        MessageSource::Automated => "Woxlf System Message".to_string(),
    };

    let profile_pic = match &msg_source {
        MessageSource::Player(p) => Some(p.profile_pic_url.clone()),
        MessageSource::Host | MessageSource::Automated => {
            Some(global_data.game_cfg()?.bot_profile_pic.clone())
        }
    };

    let msg_tasks: Vec<&PlayerData> = global_data
        .game_state_mut()?
        .player_data
        .iter()
        .filter(|player| filter_source_channel(player, &msg_source))
        .collect();

    for player_data in msg_tasks {
        match &msg_dest {
            MessageDest::PlayerChannel(dest_player) => {
                if dest_player.discord_id == player_data.discord_id {
                    send_webhook_msg(
                        &ctx.http,
                        player_data.channel_webhook_id,
                        &msg_username,
                        profile_pic.clone(),
                        msg,
                        &attachments,
                    )
                    .await?;
                }
            }
            MessageDest::PlayerDm(dest_player) => {
                send_private_message(
                    &ctx.http,
                    &msg_username,
                    UserId(dest_player.discord_id),
                    msg,
                    &attachments,
                )
                .await?
            }
            MessageDest::Broadcast => {
                send_webhook_msg(
                    &ctx.http,
                    player_data.channel_webhook_id,
                    &msg_username,
                    profile_pic.clone(),
                    msg,
                    &attachments,
                )
                .await?
            }
        }
    }

    send_to_host_channel(
        &ctx.http,
        guild,
        global_data,
        &msg_username,
        msg_source,
        msg_dest,
        profile_pic,
        msg,
        &attachments,
    )
    .await?;

    Ok(())
}