//! ## Demo
//!
//! `Demo` shows how to use tui-realm in a real case

use std::time::Duration;

use tui_realm_stdlib::Input;
use tuirealm::command::{Cmd, CmdResult, Direction, Position};
use tuirealm::event::KeyModifiers;
use tuirealm::props::{
    Alignment, AttrValue, Attribute, BorderType, Borders, Color, InputType, Style,
};
use tuirealm::terminal::{CrosstermTerminalAdapter, TerminalBridge};
use tuirealm::{
    application::PollStrategy,
    event::{Key, KeyEvent},
    Application, Component, Event, EventListenerCfg, MockComponent, NoUserEvent, State, StateValue,
    Update,
};
// tui
use tuirealm::ratatui::layout::{Constraint, Direction as LayoutDirection, Layout};

#[derive(Debug, PartialEq)]
pub enum Msg {
    AppClose,
    ColorBlur,
    EmailBlur,
    NumberBlur,
    PasswordBlur,
    PhoneBlur,
    TextBlur,
    None,
}

// Let's define the component ids for our application
#[derive(Debug, Eq, PartialEq, Clone, Hash)]
pub enum Id {
    Color,
    Email,
    Number,
    Password,
    Phone,
    Text,
}

struct Model {
    app: Application<Id, Msg, NoUserEvent>,
    quit: bool,   // Becomes true when the user presses <ESC>
    redraw: bool, // Tells whether to refresh the UI; performance optimization
}

impl Default for Model {
    fn default() -> Self {
        // Setup app
        let mut app: Application<Id, Msg, NoUserEvent> = Application::init(
            EventListenerCfg::default().crossterm_input_listener(Duration::from_millis(10), 10),
        );
        assert!(app
            .mount(Id::Text, Box::new(InputText::default()), vec![])
            .is_ok());
        assert!(app
            .mount(Id::Email, Box::new(InputEmail::default()), vec![])
            .is_ok());
        assert!(app
            .mount(Id::Number, Box::new(InputNumber::default()), vec![])
            .is_ok());
        assert!(app
            .mount(Id::Password, Box::new(InputPassword::default()), vec![])
            .is_ok());
        assert!(app
            .mount(Id::Phone, Box::new(InputPhone::default()), vec![])
            .is_ok());
        assert!(app
            .mount(Id::Color, Box::new(InputColor::default()), vec![])
            .is_ok());
        // We need to give focus to input then
        assert!(app.active(&Id::Text).is_ok());
        Self {
            quit: false,
            redraw: true,
            app,
        }
    }
}

impl Model {
    fn view(&mut self, terminal: &mut TerminalBridge<CrosstermTerminalAdapter>) {
        let _ = terminal.raw_mut().draw(|f| {
            // Prepare chunks
            let chunks = Layout::default()
                .direction(LayoutDirection::Vertical)
                .margin(1)
                .constraints(
                    [
                        Constraint::Length(3), // Text
                        Constraint::Length(3), // Email
                        Constraint::Length(3), // Number
                        Constraint::Length(3), // Password
                        Constraint::Length(3), // Phone
                        Constraint::Length(3), // Color
                        Constraint::Length(1),
                    ]
                    .as_ref(),
                )
                .split(f.area());
            self.app.view(&Id::Text, f, chunks[0]);
            self.app.view(&Id::Email, f, chunks[1]);
            self.app.view(&Id::Number, f, chunks[2]);
            self.app.view(&Id::Password, f, chunks[3]);
            self.app.view(&Id::Phone, f, chunks[4]);
            self.app.view(&Id::Color, f, chunks[5]);
        });
    }
}

fn main() {
    let mut model = Model::default();
    let mut terminal = TerminalBridge::init_crossterm().expect("Cannot create terminal bridge");
    let _ = terminal.enable_raw_mode();
    let _ = terminal.enter_alternate_screen();
    // Now we use the Model struct to keep track of some states

    // let's loop until quit is true
    while !model.quit {
        // Tick
        if let Ok(messages) = model.app.tick(PollStrategy::Once) {
            for msg in messages.into_iter() {
                let mut msg = Some(msg);
                while msg.is_some() {
                    msg = model.update(msg);
                }
            }
        }
        // Redraw
        if model.redraw {
            model.view(&mut terminal);
            model.redraw = false;
        }
    }
    // Terminate terminal
    let _ = terminal.leave_alternate_screen();
    let _ = terminal.disable_raw_mode();
    let _ = terminal.clear_screen();
}

impl Update<Msg> for Model {
    fn update(&mut self, msg: Option<Msg>) -> Option<Msg> {
        self.redraw = true;
        match msg.unwrap_or(Msg::None) {
            Msg::AppClose => {
                self.quit = true;
                None
            }
            Msg::TextBlur => {
                assert!(self.app.active(&Id::Email).is_ok());
                None
            }
            Msg::EmailBlur => {
                assert!(self.app.active(&Id::Number).is_ok());
                None
            }
            Msg::NumberBlur => {
                assert!(self.app.active(&Id::Password).is_ok());
                None
            }
            Msg::PasswordBlur => {
                assert!(self.app.active(&Id::Phone).is_ok());
                None
            }
            Msg::PhoneBlur => {
                assert!(self.app.active(&Id::Color).is_ok());
                None
            }
            Msg::ColorBlur => {
                assert!(self.app.active(&Id::Text).is_ok());
                None
            }
            Msg::None => None,
        }
    }
}

