use chrono::{Utc, DateTime, NaiveTime};
use config::{Config, PrevPost, Secrets, CommunitiesVector};
use lemmy_api_common::{
    person::{Login, LoginResponse},
    post::{CreatePost, GetPosts, GetPostsResponse},
    sensitive::Sensitive,
};
use lemmy_db_schema::{
    ListingType, SortType,
};
use once_cell::sync::Lazy;
use reqwest::{blocking::Client, StatusCode};
use tui::{backend::{CrosstermBackend, Backend}, Terminal, widgets::{Block, Borders, Cell, Row, Table, Paragraph, Wrap}, layout::{Layout, Constraint, Direction, Alignment}, Frame, style::{Style, Modifier, Color}, text::{Span, Spans}};
use crossterm::{event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode}, execute, terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},};
use std::{thread::{sleep, self}, time::{self, Duration}, io, vec};

mod config;

pub static CLIENT: Lazy<Client> = Lazy::new(|| {
    let client = Client::builder()
        .timeout(time::Duration::from_secs(30))
        .connect_timeout(time::Duration::from_secs(30))
        .build()
        .expect("build client");
    client
});

struct Bot {
    secrets: Secrets,
    config: Config,
    post_history: Vec<PrevPost>,
    community_ids: CommunitiesVector,
    auth: Sensitive<String>,
    start_time: DateTime<Utc>,
}

impl Bot {
    pub(crate) fn new() -> Bot {
        Bot {
            secrets: Secrets::init(),
            config: Config::init(),
            post_history: PrevPost::load(),
            community_ids: CommunitiesVector::new(),
            auth: Sensitive::new("".to_string()),
            start_time: Utc::now(),
        }
    }

    pub(crate) fn login(&mut self) {
        let login_params = Login {
            username_or_email: self.secrets.lemmy.get_username(),
            password: self.secrets.lemmy.get_password(),
        };

        let res = CLIENT
            .post(self.config.instance.clone() + "/api/v3/user/login")
            .json(&login_params)
            .send()
            .unwrap();

        if res.status() == StatusCode::OK {
            let data: &LoginResponse = &res.json().unwrap();

            let jwt = data.jwt.clone().expect("JWT Token could not be acquired");
            self.auth = jwt;
        } else {
            println!("Error Code: {:?}", res.status());
            panic!("JWT Token could not be acquired");
        }
    }

    pub(crate) fn post(&mut self, post_data: CreatePost) {
        let res = CLIENT
            .post(self.config.instance.clone() + "/api/v3/post")
            .json(&post_data)
            .send()
            .unwrap();
    }

    pub(crate) fn run_once(&mut self, mut prev_time: NaiveTime) {
        self.start_time = Utc::now();

        if self.start_time.time() - prev_time > chrono::Duration::seconds(6) { // Prod should use hours, add command line switch later and read duration from config
            prev_time = self.start_time.time();
            self.config.load();
            self.community_ids.load(&self.auth, &self.config.instance);
        }

        // Start the polling process
        // Get all feed URLs (use cache)
        let post_queue: Vec<CreatePost> = self.config.check_feeds(&mut self.post_history, &self.community_ids, &self.auth);

        post_queue.iter().for_each(|post| {
            println!("Posting: {}", post.name);
            self.post(post.clone());
        });
    }

    pub(crate) fn idle(&self) {
        while Utc::now().time() - self.start_time.time() < chrono::Duration::seconds(60) {
            sleep(time::Duration::from_secs(10));
        }
    } 
}

fn list_posts(auth: &Sensitive<String>, base: String) -> GetPostsResponse {
    let params = GetPosts {
        type_: Some(ListingType::Local),
        sort: Some(SortType::New),
        auth: Some(auth.clone()),
        ..Default::default()
    };

    let res = CLIENT
        .get(base + "/api/v3/post/list")
        .query(&params)
        .send()
        .unwrap()
        .text()
        .unwrap();

    return serde_json::from_str(&res).unwrap();
}

fn run_bot(mut terminal: Terminal<CrosstermBackend<&io::Stdout>>) {
        // Get all needed auth tokens at the start
        let mut old = Utc::now().time();
        let mut this = Bot::new();
        this.login();
        this.community_ids.load(&this.auth, &this.config.instance);
    
        // Enter a loop (not for debugging)
        loop {
            this.run_once(old);

            // Update UI    
            terminal.draw(|f| {
                ui(f, &this);
            }).unwrap();
        
            thread::sleep(Duration::from_secs(5));
        
            disable_raw_mode().unwrap();
            execute!(
                terminal.backend_mut(),
                LeaveAlternateScreen,
                DisableMouseCapture
            ).unwrap();
            terminal.show_cursor().unwrap();

            this.idle();
       }
}

fn ui<B: Backend>(f: &mut Frame<B>, state: &Bot) {
    let chunks = Layout::default()
        .direction(Direction::Vertical)
        .margin(1)
        .constraints(
            [
                Constraint::Percentage(15),
                Constraint::Percentage(90),
            ].as_ref()
        )
        .split(f.size());
    
    // Account Infos

    let account_info = vec![
        Row::new(vec![
            Cell::from(format!("Lemmy Username: {} |", state.secrets.lemmy.username)),
            Cell::from(format!("Lemmy Instance: {} |", state.config.instance))
        ])
    ];


    let block = Table::new(account_info)
        .block(Block::default().title("Account info").borders(Borders::ALL))
        .widths(&[
            Constraint::Percentage(15),
            Constraint::Percentage(20),
            Constraint::Percentage(20),
            Constraint::Percentage(20),
            Constraint::Percentage(20),
        ]);
    f.render_widget(block, chunks[0]);


    // Post Table
    
    let selected_style = Style::default().add_modifier(Modifier::REVERSED);
    let normal_style = Style::default().bg(Color::Blue);
    let header_cells = ["Series", "Community", "Reddit", "Discord", "Last Post"]
        .iter()
        .map(|h| Cell::from(*h).style(Style::default().fg(Color::Red)));
    let header = Row::new(header_cells)
        .style(normal_style)
        .height(1)
        .bottom_margin(1);
    let rows = state.post_history.iter().map(|post| {
        let config = &state.config.feeds[post.id];
        Row::new([Cell::from(post.title.clone()), Cell::from(format!("{}", config.communities.chapter)), Cell::from(format!("{}", config.reddit.enabled as u8)), Cell::from("0"), Cell::from(post.last_post_url.clone())]).height(1 as u16).bottom_margin(1)
    });

    let t = Table::new(rows)
        .header(header)
        .block(Block::default().borders(Borders::ALL).title("Table"))
        .highlight_style(selected_style)
        .highlight_symbol(">> ")
        .widths(&[
            Constraint::Percentage(30),
            Constraint::Percentage(10),
            Constraint::Percentage(5),
            Constraint::Percentage(5),
            Constraint::Percentage(50),
        ]);
    f.render_widget(t, chunks[1]);
}

fn main() -> Result<(), io::Error> {
    let stdout = io::stdout();
    let backend = CrosstermBackend::new(&stdout);
    let terminal = Terminal::new(backend)?;

    run_bot(terminal);
    Ok(())
}