use super::{Channel, Event, Screens, Setup};
use crate::{lcd::Lcd, screen::ClockChannel, Input};

enum Selection {
    Ch1,
    Ch2,
    Ch3,
    Setup,
}

pub struct Home {
    active: Selection,
}

impl Home {
    pub fn new() -> Self {
        Self {
            active: Selection::Ch1,
        }
    }

    pub fn input(&mut self, input: &Input, channels: [ClockChannel; 3]) -> Event {
        self.active = match self.active {
            Selection::Ch1 => match input {
                Input::Next => Selection::Ch2,
                Input::Previous => Selection::Setup,
                Input::Select => return Event::Screen(Screens::Channel(Channel::new(channels[0]))),
                Input::Back => Selection::Ch1,
            },
            Selection::Ch2 => match input {
                Input::Next => Selection::Ch3,
                Input::Previous => Selection::Ch1,
                Input::Select => return Event::Screen(Screens::Channel(Channel::new(channels[1]))),
                Input::Back => Selection::Ch2,
            },
            Selection::Ch3 => match input {
                Input::Next => Selection::Setup,
                Input::Previous => Selection::Ch2,
                Input::Select => return Event::Screen(Screens::Channel(Channel::new(channels[2]))),
                Input::Back => Selection::Ch3,
            },
            Selection::Setup => match input {
                Input::Next => Selection::Ch1,
                Input::Previous => Selection::Ch3,
                Input::Select => return Event::Screen(Screens::Setup(Setup::new())),
                Input::Back => Selection::Setup,
            },
        };

        Event::None
    }

    pub fn draw(&self, lcd: &mut Lcd, channels: [ClockChannel; 3]) {
        match &self.active {
            Selection::Ch1 => {
                lcd.print(0, 0, true, "CH1");
                channels[0].print(lcd, 0);
                lcd.print(0, 2, false, "CH2");
                channels[1].print(lcd, 2);
                lcd.print(0, 4, false, "CH3");
                channels[2].print(lcd, 4);
                lcd.print(33, 6, false, "SETUP");
            }
            Selection::Ch2 => {
                lcd.print(0, 0, false, "CH1");
                channels[0].print(lcd, 0);
                lcd.print(0, 2, true, "CH2");
                channels[1].print(lcd, 2);
                lcd.print(0, 4, false, "CH3");
                channels[2].print(lcd, 4);
                lcd.print(33, 6, false, "SETUP");
            }
            Selection::Ch3 => {
                lcd.print(0, 0, false, "CH1");
                channels[0].print(lcd, 0);
                lcd.print(0, 2, false, "CH2");
                channels[1].print(lcd, 2);
                lcd.print(0, 4, true, "CH3");
                channels[2].print(lcd, 4);
                lcd.print(33, 6, false, "SETUP");
            }
            Selection::Setup => {
                lcd.print(0, 0, false, "CH1");
                channels[0].print(lcd, 0);
                lcd.print(0, 2, false, "CH2");
                channels[1].print(lcd, 2);
                lcd.print(0, 4, false, "CH3");
                channels[2].print(lcd, 4);
                lcd.print(33, 6, true, "SETUP");
            }
        }
    }
}