use std::sync::atomic::AtomicBool;

use poise::{Event, FrameworkContext};
use poise::futures_util::future::ok;
use poise::serenity_prelude::async_trait;
use poise::serenity_prelude::model::{
    gateway::Ready,
    id::ChannelId,
};
use poise::serenity_prelude::{Context, EventHandler, Message};
use crate::{ManifoldConfig, ManifoldContext, ManifoldData, ManifoldDataInner};
use crate::error::{ManifoldError, ManifoldResult};
use crate::models::user::UserInfo;

use crate::responses::Responses;

pub struct Handler {
    pub timer_running: AtomicBool,
}

impl Handler {
    pub fn new() -> Self {
        Handler {
            timer_running: AtomicBool::from(false)
        }
    }

    pub async fn listen(ctx: &Context, framework_ctx: FrameworkContext<'_, ManifoldData, ManifoldError>, event: &Event<'_>) -> ManifoldResult<()> {
        match event {
            Event::Ready { data_about_bot} => Handler::standard_startup(&ctx, &framework_ctx, data_about_bot).await,
            Event::Message { new_message } => Handler::message(&ctx, &framework_ctx, &new_message).await,
            Event::MessageUpdate { old_if_available, new, event } => Handler::message_edited(&ctx, &framework_ctx, old_if_available, new).await,
            _ => Ok(())
        }
    }

    pub async fn standard_startup(ctx: &Context, framework_ctx: &FrameworkContext<'_, ManifoldData, ManifoldError>, data_about_bot: &Ready) -> ManifoldResult<()> {
        let config = &framework_ctx.user_data().await.bot_config;
        let responses = &framework_ctx.user_data().await.responses;

        let greeting = match responses.get_response(&"bot startup".to_string()) {
            Some(g) => g.to_owned(),
            None => "Manifold bot connected to discord and ready to begin broadcast operations.".to_string(),
        };

        let bot_nickname = config.get_value(&"BotNickname".to_string()).unwrap_or("BrokenManifoldBot".to_string());
        let channel: ChannelId = config.get_channel(&"Log".to_string()).expect("Specified log channel invalid or unavailable");
        for guild in &data_about_bot.guilds {
            match guild.id.edit_nickname(&ctx, Some(&*bot_nickname)).await {
                Ok(()) => (),
                Err(e) => {
                    error!("Error setting bot nickname (lack permission?): {:?}", e);
                }
            }
        }

        channel.say(&ctx, greeting).await.expect("Couldn't message log channel!");

        Ok(())
    }

    async fn message(_ctx: &Context, fctx: &FrameworkContext<'_, ManifoldData, ManifoldError>, msg: &Message) -> ManifoldResult<()> {
        let userinfo = &mut fctx.user_data().await.user_info.lock().await;

        if let Some(u) = userinfo.get_mut(&msg.author.id.as_u64()) {
            u.last_seen = Some(chrono::Utc::now().timestamp());
        } else {
            let new_user = UserInfo {
                user_id: msg.author.id.as_u64().clone() as i64,
                username: msg.author.name.to_owned(),
                weather_location: None,
                weather_units: None,
                timezone: None,
                last_seen: Some(chrono::Utc::now().timestamp()),
            };

            userinfo.insert(msg.author.id.as_u64().clone(), new_user);
        }

        Ok(())
    }

    async fn message_edited(ctx: &Context, fctx: &FrameworkContext<'_, ManifoldData, ManifoldError>, original: &Option<Message>, new_message: &Option<Message>) -> ManifoldResult<()> {
        let log_channel = fctx.user_data().await.bot_config.get_channel(&"Log".to_string()).unwrap();

        if let Some(new) = new_message.as_ref() {
            log_channel.send_message(ctx, |f| {
                f
                    .content("")
                    .embed(|e| {
                        e
                            .title("Message updated")
                            .author(|a| a.name(new.author.name.clone()))
                            .timestamp(new.timestamp)
                            .field("Original Content", match original.as_ref() {
                                Some(m) => m.content.clone(),
                                None => "Not available".to_string(),
                            }, false)
                            .field("New Content", new.content.clone(), false)
                    })
            }).await?;
        }

        Ok(())
    }
}