// -- components

#[derive(MockComponent)]
struct InputText {
    component: Input,
}

impl Default for InputText {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::LightYellow),
                )
                .foreground(Color::LightYellow)
                .input_type(InputType::Text)
                .title("Username", Alignment::Left)
                .value("veeso")
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputText {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => self.perform(Cmd::Type(ch)),
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::TextBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}

#[derive(MockComponent)]
struct InputEmail {
    component: Input,
}

impl Default for InputEmail {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::LightCyan),
                )
                .foreground(Color::LightCyan)
                .input_type(InputType::Email)
                .title("Email", Alignment::Left)
                .placeholder(
                    "test@example.com",
                    Style::default().fg(Color::Rgb(120, 120, 120)),
                )
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputEmail {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => self.perform(Cmd::Type(ch)),
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::EmailBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}

#[derive(MockComponent)]
struct InputNumber {
    component: Input,
}

impl Default for InputNumber {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::LightGreen),
                )
                .foreground(Color::LightGreen)
                .input_type(InputType::UnsignedInteger)
                .input_len(2)
                .title("What's your age", Alignment::Left)
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputNumber {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => self.perform(Cmd::Type(ch)),
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::NumberBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}

#[derive(MockComponent)]
struct InputPassword {
    component: Input,
}

impl Default for InputPassword {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::LightMagenta),
                )
                .foreground(Color::LightMagenta)
                .input_type(InputType::Password('●'))
                .title("Password", Alignment::Left)
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputPassword {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => self.perform(Cmd::Type(ch)),
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::PasswordBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}

#[derive(MockComponent)]
struct InputPhone {
    component: Input,
}

impl Default for InputPhone {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::LightBlue),
                )
                .foreground(Color::LightBlue)
                .input_type(InputType::Telephone)
                .input_len(14)
                .title("Phone number", Alignment::Left)
                .placeholder(
                    "+39366123123",
                    Style::default().fg(Color::Rgb(120, 120, 120)),
                )
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputPhone {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => self.perform(Cmd::Type(ch)),
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::PhoneBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}

#[derive(MockComponent)]
struct InputColor {
    component: Input,
}

impl Default for InputColor {
    fn default() -> Self {
        Self {
            component: Input::default()
                .borders(
                    Borders::default()
                        .modifiers(BorderType::Rounded)
                        .color(Color::White),
                )
                .foreground(Color::White)
                .input_type(InputType::Color)
                .title("What's your favourite color", Alignment::Left)
                .invalid_style(Style::default().fg(Color::Red)),
        }
    }
}

impl Component<Msg, NoUserEvent> for InputColor {
    fn on(&mut self, ev: Event<NoUserEvent>) -> Option<Msg> {
        let _ = match ev {
            Event::Keyboard(KeyEvent {
                code: Key::Left, ..
            }) => self.perform(Cmd::Move(Direction::Left)),
            Event::Keyboard(KeyEvent {
                code: Key::Right, ..
            }) => self.perform(Cmd::Move(Direction::Right)),
            Event::Keyboard(KeyEvent {
                code: Key::Home, ..
            }) => self.perform(Cmd::GoTo(Position::Begin)),
            Event::Keyboard(KeyEvent { code: Key::End, .. }) => {
                self.perform(Cmd::GoTo(Position::End))
            }
            Event::Keyboard(KeyEvent {
                code: Key::Delete, ..
            }) => self.perform(Cmd::Cancel),
            Event::Keyboard(KeyEvent {
                code: Key::Backspace,
                ..
            }) => self.perform(Cmd::Delete),
            Event::Keyboard(KeyEvent {
                code: Key::Char(ch),
                modifiers: KeyModifiers::NONE,
            }) => {
                if let CmdResult::Changed(State::One(StateValue::String(color))) =
                    self.perform(Cmd::Type(ch))
                {
                    let color = tuirealm::utils::parser::parse_color(&color).unwrap();
                    self.attr(Attribute::Foreground, AttrValue::Color(color));
                    self.attr(
                        Attribute::Borders,
                        AttrValue::Borders(
                            Borders::default()
                                .modifiers(BorderType::Rounded)
                                .color(color),
                        ),
                    );
                }
                CmdResult::None
            }
            Event::Keyboard(KeyEvent { code: Key::Tab, .. }) => return Some(Msg::ColorBlur),
            Event::Keyboard(KeyEvent { code: Key::Esc, .. }) => return Some(Msg::AppClose),
            _ => CmdResult::None,
        };
        Some(Msg::None)
    }
}