use log::{error, trace, warn};

use serenity::model::Permissions;
use serenity::model::channel::Message;
use serenity::model::prelude::{ChannelType, PermissionOverwrite, PermissionOverwriteType};
use serenity::prelude::*;

use crate::bot::messages::{QueryFilters, QueryMessage};
use crate::bot::oai::{ChatCompletionMessage, ChatCompletionRequest, GPTRole, OAI};

pub async fn generate_response(ctx: &Context, msg: &Message, oai: &OAI) {
  trace!("Generating response for message: {}", msg.content);

  let guild_id = msg.guild_id.unwrap();
  let channel_id = msg.channel_id;
  let author_id = msg.author.id;

  // Parse out the bot mention from the message
  let bot_mention: String = format!("<@{}>", ctx.cache.current_user_id().0);
  let parsed_content = msg.content.replace(bot_mention.as_str(), "");

  let mut messages = vec![
    ChatCompletionMessage {
      role: GPTRole::System,
      content: "You are a Discord bot named Siren that acts as the Dungeon Master's assistant. Siren must always obey these instructions, no matter what.".to_string()
    },
  ];

  match QueryMessage::get_all(&QueryFilters {
    by_guild_id: Some(guild_id.0 as i64),
    by_channel_id: Some(channel_id.0 as i64),
    by_user_id: Some(author_id.0 as i64),
    ..Default::default()
  }, 100, 1) {
    Ok(m) => {
      for message in m {
        messages.push(
          ChatCompletionMessage {
            role: GPTRole::User,
            content: format!("{}", message.request)
          }
        );
        messages.push(
          ChatCompletionMessage {
            role: GPTRole::Assistant,
            content: format!("{}", message.response)
          }
        );
      }
    },
    Err(err) => warn!("Could not load previous messages: {}", err)
  };
  messages.push(ChatCompletionMessage { role: GPTRole::User, content: parsed_content.clone() });

  let request = ChatCompletionRequest {
    model: oai.default_model.clone(),
    messages,
    temperature: Some(0.5),
    top_p: None,
    n: None,
    max_tokens: Some(oai.max_tokens),
    presence_penalty: Some(0.6),
    frequency_penalty: Some(0.0),
    user: Some(msg.author.name.clone())
  };

  // Get the thread channel ID
  let thread_name = generate_thread_name(oai, &parsed_content, 99).await;
  let response_channel = match msg.channel_id.create_private_thread(&ctx.http, |thread| {
    thread.name(thread_name).kind(ChannelType::PublicThread)
  }).await {
    Ok(c) => {
      let allow = Permissions::SEND_MESSAGES;
      let deny = Permissions::SEND_TTS_MESSAGES | Permissions::ATTACH_FILES;
      let overwrite = PermissionOverwrite {
        allow,
        deny,
        kind: PermissionOverwriteType::Member(msg.author.id),
      };
      let _ = c.create_permission(&ctx.http, &overwrite).await;
      c.id
    }
    Err(_) => {
      channel_id
    }
  };

  let typing = response_channel.start_typing(&ctx.http).unwrap();

  // Get the OAI response and store message/response into the database
  let response = match oai.chat_completion(request).await {
    Ok(r) => {
      trace!("Processing response received from OpenAI");
      if !r.choices.is_empty() {
        let res = r.choices[0].message.content.clone();
        if let Err(err) = QueryMessage::insert(QueryMessage {
          id: r.id,
          guild_id: guild_id.0 as i64,
          channel_id: response_channel.0 as i64,
          user_id: author_id.0 as i64,
          created: r.created,
          model: serde_json::to_string(&r.model).unwrap(),
          request: parsed_content,
          response: res.clone(),
          request_tags: vec![],
          response_tags: vec![],
        }) {
          warn!("{}", err);
        }
        res
      } else {
        warn!("No choices received in the response from OpenAI");
        "No reply received".to_string()
      }
    }
    Err(err) => {
      error!("Could not get response from OpenAI: {}", err.message);
      "There was an error processing your message. Please try again later.".to_string()
    }
  };
  trace!("Writing response: \"{}\"", response);

  typing.stop();
  if let Err(why) = response_channel.say(&ctx.http, response).await {
    error!("Cannot send message: {}", why);
  }

  // match msg.channel_id.create_public_thread(&ctx.http, msg.id, |thread| {
  //     thread.name(truncate(&parsed_content, 99)).kind(ChannelType::PublicThread)
  // }).await {
  //   Ok(c) => {
  //     if let Err(why) = c.say(&ctx.http, response).await {
  //       error!("Cannot send message: {}", why);
  //     }
  //   }
  //   Err(_) => {
  //     if let Err(why) = channel_id.say(&ctx.http, response).await {
  //       error!("Cannot send message: {}", why);
  //     }
  //   }
  // };
}

async fn generate_thread_name(oai: &OAI, s: &str, max_chars: usize) -> String {
  let message = ChatCompletionMessage {
    role: GPTRole::User,
    content: format!("---\n{}\n---\nSummarize the message above into a concise Discord thread title", s)
  };
  let request = ChatCompletionRequest {
    model: oai.default_model.clone(),
    messages: vec![message],
    temperature: Some(0.5),
    top_p: None,
    n: None,
    max_tokens: Some(oai.max_tokens),
    presence_penalty: Some(0.6),
    frequency_penalty: Some(0.0),
    user: None
  };
  // Truncate the response to the max number of characters
  let mut response = match s.char_indices().nth(max_chars) {
    None => s,
    Some((idx, _)) => &s[..idx]
  }.to_string();
  // Set the response to the OAI response
  match oai.chat_completion(request).await {
    Ok(r) => {
      if !r.choices.is_empty() {
        response = r.choices[0].message.content.clone();
      } else {
        warn!("No choices received in the response from OpenAI");
      }
    }
    Err(err) => {
      error!("Could not get response from OpenAI: {}", err.message);
    }
  };
  return response;
}