use futures::stream::TryStreamExt;
use kkdisp::{
    component::{Plan, Widget},
    theme::Color,
    token::Token,
    view::{Event, Key},
    Action,
};
use misskey::{
    websocket::WebSocketClientBuilder, ClientExt, StreamingClientExt,
    WebSocketClient,
};

use crate::{AuthDetail, Message};
pub enum LoginFocus {
    Hostname,
    Token,
    OK,
}

impl LoginFocus {
    fn ok(&self) -> bool {
        match self {
            LoginFocus::OK => true,
            _ => false,
        }
    }
}

pub struct LoginPrompt {
    hostname: String,
    token: String,
    error: Option<String>,
    focus: LoginFocus,
    client: Option<AuthDetail>,
}

impl LoginPrompt {
    pub fn new() -> Self {
        Self {
            hostname: String::new(),
            token: String::new(),
            error: None,
            focus: LoginFocus::Hostname,
            client: None,
        }
    }

    pub fn plan(&self) -> Plan {
        Plan::start()
            .fill(vec![])
            .fixed(8, vec![Widget::new(100, self.tokens())])
            .fill(vec![])
    }

    fn backspace(&mut self) {
        match self.focus {
            LoginFocus::Hostname => {
                self.hostname.pop();
            }
            LoginFocus::Token => {
                self.token.pop();
            }
            LoginFocus::OK => {}
        }
    }
    pub fn query(&mut self) -> Option<AuthDetail> {
        self.client.take()
    }

    pub async fn attempt(&mut self) {
        let hostname =
            self.hostname.trim_end_matches('/').to_string();
        if hostname.len() == 0 {
            self.error = Some("empty hostname".into());
            self.focus = LoginFocus::Hostname;
            return;
        }
        let token = self.token.clone();
        if token.len() == 0 {
            self.error = Some("empty token".into());
            self.focus = LoginFocus::Token;
            return;
        }
        let auth = AuthDetail { hostname, token };

        match auth.normal().await {
            Ok(client) => {
                match client.recommended_users().try_next().await {
                    Ok(next) => {
                        eprintln!("next: {:#?}", next);
                        self.client = Some(auth);
                    }
                    Err(err) => {
                        self.error = Some(err.to_string());
                    }
                };
            }
            Err(err) => {
                self.error = Some(err.to_string());
            }
        };
    }

    fn down(&mut self) {
        self.focus = match self.focus {
            LoginFocus::Hostname => LoginFocus::Token,
            LoginFocus::Token => LoginFocus::OK,
            LoginFocus::OK => LoginFocus::Hostname,
        };
    }

    pub async fn update(
        &mut self,
        event: Event<Message>,
    ) -> Result<Action, anyhow::Error> {
        match event {
            Event::Link(lnk) => {
                if lnk == "ok" {
                    self.attempt().await;
                    Ok(Action::ReplaceAll(vec![self.plan()]))
                } else if lnk == "token" {
                    self.focus = LoginFocus::Token;
                    Ok(Action::ReplaceAll(vec![self.plan()]))
                } else if lnk == "hostname" {
                    self.focus = LoginFocus::Hostname;
                    Ok(Action::ReplaceAll(vec![self.plan()]))
                } else {
                    Ok(Action::Nothing)
                }
            }
            Event::Input(input) => {
                match input {
                    Key::Return => match self.focus {
                        LoginFocus::Hostname => {
                            self.focus = LoginFocus::Token;
                        }
                        LoginFocus::Token => {
                            self.focus = LoginFocus::OK;
                        }
                        LoginFocus::OK => self.attempt().await,
                    },
                    Key::Backspace => self.backspace(),
                    Key::Tab => self.down(),
                    Key::Up => {
                        self.focus = match self.focus {
                            LoginFocus::Hostname => LoginFocus::OK,
                            LoginFocus::Token => LoginFocus::Hostname,
                            LoginFocus::OK => LoginFocus::Token,
                        };
                    }
                    Key::Down => self.down(),
                    Key::Char(c) => match self.focus {
                        LoginFocus::Hostname => self.hostname.push(c),
                        LoginFocus::Token => self.token.push(c),
                        LoginFocus::OK => {}
                    },
                    Key::Ctrl(c) => {
                        if c == 'u' || c == 'U' {
                            match self.focus {
                                LoginFocus::Hostname => {
                                    self.hostname = String::new();
                                }
                                LoginFocus::Token => {
                                    self.token = String::new()
                                }
                                LoginFocus::OK => {}
                            }
                        }
                    }
                    Key::Esc => {
                        self.focus = LoginFocus::OK;
                    }
                    _ => {
                        return Ok(Action::Nothing);
                    }
                };
                Ok(Action::ReplaceAll(vec![self.plan()]))
            }
            Event::Message(_) => todo!(),
        }
    }

    fn tokens(&self) -> Vec<Token> {
        const HOSTNAME_PROMPT: &str = "hostname: ";
        const TOKEN_PROMPT: &str = "token: ";
        let mut hostname = Token::text(self.hostname.clone());
        let mut token = Token::text(self.token.clone());
        let mut ok = Token::text("[ok]");
        match self.focus {
            LoginFocus::Hostname => {
                hostname = hostname.bg(Color::BLUE)
            }
            LoginFocus::Token => token = token.bg(Color::BLUE),
            LoginFocus::OK => ok = ok.bg(Color::BLUE),
        };
        vec![
            Token::text("kkx cfg")
                .bg(Color::BLUE)
                .fg(Color::WHITE)
                .centered(),
            Token::End,
            match &self.error {
                Some(e) => Token::text(e)
                    .fg(Color::RED)
                    .pad_percent(80)
                    .centered(),
                None => Token::End,
            },
            hostname
                .string(HOSTNAME_PROMPT)
                .link("hostname")
                .pad_percent(80)
                .centered(),
            token
                .string(TOKEN_PROMPT)
                .link("token")
                .pad_percent(80)
                .centered(),
            ok.link("ok").centered(),
        ]
    }
}