use crate::db;
use crate::errors::Error;
use html_escape::encode_text;
use markov::Chain;
use mystem::Gender::Feminine;
use mystem::MyStem;
use mystem::Tense::{Inpresent, Past};
use rand::seq::SliceRandom;
use rand::Rng;
use regex::Regex;
use telegram_bot::prelude::*;
use telegram_bot::{Api, Message, ParseMode};

pub(crate) async fn here(api: Api, message: Message) -> Result<(), Error> {
    let members: Vec<telegram_bot::User> = db::get_members(message.chat.id()).unwrap();
    for u in &members {
        debug!("Found user {:?} in chat {}", u, message.chat.id());
    }
    let mut msg = "<b>I summon you</b>, ".to_string();
    for user in members {
        let mention = match user.username {
            Some(username) => format!("@{}", username),
            _ => format!(
                "<a href=\"tg://user?id={}\">{}</a>",
                encode_text(&user.id.to_string()),
                encode_text(&user.first_name)
            ),
        };
        msg = format!("{} {}", msg, mention);
    }

    match api
        .send(message.text_reply(msg).parse_mode(ParseMode::Html))
        .await
    {
        Ok(_) => debug!("/here command sent to {}", message.chat.id()),
        Err(_) => warn!("/here command sent failed to {}", message.chat.id()),
    }
    //api.send(message.chat.text("Text to message chat")).await?;
    //api.send(message.from.text("Private text")).await?;
    Ok(())
}

pub(crate) async fn top(api: Api, message: Message) -> Result<(), Error> {
    let top = db::get_top(&message).await?;
    let mut msg = "<b>Your top using words:</b>\n<pre>".to_string();
    let mut counter = 1;
    for word in top.iter() {
        msg = format!(
            "{} <b>{}</b> {} - {}\n",
            msg, counter, word.word, word.count
        );
        counter += 1;
    }
    msg = format!("{}{}", msg, "</pre>");
    match api
        .send(message.text_reply(msg).parse_mode(ParseMode::Html))
        .await
    {
        Ok(_) => debug!("/top command sent to {}", message.chat.id()),
        Err(_) => warn!("/top command sent failed to {}", message.chat.id()),
    }
    //api.send(message.chat.text("Text to message chat")).await?;
    //api.send(message.from.text("Private text")).await?;
    Ok(())
}

pub(crate) async fn markov_all(api: Api, message: Message) -> Result<(), Error> {
    let messages = db::get_messages_random_all().await?;
    let mut chain = Chain::new();
    chain.feed(messages);
    let mut sentences = chain.generate();
    let mut msg = String::new();
    for _ in 1..rand::thread_rng().gen_range(2, 10) {
        msg = format!("{} {}", msg, sentences.pop().unwrap());
    }
    match api
        .send(message.text_reply(msg.trim()).parse_mode(ParseMode::Html))
        .await
    {
        Ok(_) => debug!("/markov_all command sent to {}", message.chat.id()),
        Err(_) => warn!("/markov_all command sent failed to {}", message.chat.id()),
    }
    //api.send(message.chat.text("Text to message chat")).await?;
    //api.send(message.from.text("Private text")).await?;
    Ok(())
}

pub(crate) async fn markov(api: Api, message: Message) -> Result<(), Error> {
    let messages = db::get_messages_random_group(&message).await?;
    let mut chain = Chain::new();
    chain.feed(messages);
    let mut sentences = chain.generate();
    let mut msg = String::new();
    for _ in 1..rand::thread_rng().gen_range(2, 10) {
        msg = format!("{} {}", msg, sentences.pop().unwrap());
    }
    match api
        .send(message.text_reply(msg.trim()).parse_mode(ParseMode::Html))
        .await
    {
        Ok(_) => debug!("/markov command sent to {}", message.chat.id()),
        Err(_) => warn!("/markov command sent failed to {}", message.chat.id()),
    }
    //api.send(message.chat.text("Text to message chat")).await?;
    //api.send(message.from.text("Private text")).await?;
    Ok(())
}

pub(crate) async fn omedeto(api: Api, message: Message, mystem: &mut MyStem) -> Result<(), Error> {
    let all_msg = db::get_messages_user_all(&message).await?;
    let re = Regex::new(r"^[яЯ] [а-яА-Я]+(-[а-яА-Я]+(_[а-яА-Я]+)*)*$").unwrap();
    let mut nouns: Vec<String> = all_msg
        .clone()
        .into_iter()
        .filter(|m| re.is_match(m))
        .map(|m| m.split(' ').map(|s| s.to_string()).collect::<Vec<String>>()[1].clone())
        .filter(|m| {
            let stem = mystem.stemming(m.clone()).unwrap_or_default();
            if stem.is_empty() {
                false
            } else if stem[0].lex.is_empty() {
                false
            } else {
                match stem[0].lex[0].grammem.part_of_speech {
                    mystem::PartOfSpeech::Noun => true,
                    _ => false,
                }
            }
        })
        .collect();
    nouns.sort();
    nouns.dedup();
    nouns.shuffle(&mut rand::thread_rng());

