import * as u from './utils.js';
import * as chat from './chat.js';
import * as tools from './tools.js';

const REMIND_LEN_MAX = 7500;
const REMIND_SINGLE_MSG_LEN_MAX = 1950;
const REMIND_TOOL_MSG_LEN_MAX = 1000;

interface RemindMsg extends chat.Msg {
  matchedKeywords: string
};

interface MsgBank {
  msgs: RemindMsg[]
}

export async function run( toolCall: tools.Call, msglog: chat.Msg[] ) : Promise<chat.Msg | null> {
  if( !toolCall.parameters )
    return null;

  if( msglog.length < 25 )
    return { timestamp: u.getTimestamp(), role: "tool", content: "no conversations with the specified keyword(s) were found" };

  let args = toolCall.parameters.keywords;
  if( !args || !args.length )
    return null;

  console.log( "searching conversation..." );
  let msglogs = getMessages( msglog, args );
  let totalconv = msglogs.length;
  msglogs = truncateMsgBanks( msglogs );

  let str = "the current time is " + u.getTimestamp();
  if( msglogs.length > 0 ) {
    str = "\nthe following are pieces of conversations that contain the keyword(s) you are looking for:\n**MESSAGES START**\n";
    str += JSON.stringify( msglogs );
    str += "\n**MESSAGES END**\n";
    str += "respond to the user's query after reading those messages. do not state to the user that no messages were found or that none seem relevant, instead summarize messages that seem most relevant.";
  }
  else {
    str += "\nno conversations found with the keyword(s) you are looking for.";
  }

  console.log( `\x1b[36mfound ${msglogs.length} (${totalconv}) matching conversation(s) len: ${str.length}...\x1b[0m` );
  return { timestamp: u.getTimestamp(), role: "tool", content: str };
}

export function checkBanks( msglogs: MsgBank[], msg: chat.Msg ) : boolean {
  if( !msg.content )
    return true;

  for( let i = 0; i < msglogs.length; ++i ) {
    let bank = msglogs[i];
    for( let j = 0; j < bank.msgs.length; ++j ) {
      if( bank.msgs[j].content == msg.content )
        return true;
      if( bank.msgs[j].timestamp == msg.timestamp && msg.content.startsWith( bank.msgs[j].content ) )
        return true;
      if( bank.msgs[j].timestamp == msg.timestamp && msg.timestamp != "TOO OLD" )
        return true;
    }
  }

  return false;
}

export function getMatchingKeywords( msg: chat.Msg, args: string[] ) : string {
  let fullStr = args.join( ' ' );
  let content = msg.content.toLowerCase();
  if( content.startsWith( fullStr ) )
    return 'all';

  let matched = 0;
  for( let arg of args ) {
    if( content.includes( arg ) )
      ++matched;
  }

  if( matched < 2 && args.length > 1 )
    return "0";

  return matched.toString();
}

function truncateRemindMsg( msg: RemindMsg ) : RemindMsg {
  if( msg.content.length > REMIND_SINGLE_MSG_LEN_MAX ) {
    msg.content = msg.content.slice( 0, REMIND_SINGLE_MSG_LEN_MAX );
    msg.content += " ...<MESSAGE TRUNCATED>"
  }
  if( msg.role == 'tool' && msg.content.length > REMIND_TOOL_MSG_LEN_MAX ) {
    msg.content = msg.content.slice( 0, REMIND_TOOL_MSG_LEN_MAX );
    msg.content += " ...<MESSAGE TRUNCATED>"
  }

  return msg;
}

export function getMessages( msglog: chat.Msg[], args: string[] ) : MsgBank[] {
  if( msglog.length < 25 ) return [];
  let ret: MsgBank[] = [];

  for( let i = msglog.length - 25; i > 0; --i ) {
    let msg = { ...msglog[i] };

    if( !msg.content || msg.role == 'tool' )
      continue;

    if( msg.timestamp === undefined )
      msg.timestamp = 'TOO OLD';

    if( checkBanks( ret, msg ) )
      continue;

    let msgbank: MsgBank = { msgs: [] };
    let matched = getMatchingKeywords( msg, args );
    if( !matched )
      continue;

    for( let i2 = -2; i2 <= 2; ++i2 ) {
      if( i2 + i < 0 ) continue;
      if( i2 + i > msglog.length ) break;

      let submsg: RemindMsg = { ...msglog[i + i2], matchedKeywords: matched };
      if( submsg.content === undefined || submsg.role === 'tool' )
        continue;
      if( submsg.timestamp === undefined )
        submsg.timestamp = 'TOO OLD';
      if( checkBanks( ret, submsg ) )
        continue;

      msgbank.msgs.push( truncateRemindMsg( submsg ) );
    }

    if( msgbank.msgs.length > 0 )
      ret.push( msgbank );

    i -= 2;
  }

  ret.sort( ( a, b ) => {
    if( b[0].matchedKeywords === "all" && a[0].matchedKeywords !== "all" )
      return -1;
    if( a[0].matchedKeywords === "all" && b[0].matchedKeywords !== "all" )
      return 1;

    return b[0].matchedKeywords - a[0].matchedKeywords;
  } );

  return ret;
}

export function truncateMsgBanks( msgs: MsgBank[] ) : MsgBank[] {
  let ret = msgs.slice( 0, 5 );
  let logsLen = REMIND_LEN_MAX + 1;
  while( logsLen > REMIND_LEN_MAX ) {
    logsLen = 0;
    for( let bank of ret ) {
      for( let msg of bank.msgs )
        logsLen += msg.content.length;
    }

    if( logsLen > REMIND_LEN_MAX )
      ret.pop();
  }

  return ret;
}