use crate::error;
use crate::error::WoxlfError;
use crate::game::global_data::GlobalData;
use crate::game::listener::{EventStatus, Listeners, WoxlfEvent};
use crate::game::player_data::PlayerData;
use bitflags::bitflags;
use serenity::client::Context;
use serenity::http::{CacheHttp, Http};
use serenity::model::guild::Guild;
use serenity::model::id::{ChannelId, UserId};
use serenity::model::prelude::{AttachmentType, WebhookId};
use serenity::utils::MessageBuilder;

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

impl Default for MessageSource {
    fn default() -> Self {
        Self::Automated
    }
}

#[derive(Debug, Clone)]
#[allow(dead_code)]
pub enum MessageDest {
    Player(Box<PlayerData>),
    Host,
    Broadcast,
}

impl Default for MessageDest {
    fn default() -> Self {
        Self::Broadcast
    }
}

#[derive(Debug, Clone, Eq, PartialEq)]
#[allow(dead_code)]
pub enum Median {
    DirectMessage,
    Webhook,
    StandardMessage,
}

impl Default for Median {
    fn default() -> Self {
        Self::Webhook
    }
}

bitflags! {
    #[derive(Default)]
    pub struct MsgFlags: u32 {
        const PIN_MSG      = 0b00000001;
    }
}

#[derive(Debug, Clone, Default)]
pub struct WoxlfMessage<'a> {
    pub source: MessageSource,
    pub dest: MessageDest,
    pub median: Median,
    pub content: String,
    pub attachments: Option<Vec<AttachmentType<'a>>>,
    pub flags: MsgFlags,
}

#[allow(dead_code)]
impl<'a> WoxlfMessage<'a> {
    pub fn get_profile_pic(&self, global_data: &GlobalData) -> Result<String, WoxlfError> {
        Ok(match &self.source {
            MessageSource::Player(p) => p.profile_pic_url.clone(),
            MessageSource::Host | MessageSource::Automated => {
                global_data.game_cfg()?.bot_profile_pic.clone()
            }
        })
    }

    pub fn get_message_username(&self, global_data: &GlobalData) -> Result<String, WoxlfError> {
        Ok(match &self.source {
            MessageSource::Player(p) => p.codename.clone(),
            MessageSource::Host => global_data.game_cfg()?.bot_name.clone(),
            MessageSource::Automated => "Woxlf System Message".to_string(),
        })
    }

    pub fn source(mut self, source: MessageSource) -> Self {
        self.source = source;
        self
    }

    pub fn dest(mut self, dest: MessageDest) -> Self {
        self.dest = dest;
        self
    }

    pub fn median(mut self, median: Median) -> Self {
        self.median = median;
        self
    }

    pub fn content(mut self, content: &str) -> Self {
        self.content = content.to_string();
        self
    }

    pub fn attachments(mut self, attachments: Vec<AttachmentType<'a>>) -> Self {
        self.attachments = Some(attachments);
        self
    }

    pub fn flags(mut self, flags: MsgFlags) -> Self {
        self.flags = flags;
        self
    }

    pub fn pin(mut self) -> Self {
        self.flags |= MsgFlags::PIN_MSG;
        self
    }
}

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
}

pub async fn send_webhook_msg(
    http: &Http,
    webhook_id: WebhookId,
    username: &str,
    profile_pic_url: Option<String>,
    msg: &str,
    attachments: &Option<Vec<AttachmentType<'_>>>,
) -> error::Result<()> {
    let webhook = http.get_webhook(webhook_id.0).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(())
}

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

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

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

            msg
        })
        .await?;

    Ok(())
}

pub async fn send_to_host_channel(
    http: &Http,
    guild: &Guild,
    global_data: &GlobalData,
    msg: WoxlfMessage<'_>,
) -> 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.median {
        Median::DirectMessage => {
            if let MessageDest::Player(dest_player) = &msg.dest {
                let name = guild
                    .members
                    .get(&UserId::from(dest_player.discord_id))
                    .unwrap()
                    .display_name();
                format!(" to {} ({})", dest_player.codename, name)
            } else {
                "".to_string()
            }
        }
        _ => "".to_string(),
    };

    let host_channel_username = format!(
        "{} ({}){}",
        msg.get_message_username(global_data)?,
        source,
        dest
    );

    send_webhook_msg(
        http,
        WebhookId::from(global_data.cfg.discord_config.host_webhook_id),
        &host_channel_username,
        Some(msg.get_profile_pic(global_data)?),
        &msg.content,
        &msg.attachments,
    )
    .await?;
    Ok(())
}

pub async fn send_message(
    ctx: &Context,
    global_data: &GlobalData,
    msg: &WoxlfMessage<'_>,
    dest_player: &PlayerData,
) -> Result<(), WoxlfError> {
    match &msg.median {
        Median::Webhook => {
            send_webhook_msg(
                &ctx.http,
                WebhookId::from(dest_player.channel_webhook_id),
                &msg.get_message_username(global_data)?,
                Some(msg.get_profile_pic(global_data)?),
                &msg.content,
                &msg.attachments,
            )
            .await?;
        }
        Median::DirectMessage => {
            let dm_msg = MessageBuilder::new()
                .push_bold_line_safe(format!(
                    "{} has sent you a private message:",
                    &msg.get_message_username(global_data)?
                ))
                .push(&msg.content)
                .build();

            send_private_message(
                &ctx.http,
                UserId(dest_player.discord_id),
                &dm_msg,
                &msg.attachments,
            )
            .await?;
        }
        Median::StandardMessage => {
            let channel = ChannelId::from(dest_player.channel);
            channel.say(&ctx.http(), &msg.content).await?;
        }
    };

    Ok(())
}

/// Send a message to the proper channels
/// Note safe to use in an event handler
pub async fn dispatch_message(
    ctx: &Context,
    global_data: &mut GlobalData,
    msg: WoxlfMessage<'_>,
) -> error::Result<()> {
    let data = ctx.data.read().await;
    let listeners = data.get::<Listeners>().unwrap();
    let mut listeners = listeners.lock().await;

    if listeners
        .process_event(ctx, global_data, WoxlfEvent::Chat(msg.clone()))
        .await?
        == EventStatus::Canceled
    {
        return Ok(());
    };

    let msg_tasks = global_data
        .game_state()?
        .player_data
        .iter()
        .filter(|player| filter_source_channel(player, &msg.source))
        .filter(|player| match &msg.dest {
            MessageDest::Player(dest_user) => dest_user.discord_id == player.discord_id,
            MessageDest::Host => false,
            MessageDest::Broadcast => true,
        })
        .map(|p| send_message(ctx, global_data, &msg, p));

    let results: Result<(), WoxlfError> = futures::future::join_all(msg_tasks)
        .await
        .into_iter()
        .collect();

    results?;

    Ok(())
}