    let mut verbs_p: Vec<String> = all_msg
        .clone()
        .into_iter()
        .filter(|m| re.is_match(m))
        .map(|m| m.split(' ').map(|s| s.to_string()).collect::<Vec<String>>()[1].clone())
        .filter(|m| {
            let stem = mystem.stemming(m.clone()).unwrap_or_default();
            if stem.is_empty() {
                false
            } else if stem[0].lex.is_empty() {
                false
            } else {
                match stem[0].lex[0].grammem.part_of_speech {
                    mystem::PartOfSpeech::Verb => stem[0].lex[0]
                        .grammem
                        .facts
                        .contains(&mystem::Fact::Tense(Past)),
                    _ => false,
                }
            }
        })
        .collect();
    verbs_p.sort();
    verbs_p.dedup();
    verbs_p.shuffle(&mut rand::thread_rng());

    let mut verbs_i: Vec<String> = all_msg
        .clone()
        .into_iter()
        .filter(|m| re.is_match(m))
        .map(|m| m.split(' ').map(|s| s.to_string()).collect::<Vec<String>>()[1].clone())
        .filter(|m| {
            let stem = mystem.stemming(m.clone()).unwrap_or_default();
            if stem.is_empty() {
                false
            } else if stem[0].lex.is_empty() {
                false
            } else {
                match stem[0].lex[0].grammem.part_of_speech {
                    mystem::PartOfSpeech::Verb => stem[0].lex[0]
                        .grammem
                        .facts
                        .contains(&mystem::Fact::Tense(Inpresent)),
                    _ => false,
                }
            }
        })
        .collect();
    verbs_i.sort();
    verbs_i.dedup();
    verbs_i.shuffle(&mut rand::thread_rng());

    if nouns.is_empty() {
        nouns.push(message.from.first_name.to_string());
    }
    let start: Vec<String> = vec![
        "С новыйм годом.".into(),
        "С НГ тебя".into(),
        "Поздравляю".into(),
        "Поздравляю с НГ".into(),
    ];
    //debug!("Nouns: {:#?}", nouns);
    //debug!("Verbs: {:#?}", verbs);

    let fem = {
        let z = mystem
            .stemming(message.from.first_name.to_string())
            .unwrap();

        if z.is_empty() {
            false
        } else if z[0].lex.is_empty() {
            false
        } else {
            if z[0].lex[0]
                .grammem
                .facts
                .contains(&mystem::Fact::Gender(Feminine))
            {
                true
            } else {
                false
            }
        }
    };
    let result = format!(
        "{} {} известн{} как {}, {}, а так же конечно {}. В прошедшем году ты часто давал{} нам знать, что ты {}, {} и {}. Не редко ты говорил{} я {}, я {} или даже я {}. =*",
        start.choose(&mut rand::thread_rng()).unwrap(),
        message.from.first_name.to_string(),
        {if fem {"ая"} else {"ый"}},
        nouns.pop().unwrap_or("=(".to_string()),
        nouns.pop().unwrap_or("=(".to_string()),
        nouns.pop().unwrap_or("=(".to_string()),
        {if fem {"а"} else {""}},
        verbs_p.pop().unwrap_or("=(".to_string()),
        verbs_p.pop().unwrap_or("=(".to_string()),
        verbs_p.pop().unwrap_or("=(".to_string()),
        {if fem {"а"} else {""}},
        verbs_i.pop().unwrap_or("=(".to_string()),
        verbs_i.pop().unwrap_or("=(".to_string()),
        verbs_i.pop().unwrap_or("=(".to_string()),

    );
    debug!("{:?}", result);
    match api
        .send(
            message
                .text_reply(result.trim())
                .parse_mode(ParseMode::Html),
        )
        .await
    {
        Ok(_) => debug!("/omedeto command sent to {}", message.chat.id()),
        Err(_) => warn!("/omedeto command sent failed to {}", message.chat.id()),
    }

    // '^я [а-яА-Я]+(-[а-яА-Я]+(_[а-яА-Я]+)*)*$'
    Ok(())
}